src/style.cpp

   1 #define __SP_STYLE_C__
   2
   3 /** @file
   4  * @brief SVG stylesheets implementation.
   5  */
   6 /* Authors:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *   Peter Moulder <pmoulder@mail.csse.monash.edu.au>
   9  *   bulia byak <buliabyak@users.sf.net>
  10  *
  11  * Copyright (C) 2001-2002 Lauris Kaplinski
  12  * Copyright (C) 2001 Ximian, Inc.
  13  * Copyright (C) 2005 Monash University
  14  *
  15  * Released under GNU GPL, read the file 'COPYING' for more information
  16  */
  17
  18 #ifdef HAVE_CONFIG_H
  19 # include "config.h"
  20 #endif
  21
  22 #include <cstring>
  23 #include <string>
  24
  25 #include "libcroco/cr-sel-eng.h"
  26 #include "xml/croco-node-iface.h"
  27
  28 #include "svg/svg.h"
  29 #include "svg/svg-color.h"
  30 #include "svg/svg-icc-color.h"
  31 #include "svg/svg-device-color.h"
  32
  33 #include "display/canvas-bpath.h"
  34 #include "attributes.h"
  35 #include "document.h"
  36 #include "extract-uri.h"
  37 #include "uri-references.h"
  38 #include "uri.h"
  39 #include "sp-paint-server.h"
  40 #include "streq.h"
  41 #include "strneq.h"
  42 #include "style.h"
  43 #include "svg/css-ostringstream.h"
  44 #include "xml/repr.h"
  45 #include "xml/simple-document.h"
  46 #include "unit-constants.h"
  47 #include "2geom/isnan.h"
  48 #include "macros.h"
  49 #include "preferences.h"
  50
  51 #include "sp-filter-reference.h"
  52
  53 #include <sigc++/functors/ptr_fun.h>
  54 #include <sigc++/adaptors/bind.h>
  55
  56 using Inkscape::CSSOStringStream;
  57 using std::vector;
  58
  59 #define BMAX 8192
  60
  61 class SPStyleEnum;
  62
  63 /*#########################
  64 ## FORWARD DECLARATIONS
  65 #########################*/
  66 static void sp_style_clear(SPStyle *style);
  67
  68 static void sp_style_merge_property(SPStyle *style, gint id, gchar const *val);
  69
  70 static void sp_style_merge_ipaint(SPStyle *style, SPIPaint *paint, SPIPaint const *parent);
  71 static void sp_style_merge_ifilter(SPStyle *style, SPIFilter const *parent);
  72 static void sp_style_read_dash(SPStyle *style, gchar const *str);
  73
  74 static SPTextStyle *sp_text_style_new(void);
  75 static void sp_text_style_clear(SPTextStyle *ts);
  76 static SPTextStyle *sp_text_style_unref(SPTextStyle *st);
  77 static SPTextStyle *sp_text_style_duplicate_unset(SPTextStyle *st);
  78 static guint sp_text_style_write(gchar *p, guint len, SPTextStyle const *st, guint flags = SP_STYLE_FLAG_IFSET);
  79 static void sp_style_privatize_text(SPStyle *style);
  80
  81 static void sp_style_read_ifloat(SPIFloat *val, gchar const *str);
  82 static void sp_style_read_iscale24(SPIScale24 *val, gchar const *str);
  83 static void sp_style_read_ienum(SPIEnum *val, gchar const *str, SPStyleEnum const *dict, bool can_explicitly_inherit);
  84 static void sp_style_read_istring(SPIString *val, gchar const *str);
  85 static void sp_style_read_ilength(SPILength *val, gchar const *str);
  86 static void sp_style_read_ilengthornormal(SPILengthOrNormal *val, gchar const *str);
  87 static void sp_style_read_itextdecoration(SPITextDecoration *val, gchar const *str);
  88 static void sp_style_read_icolor(SPIPaint *paint, gchar const *str, SPStyle *style, SPDocument *document);
  89 static void sp_style_read_ipaint(SPIPaint *paint, gchar const *str, SPStyle *style, SPDocument *document);
  90 static void sp_style_read_ifontsize(SPIFontSize *val, gchar const *str);
  91 static void sp_style_read_ibaselineshift(SPIBaselineShift *val, gchar const *str);
  92 static void sp_style_read_ifilter(gchar const *str, SPStyle *style, SPDocument *document);
  93
  94 static void sp_style_read_penum(SPIEnum *val, Inkscape::XML::Node *repr, gchar const *key, SPStyleEnum const *dict, bool can_explicitly_inherit);
  95 static void sp_style_read_plength(SPILength *val, Inkscape::XML::Node *repr, gchar const *key);
  96 static void sp_style_read_pfontsize(SPIFontSize *val, Inkscape::XML::Node *repr, gchar const *key);
  97 static void sp_style_read_pbaselineshift(SPIBaselineShift *val, Inkscape::XML::Node *repr, gchar const *key);
  98 static void sp_style_read_pfloat(SPIFloat *val, Inkscape::XML::Node *repr, gchar const *key);
  99
 100 static gint sp_style_write_ifloat(gchar *p, gint len, gchar const *key, SPIFloat const *val, SPIFloat const *base, guint flags);
 101 static gint sp_style_write_iscale24(gchar *p, gint len, gchar const *key, SPIScale24 const *val, SPIScale24 const *base, guint flags);
 102 static gint sp_style_write_ienum(gchar *p, gint len, gchar const *key, SPStyleEnum const *dict, SPIEnum const *val, SPIEnum const *base, guint flags);
 103 static gint sp_style_write_istring(gchar *p, gint len, gchar const *key, SPIString const *val, SPIString const *base, guint flags);
 104 static gint sp_style_write_ilength(gchar *p, gint len, gchar const *key, SPILength const *val, SPILength const *base, guint flags);
 105 static gint sp_style_write_ipaint(gchar *b, gint len, gchar const *key, SPIPaint const *paint, SPIPaint const *base, guint flags);
 106 static gint sp_style_write_ifontsize(gchar *p, gint len, gchar const *key, SPIFontSize const *val, SPIFontSize const *base, guint flags);
 107 static gint sp_style_write_ibaselineshift(gchar *p, gint len, gchar const *key, SPIBaselineShift const *val, SPIBaselineShift const *base, guint flags);
 108 static gint sp_style_write_ilengthornormal(gchar *p, gint const len, gchar const *const key, SPILengthOrNormal const *const val, SPILengthOrNormal const *const base, guint const flags);
 109 static gint sp_style_write_itextdecoration(gchar *p, gint const len, gchar const *const key, SPITextDecoration const *const val, SPITextDecoration const *const base, guint const flags);
 110 static gint sp_style_write_ifilter(gchar *b, gint len, gchar const *key, SPIFilter const *filter, SPIFilter const *base, guint flags);
 111
 112 static void sp_style_filter_clear(SPStyle *style);
 113
 114 #define SPS_READ_IENUM_IF_UNSET(v,s,d,i) if (!(v)->set) {sp_style_read_ienum((v), (s), (d), (i));}
 115 #define SPS_READ_PENUM_IF_UNSET(v,r,k,d,i) if (!(v)->set) {sp_style_read_penum((v), (r), (k), (d), (i));}
 116
 117 #define SPS_READ_ILENGTH_IF_UNSET(v,s) if (!(v)->set) {sp_style_read_ilength((v), (s));}
 118 #define SPS_READ_PLENGTH_IF_UNSET(v,r,k) if (!(v)->set) {sp_style_read_plength((v), (r), (k));}
 119
 120 #define SPS_READ_PFLOAT_IF_UNSET(v,r,k) if (!(v)->set) {sp_style_read_pfloat((v), (r), (k));}
 121
 122 #define SPS_READ_IFONTSIZE_IF_UNSET(v,s) if (!(v)->set) {sp_style_read_ifontsize((v), (s));}
 123 #define SPS_READ_PFONTSIZE_IF_UNSET(v,r,k) if (!(v)->set) {sp_style_read_pfontsize((v), (r), (k));}
 124
 125 #define SPS_READ_IBASELINE_SHIFT_IF_UNSET(v,s) if (!(v)->set) {sp_style_read_ibaselineshift((v), (s));}
 126 #define SPS_READ_PBASELINE_SHIFT_IF_UNSET(v,r,k) if (!(v)->set) {sp_style_read_pbaselineshift((v), (r), (k));}
 127
 128 static void sp_style_merge_from_object_stylesheet(SPStyle *, SPObject const *);
 129
 130 struct SPStyleEnum {
 131     gchar const *key;
 132     gint value;
 133 };
 134
 135 static SPStyleEnum const enum_fill_rule[] = {
 136     {"nonzero", SP_WIND_RULE_NONZERO},
 137     {"evenodd", SP_WIND_RULE_EVENODD},
 138     {NULL, -1}
 139 };
 140
 141 static SPStyleEnum const enum_stroke_linecap[] = {
 142     {"butt", SP_STROKE_LINECAP_BUTT},
 143     {"round", SP_STROKE_LINECAP_ROUND},
 144     {"square", SP_STROKE_LINECAP_SQUARE},
 145     {NULL, -1}
 146 };
 147
 148 static SPStyleEnum const enum_stroke_linejoin[] = {
 149     {"miter", SP_STROKE_LINEJOIN_MITER},
 150     {"round", SP_STROKE_LINEJOIN_ROUND},
 151     {"bevel", SP_STROKE_LINEJOIN_BEVEL},
 152     {NULL, -1}
 153 };
 154
 155 static SPStyleEnum const enum_font_style[] = {
 156     {"normal", SP_CSS_FONT_STYLE_NORMAL},
 157     {"italic", SP_CSS_FONT_STYLE_ITALIC},
 158     {"oblique", SP_CSS_FONT_STYLE_OBLIQUE},
 159     {NULL, -1}
 160 };
 161
 162 static SPStyleEnum const enum_font_size[] = {
 163     {"xx-small", SP_CSS_FONT_SIZE_XX_SMALL},
 164     {"x-small", SP_CSS_FONT_SIZE_X_SMALL},
 165     {"small", SP_CSS_FONT_SIZE_SMALL},
 166     {"medium", SP_CSS_FONT_SIZE_MEDIUM},
 167     {"large", SP_CSS_FONT_SIZE_LARGE},
 168     {"x-large", SP_CSS_FONT_SIZE_X_LARGE},
 169     {"xx-large", SP_CSS_FONT_SIZE_XX_LARGE},
 170     {"smaller", SP_CSS_FONT_SIZE_SMALLER},
 171     {"larger", SP_CSS_FONT_SIZE_LARGER},
 172     {NULL, -1}
 173 };
 174
 175 static SPStyleEnum const enum_font_variant[] = {
 176     {"normal", SP_CSS_FONT_VARIANT_NORMAL},
 177     {"small-caps", SP_CSS_FONT_VARIANT_SMALL_CAPS},
 178     {NULL, -1}
 179 };
 180
 181 static SPStyleEnum const enum_font_weight[] = {
 182     {"100", SP_CSS_FONT_WEIGHT_100},
 183     {"200", SP_CSS_FONT_WEIGHT_200},
 184     {"300", SP_CSS_FONT_WEIGHT_300},
 185     {"400", SP_CSS_FONT_WEIGHT_400},
 186     {"500", SP_CSS_FONT_WEIGHT_500},
 187     {"600", SP_CSS_FONT_WEIGHT_600},
 188     {"700", SP_CSS_FONT_WEIGHT_700},
 189     {"800", SP_CSS_FONT_WEIGHT_800},
 190     {"900", SP_CSS_FONT_WEIGHT_900},
 191     {"normal", SP_CSS_FONT_WEIGHT_NORMAL},
 192     {"bold", SP_CSS_FONT_WEIGHT_BOLD},
 193     {"lighter", SP_CSS_FONT_WEIGHT_LIGHTER},
 194     {"bolder", SP_CSS_FONT_WEIGHT_BOLDER},
 195     {NULL, -1}
 196 };
 197
 198 static SPStyleEnum const enum_font_stretch[] = {
 199     {"ultra-condensed", SP_CSS_FONT_STRETCH_ULTRA_CONDENSED},
 200     {"extra-condensed", SP_CSS_FONT_STRETCH_EXTRA_CONDENSED},
 201     {"condensed", SP_CSS_FONT_STRETCH_CONDENSED},
 202     {"semi-condensed", SP_CSS_FONT_STRETCH_SEMI_CONDENSED},
 203     {"normal", SP_CSS_FONT_STRETCH_NORMAL},
 204     {"semi-expanded", SP_CSS_FONT_STRETCH_SEMI_EXPANDED},
 205     {"expanded", SP_CSS_FONT_STRETCH_EXPANDED},
 206     {"extra-expanded", SP_CSS_FONT_STRETCH_EXTRA_EXPANDED},
 207     {"ultra-expanded", SP_CSS_FONT_STRETCH_ULTRA_EXPANDED},
 208     {"narrower", SP_CSS_FONT_STRETCH_NARROWER},
 209     {"wider", SP_CSS_FONT_STRETCH_WIDER},
 210     {NULL, -1}
 211 };
 212
 213 static SPStyleEnum const enum_text_align[] = {
 214     {"start", SP_CSS_TEXT_ALIGN_START},
 215     {"end", SP_CSS_TEXT_ALIGN_END},
 216     {"left", SP_CSS_TEXT_ALIGN_LEFT},
 217     {"right", SP_CSS_TEXT_ALIGN_RIGHT},
 218     {"center", SP_CSS_TEXT_ALIGN_CENTER},
 219     {"justify", SP_CSS_TEXT_ALIGN_JUSTIFY},
 220     {NULL, -1}
 221 };
 222
 223 static SPStyleEnum const enum_text_transform[] = {
 224     {"capitalize", SP_CSS_TEXT_TRANSFORM_CAPITALIZE},
 225     {"uppercase", SP_CSS_TEXT_TRANSFORM_UPPERCASE},
 226     {"lowercase", SP_CSS_TEXT_TRANSFORM_LOWERCASE},
 227     {"none", SP_CSS_TEXT_TRANSFORM_NONE},
 228     {NULL, -1}
 229 };
 230
 231 static SPStyleEnum const enum_text_anchor[] = {
 232     {"start", SP_CSS_TEXT_ANCHOR_START},
 233     {"middle", SP_CSS_TEXT_ANCHOR_MIDDLE},
 234     {"end", SP_CSS_TEXT_ANCHOR_END},
 235     {NULL, -1}
 236 };
 237
 238 static SPStyleEnum const enum_direction[] = {
 239     {"ltr", SP_CSS_DIRECTION_LTR},
 240     {"rtl", SP_CSS_DIRECTION_RTL},
 241     {NULL, -1}
 242 };
 243
 244 static SPStyleEnum const enum_block_progression[] = {
 245     {"tb", SP_CSS_BLOCK_PROGRESSION_TB},
 246     {"rl", SP_CSS_BLOCK_PROGRESSION_RL},
 247     {"lr", SP_CSS_BLOCK_PROGRESSION_LR},
 248     {NULL, -1}
 249 };
 250
 251 static SPStyleEnum const enum_writing_mode[] = {
 252     /* Note that using the same enumerator for lr as lr-tb means we write as lr-tb even if the
 253      * input file said lr.  We prefer writing lr-tb on the grounds that the spec says the initial
 254      * value is lr-tb rather than lr.
 255      *
 256      * ECMA scripts may be surprised to find tb-rl in DOM if they set the attribute to rl, so
 257      * sharing enumerators for different strings may be a bug (once we support ecma script).
 258      */
 259     {"lr-tb", SP_CSS_WRITING_MODE_LR_TB},
 260     {"rl-tb", SP_CSS_WRITING_MODE_RL_TB},
 261     {"tb-rl", SP_CSS_WRITING_MODE_TB_RL},
 262     {"lr", SP_CSS_WRITING_MODE_LR_TB},
 263     {"rl", SP_CSS_WRITING_MODE_RL_TB},
 264     {"tb", SP_CSS_WRITING_MODE_TB_RL},
 265     {NULL, -1}
 266 };
 267
 268 static SPStyleEnum const enum_baseline_shift[] = {
 269     {"baseline", SP_CSS_BASELINE_SHIFT_BASELINE},
 270     {"sub",      SP_CSS_BASELINE_SHIFT_SUB},
 271     {"super",    SP_CSS_BASELINE_SHIFT_SUPER},
 272     {NULL, -1}
 273 };
 274
 275 static SPStyleEnum const enum_visibility[] = {
 276     {"hidden", SP_CSS_VISIBILITY_HIDDEN},
 277     {"collapse", SP_CSS_VISIBILITY_COLLAPSE},
 278     {"visible", SP_CSS_VISIBILITY_VISIBLE},
 279     {NULL, -1}
 280 };
 281
 282 static SPStyleEnum const enum_overflow[] = {
 283     {"visible", SP_CSS_OVERFLOW_VISIBLE},
 284     {"hidden", SP_CSS_OVERFLOW_HIDDEN},
 285     {"scroll", SP_CSS_OVERFLOW_SCROLL},
 286     {"auto", SP_CSS_OVERFLOW_AUTO},
 287     {NULL, -1}
 288 };
 289
 290 static SPStyleEnum const enum_display[] = {
 291     {"none",      SP_CSS_DISPLAY_NONE},
 292     {"inline",    SP_CSS_DISPLAY_INLINE},
 293     {"block",     SP_CSS_DISPLAY_BLOCK},
 294     {"list-item", SP_CSS_DISPLAY_LIST_ITEM},
 295     {"run-in",    SP_CSS_DISPLAY_RUN_IN},
 296     {"compact",   SP_CSS_DISPLAY_COMPACT},
 297     {"marker",    SP_CSS_DISPLAY_MARKER},
 298     {"table",     SP_CSS_DISPLAY_TABLE},
 299     {"inline-table",  SP_CSS_DISPLAY_INLINE_TABLE},
 300     {"table-row-group",    SP_CSS_DISPLAY_TABLE_ROW_GROUP},
 301     {"table-header-group", SP_CSS_DISPLAY_TABLE_HEADER_GROUP},
 302     {"table-footer-group", SP_CSS_DISPLAY_TABLE_FOOTER_GROUP},
 303     {"table-row",     SP_CSS_DISPLAY_TABLE_ROW},
 304     {"table-column-group", SP_CSS_DISPLAY_TABLE_COLUMN_GROUP},
 305     {"table-column",  SP_CSS_DISPLAY_TABLE_COLUMN},
 306     {"table-cell",    SP_CSS_DISPLAY_TABLE_CELL},
 307     {"table-caption", SP_CSS_DISPLAY_TABLE_CAPTION},
 308     {NULL, -1}
 309 };
 310
 311 static SPStyleEnum const enum_shape_rendering[] = {
 312     {"auto", 0},
 313     {"optimizeSpeed", 0},
 314     {"crispEdges", 0},
 315     {"geometricPrecision", 0},
 316     {NULL, -1}
 317 };
 318
 319 static SPStyleEnum const enum_color_rendering[] = {
 320     {"auto", 0},
 321     {"optimizeSpeed", 0},
 322     {"optimizeQuality", 0},
 323     {NULL, -1}
 324 };
 325
 326 static SPStyleEnum const *const enum_image_rendering = enum_color_rendering;
 327
 328 static SPStyleEnum const enum_text_rendering[] = {
 329     {"auto", 0},
 330     {"optimizeSpeed", 0},
 331     {"optimizeLegibility", 0},
 332     {"geometricPrecision", 0},
 333     {NULL, -1}
 334 };
 335
 336 static SPStyleEnum const enum_enable_background[] = {
 337     {"accumulate", SP_CSS_BACKGROUND_ACCUMULATE},
 338     {"new", SP_CSS_BACKGROUND_NEW},
 339     {NULL, -1}
 340 };
 341
 342 /**
 343  * Release callback.
 344  */
 345 static void
 346 sp_style_object_release(SPObject *object, SPStyle *style)
 347 {
 348     (void)object; // TODO
 349     style->object = NULL;
 350 }
 351
 352 /**
 353  * Emit style modified signal on style's object if the filter changed.
 354  */
 355 static void
 356 sp_style_filter_ref_modified(SPObject *obj, guint flags, SPStyle *style)
 357 {
 358     (void)flags; // TODO
 359     SPFilter *filter=static_cast<SPFilter *>(obj);
 360     if (style->getFilter() == filter)
 361     {
 362         if (style->object) {
 363             style->object->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
 364         }
 365     }
 366 }
 367
 368 /**
 369  * Gets called when the filter is (re)attached to the style
 370  */
 371 static void
 372 sp_style_filter_ref_changed(SPObject *old_ref, SPObject *ref, SPStyle *style)
 373 {
 374     if (old_ref) {
 375         style->filter_modified_connection.disconnect();
 376     }
 377     if ( SP_IS_FILTER(ref))
 378     {
 379         style->filter_modified_connection =
 380            ref->connectModified(sigc::bind(sigc::ptr_fun(&sp_style_filter_ref_modified), style));
 381     }
 382
 383     sp_style_filter_ref_modified(ref, 0, style);
 384 }
 385
 386 /**
 387  * Emit style modified signal on style's object if server is style's fill
 388  * or stroke paint server.
 389  */
 390 static void
 391 sp_style_paint_server_ref_modified(SPObject *obj, guint flags, SPStyle *style)
 392 {
 393     (void)flags; // TODO
 394     SPPaintServer *server = static_cast<SPPaintServer *>(obj);
 395
 396     if ((style->fill.isPaintserver())
 397         && style->getFillPaintServer() == server)
 398     {
 399         if (style->object) {
 400             /** \todo
 401              * fixme: I do not know, whether it is optimal - we are
 402              * forcing reread of everything (Lauris)
 403              */
 404             /** \todo
 405              * fixme: We have to use object_modified flag, because parent
 406              * flag is only available downstreams.
 407              */
 408             style->object->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
 409         }
 410     } else if ((style->stroke.isPaintserver())
 411         && style->getStrokePaintServer() == server)
 412     {
 413         if (style->object) {
 414             /// \todo fixme:
 415             style->object->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
 416         }
 417     } else if (server) {
 418         g_assert_not_reached();
 419     }
 420 }
 421
 422 /**
 423  * Gets called when the paintserver is (re)attached to the style
 424  */
 425 static void
 426 sp_style_fill_paint_server_ref_changed(SPObject *old_ref, SPObject *ref, SPStyle *style)
 427 {
 428     if (old_ref) {
 429         style->fill_ps_modified_connection.disconnect();
 430     }
 431     if (SP_IS_PAINT_SERVER(ref)) {
 432         style->fill_ps_modified_connection =
 433            ref->connectModified(sigc::bind(sigc::ptr_fun(&sp_style_paint_server_ref_modified), style));
 434     }
 435
 436     sp_style_paint_server_ref_modified(ref, 0, style);
 437 }
 438
 439 /**
 440  * Gets called when the paintserver is (re)attached to the style
 441  */
 442 static void
 443 sp_style_stroke_paint_server_ref_changed(SPObject *old_ref, SPObject *ref, SPStyle *style)
 444 {
 445     if (old_ref) {
 446         style->stroke_ps_modified_connection.disconnect();
 447     }
 448     if (SP_IS_PAINT_SERVER(ref)) {
 449         style->stroke_ps_modified_connection =
 450           ref->connectModified(sigc::bind(sigc::ptr_fun(&sp_style_paint_server_ref_modified), style));
 451     }
 452
 453     sp_style_paint_server_ref_modified(ref, 0, style);
 454 }
 455
 456 /**
 457  * Returns a new SPStyle object with settings as per sp_style_clear().
 458  */
 459 SPStyle *
 460 sp_style_new(SPDocument *document)
 461 {
 462     SPStyle *const style = g_new0(SPStyle, 1);
 463
 464     style->refcount = 1;
 465     style->object = NULL;
 466     style->document = document;
 467     style->text = sp_text_style_new();
 468     style->text_private = TRUE;
 469
 470     sp_style_clear(style);
 471
 472     style->cloned = false;
 473
 474     new (&style->release_connection) sigc::connection();
 475     new (&style->filter_modified_connection) sigc::connection();
 476     new (&style->fill_ps_modified_connection) sigc::connection();
 477     new (&style->stroke_ps_modified_connection) sigc::connection();
 478
 479     return style;
 480 }
 481
 482
 483 /**
 484  * Creates a new SPStyle object, and attaches it to the specified SPObject.
 485  */
 486 SPStyle *
 487 sp_style_new_from_object(SPObject *object)
 488 {
 489     g_return_val_if_fail(object != NULL, NULL);
 490     g_return_val_if_fail(SP_IS_OBJECT(object), NULL);
 491
 492     SPStyle *style = sp_style_new(SP_OBJECT_DOCUMENT(object));
 493     style->object = object;
 494     style->release_connection = object->connectRelease(sigc::bind<1>(sigc::ptr_fun(&sp_style_object_release), style));
 495
 496     if (object && SP_OBJECT_IS_CLONED(object)) {
 497         style->cloned = true;
 498     }
 499
 500     return style;
 501 }
 502
 503
 504 /**
 505  * Increase refcount of style.
 506  */
 507 SPStyle *
 508 sp_style_ref(SPStyle *style)
 509 {
 510     g_return_val_if_fail(style != NULL, NULL);
 511     g_return_val_if_fail(style->refcount > 0, NULL);
 512
 513     style->refcount += 1;
 514
 515     return style;
 516 }
 517
 518
 519 /**
 520  * Decrease refcount of style with possible destruction.
 521  */
 522 SPStyle *
 523 sp_style_unref(SPStyle *style)
 524 {
 525     g_return_val_if_fail(style != NULL, NULL);
 526     g_return_val_if_fail(style->refcount > 0, NULL);
 527
 528     style->refcount -= 1;
 529
 530     if (style->refcount < 1) {
 531         style->release_connection.disconnect();
 532         style->release_connection.~connection();
 533         if (style->text) sp_text_style_unref(style->text);
 534
 535          if (style->fill.value.href) {
 536              style->fill_ps_modified_connection.disconnect();
 537              delete style->fill.value.href;
 538              style->fill.value.href = NULL;
 539          }
 540          if (style->stroke.value.href) {
 541              style->stroke_ps_modified_connection.disconnect();
 542              delete style->stroke.value.href;
 543              style->stroke.value.href = NULL;
 544          }
 545          if (style->filter.href) {
 546              style->filter_modified_connection.disconnect();
 547              delete style->filter.href;
 548              style->filter.href = NULL;
 549          }
 550
 551         style->filter_modified_connection.~connection();
 552         style->fill_ps_modified_connection.~connection();
 553         style->stroke_ps_modified_connection.~connection();
 554
 555         style->fill.clear();
 556         style->stroke.clear();
 557         sp_style_filter_clear(style);
 558
 559         g_free(style->stroke_dash.dash);
 560         g_free(style);
 561     }
 562
 563     return NULL;
 564 }
 565
 566 /**
 567  *  Reads the various style parameters for an object from repr.
 568  */
 569 static void
 570 sp_style_read(SPStyle *style, SPObject *object, Inkscape::XML::Node *repr)
 571 {
 572     g_assert(style != NULL);
 573     g_assert(repr != NULL);
 574     g_assert(!object || (SP_OBJECT_REPR(object) == repr));
 575
 576     sp_style_clear(style);
 577
 578     if (object && SP_OBJECT_IS_CLONED(object)) {
 579         style->cloned = true;
 580     }
 581
 582     /* 1. Style attribute */
 583     gchar const *val = repr->attribute("style");
 584     if (val != NULL) {
 585         sp_style_merge_from_style_string(style, val);
 586     }
 587
 588     if (object) {
 589         sp_style_merge_from_object_stylesheet(style, object);
 590     } else {
 591         /** \todo No stylesheet information. Find out under what circumstances
 592          * this occurs, and handle accordingly.  (If we really wanted to, we
 593          * could probably get stylesheets by going through repr->doc.)
 594          */
 595     }
 596
 597     /* 2. Presentation attributes */
 598     /* CSS2 */
 599     SPS_READ_PENUM_IF_UNSET(&style->visibility, repr, "visibility", enum_visibility, true);
 600     SPS_READ_PENUM_IF_UNSET(&style->display, repr, "display", enum_display, true);
 601     SPS_READ_PENUM_IF_UNSET(&style->overflow, repr, "overflow", enum_overflow, true);
 602     /* Font */
 603     SPS_READ_PFONTSIZE_IF_UNSET(&style->font_size, repr, "font-size");
 604     SPS_READ_PENUM_IF_UNSET(&style->font_style, repr, "font-style", enum_font_style, true);
 605     SPS_READ_PENUM_IF_UNSET(&style->font_variant, repr, "font-variant", enum_font_variant, true);
 606     SPS_READ_PENUM_IF_UNSET(&style->font_weight, repr, "font-weight", enum_font_weight, true);
 607     SPS_READ_PENUM_IF_UNSET(&style->font_stretch, repr, "font-stretch", enum_font_stretch, true);
 608     /* Text (css2 chapter 16) */
 609     SPS_READ_PLENGTH_IF_UNSET(&style->text_indent, repr, "text-indent");
 610     SPS_READ_PENUM_IF_UNSET(&style->text_align, repr, "text-align", enum_text_align, true);
 611     if (!style->text_decoration.set) {
 612         val = repr->attribute("text-decoration");
 613         if (val) {
 614             sp_style_read_itextdecoration(&style->text_decoration, val);
 615         }
 616     }
 617     if (!style->line_height.set) {
 618         val = repr->attribute("line-height");
 619         if (val) {
 620             sp_style_read_ilengthornormal(&style->line_height, val);
 621         }
 622     }
 623     if (!style->letter_spacing.set) {
 624         val = repr->attribute("letter-spacing");
 625         if (val) {
 626             sp_style_read_ilengthornormal(&style->letter_spacing, val);
 627         }
 628     }
 629     if (!style->word_spacing.set) {
 630         val = repr->attribute("word-spacing");
 631         if (val) {
 632             sp_style_read_ilengthornormal(&style->word_spacing, val);
 633         }
 634     }
 635     SPS_READ_PENUM_IF_UNSET(&style->text_transform, repr, "text-transform", enum_text_transform, true);
 636     SPS_READ_PENUM_IF_UNSET(&style->direction, repr, "direction", enum_direction, true);
 637     SPS_READ_PENUM_IF_UNSET(&style->block_progression, repr, "block_progression", enum_block_progression, true);
 638
 639     /* SVG */
 640     SPS_READ_PENUM_IF_UNSET(&style->writing_mode, repr, "writing-mode",
 641                             enum_writing_mode, true);
 642     SPS_READ_PENUM_IF_UNSET(&style->text_anchor, repr, "text-anchor",
 643                             enum_text_anchor, true);
 644     SPS_READ_PBASELINE_SHIFT_IF_UNSET(&style->baseline_shift, repr, "baseline-shift");
 645
 646     /* opacity */
 647     if (!style->opacity.set) {
 648         val = repr->attribute("opacity");
 649         if (val) {
 650             sp_style_read_iscale24(&style->opacity, val);
 651         }
 652     }
 653     /* color */
 654     if (!style->color.set) {
 655         val = repr->attribute("color");
 656         if (val) {
 657             sp_style_read_icolor(&style->color, val, style, ( object
 658                                                               ? SP_OBJECT_DOCUMENT(object)
 659                                                               : NULL ));
 660         }
 661     }
 662     /* fill */
 663     if (!style->fill.set) {
 664         val = repr->attribute("fill");
 665         if (val) {
 666             sp_style_read_ipaint(&style->fill, val, style, (object) ? SP_OBJECT_DOCUMENT(object) : NULL);
 667         }
 668     }
 669     /* fill-opacity */
 670     if (!style->fill_opacity.set) {
 671         val = repr->attribute("fill-opacity");
 672         if (val) {
 673             sp_style_read_iscale24(&style->fill_opacity, val);
 674         }
 675     }
 676     /* fill-rule */
 677     SPS_READ_PENUM_IF_UNSET(&style->fill_rule, repr, "fill-rule", enum_fill_rule, true);
 678     /* stroke */
 679     if (!style->stroke.set) {
 680         val = repr->attribute("stroke");
 681         if (val) {
 682             sp_style_read_ipaint(&style->stroke, val, style, (object) ? SP_OBJECT_DOCUMENT(object) : NULL);
 683         }
 684     }
 685     SPS_READ_PLENGTH_IF_UNSET(&style->stroke_width, repr, "stroke-width");
 686     SPS_READ_PENUM_IF_UNSET(&style->stroke_linecap, repr, "stroke-linecap", enum_stroke_linecap, true);
 687     SPS_READ_PENUM_IF_UNSET(&style->stroke_linejoin, repr, "stroke-linejoin", enum_stroke_linejoin, true);
 688     SPS_READ_PFLOAT_IF_UNSET(&style->stroke_miterlimit, repr, "stroke-miterlimit");
 689
 690     /* markers */
 691     if (!style->marker[SP_MARKER_LOC].set) {
 692         val = repr->attribute("marker");
 693         if (val) {
 694             sp_style_read_istring(&style->marker[SP_MARKER_LOC], val);
 695         }
 696     }
 697     if (!style->marker[SP_MARKER_LOC_START].set) {
 698         val = repr->attribute("marker-start");
 699         if (val) {
 700             sp_style_read_istring(&style->marker[SP_MARKER_LOC_START], val);
 701         }
 702     }
 703     if (!style->marker[SP_MARKER_LOC_MID].set) {
 704         val = repr->attribute("marker-mid");
 705         if (val) {
 706             sp_style_read_istring(&style->marker[SP_MARKER_LOC_MID], val);
 707         }
 708     }
 709     if (!style->marker[SP_MARKER_LOC_END].set) {
 710         val = repr->attribute("marker-end");
 711         if (val) {
 712             sp_style_read_istring(&style->marker[SP_MARKER_LOC_END], val);
 713         }
 714     }
 715
 716     /* stroke-opacity */
 717     if (!style->stroke_opacity.set) {
 718         val = repr->attribute("stroke-opacity");
 719         if (val) {
 720             sp_style_read_iscale24(&style->stroke_opacity, val);
 721         }
 722     }
 723     if (!style->stroke_dasharray_set) {
 724         val = repr->attribute("stroke-dasharray");
 725         if (val) {
 726             sp_style_read_dash(style, val);
 727         }
 728     }
 729
 730     if (!style->stroke_dashoffset_set) {
 731         val = repr->attribute("stroke-dashoffset");
 732         if (sp_svg_number_read_d(val, &style->stroke_dash.offset)) {
 733             style->stroke_dashoffset_set = TRUE;
 734         } else if (val && !strcmp(val, "inherit")) {
 735             style->stroke_dashoffset_set = TRUE;
 736             style->stroke_dashoffset_inherit = TRUE;
 737         } else {
 738             style->stroke_dashoffset_set = FALSE;
 739         }
 740     }
 741
 742     /* -inkscape-font-specification */
 743     if (!style->text_private || !style->text->font_specification.set) {
 744         val = repr->attribute("-inkscape-font-specification");
 745         if (val) {
 746             if (!style->text_private) sp_style_privatize_text(style);
 747             gchar *val_unquoted = attribute_unquote(val);
 748             sp_style_read_istring(&style->text->font_specification, val_unquoted);
 749             if (val_unquoted) g_free (val_unquoted);
 750         }
 751     }
 752
 753     /* font-family */
 754     if (!style->text_private || !style->text->font_family.set) {
 755         val = repr->attribute("font-family");
 756         if (val) {
 757             if (!style->text_private) sp_style_privatize_text(style);
 758             gchar *val_unquoted = attribute_unquote(val);
 759             sp_style_read_istring(&style->text->font_family, val_unquoted);
 760             if (val_unquoted) g_free (val_unquoted);
 761         }
 762     }
 763
 764     /* filter effects */
 765     if (!style->filter.set) {
 766         val = repr->attribute("filter");
 767         if (val) {
 768             sp_style_read_ifilter(val, style, (object) ? SP_OBJECT_DOCUMENT(object) : NULL);
 769         }
 770     }
 771     SPS_READ_PENUM_IF_UNSET(&style->enable_background, repr,
 772                             "enable-background", enum_enable_background, true);
 773
 774     /* 3. Merge from parent */
 775     if (object) {
 776         if (object->parent) {
 777             sp_style_merge_from_parent(style, SP_OBJECT_STYLE(object->parent));
 778         }
 779     } else {
 780         if (sp_repr_parent(repr)) {
 781             /// \todo fixme: This is not the prettiest thing (Lauris)
 782             SPStyle *parent = sp_style_new(NULL);
 783             sp_style_read(parent, NULL, sp_repr_parent(repr));
 784             sp_style_merge_from_parent(style, parent);
 785             sp_style_unref(parent);
 786         }
 787     }
 788 }
 789
 790
 791 /**
 792  * Read style properties from object's repr.
 793  *
 794  * 1. Reset existing object style
 795  * 2. Load current effective object style
 796  * 3. Load i attributes from immediate parent (which has to be up-to-date)
 797  */
 798 void
 799 sp_style_read_from_object(SPStyle *style, SPObject *object)
 800 {
 801     g_return_if_fail(style != NULL);
 802     g_return_if_fail(object != NULL);
 803     g_return_if_fail(SP_IS_OBJECT(object));
 804
 805     Inkscape::XML::Node *repr = SP_OBJECT_REPR(object);
 806     g_return_if_fail(repr != NULL);
 807
 808     sp_style_read(style, object, repr);
 809 }
 810
 811
 812 /**
 813  * Read style properties from preferences.
 814  * @param style The style to write to
 815  * @param path Preferences directory from which the style should be read
 816  */
 817 void
 818 sp_style_read_from_prefs(SPStyle *style, Glib::ustring const &path)
 819 {
 820     g_return_if_fail(style != NULL);
 821     g_return_if_fail(path != "");
 822
 823     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 824
 825     // not optimal: we reconstruct the node based on the prefs, then pass it to
 826     // sp_style_read for actual processing.
 827     Inkscape::XML::SimpleDocument *tempdoc = new Inkscape::XML::SimpleDocument;
 828     Inkscape::XML::Node *tempnode = tempdoc->createElement("temp");
 829
 830     std::vector<Inkscape::Preferences::Entry> attrs = prefs->getAllEntries(path);
 831     for (std::vector<Inkscape::Preferences::Entry>::iterator i = attrs.begin(); i != attrs.end(); ++i) {
 832         tempnode->setAttribute(i->getEntryName().data(), i->getString().data());
 833     }
 834
 835     sp_style_read(style, NULL, tempnode);
 836
 837     Inkscape::GC::release(tempnode);
 838     Inkscape::GC::release(tempdoc);
 839     delete tempdoc;
 840 }
 841
 842
 843
 844 /**
 845  *
 846  */
 847 static void
 848 sp_style_privatize_text(SPStyle *style)
 849 {
 850     SPTextStyle *text = style->text;
 851     style->text = sp_text_style_duplicate_unset(style->text);
 852     sp_text_style_unref(text);
 853     style->text_private = TRUE;
 854 }
 855
 856
 857 /**
 858  * Merge property into style.
 859  *
 860  * Should be called in order of highest to lowest precedence.
 861  * E.g. for a single style string, call from the last declaration to the first,
 862  * as CSS says that later declarations override earlier ones.
 863  *
 864  * \pre val != NULL.
 865  */
 866 static void
 867 sp_style_merge_property(SPStyle *style, gint id, gchar const *val)
 868 {
 869     g_return_if_fail(val != NULL);
 870
 871     switch (id) {
 872         case SP_PROP_INKSCAPE_FONT_SPEC:
 873             if (!style->text_private) sp_style_privatize_text(style);
 874             if (!style->text->font_specification.set) {
 875                 gchar *val_unquoted = attribute_unquote(val);
 876                 sp_style_read_istring(&style->text->font_specification, val_unquoted);
 877                 if (val_unquoted) g_free (val_unquoted);
 878             }
 879             break;
 880         /* CSS2 */
 881         /* Font */
 882         case SP_PROP_FONT_FAMILY:
 883             if (!style->text_private) sp_style_privatize_text(style);
 884             if (!style->text->font_family.set) {
 885                 gchar *val_unquoted = attribute_unquote(val);
 886                 sp_style_read_istring(&style->text->font_family, val_unquoted);
 887                 if (val_unquoted) g_free (val_unquoted);
 888             }
 889             break;
 890         case SP_PROP_FONT_SIZE:
 891             SPS_READ_IFONTSIZE_IF_UNSET(&style->font_size, val);
 892             break;
 893         case SP_PROP_FONT_SIZE_ADJUST:
 894             if (strcmp(val, "none") != 0) {
 895                 g_warning("Unimplemented style property id SP_PROP_FONT_SIZE_ADJUST: value: %s", val);
 896             }
 897             break;
 898         case SP_PROP_FONT_STYLE:
 899             SPS_READ_IENUM_IF_UNSET(&style->font_style, val, enum_font_style, true);
 900             break;
 901         case SP_PROP_FONT_VARIANT:
 902             SPS_READ_IENUM_IF_UNSET(&style->font_variant, val, enum_font_variant, true);
 903             break;
 904         case SP_PROP_FONT_WEIGHT:
 905             SPS_READ_IENUM_IF_UNSET(&style->font_weight, val, enum_font_weight, true);
 906             break;
 907         case SP_PROP_FONT_STRETCH:
 908             SPS_READ_IENUM_IF_UNSET(&style->font_stretch, val, enum_font_stretch, true);
 909             break;
 910         case SP_PROP_FONT:
 911             if (!style->text_private) sp_style_privatize_text(style);
 912             if (!style->text->font.set) {
 913                 g_free(style->text->font.value);
 914                 style->text->font.value = g_strdup(val);
 915                 style->text->font.set = TRUE;
 916                 style->text->font.inherit = (val && !strcmp(val, "inherit"));
 917             }
 918             break;
 919             /* Text */
 920         case SP_PROP_TEXT_INDENT:
 921             SPS_READ_ILENGTH_IF_UNSET(&style->text_indent, val);
 922             break;
 923         case SP_PROP_TEXT_ALIGN:
 924             SPS_READ_IENUM_IF_UNSET(&style->text_align, val, enum_text_align, true);
 925             break;
 926         case SP_PROP_TEXT_DECORATION:
 927             if (!style->text_decoration.set) {
 928                 sp_style_read_itextdecoration(&style->text_decoration, val);
 929             }
 930             break;
 931         case SP_PROP_LINE_HEIGHT:
 932             if (!style->line_height.set) {
 933                 sp_style_read_ilengthornormal(&style->line_height, val);
 934             }
 935             break;
 936         case SP_PROP_LETTER_SPACING:
 937             if (!style->letter_spacing.set) {
 938                 sp_style_read_ilengthornormal(&style->letter_spacing, val);
 939             }
 940             break;
 941         case SP_PROP_WORD_SPACING:
 942             if (!style->word_spacing.set) {
 943                 sp_style_read_ilengthornormal(&style->word_spacing, val);
 944             }
 945             break;
 946         case SP_PROP_TEXT_TRANSFORM:
 947             SPS_READ_IENUM_IF_UNSET(&style->text_transform, val, enum_text_transform, true);
 948             break;
 949             /* Text (css3) */
 950         case SP_PROP_DIRECTION:
 951             SPS_READ_IENUM_IF_UNSET(&style->direction, val, enum_direction, true);
 952             break;
 953         case SP_PROP_BLOCK_PROGRESSION:
 954             SPS_READ_IENUM_IF_UNSET(&style->block_progression, val, enum_block_progression, true);
 955             break;
 956         case SP_PROP_WRITING_MODE:
 957             SPS_READ_IENUM_IF_UNSET(&style->writing_mode, val, enum_writing_mode, true);
 958             break;
 959         case SP_PROP_TEXT_ANCHOR:
 960             SPS_READ_IENUM_IF_UNSET(&style->text_anchor, val, enum_text_anchor, true);
 961             break;
 962         case SP_PROP_BASELINE_SHIFT:
 963             SPS_READ_IBASELINE_SHIFT_IF_UNSET(&style->baseline_shift, val);
 964             break;
 965             /* Text (unimplemented) */
 966         case SP_PROP_TEXT_RENDERING: {
 967             /* Ignore the hint. */
 968             SPIEnum dummy;
 969             SPS_READ_IENUM_IF_UNSET(&dummy, val, enum_text_rendering, true);
 970             break;
 971         }
 972         case SP_PROP_ALIGNMENT_BASELINE:
 973             g_warning("Unimplemented style property SP_PROP_ALIGNMENT_BASELINE: value: %s", val);
 974             break;
 975         case SP_PROP_DOMINANT_BASELINE:
 976             g_warning("Unimplemented style property SP_PROP_DOMINANT_BASELINE: value: %s", val);
 977             break;
 978         case SP_PROP_GLYPH_ORIENTATION_HORIZONTAL:
 979             g_warning("Unimplemented style property SP_PROP_ORIENTATION_HORIZONTAL: value: %s", val);
 980             break;
 981         case SP_PROP_GLYPH_ORIENTATION_VERTICAL:
 982             g_warning("Unimplemented style property SP_PROP_ORIENTATION_VERTICAL: value: %s", val);
 983             break;
 984         case SP_PROP_KERNING:
 985             g_warning("Unimplemented style property SP_PROP_KERNING: value: %s", val);
 986             break;
 987             /* Misc */
 988         case SP_PROP_CLIP:
 989             g_warning("Unimplemented style property SP_PROP_CLIP: value: %s", val);
 990             break;
 991         case SP_PROP_COLOR:
 992             if (!style->color.set) {
 993                 sp_style_read_icolor(&style->color, val, style, (style->object) ? SP_OBJECT_DOCUMENT(style->object) : NULL);
 994             }
 995             break;
 996         case SP_PROP_CURSOR:
 997             g_warning("Unimplemented style property SP_PROP_CURSOR: value: %s", val);
 998             break;
 999         case SP_PROP_DISPLAY:
1000             SPS_READ_IENUM_IF_UNSET(&style->display, val, enum_display, true);
1001             break;
1002         case SP_PROP_OVERFLOW:
1003             /** \todo
1004              * FIXME: not supported properly yet, we just read and write it,
1005              * but act as if it is always "display".
1006              */
1007             SPS_READ_IENUM_IF_UNSET(&style->overflow, val, enum_overflow, true);
1008             break;
1009         case SP_PROP_VISIBILITY:
1010             SPS_READ_IENUM_IF_UNSET(&style->visibility, val, enum_visibility, true);
1011             break;
1012             /* SVG */
1013             /* Clip/Mask */
1014         case SP_PROP_CLIP_PATH:
1015             /** \todo
1016              * This is a workaround. Inkscape only supports 'clip-path' as SVG attribute, not as
1017              * style property. By having both CSS and SVG attribute set, editing of clip-path
1018              * will fail, since CSS always overwrites SVG attributes.
1019              * Fixes Bug #324849
1020              */
1021             g_warning("attribute 'clip-path' given as CSS");
1022             style->object->repr->setAttribute("clip-path", val);
1023             break;
1024         case SP_PROP_CLIP_RULE:
1025             g_warning("Unimplemented style property SP_PROP_CLIP_RULE: value: %s", val);
1026             break;
1027         case SP_PROP_MASK:
1028             /** \todo
1029              * See comment for SP_PROP_CLIP_PATH
1030              */
1031             g_warning("attribute 'mask' given as CSS");
1032             style->object->repr->setAttribute("mask", val);
1033             break;
1034         case SP_PROP_OPACITY:
1035             if (!style->opacity.set) {
1036                 sp_style_read_iscale24(&style->opacity, val);
1037             }
1038             break;
1039         case SP_PROP_ENABLE_BACKGROUND:
1040             SPS_READ_IENUM_IF_UNSET(&style->enable_background, val,
1041                                     enum_enable_background, true);
1042             break;
1043             /* Filter */
1044         case SP_PROP_FILTER:
1045             if (!style->filter.set && !style->filter.inherit) {
1046                 sp_style_read_ifilter(val, style, (style->object) ? SP_OBJECT_DOCUMENT(style->object) : NULL);
1047             }
1048             break;
1049         case SP_PROP_FLOOD_COLOR:
1050             g_warning("Unimplemented style property SP_PROP_FLOOD_COLOR: value: %s", val);
1051             break;
1052         case SP_PROP_FLOOD_OPACITY:
1053             g_warning("Unimplemented style property SP_PROP_FLOOD_OPACITY: value: %s", val);
1054             break;
1055         case SP_PROP_LIGHTING_COLOR:
1056             g_warning("Unimplemented style property SP_PROP_LIGHTING_COLOR: value: %s", val);
1057             break;
1058             /* Gradient */
1059         case SP_PROP_STOP_COLOR:
1060             g_warning("Unimplemented style property SP_PROP_STOP_COLOR: value: %s", val);
1061             break;
1062         case SP_PROP_STOP_OPACITY:
1063             g_warning("Unimplemented style property SP_PROP_STOP_OPACITY: value: %s", val);
1064             break;
1065             /* Interactivity */
1066         case SP_PROP_POINTER_EVENTS:
1067             g_warning("Unimplemented style property SP_PROP_POINTER_EVENTS: value: %s", val);
1068             break;
1069             /* Paint */
1070         case SP_PROP_COLOR_INTERPOLATION:
1071             g_warning("Unimplemented style property SP_PROP_COLOR_INTERPOLATION: value: %s", val);
1072             break;
1073         case SP_PROP_COLOR_INTERPOLATION_FILTERS:
1074             g_warning("Unimplemented style property SP_PROP_INTERPOLATION_FILTERS: value: %s", val);
1075             break;
1076         case SP_PROP_COLOR_PROFILE:
1077             g_warning("Unimplemented style property SP_PROP_COLOR_PROFILE: value: %s", val);
1078             break;
1079         case SP_PROP_COLOR_RENDERING: {
1080             /* Ignore the hint. */
1081             SPIEnum dummy;
1082             SPS_READ_IENUM_IF_UNSET(&dummy, val, enum_color_rendering, true);
1083             break;
1084         }
1085         case SP_PROP_FILL:
1086             if (!style->fill.set) {
1087                 sp_style_read_ipaint(&style->fill, val, style, (style->object) ? SP_OBJECT_DOCUMENT(style->object) : NULL);
1088             }
1089             break;
1090         case SP_PROP_FILL_OPACITY:
1091             if (!style->fill_opacity.set) {
1092                 sp_style_read_iscale24(&style->fill_opacity, val);
1093             }
1094             break;
1095         case SP_PROP_FILL_RULE:
1096             if (!style->fill_rule.set) {
1097                 sp_style_read_ienum(&style->fill_rule, val, enum_fill_rule, true);
1098             }
1099             break;
1100         case SP_PROP_IMAGE_RENDERING: {
1101             /* Ignore the hint. */
1102             SPIEnum dummy;
1103             SPS_READ_IENUM_IF_UNSET(&dummy, val, enum_image_rendering, true);
1104             break;
1105         }
1106         case SP_PROP_MARKER:
1107             /* TODO:  Call sp_uri_reference_resolve(SPDocument *document, guchar const *uri) */
1108             /* style->marker[SP_MARKER_LOC] = g_quark_from_string(val); */
1109             if (!style->marker[SP_MARKER_LOC].set) {
1110                 g_free(style->marker[SP_MARKER_LOC].value);
1111                 style->marker[SP_MARKER_LOC].value = g_strdup(val);
1112                 style->marker[SP_MARKER_LOC].set = TRUE;
1113                 style->marker[SP_MARKER_LOC].inherit = (val && !strcmp(val, "inherit"));
1114             }
1115             break;
1116
1117         case SP_PROP_MARKER_START:
1118             /* TODO:  Call sp_uri_reference_resolve(SPDocument *document, guchar const *uri) */
1119             if (!style->marker[SP_MARKER_LOC_START].set) {
1120                 g_free(style->marker[SP_MARKER_LOC_START].value);
1121                 style->marker[SP_MARKER_LOC_START].value = g_strdup(val);
1122                 style->marker[SP_MARKER_LOC_START].set = TRUE;
1123                 style->marker[SP_MARKER_LOC_START].inherit = (val && !strcmp(val, "inherit"));
1124             }
1125             break;
1126         case SP_PROP_MARKER_MID:
1127             /* TODO:  Call sp_uri_reference_resolve(SPDocument *document, guchar const *uri) */
1128             if (!style->marker[SP_MARKER_LOC_MID].set) {
1129                 g_free(style->marker[SP_MARKER_LOC_MID].value);
1130                 style->marker[SP_MARKER_LOC_MID].value = g_strdup(val);
1131                 style->marker[SP_MARKER_LOC_MID].set = TRUE;
1132                 style->marker[SP_MARKER_LOC_MID].inherit = (val && !strcmp(val, "inherit"));
1133             }
1134             break;
1135         case SP_PROP_MARKER_END:
1136             /* TODO:  Call sp_uri_reference_resolve(SPDocument *document, guchar const *uri) */
1137             if (!style->marker[SP_MARKER_LOC_END].set) {
1138                 g_free(style->marker[SP_MARKER_LOC_END].value);
1139                 style->marker[SP_MARKER_LOC_END].value = g_strdup(val);
1140                 style->marker[SP_MARKER_LOC_END].set = TRUE;
1141                 style->marker[SP_MARKER_LOC_END].inherit = (val && !strcmp(val, "inherit"));
1142             }
1143             break;
1144
1145         case SP_PROP_SHAPE_RENDERING: {
1146             /* Ignore the hint. */
1147             SPIEnum dummy;
1148             SPS_READ_IENUM_IF_UNSET(&dummy, val, enum_shape_rendering, true);
1149             break;
1150         }
1151
1152         case SP_PROP_STROKE:
1153             if (!style->stroke.set) {
1154                 sp_style_read_ipaint(&style->stroke, val, style, (style->object) ? SP_OBJECT_DOCUMENT(style->object) : NULL);
1155             }
1156             break;
1157         case SP_PROP_STROKE_WIDTH:
1158             SPS_READ_ILENGTH_IF_UNSET(&style->stroke_width, val);
1159             break;
1160         case SP_PROP_STROKE_DASHARRAY:
1161             if (!style->stroke_dasharray_set) {
1162                 sp_style_read_dash(style, val);
1163             }
1164             break;
1165         case SP_PROP_STROKE_DASHOFFSET:
1166             if (!style->stroke_dashoffset_set) {
1167                 if (sp_svg_number_read_d(val, &style->stroke_dash.offset)) {
1168                     style->stroke_dashoffset_set = TRUE;
1169                 } else if (val && !strcmp(val, "inherit")) {
1170                     style->stroke_dashoffset_set = TRUE;
1171                     style->stroke_dashoffset_inherit = TRUE;
1172                 } else {
1173                     style->stroke_dashoffset_set = FALSE;
1174                 }
1175             }
1176             break;
1177         case SP_PROP_STROKE_LINECAP:
1178             if (!style->stroke_linecap.set) {
1179                 sp_style_read_ienum(&style->stroke_linecap, val, enum_stroke_linecap, true);
1180             }
1181             break;
1182         case SP_PROP_STROKE_LINEJOIN:
1183             if (!style->stroke_linejoin.set) {
1184                 sp_style_read_ienum(&style->stroke_linejoin, val, enum_stroke_linejoin, true);
1185             }
1186             break;
1187         case SP_PROP_STROKE_MITERLIMIT:
1188             if (!style->stroke_miterlimit.set) {
1189                 sp_style_read_ifloat(&style->stroke_miterlimit, val);
1190             }
1191             break;
1192         case SP_PROP_STROKE_OPACITY:
1193             if (!style->stroke_opacity.set) {
1194                 sp_style_read_iscale24(&style->stroke_opacity, val);
1195             }
1196             break;
1197
1198         default:
1199             g_warning("Invalid style property id: %d value: %s", id, val);
1200             break;
1201     }
1202 }
1203
1204 static void
1205 sp_style_merge_style_from_decl(SPStyle *const style, CRDeclaration const *const decl)
1206 {
1207     /** \todo Ensure that property is lcased, as per
1208      * http://www.w3.org/TR/REC-CSS2/syndata.html#q4.
1209      * Should probably be done in libcroco.
1210      */
1211     unsigned const prop_idx = sp_attribute_lookup(decl->property->stryng->str);
1212     if (prop_idx != SP_ATTR_INVALID) {
1213         /** \todo
1214          * effic: Test whether the property is already set before trying to
1215          * convert to string. Alternatively, set from CRTerm directly rather
1216          * than converting to string.
1217          */
1218         guchar *const str_value_unsigned = cr_term_to_string(decl->value);
1219         gchar *const str_value = reinterpret_cast<gchar *>(str_value_unsigned);
1220         sp_style_merge_property(style, prop_idx, str_value);
1221         g_free(str_value);
1222     }
1223 }
1224
1225 static void
1226 sp_style_merge_from_props(SPStyle *const style, CRPropList *const props)
1227 {
1228 #if 0 /* forwards */
1229     for (CRPropList const *cur = props; cur; cur = cr_prop_list_get_next(cur)) {
1230         CRDeclaration *decl = NULL;
1231         cr_prop_list_get_decl(cur, &decl);
1232         sp_style_merge_style_from_decl(style, decl);
1233     }
1234 #else /* in reverse order, as we need later declarations to take precedence over earlier ones. */
1235     if (props) {
1236         sp_style_merge_from_props(style, cr_prop_list_get_next(props));
1237         CRDeclaration *decl = NULL;
1238         cr_prop_list_get_decl(props, &decl);
1239         sp_style_merge_style_from_decl(style, decl);
1240     }
1241 #endif
1242 }
1243
1244 /**
1245  * \pre decl_list != NULL
1246  */
1247 static void
1248 sp_style_merge_from_decl_list(SPStyle *const style, CRDeclaration const *const decl_list)
1249 {
1250     // read the decls from end to start, using head recursion, so that latter declarations override
1251     // (Ref: http://www.w3.org/TR/REC-CSS2/cascade.html#cascading-order point 4.)
1252     // because sp_style_merge_style_from_decl only sets properties that are unset
1253     if (decl_list->next) {
1254         sp_style_merge_from_decl_list(style, decl_list->next);
1255     }
1256     sp_style_merge_style_from_decl(style, decl_list);
1257 }
1258
1259 static CRSelEng *
1260 sp_repr_sel_eng()
1261 {
1262     CRSelEng *const ret = cr_sel_eng_new();
1263     cr_sel_eng_set_node_iface(ret, &Inkscape::XML::croco_node_iface);
1264
1265     /** \todo
1266      * Check whether we need to register any pseudo-class handlers.
1267      * libcroco has its own default handlers for first-child and lang.
1268      *
1269      * We probably want handlers for link and arguably visited (though
1270      * inkscape can't visit links at the time of writing).  hover etc.
1271      * more useful in inkview than the editor inkscape.
1272      *
1273      * http://www.w3.org/TR/SVG11/styling.html#StylingWithCSS says that
1274      * the following should be honoured, at least by inkview:
1275      * :hover, :active, :focus, :visited, :link.
1276      */
1277
1278     g_assert(ret);
1279     return ret;
1280 }
1281
1282 static void
1283 sp_style_merge_from_object_stylesheet(SPStyle *const style, SPObject const *const object)
1284 {
1285     static CRSelEng *sel_eng = NULL;
1286     if (!sel_eng) {
1287         sel_eng = sp_repr_sel_eng();
1288     }
1289
1290     CRPropList *props = NULL;
1291     CRStatus status = cr_sel_eng_get_matched_properties_from_cascade(sel_eng,
1292                                                                      object->document->style_cascade,
1293                                                                      object->repr,
1294                                                                      &props);
1295     g_return_if_fail(status == CR_OK);
1296     /// \todo Check what errors can occur, and handle them properly.
1297     if (props) {
1298         sp_style_merge_from_props(style, props);
1299         cr_prop_list_destroy(props);
1300     }
1301 }
1302
1303 /**
1304  * Parses a style="..." string and merges it with an existing SPStyle.
1305  */
1306 void
1307 sp_style_merge_from_style_string(SPStyle *const style, gchar const *const p)
1308 {
1309     /*
1310      * Reference: http://www.w3.org/TR/SVG11/styling.html#StyleAttribute:
1311      * ``When CSS styling is used, CSS inline style is specified by including
1312      * semicolon-separated property declarations of the form "name : value"
1313      * within the style attribute''.
1314      *
1315      * That's fairly ambiguous.  Is a `value' allowed to contain semicolons?
1316      * Why does it say "including", what else is allowed in the style
1317      * attribute value?
1318      */
1319
1320     CRDeclaration *const decl_list
1321         = cr_declaration_parse_list_from_buf(reinterpret_cast<guchar const *>(p), CR_UTF_8);
1322     if (decl_list) {
1323         sp_style_merge_from_decl_list(style, decl_list);
1324         cr_declaration_destroy(decl_list);
1325     }
1326 }
1327
1328 /** Indexed by SP_CSS_FONT_SIZE_blah. */
1329 static float const font_size_table[] = {6.0, 8.0, 10.0, 12.0, 14.0, 18.0, 24.0};
1330
1331 static void
1332 sp_style_merge_font_size_from_parent(SPIFontSize &child, SPIFontSize const &parent)
1333 {
1334     /* 'font-size' */
1335     if (!child.set || child.inherit) {
1336         /* Inherit the computed value.  Reference: http://www.w3.org/TR/SVG11/styling.html#Inheritance */
1337         child.computed = parent.computed;
1338     } else if (child.type == SP_FONT_SIZE_LITERAL) {
1339         /** \todo
1340          * fixme: SVG and CSS do not specify clearly, whether we should use
1341          * user or screen coordinates (Lauris)
1342          */
1343         if (child.value < SP_CSS_FONT_SIZE_SMALLER) {
1344             child.computed = font_size_table[child.value];
1345         } else if (child.value == SP_CSS_FONT_SIZE_SMALLER) {
1346             child.computed = parent.computed / 1.2;
1347         } else if (child.value == SP_CSS_FONT_SIZE_LARGER) {
1348             child.computed = parent.computed * 1.2;
1349         } else {
1350             /* Illegal value */
1351         }
1352     } else if (child.type == SP_FONT_SIZE_PERCENTAGE) {
1353         /* Unlike most other lengths, percentage for font size is relative to parent computed value
1354          * rather than viewport. */
1355         child.computed = parent.computed * SP_F8_16_TO_FLOAT(child.value);
1356     }
1357 }
1358
1359 // Some shifts are defined relative to parent.
1360 static void
1361 sp_style_merge_baseline_shift_from_parent(SPIBaselineShift &child, SPIBaselineShift const &parent,
1362                                           SPIFontSize const &pfont_size)
1363 {
1364     /* 'baseline-shift' */
1365     if (!child.set || child.inherit) {
1366         /* Inherit the computed value.  Reference: http://www.w3.org/TR/SVG11/styling.html#Inheritance */
1367         child.computed = parent.computed;  // Does this make sense (applying a shift a second time)?
1368     } else if (child.type == SP_BASELINE_SHIFT_LITERAL) {
1369         if( child.literal == SP_CSS_BASELINE_SHIFT_BASELINE ) {
1370             child.computed = 0; // No change
1371         } else if (child.literal == SP_CSS_BASELINE_SHIFT_SUB ) {
1372             // Should use subscript position from font relative to alphabetic baseline
1373             // In mean time use values from OpenOffice and Adobe
1374             child.computed = -0.33 * pfont_size.computed;
1375         } else if (child.literal == SP_CSS_BASELINE_SHIFT_SUPER ) {
1376             // Should use superscript position from font relative to alphabetic baseline
1377             // In mean time use values from OpenOffice and Adobe
1378             child.computed =  0.33 * pfont_size.computed;
1379         } else {
1380             /* Illegal value */
1381         }
1382     } else if (child.type == SP_BASELINE_SHIFT_PERCENTAGE) {
1383         // Percentage for baseline shift is relative to computed "line-height"
1384         // which is just font-size (see SVG1.1 'font').
1385         child.computed = pfont_size.computed * child.value;
1386     } else if (child.type == SP_BASELINE_SHIFT_LENGTH) {
1387         switch (child.unit) {
1388             case SP_CSS_UNIT_EM:
1389                 child.computed = child.value * pfont_size.computed;
1390                 break;
1391             case SP_CSS_UNIT_EX:
1392                 child.computed = child.value * 0.5 * pfont_size.computed;
1393                 break;
1394             default:
1395                 /* No change */
1396                 break;
1397         }
1398     }
1399 }
1400
1401 /**
1402  * Sets computed values in \a style, which may involve inheriting from (or in some other way
1403  * calculating from) corresponding computed values of \a parent.
1404  *
1405  * References: http://www.w3.org/TR/SVG11/propidx.html shows what properties inherit by default.
1406  * http://www.w3.org/TR/SVG11/styling.html#Inheritance gives general rules as to what it means to
1407  * inherit a value.  http://www.w3.org/TR/REC-CSS2/cascade.html#computed-value is more precise
1408  * about what the computed value is (not obvious for lengths).
1409  *
1410  * \pre \a parent's computed values are already up-to-date.
1411  */
1412 void
1413 sp_style_merge_from_parent(SPStyle *const style, SPStyle const *const parent)
1414 {
1415     g_return_if_fail(style != NULL);
1416
1417     /** \todo
1418      * fixme: Check for existing callers that might pass null parent.
1419      * This should probably be g_return_if_fail, or else we should make a
1420      * best attempt to set computed values correctly without having a parent
1421      * (i.e., by assuming parent has initial values).
1422      */
1423     if (!parent)
1424         return;
1425
1426     /* CSS2 */
1427     /* Font */
1428     sp_style_merge_font_size_from_parent(style->font_size, parent->font_size);
1429
1430     /* 'font-style' */
1431     if (!style->font_style.set || style->font_style.inherit) {
1432         style->font_style.computed = parent->font_style.computed;
1433     }
1434
1435     /* 'font-variant' */
1436     if (!style->font_variant.set || style->font_variant.inherit) {
1437         style->font_variant.computed = parent->font_variant.computed;
1438     }
1439
1440     /* 'font-weight' */
1441     if (!style->font_weight.set || style->font_weight.inherit) {
1442         style->font_weight.computed = parent->font_weight.computed;
1443     } else if (style->font_weight.value == SP_CSS_FONT_WEIGHT_NORMAL) {
1444         /** \todo
1445          * fixme: This is unconditional, i.e., happens even if parent not
1446          * present.
1447          */
1448         style->font_weight.computed = SP_CSS_FONT_WEIGHT_400;
1449     } else if (style->font_weight.value == SP_CSS_FONT_WEIGHT_BOLD) {
1450         style->font_weight.computed = SP_CSS_FONT_WEIGHT_700;
1451     } else if (style->font_weight.value == SP_CSS_FONT_WEIGHT_LIGHTER) {
1452         unsigned const parent_val = parent->font_weight.computed;
1453         g_assert(SP_CSS_FONT_WEIGHT_100 == 0);
1454         // strictly, 'bolder' and 'lighter' should go to the next weight
1455         // expressible in the current font family, but that's difficult to
1456         // find out, so jumping by 3 seems an appropriate approximation
1457         style->font_weight.computed = (parent_val <= SP_CSS_FONT_WEIGHT_100 + 3
1458                                        ? (unsigned)SP_CSS_FONT_WEIGHT_100
1459                                        : parent_val - 3);
1460         g_assert(style->font_weight.computed <= (unsigned) SP_CSS_FONT_WEIGHT_900);
1461     } else if (style->font_weight.value == SP_CSS_FONT_WEIGHT_BOLDER) {
1462         unsigned const parent_val = parent->font_weight.computed;
1463         g_assert(parent_val <= SP_CSS_FONT_WEIGHT_900);
1464         style->font_weight.computed = (parent_val >= SP_CSS_FONT_WEIGHT_900 - 3
1465                                        ? (unsigned)SP_CSS_FONT_WEIGHT_900
1466                                        : parent_val + 3);
1467         g_assert(style->font_weight.computed <= (unsigned) SP_CSS_FONT_WEIGHT_900);
1468     }
1469
1470     /* 'font-stretch' */
1471     if (!style->font_stretch.set || style->font_stretch.inherit) {
1472         style->font_stretch.computed = parent->font_stretch.computed;
1473     } else if (style->font_stretch.value == SP_CSS_FONT_STRETCH_NARROWER) {
1474         unsigned const parent_val = parent->font_stretch.computed;
1475         style->font_stretch.computed = (parent_val == SP_CSS_FONT_STRETCH_ULTRA_CONDENSED
1476                                         ? parent_val
1477                                         : parent_val - 1);
1478         g_assert(style->font_stretch.computed <= (unsigned) SP_CSS_FONT_STRETCH_ULTRA_EXPANDED);
1479     } else if (style->font_stretch.value == SP_CSS_FONT_STRETCH_WIDER) {
1480         unsigned const parent_val = parent->font_stretch.computed;
1481         g_assert(parent_val <= SP_CSS_FONT_STRETCH_ULTRA_EXPANDED);
1482         style->font_stretch.computed = (parent_val == SP_CSS_FONT_STRETCH_ULTRA_EXPANDED
1483                                         ? parent_val
1484                                         : parent_val + 1);
1485         g_assert(style->font_stretch.computed <= (unsigned) SP_CSS_FONT_STRETCH_ULTRA_EXPANDED);
1486     }
1487
1488     /* text (css2) */
1489     if (!style->text_indent.set || style->text_indent.inherit) {
1490         style->text_indent.computed = parent->text_indent.computed;
1491     }
1492
1493     if (!style->text_align.set || style->text_align.inherit) {
1494         style->text_align.computed = parent->text_align.computed;
1495     }
1496
1497     if (!style->text_decoration.set || style->text_decoration.inherit) {
1498         style->text_decoration.underline = parent->text_decoration.underline;
1499         style->text_decoration.overline = parent->text_decoration.overline;
1500         style->text_decoration.line_through = parent->text_decoration.line_through;
1501         style->text_decoration.blink = parent->text_decoration.blink;
1502     }
1503
1504     if (!style->line_height.set || style->line_height.inherit) {
1505         style->line_height.value = parent->line_height.value;
1506         style->line_height.computed = parent->line_height.computed;
1507         style->line_height.normal = parent->line_height.normal;
1508     }
1509
1510     if (!style->letter_spacing.set || style->letter_spacing.inherit) {
1511         style->letter_spacing.value = parent->letter_spacing.value;
1512         style->letter_spacing.computed = parent->letter_spacing.computed;
1513         style->letter_spacing.normal = parent->letter_spacing.normal;
1514     }
1515
1516     if (!style->word_spacing.set || style->word_spacing.inherit) {
1517         style->word_spacing.value = parent->word_spacing.value;
1518         style->word_spacing.computed = parent->word_spacing.computed;
1519         style->word_spacing.normal = parent->word_spacing.normal;
1520     }
1521
1522     if (!style->text_transform.set || style->text_transform.inherit) {
1523         style->text_transform.computed = parent->text_transform.computed;
1524     }
1525
1526     if (!style->direction.set || style->direction.inherit) {
1527         style->direction.computed = parent->direction.computed;
1528     }
1529
1530     if (!style->block_progression.set || style->block_progression.inherit) {
1531         style->block_progression.computed = parent->block_progression.computed;
1532     }
1533
1534     if (!style->writing_mode.set || style->writing_mode.inherit) {
1535         style->writing_mode.computed = parent->writing_mode.computed;
1536     }
1537
1538     if (!style->text_anchor.set || style->text_anchor.inherit) {
1539         style->text_anchor.computed = parent->text_anchor.computed;
1540     }
1541
1542     /* Baseline Shift... Some shifts are relative to parent. */
1543     sp_style_merge_baseline_shift_from_parent(style->baseline_shift, parent->baseline_shift,
1544                                               parent->font_size);
1545
1546     if (style->opacity.inherit) {
1547         style->opacity.value = parent->opacity.value;
1548     }
1549
1550     /* Color */
1551     if (!style->color.set || style->color.inherit) {
1552         sp_style_merge_ipaint(style, &style->color, &parent->color);
1553     }
1554
1555     /* Fill */
1556     if (!style->fill.set || style->fill.inherit || style->fill.currentcolor) {
1557         sp_style_merge_ipaint(style, &style->fill, &parent->fill);
1558     }
1559
1560     if (!style->fill_opacity.set || style->fill_opacity.inherit) {
1561         style->fill_opacity.value = parent->fill_opacity.value;
1562     }
1563
1564     if (!style->fill_rule.set || style->fill_rule.inherit) {
1565         style->fill_rule.computed = parent->fill_rule.computed;
1566     }
1567
1568     /* Stroke */
1569     if (!style->stroke.set || style->stroke.inherit || style->stroke.currentcolor) {
1570         sp_style_merge_ipaint(style, &style->stroke, &parent->stroke);
1571     }
1572
1573     if (!style->stroke_width.set || style->stroke_width.inherit) {
1574         style->stroke_width.computed = parent->stroke_width.computed;
1575     } else {
1576         /* Update computed value for any change in font inherited from parent. */
1577         double const em = style->font_size.computed;
1578         if (style->stroke_width.unit == SP_CSS_UNIT_EM) {
1579             style->stroke_width.computed = style->stroke_width.value * em;
1580         } else if (style->stroke_width.unit == SP_CSS_UNIT_EX) {
1581             double const ex = em * 0.5;  // fixme: Get x height from libnrtype or pango.
1582             style->stroke_width.computed = style->stroke_width.value * ex;
1583         }
1584     }
1585
1586     if (!style->stroke_linecap.set || style->stroke_linecap.inherit) {
1587         style->stroke_linecap.computed = parent->stroke_linecap.computed;
1588     }
1589
1590     if (!style->stroke_linejoin.set || style->stroke_linejoin.inherit) {
1591         style->stroke_linejoin.computed = parent->stroke_linejoin.computed;
1592     }
1593
1594     if (!style->stroke_miterlimit.set || style->stroke_miterlimit.inherit) {
1595         style->stroke_miterlimit.value = parent->stroke_miterlimit.value;
1596     }
1597
1598     if (!style->stroke_dasharray_set || style->stroke_dasharray_inherit) {
1599         style->stroke_dash.n_dash = parent->stroke_dash.n_dash;
1600         if (style->stroke_dash.n_dash > 0) {
1601             style->stroke_dash.dash = g_new(gdouble, style->stroke_dash.n_dash);
1602             memcpy(style->stroke_dash.dash, parent->stroke_dash.dash, style->stroke_dash.n_dash * sizeof(gdouble));
1603         }
1604     }
1605
1606     if (!style->stroke_dashoffset_set || style->stroke_dashoffset_inherit) {
1607         style->stroke_dash.offset = parent->stroke_dash.offset;
1608     }
1609
1610     if (!style->stroke_opacity.set || style->stroke_opacity.inherit) {
1611         style->stroke_opacity.value = parent->stroke_opacity.value;
1612     }
1613
1614     if (style->text && parent->text) {
1615         if (!style->text->font_family.set || style->text->font_family.inherit) {
1616             g_free(style->text->font_family.value);
1617             style->text->font_family.value = g_strdup(parent->text->font_family.value);
1618         }
1619     }
1620
1621     if (style->text && parent->text) {
1622         if (!style->text->font_specification.set || style->text->font_specification.inherit) {
1623             g_free(style->text->font_specification.value);
1624             style->text->font_specification.value = g_strdup(parent->text->font_specification.value);
1625         }
1626     }
1627
1628     /* Markers - Free the old value and make copy of the new */
1629     for (unsigned i = SP_MARKER_LOC; i < SP_MARKER_LOC_QTY; i++) {
1630         if (!style->marker[i].set || style->marker[i].inherit) {
1631             g_free(style->marker[i].value);
1632             style->marker[i].value = g_strdup(parent->marker[i].value);
1633         }
1634     }
1635
1636     /* Filter effects */
1637     if (style->filter.inherit) {
1638         sp_style_merge_ifilter(style, &parent->filter);
1639     }
1640
1641     if(style->enable_background.inherit) {
1642         style->enable_background.value = parent->enable_background.value;
1643     }
1644 }
1645
1646 template <typename T>
1647 static void
1648 sp_style_merge_prop_from_dying_parent(T &child, T const &parent)
1649 {
1650     if ( ( !(child.set) || child.inherit )
1651          && parent.set && !(parent.inherit) )
1652     {
1653         child = parent;
1654     }
1655 }
1656
1657 /**
1658  * Copy SPIString from parent to child.
1659  */
1660 static void
1661 sp_style_merge_string_prop_from_dying_parent(SPIString &child, SPIString const &parent)
1662 {
1663     if ( ( !(child.set) || child.inherit )
1664          && parent.set && !(parent.inherit) )
1665     {
1666         g_free(child.value);
1667         child.value = g_strdup(parent.value);
1668         child.set = parent.set;
1669         child.inherit = parent.inherit;
1670     }
1671 }
1672
1673 static void
1674 sp_style_merge_paint_prop_from_dying_parent(SPStyle *style,
1675                                             SPIPaint &child, SPIPaint const &parent)
1676 {
1677     /** \todo
1678      * I haven't given this much attention.  See comments below about
1679      * currentColor, colorProfile, and relative URIs.
1680      */
1681     if (!child.set || child.inherit) {
1682         sp_style_merge_ipaint(style, &child, &parent);
1683         child.set = parent.set;
1684         child.inherit = parent.inherit;
1685     }
1686 }
1687
1688 static void
1689 sp_style_merge_rel_enum_prop_from_dying_parent(SPIEnum &child, SPIEnum const &parent,
1690                                                unsigned const max_computed_val,
1691                                                unsigned const smaller_val)
1692 {
1693     /* We assume that min computed val is 0, contiguous up to max_computed_val,
1694        then zero or more other absolute values, then smaller_val then larger_val. */
1695     unsigned const min_computed_val = 0;
1696     unsigned const larger_val = smaller_val + 1;
1697     g_return_if_fail(min_computed_val < max_computed_val);
1698     g_return_if_fail(max_computed_val < smaller_val);
1699
1700     if (parent.set && !parent.inherit) {
1701         if (!child.set || child.inherit) {
1702             child.value = parent.value;
1703             child.set = parent.set;  // i.e. true
1704             child.inherit = parent.inherit;  // i.e. false
1705         } else if (child.value < smaller_val) {
1706             /* Child has absolute value: leave as is. */
1707         } else if ( ( child.value == smaller_val
1708                       && parent.value == larger_val )
1709                     || ( parent.value == smaller_val
1710                          && child.value == larger_val ) )
1711         {
1712             child.set = false;
1713             /*
1714              * Note that this can result in a change in computed value in the
1715              * rare case that the parent's setting was a no-op (i.e. if the
1716              * parent's parent's computed value was already ultra-condensed or
1717              * ultra-expanded).  However, I'd guess that the change is for the
1718              * better: I'd guess that if the properties were specified
1719              * relatively, then the intent is to counteract parent's effect.
1720              * I.e. I believe this is the best code even in that case.
1721              */
1722         } else if (child.value == parent.value) {
1723             /* Leave as is. */
1724             /** \todo
1725              * It's unclear what to do if style and parent specify the same
1726              * relative directive (narrower or wider).  We can either convert
1727              * to absolute specification or coalesce to a single relative
1728              * request (of half the strength of the original pair).
1729              *
1730              * Converting to a single level of relative specification is a
1731              * better choice if the newly-unlinked clone is itself cloned to
1732              * other contexts (inheriting different font stretchiness): it
1733              * would preserve the effect that it will be narrower than
1734              * the inherited context in each case.  The disadvantage is that
1735              * it will ~certainly affect the computed value of the
1736              * newly-unlinked clone.
1737              */
1738         } else {
1739             unsigned const parent_val = parent.computed;
1740             child.value = ( child.value == smaller_val
1741                             ? ( parent_val == min_computed_val
1742                                 ? parent_val
1743                                 : parent_val - 1 )
1744                             : ( parent_val == max_computed_val
1745                                 ? parent_val
1746                                 : parent_val + 1 ) );
1747             g_assert(child.value <= max_computed_val);
1748             child.inherit = false;
1749             g_assert(child.set);
1750         }
1751     }
1752 }
1753
1754 template <typename LengthT>
1755 static void
1756 sp_style_merge_length_prop_from_dying_parent(LengthT &child, LengthT const &parent,
1757                                              double const parent_child_em_ratio)
1758 {
1759     if ( ( !(child.set) || child.inherit )
1760          && parent.set && !(parent.inherit) )
1761     {
1762         child = parent;
1763         switch (parent.unit) {
1764             case SP_CSS_UNIT_EM:
1765             case SP_CSS_UNIT_EX:
1766                 child.value *= parent_child_em_ratio;
1767                 /** \todo
1768                  * fixme: Have separate ex ratio parameter.
1769                  * Get x height from libnrtype or pango.
1770                  */
1771                 if (!IS_FINITE(child.value)) {
1772                     child.value = child.computed;
1773                     child.unit = SP_CSS_UNIT_NONE;
1774                 }
1775                 break;
1776
1777             default:
1778                 break;
1779         }
1780     }
1781 }
1782
1783 static double
1784 get_relative_font_size_frac(SPIFontSize const &font_size)
1785 {
1786     switch (font_size.type) {
1787         case SP_FONT_SIZE_LITERAL: {
1788             switch (font_size.value) {
1789                 case SP_CSS_FONT_SIZE_SMALLER:
1790                     return 5.0 / 6.0;
1791
1792                 case SP_CSS_FONT_SIZE_LARGER:
1793                     return 6.0 / 5.0;
1794
1795                 default:
1796                     g_assert_not_reached();
1797             }
1798         }
1799
1800         case SP_FONT_SIZE_PERCENTAGE:
1801             return SP_F8_16_TO_FLOAT(font_size.value);
1802
1803         case SP_FONT_SIZE_LENGTH:
1804             g_assert_not_reached();
1805     }
1806     g_assert_not_reached();
1807 }
1808
1809 /**
1810  * Combine \a style and \a parent style specifications into a single style specification that
1811  * preserves (as much as possible) the effect of the existing \a style being a child of \a parent.
1812  *
1813  * Called when the parent repr is to be removed (e.g. the parent is a \<use\> element that is being
1814  * unlinked), in which case we copy/adapt property values that are explicitly set in \a parent,
1815  * trying to retain the same visual appearance once the parent is removed.  Interesting cases are
1816  * when there is unusual interaction with the parent's value (opacity, display) or when the value
1817  * can be specified as relative to the parent computed value (font-size, font-weight etc.).
1818  *
1819  * Doesn't update computed values of \a style.  For correctness, you should subsequently call
1820  * sp_style_merge_from_parent against the new parent (presumably \a parent's parent) even if \a
1821  * style was previously up-to-date wrt \a parent.
1822  *
1823  * \pre \a parent's computed values are already up-to-date.
1824  *   (\a style's computed values needn't be up-to-date.)
1825  */
1826 void
1827 sp_style_merge_from_dying_parent(SPStyle *const style, SPStyle const *const parent)
1828 {
1829     /** \note
1830      * The general rule for each property is as follows:
1831      *
1832      *   If style is set to an absolute value, then leave it as is.
1833      *
1834      *   Otherwise (i.e. if style has a relative value):
1835      *
1836      *     If parent is set to an absolute value, then set style to the computed value.
1837      *
1838      *     Otherwise, calculate the combined relative value (e.g. multiplying the two percentages).
1839      */
1840
1841     /* We do font-size first, to ensure that em size is up-to-date. */
1842     /** \todo
1843      * fixme: We'll need to have more font-related things up the top once
1844      * we're getting x-height from pango or libnrtype.
1845      */
1846
1847     /* Some things that allow relative specifications. */
1848     {
1849         /* font-size.  Note that we update the computed font-size of style,
1850            to assist in em calculations later in this function. */
1851         if (parent->font_size.set && !parent->font_size.inherit) {
1852             if (!style->font_size.set || style->font_size.inherit) {
1853                 /* font_size inherits the computed value, so we can use the parent value
1854                  * verbatim. */
1855                 style->font_size = parent->font_size;
1856             } else if ( style->font_size.type == SP_FONT_SIZE_LENGTH ) {
1857                 /* Child already has absolute size (stored in computed value), so do nothing. */
1858             } else if ( style->font_size.type == SP_FONT_SIZE_LITERAL
1859                         && style->font_size.value < SP_CSS_FONT_SIZE_SMALLER ) {
1860                 /* Child already has absolute size, but we ensure that the computed value
1861                    is up-to-date. */
1862                 unsigned const ix = style->font_size.value;
1863                 g_assert(ix < G_N_ELEMENTS(font_size_table));
1864                 style->font_size.computed = font_size_table[ix];
1865             } else {
1866                 /* Child has relative size. */
1867                 double const child_frac(get_relative_font_size_frac(style->font_size));
1868                 style->font_size.set = true;
1869                 style->font_size.inherit = false;
1870                 style->font_size.computed = parent->font_size.computed * child_frac;
1871
1872                 if ( ( parent->font_size.type == SP_FONT_SIZE_LITERAL
1873                        && parent->font_size.value < SP_CSS_FONT_SIZE_SMALLER )
1874                      || parent->font_size.type == SP_FONT_SIZE_LENGTH )
1875                 {
1876                     /* Absolute value. */
1877                     style->font_size.type = SP_FONT_SIZE_LENGTH;
1878                     /* .value is unused for SP_FONT_SIZE_LENGTH. */
1879                 } else {
1880                     /* Relative value. */
1881                     double const parent_frac(get_relative_font_size_frac(parent->font_size));
1882                     style->font_size.type = SP_FONT_SIZE_PERCENTAGE;
1883                     style->font_size.value = SP_F8_16_FROM_FLOAT(parent_frac * child_frac);
1884                 }
1885             }
1886         }
1887
1888         /* 'font-stretch' */
1889         sp_style_merge_rel_enum_prop_from_dying_parent(style->font_stretch,
1890                                                        parent->font_stretch,
1891                                                        SP_CSS_FONT_STRETCH_ULTRA_EXPANDED,
1892                                                        SP_CSS_FONT_STRETCH_NARROWER);
1893
1894         /* font-weight */
1895         sp_style_merge_rel_enum_prop_from_dying_parent(style->font_weight,
1896                                                        parent->font_weight,
1897                                                        SP_CSS_FONT_WEIGHT_900,
1898                                                        SP_CSS_FONT_WEIGHT_LIGHTER);
1899     }
1900
1901
1902     /* Enum values that don't have any relative settings (other than `inherit'). */
1903     {
1904         SPIEnum SPStyle::*const fields[] = {
1905             //nyi: SPStyle::clip_rule,
1906             //nyi: SPStyle::color_interpolation,
1907             //nyi: SPStyle::color_interpolation_filters,
1908             //nyi: SPStyle::color_rendering,
1909             &SPStyle::direction,
1910             &SPStyle::fill_rule,
1911             &SPStyle::font_style,
1912             &SPStyle::font_variant,
1913             //nyi: SPStyle::image_rendering,
1914             //nyi: SPStyle::pointer_events,
1915             //nyi: SPStyle::shape_rendering,
1916             &SPStyle::stroke_linecap,
1917             &SPStyle::stroke_linejoin,
1918             &SPStyle::text_anchor,
1919             //nyi: &SPStyle::text_rendering,
1920             &SPStyle::visibility,
1921             &SPStyle::writing_mode
1922         };
1923
1924         for (unsigned i = 0; i < G_N_ELEMENTS(fields); ++i) {
1925             SPIEnum SPStyle::*const fld = fields[i];
1926             sp_style_merge_prop_from_dying_parent<SPIEnum>(style->*fld, parent->*fld);
1927         }
1928     }
1929
1930     /* A few other simple inheritance properties. */
1931     {
1932         sp_style_merge_prop_from_dying_parent<SPIScale24>(style->fill_opacity, parent->fill_opacity);
1933         sp_style_merge_prop_from_dying_parent<SPIScale24>(style->stroke_opacity, parent->stroke_opacity);
1934         sp_style_merge_prop_from_dying_parent<SPIFloat>(style->stroke_miterlimit, parent->stroke_miterlimit);
1935
1936         /** \todo
1937          * We currently treat text-decoration as if it were a simple inherited
1938          * property (fixme). This code may need changing once we do the
1939          * special fill/stroke inheritance mentioned by the spec.
1940          */
1941         sp_style_merge_prop_from_dying_parent<SPITextDecoration>(style->text_decoration,
1942                                                                  parent->text_decoration);
1943
1944         //nyi: font-size-adjust,  // <number> | none | inherit
1945         //nyi: glyph-orientation-horizontal,
1946         //nyi: glyph-orientation-vertical,
1947     }
1948
1949     /* Properties that involve length but are easy in other respects. */
1950     {
1951         /* The difficulty with lengths is that font-relative units need adjusting if the font
1952          * varies between parent & child.
1953          *
1954          * Lengths specified in the existing child can stay as they are: its computed font
1955          * specification should stay unchanged, so em & ex lengths should continue to mean the same
1956          * size.
1957          *
1958          * Lengths specified in the dying parent in em or ex need to be scaled according to the
1959          * ratio of em or ex size between parent & child.
1960          */
1961         double const parent_child_em_ratio = parent->font_size.computed / style->font_size.computed;
1962
1963         SPILength SPStyle::*const lfields[] = {
1964             &SPStyle::stroke_width,
1965             &SPStyle::text_indent
1966         };
1967         for (unsigned i = 0; i < G_N_ELEMENTS(lfields); ++i) {
1968             SPILength SPStyle::*fld = lfields[i];
1969             sp_style_merge_length_prop_from_dying_parent<SPILength>(style->*fld,
1970                                                                     parent->*fld,
1971                                                                     parent_child_em_ratio);
1972         }
1973
1974         SPILengthOrNormal SPStyle::*const nfields[] = {
1975             &SPStyle::letter_spacing,
1976             &SPStyle::line_height,
1977             &SPStyle::word_spacing
1978         };
1979         for (unsigned i = 0; i < G_N_ELEMENTS(nfields); ++i) {
1980             SPILengthOrNormal SPStyle::*fld = nfields[i];
1981             sp_style_merge_length_prop_from_dying_parent<SPILengthOrNormal>(style->*fld,
1982                                                                             parent->*fld,
1983                                                                             parent_child_em_ratio);
1984         }
1985
1986         //nyi: &SPStyle::kerning: length or `auto'
1987
1988         /* fixme: Move stroke-dash and stroke-dash-offset here once they
1989            can accept units. */
1990     }
1991
1992     /* Properties that involve a URI but are easy in other respects. */
1993     {
1994         /** \todo
1995          * Could cause problems if original object was in another document
1996          * and it used a relative URL.  (At the time of writing, we don't
1997          * allow hrefs to other documents, so this isn't a problem yet.)
1998          * Paint properties also allow URIs.
1999          */
2000         //nyi: cursor,   // may involve change in effect, but we can't do much better
2001         //nyi: color-profile,
2002
2003         // Markers (marker-start, marker-mid, marker-end).
2004         for (unsigned i = SP_MARKER_LOC; i < SP_MARKER_LOC_QTY; i++) {
2005             sp_style_merge_string_prop_from_dying_parent(style->marker[i], parent->marker[i]);
2006         }
2007     }
2008
2009     /* CSS2 */
2010     /* Font */
2011
2012     if (style->text && parent->text) {
2013         sp_style_merge_string_prop_from_dying_parent(style->text->font_specification,
2014                                                      parent->text->font_specification);
2015
2016         sp_style_merge_string_prop_from_dying_parent(style->text->font_family,
2017                                                      parent->text->font_family);
2018     }
2019
2020
2021     /* Properties that don't inherit by default.  Most of these need special handling. */
2022     {
2023         /*
2024          * opacity's effect is cumulative; we set the new value to the combined effect.  The
2025          * default value for opacity is 1.0, not inherit.  (Note that stroke-opacity and
2026          * fill-opacity are quite different from opacity, and don't need any special handling.)
2027          *
2028          * Cases:
2029          * - parent & child were each previously unset, in which case the effective
2030          *   opacity value is 1.0, and style should remain unset.
2031          * - parent was previously unset (so computed opacity value of 1.0)
2032          *   and child was set to inherit.  The merged child should
2033          *   get a value of 1.0, and shouldn't inherit (lest the new parent
2034          *   has a different opacity value).  Given that opacity's default
2035          *   value is 1.0 (rather than inherit), we might as well have the
2036          *   merged child's opacity be unset.
2037          * - parent was previously unset (so opacity 1.0), and child was set to a number.
2038          *   The merged child should retain its existing settings (though it doesn't matter
2039          *   if we make it unset if that number was 1.0).
2040          * - parent was inherit and child was unset.  Merged child should be set to inherit.
2041          * - parent was inherit and child was inherit.  (We can't in general reproduce this
2042          *   effect (short of introducing a new group), but setting opacity to inherit is rare.)
2043          *   If the inherited value was strictly between 0.0 and 1.0 (exclusive) then the merged
2044          *   child's value should be set to the product of the two, i.e. the square of the
2045          *   inherited value, and should not be marked as inherit.  (This decision assumes that it
2046          *   is more important to retain the effective opacity than to retain the inheriting
2047          *   effect, and assumes that the inheriting effect either isn't important enough to create
2048          *   a group or isn't common enough to bother maintaining the code to create a group.)  If
2049          *   the inherited value was 0.0 or 1.0, then marking the merged child as inherit comes
2050          *   closer to maintaining the effect.
2051          * - parent was inherit and child was set to a numerical value.  If the child's value
2052          *   was 1.0, then the merged child should have the same settings as the parent.
2053          *   If the child's value was 0, then the merged child should also be set to 0.
2054          *   If the child's value was anything else, then we do the same as for the inherit/inherit
2055          *   case above: have the merged child set to the product of the two opacities and not
2056          *   marked as inherit, for the same reasons as for that case.
2057          * - parent was set to a value, and child was unset.  The merged child should have
2058          *   parent's settings.
2059          * - parent was set to a value, and child was inherit.  The merged child should
2060          *   be set to the product, i.e. the square of the parent's value.
2061          * - parent & child are each set to a value.  The merged child should be set to the
2062          *   product.
2063          */
2064         if ( !style->opacity.set
2065              || ( !style->opacity.inherit
2066                   && style->opacity.value == SP_SCALE24_MAX ) )
2067         {
2068             style->opacity = parent->opacity;
2069         } else {
2070             /* Ensure that style's computed value is up-to-date. */
2071             if (style->opacity.inherit) {
2072                 style->opacity.value = parent->opacity.value;
2073             }
2074
2075             /* Multiplication of opacities occurs even if a child's opacity is set to inherit. */
2076             style->opacity.value = SP_SCALE24_MUL(style->opacity.value,
2077                                                   parent->opacity.value);
2078
2079             style->opacity.inherit = (parent->opacity.inherit
2080                                       && style->opacity.inherit
2081                                       && (parent->opacity.value == 0 ||
2082                                           parent->opacity.value == SP_SCALE24_MAX));
2083             style->opacity.set = ( style->opacity.inherit
2084                                    || style->opacity.value < SP_SCALE24_MAX );
2085         }
2086
2087         /* display is in principle similar to opacity, but implementation is easier. */
2088         if ( parent->display.set && !parent->display.inherit
2089              && parent->display.value == SP_CSS_DISPLAY_NONE ) {
2090             style->display.value = SP_CSS_DISPLAY_NONE;
2091             style->display.set = true;
2092             style->display.inherit = false;
2093         } else if (style->display.inherit) {
2094             style->display.value = parent->display.value;
2095             style->display.set = parent->display.set;
2096             style->display.inherit = parent->display.inherit;
2097         } else {
2098             /* Leave as is.  (display doesn't inherit by default.) */
2099         }
2100
2101         /* enable-background - this is rather complicated, because
2102          * it is valid only when applied to container elements.
2103          * Let's check a simple case anyhow. */
2104         if (parent->enable_background.set
2105             && !parent->enable_background.inherit
2106             && style->enable_background.inherit)
2107         {
2108             style->enable_background.set = true;
2109             style->enable_background.inherit = false;
2110             style->enable_background.value = parent->enable_background.value;
2111         }
2112
2113         if (!style->filter.set || style->filter.inherit)
2114         {
2115             sp_style_merge_ifilter(style, &parent->filter);
2116         }
2117
2118         /** \todo
2119          * fixme: Check that we correctly handle all properties that don't
2120          * inherit by default (as shown in
2121          * http://www.w3.org/TR/SVG11/propidx.html for most SVG 1.1 properties).
2122          */
2123     }
2124
2125     /* SPIPaint properties (including color). */
2126     {
2127         /** \todo
2128          * Think about the issues involved if specified as currentColor or
2129          * if specified relative to colorProfile, and if the currentColor or
2130          * colorProfile differs between parent \& child.  See also comments
2131          * elsewhere in this function about URIs.
2132          */
2133         SPIPaint SPStyle::*const fields[] = {
2134             &SPStyle::color,
2135             &SPStyle::fill,
2136             &SPStyle::stroke
2137         };
2138         for (unsigned i = 0; i < G_N_ELEMENTS(fields); ++i) {
2139             SPIPaint SPStyle::*const fld = fields[i];
2140             sp_style_merge_paint_prop_from_dying_parent(style, style->*fld, parent->*fld);
2141         }
2142     }
2143
2144     /* Things from SVG 1.2 or CSS3. */
2145     {
2146         /* Note: If we ever support setting string values for text-align then we'd need strdup
2147          * handling here. */
2148         sp_style_merge_prop_from_dying_parent<SPIEnum>(style->text_align, parent->text_align);
2149
2150         sp_style_merge_prop_from_dying_parent<SPIEnum>(style->text_transform, parent->text_transform);
2151         sp_style_merge_prop_from_dying_parent<SPIEnum>(style->block_progression, parent->block_progression);
2152     }
2153
2154     /* Note: this will need length handling once dasharray supports units. */
2155     if ( ( !style->stroke_dasharray_set || style->stroke_dasharray_inherit )
2156          && parent->stroke_dasharray_set && !parent->stroke_dasharray_inherit )
2157     {
2158         style->stroke_dash.n_dash = parent->stroke_dash.n_dash;
2159         if (style->stroke_dash.n_dash > 0) {
2160             style->stroke_dash.dash = g_new(gdouble, style->stroke_dash.n_dash);
2161             memcpy(style->stroke_dash.dash, parent->stroke_dash.dash, style->stroke_dash.n_dash * sizeof(gdouble));
2162         }
2163         style->stroke_dasharray_set = parent->stroke_dasharray_set;
2164         style->stroke_dasharray_inherit = parent->stroke_dasharray_inherit;
2165     }
2166
2167     /* Note: this will need length handling once dasharray_offset supports units. */
2168     if ((!style->stroke_dashoffset_set || style->stroke_dashoffset_inherit) && parent->stroke_dashoffset_set && !parent->stroke_dashoffset_inherit) {
2169         style->stroke_dash.offset = parent->stroke_dash.offset;
2170         style->stroke_dashoffset_set = parent->stroke_dashoffset_set;
2171         style->stroke_dashoffset_inherit = parent->stroke_dashoffset_inherit;
2172         /* TODO: Try to
2173          * represent it as a normal SPILength; though will need to do something about existing
2174          * users of stroke_dash.offset and stroke_dashoffset_set. */
2175     }
2176 }
2177
2178
2179 static void
2180 sp_style_set_ipaint_to_uri(SPStyle *style, SPIPaint *paint, const Inkscape::URI *uri, SPDocument *document)
2181 {
2182     // it may be that this style's SPIPaint has not yet created its URIReference;
2183     // now that we have a document, we can create it here
2184     if (!paint->value.href && document) {
2185         paint->value.href = new SPPaintServerReference(document);
2186         paint->value.href->changedSignal().connect(sigc::bind(sigc::ptr_fun((paint == &style->fill)? sp_style_fill_paint_server_ref_changed : sp_style_stroke_paint_server_ref_changed), style));
2187     }
2188
2189     if (paint->value.href && paint->value.href->getObject())
2190         paint->value.href->detach();
2191
2192     if (paint->value.href) {
2193         try {
2194             paint->value.href->attach(*uri);
2195         } catch (Inkscape::BadURIException &e) {
2196             g_warning("%s", e.what());
2197             paint->value.href->detach();
2198         }
2199     }
2200 }
2201
2202 static void
2203 sp_style_set_ipaint_to_uri_string (SPStyle *style, SPIPaint *paint, const gchar *uri)
2204 {
2205     try {
2206         const Inkscape::URI IURI(uri);
2207         sp_style_set_ipaint_to_uri(style, paint, &IURI, style->document);
2208     } catch (...) {
2209         g_warning("URI failed to parse: %s", uri);
2210     }
2211 }
2212
2213 void
2214 sp_style_set_to_uri_string (SPStyle *style, bool isfill, const gchar *uri)
2215 {
2216     sp_style_set_ipaint_to_uri_string (style, isfill? &style->fill : &style->stroke, uri);
2217 }
2218
2219 /**
2220  *
2221  */
2222 static void
2223 sp_style_merge_ipaint(SPStyle *style, SPIPaint *paint, SPIPaint const *parent)
2224 {
2225     if ((paint->set && paint->currentcolor) || parent->currentcolor) {
2226         bool isset = paint->set;
2227         paint->clear();
2228         paint->set = isset;
2229         paint->currentcolor = TRUE;
2230         paint->setColor(style->color.value.color);
2231         return;
2232     }
2233
2234     paint->clear();
2235     if ( parent->isPaintserver() ) {
2236         if (parent->value.href) {
2237             sp_style_set_ipaint_to_uri(style, paint, parent->value.href->getURI(), parent->value.href->getOwnerDocument());
2238         } else {
2239             g_warning("Expected paint server not found.");
2240         }
2241     } else if ( parent->isColor() ) {
2242         paint->setColor( parent->value.color );
2243     } else if ( parent->isNoneSet() ) {
2244         paint->noneSet = TRUE;
2245     } else if ( parent->isNone() ) {
2246         //
2247     } else {
2248         g_assert_not_reached();
2249     }
2250 }
2251
2252
2253 /**
2254  * Merge filter style from parent.
2255  * Filter effects do not inherit by default
2256  */
2257 static void
2258 sp_style_merge_ifilter(SPStyle *style, SPIFilter const *parent)
2259 {
2260     // FIXME:
2261     // instead of just copying over, we need to _really merge_ the two filters by combining their
2262     // filter primitives
2263
2264     sp_style_filter_clear(style);
2265     style->filter.set = parent->set;
2266     style->filter.inherit = parent->inherit;
2267
2268     if (style->filter.href && style->filter.href->getObject())
2269        style->filter.href->detach();
2270
2271     // it may be that this style has not yet created its SPFilterReference
2272     if (!style->filter.href && style->object && SP_OBJECT_DOCUMENT(style->object)) {
2273             style->filter.href = new SPFilterReference(SP_OBJECT_DOCUMENT(style->object));
2274             style->filter.href->changedSignal().connect(sigc::bind(sigc::ptr_fun(sp_style_filter_ref_changed), style));
2275     }
2276
2277     if (style->filter.href && parent->href && parent->href->getObject()) {
2278         try {
2279             style->filter.href->attach(*parent->href->getURI());
2280         } catch (Inkscape::BadURIException &e) {
2281             g_warning("%s", e.what());
2282             style->filter.href->detach();
2283         }
2284     }
2285 }
2286
2287 /**
2288  * Dumps the style to a CSS string, with either SP_STYLE_FLAG_IFSET or
2289  * SP_STYLE_FLAG_ALWAYS flags. Used with Always for copying an object's
2290  * complete cascaded style to style_clipboard. When you need a CSS string
2291  * for an object in the document tree, you normally call
2292  * sp_style_write_difference instead to take into account the object's parent.
2293  *
2294  * \pre style != NULL.
2295  * \pre flags in {IFSET, ALWAYS}.
2296  * \post ret != NULL.
2297  */
2298 gchar *
2299 sp_style_write_string(SPStyle const *const style, guint const flags)
2300 {
2301     /** \todo
2302      * Merge with write_difference, much duplicate code!
2303      */
2304     g_return_val_if_fail(style != NULL, NULL);
2305     g_return_val_if_fail(((flags == SP_STYLE_FLAG_IFSET) ||
2306                           (flags == SP_STYLE_FLAG_ALWAYS)  ),
2307                          NULL);
2308
2309     gchar c[BMAX];
2310     gchar *p = c;
2311     *p = '\0';
2312
2313     p += sp_style_write_ifontsize(p, c + BMAX - p, "font-size", &style->font_size, NULL, flags);
2314     p += sp_style_write_ienum(p, c + BMAX - p, "font-style", enum_font_style, &style->font_style, NULL, flags);
2315     p += sp_style_write_ienum(p, c + BMAX - p, "font-variant", enum_font_variant, &style->font_variant, NULL, flags);
2316     p += sp_style_write_ienum(p, c + BMAX - p, "font-weight", enum_font_weight, &style->font_weight, NULL, flags);
2317     p += sp_style_write_ienum(p, c + BMAX - p, "font-stretch", enum_font_stretch, &style->font_stretch, NULL, flags);
2318
2319     /* Text */
2320     p += sp_style_write_ilength(p, c + BMAX - p, "text-indent", &style->text_indent, NULL, flags);
2321     p += sp_style_write_ienum(p, c + BMAX - p, "text-align", enum_text_align, &style->text_align, NULL, flags);
2322     p += sp_style_write_itextdecoration(p, c + BMAX - p, "text-decoration", &style->text_decoration, NULL, flags);
2323     p += sp_style_write_ilengthornormal(p, c + BMAX - p, "line-height", &style->line_height, NULL, flags);
2324     p += sp_style_write_ilengthornormal(p, c + BMAX - p, "letter-spacing", &style->letter_spacing, NULL, flags);
2325     p += sp_style_write_ilengthornormal(p, c + BMAX - p, "word-spacing", &style->word_spacing, NULL, flags);
2326     p += sp_style_write_ienum(p, c + BMAX - p, "text-transform", enum_text_transform, &style->text_transform, NULL, flags);
2327     p += sp_style_write_ienum(p, c + BMAX - p, "direction", enum_direction, &style->direction, NULL, flags);
2328     p += sp_style_write_ienum(p, c + BMAX - p, "block-progression", enum_block_progression, &style->block_progression, NULL, flags);
2329     p += sp_style_write_ienum(p, c + BMAX - p, "writing-mode", enum_writing_mode, &style->writing_mode, NULL, flags);
2330
2331     p += sp_style_write_ienum(p, c + BMAX - p, "text-anchor", enum_text_anchor, &style->text_anchor, NULL, flags);
2332     p += sp_style_write_ibaselineshift(p, c + BMAX - p, "baseline-shift", &style->baseline_shift, NULL, flags);
2333
2334
2335     /// \todo fixme: Per type methods need default flag too (lauris)
2336
2337     if (style->opacity.value != SP_SCALE24_MAX) {
2338         p += sp_style_write_iscale24(p, c + BMAX - p, "opacity", &style->opacity, NULL, flags);
2339     }
2340
2341     if (!style->color.noneSet) { // CSS does not permit "none" for color
2342         p += sp_style_write_ipaint(p, c + BMAX - p, "color", &style->color, NULL, flags);
2343     }
2344
2345     p += sp_style_write_ipaint(p, c + BMAX - p, "fill", &style->fill, NULL, flags);
2346     // if fill:none, skip writing fill properties
2347     if (!style->fill.noneSet) {
2348         p += sp_style_write_iscale24(p, c + BMAX - p, "fill-opacity", &style->fill_opacity, NULL, flags);
2349         p += sp_style_write_ienum(p, c + BMAX - p, "fill-rule", enum_fill_rule, &style->fill_rule, NULL, flags);
2350     }
2351
2352     p += sp_style_write_ipaint(p, c + BMAX - p, "stroke", &style->stroke, NULL, flags);
2353
2354     // stroke width affects markers, so write it if there's stroke OR any markers
2355     if (!style->stroke.noneSet ||
2356         style->marker[SP_MARKER_LOC].set ||
2357         style->marker[SP_MARKER_LOC_START].set ||
2358         style->marker[SP_MARKER_LOC_MID].set ||
2359         style->marker[SP_MARKER_LOC_END].set) {
2360         p += sp_style_write_ilength(p, c + BMAX - p, "stroke-width", &style->stroke_width, NULL, flags);
2361     }
2362
2363     // if stroke:none, skip writing stroke properties
2364     if (!style->stroke.noneSet) {
2365         p += sp_style_write_ienum(p, c + BMAX - p, "stroke-linecap", enum_stroke_linecap, &style->stroke_linecap, NULL, flags);
2366         p += sp_style_write_ienum(p, c + BMAX - p, "stroke-linejoin", enum_stroke_linejoin, &style->stroke_linejoin, NULL, flags);
2367         p += sp_style_write_ifloat(p, c + BMAX - p, "stroke-miterlimit", &style->stroke_miterlimit, NULL, flags);
2368         p += sp_style_write_iscale24(p, c + BMAX - p, "stroke-opacity", &style->stroke_opacity, NULL, flags);
2369
2370         /** \todo fixme: */
2371         if ((flags == SP_STYLE_FLAG_ALWAYS)
2372             || style->stroke_dasharray_set)
2373         {
2374             if (style->stroke_dasharray_inherit) {
2375                 p += g_snprintf(p, c + BMAX - p, "stroke-dasharray:inherit;");
2376             } else if (style->stroke_dash.n_dash && style->stroke_dash.dash) {
2377                 p += g_snprintf(p, c + BMAX - p, "stroke-dasharray:");
2378                 gint i;
2379                 for (i = 0; i < style->stroke_dash.n_dash; i++) {
2380                     Inkscape::CSSOStringStream os;
2381                     if (i) {
2382                         os << ", ";
2383                     }
2384                     os << style->stroke_dash.dash[i];
2385                     p += g_strlcpy(p, os.str().c_str(), c + BMAX - p);
2386                 }
2387                 if (p < c + BMAX) {
2388                     *p++ = ';';
2389                 }
2390             } else {
2391                 p += g_snprintf(p, c + BMAX - p, "stroke-dasharray:none;");
2392             }
2393         }
2394
2395         /** \todo fixme: */
2396         if (style->stroke_dashoffset_set) {
2397             if (style->stroke_dashoffset_inherit) {
2398                 p += g_snprintf(p, c + BMAX - p, "stroke-dashoffset:inherit;");
2399             } else {
2400                 Inkscape::CSSOStringStream os;
2401                 os << "stroke-dashoffset:" << style->stroke_dash.offset << ";";
2402                 p += g_strlcpy(p, os.str().c_str(), c + BMAX - p);
2403             }
2404         } else if (flags == SP_STYLE_FLAG_ALWAYS) {
2405             p += g_snprintf(p, c + BMAX - p, "stroke-dashoffset:0;");
2406         }
2407     }
2408
2409     bool marker_none = false;
2410     gchar *master = style->marker[SP_MARKER_LOC].value;
2411     if (style->marker[SP_MARKER_LOC].set) {
2412         p += g_snprintf(p, c + BMAX - p, "marker:%s;", style->marker[SP_MARKER_LOC].value);
2413     } else if (flags == SP_STYLE_FLAG_ALWAYS) {
2414         p += g_snprintf(p, c + BMAX - p, "marker:none;");
2415         marker_none = true;
2416     }
2417     if (style->marker[SP_MARKER_LOC_START].set
2418        && (!master || strcmp(master, style->marker[SP_MARKER_LOC_START].value))) {
2419         p += g_snprintf(p, c + BMAX - p, "marker-start:%s;", style->marker[SP_MARKER_LOC_START].value);
2420     } else if (flags == SP_STYLE_FLAG_ALWAYS && !marker_none) {
2421         p += g_snprintf(p, c + BMAX - p, "marker-start:none;");
2422     }
2423     if (style->marker[SP_MARKER_LOC_MID].set
2424        && (!master || strcmp(master, style->marker[SP_MARKER_LOC_MID].value))) {
2425         p += g_snprintf(p, c + BMAX - p, "marker-mid:%s;", style->marker[SP_MARKER_LOC_MID].value);
2426     } else if (flags == SP_STYLE_FLAG_ALWAYS && !marker_none) {
2427         p += g_snprintf(p, c + BMAX - p, "marker-mid:none;");
2428     }
2429     if (style->marker[SP_MARKER_LOC_END].set
2430        && (!master || strcmp(master, style->marker[SP_MARKER_LOC_END].value))) {
2431         p += g_snprintf(p, c + BMAX - p, "marker-end:%s;", style->marker[SP_MARKER_LOC_END].value);
2432     } else if (flags == SP_STYLE_FLAG_ALWAYS && !marker_none) {
2433         p += g_snprintf(p, c + BMAX - p, "marker-end:none;");
2434     }
2435
2436     p += sp_style_write_ienum(p, c + BMAX - p, "visibility", enum_visibility, &style->visibility, NULL, flags);
2437     p += sp_style_write_ienum(p, c + BMAX - p, "display", enum_display, &style->display, NULL, flags);
2438     p += sp_style_write_ienum(p, c + BMAX - p, "overflow", enum_overflow, &style->overflow, NULL, flags);
2439
2440     /* filter: */
2441     p += sp_style_write_ifilter(p, c + BMAX - p, "filter", &style->filter, NULL, flags);
2442
2443     p += sp_style_write_ienum(p, c + BMAX - p, "enable-background", enum_enable_background, &style->enable_background, NULL, flags);
2444
2445     /* fixme: */
2446     p += sp_text_style_write(p, c + BMAX - p, style->text, flags);
2447
2448     /* Get rid of trailing `;'. */
2449     if (p != c) {
2450         --p;
2451         if (*p == ';') {
2452             *p = '\0';
2453         }
2454     }
2455
2456     return g_strdup(c);
2457 }
2458
2459
2460 #define STYLE_BUF_MAX
2461
2462
2463 /**
2464  * Dumps style to CSS string, see sp_style_write_string()
2465  *
2466  * \pre from != NULL.
2467  * \pre to != NULL.
2468  * \post ret != NULL.
2469  */
2470 gchar *
2471 sp_style_write_difference(SPStyle const *const from, SPStyle const *const to)
2472 {
2473     g_return_val_if_fail(from != NULL, NULL);
2474     g_return_val_if_fail(to != NULL, NULL);
2475
2476     gchar c[BMAX], *p = c;
2477     *p = '\0';
2478
2479     p += sp_style_write_ifontsize(p, c + BMAX - p, "font-size", &from->font_size, &to->font_size, SP_STYLE_FLAG_IFDIFF);
2480     p += sp_style_write_ienum(p, c + BMAX - p, "font-style", enum_font_style, &from->font_style, &to->font_style, SP_STYLE_FLAG_IFDIFF);
2481     p += sp_style_write_ienum(p, c + BMAX - p, "font-variant", enum_font_variant, &from->font_variant, &to->font_variant, SP_STYLE_FLAG_IFDIFF);
2482     p += sp_style_write_ienum(p, c + BMAX - p, "font-weight", enum_font_weight, &from->font_weight, &to->font_weight, SP_STYLE_FLAG_IFDIFF);
2483     p += sp_style_write_ienum(p, c + BMAX - p, "font-stretch", enum_font_stretch, &from->font_stretch, &to->font_stretch, SP_STYLE_FLAG_IFDIFF);
2484
2485     /* Text */
2486     p += sp_style_write_ilength(p, c + BMAX - p, "text-indent", &from->text_indent, &to->text_indent, SP_STYLE_FLAG_IFDIFF);
2487     p += sp_style_write_ienum(p, c + BMAX - p, "text-align", enum_text_align, &from->text_align, &to->text_align, SP_STYLE_FLAG_IFDIFF);
2488     p += sp_style_write_itextdecoration(p, c + BMAX - p, "text-decoration", &from->text_decoration, &to->text_decoration, SP_STYLE_FLAG_IFDIFF);
2489     p += sp_style_write_ilengthornormal(p, c + BMAX - p, "line-height", &from->line_height, &to->line_height, SP_STYLE_FLAG_IFDIFF);
2490     p += sp_style_write_ilengthornormal(p, c + BMAX - p, "letter-spacing", &from->letter_spacing, &to->letter_spacing, SP_STYLE_FLAG_IFDIFF);
2491     p += sp_style_write_ilengthornormal(p, c + BMAX - p, "word-spacing", &from->word_spacing, &to->word_spacing, SP_STYLE_FLAG_IFDIFF);
2492     p += sp_style_write_ienum(p, c + BMAX - p, "text-transform", enum_text_transform, &from->text_transform, &to->text_transform, SP_STYLE_FLAG_IFDIFF);
2493     p += sp_style_write_ienum(p, c + BMAX - p, "direction", enum_direction, &from->direction, &to->direction, SP_STYLE_FLAG_IFDIFF);
2494     p += sp_style_write_ienum(p, c + BMAX - p, "block-progression", enum_block_progression, &from->block_progression, &to->block_progression, SP_STYLE_FLAG_IFDIFF);
2495     p += sp_style_write_ienum(p, c + BMAX - p, "writing-mode", enum_writing_mode, &from->writing_mode, &to->writing_mode, SP_STYLE_FLAG_IFDIFF);
2496
2497     p += sp_style_write_ienum(p, c + BMAX - p, "text-anchor", enum_text_anchor, &from->text_anchor, &to->text_anchor, SP_STYLE_FLAG_IFDIFF);
2498     p += sp_style_write_ibaselineshift(p, c + BMAX - p, "baseline-shift", &from->baseline_shift, &to->baseline_shift, SP_STYLE_FLAG_IFDIFF);
2499
2500     /// \todo fixme: Per type methods need default flag too
2501     if (from->opacity.set && from->opacity.value != SP_SCALE24_MAX) {
2502         p += sp_style_write_iscale24(p, c + BMAX - p, "opacity", &from->opacity, &to->opacity, SP_STYLE_FLAG_IFSET);
2503     }
2504
2505     if (!from->color.noneSet) { // CSS does not permit "none" for color
2506         p += sp_style_write_ipaint(p, c + BMAX - p, "color", &from->color, &to->color, SP_STYLE_FLAG_IFSET);
2507     }
2508
2509     p += sp_style_write_ipaint(p, c + BMAX - p, "fill", &from->fill, &to->fill, SP_STYLE_FLAG_IFDIFF);
2510     // if fill:none, skip writing fill properties
2511     if (!from->fill.noneSet) {
2512         p += sp_style_write_iscale24(p, c + BMAX - p, "fill-opacity", &from->fill_opacity, &to->fill_opacity, SP_STYLE_FLAG_IFDIFF);
2513         p += sp_style_write_ienum(p, c + BMAX - p, "fill-rule", enum_fill_rule, &from->fill_rule, &to->fill_rule, SP_STYLE_FLAG_IFDIFF);
2514     }
2515
2516     p += sp_style_write_ipaint(p, c + BMAX - p, "stroke", &from->stroke, &to->stroke, SP_STYLE_FLAG_IFDIFF);
2517
2518     // stroke width affects markers, so write it if there's stroke OR any markers
2519     if (!from->stroke.noneSet ||
2520         from->marker[SP_MARKER_LOC].set ||
2521         from->marker[SP_MARKER_LOC_START].set ||
2522         from->marker[SP_MARKER_LOC_MID].set ||
2523         from->marker[SP_MARKER_LOC_END].set) {
2524         p += sp_style_write_ilength(p, c + BMAX - p, "stroke-width", &from->stroke_width, &to->stroke_width, SP_STYLE_FLAG_IFDIFF);
2525     }
2526
2527     // if stroke:none, skip writing stroke properties
2528     if (!from->stroke.noneSet) {
2529         p += sp_style_write_ienum(p, c + BMAX - p, "stroke-linecap", enum_stroke_linecap,
2530                                   &from->stroke_linecap, &to->stroke_linecap, SP_STYLE_FLAG_IFDIFF);
2531         p += sp_style_write_ienum(p, c + BMAX - p, "stroke-linejoin", enum_stroke_linejoin,
2532                                   &from->stroke_linejoin, &to->stroke_linejoin, SP_STYLE_FLAG_IFDIFF);
2533         p += sp_style_write_ifloat(p, c + BMAX - p, "stroke-miterlimit",
2534                                    &from->stroke_miterlimit, &to->stroke_miterlimit, SP_STYLE_FLAG_IFDIFF);
2535         /** \todo fixme: */
2536         if (from->stroke_dasharray_set) {
2537             if (from->stroke_dasharray_inherit) {
2538                 p += g_snprintf(p, c + BMAX - p, "stroke-dasharray:inherit;");
2539             } else if (from->stroke_dash.n_dash && from->stroke_dash.dash) {
2540                 p += g_snprintf(p, c + BMAX - p, "stroke-dasharray:");
2541                 for (gint i = 0; i < from->stroke_dash.n_dash; i++) {
2542                     Inkscape::CSSOStringStream os;
2543                     if (i) {
2544                         os << ", ";
2545                     }
2546                     os << from->stroke_dash.dash[i];
2547                     p += g_strlcpy(p, os.str().c_str(), c + BMAX - p);
2548                 }
2549                 p += g_snprintf(p, c + BMAX - p, ";");
2550             }
2551         }
2552         /* fixme: */
2553         if (from->stroke_dashoffset_set) {
2554             if (from->stroke_dashoffset_inherit) {
2555                 p += g_snprintf(p, c + BMAX - p, "stroke-dashoffset:inherit;");
2556             } else {
2557                 Inkscape::CSSOStringStream os;
2558                 os << "stroke-dashoffset:" << from->stroke_dash.offset << ";";
2559                 p += g_strlcpy(p, os.str().c_str(), c + BMAX - p);
2560             }
2561         }
2562         p += sp_style_write_iscale24(p, c + BMAX - p, "stroke-opacity", &from->stroke_opacity, &to->stroke_opacity, SP_STYLE_FLAG_IFDIFF);
2563     }
2564
2565     /* markers */
2566     gchar *master = from->marker[SP_MARKER_LOC].value;
2567     if (master != NULL) {
2568         p += g_snprintf(p, c + BMAX - p, "marker:%s;", master);
2569     }
2570     if (from->marker[SP_MARKER_LOC_START].value != NULL && (!master || strcmp(master, from->marker[SP_MARKER_LOC_START].value))) {
2571         p += g_snprintf(p, c + BMAX - p, "marker-start:%s;", from->marker[SP_MARKER_LOC_START].value);
2572     }
2573     if (from->marker[SP_MARKER_LOC_MID].value != NULL && (!master || strcmp(master, from->marker[SP_MARKER_LOC_MID].value))) {
2574         p += g_snprintf(p, c + BMAX - p, "marker-mid:%s;",   from->marker[SP_MARKER_LOC_MID].value);
2575     }
2576     if (from->marker[SP_MARKER_LOC_END].value != NULL && (!master || strcmp(master, from->marker[SP_MARKER_LOC_END].value))) {
2577         p += g_snprintf(p, c + BMAX - p, "marker-end:%s;",   from->marker[SP_MARKER_LOC_END].value);
2578     }
2579
2580     p += sp_style_write_ienum(p, c + BMAX - p, "visibility", enum_visibility, &from->visibility, &to->visibility, SP_STYLE_FLAG_IFSET);
2581     p += sp_style_write_ienum(p, c + BMAX - p, "display", enum_display, &from->display, &to->display, SP_STYLE_FLAG_IFSET);
2582     p += sp_style_write_ienum(p, c + BMAX - p, "overflow", enum_overflow, &from->overflow, &to->overflow, SP_STYLE_FLAG_IFSET);
2583
2584     /* filter: */
2585     p += sp_style_write_ifilter(p, c + BMAX - p, "filter", &from->filter, &to->filter, SP_STYLE_FLAG_IFDIFF);
2586
2587     p += sp_style_write_ienum(p, c + BMAX - p, "enable-background", enum_enable_background, &from->enable_background, &to->enable_background, SP_STYLE_FLAG_IFSET);
2588
2589     p += sp_text_style_write(p, c + BMAX - p, from->text, SP_STYLE_FLAG_IFDIFF);
2590
2591     /** \todo
2592      * The reason we use IFSET rather than IFDIFF is the belief that the IFDIFF
2593      * flag is mainly only for attributes that don't handle explicit unset well.
2594      * We may need to revisit the behaviour of this routine.
2595      */
2596
2597     /* Get rid of trailing `;'. */
2598     if (p != c) {
2599         --p;
2600         if (*p == ';') {
2601             *p = '\0';
2602         }
2603     }
2604
2605     return g_strdup(c);
2606 }
2607
2608
2609
2610 /**
2611  * Reset all style properties.
2612  */
2613 static void
2614 sp_style_clear(SPStyle *style)
2615 {
2616     g_return_if_fail(style != NULL);
2617
2618     style->fill.clear();
2619     style->stroke.clear();
2620     sp_style_filter_clear(style);
2621
2622     if (style->fill.value.href) {
2623         delete style->fill.value.href;
2624         style->fill.value.href = NULL;
2625     }
2626     if (style->stroke.value.href) {
2627         delete style->stroke.value.href;
2628         style->stroke.value.href = NULL;
2629     }
2630     if (style->filter.href) {
2631         delete style->filter.href;
2632         style->filter.href = NULL;
2633     }
2634
2635     if (style->stroke_dash.dash) {
2636         g_free(style->stroke_dash.dash);
2637     }
2638
2639     style->stroke_dasharray_inherit = FALSE;
2640     style->stroke_dashoffset_inherit = FALSE;
2641
2642     /** \todo fixme: Do that text manipulation via parents */
2643     SPObject *object = style->object;
2644     SPDocument *document = style->document;
2645     gint const refcount = style->refcount;
2646     SPTextStyle *text = style->text;
2647     unsigned const text_private = style->text_private;
2648
2649     memset(style, 0, sizeof(SPStyle));
2650
2651     style->refcount = refcount;
2652     style->object = object;
2653     style->document = document;
2654
2655     if (document) {
2656         style->filter.href = new SPFilterReference(document);
2657         style->filter.href->changedSignal().connect(sigc::bind(sigc::ptr_fun(sp_style_filter_ref_changed), style));
2658
2659         style->fill.value.href = new SPPaintServerReference(document);
2660         style->fill.value.href->changedSignal().connect(sigc::bind(sigc::ptr_fun(sp_style_fill_paint_server_ref_changed), style));
2661
2662         style->stroke.value.href = new SPPaintServerReference(document);
2663         style->stroke.value.href->changedSignal().connect(sigc::bind(sigc::ptr_fun(sp_style_stroke_paint_server_ref_changed), style));
2664     }
2665
2666     style->text = text;
2667     style->text_private = text_private;
2668
2669     style->text->font_specification.set = FALSE;
2670     style->text->font.set = FALSE;
2671     style->text->font_family.set = FALSE;
2672
2673     style->font_size.set = FALSE;
2674     style->font_size.type = SP_FONT_SIZE_LITERAL;
2675     style->font_size.value = SP_CSS_FONT_SIZE_MEDIUM;
2676     style->font_size.computed = 12.0;
2677     style->font_style.set = FALSE;
2678     style->font_style.value = style->font_style.computed = SP_CSS_FONT_STYLE_NORMAL;
2679     style->font_variant.set = FALSE;
2680     style->font_variant.value = style->font_variant.computed = SP_CSS_FONT_VARIANT_NORMAL;
2681     style->font_weight.set = FALSE;
2682     style->font_weight.value = SP_CSS_FONT_WEIGHT_NORMAL;
2683     style->font_weight.computed = SP_CSS_FONT_WEIGHT_400;
2684     style->font_stretch.set = FALSE;
2685     style->font_stretch.value = style->font_stretch.computed = SP_CSS_FONT_STRETCH_NORMAL;
2686
2687     /* text */
2688     style->text_indent.set = FALSE;
2689     style->text_indent.unit = SP_CSS_UNIT_NONE;
2690     style->text_indent.computed = 0.0;
2691
2692     style->text_align.set = FALSE;
2693     style->text_align.value = style->text_align.computed = SP_CSS_TEXT_ALIGN_START;
2694
2695     style->text_decoration.set = FALSE;
2696     style->text_decoration.underline = FALSE;
2697     style->text_decoration.overline = FALSE;
2698     style->text_decoration.line_through = FALSE;
2699     style->text_decoration.blink = FALSE;
2700
2701     style->line_height.set = FALSE;
2702     style->line_height.unit = SP_CSS_UNIT_PERCENT;
2703     style->line_height.normal = TRUE;
2704     style->line_height.value = style->line_height.computed = 1.0;
2705
2706     style->letter_spacing.set = FALSE;
2707     style->letter_spacing.unit = SP_CSS_UNIT_NONE;
2708     style->letter_spacing.normal = TRUE;
2709     style->letter_spacing.value = style->letter_spacing.computed = 0.0;
2710
2711     style->word_spacing.set = FALSE;
2712     style->word_spacing.unit = SP_CSS_UNIT_NONE;
2713     style->word_spacing.normal = TRUE;
2714     style->word_spacing.value = style->word_spacing.computed = 0.0;
2715
2716     style->baseline_shift.set = FALSE;
2717     style->baseline_shift.type = SP_BASELINE_SHIFT_LITERAL;
2718     style->baseline_shift.unit = SP_CSS_UNIT_NONE;
2719     style->baseline_shift.literal = SP_CSS_BASELINE_SHIFT_BASELINE;
2720     style->baseline_shift.value = 0.0;
2721     style->baseline_shift.computed = 0.0;
2722
2723     style->text_transform.set = FALSE;
2724     style->text_transform.value = style->text_transform.computed = SP_CSS_TEXT_TRANSFORM_NONE;
2725
2726     style->direction.set = FALSE;
2727     style->direction.value = style->direction.computed = SP_CSS_DIRECTION_LTR;
2728
2729     style->block_progression.set = FALSE;
2730     style->block_progression.value = style->block_progression.computed = SP_CSS_BLOCK_PROGRESSION_TB;
2731
2732     style->writing_mode.set = FALSE;
2733     style->writing_mode.value = style->writing_mode.computed = SP_CSS_WRITING_MODE_LR_TB;
2734
2735     style->text_anchor.set = FALSE;
2736     style->text_anchor.value = style->text_anchor.computed = SP_CSS_TEXT_ANCHOR_START;
2737
2738
2739     style->opacity.value = SP_SCALE24_MAX;
2740     style->visibility.set = FALSE;
2741     style->visibility.value = style->visibility.computed = SP_CSS_VISIBILITY_VISIBLE;
2742     style->display.set = FALSE;
2743     style->display.value = style->display.computed = SP_CSS_DISPLAY_INLINE;
2744     style->overflow.set = FALSE;
2745     style->overflow.value = style->overflow.computed = SP_CSS_OVERFLOW_VISIBLE;
2746
2747     style->color.clear();
2748     style->color.setColor(0.0, 0.0, 0.0);
2749
2750     style->fill.clear();
2751     style->fill.setColor(0.0, 0.0, 0.0);
2752     style->fill_opacity.value = SP_SCALE24_MAX;
2753     style->fill_rule.value = style->fill_rule.computed = SP_WIND_RULE_NONZERO;
2754
2755     style->stroke.clear();
2756     style->stroke_opacity.value = SP_SCALE24_MAX;
2757
2758     style->stroke_width.set = FALSE;
2759     style->stroke_width.unit = SP_CSS_UNIT_NONE;
2760     style->stroke_width.computed = 1.0;
2761
2762     style->stroke_linecap.set = FALSE;
2763     style->stroke_linecap.value = style->stroke_linecap.computed = SP_STROKE_LINECAP_BUTT;
2764     style->stroke_linejoin.set = FALSE;
2765     style->stroke_linejoin.value = style->stroke_linejoin.computed = SP_STROKE_LINEJOIN_MITER;
2766
2767     style->stroke_miterlimit.set = FALSE;
2768     style->stroke_miterlimit.value = 4.0;
2769
2770     style->stroke_dash.n_dash = 0;
2771     style->stroke_dash.dash = NULL;
2772     style->stroke_dash.offset = 0.0;
2773
2774     for (unsigned i = SP_MARKER_LOC; i < SP_MARKER_LOC_QTY; i++) {
2775         g_free(style->marker[i].value);
2776         style->marker[i].set = FALSE;
2777     }
2778
2779     style->enable_background.value = SP_CSS_BACKGROUND_ACCUMULATE;
2780     style->enable_background.set = false;
2781     style->enable_background.inherit = false;
2782 }
2783
2784
2785
2786 /**
2787  *
2788  */
2789 static void
2790 sp_style_read_dash(SPStyle *style, gchar const *str)
2791 {
2792     /* Ref: http://www.w3.org/TR/SVG11/painting.html#StrokeDasharrayProperty */
2793     style->stroke_dasharray_set = TRUE;
2794
2795     if (strcmp(str, "inherit") == 0) {
2796         style->stroke_dasharray_inherit = true;
2797         return;
2798     }
2799     style->stroke_dasharray_inherit = false;
2800
2801     NRVpathDash &dash = style->stroke_dash;
2802     g_free(dash.dash);
2803     dash.dash = NULL;
2804
2805     if (strcmp(str, "none") == 0) {
2806         dash.n_dash = 0;
2807         return;
2808     }
2809
2810     gint n_dash = 0;
2811     gdouble d[64];
2812     gchar *e = NULL;
2813
2814     bool LineSolid=true;
2815     while (e != str && n_dash < 64) {
2816         /* TODO: Should allow <length> rather than just a unitless (px) number. */
2817         d[n_dash] = g_ascii_strtod(str, (char **) &e);
2818         if (d[n_dash] > 0.00000001)
2819             LineSolid = false;
2820         if (e != str) {
2821             n_dash += 1;
2822             str = e;
2823         }
2824         while (str && *str && !isalnum(*str)) str += 1;
2825     }
2826
2827     if (LineSolid) {
2828         dash.n_dash = 0;
2829         return;
2830     }
2831
2832     if (n_dash > 0) {
2833         dash.dash = g_new(gdouble, n_dash);
2834         memcpy(dash.dash, d, sizeof(gdouble) * n_dash);
2835         dash.n_dash = n_dash;
2836     }
2837 }
2838
2839
2840 /*#########################
2841 ## SPTextStyle operations
2842 #########################*/
2843
2844
2845 /**
2846  * Return new SPTextStyle object with default settings.
2847  */
2848 static SPTextStyle *
2849 sp_text_style_new()
2850 {
2851     SPTextStyle *ts = g_new0(SPTextStyle, 1);
2852     ts->refcount = 1;
2853     sp_text_style_clear(ts);
2854
2855     ts->font_specification.value = g_strdup("Sans");
2856     ts->font.value = g_strdup("Sans");
2857     ts->font_family.value = g_strdup("Sans");
2858
2859     return ts;
2860 }
2861
2862
2863 /**
2864  * Clear text style settings.
2865  */
2866 static void
2867 sp_text_style_clear(SPTextStyle *ts)
2868 {
2869     ts->font_specification.set = FALSE;
2870     ts->font.set = FALSE;
2871     ts->font_family.set = FALSE;
2872 }
2873
2874
2875
2876 /**
2877  * Reduce refcount of text style and possibly free it.
2878  */
2879 static SPTextStyle *
2880 sp_text_style_unref(SPTextStyle *st)
2881 {
2882     st->refcount -= 1;
2883
2884     if (st->refcount < 1) {
2885         g_free(st->font_specification.value);
2886         g_free(st->font.value);
2887         g_free(st->font_family.value);
2888         g_free(st);
2889     }
2890
2891     return NULL;
2892 }
2893
2894
2895
2896 /**
2897  * Return duplicate of text style.
2898  */
2899 static SPTextStyle *
2900 sp_text_style_duplicate_unset(SPTextStyle *st)
2901 {
2902     SPTextStyle *nt = g_new0(SPTextStyle, 1);
2903     nt->refcount = 1;
2904
2905     nt->font_specification.value = g_strdup(st->font_specification.value);
2906     nt->font.value = g_strdup(st->font.value);
2907     nt->font_family.value = g_strdup(st->font_family.value);
2908
2909     return nt;
2910 }
2911
2912
2913
2914 /**
2915  * Write SPTextStyle object into string.
2916  */
2917 static guint
2918 sp_text_style_write(gchar *p, guint const len, SPTextStyle const *const st, guint flags)
2919 {
2920     gint d = 0;
2921
2922     // We do not do diffing for text style
2923     if (flags == SP_STYLE_FLAG_IFDIFF)
2924         flags = SP_STYLE_FLAG_IFSET;
2925
2926     d += sp_style_write_istring(p + d, len - d, "font-family", &st->font_family, NULL, flags);
2927     d += sp_style_write_istring(p + d, len - d, "-inkscape-font-specification", &st->font_specification, NULL, flags);
2928     return d;
2929 }
2930
2931
2932
2933 /* The following sp_tyle_read_* functions ignore invalid values, as per
2934  * http://www.w3.org/TR/REC-CSS2/syndata.html#parsing-errors.
2935  *
2936  * [However, the SVG spec is somewhat unclear as to whether the style attribute should
2937  * be handled as per CSS2 rules or whether it must simply be a set of PROPERTY:VALUE
2938  * pairs, in which case SVG's error-handling rules
2939  * http://www.w3.org/TR/SVG11/implnote.html#ErrorProcessing should instead be applied.]
2940  */
2941
2942
2943 /**
2944  * Set SPIFloat object from string.
2945  */
2946 static void
2947 sp_style_read_ifloat(SPIFloat *val, gchar const *str)
2948 {
2949     if (!strcmp(str, "inherit")) {
2950         val->set = TRUE;
2951         val->inherit = TRUE;
2952     } else {
2953         gfloat value;
2954         if (sp_svg_number_read_f(str, &value)) {
2955             val->set = TRUE;
2956             val->inherit = FALSE;
2957             val->value = value;
2958         }
2959     }
2960 }
2961
2962
2963
2964 /**
2965  * Set SPIScale24 object from string.
2966  */
2967 static void
2968 sp_style_read_iscale24(SPIScale24 *val, gchar const *str)
2969 {
2970     if (!strcmp(str, "inherit")) {
2971         val->set = TRUE;
2972         val->inherit = TRUE;
2973     } else {
2974         gfloat value;
2975         if (sp_svg_number_read_f(str, &value)) {
2976             val->set = TRUE;
2977             val->inherit = FALSE;
2978             value = CLAMP(value, 0.0, 1.0);
2979             val->value = SP_SCALE24_FROM_FLOAT(value);
2980         }
2981     }
2982 }
2983
2984 /**
2985  * Reads a style value and performs lookup based on the given style value enumerations.
2986  */
2987 static void
2988 sp_style_read_ienum(SPIEnum *val, gchar const *str, SPStyleEnum const *dict,
2989                     bool const can_explicitly_inherit)
2990 {
2991     if ( can_explicitly_inherit && !strcmp(str, "inherit") ) {
2992         val->set = TRUE;
2993         val->inherit = TRUE;
2994     } else {
2995         for (unsigned i = 0; dict[i].key; i++) {
2996             if (!strcmp(str, dict[i].key)) {
2997                 val->set = TRUE;
2998                 val->inherit = FALSE;
2999                 val->value = dict[i].value;
3000                 /* Save copying for values not needing it */
3001                 val->computed = val->value;
3002                 break;
3003             }
3004         }
3005     }
3006 }
3007
3008
3009
3010 /**
3011  * Set SPIString object from string.
3012  */
3013 static void
3014 sp_style_read_istring(SPIString *val, gchar const *str)
3015 {
3016     g_free(val->value);
3017
3018     if (!strcmp(str, "inherit")) {
3019         val->set = TRUE;
3020         val->inherit = TRUE;
3021         val->value = NULL;
3022     } else {
3023         val->set = TRUE;
3024         val->inherit = FALSE;
3025         val->value = g_strdup(str);
3026     }
3027 }
3028
3029
3030
3031 /**
3032  * Set SPILength object from string.
3033  */
3034 static void
3035 sp_style_read_ilength(SPILength *val, gchar const *str)
3036 {
3037     if (!strcmp(str, "inherit")) {
3038         val->set = TRUE;
3039         val->inherit = TRUE;
3040     } else {
3041         gdouble value;
3042         gchar *e;
3043         /** \todo fixme: Move this to standard place (Lauris) */
3044         value = g_ascii_strtod(str, &e);
3045         if ((gchar const *) e != str) {
3046             /** \todo
3047              * Allow the number of px per inch to vary (document preferences,
3048              * X server or whatever).  E.g. don't fill in computed here, do
3049              * it at the same time as percentage units are done.
3050              */
3051             if (!*e) {
3052                 /* Userspace */
3053                 val->unit = SP_CSS_UNIT_NONE;
3054                 val->computed = value;
3055             } else if (!strcmp(e, "px")) {
3056                 /* Userspace */
3057                 val->unit = SP_CSS_UNIT_PX;
3058                 val->computed = value;
3059             } else if (!strcmp(e, "pt")) {
3060                 /* Userspace / DEVICESCALE */
3061                 val->unit = SP_CSS_UNIT_PT;
3062                 val->computed = value * PX_PER_PT;
3063             } else if (!strcmp(e, "pc")) {
3064                 /* 1 pica = 12pt; FIXME: add it to SPUnit */
3065                 val->unit = SP_CSS_UNIT_PC;
3066                 val->computed = value * PX_PER_PT * 12;
3067             } else if (!strcmp(e, "mm")) {
3068                 val->unit = SP_CSS_UNIT_MM;
3069                 val->computed = value * PX_PER_MM;
3070             } else if (!strcmp(e, "cm")) {
3071                 val->unit = SP_CSS_UNIT_CM;
3072                 val->computed = value * PX_PER_CM;
3073             } else if (!strcmp(e, "in")) {
3074                 val->unit = SP_CSS_UNIT_IN;
3075                 val->computed = value * PX_PER_IN;
3076             } else if (!strcmp(e, "em")) {
3077                 /* EM square */
3078                 val->unit = SP_CSS_UNIT_EM;
3079                 val->value = value;
3080             } else if (!strcmp(e, "ex")) {
3081                 /* ex square */
3082                 val->unit = SP_CSS_UNIT_EX;
3083                 val->value = value;
3084             } else if (!strcmp(e, "%")) {
3085                 /* Percentage */
3086                 val->unit = SP_CSS_UNIT_PERCENT;
3087                 val->value = value * 0.01;
3088             } else {
3089                 /* Invalid */
3090                 return;
3091             }
3092             val->set = TRUE;
3093             val->inherit = FALSE;
3094         }
3095     }
3096 }
3097
3098 /**
3099  * Set SPILengthOrNormal object from string.
3100  */
3101 static void
3102 sp_style_read_ilengthornormal(SPILengthOrNormal *val, gchar const *str)
3103 {
3104     if (!strcmp(str, "normal")) {
3105         val->set = TRUE;
3106         val->inherit = FALSE;
3107         val->normal = TRUE;
3108         val->unit = SP_CSS_UNIT_NONE;
3109         val->value = val->computed = 0.0;
3110     } else {
3111         SPILength length;
3112         sp_style_read_ilength(&length, str);
3113         val->set = length.set;
3114         val->inherit = length.inherit;
3115         val->normal = FALSE;
3116         val->unit = length.unit;
3117         val->value = length.value;
3118         val->computed = length.computed;
3119     }
3120 }
3121
3122 /**
3123  * Set SPITextDecoration object from string.
3124  */
3125 static void
3126 sp_style_read_itextdecoration(SPITextDecoration *val, gchar const *str)
3127 {
3128     if (!strcmp(str, "inherit")) {
3129         val->set = TRUE;
3130         val->inherit = TRUE;
3131     } else if (!strcmp(str, "none")) {
3132         val->set = TRUE;
3133         val->inherit = FALSE;
3134         val->underline = FALSE;
3135         val->overline = FALSE;
3136         val->line_through = FALSE;
3137         val->blink = FALSE;
3138     } else {
3139         bool found_underline = false;
3140         bool found_overline = false;
3141         bool found_line_through = false;
3142         bool found_blink = false;
3143         for ( ; *str ; str++ ) {
3144             if (*str == ' ') continue;
3145             if (strneq(str, "underline", 9) && (str[9] == ' ' || str[9] == '\0')) {
3146                 found_underline = true;
3147                 str += 9;
3148             } else if (strneq(str, "overline", 8) && (str[8] == ' ' || str[8] == '\0')) {
3149                 found_overline = true;
3150                 str += 8;
3151             } else if (strneq(str, "line-through", 12) && (str[12] == ' ' || str[12] == '\0')) {
3152                 found_line_through = true;
3153                 str += 12;
3154             } else if (strneq(str, "blink", 5) && (str[5] == ' ' || str[5] == '\0')) {
3155                 found_blink = true;
3156                 str += 5;
3157             } else {
3158                 return;  // invalid value
3159             }
3160         }
3161         if (!(found_underline || found_overline || found_line_through || found_blink)) {
3162             return;  // invalid value: empty
3163         }
3164         val->set = TRUE;
3165         val->inherit = FALSE;
3166         val->underline = found_underline;
3167         val->overline = found_overline;
3168         val->line_through = found_line_through;
3169         val->blink = found_blink;
3170     }
3171 }
3172
3173 /**
3174  * Set SPIPaint object from string containing an integer value.
3175  * \param document Ignored
3176  */
3177 static void
3178 sp_style_read_icolor(SPIPaint *paint, gchar const *str, SPStyle *style, SPDocument *document)
3179 {
3180     (void)style; // TODO
3181     (void)document; // TODO
3182     paint->currentcolor = FALSE;  /* currentColor not a valid <color>. */
3183     if (!strcmp(str, "inherit")) {
3184         paint->set = TRUE;
3185         paint->inherit = TRUE;
3186     } else {
3187         guint32 const rgb0 = sp_svg_read_color(str, 0xff);
3188         if (rgb0 != 0xff) {
3189             paint->setColor(rgb0);
3190             paint->set = TRUE;
3191             paint->inherit = FALSE;
3192         }
3193     }
3194 }
3195
3196
3197 /**
3198  * Set SPIPaint object from string.
3199  *
3200  * \pre paint == \&style.fill || paint == \&style.stroke.
3201  */
3202 static void
3203 sp_style_read_ipaint(SPIPaint *paint, gchar const *str, SPStyle *style, SPDocument *document)
3204 {
3205     while (g_ascii_isspace(*str)) {
3206         ++str;
3207     }
3208
3209     paint->clear();
3210
3211     if (streq(str, "inherit")) {
3212         paint->set = TRUE;
3213         paint->inherit = TRUE;
3214     } else {
3215         if ( strneq(str, "url", 3) ) {
3216             gchar *uri = extract_uri( str, &str );
3217             while ( g_ascii_isspace(*str) ) {
3218                 ++str;
3219             }
3220             // TODO check on and comment the comparrison "paint != &style->color".
3221             if ( uri && *uri && (paint != &style->color) ) {
3222                 paint->set = TRUE;
3223
3224                 // it may be that this style's SPIPaint has not yet created its URIReference;
3225                 // now that we have a document, we can create it here
3226                 if (!paint->value.href && document) {
3227                     paint->value.href = new SPPaintServerReference(document);
3228                     paint->value.href->changedSignal().connect(sigc::bind(sigc::ptr_fun((paint == &style->fill)? sp_style_fill_paint_server_ref_changed : sp_style_stroke_paint_server_ref_changed), style));
3229                 }
3230
3231                 // TODO check what this does in light of move away from union
3232                 sp_style_set_ipaint_to_uri_string (style, paint, uri);
3233             }
3234             g_free( uri );
3235         }
3236
3237         if (streq(str, "currentColor") && paint != &style->color) {
3238             paint->set = TRUE;
3239             paint->currentcolor = TRUE;
3240         } else if (streq(str, "none") && paint != &style->color) {
3241             paint->set = TRUE;
3242             paint->noneSet = TRUE;
3243         } else {
3244             guint32 const rgb0 = sp_svg_read_color(str, &str, 0xff);
3245             if (rgb0 != 0xff) {
3246                 paint->setColor( rgb0 );
3247                 paint->set = TRUE;
3248
3249                 while (g_ascii_isspace(*str)) {
3250                     ++str;
3251                 }
3252                 if (strneq(str, "icc-color(", 10)) {
3253                     SVGICCColor* tmp = new SVGICCColor();
3254                     if ( ! sp_svg_read_icc_color( str, &str, tmp ) ) {
3255                         delete tmp;
3256                         tmp = 0;
3257                     }
3258                     paint->value.color.icc = tmp;
3259                 }
3260                 if (strneq(str, "device-gray(", 12) ||
3261                     strneq(str, "device-rgb(", 11) ||
3262                     strneq(str, "device-cmyk(", 12) ||
3263                     strneq(str, "device-nchannel(", 16)) {
3264                     SVGDeviceColor* tmp = new SVGDeviceColor();
3265                     if ( ! sp_svg_read_device_color( str, &str, tmp ) ) {
3266                         delete tmp;
3267                         tmp = 0;
3268                     }
3269                     paint->value.color.device = tmp;
3270                 }
3271             }
3272         }
3273     }
3274 }
3275
3276
3277
3278 /**
3279  * Set SPIFontSize object from string.
3280  */
3281 static void
3282 sp_style_read_ifontsize(SPIFontSize *val, gchar const *str)
3283 {
3284     if (!strcmp(str, "inherit")) {
3285         val->set = TRUE;
3286         val->inherit = TRUE;
3287     } else if ((*str == 'x') || (*str == 's') || (*str == 'm') || (*str == 'l')) {
3288         // xx-small, x-small, etc.
3289         for (unsigned i = 0; enum_font_size[i].key; i++) {
3290             if (!strcmp(str, enum_font_size[i].key)) {
3291                 val->set = TRUE;
3292                 val->inherit = FALSE;
3293                 val->type = SP_FONT_SIZE_LITERAL;
3294                 val->value = enum_font_size[i].value;
3295                 return;
3296             }
3297         }
3298         /* Invalid */
3299         return;
3300     } else {
3301         gdouble value;
3302         gchar *e;
3303         /* fixme: Move this to standard place (Lauris) */
3304         value = g_ascii_strtod(str, &e);
3305         if ((gchar const *) e != str) {
3306             if (!*e) {
3307                 /* Userspace */
3308             } else if (!strcmp(e, "px")) {
3309                 /* Userspace */
3310             } else if (!strcmp(e, "pt")) {
3311                 /* Userspace * DEVICESCALE */
3312                 value *= PX_PER_PT;
3313             } else if (!strcmp(e, "pc")) {
3314                 /* 12pt */
3315                 value *= PX_PER_PT * 12.0;
3316             } else if (!strcmp(e, "mm")) {
3317                 value *= PX_PER_MM;
3318             } else if (!strcmp(e, "cm")) {
3319                 value *= PX_PER_CM;
3320             } else if (!strcmp(e, "in")) {
3321                 value *= PX_PER_IN;
3322             } else if (!strcmp(e, "%")) {
3323                 /* Percentage */
3324                 val->set = TRUE;
3325                 val->inherit = FALSE;
3326                 val->type = SP_FONT_SIZE_PERCENTAGE;
3327                 val->value = SP_F8_16_FROM_FLOAT(value / 100.0);
3328                 return;
3329             } else {
3330                 /* Invalid */
3331                 return;
3332             }
3333             /* Length */
3334             val->set = TRUE;
3335             val->inherit = FALSE;
3336             val->type = SP_FONT_SIZE_LENGTH;
3337             val->computed = value;
3338             return;
3339         }
3340     }
3341 }
3342
3343
3344 /**
3345  * Set SPIBaselineShift object from string.
3346  */
3347 static void
3348 sp_style_read_ibaselineshift(SPIBaselineShift *val, gchar const *str)
3349 {
3350     if (!strcmp(str, "inherit")) {
3351         val->set = TRUE;
3352         val->inherit = TRUE;
3353     } else if ((*str == 'b') || (*str == 's')) {
3354         // baseline or sub or super
3355         for (unsigned i = 0; enum_baseline_shift[i].key; i++) {
3356             if (!strcmp(str, enum_baseline_shift[i].key)) {
3357                 val->set = TRUE;
3358                 val->inherit = FALSE;
3359                 val->type = SP_BASELINE_SHIFT_LITERAL;
3360                 val->literal = enum_baseline_shift[i].value;
3361                 return;
3362             }
3363         }
3364         /* Invalid */
3365         return;
3366     } else {
3367         SPILength length;
3368         sp_style_read_ilength(&length, str);
3369         val->set      = length.set;
3370         val->inherit  = length.inherit;
3371         val->unit     = length.unit;
3372         val->value    = length.value;
3373         val->computed = length.computed;
3374         if( val->unit == SP_CSS_UNIT_PERCENT ) {
3375             val->type = SP_BASELINE_SHIFT_PERCENTAGE;
3376         } else {
3377             val->type = SP_BASELINE_SHIFT_LENGTH;
3378         }
3379         return;
3380     }
3381 }
3382
3383
3384 /**
3385  * Set SPIFilter object from string.
3386  */
3387 static void
3388 sp_style_read_ifilter(gchar const *str, SPStyle * style, SPDocument *document)
3389 {
3390     SPIFilter *f = &(style->filter);
3391     /* Try all possible values: inherit, none, uri */
3392     if (streq(str, "inherit")) {
3393         f->set = TRUE;
3394         f->inherit = TRUE;
3395         if (f->href && f->href->getObject())
3396             f->href->detach();
3397     } else if(streq(str, "none")) {
3398         f->set = TRUE;
3399         f->inherit = FALSE;
3400         if (f->href && f->href->getObject())
3401            f->href->detach();
3402     } else if (strneq(str, "url", 3)) {
3403         char *uri = extract_uri(str);
3404         if(uri == NULL || uri[0] == '\0') {
3405             g_warning("Specified filter url is empty");
3406             f->set = TRUE;
3407             f->inherit = FALSE;
3408             return;
3409         }
3410         f->set = TRUE;
3411         f->inherit = FALSE;
3412         if (f->href && f->href->getObject())
3413             f->href->detach();
3414
3415         // it may be that this style has not yet created its SPFilterReference;
3416         // now that we have a document, we can create it here
3417         if (!f->href && document) {
3418             f->href = new SPFilterReference(document);
3419             f->href->changedSignal().connect(sigc::bind(sigc::ptr_fun(sp_style_filter_ref_changed), style));
3420         }
3421
3422         try {
3423             f->href->attach(Inkscape::URI(uri));
3424         } catch (Inkscape::BadURIException &e) {
3425             g_warning("%s", e.what());
3426             f->href->detach();
3427         }
3428         g_free (uri);
3429
3430     } else {
3431         /* We shouldn't reach this if SVG input is well-formed */
3432         f->set = FALSE;
3433         f->inherit = FALSE;
3434         if (f->href && f->href->getObject())
3435             f->href->detach();
3436     }
3437 }
3438
3439 /**
3440  * Set SPIEnum object from repr attribute.
3441  */
3442 static void
3443 sp_style_read_penum(SPIEnum *val, Inkscape::XML::Node *repr,
3444                     gchar const *key, SPStyleEnum const *dict,
3445                     bool const can_explicitly_inherit)
3446 {
3447     gchar const *str = repr->attribute(key);
3448     if (str) {
3449         sp_style_read_ienum(val, str, dict, can_explicitly_inherit);
3450     }
3451 }
3452
3453
3454
3455 /**
3456  * Set SPILength object from repr attribute.
3457  */
3458 static void
3459 sp_style_read_plength(SPILength *val, Inkscape::XML::Node *repr, gchar const *key)
3460 {
3461     gchar const *str = repr->attribute(key);
3462     if (str) {
3463         sp_style_read_ilength(val, str);
3464     }
3465 }
3466
3467 /**
3468  * Set SPIFontSize object from repr attribute.
3469  */
3470 static void
3471 sp_style_read_pfontsize(SPIFontSize *val, Inkscape::XML::Node *repr, gchar const *key)
3472 {
3473     gchar const *str = repr->attribute(key);
3474     if (str) {
3475         sp_style_read_ifontsize(val, str);
3476     }
3477 }
3478
3479
3480 /**
3481  * Set SPIBaselineShift object from repr attribute.
3482  */
3483 static void
3484 sp_style_read_pbaselineshift(SPIBaselineShift *val, Inkscape::XML::Node *repr, gchar const *key)
3485 {
3486     gchar const *str = repr->attribute(key);
3487     if (str) {
3488         sp_style_read_ibaselineshift(val, str);
3489     }
3490 }
3491
3492
3493 /**
3494  * Set SPIFloat object from repr attribute.
3495  */
3496 static void
3497 sp_style_read_pfloat(SPIFloat *val, Inkscape::XML::Node *repr, gchar const *key)
3498 {
3499     gchar const *str = repr->attribute(key);
3500     if (str) {
3501         sp_style_read_ifloat(val, str);
3502     }
3503 }
3504
3505
3506 /**
3507  * Write SPIFloat object into string.
3508  */
3509 static gint
3510 sp_style_write_ifloat(gchar *p, gint const len, gchar const *const key,
3511                       SPIFloat const *const val, SPIFloat const *const base, guint const flags)
3512 {
3513     Inkscape::CSSOStringStream os;
3514
3515     if ((flags & SP_STYLE_FLAG_ALWAYS)
3516         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
3517         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set
3518             && (!base->set || (val->value != base->value))))
3519     {
3520         if (val->inherit) {
3521             return g_snprintf(p, len, "%s:inherit;", key);
3522         } else {
3523             os << key << ":" << val->value << ";";
3524             return g_strlcpy(p, os.str().c_str(), len);
3525         }
3526     }
3527     return 0;
3528 }
3529
3530
3531 /**
3532  * Write SPIScale24 object into string.
3533  */
3534 static gint
3535 sp_style_write_iscale24(gchar *p, gint const len, gchar const *const key,
3536                         SPIScale24 const *const val, SPIScale24 const *const base,
3537                         guint const flags)
3538 {
3539     Inkscape::CSSOStringStream os;
3540
3541     if ((flags & SP_STYLE_FLAG_ALWAYS)
3542         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
3543         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set
3544             && (!base->set || (val->value != base->value))))
3545     {
3546         if (val->inherit) {
3547             return g_snprintf(p, len, "%s:inherit;", key);
3548         } else {
3549             os << key << ":" << SP_SCALE24_TO_FLOAT(val->value) << ";";
3550             return g_strlcpy(p, os.str().c_str(), len);
3551         }
3552     }
3553     return 0;
3554 }
3555
3556
3557 /**
3558  * Write SPIEnum object into string.
3559  */
3560 static gint
3561 sp_style_write_ienum(gchar *p, gint const len, gchar const *const key,
3562                      SPStyleEnum const *const dict,
3563                      SPIEnum const *const val, SPIEnum const *const base, guint const flags)
3564 {
3565     if ((flags & SP_STYLE_FLAG_ALWAYS)
3566         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
3567         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set
3568             && (!base->set || (val->computed != base->computed))))
3569     {
3570         if (val->inherit) {
3571             return g_snprintf(p, len, "%s:inherit;", key);
3572         }
3573         for (unsigned i = 0; dict[i].key; i++) {
3574             if (dict[i].value == static_cast< gint > (val->value) ) {
3575                 return g_snprintf(p, len, "%s:%s;", key, dict[i].key);
3576             }
3577         }
3578     }
3579     return 0;
3580 }
3581
3582
3583
3584 /**
3585  * Write SPIString object into string.
3586  */
3587 static gint
3588 sp_style_write_istring(gchar *p, gint const len, gchar const *const key,
3589                        SPIString const *const val, SPIString const *const base, guint const flags)
3590 {
3591     if ((flags & SP_STYLE_FLAG_ALWAYS)
3592         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
3593         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set
3594             && (!base->set || strcmp(val->value, base->value))))
3595     {
3596         if (val->inherit) {
3597             return g_snprintf(p, len, "%s:inherit;", key);
3598         } else {
3599             gchar *val_quoted = css2_escape_quote(val->value);
3600             if (val_quoted) {
3601                 return g_snprintf(p, len, "%s:%s;", key, val_quoted);
3602                 g_free (val_quoted);
3603             }
3604         }
3605     }
3606     return 0;
3607 }
3608
3609
3610 /**
3611  *
3612  */
3613 static bool
3614 sp_length_differ(SPILength const *const a, SPILength const *const b)
3615 {
3616     if (a->unit != b->unit) {
3617         if (a->unit == SP_CSS_UNIT_EM) return true;
3618         if (a->unit == SP_CSS_UNIT_EX) return true;
3619         if (a->unit == SP_CSS_UNIT_PERCENT) return true;
3620         if (b->unit == SP_CSS_UNIT_EM) return true;
3621         if (b->unit == SP_CSS_UNIT_EX) return true;
3622         if (b->unit == SP_CSS_UNIT_PERCENT) return true;
3623     }
3624
3625     return (a->computed != b->computed);
3626 }
3627
3628
3629
3630 /**
3631  * Write SPILength object into string.
3632  */
3633 static gint
3634 sp_style_write_ilength(gchar *p, gint const len, gchar const *const key,
3635                        SPILength const *const val, SPILength const *const base, guint const flags)
3636 {
3637     Inkscape::CSSOStringStream os;
3638
3639     if ((flags & SP_STYLE_FLAG_ALWAYS)
3640         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
3641         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set
3642             && (!base->set || sp_length_differ(val, base))))
3643     {
3644         if (val->inherit) {
3645             return g_snprintf(p, len, "%s:inherit;", key);
3646         } else {
3647             switch (val->unit) {
3648                 case SP_CSS_UNIT_NONE:
3649                     os << key << ":" << val->computed << ";";
3650                     return g_strlcpy(p, os.str().c_str(), len);
3651                     break;
3652                 case SP_CSS_UNIT_PX:
3653                     os << key << ":" << val->computed << "px;";
3654                     return g_strlcpy(p, os.str().c_str(), len);
3655                     break;
3656                 case SP_CSS_UNIT_PT:
3657                     os << key << ":" << val->computed * PT_PER_PX << "pt;";
3658                     return g_strlcpy(p, os.str().c_str(), len);
3659                     break;
3660                 case SP_CSS_UNIT_PC:
3661                     os << key << ":" << val->computed * PT_PER_PX / 12.0 << "pc;";
3662                     return g_strlcpy(p, os.str().c_str(), len);
3663                     break;
3664                 case SP_CSS_UNIT_MM:
3665                     os << key << ":" << val->computed * MM_PER_PX << "mm;";
3666                     return g_strlcpy(p, os.str().c_str(), len);
3667                     break;
3668                 case SP_CSS_UNIT_CM:
3669                     os << key << ":" << val->computed * CM_PER_PX << "cm;";
3670                     return g_strlcpy(p, os.str().c_str(), len);
3671                     break;
3672                 case SP_CSS_UNIT_IN:
3673                     os << key << ":" << val->computed * IN_PER_PX << "in;";
3674                     return g_strlcpy(p, os.str().c_str(), len);
3675                     break;
3676                 case SP_CSS_UNIT_EM:
3677                     os << key << ":" << val->value << "em;";
3678                     return g_strlcpy(p, os.str().c_str(), len);
3679                     break;
3680                 case SP_CSS_UNIT_EX:
3681                     os << key << ":" << val->value << "ex;";
3682                     return g_strlcpy(p, os.str().c_str(), len);
3683                     break;
3684                 case SP_CSS_UNIT_PERCENT:
3685                     os << key << ":" << (val->value * 100.0) << "%;";
3686                     return g_strlcpy(p, os.str().c_str(), len);
3687                     break;
3688                 default:
3689                     /* Invalid */
3690                     break;
3691             }
3692         }
3693     }
3694     return 0;
3695 }
3696
3697
3698 /**
3699  *
3700  */
3701 static bool
3702 sp_lengthornormal_differ(SPILengthOrNormal const *const a, SPILengthOrNormal const *const b)
3703 {
3704     if (a->normal != b->normal) return true;
3705     if (a->normal) return false;
3706
3707     if (a->unit != b->unit) {
3708         if (a->unit == SP_CSS_UNIT_EM) return true;
3709         if (a->unit == SP_CSS_UNIT_EX) return true;
3710         if (a->unit == SP_CSS_UNIT_PERCENT) return true;
3711         if (b->unit == SP_CSS_UNIT_EM) return true;
3712         if (b->unit == SP_CSS_UNIT_EX) return true;
3713         if (b->unit == SP_CSS_UNIT_PERCENT) return true;
3714     }
3715
3716     return (a->computed != b->computed);
3717 }
3718
3719 /**
3720  * Write SPILengthOrNormal object into string.
3721  */
3722 static gint
3723 sp_style_write_ilengthornormal(gchar *p, gint const len, gchar const *const key,
3724                                SPILengthOrNormal const *const val,
3725                                SPILengthOrNormal const *const base,
3726                                guint const flags)
3727 {
3728     if ((flags & SP_STYLE_FLAG_ALWAYS)
3729         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
3730         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set
3731             && (!base->set || sp_lengthornormal_differ(val, base))))
3732     {
3733         if (val->normal) {
3734             return g_snprintf(p, len, "%s:normal;", key);
3735         } else {
3736             SPILength length;
3737             length.set = val->set;
3738             length.inherit = val->inherit;
3739             length.unit = val->unit;
3740             length.value = val->value;
3741             length.computed = val->computed;
3742             return sp_style_write_ilength(p, len, key, &length, NULL, SP_STYLE_FLAG_ALWAYS);
3743         }
3744     }
3745     return 0;
3746 }
3747
3748 /**
3749  *
3750  */
3751 static bool
3752 sp_textdecoration_differ(SPITextDecoration const *const a, SPITextDecoration const *const b)
3753 {
3754     return    a->underline != b->underline
3755            || a->overline != b->overline
3756            || a->line_through != b->line_through
3757            || a->blink != b->blink;
3758 }
3759
3760 /**
3761  * Write SPITextDecoration object into string.
3762  */
3763 static gint
3764 sp_style_write_itextdecoration(gchar *p, gint const len, gchar const *const key,
3765                                SPITextDecoration const *const val,
3766                                SPITextDecoration const *const base,
3767                                guint const flags)
3768 {
3769     Inkscape::CSSOStringStream os;
3770
3771     if ((flags & SP_STYLE_FLAG_ALWAYS)
3772         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
3773         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set
3774             && (!base->set || sp_textdecoration_differ(val, base))))
3775     {
3776         if (val->inherit) {
3777             return g_snprintf(p, len, "%s:inherit;", key);
3778         } else {
3779             os << key << ":";
3780             if (val->underline || val->overline || val->line_through || val->blink) {
3781                 if (val->underline) os << " underline";
3782                 if (val->overline) os << " overline";
3783                 if (val->line_through) os << " line-through";
3784                 if (val->blink) os << " blink";
3785             } else
3786                 os << "none";
3787             os << ";";
3788             return g_strlcpy(p, os.str().c_str(), len);
3789         }
3790     }
3791     return 0;
3792 }
3793
3794 /**
3795  *
3796  */
3797 static bool
3798 sp_paint_differ(SPIPaint const *const a, SPIPaint const *const b)
3799 {
3800     if ( (a->isColor() != b->isColor())
3801          || (a->isPaintserver() != b->isPaintserver())
3802          || (a->set != b->set)
3803          || (a->currentcolor != b->currentcolor)
3804          || (a->inherit!= b->inherit) ) {
3805         return true;
3806     }
3807
3808     // TODO refactor to allow for mixed paints (rgb() *and* url(), etc)
3809
3810     if ( a->isPaintserver() ) {
3811         return (a->value.href == NULL || b->value.href == NULL || a->value.href->getObject() != b->value.href->getObject());
3812     }
3813
3814     if ( a->isColor() ) {
3815         return !( (a->value.color == b->value.color)
3816                  && ((a->value.color.icc == b->value.color.icc)
3817                      || (a->value.color.icc && b->value.color.icc
3818                          && (a->value.color.icc->colorProfile == b->value.color.icc->colorProfile)
3819                          && (a->value.color.icc->colors == b->value.color.icc->colors))));
3820     /* todo: Allow for epsilon differences in iccColor->colors, e.g. changes small enough not to show up
3821      * in the string representation. */
3822     }
3823
3824     return false;
3825 }
3826
3827
3828
3829 /**
3830  * Write SPIPaint object into string.
3831  */
3832 static gint
3833 sp_style_write_ipaint(gchar *b, gint const len, gchar const *const key,
3834                       SPIPaint const *const paint, SPIPaint const *const base, guint const flags)
3835 {
3836     int retval = 0;
3837
3838     if ((flags & SP_STYLE_FLAG_ALWAYS)
3839         || ((flags & SP_STYLE_FLAG_IFSET) && paint->set)
3840         || ((flags & SP_STYLE_FLAG_IFDIFF) && paint->set
3841             && (!base->set || sp_paint_differ(paint, base))))
3842     {
3843         CSSOStringStream css;
3844
3845         if (paint->inherit) {
3846             css << "inherit";
3847         } else {
3848             if ( paint->value.href && paint->value.href->getURI() ) {
3849                 const gchar* uri = paint->value.href->getURI()->toString();
3850                 css << "url(" << uri << ")";
3851             }
3852
3853             if ( paint->noneSet ) {
3854                 if ( !css.str().empty() ) {
3855                     css << " ";
3856                 }
3857                 css << "none";
3858             }
3859
3860             if ( paint->currentcolor ) {
3861                 if ( !css.str().empty() ) {
3862                     css << " ";
3863                 }
3864                 css << "currentColor";
3865             }
3866
3867             if ( paint->colorSet && !paint->currentcolor ) {
3868                 if ( !css.str().empty() ) {
3869                     css << " ";
3870                 }
3871                 char color_buf[8];
3872                 sp_svg_write_color(color_buf, sizeof(color_buf), paint->value.color.toRGBA32( 0 ));
3873                 css << color_buf;
3874             }
3875
3876             if (paint->value.color.icc && !paint->currentcolor) {
3877                 if ( !css.str().empty() ) {
3878                     css << " ";
3879                 }
3880                 css << "icc-color(" << paint->value.color.icc->colorProfile;
3881                 for (vector<double>::const_iterator i(paint->value.color.icc->colors.begin()),
3882                          iEnd(paint->value.color.icc->colors.end());
3883                      i != iEnd; ++i) {
3884                     css << ", " << *i;
3885                 }
3886                 css << ')';
3887             }
3888         }
3889
3890         if ( !css.str().empty() ) {
3891             retval = g_snprintf( b, len, "%s:%s;", key, css.str().c_str() );
3892         }
3893     }
3894
3895     return retval;
3896 }
3897
3898
3899 /**
3900  *
3901  */
3902 static bool
3903 sp_fontsize_differ(SPIFontSize const *const a, SPIFontSize const *const b)
3904 {
3905     if (a->type != b->type)
3906         return true;
3907     if (a->type == SP_FONT_SIZE_LENGTH) {
3908         if (a->computed != b->computed)
3909             return true;
3910     } else {
3911         if (a->value != b->value)
3912             return true;
3913     }
3914     return false;
3915 }
3916
3917
3918 /**
3919  * Write SPIFontSize object into string.
3920  */
3921 static gint
3922 sp_style_write_ifontsize(gchar *p, gint const len, gchar const *key,
3923                          SPIFontSize const *const val, SPIFontSize const *const base,
3924                          guint const flags)
3925 {
3926     if ((flags & SP_STYLE_FLAG_ALWAYS)
3927         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
3928         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set
3929             && (!base->set || sp_fontsize_differ(val, base))))
3930     {
3931         if (val->inherit) {
3932             return g_snprintf(p, len, "%s:inherit;", key);
3933         } else if (val->type == SP_FONT_SIZE_LITERAL) {
3934             for (unsigned i = 0; enum_font_size[i].key; i++) {
3935                 if (enum_font_size[i].value == static_cast< gint > (val->value) ) {
3936                     return g_snprintf(p, len, "%s:%s;", key, enum_font_size[i].key);
3937                 }
3938             }
3939         } else if (val->type == SP_FONT_SIZE_LENGTH) {
3940             Inkscape::CSSOStringStream os;
3941             os << key << ":" << val->computed << "px;";      // must specify px, see inkscape bug 1221626, mozilla bug 234789
3942             return g_strlcpy(p, os.str().c_str(), len);
3943         } else if (val->type == SP_FONT_SIZE_PERCENTAGE) {
3944             Inkscape::CSSOStringStream os;
3945             os << key << ":" << (SP_F8_16_TO_FLOAT(val->value) * 100.0) << "%;";
3946             return g_strlcpy(p, os.str().c_str(), len);
3947         }
3948     }
3949     return 0;
3950 }
3951
3952
3953 /*
3954  * baseline-shift is relative to parent. The only time it should
3955  * not be written out is if it is zero (or not set).
3956  */
3957 static bool
3958 sp_baseline_shift_notzero(SPIBaselineShift const *const a )
3959 {
3960     if( a->type == SP_BASELINE_SHIFT_LITERAL ) {
3961         if( a->literal == SP_CSS_BASELINE_SHIFT_BASELINE ) {
3962             return false;
3963         }
3964     } else {
3965         if( a->value == 0.0 ) {
3966             return false;
3967         }
3968     }
3969     return true;
3970 }
3971
3972 /**
3973  * Write SPIBaselineShift object into string.
3974  */
3975 static gint
3976 sp_style_write_ibaselineshift(gchar *p, gint const len, gchar const *key,
3977                               SPIBaselineShift const *const val, SPIBaselineShift const *const base,
3978                               guint const flags)
3979 {
3980     if ((flags & SP_STYLE_FLAG_ALWAYS)
3981         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
3982         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set
3983             && (!base->set || sp_baseline_shift_notzero(val) )))
3984     {
3985         if (val->inherit) {
3986             return g_snprintf(p, len, "%s:inherit;", key);
3987         } else if (val->type == SP_BASELINE_SHIFT_LITERAL) {
3988             for (unsigned i = 0; enum_baseline_shift[i].key; i++) {
3989                 if (enum_baseline_shift[i].value == static_cast< gint > (val->literal) ) {
3990                     return g_snprintf(p, len, "%s:%s;", key, enum_baseline_shift[i].key);
3991                 }
3992             }
3993         } else if (val->type == SP_BASELINE_SHIFT_LENGTH) {
3994             if( val->unit == SP_CSS_UNIT_EM || val->unit == SP_CSS_UNIT_EX ) {
3995                 Inkscape::CSSOStringStream os;
3996                 os << key << ":" << val->value << (val->unit == SP_CSS_UNIT_EM ? "em;" : "ex;");
3997                 return g_strlcpy(p, os.str().c_str(), len);
3998             } else {
3999                 Inkscape::CSSOStringStream os;
4000                 os << key << ":" << val->computed << "px;";      // must specify px, see inkscape bug 1221626, mozilla bug 234789
4001                 return g_strlcpy(p, os.str().c_str(), len);
4002             }
4003         } else if (val->type == SP_BASELINE_SHIFT_PERCENTAGE) {
4004             Inkscape::CSSOStringStream os;
4005             os << key << ":" << (val->value * 100.0) << "%;";
4006             return g_strlcpy(p, os.str().c_str(), len);
4007         }
4008     }
4009     return 0;
4010 }
4011
4012
4013
4014 /**
4015  * Write SPIFilter object into string.
4016  */
4017 static gint
4018 sp_style_write_ifilter(gchar *p, gint const len, gchar const *key,
4019                          SPIFilter const *const val, SPIFilter const *const base,
4020                          guint const flags)
4021 {
4022     (void)base; // TODO
4023     if ((flags & SP_STYLE_FLAG_ALWAYS)
4024         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
4025         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set))
4026     {
4027         if (val->inherit) {
4028             return g_snprintf(p, len, "%s:inherit;", key);
4029         } else if (val->href && val->href->getURI()) {
4030             return g_snprintf(p, len, "%s:url(%s);", key, val->href->getURI()->toString());
4031         }
4032     }
4033
4034
4035     return 0;
4036 }
4037
4038
4039 void SPIPaint::clear()
4040 {
4041     set = false;
4042     inherit = false;
4043     currentcolor = false;
4044     colorSet = false;
4045     noneSet = false;
4046     value.color.set( 0 );
4047     if ( value.href && value.href->getObject() )
4048     {
4049         value.href->detach();
4050     }
4051 }
4052
4053
4054 /**
4055  * Clear filter object, and disconnect style from paintserver (if present).
4056  */
4057 static void
4058 sp_style_filter_clear(SPStyle *style)
4059 {
4060     if (style->filter.href && style->filter.href->getObject())
4061         style->filter.href->detach();
4062 }
4063
4064
4065 // FIXME: Everything below this line belongs in a different file - css-chemistry?
4066
4067 void
4068 sp_style_set_property_url (SPObject *item, gchar const *property, SPObject *linked, bool recursive)
4069 {
4070     Inkscape::XML::Node *repr = SP_OBJECT_REPR(item);
4071
4072     if (repr == NULL) return;
4073
4074     SPCSSAttr *css = sp_repr_css_attr_new();
4075     if (linked) {
4076         gchar *val = g_strdup_printf("url(#%s)", linked->getId());
4077         sp_repr_css_set_property(css, property, val);
4078         g_free(val);
4079     } else {
4080         sp_repr_css_unset_property(css, "filter");
4081     }
4082
4083     if (recursive) {
4084         sp_repr_css_change_recursive(repr, css, "style");
4085     } else {
4086         sp_repr_css_change(repr, css, "style");
4087     }
4088     sp_repr_css_attr_unref(css);
4089 }
4090
4091
4092 /**
4093  * Clear all style property attributes in object.
4094  */
4095 void
4096 sp_style_unset_property_attrs(SPObject *o)
4097 {
4098     if (!o) return;
4099
4100     SPStyle *style = SP_OBJECT_STYLE(o);
4101     if (!style) return;
4102
4103     Inkscape::XML::Node *repr = SP_OBJECT_REPR(o);
4104     if (!repr) return;
4105
4106     if (style->opacity.set) {
4107         repr->setAttribute("opacity", NULL);
4108     }
4109     if (style->color.set) {
4110         repr->setAttribute("color", NULL);
4111     }
4112     if (style->fill.set) {
4113         repr->setAttribute("fill", NULL);
4114     }
4115     if (style->fill_opacity.set) {
4116         repr->setAttribute("fill-opacity", NULL);
4117     }
4118     if (style->fill_rule.set) {
4119         repr->setAttribute("fill-rule", NULL);
4120     }
4121     if (style->stroke.set) {
4122         repr->setAttribute("stroke", NULL);
4123     }
4124     if (style->stroke_width.set) {
4125         repr->setAttribute("stroke-width", NULL);
4126     }
4127     if (style->stroke_linecap.set) {
4128         repr->setAttribute("stroke-linecap", NULL);
4129     }
4130     if (style->stroke_linejoin.set) {
4131         repr->setAttribute("stroke-linejoin", NULL);
4132     }
4133     if (style->marker[SP_MARKER_LOC].set) {
4134         repr->setAttribute("marker", NULL);
4135     }
4136     if (style->marker[SP_MARKER_LOC_START].set) {
4137         repr->setAttribute("marker-start", NULL);
4138     }
4139     if (style->marker[SP_MARKER_LOC_MID].set) {
4140         repr->setAttribute("marker-mid", NULL);
4141     }
4142     if (style->marker[SP_MARKER_LOC_END].set) {
4143         repr->setAttribute("marker-end", NULL);
4144     }
4145     if (style->stroke_opacity.set) {
4146         repr->setAttribute("stroke-opacity", NULL);
4147     }
4148     if (style->stroke_dasharray_set) {
4149         repr->setAttribute("stroke-dasharray", NULL);
4150     }
4151     if (style->stroke_dashoffset_set) {
4152         repr->setAttribute("stroke-dashoffset", NULL);
4153     }
4154     if (style->text_private && style->text->font_specification.set) {
4155         repr->setAttribute("-inkscape-font-specification", NULL);
4156     }
4157     if (style->text_private && style->text->font_family.set) {
4158         repr->setAttribute("font-family", NULL);
4159     }
4160     if (style->text_anchor.set) {
4161         repr->setAttribute("text-anchor", NULL);
4162     }
4163     if (style->writing_mode.set) {
4164         repr->setAttribute("writing_mode", NULL);
4165     }
4166     if (style->filter.set) {
4167         repr->setAttribute("filter", NULL);
4168     }
4169     if (style->enable_background.set) {
4170         repr->setAttribute("enable-background", NULL);
4171     }
4172 }
4173
4174 /**
4175  * \pre style != NULL.
4176  * \pre flags in {IFSET, ALWAYS}.
4177  */
4178 SPCSSAttr *
4179 sp_css_attr_from_style(SPStyle const *const style, guint const flags)
4180 {
4181     g_return_val_if_fail(style != NULL, NULL);
4182     g_return_val_if_fail(((flags == SP_STYLE_FLAG_IFSET) ||
4183                           (flags == SP_STYLE_FLAG_ALWAYS)  ),
4184                          NULL);
4185     gchar *style_str = sp_style_write_string(style, flags);
4186     SPCSSAttr *css = sp_repr_css_attr_new();
4187     sp_repr_css_attr_add_from_string(css, style_str);
4188     g_free(style_str);
4189     return css;
4190 }
4191
4192
4193 /**
4194  * \pre object != NULL
4195  * \pre flags in {IFSET, ALWAYS}.
4196  */
4197 SPCSSAttr *
4198 sp_css_attr_from_object(SPObject *object, guint const flags)
4199 {
4200     g_return_val_if_fail(((flags == SP_STYLE_FLAG_IFSET) ||
4201                           (flags == SP_STYLE_FLAG_ALWAYS)  ),
4202                          NULL);
4203     SPStyle const *const style = SP_OBJECT_STYLE(object);
4204     if (style == NULL)
4205         return NULL;
4206     return sp_css_attr_from_style(style, flags);
4207 }
4208
4209 /**
4210  * Unset any text-related properties
4211  */
4212 SPCSSAttr *
4213 sp_css_attr_unset_text(SPCSSAttr *css)
4214 {
4215     sp_repr_css_set_property(css, "font", NULL); // not implemented yet
4216     sp_repr_css_set_property(css, "-inkscape-font-specification", NULL);
4217     sp_repr_css_set_property(css, "font-size", NULL);
4218     sp_repr_css_set_property(css, "font-size-adjust", NULL); // not implemented yet
4219     sp_repr_css_set_property(css, "font-style", NULL);
4220     sp_repr_css_set_property(css, "font-variant", NULL);
4221     sp_repr_css_set_property(css, "font-weight", NULL);
4222     sp_repr_css_set_property(css, "font-stretch", NULL);
4223     sp_repr_css_set_property(css, "font-family", NULL);
4224     sp_repr_css_set_property(css, "text-indent", NULL);
4225     sp_repr_css_set_property(css, "text-align", NULL);
4226     sp_repr_css_set_property(css, "text-decoration", NULL);
4227     sp_repr_css_set_property(css, "line-height", NULL);
4228     sp_repr_css_set_property(css, "letter-spacing", NULL);
4229     sp_repr_css_set_property(css, "word-spacing", NULL);
4230     sp_repr_css_set_property(css, "text-transform", NULL);
4231     sp_repr_css_set_property(css, "direction", NULL);
4232     sp_repr_css_set_property(css, "block-progression", NULL);
4233     sp_repr_css_set_property(css, "writing-mode", NULL);
4234     sp_repr_css_set_property(css, "text-anchor", NULL);
4235     sp_repr_css_set_property(css, "kerning", NULL); // not implemented yet
4236     sp_repr_css_set_property(css, "dominant-baseline", NULL); // not implemented yet
4237     sp_repr_css_set_property(css, "alignment-baseline", NULL); // not implemented yet
4238     sp_repr_css_set_property(css, "baseline-shift", NULL);
4239
4240     return css;
4241 }
4242
4243 bool
4244 is_url(char const *p)
4245 {
4246     if (p == NULL)
4247         return false;
4248 /** \todo
4249  * FIXME: I'm not sure if this applies to SVG as well, but CSS2 says any URIs
4250  * in property values must start with 'url('.
4251  */
4252     return (g_ascii_strncasecmp(p, "url(", 4) == 0);
4253 }
4254
4255 /**
4256  * Unset any properties that contain URI values.
4257  *
4258  * Used for storing style that will be reused across documents when carrying
4259  * the referenced defs is impractical.
4260  */
4261 SPCSSAttr *
4262 sp_css_attr_unset_uris(SPCSSAttr *css)
4263 {
4264 // All properties that may hold <uri> or <paint> according to SVG 1.1
4265     if (is_url(sp_repr_css_property(css, "clip-path", NULL))) sp_repr_css_set_property(css, "clip-path", NULL);
4266     if (is_url(sp_repr_css_property(css, "color-profile", NULL))) sp_repr_css_set_property(css, "color-profile", NULL);
4267     if (is_url(sp_repr_css_property(css, "cursor", NULL))) sp_repr_css_set_property(css, "cursor", NULL);
4268     if (is_url(sp_repr_css_property(css, "filter", NULL))) sp_repr_css_set_property(css, "filter", NULL);
4269     if (is_url(sp_repr_css_property(css, "marker", NULL))) sp_repr_css_set_property(css, "marker", NULL);
4270     if (is_url(sp_repr_css_property(css, "marker-start", NULL))) sp_repr_css_set_property(css, "marker-start", NULL);
4271     if (is_url(sp_repr_css_property(css, "marker-mid", NULL))) sp_repr_css_set_property(css, "marker-mid", NULL);
4272     if (is_url(sp_repr_css_property(css, "marker-end", NULL))) sp_repr_css_set_property(css, "marker-end", NULL);
4273     if (is_url(sp_repr_css_property(css, "mask", NULL))) sp_repr_css_set_property(css, "mask", NULL);
4274     if (is_url(sp_repr_css_property(css, "fill", NULL))) sp_repr_css_set_property(css, "fill", NULL);
4275     if (is_url(sp_repr_css_property(css, "stroke", NULL))) sp_repr_css_set_property(css, "stroke", NULL);
4276
4277     return css;
4278 }
4279
4280 /**
4281  * Scale a single-value property.
4282  */
4283 void
4284 sp_css_attr_scale_property_single(SPCSSAttr *css, gchar const *property,
4285                                   double ex, bool only_with_units = false)
4286 {
4287     gchar const *w = sp_repr_css_property(css, property, NULL);
4288     if (w) {
4289         gchar *units = NULL;
4290         double wd = g_ascii_strtod(w, &units) * ex;
4291         if (w == units) {// nothing converted, non-numeric value
4292             return;
4293         }
4294         if (only_with_units && (units == NULL || *units == '\0' || *units == '%')) {
4295             // only_with_units, but no units found, so do nothing.
4296             return;
4297         }
4298         Inkscape::CSSOStringStream os;
4299         os << wd << units; // reattach units
4300         sp_repr_css_set_property(css, property, os.str().c_str());
4301     }
4302 }
4303
4304 /**
4305  * Scale a list-of-values property.
4306  */
4307 void
4308 sp_css_attr_scale_property_list(SPCSSAttr *css, gchar const *property, double ex)
4309 {
4310     gchar const *string = sp_repr_css_property(css, property, NULL);
4311     if (string) {
4312         Inkscape::CSSOStringStream os;
4313         gchar **a = g_strsplit(string, ",", 10000);
4314         bool first = true;
4315         for (gchar **i = a; i != NULL; i++) {
4316             gchar *w = *i;
4317             if (w == NULL)
4318                 break;
4319             gchar *units = NULL;
4320             double wd = g_ascii_strtod(w, &units) * ex;
4321             if (w == units) {// nothing converted, non-numeric value ("none" or "inherit"); do nothing
4322                 g_strfreev(a);
4323                 return;
4324             }
4325             if (!first) {
4326                 os << ",";
4327             }
4328             os << wd << units; // reattach units
4329             first = false;
4330         }
4331         sp_repr_css_set_property(css, property, os.str().c_str());
4332         g_strfreev(a);
4333     }
4334 }
4335
4336 /**
4337  * Scale any properties that may hold <length> by ex.
4338  */
4339 SPCSSAttr *
4340 sp_css_attr_scale(SPCSSAttr *css, double ex)
4341 {
4342     sp_css_attr_scale_property_single(css, "baseline-shift", ex);
4343     sp_css_attr_scale_property_single(css, "stroke-width", ex);
4344     sp_css_attr_scale_property_list   (css, "stroke-dasharray", ex);
4345     sp_css_attr_scale_property_single(css, "stroke-dashoffset", ex);
4346     sp_css_attr_scale_property_single(css, "font-size", ex);
4347     sp_css_attr_scale_property_single(css, "kerning", ex);
4348     sp_css_attr_scale_property_single(css, "letter-spacing", ex);
4349     sp_css_attr_scale_property_single(css, "word-spacing", ex);
4350     sp_css_attr_scale_property_single(css, "line-height", ex, true);
4351
4352     return css;
4353 }
4354
4355
4356 /**
4357  * Remove quotes and escapes from a string. Returned value must be g_free'd.
4358  * Note: in CSS (in style= and in stylesheets), unquoting and unescaping is done
4359  * by libcroco, our CSS parser, though it adds a new pair of "" quotes for the strings
4360  * it parsed for us. So this function is only used to remove those quotes and for
4361  * presentation attributes, without any unescaping. (XML unescaping
4362  * (&amp; etc) is done by XML parser.)
4363  */
4364 gchar *
4365 attribute_unquote(gchar const *val)
4366 {
4367     if (val) {
4368         if (*val == '\'' || *val == '"') {
4369             int l = strlen(val);
4370             if (l >= 2) {
4371                 if ( ( val[0] == '"' && val[l - 1] == '"' )  ||
4372                      ( val[0] == '\'' && val[l - 1] == '\'' )  ) {
4373                     return (g_strndup (val+1, l-2));
4374                 }
4375             }
4376         }
4377     }
4378
4379     return (val? g_strdup (val) : NULL);
4380 }
4381
4382 /**
4383  * Quote and/or escape string for writing to CSS (style=). Returned value must be g_free'd.
4384  */
4385 gchar *
4386 css2_escape_quote(gchar const *val) {
4387
4388     Glib::ustring t;
4389     bool quote = false;
4390     bool last_was_space = false;
4391
4392     for (gchar const *i = val; *i; i++) {
4393         bool is_space = ( *i == ' ' );
4394         if (g_ascii_isalnum(*i) || *i=='-' || *i=='_') {
4395             // ASCII alphanumeric, - and _ don't require quotes
4396             t.push_back(*i);
4397         } else if ( is_space && !last_was_space ) {
4398             // non-consecutive spaces don't require quotes
4399             t.push_back(*i);
4400         } else if (*i=='\'') {
4401             // single quotes require escaping and quotes
4402             t.push_back('\\');
4403             t.push_back(*i);
4404             quote = true;
4405         } else {
4406             // everything else requires quotes
4407             t.push_back(*i);
4408             quote = true;
4409         }
4410         if (i == val && !g_ascii_isalpha(*i)) {
4411             // a non-ASCII/non-alpha initial character requires quotes
4412             quote = true;
4413         }
4414         last_was_space = is_space;
4415     }
4416
4417     if (last_was_space) {
4418         // a trailing space requires quotes
4419         quote = true;
4420     }
4421
4422     if (quote) {
4423         // we use single quotes so the result can be stored in an XML
4424         // attribute without incurring un-aesthetic additional quoting
4425         // (our XML emitter always uses double quotes)
4426         t.insert(t.begin(), '\'');
4427         t.push_back('\'');
4428     }
4429
4430     return (t.empty() ? NULL : g_strdup (t.c_str()));
4431 }
4432
4433 /*
4434   Local Variables:
4435   mode:c++
4436   c-file-style:"stroustrup"
4437   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
4438   indent-tabs-mode:nil
4439   fill-column:99
4440   End:
4441 */
4442 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :