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[inkscape.git] / src / style.cpp
1 /** @file
2  * @brief SVG stylesheets implementation.
3  */
4 /* Authors:
5  *   Lauris Kaplinski <lauris@kaplinski.com>
6  *   Peter Moulder <pmoulder@mail.csse.monash.edu.au>
7  *   bulia byak <buliabyak@users.sf.net>
8  *   Abhishek Sharma
9  *
10  * Copyright (C) 2001-2002 Lauris Kaplinski
11  * Copyright (C) 2001 Ximian, Inc.
12  * Copyright (C) 2005 Monash University
13  *
14  * Released under GNU GPL, read the file 'COPYING' for more information
15  */
17 #ifdef HAVE_CONFIG_H
18 # include "config.h"
19 #endif
21 #include <cstring>
22 #include <string>
24 #include "libcroco/cr-sel-eng.h"
25 #include "xml/croco-node-iface.h"
27 #include "svg/svg.h"
28 #include "svg/svg-color.h"
29 #include "svg/svg-icc-color.h"
31 #include "display/canvas-bpath.h"
32 #include "attributes.h"
33 #include "document.h"
34 #include "extract-uri.h"
35 #include "uri-references.h"
36 #include "uri.h"
37 #include "sp-paint-server.h"
38 #include "streq.h"
39 #include "strneq.h"
40 #include "style.h"
41 #include "svg/css-ostringstream.h"
42 #include "xml/repr.h"
43 #include "xml/simple-document.h"
44 #include "unit-constants.h"
45 #include "2geom/isnan.h"
46 #include "macros.h"
47 #include "preferences.h"
49 #include "sp-filter-reference.h"
51 #include <sigc++/functors/ptr_fun.h>
52 #include <sigc++/adaptors/bind.h>
54 using Inkscape::CSSOStringStream;
55 using std::vector;
57 #define BMAX 8192
59 class SPStyleEnum;
61 /*#########################
62 ## FORWARD DECLARATIONS
63 #########################*/
64 static void sp_style_clear(SPStyle *style);
66 static void sp_style_merge_property(SPStyle *style, gint id, gchar const *val);
68 static void sp_style_merge_ipaint(SPStyle *style, SPIPaint *paint, SPIPaint const *parent);
69 static void sp_style_merge_ifilter(SPStyle *style, SPIFilter const *parent);
70 static void sp_style_read_dash(SPStyle *style, gchar const *str);
72 static SPTextStyle *sp_text_style_new(void);
73 static void sp_text_style_clear(SPTextStyle *ts);
74 static SPTextStyle *sp_text_style_unref(SPTextStyle *st);
75 static SPTextStyle *sp_text_style_duplicate_unset(SPTextStyle *st);
76 static guint sp_text_style_write(gchar *p, guint len, SPTextStyle const *st, guint flags = SP_STYLE_FLAG_IFSET);
77 static void sp_style_privatize_text(SPStyle *style);
79 static void sp_style_read_ifloat(SPIFloat *val, gchar const *str);
80 static void sp_style_read_iscale24(SPIScale24 *val, gchar const *str);
81 static void sp_style_read_ienum(SPIEnum *val, gchar const *str, SPStyleEnum const *dict, bool can_explicitly_inherit);
82 static void sp_style_read_istring(SPIString *val, gchar const *str);
83 static void sp_style_read_ilength(SPILength *val, gchar const *str);
84 static void sp_style_read_ilengthornormal(SPILengthOrNormal *val, gchar const *str);
85 static void sp_style_read_itextdecoration(SPITextDecoration *val, gchar const *str);
86 static void sp_style_read_icolor(SPIPaint *paint, gchar const *str, SPStyle *style, SPDocument *document);
87 static void sp_style_read_ifontsize(SPIFontSize *val, gchar const *str);
88 static void sp_style_read_ibaselineshift(SPIBaselineShift *val, gchar const *str);
89 static void sp_style_read_ifilter(gchar const *str, SPStyle *style, SPDocument *document);
91 static void sp_style_read_penum(SPIEnum *val, Inkscape::XML::Node *repr, gchar const *key, SPStyleEnum const *dict, bool can_explicitly_inherit);
92 static void sp_style_read_plength(SPILength *val, Inkscape::XML::Node *repr, gchar const *key);
93 static void sp_style_read_pfontsize(SPIFontSize *val, Inkscape::XML::Node *repr, gchar const *key);
94 static void sp_style_read_pbaselineshift(SPIBaselineShift *val, Inkscape::XML::Node *repr, gchar const *key);
95 static void sp_style_read_pfloat(SPIFloat *val, Inkscape::XML::Node *repr, gchar const *key);
97 static gint sp_style_write_ifloat(gchar *p, gint len, gchar const *key, SPIFloat const *val, SPIFloat const *base, guint flags);
98 static gint sp_style_write_iscale24(gchar *p, gint len, gchar const *key, SPIScale24 const *val, SPIScale24 const *base, guint flags);
99 static gint sp_style_write_ienum(gchar *p, gint len, gchar const *key, SPStyleEnum const *dict, SPIEnum const *val, SPIEnum const *base, guint flags);
100 static gint sp_style_write_istring(gchar *p, gint len, gchar const *key, SPIString const *val, SPIString const *base, guint flags);
101 static gint sp_style_write_ilength(gchar *p, gint len, gchar const *key, SPILength const *val, SPILength const *base, guint flags);
102 static gint sp_style_write_ipaint(gchar *b, gint len, gchar const *key, SPIPaint const *paint, SPIPaint const *base, guint flags);
103 static gint sp_style_write_ifontsize(gchar *p, gint len, gchar const *key, SPIFontSize const *val, SPIFontSize const *base, guint flags);
104 static gint sp_style_write_ibaselineshift(gchar *p, gint len, gchar const *key, SPIBaselineShift const *val, SPIBaselineShift const *base, guint flags);
105 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);
106 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);
107 static gint sp_style_write_ifilter(gchar *b, gint len, gchar const *key, SPIFilter const *filter, SPIFilter const *base, guint flags);
109 static void sp_style_filter_clear(SPStyle *style);
111 #define SPS_READ_IENUM_IF_UNSET(v,s,d,i) if (!(v)->set) {sp_style_read_ienum((v), (s), (d), (i));}
112 #define SPS_READ_PENUM_IF_UNSET(v,r,k,d,i) if (!(v)->set) {sp_style_read_penum((v), (r), (k), (d), (i));}
114 #define SPS_READ_ILENGTH_IF_UNSET(v,s) if (!(v)->set) {sp_style_read_ilength((v), (s));}
115 #define SPS_READ_PLENGTH_IF_UNSET(v,r,k) if (!(v)->set) {sp_style_read_plength((v), (r), (k));}
117 #define SPS_READ_PFLOAT_IF_UNSET(v,r,k) if (!(v)->set) {sp_style_read_pfloat((v), (r), (k));}
119 #define SPS_READ_IFONTSIZE_IF_UNSET(v,s) if (!(v)->set) {sp_style_read_ifontsize((v), (s));}
120 #define SPS_READ_PFONTSIZE_IF_UNSET(v,r,k) if (!(v)->set) {sp_style_read_pfontsize((v), (r), (k));}
122 #define SPS_READ_IBASELINE_SHIFT_IF_UNSET(v,s) if (!(v)->set) {sp_style_read_ibaselineshift((v), (s));}
123 #define SPS_READ_PBASELINE_SHIFT_IF_UNSET(v,r,k) if (!(v)->set) {sp_style_read_pbaselineshift((v), (r), (k));}
125 static void sp_style_merge_from_object_stylesheet(SPStyle *, SPObject const *);
127 struct SPStyleEnum {
128     gchar const *key;
129     gint value;
130 };
132 static SPStyleEnum const enum_fill_rule[] = {
133     {"nonzero", SP_WIND_RULE_NONZERO},
134     {"evenodd", SP_WIND_RULE_EVENODD},
135     {NULL, -1}
136 };
138 static SPStyleEnum const enum_stroke_linecap[] = {
139     {"butt", SP_STROKE_LINECAP_BUTT},
140     {"round", SP_STROKE_LINECAP_ROUND},
141     {"square", SP_STROKE_LINECAP_SQUARE},
142     {NULL, -1}
143 };
145 static SPStyleEnum const enum_stroke_linejoin[] = {
146     {"miter", SP_STROKE_LINEJOIN_MITER},
147     {"round", SP_STROKE_LINEJOIN_ROUND},
148     {"bevel", SP_STROKE_LINEJOIN_BEVEL},
149     {NULL, -1}
150 };
152 static SPStyleEnum const enum_font_style[] = {
153     {"normal", SP_CSS_FONT_STYLE_NORMAL},
154     {"italic", SP_CSS_FONT_STYLE_ITALIC},
155     {"oblique", SP_CSS_FONT_STYLE_OBLIQUE},
156     {NULL, -1}
157 };
159 static SPStyleEnum const enum_font_size[] = {
160     {"xx-small", SP_CSS_FONT_SIZE_XX_SMALL},
161     {"x-small", SP_CSS_FONT_SIZE_X_SMALL},
162     {"small", SP_CSS_FONT_SIZE_SMALL},
163     {"medium", SP_CSS_FONT_SIZE_MEDIUM},
164     {"large", SP_CSS_FONT_SIZE_LARGE},
165     {"x-large", SP_CSS_FONT_SIZE_X_LARGE},
166     {"xx-large", SP_CSS_FONT_SIZE_XX_LARGE},
167     {"smaller", SP_CSS_FONT_SIZE_SMALLER},
168     {"larger", SP_CSS_FONT_SIZE_LARGER},
169     {NULL, -1}
170 };
172 static SPStyleEnum const enum_font_variant[] = {
173     {"normal", SP_CSS_FONT_VARIANT_NORMAL},
174     {"small-caps", SP_CSS_FONT_VARIANT_SMALL_CAPS},
175     {NULL, -1}
176 };
178 static SPStyleEnum const enum_font_weight[] = {
179     {"100", SP_CSS_FONT_WEIGHT_100},
180     {"200", SP_CSS_FONT_WEIGHT_200},
181     {"300", SP_CSS_FONT_WEIGHT_300},
182     {"400", SP_CSS_FONT_WEIGHT_400},
183     {"500", SP_CSS_FONT_WEIGHT_500},
184     {"600", SP_CSS_FONT_WEIGHT_600},
185     {"700", SP_CSS_FONT_WEIGHT_700},
186     {"800", SP_CSS_FONT_WEIGHT_800},
187     {"900", SP_CSS_FONT_WEIGHT_900},
188     {"normal", SP_CSS_FONT_WEIGHT_NORMAL},
189     {"bold", SP_CSS_FONT_WEIGHT_BOLD},
190     {"lighter", SP_CSS_FONT_WEIGHT_LIGHTER},
191     {"bolder", SP_CSS_FONT_WEIGHT_BOLDER},
192     {NULL, -1}
193 };
195 static SPStyleEnum const enum_font_stretch[] = {
196     {"ultra-condensed", SP_CSS_FONT_STRETCH_ULTRA_CONDENSED},
197     {"extra-condensed", SP_CSS_FONT_STRETCH_EXTRA_CONDENSED},
198     {"condensed", SP_CSS_FONT_STRETCH_CONDENSED},
199     {"semi-condensed", SP_CSS_FONT_STRETCH_SEMI_CONDENSED},
200     {"normal", SP_CSS_FONT_STRETCH_NORMAL},
201     {"semi-expanded", SP_CSS_FONT_STRETCH_SEMI_EXPANDED},
202     {"expanded", SP_CSS_FONT_STRETCH_EXPANDED},
203     {"extra-expanded", SP_CSS_FONT_STRETCH_EXTRA_EXPANDED},
204     {"ultra-expanded", SP_CSS_FONT_STRETCH_ULTRA_EXPANDED},
205     {"narrower", SP_CSS_FONT_STRETCH_NARROWER},
206     {"wider", SP_CSS_FONT_STRETCH_WIDER},
207     {NULL, -1}
208 };
210 static SPStyleEnum const enum_text_align[] = {
211     {"start", SP_CSS_TEXT_ALIGN_START},
212     {"end", SP_CSS_TEXT_ALIGN_END},
213     {"left", SP_CSS_TEXT_ALIGN_LEFT},
214     {"right", SP_CSS_TEXT_ALIGN_RIGHT},
215     {"center", SP_CSS_TEXT_ALIGN_CENTER},
216     {"justify", SP_CSS_TEXT_ALIGN_JUSTIFY},
217     {NULL, -1}
218 };
220 static SPStyleEnum const enum_text_transform[] = {
221     {"capitalize", SP_CSS_TEXT_TRANSFORM_CAPITALIZE},
222     {"uppercase", SP_CSS_TEXT_TRANSFORM_UPPERCASE},
223     {"lowercase", SP_CSS_TEXT_TRANSFORM_LOWERCASE},
224     {"none", SP_CSS_TEXT_TRANSFORM_NONE},
225     {NULL, -1}
226 };
228 static SPStyleEnum const enum_text_anchor[] = {
229     {"start", SP_CSS_TEXT_ANCHOR_START},
230     {"middle", SP_CSS_TEXT_ANCHOR_MIDDLE},
231     {"end", SP_CSS_TEXT_ANCHOR_END},
232     {NULL, -1}
233 };
235 static SPStyleEnum const enum_direction[] = {
236     {"ltr", SP_CSS_DIRECTION_LTR},
237     {"rtl", SP_CSS_DIRECTION_RTL},
238     {NULL, -1}
239 };
241 static SPStyleEnum const enum_block_progression[] = {
242     {"tb", SP_CSS_BLOCK_PROGRESSION_TB},
243     {"rl", SP_CSS_BLOCK_PROGRESSION_RL},
244     {"lr", SP_CSS_BLOCK_PROGRESSION_LR},
245     {NULL, -1}
246 };
248 static SPStyleEnum const enum_writing_mode[] = {
249     /* Note that using the same enumerator for lr as lr-tb means we write as lr-tb even if the
250      * input file said lr.  We prefer writing lr-tb on the grounds that the spec says the initial
251      * value is lr-tb rather than lr.
252      *
253      * ECMA scripts may be surprised to find tb-rl in DOM if they set the attribute to rl, so
254      * sharing enumerators for different strings may be a bug (once we support ecma script).
255      */
256     {"lr-tb", SP_CSS_WRITING_MODE_LR_TB},
257     {"rl-tb", SP_CSS_WRITING_MODE_RL_TB},
258     {"tb-rl", SP_CSS_WRITING_MODE_TB_RL},
259     {"lr", SP_CSS_WRITING_MODE_LR_TB},
260     {"rl", SP_CSS_WRITING_MODE_RL_TB},
261     {"tb", SP_CSS_WRITING_MODE_TB_RL},
262     {NULL, -1}
263 };
265 static SPStyleEnum const enum_baseline_shift[] = {
266     {"baseline", SP_CSS_BASELINE_SHIFT_BASELINE},
267     {"sub",      SP_CSS_BASELINE_SHIFT_SUB},
268     {"super",    SP_CSS_BASELINE_SHIFT_SUPER},
269     {NULL, -1}
270 };
272 static SPStyleEnum const enum_visibility[] = {
273     {"hidden", SP_CSS_VISIBILITY_HIDDEN},
274     {"collapse", SP_CSS_VISIBILITY_COLLAPSE},
275     {"visible", SP_CSS_VISIBILITY_VISIBLE},
276     {NULL, -1}
277 };
279 static SPStyleEnum const enum_overflow[] = {
280     {"visible", SP_CSS_OVERFLOW_VISIBLE},
281     {"hidden", SP_CSS_OVERFLOW_HIDDEN},
282     {"scroll", SP_CSS_OVERFLOW_SCROLL},
283     {"auto", SP_CSS_OVERFLOW_AUTO},
284     {NULL, -1}
285 };
287 static SPStyleEnum const enum_display[] = {
288     {"none",      SP_CSS_DISPLAY_NONE},
289     {"inline",    SP_CSS_DISPLAY_INLINE},
290     {"block",     SP_CSS_DISPLAY_BLOCK},
291     {"list-item", SP_CSS_DISPLAY_LIST_ITEM},
292     {"run-in",    SP_CSS_DISPLAY_RUN_IN},
293     {"compact",   SP_CSS_DISPLAY_COMPACT},
294     {"marker",    SP_CSS_DISPLAY_MARKER},
295     {"table",     SP_CSS_DISPLAY_TABLE},
296     {"inline-table",  SP_CSS_DISPLAY_INLINE_TABLE},
297     {"table-row-group",    SP_CSS_DISPLAY_TABLE_ROW_GROUP},
298     {"table-header-group", SP_CSS_DISPLAY_TABLE_HEADER_GROUP},
299     {"table-footer-group", SP_CSS_DISPLAY_TABLE_FOOTER_GROUP},
300     {"table-row",     SP_CSS_DISPLAY_TABLE_ROW},
301     {"table-column-group", SP_CSS_DISPLAY_TABLE_COLUMN_GROUP},
302     {"table-column",  SP_CSS_DISPLAY_TABLE_COLUMN},
303     {"table-cell",    SP_CSS_DISPLAY_TABLE_CELL},
304     {"table-caption", SP_CSS_DISPLAY_TABLE_CAPTION},
305     {NULL, -1}
306 };
308 static SPStyleEnum const enum_shape_rendering[] = {
309     {"auto", 0},
310     {"optimizeSpeed", 0},
311     {"crispEdges", 0},
312     {"geometricPrecision", 0},
313     {NULL, -1}
314 };
316 static SPStyleEnum const enum_color_rendering[] = {
317     {"auto", 0},
318     {"optimizeSpeed", 0},
319     {"optimizeQuality", 0},
320     {NULL, -1}
321 };
323 static SPStyleEnum const *const enum_image_rendering = enum_color_rendering;
325 static SPStyleEnum const enum_text_rendering[] = {
326     {"auto", 0},
327     {"optimizeSpeed", 0},
328     {"optimizeLegibility", 0},
329     {"geometricPrecision", 0},
330     {NULL, -1}
331 };
333 static SPStyleEnum const enum_enable_background[] = {
334     {"accumulate", SP_CSS_BACKGROUND_ACCUMULATE},
335     {"new", SP_CSS_BACKGROUND_NEW},
336     {NULL, -1}
337 };
339 /**
340  * Release callback.
341  */
342 static void
343 sp_style_object_release(SPObject *object, SPStyle *style)
345     (void)object; // TODO
346     style->object = NULL;
349 /**
350  * Emit style modified signal on style's object if the filter changed.
351  */
352 static void
353 sp_style_filter_ref_modified(SPObject *obj, guint flags, SPStyle *style)
355     (void)flags; // TODO
356     SPFilter *filter=static_cast<SPFilter *>(obj);
357     if (style->getFilter() == filter)
358     {
359         if (style->object) {
360             style->object->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
361         }
362     }
365 /**
366  * Gets called when the filter is (re)attached to the style
367  */
368 static void
369 sp_style_filter_ref_changed(SPObject *old_ref, SPObject *ref, SPStyle *style)
371     if (old_ref) {
372         style->filter_modified_connection.disconnect();
373     }
374     if ( SP_IS_FILTER(ref))
375     {
376         style->filter_modified_connection =
377            ref->connectModified(sigc::bind(sigc::ptr_fun(&sp_style_filter_ref_modified), style));
378     }
380     sp_style_filter_ref_modified(ref, 0, style);
383 /**
384  * Emit style modified signal on style's object if server is style's fill
385  * or stroke paint server.
386  */
387 static void
388 sp_style_paint_server_ref_modified(SPObject *obj, guint flags, SPStyle *style)
390     (void)flags; // TODO
391     SPPaintServer *server = static_cast<SPPaintServer *>(obj);
393     if ((style->fill.isPaintserver())
394         && style->getFillPaintServer() == server)
395     {
396         if (style->object) {
397             /** \todo
398              * fixme: I do not know, whether it is optimal - we are
399              * forcing reread of everything (Lauris)
400              */
401             /** \todo
402              * fixme: We have to use object_modified flag, because parent
403              * flag is only available downstreams.
404              */
405             style->object->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
406         }
407     } else if ((style->stroke.isPaintserver())
408         && style->getStrokePaintServer() == server)
409     {
410         if (style->object) {
411             /// \todo fixme:
412             style->object->requestModified(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
413         }
414     } else if (server) {
415         g_assert_not_reached();
416     }
419 /**
420  * Gets called when the paintserver is (re)attached to the style
421  */
422 static void
423 sp_style_fill_paint_server_ref_changed(SPObject *old_ref, SPObject *ref, SPStyle *style)
425     if (old_ref) {
426         style->fill_ps_modified_connection.disconnect();
427     }
428     if (SP_IS_PAINT_SERVER(ref)) {
429         style->fill_ps_modified_connection =
430            ref->connectModified(sigc::bind(sigc::ptr_fun(&sp_style_paint_server_ref_modified), style));
431     }
433     sp_style_paint_server_ref_modified(ref, 0, style);
436 /**
437  * Gets called when the paintserver is (re)attached to the style
438  */
439 static void
440 sp_style_stroke_paint_server_ref_changed(SPObject *old_ref, SPObject *ref, SPStyle *style)
442     if (old_ref) {
443         style->stroke_ps_modified_connection.disconnect();
444     }
445     if (SP_IS_PAINT_SERVER(ref)) {
446         style->stroke_ps_modified_connection =
447           ref->connectModified(sigc::bind(sigc::ptr_fun(&sp_style_paint_server_ref_modified), style));
448     }
450     sp_style_paint_server_ref_modified(ref, 0, style);
453 /**
454  * Returns a new SPStyle object with settings as per sp_style_clear().
455  */
456 SPStyle *
457 sp_style_new(SPDocument *document)
459     SPStyle *const style = g_new0(SPStyle, 1);
461     style->refcount = 1;
462     style->object = NULL;
463     style->document = document;
464     style->text = sp_text_style_new();
465     style->text_private = TRUE;
467     sp_style_clear(style);
469     style->cloned = false;
471     new (&style->release_connection) sigc::connection();
472     new (&style->filter_modified_connection) sigc::connection();
473     new (&style->fill_ps_modified_connection) sigc::connection();
474     new (&style->stroke_ps_modified_connection) sigc::connection();
476     return style;
480 /**
481  * Creates a new SPStyle object, and attaches it to the specified SPObject.
482  */
483 SPStyle *
484 sp_style_new_from_object(SPObject *object)
486     g_return_val_if_fail(object != NULL, NULL);
487     g_return_val_if_fail(SP_IS_OBJECT(object), NULL);
489     SPStyle *style = sp_style_new( object->document );
490     style->object = object;
491     style->release_connection = object->connectRelease(sigc::bind<1>(sigc::ptr_fun(&sp_style_object_release), style));
493     if (object && object->cloned) {
494         style->cloned = true;
495     }
497     return style;
501 /**
502  * Increase refcount of style.
503  */
504 SPStyle *
505 sp_style_ref(SPStyle *style)
507     g_return_val_if_fail(style != NULL, NULL);
508     g_return_val_if_fail(style->refcount > 0, NULL);
510     style->refcount += 1;
512     return style;
516 /**
517  * Decrease refcount of style with possible destruction.
518  */
519 SPStyle *
520 sp_style_unref(SPStyle *style)
522     g_return_val_if_fail(style != NULL, NULL);
523     g_return_val_if_fail(style->refcount > 0, NULL);
525     style->refcount -= 1;
527     if (style->refcount < 1) {
528         style->release_connection.disconnect();
529         style->release_connection.~connection();
530         if (style->text) sp_text_style_unref(style->text);
532          if (style->fill.value.href) {
533              style->fill_ps_modified_connection.disconnect();
534              delete style->fill.value.href;
535              style->fill.value.href = NULL;
536          }
537          if (style->stroke.value.href) {
538              style->stroke_ps_modified_connection.disconnect();
539              delete style->stroke.value.href;
540              style->stroke.value.href = NULL;
541          }
542          if (style->filter.href) {
543              style->filter_modified_connection.disconnect();
544              delete style->filter.href;
545              style->filter.href = NULL;
546          }
548         style->filter_modified_connection.~connection();
549         style->fill_ps_modified_connection.~connection();
550         style->stroke_ps_modified_connection.~connection();
552         style->fill.clear();
553         style->stroke.clear();
554         sp_style_filter_clear(style);
556         g_free(style->stroke_dash.dash);
557         g_free(style);
558     }
560     return NULL;
563 /**
564  *  Reads the various style parameters for an object from repr.
565  */
566 static void
567 sp_style_read(SPStyle *style, SPObject *object, Inkscape::XML::Node *repr)
569     g_assert(style != NULL);
570     g_assert(repr != NULL);
571     g_assert(!object || (SP_OBJECT_REPR(object) == repr));
573     sp_style_clear(style);
575     if (object && object->cloned) {
576         style->cloned = true;
577     }
579     /* 1. Style attribute */
580     gchar const *val = repr->attribute("style");
581     if (val != NULL) {
582         sp_style_merge_from_style_string(style, val);
583     }
585     if (object) {
586         sp_style_merge_from_object_stylesheet(style, object);
587     } else {
588         /** \todo No stylesheet information. Find out under what circumstances
589          * this occurs, and handle accordingly.  (If we really wanted to, we
590          * could probably get stylesheets by going through repr->doc.)
591          */
592     }
594     /* 2. Presentation attributes */
595     /* CSS2 */
596     SPS_READ_PENUM_IF_UNSET(&style->visibility, repr, "visibility", enum_visibility, true);
597     SPS_READ_PENUM_IF_UNSET(&style->display, repr, "display", enum_display, true);
598     SPS_READ_PENUM_IF_UNSET(&style->overflow, repr, "overflow", enum_overflow, true);
599     /* Font */
600     SPS_READ_PFONTSIZE_IF_UNSET(&style->font_size, repr, "font-size");
601     SPS_READ_PENUM_IF_UNSET(&style->font_style, repr, "font-style", enum_font_style, true);
602     SPS_READ_PENUM_IF_UNSET(&style->font_variant, repr, "font-variant", enum_font_variant, true);
603     SPS_READ_PENUM_IF_UNSET(&style->font_weight, repr, "font-weight", enum_font_weight, true);
604     SPS_READ_PENUM_IF_UNSET(&style->font_stretch, repr, "font-stretch", enum_font_stretch, true);
605     /* Text (css2 chapter 16) */
606     SPS_READ_PLENGTH_IF_UNSET(&style->text_indent, repr, "text-indent");
607     SPS_READ_PENUM_IF_UNSET(&style->text_align, repr, "text-align", enum_text_align, true);
608     if (!style->text_decoration.set) {
609         val = repr->attribute("text-decoration");
610         if (val) {
611             sp_style_read_itextdecoration(&style->text_decoration, val);
612         }
613     }
614     if (!style->line_height.set) {
615         val = repr->attribute("line-height");
616         if (val) {
617             sp_style_read_ilengthornormal(&style->line_height, val);
618         }
619     }
620     if (!style->letter_spacing.set) {
621         val = repr->attribute("letter-spacing");
622         if (val) {
623             sp_style_read_ilengthornormal(&style->letter_spacing, val);
624         }
625     }
626     if (!style->word_spacing.set) {
627         val = repr->attribute("word-spacing");
628         if (val) {
629             sp_style_read_ilengthornormal(&style->word_spacing, val);
630         }
631     }
632     SPS_READ_PENUM_IF_UNSET(&style->text_transform, repr, "text-transform", enum_text_transform, true);
633     SPS_READ_PENUM_IF_UNSET(&style->direction, repr, "direction", enum_direction, true);
634     SPS_READ_PENUM_IF_UNSET(&style->block_progression, repr, "block_progression", enum_block_progression, true);
636     /* SVG */
637     SPS_READ_PENUM_IF_UNSET(&style->writing_mode, repr, "writing-mode",
638                             enum_writing_mode, true);
639     SPS_READ_PENUM_IF_UNSET(&style->text_anchor, repr, "text-anchor",
640                             enum_text_anchor, true);
641     SPS_READ_PBASELINE_SHIFT_IF_UNSET(&style->baseline_shift, repr, "baseline-shift");
643     /* opacity */
644     if (!style->opacity.set) {
645         val = repr->attribute("opacity");
646         if (val) {
647             sp_style_read_iscale24(&style->opacity, val);
648         }
649     }
650     /* color */
651     if (!style->color.set) {
652         val = repr->attribute("color");
653         if (val) {
654             sp_style_read_icolor(&style->color, val, style, ( object
655                                                               ? SP_OBJECT_DOCUMENT(object)
656                                                               : NULL ));
657         }
658     }
659     /* fill */
660     if (!style->fill.set) {
661         val = repr->attribute("fill");
662         if (val) {
663             style->fill.read( val, *style, (object) ? SP_OBJECT_DOCUMENT(object) : NULL );
664         }
665     }
666     /* fill-opacity */
667     if (!style->fill_opacity.set) {
668         val = repr->attribute("fill-opacity");
669         if (val) {
670             sp_style_read_iscale24(&style->fill_opacity, val);
671         }
672     }
673     /* fill-rule */
674     SPS_READ_PENUM_IF_UNSET(&style->fill_rule, repr, "fill-rule", enum_fill_rule, true);
675     /* stroke */
676     if (!style->stroke.set) {
677         val = repr->attribute("stroke");
678         if (val) {
679             style->stroke.read( val, *style, (object) ? SP_OBJECT_DOCUMENT(object) : NULL );
680         }
681     }
682     SPS_READ_PLENGTH_IF_UNSET(&style->stroke_width, repr, "stroke-width");
683     SPS_READ_PENUM_IF_UNSET(&style->stroke_linecap, repr, "stroke-linecap", enum_stroke_linecap, true);
684     SPS_READ_PENUM_IF_UNSET(&style->stroke_linejoin, repr, "stroke-linejoin", enum_stroke_linejoin, true);
685     SPS_READ_PFLOAT_IF_UNSET(&style->stroke_miterlimit, repr, "stroke-miterlimit");
687     /* markers */
688     if (!style->marker[SP_MARKER_LOC].set) {
689         val = repr->attribute("marker");
690         if (val) {
691             sp_style_read_istring(&style->marker[SP_MARKER_LOC], val);
692         }
693     }
694     if (!style->marker[SP_MARKER_LOC_START].set) {
695         val = repr->attribute("marker-start");
696         if (val) {
697             sp_style_read_istring(&style->marker[SP_MARKER_LOC_START], val);
698         }
699     }
700     if (!style->marker[SP_MARKER_LOC_MID].set) {
701         val = repr->attribute("marker-mid");
702         if (val) {
703             sp_style_read_istring(&style->marker[SP_MARKER_LOC_MID], val);
704         }
705     }
706     if (!style->marker[SP_MARKER_LOC_END].set) {
707         val = repr->attribute("marker-end");
708         if (val) {
709             sp_style_read_istring(&style->marker[SP_MARKER_LOC_END], val);
710         }
711     }
713     /* stroke-opacity */
714     if (!style->stroke_opacity.set) {
715         val = repr->attribute("stroke-opacity");
716         if (val) {
717             sp_style_read_iscale24(&style->stroke_opacity, val);
718         }
719     }
720     if (!style->stroke_dasharray_set) {
721         val = repr->attribute("stroke-dasharray");
722         if (val) {
723             sp_style_read_dash(style, val);
724         }
725     }
727     if (!style->stroke_dashoffset_set) {
728         val = repr->attribute("stroke-dashoffset");
729         if (sp_svg_number_read_d(val, &style->stroke_dash.offset)) {
730             style->stroke_dashoffset_set = TRUE;
731         } else if (val && !strcmp(val, "inherit")) {
732             style->stroke_dashoffset_set = TRUE;
733             style->stroke_dashoffset_inherit = TRUE;
734         } else {
735             style->stroke_dashoffset_set = FALSE;
736         }
737     }
739     /* -inkscape-font-specification */
740     if (!style->text_private || !style->text->font_specification.set) {
741         val = repr->attribute("-inkscape-font-specification");
742         if (val) {
743             if (!style->text_private) sp_style_privatize_text(style);
744             gchar *val_unquoted = attribute_unquote(val);
745             sp_style_read_istring(&style->text->font_specification, val_unquoted);
746             if (val_unquoted) g_free (val_unquoted);
747         }
748     }
750     /* font-family */
751     if (!style->text_private || !style->text->font_family.set) {
752         val = repr->attribute("font-family");
753         if (val) {
754             if (!style->text_private) sp_style_privatize_text(style);
755             gchar *val_unquoted = attribute_unquote(val);
756             sp_style_read_istring(&style->text->font_family, val_unquoted);
757             if (val_unquoted) g_free (val_unquoted);
758         }
759     }
761     /* filter effects */
762     if (!style->filter.set) {
763         val = repr->attribute("filter");
764         if (val) {
765             sp_style_read_ifilter(val, style, (object) ? SP_OBJECT_DOCUMENT(object) : NULL);
766         }
767     }
768     SPS_READ_PENUM_IF_UNSET(&style->enable_background, repr,
769                             "enable-background", enum_enable_background, true);
771     /* 3. Merge from parent */
772     if (object) {
773         if (object->parent) {
774             sp_style_merge_from_parent(style, SP_OBJECT_STYLE(object->parent));
775         }
776     } else {
777         if (sp_repr_parent(repr)) {
778             /// \todo fixme: This is not the prettiest thing (Lauris)
779             SPStyle *parent = sp_style_new(NULL);
780             sp_style_read(parent, NULL, sp_repr_parent(repr));
781             sp_style_merge_from_parent(style, parent);
782             sp_style_unref(parent);
783         }
784     }
788 /**
789  * Read style properties from object's repr.
790  *
791  * 1. Reset existing object style
792  * 2. Load current effective object style
793  * 3. Load i attributes from immediate parent (which has to be up-to-date)
794  */
795 void
796 sp_style_read_from_object(SPStyle *style, SPObject *object)
798     g_return_if_fail(style != NULL);
799     g_return_if_fail(object != NULL);
800     g_return_if_fail(SP_IS_OBJECT(object));
802     Inkscape::XML::Node *repr = SP_OBJECT_REPR(object);
803     g_return_if_fail(repr != NULL);
805     sp_style_read(style, object, repr);
809 /**
810  * Read style properties from preferences.
811  * @param style The style to write to
812  * @param path Preferences directory from which the style should be read
813  */
814 void
815 sp_style_read_from_prefs(SPStyle *style, Glib::ustring const &path)
817     g_return_if_fail(style != NULL);
818     g_return_if_fail(path != "");
820     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
822     // not optimal: we reconstruct the node based on the prefs, then pass it to
823     // sp_style_read for actual processing.
824     Inkscape::XML::SimpleDocument *tempdoc = new Inkscape::XML::SimpleDocument;
825     Inkscape::XML::Node *tempnode = tempdoc->createElement("temp");
827     std::vector<Inkscape::Preferences::Entry> attrs = prefs->getAllEntries(path);
828     for (std::vector<Inkscape::Preferences::Entry>::iterator i = attrs.begin(); i != attrs.end(); ++i) {
829         tempnode->setAttribute(i->getEntryName().data(), i->getString().data());
830     }
832     sp_style_read(style, NULL, tempnode);
834     Inkscape::GC::release(tempnode);
835     Inkscape::GC::release(tempdoc);
836     delete tempdoc;
841 /**
842  *
843  */
844 static void
845 sp_style_privatize_text(SPStyle *style)
847     SPTextStyle *text = style->text;
848     style->text = sp_text_style_duplicate_unset(style->text);
849     sp_text_style_unref(text);
850     style->text_private = TRUE;
854 /**
855  * Merge property into style.
856  *
857  * Should be called in order of highest to lowest precedence.
858  * E.g. for a single style string, call from the last declaration to the first,
859  * as CSS says that later declarations override earlier ones.
860  *
861  * \pre val != NULL.
862  */
863 static void
864 sp_style_merge_property(SPStyle *style, gint id, gchar const *val)
866     g_return_if_fail(val != NULL);
868     switch (id) {
869         case SP_PROP_INKSCAPE_FONT_SPEC:
870             if (!style->text_private) sp_style_privatize_text(style);
871             if (!style->text->font_specification.set) {
872                 gchar *val_unquoted = attribute_unquote(val);
873                 sp_style_read_istring(&style->text->font_specification, val_unquoted);
874                 if (val_unquoted) g_free (val_unquoted);
875             }
876             break;
877         /* CSS2 */
878         /* Font */
879         case SP_PROP_FONT_FAMILY:
880             if (!style->text_private) sp_style_privatize_text(style);
881             if (!style->text->font_family.set) {
882                 gchar *val_unquoted = attribute_unquote(val);
883                 sp_style_read_istring(&style->text->font_family, val_unquoted);
884                 if (val_unquoted) g_free (val_unquoted);
885             }
886             break;
887         case SP_PROP_FONT_SIZE:
888             SPS_READ_IFONTSIZE_IF_UNSET(&style->font_size, val);
889             break;
890         case SP_PROP_FONT_SIZE_ADJUST:
891             if (strcmp(val, "none") != 0) {
892                 g_warning("Unimplemented style property id SP_PROP_FONT_SIZE_ADJUST: value: %s", val);
893             }
894             break;
895         case SP_PROP_FONT_STYLE:
896             SPS_READ_IENUM_IF_UNSET(&style->font_style, val, enum_font_style, true);
897             break;
898         case SP_PROP_FONT_VARIANT:
899             SPS_READ_IENUM_IF_UNSET(&style->font_variant, val, enum_font_variant, true);
900             break;
901         case SP_PROP_FONT_WEIGHT:
902             SPS_READ_IENUM_IF_UNSET(&style->font_weight, val, enum_font_weight, true);
903             break;
904         case SP_PROP_FONT_STRETCH:
905             SPS_READ_IENUM_IF_UNSET(&style->font_stretch, val, enum_font_stretch, true);
906             break;
907         case SP_PROP_FONT:
908             if (!style->text_private) sp_style_privatize_text(style);
909             if (!style->text->font.set) {
910                 g_free(style->text->font.value);
911                 style->text->font.value = g_strdup(val);
912                 style->text->font.set = TRUE;
913                 style->text->font.inherit = (val && !strcmp(val, "inherit"));
914             }
915             break;
916             /* Text */
917         case SP_PROP_TEXT_INDENT:
918             SPS_READ_ILENGTH_IF_UNSET(&style->text_indent, val);
919             break;
920         case SP_PROP_TEXT_ALIGN:
921             SPS_READ_IENUM_IF_UNSET(&style->text_align, val, enum_text_align, true);
922             break;
923         case SP_PROP_TEXT_DECORATION:
924             if (!style->text_decoration.set) {
925                 sp_style_read_itextdecoration(&style->text_decoration, val);
926             }
927             break;
928         case SP_PROP_LINE_HEIGHT:
929             if (!style->line_height.set) {
930                 sp_style_read_ilengthornormal(&style->line_height, val);
931             }
932             break;
933         case SP_PROP_LETTER_SPACING:
934             if (!style->letter_spacing.set) {
935                 sp_style_read_ilengthornormal(&style->letter_spacing, val);
936             }
937             break;
938         case SP_PROP_WORD_SPACING:
939             if (!style->word_spacing.set) {
940                 sp_style_read_ilengthornormal(&style->word_spacing, val);
941             }
942             break;
943         case SP_PROP_TEXT_TRANSFORM:
944             SPS_READ_IENUM_IF_UNSET(&style->text_transform, val, enum_text_transform, true);
945             break;
946             /* Text (css3) */
947         case SP_PROP_DIRECTION:
948             SPS_READ_IENUM_IF_UNSET(&style->direction, val, enum_direction, true);
949             break;
950         case SP_PROP_BLOCK_PROGRESSION:
951             SPS_READ_IENUM_IF_UNSET(&style->block_progression, val, enum_block_progression, true);
952             break;
953         case SP_PROP_WRITING_MODE:
954             SPS_READ_IENUM_IF_UNSET(&style->writing_mode, val, enum_writing_mode, true);
955             break;
956         case SP_PROP_TEXT_ANCHOR:
957             SPS_READ_IENUM_IF_UNSET(&style->text_anchor, val, enum_text_anchor, true);
958             break;
959         case SP_PROP_BASELINE_SHIFT:
960             SPS_READ_IBASELINE_SHIFT_IF_UNSET(&style->baseline_shift, val);
961             break;
962             /* Text (unimplemented) */
963         case SP_PROP_TEXT_RENDERING: {
964             /* Ignore the hint. */
965             SPIEnum dummy;
966             SPS_READ_IENUM_IF_UNSET(&dummy, val, enum_text_rendering, true);
967             break;
968         }
969         case SP_PROP_ALIGNMENT_BASELINE:
970             g_warning("Unimplemented style property SP_PROP_ALIGNMENT_BASELINE: value: %s", val);
971             break;
972         case SP_PROP_DOMINANT_BASELINE:
973             g_warning("Unimplemented style property SP_PROP_DOMINANT_BASELINE: value: %s", val);
974             break;
975         case SP_PROP_GLYPH_ORIENTATION_HORIZONTAL:
976             g_warning("Unimplemented style property SP_PROP_ORIENTATION_HORIZONTAL: value: %s", val);
977             break;
978         case SP_PROP_GLYPH_ORIENTATION_VERTICAL:
979             g_warning("Unimplemented style property SP_PROP_ORIENTATION_VERTICAL: value: %s", val);
980             break;
981         case SP_PROP_KERNING:
982             g_warning("Unimplemented style property SP_PROP_KERNING: value: %s", val);
983             break;
984             /* Misc */
985         case SP_PROP_CLIP:
986             g_warning("Unimplemented style property SP_PROP_CLIP: value: %s", val);
987             break;
988         case SP_PROP_COLOR:
989             if (!style->color.set) {
990                 sp_style_read_icolor(&style->color, val, style, (style->object) ? SP_OBJECT_DOCUMENT(style->object) : NULL);
991             }
992             break;
993         case SP_PROP_CURSOR:
994             g_warning("Unimplemented style property SP_PROP_CURSOR: value: %s", val);
995             break;
996         case SP_PROP_DISPLAY:
997             SPS_READ_IENUM_IF_UNSET(&style->display, val, enum_display, true);
998             break;
999         case SP_PROP_OVERFLOW:
1000             /** \todo
1001              * FIXME: not supported properly yet, we just read and write it,
1002              * but act as if it is always "display".
1003              */
1004             SPS_READ_IENUM_IF_UNSET(&style->overflow, val, enum_overflow, true);
1005             break;
1006         case SP_PROP_VISIBILITY:
1007             SPS_READ_IENUM_IF_UNSET(&style->visibility, val, enum_visibility, true);
1008             break;
1009             /* SVG */
1010             /* Clip/Mask */
1011         case SP_PROP_CLIP_PATH:
1012             /** \todo
1013              * This is a workaround. Inkscape only supports 'clip-path' as SVG attribute, not as
1014              * style property. By having both CSS and SVG attribute set, editing of clip-path
1015              * will fail, since CSS always overwrites SVG attributes.
1016              * Fixes Bug #324849
1017              */
1018             g_warning("attribute 'clip-path' given as CSS");
1020                         //XML Tree being directly used here.
1021             style->object->getRepr()->setAttribute("clip-path", val);
1022             break;
1023         case SP_PROP_CLIP_RULE:
1024             g_warning("Unimplemented style property SP_PROP_CLIP_RULE: value: %s", val);
1025             break;
1026         case SP_PROP_MASK:
1027             /** \todo
1028              * See comment for SP_PROP_CLIP_PATH
1029              */
1030             g_warning("attribute 'mask' given as CSS");
1031                         
1032                         //XML Tree being directly used here.
1033             style->object->getRepr()->setAttribute("mask", val);
1034             break;
1035         case SP_PROP_OPACITY:
1036             if (!style->opacity.set) {
1037                 sp_style_read_iscale24(&style->opacity, val);
1038             }
1039             break;
1040         case SP_PROP_ENABLE_BACKGROUND:
1041             SPS_READ_IENUM_IF_UNSET(&style->enable_background, val,
1042                                     enum_enable_background, true);
1043             break;
1044             /* Filter */
1045         case SP_PROP_FILTER:
1046             if (!style->filter.set && !style->filter.inherit) {
1047                 sp_style_read_ifilter(val, style, (style->object) ? SP_OBJECT_DOCUMENT(style->object) : NULL);
1048             }
1049             break;
1050         case SP_PROP_FLOOD_COLOR:
1051             g_warning("Unimplemented style property SP_PROP_FLOOD_COLOR: value: %s", val);
1052             break;
1053         case SP_PROP_FLOOD_OPACITY:
1054             g_warning("Unimplemented style property SP_PROP_FLOOD_OPACITY: value: %s", val);
1055             break;
1056         case SP_PROP_LIGHTING_COLOR:
1057             g_warning("Unimplemented style property SP_PROP_LIGHTING_COLOR: value: %s", val);
1058             break;
1059             /* Gradient */
1060         case SP_PROP_STOP_COLOR:
1061             g_warning("Unimplemented style property SP_PROP_STOP_COLOR: value: %s", val);
1062             break;
1063         case SP_PROP_STOP_OPACITY:
1064             g_warning("Unimplemented style property SP_PROP_STOP_OPACITY: value: %s", val);
1065             break;
1066             /* Interactivity */
1067         case SP_PROP_POINTER_EVENTS:
1068             g_warning("Unimplemented style property SP_PROP_POINTER_EVENTS: value: %s", val);
1069             break;
1070             /* Paint */
1071         case SP_PROP_COLOR_INTERPOLATION:
1072             g_warning("Unimplemented style property SP_PROP_COLOR_INTERPOLATION: value: %s", val);
1073             break;
1074         case SP_PROP_COLOR_INTERPOLATION_FILTERS:
1075             g_warning("Unimplemented style property SP_PROP_INTERPOLATION_FILTERS: value: %s", val);
1076             break;
1077         case SP_PROP_COLOR_PROFILE:
1078             g_warning("Unimplemented style property SP_PROP_COLOR_PROFILE: value: %s", val);
1079             break;
1080         case SP_PROP_COLOR_RENDERING: {
1081             /* Ignore the hint. */
1082             SPIEnum dummy;
1083             SPS_READ_IENUM_IF_UNSET(&dummy, val, enum_color_rendering, true);
1084             break;
1085         }
1086         case SP_PROP_FILL:
1087             if (!style->fill.set) {
1088                 style->fill.read( val, *style, (style->object) ? SP_OBJECT_DOCUMENT(style->object) : NULL );
1089             }
1090             break;
1091         case SP_PROP_FILL_OPACITY:
1092             if (!style->fill_opacity.set) {
1093                 sp_style_read_iscale24(&style->fill_opacity, val);
1094             }
1095             break;
1096         case SP_PROP_FILL_RULE:
1097             if (!style->fill_rule.set) {
1098                 sp_style_read_ienum(&style->fill_rule, val, enum_fill_rule, true);
1099             }
1100             break;
1101         case SP_PROP_IMAGE_RENDERING: {
1102             /* Ignore the hint. */
1103             SPIEnum dummy;
1104             SPS_READ_IENUM_IF_UNSET(&dummy, val, enum_image_rendering, true);
1105             break;
1106         }
1107         case SP_PROP_MARKER:
1108             /* TODO:  Call sp_uri_reference_resolve(SPDocument *document, guchar const *uri) */
1109             /* style->marker[SP_MARKER_LOC] = g_quark_from_string(val); */
1110             if (!style->marker[SP_MARKER_LOC].set) {
1111                 g_free(style->marker[SP_MARKER_LOC].value);
1112                 style->marker[SP_MARKER_LOC].value = g_strdup(val);
1113                 style->marker[SP_MARKER_LOC].set = TRUE;
1114                 style->marker[SP_MARKER_LOC].inherit = (val && !strcmp(val, "inherit"));
1115             }
1116             break;
1118         case SP_PROP_MARKER_START:
1119             /* TODO:  Call sp_uri_reference_resolve(SPDocument *document, guchar const *uri) */
1120             if (!style->marker[SP_MARKER_LOC_START].set) {
1121                 g_free(style->marker[SP_MARKER_LOC_START].value);
1122                 style->marker[SP_MARKER_LOC_START].value = g_strdup(val);
1123                 style->marker[SP_MARKER_LOC_START].set = TRUE;
1124                 style->marker[SP_MARKER_LOC_START].inherit = (val && !strcmp(val, "inherit"));
1125             }
1126             break;
1127         case SP_PROP_MARKER_MID:
1128             /* TODO:  Call sp_uri_reference_resolve(SPDocument *document, guchar const *uri) */
1129             if (!style->marker[SP_MARKER_LOC_MID].set) {
1130                 g_free(style->marker[SP_MARKER_LOC_MID].value);
1131                 style->marker[SP_MARKER_LOC_MID].value = g_strdup(val);
1132                 style->marker[SP_MARKER_LOC_MID].set = TRUE;
1133                 style->marker[SP_MARKER_LOC_MID].inherit = (val && !strcmp(val, "inherit"));
1134             }
1135             break;
1136         case SP_PROP_MARKER_END:
1137             /* TODO:  Call sp_uri_reference_resolve(SPDocument *document, guchar const *uri) */
1138             if (!style->marker[SP_MARKER_LOC_END].set) {
1139                 g_free(style->marker[SP_MARKER_LOC_END].value);
1140                 style->marker[SP_MARKER_LOC_END].value = g_strdup(val);
1141                 style->marker[SP_MARKER_LOC_END].set = TRUE;
1142                 style->marker[SP_MARKER_LOC_END].inherit = (val && !strcmp(val, "inherit"));
1143             }
1144             break;
1146         case SP_PROP_SHAPE_RENDERING: {
1147             /* Ignore the hint. */
1148             SPIEnum dummy;
1149             SPS_READ_IENUM_IF_UNSET(&dummy, val, enum_shape_rendering, true);
1150             break;
1151         }
1153         case SP_PROP_STROKE:
1154             if (!style->stroke.set) {
1155                 style->stroke.read( val, *style, (style->object) ? SP_OBJECT_DOCUMENT(style->object) : NULL );
1156             }
1157             break;
1158         case SP_PROP_STROKE_WIDTH:
1159             SPS_READ_ILENGTH_IF_UNSET(&style->stroke_width, val);
1160             break;
1161         case SP_PROP_STROKE_DASHARRAY:
1162             if (!style->stroke_dasharray_set) {
1163                 sp_style_read_dash(style, val);
1164             }
1165             break;
1166         case SP_PROP_STROKE_DASHOFFSET:
1167             if (!style->stroke_dashoffset_set) {
1168                 if (sp_svg_number_read_d(val, &style->stroke_dash.offset)) {
1169                     style->stroke_dashoffset_set = TRUE;
1170                 } else if (val && !strcmp(val, "inherit")) {
1171                     style->stroke_dashoffset_set = TRUE;
1172                     style->stroke_dashoffset_inherit = TRUE;
1173                 } else {
1174                     style->stroke_dashoffset_set = FALSE;
1175                 }
1176             }
1177             break;
1178         case SP_PROP_STROKE_LINECAP:
1179             if (!style->stroke_linecap.set) {
1180                 sp_style_read_ienum(&style->stroke_linecap, val, enum_stroke_linecap, true);
1181             }
1182             break;
1183         case SP_PROP_STROKE_LINEJOIN:
1184             if (!style->stroke_linejoin.set) {
1185                 sp_style_read_ienum(&style->stroke_linejoin, val, enum_stroke_linejoin, true);
1186             }
1187             break;
1188         case SP_PROP_STROKE_MITERLIMIT:
1189             if (!style->stroke_miterlimit.set) {
1190                 sp_style_read_ifloat(&style->stroke_miterlimit, val);
1191             }
1192             break;
1193         case SP_PROP_STROKE_OPACITY:
1194             if (!style->stroke_opacity.set) {
1195                 sp_style_read_iscale24(&style->stroke_opacity, val);
1196             }
1197             break;
1199         default:
1200             g_warning("Invalid style property id: %d value: %s", id, val);
1201             break;
1202     }
1205 static void
1206 sp_style_merge_style_from_decl(SPStyle *const style, CRDeclaration const *const decl)
1208     /** \todo Ensure that property is lcased, as per
1209      * http://www.w3.org/TR/REC-CSS2/syndata.html#q4.
1210      * Should probably be done in libcroco.
1211      */
1212     unsigned const prop_idx = sp_attribute_lookup(decl->property->stryng->str);
1213     if (prop_idx != SP_ATTR_INVALID) {
1214         /** \todo
1215          * effic: Test whether the property is already set before trying to
1216          * convert to string. Alternatively, set from CRTerm directly rather
1217          * than converting to string.
1218          */
1219         guchar *const str_value_unsigned = cr_term_to_string(decl->value);
1220         gchar *const str_value = reinterpret_cast<gchar *>(str_value_unsigned);
1221         sp_style_merge_property(style, prop_idx, str_value);
1222         g_free(str_value);
1223     }
1226 static void
1227 sp_style_merge_from_props(SPStyle *const style, CRPropList *const props)
1229 #if 0 /* forwards */
1230     for (CRPropList const *cur = props; cur; cur = cr_prop_list_get_next(cur)) {
1231         CRDeclaration *decl = NULL;
1232         cr_prop_list_get_decl(cur, &decl);
1233         sp_style_merge_style_from_decl(style, decl);
1234     }
1235 #else /* in reverse order, as we need later declarations to take precedence over earlier ones. */
1236     if (props) {
1237         sp_style_merge_from_props(style, cr_prop_list_get_next(props));
1238         CRDeclaration *decl = NULL;
1239         cr_prop_list_get_decl(props, &decl);
1240         sp_style_merge_style_from_decl(style, decl);
1241     }
1242 #endif
1245 /**
1246  * \pre decl_list != NULL
1247  */
1248 static void
1249 sp_style_merge_from_decl_list(SPStyle *const style, CRDeclaration const *const decl_list)
1251     // read the decls from end to start, using head recursion, so that latter declarations override
1252     // (Ref: http://www.w3.org/TR/REC-CSS2/cascade.html#cascading-order point 4.)
1253     // because sp_style_merge_style_from_decl only sets properties that are unset
1254     if (decl_list->next) {
1255         sp_style_merge_from_decl_list(style, decl_list->next);
1256     }
1257     sp_style_merge_style_from_decl(style, decl_list);
1260 static CRSelEng *
1261 sp_repr_sel_eng()
1263     CRSelEng *const ret = cr_sel_eng_new();
1264     cr_sel_eng_set_node_iface(ret, &Inkscape::XML::croco_node_iface);
1266     /** \todo
1267      * Check whether we need to register any pseudo-class handlers.
1268      * libcroco has its own default handlers for first-child and lang.
1269      *
1270      * We probably want handlers for link and arguably visited (though
1271      * inkscape can't visit links at the time of writing).  hover etc.
1272      * more useful in inkview than the editor inkscape.
1273      *
1274      * http://www.w3.org/TR/SVG11/styling.html#StylingWithCSS says that
1275      * the following should be honoured, at least by inkview:
1276      * :hover, :active, :focus, :visited, :link.
1277      */
1279     g_assert(ret);
1280     return ret;
1283 static void
1284 sp_style_merge_from_object_stylesheet(SPStyle *const style, SPObject const *const object)
1286     static CRSelEng *sel_eng = NULL;
1287     if (!sel_eng) {
1288         sel_eng = sp_repr_sel_eng();
1289     }
1291     CRPropList *props = NULL;
1293     //XML Tree being directly used here while it shouldn't be.
1294     CRStatus status = cr_sel_eng_get_matched_properties_from_cascade(sel_eng,
1295                                                                      object->document->style_cascade,
1296                                                                      object->getRepr(),
1297                                                                      &props);
1298     g_return_if_fail(status == CR_OK);
1299     /// \todo Check what errors can occur, and handle them properly.
1300     if (props) {
1301         sp_style_merge_from_props(style, props);
1302         cr_prop_list_destroy(props);
1303     }
1306 /**
1307  * Parses a style="..." string and merges it with an existing SPStyle.
1308  */
1309 void
1310 sp_style_merge_from_style_string(SPStyle *const style, gchar const *const p)
1312     /*
1313      * Reference: http://www.w3.org/TR/SVG11/styling.html#StyleAttribute:
1314      * ``When CSS styling is used, CSS inline style is specified by including
1315      * semicolon-separated property declarations of the form "name : value"
1316      * within the style attribute''.
1317      *
1318      * That's fairly ambiguous.  Is a `value' allowed to contain semicolons?
1319      * Why does it say "including", what else is allowed in the style
1320      * attribute value?
1321      */
1323     CRDeclaration *const decl_list
1324         = cr_declaration_parse_list_from_buf(reinterpret_cast<guchar const *>(p), CR_UTF_8);
1325     if (decl_list) {
1326         sp_style_merge_from_decl_list(style, decl_list);
1327         cr_declaration_destroy(decl_list);
1328     }
1331 /** Indexed by SP_CSS_FONT_SIZE_blah. */
1332 static float const font_size_table[] = {6.0, 8.0, 10.0, 12.0, 14.0, 18.0, 24.0};
1334 static void
1335 sp_style_merge_font_size_from_parent(SPIFontSize &child, SPIFontSize const &parent)
1337     /* 'font-size' */
1338     if (!child.set || child.inherit) {
1339         /* Inherit the computed value.  Reference: http://www.w3.org/TR/SVG11/styling.html#Inheritance */
1340         child.computed = parent.computed;
1341     } else if (child.type == SP_FONT_SIZE_LITERAL) {
1342         /** \todo
1343          * fixme: SVG and CSS do not specify clearly, whether we should use
1344          * user or screen coordinates (Lauris)
1345          */
1346         if (child.value < SP_CSS_FONT_SIZE_SMALLER) {
1347             child.computed = font_size_table[child.value];
1348         } else if (child.value == SP_CSS_FONT_SIZE_SMALLER) {
1349             child.computed = parent.computed / 1.2;
1350         } else if (child.value == SP_CSS_FONT_SIZE_LARGER) {
1351             child.computed = parent.computed * 1.2;
1352         } else {
1353             /* Illegal value */
1354         }
1355     } else if (child.type == SP_FONT_SIZE_PERCENTAGE) {
1356         /* Unlike most other lengths, percentage for font size is relative to parent computed value
1357          * rather than viewport. */
1358         child.computed = parent.computed * SP_F8_16_TO_FLOAT(child.value);
1359     }
1362 // Some shifts are defined relative to parent.
1363 static void
1364 sp_style_merge_baseline_shift_from_parent(SPIBaselineShift &child, SPIBaselineShift const &parent,
1365                                           SPIFontSize const &pfont_size)
1367     /* 'baseline-shift' */
1368     if (!child.set || child.inherit) {
1369         /* Inherit the computed value.  Reference: http://www.w3.org/TR/SVG11/styling.html#Inheritance */
1370         child.computed = parent.computed;  // Does this make sense (applying a shift a second time)?
1371     } else if (child.type == SP_BASELINE_SHIFT_LITERAL) {
1372         if( child.literal == SP_CSS_BASELINE_SHIFT_BASELINE ) {
1373             child.computed = 0; // No change
1374         } else if (child.literal == SP_CSS_BASELINE_SHIFT_SUB ) {
1375             // Should use subscript position from font relative to alphabetic baseline
1376             // OpenOffice, Adobe: -0.33, Word -0.14, LaTex about -0.2.
1377             child.computed = -0.2 * pfont_size.computed; 
1378         } else if (child.literal == SP_CSS_BASELINE_SHIFT_SUPER ) {
1379             // Should use superscript position from font relative to alphabetic baseline
1380             // OpenOffice, Adobe: 0.33, Word 0.35, LaTex about 0.45.
1381             child.computed =  0.4 * pfont_size.computed; 
1382         } else {
1383             /* Illegal value */
1384         }
1385     } else if (child.type == SP_BASELINE_SHIFT_PERCENTAGE) {
1386         // Percentage for baseline shift is relative to computed "line-height"
1387         // which is just font-size (see SVG1.1 'font').
1388         child.computed = pfont_size.computed * child.value;
1389     } else if (child.type == SP_BASELINE_SHIFT_LENGTH) {
1390         switch (child.unit) {
1391             case SP_CSS_UNIT_EM:
1392                 child.computed = child.value * pfont_size.computed; 
1393                 break;
1394             case SP_CSS_UNIT_EX:
1395                 child.computed = child.value * 0.5 * pfont_size.computed; 
1396                 break;
1397             default:
1398                 /* No change */
1399                 break;
1400         }
1401     }
1402     // baseline-shifts are relative to parent baseline
1403     child.computed += parent.computed;
1406 /**
1407  * Sets computed values in \a style, which may involve inheriting from (or in some other way
1408  * calculating from) corresponding computed values of \a parent.
1409  *
1410  * References: http://www.w3.org/TR/SVG11/propidx.html shows what properties inherit by default.
1411  * http://www.w3.org/TR/SVG11/styling.html#Inheritance gives general rules as to what it means to
1412  * inherit a value.  http://www.w3.org/TR/REC-CSS2/cascade.html#computed-value is more precise
1413  * about what the computed value is (not obvious for lengths).
1414  *
1415  * \pre \a parent's computed values are already up-to-date.
1416  */
1417 void
1418 sp_style_merge_from_parent(SPStyle *const style, SPStyle const *const parent)
1420     g_return_if_fail(style != NULL);
1422     /** \todo
1423      * fixme: Check for existing callers that might pass null parent.
1424      * This should probably be g_return_if_fail, or else we should make a
1425      * best attempt to set computed values correctly without having a parent
1426      * (i.e., by assuming parent has initial values).
1427      */
1428     if (!parent)
1429         return;
1431     /* CSS2 */
1432     /* Font */
1433     sp_style_merge_font_size_from_parent(style->font_size, parent->font_size);
1435     /* 'font-style' */
1436     if (!style->font_style.set || style->font_style.inherit) {
1437         style->font_style.computed = parent->font_style.computed;
1438     }
1440     /* 'font-variant' */
1441     if (!style->font_variant.set || style->font_variant.inherit) {
1442         style->font_variant.computed = parent->font_variant.computed;
1443     }
1445     /* 'font-weight' */
1446     if (!style->font_weight.set || style->font_weight.inherit) {
1447         style->font_weight.computed = parent->font_weight.computed;
1448     } else if (style->font_weight.value == SP_CSS_FONT_WEIGHT_NORMAL) {
1449         /** \todo
1450          * fixme: This is unconditional, i.e., happens even if parent not
1451          * present.
1452          */
1453         style->font_weight.computed = SP_CSS_FONT_WEIGHT_400;
1454     } else if (style->font_weight.value == SP_CSS_FONT_WEIGHT_BOLD) {
1455         style->font_weight.computed = SP_CSS_FONT_WEIGHT_700;
1456     } else if (style->font_weight.value == SP_CSS_FONT_WEIGHT_LIGHTER) {
1457         unsigned const parent_val = parent->font_weight.computed;
1458         g_assert(SP_CSS_FONT_WEIGHT_100 == 0);
1459         // strictly, 'bolder' and 'lighter' should go to the next weight
1460         // expressible in the current font family, but that's difficult to
1461         // find out, so jumping by 3 seems an appropriate approximation
1462         style->font_weight.computed = (parent_val <= SP_CSS_FONT_WEIGHT_100 + 3
1463                                        ? (unsigned)SP_CSS_FONT_WEIGHT_100
1464                                        : parent_val - 3);
1465         g_assert(style->font_weight.computed <= (unsigned) SP_CSS_FONT_WEIGHT_900);
1466     } else if (style->font_weight.value == SP_CSS_FONT_WEIGHT_BOLDER) {
1467         unsigned const parent_val = parent->font_weight.computed;
1468         g_assert(parent_val <= SP_CSS_FONT_WEIGHT_900);
1469         style->font_weight.computed = (parent_val >= SP_CSS_FONT_WEIGHT_900 - 3
1470                                        ? (unsigned)SP_CSS_FONT_WEIGHT_900
1471                                        : parent_val + 3);
1472         g_assert(style->font_weight.computed <= (unsigned) SP_CSS_FONT_WEIGHT_900);
1473     }
1475     /* 'font-stretch' */
1476     if (!style->font_stretch.set || style->font_stretch.inherit) {
1477         style->font_stretch.computed = parent->font_stretch.computed;
1478     } else if (style->font_stretch.value == SP_CSS_FONT_STRETCH_NARROWER) {
1479         unsigned const parent_val = parent->font_stretch.computed;
1480         style->font_stretch.computed = (parent_val == SP_CSS_FONT_STRETCH_ULTRA_CONDENSED
1481                                         ? parent_val
1482                                         : parent_val - 1);
1483         g_assert(style->font_stretch.computed <= (unsigned) SP_CSS_FONT_STRETCH_ULTRA_EXPANDED);
1484     } else if (style->font_stretch.value == SP_CSS_FONT_STRETCH_WIDER) {
1485         unsigned const parent_val = parent->font_stretch.computed;
1486         g_assert(parent_val <= SP_CSS_FONT_STRETCH_ULTRA_EXPANDED);
1487         style->font_stretch.computed = (parent_val == SP_CSS_FONT_STRETCH_ULTRA_EXPANDED
1488                                         ? parent_val
1489                                         : parent_val + 1);
1490         g_assert(style->font_stretch.computed <= (unsigned) SP_CSS_FONT_STRETCH_ULTRA_EXPANDED);
1491     }
1493     /* text (css2) */
1494     if (!style->text_indent.set || style->text_indent.inherit) {
1495         style->text_indent.computed = parent->text_indent.computed;
1496     }
1498     if (!style->text_align.set || style->text_align.inherit) {
1499         style->text_align.computed = parent->text_align.computed;
1500     }
1502     if (!style->text_decoration.set || style->text_decoration.inherit) {
1503         style->text_decoration.underline = parent->text_decoration.underline;
1504         style->text_decoration.overline = parent->text_decoration.overline;
1505         style->text_decoration.line_through = parent->text_decoration.line_through;
1506         style->text_decoration.blink = parent->text_decoration.blink;
1507     }
1509     if (!style->line_height.set || style->line_height.inherit) {
1510         style->line_height.value = parent->line_height.value;
1511         style->line_height.computed = parent->line_height.computed;
1512         style->line_height.normal = parent->line_height.normal;
1513     }
1515     if (!style->letter_spacing.set || style->letter_spacing.inherit) {
1516         style->letter_spacing.value = parent->letter_spacing.value;
1517         style->letter_spacing.computed = parent->letter_spacing.computed;
1518         style->letter_spacing.normal = parent->letter_spacing.normal;
1519     }
1521     if (!style->word_spacing.set || style->word_spacing.inherit) {
1522         style->word_spacing.value = parent->word_spacing.value;
1523         style->word_spacing.computed = parent->word_spacing.computed;
1524         style->word_spacing.normal = parent->word_spacing.normal;
1525     }
1527     if (!style->text_transform.set || style->text_transform.inherit) {
1528         style->text_transform.computed = parent->text_transform.computed;
1529     }
1531     if (!style->direction.set || style->direction.inherit) {
1532         style->direction.computed = parent->direction.computed;
1533     }
1535     if (!style->block_progression.set || style->block_progression.inherit) {
1536         style->block_progression.computed = parent->block_progression.computed;
1537     }
1539     if (!style->writing_mode.set || style->writing_mode.inherit) {
1540         style->writing_mode.computed = parent->writing_mode.computed;
1541     }
1543     if (!style->text_anchor.set || style->text_anchor.inherit) {
1544         style->text_anchor.computed = parent->text_anchor.computed;
1545     }
1547     /* Baseline Shift... Some shifts are relative to parent. */
1548     sp_style_merge_baseline_shift_from_parent(style->baseline_shift, parent->baseline_shift,
1549                                               parent->font_size);
1551     if (style->opacity.inherit) {
1552         style->opacity.value = parent->opacity.value;
1553     }
1555     /* Color */
1556     if (!style->color.set || style->color.inherit) {
1557         sp_style_merge_ipaint(style, &style->color, &parent->color);
1558     }
1560     /* Fill */
1561     if (!style->fill.set || style->fill.inherit || style->fill.currentcolor) {
1562         sp_style_merge_ipaint(style, &style->fill, &parent->fill);
1563     }
1565     if (!style->fill_opacity.set || style->fill_opacity.inherit) {
1566         style->fill_opacity.value = parent->fill_opacity.value;
1567     }
1569     if (!style->fill_rule.set || style->fill_rule.inherit) {
1570         style->fill_rule.computed = parent->fill_rule.computed;
1571     }
1573     /* Stroke */
1574     if (!style->stroke.set || style->stroke.inherit || style->stroke.currentcolor) {
1575         sp_style_merge_ipaint(style, &style->stroke, &parent->stroke);
1576     }
1578     if (!style->stroke_width.set || style->stroke_width.inherit) {
1579         style->stroke_width.computed = parent->stroke_width.computed;
1580     } else {
1581         /* Update computed value for any change in font inherited from parent. */
1582         double const em = style->font_size.computed;
1583         if (style->stroke_width.unit == SP_CSS_UNIT_EM) {
1584             style->stroke_width.computed = style->stroke_width.value * em;
1585         } else if (style->stroke_width.unit == SP_CSS_UNIT_EX) {
1586             double const ex = em * 0.5;  // fixme: Get x height from libnrtype or pango.
1587             style->stroke_width.computed = style->stroke_width.value * ex;
1588         }
1589     }
1591     if (!style->stroke_linecap.set || style->stroke_linecap.inherit) {
1592         style->stroke_linecap.computed = parent->stroke_linecap.computed;
1593     }
1595     if (!style->stroke_linejoin.set || style->stroke_linejoin.inherit) {
1596         style->stroke_linejoin.computed = parent->stroke_linejoin.computed;
1597     }
1599     if (!style->stroke_miterlimit.set || style->stroke_miterlimit.inherit) {
1600         style->stroke_miterlimit.value = parent->stroke_miterlimit.value;
1601     }
1603     if (!style->stroke_dasharray_set || style->stroke_dasharray_inherit) {
1604         style->stroke_dash.n_dash = parent->stroke_dash.n_dash;
1605         if (style->stroke_dash.n_dash > 0) {
1606             style->stroke_dash.dash = g_new(gdouble, style->stroke_dash.n_dash);
1607             memcpy(style->stroke_dash.dash, parent->stroke_dash.dash, style->stroke_dash.n_dash * sizeof(gdouble));
1608         }
1609     }
1611     if (!style->stroke_dashoffset_set || style->stroke_dashoffset_inherit) {
1612         style->stroke_dash.offset = parent->stroke_dash.offset;
1613     }
1615     if (!style->stroke_opacity.set || style->stroke_opacity.inherit) {
1616         style->stroke_opacity.value = parent->stroke_opacity.value;
1617     }
1619     if (style->text && parent->text) {
1620         if (!style->text->font_family.set || style->text->font_family.inherit) {
1621             g_free(style->text->font_family.value);
1622             style->text->font_family.value = g_strdup(parent->text->font_family.value);
1623         }
1624     }
1626     if (style->text && parent->text) {
1627         if (!style->text->font_specification.set || style->text->font_specification.inherit) {
1628             g_free(style->text->font_specification.value);
1629             style->text->font_specification.value = g_strdup(parent->text->font_specification.value);
1630         }
1631     }
1633     /* Markers - Free the old value and make copy of the new */
1634     for (unsigned i = SP_MARKER_LOC; i < SP_MARKER_LOC_QTY; i++) {
1635         if (!style->marker[i].set || style->marker[i].inherit) {
1636             g_free(style->marker[i].value);
1637             style->marker[i].value = g_strdup(parent->marker[i].value);
1638         }
1639     }
1641     /* Filter effects */
1642     if (style->filter.inherit) {
1643         sp_style_merge_ifilter(style, &parent->filter);
1644     }
1646     if(style->enable_background.inherit) {
1647         style->enable_background.value = parent->enable_background.value;
1648     }
1651 template <typename T>
1652 static void
1653 sp_style_merge_prop_from_dying_parent(T &child, T const &parent)
1655     if ( ( !(child.set) || child.inherit )
1656          && parent.set && !(parent.inherit) )
1657     {
1658         child = parent;
1659     }
1662 /**
1663  * Copy SPIString from parent to child.
1664  */
1665 static void
1666 sp_style_merge_string_prop_from_dying_parent(SPIString &child, SPIString const &parent)
1668     if ( ( !(child.set) || child.inherit )
1669          && parent.set && !(parent.inherit) )
1670     {
1671         g_free(child.value);
1672         child.value = g_strdup(parent.value);
1673         child.set = parent.set;
1674         child.inherit = parent.inherit;
1675     }
1678 static void
1679 sp_style_merge_paint_prop_from_dying_parent(SPStyle *style,
1680                                             SPIPaint &child, SPIPaint const &parent)
1682     /** \todo
1683      * I haven't given this much attention.  See comments below about
1684      * currentColor, colorProfile, and relative URIs.
1685      */
1686     if (!child.set || child.inherit) {
1687         sp_style_merge_ipaint(style, &child, &parent);
1688         child.set = parent.set;
1689         child.inherit = parent.inherit;
1690     }
1693 static void
1694 sp_style_merge_rel_enum_prop_from_dying_parent(SPIEnum &child, SPIEnum const &parent,
1695                                                unsigned const max_computed_val,
1696                                                unsigned const smaller_val)
1698     /* We assume that min computed val is 0, contiguous up to max_computed_val,
1699        then zero or more other absolute values, then smaller_val then larger_val. */
1700     unsigned const min_computed_val = 0;
1701     unsigned const larger_val = smaller_val + 1;
1702     g_return_if_fail(min_computed_val < max_computed_val);
1703     g_return_if_fail(max_computed_val < smaller_val);
1705     if (parent.set && !parent.inherit) {
1706         if (!child.set || child.inherit) {
1707             child.value = parent.value;
1708             child.set = parent.set;  // i.e. true
1709             child.inherit = parent.inherit;  // i.e. false
1710         } else if (child.value < smaller_val) {
1711             /* Child has absolute value: leave as is. */
1712         } else if ( ( child.value == smaller_val
1713                       && parent.value == larger_val )
1714                     || ( parent.value == smaller_val
1715                          && child.value == larger_val ) )
1716         {
1717             child.set = false;
1718             /*
1719              * Note that this can result in a change in computed value in the
1720              * rare case that the parent's setting was a no-op (i.e. if the
1721              * parent's parent's computed value was already ultra-condensed or
1722              * ultra-expanded).  However, I'd guess that the change is for the
1723              * better: I'd guess that if the properties were specified
1724              * relatively, then the intent is to counteract parent's effect.
1725              * I.e. I believe this is the best code even in that case.
1726              */
1727         } else if (child.value == parent.value) {
1728             /* Leave as is. */
1729             /** \todo
1730              * It's unclear what to do if style and parent specify the same
1731              * relative directive (narrower or wider).  We can either convert
1732              * to absolute specification or coalesce to a single relative
1733              * request (of half the strength of the original pair).
1734              *
1735              * Converting to a single level of relative specification is a
1736              * better choice if the newly-unlinked clone is itself cloned to
1737              * other contexts (inheriting different font stretchiness): it
1738              * would preserve the effect that it will be narrower than
1739              * the inherited context in each case.  The disadvantage is that
1740              * it will ~certainly affect the computed value of the
1741              * newly-unlinked clone.
1742              */
1743         } else {
1744             unsigned const parent_val = parent.computed;
1745             child.value = ( child.value == smaller_val
1746                             ? ( parent_val == min_computed_val
1747                                 ? parent_val
1748                                 : parent_val - 1 )
1749                             : ( parent_val == max_computed_val
1750                                 ? parent_val
1751                                 : parent_val + 1 ) );
1752             g_assert(child.value <= max_computed_val);
1753             child.inherit = false;
1754             g_assert(child.set);
1755         }
1756     }
1759 template <typename LengthT>
1760 static void
1761 sp_style_merge_length_prop_from_dying_parent(LengthT &child, LengthT const &parent,
1762                                              double const parent_child_em_ratio)
1764     if ( ( !(child.set) || child.inherit )
1765          && parent.set && !(parent.inherit) )
1766     {
1767         child = parent;
1768         switch (parent.unit) {
1769             case SP_CSS_UNIT_EM:
1770             case SP_CSS_UNIT_EX:
1771                 child.value *= parent_child_em_ratio;
1772                 /** \todo
1773                  * fixme: Have separate ex ratio parameter.
1774                  * Get x height from libnrtype or pango.
1775                  */
1776                 if (!IS_FINITE(child.value)) {
1777                     child.value = child.computed;
1778                     child.unit = SP_CSS_UNIT_NONE;
1779                 }
1780                 break;
1782             default:
1783                 break;
1784         }
1785     }
1788 static double
1789 get_relative_font_size_frac(SPIFontSize const &font_size)
1791     switch (font_size.type) {
1792         case SP_FONT_SIZE_LITERAL: {
1793             switch (font_size.value) {
1794                 case SP_CSS_FONT_SIZE_SMALLER:
1795                     return 5.0 / 6.0;
1797                 case SP_CSS_FONT_SIZE_LARGER:
1798                     return 6.0 / 5.0;
1800                 default:
1801                     g_assert_not_reached();
1802             }
1803         }
1805         case SP_FONT_SIZE_PERCENTAGE:
1806             return SP_F8_16_TO_FLOAT(font_size.value);
1808         case SP_FONT_SIZE_LENGTH:
1809             g_assert_not_reached();
1810     }
1811     g_assert_not_reached();
1814 /**
1815  * Combine \a style and \a parent style specifications into a single style specification that
1816  * preserves (as much as possible) the effect of the existing \a style being a child of \a parent.
1817  *
1818  * Called when the parent repr is to be removed (e.g. the parent is a \<use\> element that is being
1819  * unlinked), in which case we copy/adapt property values that are explicitly set in \a parent,
1820  * trying to retain the same visual appearance once the parent is removed.  Interesting cases are
1821  * when there is unusual interaction with the parent's value (opacity, display) or when the value
1822  * can be specified as relative to the parent computed value (font-size, font-weight etc.).
1823  *
1824  * Doesn't update computed values of \a style.  For correctness, you should subsequently call
1825  * sp_style_merge_from_parent against the new parent (presumably \a parent's parent) even if \a
1826  * style was previously up-to-date wrt \a parent.
1827  *
1828  * \pre \a parent's computed values are already up-to-date.
1829  *   (\a style's computed values needn't be up-to-date.)
1830  */
1831 void
1832 sp_style_merge_from_dying_parent(SPStyle *const style, SPStyle const *const parent)
1834     /** \note
1835      * The general rule for each property is as follows:
1836      *
1837      *   If style is set to an absolute value, then leave it as is.
1838      *
1839      *   Otherwise (i.e. if style has a relative value):
1840      *
1841      *     If parent is set to an absolute value, then set style to the computed value.
1842      *
1843      *     Otherwise, calculate the combined relative value (e.g. multiplying the two percentages).
1844      */
1846     /* We do font-size first, to ensure that em size is up-to-date. */
1847     /** \todo
1848      * fixme: We'll need to have more font-related things up the top once
1849      * we're getting x-height from pango or libnrtype.
1850      */
1852     /* Some things that allow relative specifications. */
1853     {
1854         /* font-size.  Note that we update the computed font-size of style,
1855            to assist in em calculations later in this function. */
1856         if (parent->font_size.set && !parent->font_size.inherit) {
1857             if (!style->font_size.set || style->font_size.inherit) {
1858                 /* font_size inherits the computed value, so we can use the parent value
1859                  * verbatim. */
1860                 style->font_size = parent->font_size;
1861             } else if ( style->font_size.type == SP_FONT_SIZE_LENGTH ) {
1862                 /* Child already has absolute size (stored in computed value), so do nothing. */
1863             } else if ( style->font_size.type == SP_FONT_SIZE_LITERAL
1864                         && style->font_size.value < SP_CSS_FONT_SIZE_SMALLER ) {
1865                 /* Child already has absolute size, but we ensure that the computed value
1866                    is up-to-date. */
1867                 unsigned const ix = style->font_size.value;
1868                 g_assert(ix < G_N_ELEMENTS(font_size_table));
1869                 style->font_size.computed = font_size_table[ix];
1870             } else {
1871                 /* Child has relative size. */
1872                 double const child_frac(get_relative_font_size_frac(style->font_size));
1873                 style->font_size.set = true;
1874                 style->font_size.inherit = false;
1875                 style->font_size.computed = parent->font_size.computed * child_frac;
1877                 if ( ( parent->font_size.type == SP_FONT_SIZE_LITERAL
1878                        && parent->font_size.value < SP_CSS_FONT_SIZE_SMALLER )
1879                      || parent->font_size.type == SP_FONT_SIZE_LENGTH )
1880                 {
1881                     /* Absolute value. */
1882                     style->font_size.type = SP_FONT_SIZE_LENGTH;
1883                     /* .value is unused for SP_FONT_SIZE_LENGTH. */
1884                 } else {
1885                     /* Relative value. */
1886                     double const parent_frac(get_relative_font_size_frac(parent->font_size));
1887                     style->font_size.type = SP_FONT_SIZE_PERCENTAGE;
1888                     style->font_size.value = SP_F8_16_FROM_FLOAT(parent_frac * child_frac);
1889                 }
1890             }
1891         }
1893         /* 'font-stretch' */
1894         sp_style_merge_rel_enum_prop_from_dying_parent(style->font_stretch,
1895                                                        parent->font_stretch,
1896                                                        SP_CSS_FONT_STRETCH_ULTRA_EXPANDED,
1897                                                        SP_CSS_FONT_STRETCH_NARROWER);
1899         /* font-weight */
1900         sp_style_merge_rel_enum_prop_from_dying_parent(style->font_weight,
1901                                                        parent->font_weight,
1902                                                        SP_CSS_FONT_WEIGHT_900,
1903                                                        SP_CSS_FONT_WEIGHT_LIGHTER);
1904     }
1907     /* Enum values that don't have any relative settings (other than `inherit'). */
1908     {
1909         SPIEnum SPStyle::*const fields[] = {
1910             //nyi: SPStyle::clip_rule,
1911             //nyi: SPStyle::color_interpolation,
1912             //nyi: SPStyle::color_interpolation_filters,
1913             //nyi: SPStyle::color_rendering,
1914             &SPStyle::direction,
1915             &SPStyle::fill_rule,
1916             &SPStyle::font_style,
1917             &SPStyle::font_variant,
1918             //nyi: SPStyle::image_rendering,
1919             //nyi: SPStyle::pointer_events,
1920             //nyi: SPStyle::shape_rendering,
1921             &SPStyle::stroke_linecap,
1922             &SPStyle::stroke_linejoin,
1923             &SPStyle::text_anchor,
1924             //nyi: &SPStyle::text_rendering,
1925             &SPStyle::visibility,
1926             &SPStyle::writing_mode
1927         };
1929         for (unsigned i = 0; i < G_N_ELEMENTS(fields); ++i) {
1930             SPIEnum SPStyle::*const fld = fields[i];
1931             sp_style_merge_prop_from_dying_parent<SPIEnum>(style->*fld, parent->*fld);
1932         }
1933     }
1935     /* A few other simple inheritance properties. */
1936     {
1937         sp_style_merge_prop_from_dying_parent<SPIScale24>(style->fill_opacity, parent->fill_opacity);
1938         sp_style_merge_prop_from_dying_parent<SPIScale24>(style->stroke_opacity, parent->stroke_opacity);
1939         sp_style_merge_prop_from_dying_parent<SPIFloat>(style->stroke_miterlimit, parent->stroke_miterlimit);
1941         /** \todo
1942          * We currently treat text-decoration as if it were a simple inherited
1943          * property (fixme). This code may need changing once we do the
1944          * special fill/stroke inheritance mentioned by the spec.
1945          */
1946         sp_style_merge_prop_from_dying_parent<SPITextDecoration>(style->text_decoration,
1947                                                                  parent->text_decoration);
1949         //nyi: font-size-adjust,  // <number> | none | inherit
1950         //nyi: glyph-orientation-horizontal,
1951         //nyi: glyph-orientation-vertical,
1952     }
1954     /* Properties that involve length but are easy in other respects. */
1955     {
1956         /* The difficulty with lengths is that font-relative units need adjusting if the font
1957          * varies between parent & child.
1958          *
1959          * Lengths specified in the existing child can stay as they are: its computed font
1960          * specification should stay unchanged, so em & ex lengths should continue to mean the same
1961          * size.
1962          *
1963          * Lengths specified in the dying parent in em or ex need to be scaled according to the
1964          * ratio of em or ex size between parent & child.
1965          */
1966         double const parent_child_em_ratio = parent->font_size.computed / style->font_size.computed;
1968         SPILength SPStyle::*const lfields[] = {
1969             &SPStyle::stroke_width,
1970             &SPStyle::text_indent
1971         };
1972         for (unsigned i = 0; i < G_N_ELEMENTS(lfields); ++i) {
1973             SPILength SPStyle::*fld = lfields[i];
1974             sp_style_merge_length_prop_from_dying_parent<SPILength>(style->*fld,
1975                                                                     parent->*fld,
1976                                                                     parent_child_em_ratio);
1977         }
1979         SPILengthOrNormal SPStyle::*const nfields[] = {
1980             &SPStyle::letter_spacing,
1981             &SPStyle::line_height,
1982             &SPStyle::word_spacing
1983         };
1984         for (unsigned i = 0; i < G_N_ELEMENTS(nfields); ++i) {
1985             SPILengthOrNormal SPStyle::*fld = nfields[i];
1986             sp_style_merge_length_prop_from_dying_parent<SPILengthOrNormal>(style->*fld,
1987                                                                             parent->*fld,
1988                                                                             parent_child_em_ratio);
1989         }
1991         //nyi: &SPStyle::kerning: length or `auto'
1993         /* fixme: Move stroke-dash and stroke-dash-offset here once they
1994            can accept units. */
1995     }
1997     /* Properties that involve a URI but are easy in other respects. */
1998     {
1999         /** \todo
2000          * Could cause problems if original object was in another document
2001          * and it used a relative URL.  (At the time of writing, we don't
2002          * allow hrefs to other documents, so this isn't a problem yet.)
2003          * Paint properties also allow URIs.
2004          */
2005         //nyi: cursor,   // may involve change in effect, but we can't do much better
2006         //nyi: color-profile,
2008         // Markers (marker-start, marker-mid, marker-end).
2009         for (unsigned i = SP_MARKER_LOC; i < SP_MARKER_LOC_QTY; i++) {
2010             sp_style_merge_string_prop_from_dying_parent(style->marker[i], parent->marker[i]);
2011         }
2012     }
2014     /* CSS2 */
2015     /* Font */
2017     if (style->text && parent->text) {
2018         sp_style_merge_string_prop_from_dying_parent(style->text->font_specification,
2019                                                      parent->text->font_specification);
2021         sp_style_merge_string_prop_from_dying_parent(style->text->font_family,
2022                                                      parent->text->font_family);
2023     }
2026     /* Properties that don't inherit by default.  Most of these need special handling. */
2027     {
2028         /*
2029          * opacity's effect is cumulative; we set the new value to the combined effect.  The
2030          * default value for opacity is 1.0, not inherit.  (Note that stroke-opacity and
2031          * fill-opacity are quite different from opacity, and don't need any special handling.)
2032          *
2033          * Cases:
2034          * - parent & child were each previously unset, in which case the effective
2035          *   opacity value is 1.0, and style should remain unset.
2036          * - parent was previously unset (so computed opacity value of 1.0)
2037          *   and child was set to inherit.  The merged child should
2038          *   get a value of 1.0, and shouldn't inherit (lest the new parent
2039          *   has a different opacity value).  Given that opacity's default
2040          *   value is 1.0 (rather than inherit), we might as well have the
2041          *   merged child's opacity be unset.
2042          * - parent was previously unset (so opacity 1.0), and child was set to a number.
2043          *   The merged child should retain its existing settings (though it doesn't matter
2044          *   if we make it unset if that number was 1.0).
2045          * - parent was inherit and child was unset.  Merged child should be set to inherit.
2046          * - parent was inherit and child was inherit.  (We can't in general reproduce this
2047          *   effect (short of introducing a new group), but setting opacity to inherit is rare.)
2048          *   If the inherited value was strictly between 0.0 and 1.0 (exclusive) then the merged
2049          *   child's value should be set to the product of the two, i.e. the square of the
2050          *   inherited value, and should not be marked as inherit.  (This decision assumes that it
2051          *   is more important to retain the effective opacity than to retain the inheriting
2052          *   effect, and assumes that the inheriting effect either isn't important enough to create
2053          *   a group or isn't common enough to bother maintaining the code to create a group.)  If
2054          *   the inherited value was 0.0 or 1.0, then marking the merged child as inherit comes
2055          *   closer to maintaining the effect.
2056          * - parent was inherit and child was set to a numerical value.  If the child's value
2057          *   was 1.0, then the merged child should have the same settings as the parent.
2058          *   If the child's value was 0, then the merged child should also be set to 0.
2059          *   If the child's value was anything else, then we do the same as for the inherit/inherit
2060          *   case above: have the merged child set to the product of the two opacities and not
2061          *   marked as inherit, for the same reasons as for that case.
2062          * - parent was set to a value, and child was unset.  The merged child should have
2063          *   parent's settings.
2064          * - parent was set to a value, and child was inherit.  The merged child should
2065          *   be set to the product, i.e. the square of the parent's value.
2066          * - parent & child are each set to a value.  The merged child should be set to the
2067          *   product.
2068          */
2069         if ( !style->opacity.set
2070              || ( !style->opacity.inherit
2071                   && style->opacity.value == SP_SCALE24_MAX ) )
2072         {
2073             style->opacity = parent->opacity;
2074         } else {
2075             /* Ensure that style's computed value is up-to-date. */
2076             if (style->opacity.inherit) {
2077                 style->opacity.value = parent->opacity.value;
2078             }
2080             /* Multiplication of opacities occurs even if a child's opacity is set to inherit. */
2081             style->opacity.value = SP_SCALE24_MUL(style->opacity.value,
2082                                                   parent->opacity.value);
2084             style->opacity.inherit = (parent->opacity.inherit
2085                                       && style->opacity.inherit
2086                                       && (parent->opacity.value == 0 ||
2087                                           parent->opacity.value == SP_SCALE24_MAX));
2088             style->opacity.set = ( style->opacity.inherit
2089                                    || style->opacity.value < SP_SCALE24_MAX );
2090         }
2092         /* display is in principle similar to opacity, but implementation is easier. */
2093         if ( parent->display.set && !parent->display.inherit
2094              && parent->display.value == SP_CSS_DISPLAY_NONE ) {
2095             style->display.value = SP_CSS_DISPLAY_NONE;
2096             style->display.set = true;
2097             style->display.inherit = false;
2098         } else if (style->display.inherit) {
2099             style->display.value = parent->display.value;
2100             style->display.set = parent->display.set;
2101             style->display.inherit = parent->display.inherit;
2102         } else {
2103             /* Leave as is.  (display doesn't inherit by default.) */
2104         }
2106         /* enable-background - this is rather complicated, because
2107          * it is valid only when applied to container elements.
2108          * Let's check a simple case anyhow. */
2109         if (parent->enable_background.set
2110             && !parent->enable_background.inherit
2111             && style->enable_background.inherit)
2112         {
2113             style->enable_background.set = true;
2114             style->enable_background.inherit = false;
2115             style->enable_background.value = parent->enable_background.value;
2116         }
2118         if (!style->filter.set || style->filter.inherit)
2119         {
2120             sp_style_merge_ifilter(style, &parent->filter);
2121         }
2123         /** \todo
2124          * fixme: Check that we correctly handle all properties that don't
2125          * inherit by default (as shown in
2126          * http://www.w3.org/TR/SVG11/propidx.html for most SVG 1.1 properties).
2127          */
2128     }
2130     /* SPIPaint properties (including color). */
2131     {
2132         /** \todo
2133          * Think about the issues involved if specified as currentColor or
2134          * if specified relative to colorProfile, and if the currentColor or
2135          * colorProfile differs between parent \& child.  See also comments
2136          * elsewhere in this function about URIs.
2137          */
2138         SPIPaint SPStyle::*const fields[] = {
2139             &SPStyle::color,
2140             &SPStyle::fill,
2141             &SPStyle::stroke
2142         };
2143         for (unsigned i = 0; i < G_N_ELEMENTS(fields); ++i) {
2144             SPIPaint SPStyle::*const fld = fields[i];
2145             sp_style_merge_paint_prop_from_dying_parent(style, style->*fld, parent->*fld);
2146         }
2147     }
2149     /* Things from SVG 1.2 or CSS3. */
2150     {
2151         /* Note: If we ever support setting string values for text-align then we'd need strdup
2152          * handling here. */
2153         sp_style_merge_prop_from_dying_parent<SPIEnum>(style->text_align, parent->text_align);
2155         sp_style_merge_prop_from_dying_parent<SPIEnum>(style->text_transform, parent->text_transform);
2156         sp_style_merge_prop_from_dying_parent<SPIEnum>(style->block_progression, parent->block_progression);
2157     }
2159     /* Note: this will need length handling once dasharray supports units. */
2160     if ( ( !style->stroke_dasharray_set || style->stroke_dasharray_inherit )
2161          && parent->stroke_dasharray_set && !parent->stroke_dasharray_inherit )
2162     {
2163         style->stroke_dash.n_dash = parent->stroke_dash.n_dash;
2164         if (style->stroke_dash.n_dash > 0) {
2165             style->stroke_dash.dash = g_new(gdouble, style->stroke_dash.n_dash);
2166             memcpy(style->stroke_dash.dash, parent->stroke_dash.dash, style->stroke_dash.n_dash * sizeof(gdouble));
2167         }
2168         style->stroke_dasharray_set = parent->stroke_dasharray_set;
2169         style->stroke_dasharray_inherit = parent->stroke_dasharray_inherit;
2170     }
2172     /* Note: this will need length handling once dasharray_offset supports units. */
2173     if ((!style->stroke_dashoffset_set || style->stroke_dashoffset_inherit) && parent->stroke_dashoffset_set && !parent->stroke_dashoffset_inherit) {
2174         style->stroke_dash.offset = parent->stroke_dash.offset;
2175         style->stroke_dashoffset_set = parent->stroke_dashoffset_set;
2176         style->stroke_dashoffset_inherit = parent->stroke_dashoffset_inherit;
2177         /* TODO: Try to
2178          * represent it as a normal SPILength; though will need to do something about existing
2179          * users of stroke_dash.offset and stroke_dashoffset_set. */
2180     }
2184 static void
2185 sp_style_set_ipaint_to_uri(SPStyle *style, SPIPaint *paint, const Inkscape::URI *uri, SPDocument *document)
2187     // it may be that this style's SPIPaint has not yet created its URIReference;
2188     // now that we have a document, we can create it here
2189     if (!paint->value.href && document) {
2190         paint->value.href = new SPPaintServerReference(document);
2191         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));
2192     }
2194     if (paint->value.href && paint->value.href->getObject())
2195         paint->value.href->detach();
2197     if (paint->value.href) {
2198         try {
2199             paint->value.href->attach(*uri);
2200         } catch (Inkscape::BadURIException &e) {
2201             g_warning("%s", e.what());
2202             paint->value.href->detach();
2203         }
2204     }
2207 static void
2208 sp_style_set_ipaint_to_uri_string (SPStyle *style, SPIPaint *paint, const gchar *uri)
2210     try {
2211         const Inkscape::URI IURI(uri);
2212         sp_style_set_ipaint_to_uri(style, paint, &IURI, style->document);
2213     } catch (...) {
2214         g_warning("URI failed to parse: %s", uri);
2215     }
2218 void
2219 sp_style_set_to_uri_string (SPStyle *style, bool isfill, const gchar *uri)
2221     sp_style_set_ipaint_to_uri_string (style, isfill? &style->fill : &style->stroke, uri);
2224 /**
2225  *
2226  */
2227 static void
2228 sp_style_merge_ipaint(SPStyle *style, SPIPaint *paint, SPIPaint const *parent)
2230     if ((paint->set && paint->currentcolor) || parent->currentcolor) {
2231         bool isset = paint->set;
2232         paint->clear();
2233         paint->set = isset;
2234         paint->currentcolor = TRUE;
2235         paint->setColor(style->color.value.color);
2236         return;
2237     }
2239     paint->clear();
2240     if ( parent->isPaintserver() ) {
2241         if (parent->value.href) {
2242             sp_style_set_ipaint_to_uri(style, paint, parent->value.href->getURI(), parent->value.href->getOwnerDocument());
2243         } else {
2244             g_warning("Expected paint server not found.");
2245         }
2246     } else if ( parent->isColor() ) {
2247         paint->setColor( parent->value.color );
2248     } else if ( parent->isNoneSet() ) {
2249         paint->noneSet = TRUE;
2250     } else if ( parent->isNone() ) {
2251         //
2252     } else {
2253         g_assert_not_reached();
2254     }
2258 /**
2259  * Merge filter style from parent.
2260  * Filter effects do not inherit by default
2261  */
2262 static void
2263 sp_style_merge_ifilter(SPStyle *style, SPIFilter const *parent)
2265     // FIXME:
2266     // instead of just copying over, we need to _really merge_ the two filters by combining their
2267     // filter primitives
2269     sp_style_filter_clear(style);
2270     style->filter.set = parent->set;
2271     style->filter.inherit = parent->inherit;
2273     if (style->filter.href && style->filter.href->getObject())
2274        style->filter.href->detach();
2276     // it may be that this style has not yet created its SPFilterReference
2277     if (!style->filter.href && style->object && SP_OBJECT_DOCUMENT(style->object)) {
2278             style->filter.href = new SPFilterReference(SP_OBJECT_DOCUMENT(style->object));
2279             style->filter.href->changedSignal().connect(sigc::bind(sigc::ptr_fun(sp_style_filter_ref_changed), style));
2280     }
2282     if (style->filter.href && parent->href && parent->href->getObject()) {
2283         try {
2284             style->filter.href->attach(*parent->href->getURI());
2285         } catch (Inkscape::BadURIException &e) {
2286             g_warning("%s", e.what());
2287             style->filter.href->detach();
2288         }
2289     }
2292 /**
2293  * Dumps the style to a CSS string, with either SP_STYLE_FLAG_IFSET or
2294  * SP_STYLE_FLAG_ALWAYS flags. Used with Always for copying an object's
2295  * complete cascaded style to style_clipboard. When you need a CSS string
2296  * for an object in the document tree, you normally call
2297  * sp_style_write_difference instead to take into account the object's parent.
2298  *
2299  * \pre style != NULL.
2300  * \pre flags in {IFSET, ALWAYS}.
2301  * \post ret != NULL.
2302  */
2303 gchar *
2304 sp_style_write_string(SPStyle const *const style, guint const flags)
2306     /** \todo
2307      * Merge with write_difference, much duplicate code!
2308      */
2309     g_return_val_if_fail(style != NULL, NULL);
2310     g_return_val_if_fail(((flags == SP_STYLE_FLAG_IFSET) ||
2311                           (flags == SP_STYLE_FLAG_ALWAYS)  ),
2312                          NULL);
2314     gchar c[BMAX];
2315     gchar *p = c;
2316     *p = '\0';
2318     p += sp_style_write_ifontsize(p, c + BMAX - p, "font-size", &style->font_size, NULL, flags);
2319     p += sp_style_write_ienum(p, c + BMAX - p, "font-style", enum_font_style, &style->font_style, NULL, flags);
2320     p += sp_style_write_ienum(p, c + BMAX - p, "font-variant", enum_font_variant, &style->font_variant, NULL, flags);
2321     p += sp_style_write_ienum(p, c + BMAX - p, "font-weight", enum_font_weight, &style->font_weight, NULL, flags);
2322     p += sp_style_write_ienum(p, c + BMAX - p, "font-stretch", enum_font_stretch, &style->font_stretch, NULL, flags);
2324     /* Text */
2325     p += sp_style_write_ilength(p, c + BMAX - p, "text-indent", &style->text_indent, NULL, flags);
2326     p += sp_style_write_ienum(p, c + BMAX - p, "text-align", enum_text_align, &style->text_align, NULL, flags);
2327     p += sp_style_write_itextdecoration(p, c + BMAX - p, "text-decoration", &style->text_decoration, NULL, flags);
2328     p += sp_style_write_ilengthornormal(p, c + BMAX - p, "line-height", &style->line_height, NULL, flags);
2329     p += sp_style_write_ilengthornormal(p, c + BMAX - p, "letter-spacing", &style->letter_spacing, NULL, flags);
2330     p += sp_style_write_ilengthornormal(p, c + BMAX - p, "word-spacing", &style->word_spacing, NULL, flags);
2331     p += sp_style_write_ienum(p, c + BMAX - p, "text-transform", enum_text_transform, &style->text_transform, NULL, flags);
2332     p += sp_style_write_ienum(p, c + BMAX - p, "direction", enum_direction, &style->direction, NULL, flags);
2333     p += sp_style_write_ienum(p, c + BMAX - p, "block-progression", enum_block_progression, &style->block_progression, NULL, flags);
2334     p += sp_style_write_ienum(p, c + BMAX - p, "writing-mode", enum_writing_mode, &style->writing_mode, NULL, flags);
2336     p += sp_style_write_ienum(p, c + BMAX - p, "text-anchor", enum_text_anchor, &style->text_anchor, NULL, flags);
2337     p += sp_style_write_ibaselineshift(p, c + BMAX - p, "baseline-shift", &style->baseline_shift, NULL, flags);
2340     /// \todo fixme: Per type methods need default flag too (lauris)
2342     if (style->opacity.value != SP_SCALE24_MAX) {
2343         p += sp_style_write_iscale24(p, c + BMAX - p, "opacity", &style->opacity, NULL, flags);
2344     }
2346     if (!style->color.noneSet) { // CSS does not permit "none" for color
2347         p += sp_style_write_ipaint(p, c + BMAX - p, "color", &style->color, NULL, flags);
2348     }
2350     p += sp_style_write_ipaint(p, c + BMAX - p, "fill", &style->fill, NULL, flags);
2351     // if fill:none, skip writing fill properties
2352     if (!style->fill.noneSet) {
2353         p += sp_style_write_iscale24(p, c + BMAX - p, "fill-opacity", &style->fill_opacity, NULL, flags);
2354         p += sp_style_write_ienum(p, c + BMAX - p, "fill-rule", enum_fill_rule, &style->fill_rule, NULL, flags);
2355     }
2357     p += sp_style_write_ipaint(p, c + BMAX - p, "stroke", &style->stroke, NULL, flags);
2359     // stroke width affects markers, so write it if there's stroke OR any markers
2360     if (!style->stroke.noneSet ||
2361         style->marker[SP_MARKER_LOC].set ||
2362         style->marker[SP_MARKER_LOC_START].set ||
2363         style->marker[SP_MARKER_LOC_MID].set ||
2364         style->marker[SP_MARKER_LOC_END].set) {
2365         p += sp_style_write_ilength(p, c + BMAX - p, "stroke-width", &style->stroke_width, NULL, flags);
2366     }
2368     // if stroke:none, skip writing stroke properties
2369     if (!style->stroke.noneSet) {
2370         p += sp_style_write_ienum(p, c + BMAX - p, "stroke-linecap", enum_stroke_linecap, &style->stroke_linecap, NULL, flags);
2371         p += sp_style_write_ienum(p, c + BMAX - p, "stroke-linejoin", enum_stroke_linejoin, &style->stroke_linejoin, NULL, flags);
2372         p += sp_style_write_ifloat(p, c + BMAX - p, "stroke-miterlimit", &style->stroke_miterlimit, NULL, flags);
2373         p += sp_style_write_iscale24(p, c + BMAX - p, "stroke-opacity", &style->stroke_opacity, NULL, flags);
2375         /** \todo fixme: */
2376         if ((flags == SP_STYLE_FLAG_ALWAYS)
2377             || style->stroke_dasharray_set)
2378         {
2379             if (style->stroke_dasharray_inherit) {
2380                 p += g_snprintf(p, c + BMAX - p, "stroke-dasharray:inherit;");
2381             } else if (style->stroke_dash.n_dash && style->stroke_dash.dash) {
2382                 p += g_snprintf(p, c + BMAX - p, "stroke-dasharray:");
2383                 gint i;
2384                 for (i = 0; i < style->stroke_dash.n_dash; i++) {
2385                     Inkscape::CSSOStringStream os;
2386                     if (i) {
2387                         os << ", ";
2388                     }
2389                     os << style->stroke_dash.dash[i];
2390                     p += g_strlcpy(p, os.str().c_str(), c + BMAX - p);
2391                 }
2392                 if (p < c + BMAX) {
2393                     *p++ = ';';
2394                 }
2395             } else {
2396                 p += g_snprintf(p, c + BMAX - p, "stroke-dasharray:none;");
2397             }
2398         }
2400         /** \todo fixme: */
2401         if (style->stroke_dashoffset_set) {
2402             if (style->stroke_dashoffset_inherit) {
2403                 p += g_snprintf(p, c + BMAX - p, "stroke-dashoffset:inherit;");
2404             } else {
2405                 Inkscape::CSSOStringStream os;
2406                 os << "stroke-dashoffset:" << style->stroke_dash.offset << ";";
2407                 p += g_strlcpy(p, os.str().c_str(), c + BMAX - p);
2408             }
2409         } else if (flags == SP_STYLE_FLAG_ALWAYS) {
2410             p += g_snprintf(p, c + BMAX - p, "stroke-dashoffset:0;");
2411         }
2412     }
2414     bool marker_none = false;
2415     gchar *master = style->marker[SP_MARKER_LOC].value;
2416     if (style->marker[SP_MARKER_LOC].set) {
2417         p += g_snprintf(p, c + BMAX - p, "marker:%s;", style->marker[SP_MARKER_LOC].value);
2418     } else if (flags == SP_STYLE_FLAG_ALWAYS) {
2419         p += g_snprintf(p, c + BMAX - p, "marker:none;");
2420         marker_none = true;
2421     }
2422     if (style->marker[SP_MARKER_LOC_START].set
2423        && (!master || strcmp(master, style->marker[SP_MARKER_LOC_START].value))) {
2424         p += g_snprintf(p, c + BMAX - p, "marker-start:%s;", style->marker[SP_MARKER_LOC_START].value);
2425     } else if (flags == SP_STYLE_FLAG_ALWAYS && !marker_none) {
2426         p += g_snprintf(p, c + BMAX - p, "marker-start:none;");
2427     }
2428     if (style->marker[SP_MARKER_LOC_MID].set
2429        && (!master || strcmp(master, style->marker[SP_MARKER_LOC_MID].value))) {
2430         p += g_snprintf(p, c + BMAX - p, "marker-mid:%s;", style->marker[SP_MARKER_LOC_MID].value);
2431     } else if (flags == SP_STYLE_FLAG_ALWAYS && !marker_none) {
2432         p += g_snprintf(p, c + BMAX - p, "marker-mid:none;");
2433     }
2434     if (style->marker[SP_MARKER_LOC_END].set
2435        && (!master || strcmp(master, style->marker[SP_MARKER_LOC_END].value))) {
2436         p += g_snprintf(p, c + BMAX - p, "marker-end:%s;", style->marker[SP_MARKER_LOC_END].value);
2437     } else if (flags == SP_STYLE_FLAG_ALWAYS && !marker_none) {
2438         p += g_snprintf(p, c + BMAX - p, "marker-end:none;");
2439     }
2441     p += sp_style_write_ienum(p, c + BMAX - p, "visibility", enum_visibility, &style->visibility, NULL, flags);
2442     p += sp_style_write_ienum(p, c + BMAX - p, "display", enum_display, &style->display, NULL, flags);
2443     p += sp_style_write_ienum(p, c + BMAX - p, "overflow", enum_overflow, &style->overflow, NULL, flags);
2445     /* filter: */
2446     p += sp_style_write_ifilter(p, c + BMAX - p, "filter", &style->filter, NULL, flags);
2448     p += sp_style_write_ienum(p, c + BMAX - p, "enable-background", enum_enable_background, &style->enable_background, NULL, flags);
2450     /* fixme: */
2451     p += sp_text_style_write(p, c + BMAX - p, style->text, flags);
2453     /* Get rid of trailing `;'. */
2454     if (p != c) {
2455         --p;
2456         if (*p == ';') {
2457             *p = '\0';
2458         }
2459     }
2461     return g_strdup(c);
2465 #define STYLE_BUF_MAX
2468 /**
2469  * Dumps style to CSS string, see sp_style_write_string()
2470  *
2471  * \pre from != NULL.
2472  * \pre to != NULL.
2473  * \post ret != NULL.
2474  */
2475 gchar *
2476 sp_style_write_difference(SPStyle const *const from, SPStyle const *const to)
2478     g_return_val_if_fail(from != NULL, NULL);
2479     g_return_val_if_fail(to != NULL, NULL);
2481     gchar c[BMAX], *p = c;
2482     *p = '\0';
2484     p += sp_style_write_ifontsize(p, c + BMAX - p, "font-size", &from->font_size, &to->font_size, SP_STYLE_FLAG_IFDIFF);
2485     p += sp_style_write_ienum(p, c + BMAX - p, "font-style", enum_font_style, &from->font_style, &to->font_style, SP_STYLE_FLAG_IFDIFF);
2486     p += sp_style_write_ienum(p, c + BMAX - p, "font-variant", enum_font_variant, &from->font_variant, &to->font_variant, SP_STYLE_FLAG_IFDIFF);
2487     p += sp_style_write_ienum(p, c + BMAX - p, "font-weight", enum_font_weight, &from->font_weight, &to->font_weight, SP_STYLE_FLAG_IFDIFF);
2488     p += sp_style_write_ienum(p, c + BMAX - p, "font-stretch", enum_font_stretch, &from->font_stretch, &to->font_stretch, SP_STYLE_FLAG_IFDIFF);
2490     /* Text */
2491     p += sp_style_write_ilength(p, c + BMAX - p, "text-indent", &from->text_indent, &to->text_indent, SP_STYLE_FLAG_IFDIFF);
2492     p += sp_style_write_ienum(p, c + BMAX - p, "text-align", enum_text_align, &from->text_align, &to->text_align, SP_STYLE_FLAG_IFDIFF);
2493     p += sp_style_write_itextdecoration(p, c + BMAX - p, "text-decoration", &from->text_decoration, &to->text_decoration, SP_STYLE_FLAG_IFDIFF);
2494     p += sp_style_write_ilengthornormal(p, c + BMAX - p, "line-height", &from->line_height, &to->line_height, SP_STYLE_FLAG_IFDIFF);
2495     p += sp_style_write_ilengthornormal(p, c + BMAX - p, "letter-spacing", &from->letter_spacing, &to->letter_spacing, SP_STYLE_FLAG_IFDIFF);
2496     p += sp_style_write_ilengthornormal(p, c + BMAX - p, "word-spacing", &from->word_spacing, &to->word_spacing, SP_STYLE_FLAG_IFDIFF);
2497     p += sp_style_write_ienum(p, c + BMAX - p, "text-transform", enum_text_transform, &from->text_transform, &to->text_transform, SP_STYLE_FLAG_IFDIFF);
2498     p += sp_style_write_ienum(p, c + BMAX - p, "direction", enum_direction, &from->direction, &to->direction, SP_STYLE_FLAG_IFDIFF);
2499     p += sp_style_write_ienum(p, c + BMAX - p, "block-progression", enum_block_progression, &from->block_progression, &to->block_progression, SP_STYLE_FLAG_IFDIFF);
2500     p += sp_style_write_ienum(p, c + BMAX - p, "writing-mode", enum_writing_mode, &from->writing_mode, &to->writing_mode, SP_STYLE_FLAG_IFDIFF);
2502     p += sp_style_write_ienum(p, c + BMAX - p, "text-anchor", enum_text_anchor, &from->text_anchor, &to->text_anchor, SP_STYLE_FLAG_IFDIFF);
2503     p += sp_style_write_ibaselineshift(p, c + BMAX - p, "baseline-shift", &from->baseline_shift, &to->baseline_shift, SP_STYLE_FLAG_IFDIFF);
2505     /// \todo fixme: Per type methods need default flag too
2506     if (from->opacity.set && from->opacity.value != SP_SCALE24_MAX) {
2507         p += sp_style_write_iscale24(p, c + BMAX - p, "opacity", &from->opacity, &to->opacity, SP_STYLE_FLAG_IFSET);
2508     }
2510     if (!from->color.noneSet) { // CSS does not permit "none" for color
2511         p += sp_style_write_ipaint(p, c + BMAX - p, "color", &from->color, &to->color, SP_STYLE_FLAG_IFSET);
2512     }
2514     p += sp_style_write_ipaint(p, c + BMAX - p, "fill", &from->fill, &to->fill, SP_STYLE_FLAG_IFDIFF);
2515     // if fill:none, skip writing fill properties
2516     if (!from->fill.noneSet) {
2517         p += sp_style_write_iscale24(p, c + BMAX - p, "fill-opacity", &from->fill_opacity, &to->fill_opacity, SP_STYLE_FLAG_IFDIFF);
2518         p += sp_style_write_ienum(p, c + BMAX - p, "fill-rule", enum_fill_rule, &from->fill_rule, &to->fill_rule, SP_STYLE_FLAG_IFDIFF);
2519     }
2521     p += sp_style_write_ipaint(p, c + BMAX - p, "stroke", &from->stroke, &to->stroke, SP_STYLE_FLAG_IFDIFF);
2523     // stroke width affects markers, so write it if there's stroke OR any markers
2524     if (!from->stroke.noneSet ||
2525         from->marker[SP_MARKER_LOC].set ||
2526         from->marker[SP_MARKER_LOC_START].set ||
2527         from->marker[SP_MARKER_LOC_MID].set ||
2528         from->marker[SP_MARKER_LOC_END].set) {
2529         p += sp_style_write_ilength(p, c + BMAX - p, "stroke-width", &from->stroke_width, &to->stroke_width, SP_STYLE_FLAG_IFDIFF);
2530     }
2532     // if stroke:none, skip writing stroke properties
2533     if (!from->stroke.noneSet) {
2534         p += sp_style_write_ienum(p, c + BMAX - p, "stroke-linecap", enum_stroke_linecap,
2535                                   &from->stroke_linecap, &to->stroke_linecap, SP_STYLE_FLAG_IFDIFF);
2536         p += sp_style_write_ienum(p, c + BMAX - p, "stroke-linejoin", enum_stroke_linejoin,
2537                                   &from->stroke_linejoin, &to->stroke_linejoin, SP_STYLE_FLAG_IFDIFF);
2538         p += sp_style_write_ifloat(p, c + BMAX - p, "stroke-miterlimit",
2539                                    &from->stroke_miterlimit, &to->stroke_miterlimit, SP_STYLE_FLAG_IFDIFF);
2540         /** \todo fixme: */
2541         if (from->stroke_dasharray_set) {
2542             if (from->stroke_dasharray_inherit) {
2543                 p += g_snprintf(p, c + BMAX - p, "stroke-dasharray:inherit;");
2544             } else if (from->stroke_dash.n_dash && from->stroke_dash.dash) {
2545                 p += g_snprintf(p, c + BMAX - p, "stroke-dasharray:");
2546                 for (gint i = 0; i < from->stroke_dash.n_dash; i++) {
2547                     Inkscape::CSSOStringStream os;
2548                     if (i) {
2549                         os << ", ";
2550                     }
2551                     os << from->stroke_dash.dash[i];
2552                     p += g_strlcpy(p, os.str().c_str(), c + BMAX - p);
2553                 }
2554                 p += g_snprintf(p, c + BMAX - p, ";");
2555             }
2556         }
2557         /* fixme: */
2558         if (from->stroke_dashoffset_set) {
2559             if (from->stroke_dashoffset_inherit) {
2560                 p += g_snprintf(p, c + BMAX - p, "stroke-dashoffset:inherit;");
2561             } else {
2562                 Inkscape::CSSOStringStream os;
2563                 os << "stroke-dashoffset:" << from->stroke_dash.offset << ";";
2564                 p += g_strlcpy(p, os.str().c_str(), c + BMAX - p);
2565             }
2566         }
2567         p += sp_style_write_iscale24(p, c + BMAX - p, "stroke-opacity", &from->stroke_opacity, &to->stroke_opacity, SP_STYLE_FLAG_IFDIFF);
2568     }
2570     /* markers */
2571     gchar *master = from->marker[SP_MARKER_LOC].value;
2572     if (master != NULL) {
2573         p += g_snprintf(p, c + BMAX - p, "marker:%s;", master);
2574     }
2575     if (from->marker[SP_MARKER_LOC_START].value != NULL && (!master || strcmp(master, from->marker[SP_MARKER_LOC_START].value))) {
2576         p += g_snprintf(p, c + BMAX - p, "marker-start:%s;", from->marker[SP_MARKER_LOC_START].value);
2577     }
2578     if (from->marker[SP_MARKER_LOC_MID].value != NULL && (!master || strcmp(master, from->marker[SP_MARKER_LOC_MID].value))) {
2579         p += g_snprintf(p, c + BMAX - p, "marker-mid:%s;",   from->marker[SP_MARKER_LOC_MID].value);
2580     }
2581     if (from->marker[SP_MARKER_LOC_END].value != NULL && (!master || strcmp(master, from->marker[SP_MARKER_LOC_END].value))) {
2582         p += g_snprintf(p, c + BMAX - p, "marker-end:%s;",   from->marker[SP_MARKER_LOC_END].value);
2583     }
2585     p += sp_style_write_ienum(p, c + BMAX - p, "visibility", enum_visibility, &from->visibility, &to->visibility, SP_STYLE_FLAG_IFSET);
2586     p += sp_style_write_ienum(p, c + BMAX - p, "display", enum_display, &from->display, &to->display, SP_STYLE_FLAG_IFSET);
2587     p += sp_style_write_ienum(p, c + BMAX - p, "overflow", enum_overflow, &from->overflow, &to->overflow, SP_STYLE_FLAG_IFSET);
2589     /* filter: */
2590     p += sp_style_write_ifilter(p, c + BMAX - p, "filter", &from->filter, &to->filter, SP_STYLE_FLAG_IFDIFF);
2592     p += sp_style_write_ienum(p, c + BMAX - p, "enable-background", enum_enable_background, &from->enable_background, &to->enable_background, SP_STYLE_FLAG_IFSET);
2594     p += sp_text_style_write(p, c + BMAX - p, from->text, SP_STYLE_FLAG_IFDIFF);
2596     /** \todo
2597      * The reason we use IFSET rather than IFDIFF is the belief that the IFDIFF
2598      * flag is mainly only for attributes that don't handle explicit unset well.
2599      * We may need to revisit the behaviour of this routine.
2600      */
2602     /* Get rid of trailing `;'. */
2603     if (p != c) {
2604         --p;
2605         if (*p == ';') {
2606             *p = '\0';
2607         }
2608     }
2610     return g_strdup(c);
2615 /**
2616  * Reset all style properties.
2617  */
2618 static void
2619 sp_style_clear(SPStyle *style)
2621     g_return_if_fail(style != NULL);
2623     style->fill.clear();
2624     style->stroke.clear();
2625     sp_style_filter_clear(style);
2627     if (style->fill.value.href) {
2628         delete style->fill.value.href;
2629         style->fill.value.href = NULL;
2630     }
2631     if (style->stroke.value.href) {
2632         delete style->stroke.value.href;
2633         style->stroke.value.href = NULL;
2634     }
2635     if (style->filter.href) {
2636         delete style->filter.href;
2637         style->filter.href = NULL;
2638     }
2640     if (style->stroke_dash.dash) {
2641         g_free(style->stroke_dash.dash);
2642     }
2644     style->stroke_dasharray_inherit = FALSE;
2645     style->stroke_dashoffset_inherit = FALSE;
2647     /** \todo fixme: Do that text manipulation via parents */
2648     SPObject *object = style->object;
2649     SPDocument *document = style->document;
2650     gint const refcount = style->refcount;
2651     SPTextStyle *text = style->text;
2652     unsigned const text_private = style->text_private;
2654     memset(style, 0, sizeof(SPStyle));
2656     style->refcount = refcount;
2657     style->object = object;
2658     style->document = document;
2660     if (document) {
2661         style->filter.href = new SPFilterReference(document);
2662         style->filter.href->changedSignal().connect(sigc::bind(sigc::ptr_fun(sp_style_filter_ref_changed), style));
2664         style->fill.value.href = new SPPaintServerReference(document);
2665         style->fill.value.href->changedSignal().connect(sigc::bind(sigc::ptr_fun(sp_style_fill_paint_server_ref_changed), style));
2667         style->stroke.value.href = new SPPaintServerReference(document);
2668         style->stroke.value.href->changedSignal().connect(sigc::bind(sigc::ptr_fun(sp_style_stroke_paint_server_ref_changed), style));
2669     }
2671     style->text = text;
2672     style->text_private = text_private;
2674     style->text->font_specification.set = FALSE;
2675     style->text->font.set = FALSE;
2676     style->text->font_family.set = FALSE;
2678     style->font_size.set = FALSE;
2679     style->font_size.type = SP_FONT_SIZE_LITERAL;
2680     style->font_size.value = SP_CSS_FONT_SIZE_MEDIUM;
2681     style->font_size.computed = 12.0;
2682     style->font_style.set = FALSE;
2683     style->font_style.value = style->font_style.computed = SP_CSS_FONT_STYLE_NORMAL;
2684     style->font_variant.set = FALSE;
2685     style->font_variant.value = style->font_variant.computed = SP_CSS_FONT_VARIANT_NORMAL;
2686     style->font_weight.set = FALSE;
2687     style->font_weight.value = SP_CSS_FONT_WEIGHT_NORMAL;
2688     style->font_weight.computed = SP_CSS_FONT_WEIGHT_400;
2689     style->font_stretch.set = FALSE;
2690     style->font_stretch.value = style->font_stretch.computed = SP_CSS_FONT_STRETCH_NORMAL;
2692     /* text */
2693     style->text_indent.set = FALSE;
2694     style->text_indent.unit = SP_CSS_UNIT_NONE;
2695     style->text_indent.computed = 0.0;
2697     style->text_align.set = FALSE;
2698     style->text_align.value = style->text_align.computed = SP_CSS_TEXT_ALIGN_START;
2700     style->text_decoration.set = FALSE;
2701     style->text_decoration.underline = FALSE;
2702     style->text_decoration.overline = FALSE;
2703     style->text_decoration.line_through = FALSE;
2704     style->text_decoration.blink = FALSE;
2706     style->line_height.set = FALSE;
2707     style->line_height.unit = SP_CSS_UNIT_PERCENT;
2708     style->line_height.normal = TRUE;
2709     style->line_height.value = style->line_height.computed = 1.0;
2711     style->letter_spacing.set = FALSE;
2712     style->letter_spacing.unit = SP_CSS_UNIT_NONE;
2713     style->letter_spacing.normal = TRUE;
2714     style->letter_spacing.value = style->letter_spacing.computed = 0.0;
2716     style->word_spacing.set = FALSE;
2717     style->word_spacing.unit = SP_CSS_UNIT_NONE;
2718     style->word_spacing.normal = TRUE;
2719     style->word_spacing.value = style->word_spacing.computed = 0.0;
2721     style->baseline_shift.set = FALSE;
2722     style->baseline_shift.type = SP_BASELINE_SHIFT_LITERAL;
2723     style->baseline_shift.unit = SP_CSS_UNIT_NONE;
2724     style->baseline_shift.literal = SP_CSS_BASELINE_SHIFT_BASELINE; 
2725     style->baseline_shift.value = 0.0;
2726     style->baseline_shift.computed = 0.0;
2728     style->text_transform.set = FALSE;
2729     style->text_transform.value = style->text_transform.computed = SP_CSS_TEXT_TRANSFORM_NONE;
2731     style->direction.set = FALSE;
2732     style->direction.value = style->direction.computed = SP_CSS_DIRECTION_LTR;
2734     style->block_progression.set = FALSE;
2735     style->block_progression.value = style->block_progression.computed = SP_CSS_BLOCK_PROGRESSION_TB;
2737     style->writing_mode.set = FALSE;
2738     style->writing_mode.value = style->writing_mode.computed = SP_CSS_WRITING_MODE_LR_TB;
2740     style->text_anchor.set = FALSE;
2741     style->text_anchor.value = style->text_anchor.computed = SP_CSS_TEXT_ANCHOR_START;
2744     style->opacity.value = SP_SCALE24_MAX;
2745     style->visibility.set = FALSE;
2746     style->visibility.value = style->visibility.computed = SP_CSS_VISIBILITY_VISIBLE;
2747     style->display.set = FALSE;
2748     style->display.value = style->display.computed = SP_CSS_DISPLAY_INLINE;
2749     style->overflow.set = FALSE;
2750     style->overflow.value = style->overflow.computed = SP_CSS_OVERFLOW_VISIBLE;
2752     style->color.clear();
2753     style->color.setColor(0.0, 0.0, 0.0);
2755     style->fill.clear();
2756     style->fill.setColor(0.0, 0.0, 0.0);
2757     style->fill_opacity.value = SP_SCALE24_MAX;
2758     style->fill_rule.value = style->fill_rule.computed = SP_WIND_RULE_NONZERO;
2760     style->stroke.clear();
2761     style->stroke_opacity.value = SP_SCALE24_MAX;
2763     style->stroke_width.set = FALSE;
2764     style->stroke_width.unit = SP_CSS_UNIT_NONE;
2765     style->stroke_width.computed = 1.0;
2767     style->stroke_linecap.set = FALSE;
2768     style->stroke_linecap.value = style->stroke_linecap.computed = SP_STROKE_LINECAP_BUTT;
2769     style->stroke_linejoin.set = FALSE;
2770     style->stroke_linejoin.value = style->stroke_linejoin.computed = SP_STROKE_LINEJOIN_MITER;
2772     style->stroke_miterlimit.set = FALSE;
2773     style->stroke_miterlimit.value = 4.0;
2775     style->stroke_dash.n_dash = 0;
2776     style->stroke_dash.dash = NULL;
2777     style->stroke_dash.offset = 0.0;
2779     for (unsigned i = SP_MARKER_LOC; i < SP_MARKER_LOC_QTY; i++) {
2780         g_free(style->marker[i].value);
2781         style->marker[i].set = FALSE;
2782     }
2784     style->enable_background.value = SP_CSS_BACKGROUND_ACCUMULATE;
2785     style->enable_background.set = false;
2786     style->enable_background.inherit = false;
2791 /**
2792  *
2793  */
2794 static void
2795 sp_style_read_dash(SPStyle *style, gchar const *str)
2797     /* Ref: http://www.w3.org/TR/SVG11/painting.html#StrokeDasharrayProperty */
2798     style->stroke_dasharray_set = TRUE;
2800     if (strcmp(str, "inherit") == 0) {
2801         style->stroke_dasharray_inherit = true;
2802         return;
2803     }
2804     style->stroke_dasharray_inherit = false;
2806     NRVpathDash &dash = style->stroke_dash;
2807     g_free(dash.dash);
2808     dash.dash = NULL;
2810     if (strcmp(str, "none") == 0) {
2811         dash.n_dash = 0;
2812         return;
2813     }
2815     gint n_dash = 0;
2816     gdouble d[64];
2817     gchar *e = NULL;
2819     bool LineSolid=true;
2820     while (e != str && n_dash < 64) {
2821         /* TODO: Should allow <length> rather than just a unitless (px) number. */
2822         d[n_dash] = g_ascii_strtod(str, (char **) &e);
2823         if (d[n_dash] > 0.00000001)
2824             LineSolid = false;
2825         if (e != str) {
2826             n_dash += 1;
2827             str = e;
2828         }
2829         while (str && *str && !isalnum(*str)) str += 1;
2830     }
2832     if (LineSolid) {
2833         dash.n_dash = 0;
2834         return;
2835     }
2837     if (n_dash > 0) {
2838         dash.dash = g_new(gdouble, n_dash);
2839         memcpy(dash.dash, d, sizeof(gdouble) * n_dash);
2840         dash.n_dash = n_dash;
2841     }
2845 /*#########################
2846 ## SPTextStyle operations
2847 #########################*/
2850 /**
2851  * Return new SPTextStyle object with default settings.
2852  */
2853 static SPTextStyle *
2854 sp_text_style_new()
2856     SPTextStyle *ts = g_new0(SPTextStyle, 1);
2857     ts->refcount = 1;
2858     sp_text_style_clear(ts);
2860     ts->font_specification.value = g_strdup("Sans");
2861     ts->font.value = g_strdup("Sans");
2862     ts->font_family.value = g_strdup("Sans");
2864     return ts;
2868 /**
2869  * Clear text style settings.
2870  */
2871 static void
2872 sp_text_style_clear(SPTextStyle *ts)
2874     ts->font_specification.set = FALSE;
2875     ts->font.set = FALSE;
2876     ts->font_family.set = FALSE;
2881 /**
2882  * Reduce refcount of text style and possibly free it.
2883  */
2884 static SPTextStyle *
2885 sp_text_style_unref(SPTextStyle *st)
2887     st->refcount -= 1;
2889     if (st->refcount < 1) {
2890         g_free(st->font_specification.value);
2891         g_free(st->font.value);
2892         g_free(st->font_family.value);
2893         g_free(st);
2894     }
2896     return NULL;
2901 /**
2902  * Return duplicate of text style.
2903  */
2904 static SPTextStyle *
2905 sp_text_style_duplicate_unset(SPTextStyle *st)
2907     SPTextStyle *nt = g_new0(SPTextStyle, 1);
2908     nt->refcount = 1;
2910     nt->font_specification.value = g_strdup(st->font_specification.value);
2911     nt->font.value = g_strdup(st->font.value);
2912     nt->font_family.value = g_strdup(st->font_family.value);
2914     return nt;
2919 /**
2920  * Write SPTextStyle object into string.
2921  */
2922 static guint
2923 sp_text_style_write(gchar *p, guint const len, SPTextStyle const *const st, guint flags)
2925     gint d = 0;
2927     // We do not do diffing for text style
2928     if (flags == SP_STYLE_FLAG_IFDIFF)
2929         flags = SP_STYLE_FLAG_IFSET;
2931     d += sp_style_write_istring(p + d, len - d, "font-family", &st->font_family, NULL, flags);
2932     d += sp_style_write_istring(p + d, len - d, "-inkscape-font-specification", &st->font_specification, NULL, flags);
2933     return d;
2938 /* The following sp_tyle_read_* functions ignore invalid values, as per
2939  * http://www.w3.org/TR/REC-CSS2/syndata.html#parsing-errors.
2940  *
2941  * [However, the SVG spec is somewhat unclear as to whether the style attribute should
2942  * be handled as per CSS2 rules or whether it must simply be a set of PROPERTY:VALUE
2943  * pairs, in which case SVG's error-handling rules
2944  * http://www.w3.org/TR/SVG11/implnote.html#ErrorProcessing should instead be applied.]
2945  */
2948 /**
2949  * Set SPIFloat object from string.
2950  */
2951 static void
2952 sp_style_read_ifloat(SPIFloat *val, gchar const *str)
2954     if (!strcmp(str, "inherit")) {
2955         val->set = TRUE;
2956         val->inherit = TRUE;
2957     } else {
2958         gfloat value;
2959         if (sp_svg_number_read_f(str, &value)) {
2960             val->set = TRUE;
2961             val->inherit = FALSE;
2962             val->value = value;
2963         }
2964     }
2969 /**
2970  * Set SPIScale24 object from string.
2971  */
2972 static void
2973 sp_style_read_iscale24(SPIScale24 *val, gchar const *str)
2975     if (!strcmp(str, "inherit")) {
2976         val->set = TRUE;
2977         val->inherit = TRUE;
2978     } else {
2979         gfloat value;
2980         if (sp_svg_number_read_f(str, &value)) {
2981             val->set = TRUE;
2982             val->inherit = FALSE;
2983             value = CLAMP(value, 0.0, 1.0);
2984             val->value = SP_SCALE24_FROM_FLOAT(value);
2985         }
2986     }
2989 /**
2990  * Reads a style value and performs lookup based on the given style value enumerations.
2991  */
2992 static void
2993 sp_style_read_ienum(SPIEnum *val, gchar const *str, SPStyleEnum const *dict,
2994                     bool const can_explicitly_inherit)
2996     if ( can_explicitly_inherit && !strcmp(str, "inherit") ) {
2997         val->set = TRUE;
2998         val->inherit = TRUE;
2999     } else {
3000         for (unsigned i = 0; dict[i].key; i++) {
3001             if (!strcmp(str, dict[i].key)) {
3002                 val->set = TRUE;
3003                 val->inherit = FALSE;
3004                 val->value = dict[i].value;
3005                 /* Save copying for values not needing it */
3006                 val->computed = val->value;
3007                 break;
3008             }
3009         }
3010     }
3015 /**
3016  * Set SPIString object from string.
3017  */
3018 static void
3019 sp_style_read_istring(SPIString *val, gchar const *str)
3021     g_free(val->value);
3023     if (!strcmp(str, "inherit")) {
3024         val->set = TRUE;
3025         val->inherit = TRUE;
3026         val->value = NULL;
3027     } else {
3028         val->set = TRUE;
3029         val->inherit = FALSE;
3030         val->value = g_strdup(str);
3031     }
3036 /**
3037  * Set SPILength object from string.
3038  */
3039 static void
3040 sp_style_read_ilength(SPILength *val, gchar const *str)
3042     if (!strcmp(str, "inherit")) {
3043         val->set = TRUE;
3044         val->inherit = TRUE;
3045     } else {
3046         gdouble value;
3047         gchar *e;
3048         /** \todo fixme: Move this to standard place (Lauris) */
3049         value = g_ascii_strtod(str, &e);
3050         if ((gchar const *) e != str) {
3051             /** \todo
3052              * Allow the number of px per inch to vary (document preferences,
3053              * X server or whatever).  E.g. don't fill in computed here, do
3054              * it at the same time as percentage units are done.
3055              */
3056             if (!*e) {
3057                 /* Userspace */
3058                 val->unit = SP_CSS_UNIT_NONE;
3059                 val->computed = value;
3060             } else if (!strcmp(e, "px")) {
3061                 /* Userspace */
3062                 val->unit = SP_CSS_UNIT_PX;
3063                 val->computed = value;
3064             } else if (!strcmp(e, "pt")) {
3065                 /* Userspace / DEVICESCALE */
3066                 val->unit = SP_CSS_UNIT_PT;
3067                 val->computed = value * PX_PER_PT;
3068             } else if (!strcmp(e, "pc")) {
3069                 /* 1 pica = 12pt; FIXME: add it to SPUnit */
3070                 val->unit = SP_CSS_UNIT_PC;
3071                 val->computed = value * PX_PER_PT * 12;
3072             } else if (!strcmp(e, "mm")) {
3073                 val->unit = SP_CSS_UNIT_MM;
3074                 val->computed = value * PX_PER_MM;
3075             } else if (!strcmp(e, "cm")) {
3076                 val->unit = SP_CSS_UNIT_CM;
3077                 val->computed = value * PX_PER_CM;
3078             } else if (!strcmp(e, "in")) {
3079                 val->unit = SP_CSS_UNIT_IN;
3080                 val->computed = value * PX_PER_IN;
3081             } else if (!strcmp(e, "em")) {
3082                 /* EM square */
3083                 val->unit = SP_CSS_UNIT_EM;
3084                 val->value = value;
3085             } else if (!strcmp(e, "ex")) {
3086                 /* ex square */
3087                 val->unit = SP_CSS_UNIT_EX;
3088                 val->value = value;
3089             } else if (!strcmp(e, "%")) {
3090                 /* Percentage */
3091                 val->unit = SP_CSS_UNIT_PERCENT;
3092                 val->value = value * 0.01;
3093             } else {
3094                 /* Invalid */
3095                 return;
3096             }
3097             val->set = TRUE;
3098             val->inherit = FALSE;
3099         }
3100     }
3103 /**
3104  * Set SPILengthOrNormal object from string.
3105  */
3106 static void
3107 sp_style_read_ilengthornormal(SPILengthOrNormal *val, gchar const *str)
3109     if (!strcmp(str, "normal")) {
3110         val->set = TRUE;
3111         val->inherit = FALSE;
3112         val->normal = TRUE;
3113         val->unit = SP_CSS_UNIT_NONE;
3114         val->value = val->computed = 0.0;
3115     } else {
3116         SPILength length;
3117         sp_style_read_ilength(&length, str);
3118         val->set = length.set;
3119         val->inherit = length.inherit;
3120         val->normal = FALSE;
3121         val->unit = length.unit;
3122         val->value = length.value;
3123         val->computed = length.computed;
3124     }
3127 /**
3128  * Set SPITextDecoration object from string.
3129  */
3130 static void
3131 sp_style_read_itextdecoration(SPITextDecoration *val, gchar const *str)
3133     if (!strcmp(str, "inherit")) {
3134         val->set = TRUE;
3135         val->inherit = TRUE;
3136     } else if (!strcmp(str, "none")) {
3137         val->set = TRUE;
3138         val->inherit = FALSE;
3139         val->underline = FALSE;
3140         val->overline = FALSE;
3141         val->line_through = FALSE;
3142         val->blink = FALSE;
3143     } else {
3144         bool found_underline = false;
3145         bool found_overline = false;
3146         bool found_line_through = false;
3147         bool found_blink = false;
3148         for ( ; *str ; str++ ) {
3149             if (*str == ' ') continue;
3150             if (strneq(str, "underline", 9) && (str[9] == ' ' || str[9] == '\0')) {
3151                 found_underline = true;
3152                 str += 9;
3153             } else if (strneq(str, "overline", 8) && (str[8] == ' ' || str[8] == '\0')) {
3154                 found_overline = true;
3155                 str += 8;
3156             } else if (strneq(str, "line-through", 12) && (str[12] == ' ' || str[12] == '\0')) {
3157                 found_line_through = true;
3158                 str += 12;
3159             } else if (strneq(str, "blink", 5) && (str[5] == ' ' || str[5] == '\0')) {
3160                 found_blink = true;
3161                 str += 5;
3162             } else {
3163                 return;  // invalid value
3164             }
3165         }
3166         if (!(found_underline || found_overline || found_line_through || found_blink)) {
3167             return;  // invalid value: empty
3168         }
3169         val->set = TRUE;
3170         val->inherit = FALSE;
3171         val->underline = found_underline;
3172         val->overline = found_overline;
3173         val->line_through = found_line_through;
3174         val->blink = found_blink;
3175     }
3178 /**
3179  * Set SPIPaint object from string containing an integer value.
3180  * \param document Ignored
3181  */
3182 static void
3183 sp_style_read_icolor(SPIPaint *paint, gchar const *str, SPStyle *style, SPDocument *document)
3185     (void)style; // TODO
3186     (void)document; // TODO
3187     paint->currentcolor = FALSE;  /* currentColor not a valid <color>. */
3188     if (!strcmp(str, "inherit")) {
3189         paint->set = TRUE;
3190         paint->inherit = TRUE;
3191     } else {
3192         guint32 const rgb0 = sp_svg_read_color(str, 0xff);
3193         if (rgb0 != 0xff) {
3194             paint->setColor(rgb0);
3195             paint->set = TRUE;
3196             paint->inherit = FALSE;
3197         }
3198     }
3202 /**
3203  * Set SPIPaint object from string.
3204  *
3205  * \pre paint == \&style.fill || paint == \&style.stroke.
3206  */
3207 void SPIPaint::read( gchar const *str, SPStyle &style, SPDocument *document )
3209     while (g_ascii_isspace(*str)) {
3210         ++str;
3211     }
3213     clear();
3215     if (streq(str, "inherit")) {
3216         set = TRUE;
3217         inherit = TRUE;
3218     } else {
3219         if ( strneq(str, "url", 3) ) {
3220             gchar *uri = extract_uri( str, &str );
3221             while ( g_ascii_isspace(*str) ) {
3222                 ++str;
3223             }
3224             // TODO check on and comment the comparrison "paint != &style->color".
3225             if ( uri && *uri && (this != &style.color) ) {
3226                 set = TRUE;
3228                 // it may be that this style's SPIPaint has not yet created its URIReference;
3229                 // now that we have a document, we can create it here
3230                 if (!value.href && document) {
3231                     value.href = new SPPaintServerReference(document);
3232                     value.href->changedSignal().connect(sigc::bind(sigc::ptr_fun((this == &style.fill)? sp_style_fill_paint_server_ref_changed : sp_style_stroke_paint_server_ref_changed), &style));
3233                 }
3235                 // TODO check what this does in light of move away from union
3236                 sp_style_set_ipaint_to_uri_string (&style, this, uri);
3237             }
3238             g_free( uri );
3239         }
3241         if (streq(str, "currentColor") && (this != &style.color)) {
3242             set = TRUE;
3243             currentcolor = TRUE;
3244         } else if (streq(str, "none") && (this != &style.color)) {
3245             set = TRUE;
3246             noneSet = TRUE;
3247         } else {
3248             guint32 const rgb0 = sp_svg_read_color(str, &str, 0xff);
3249             if (rgb0 != 0xff) {
3250                 setColor( rgb0 );
3251                 set = TRUE;
3253                 while (g_ascii_isspace(*str)) {
3254                     ++str;
3255                 }
3256                 if (strneq(str, "icc-color(", 10)) {
3257                     SVGICCColor* tmp = new SVGICCColor();
3258                     if ( ! sp_svg_read_icc_color( str, &str, tmp ) ) {
3259                         delete tmp;
3260                         tmp = 0;
3261                     }
3262                     value.color.icc = tmp;
3263                 }
3264             }
3265         }
3266     }
3271 /**
3272  * Set SPIFontSize object from string.
3273  */
3274 static void
3275 sp_style_read_ifontsize(SPIFontSize *val, gchar const *str)
3277     if (!strcmp(str, "inherit")) {
3278         val->set = TRUE;
3279         val->inherit = TRUE;
3280     } else if ((*str == 'x') || (*str == 's') || (*str == 'm') || (*str == 'l')) {
3281         // xx-small, x-small, etc.
3282         for (unsigned i = 0; enum_font_size[i].key; i++) {
3283             if (!strcmp(str, enum_font_size[i].key)) {
3284                 val->set = TRUE;
3285                 val->inherit = FALSE;
3286                 val->type = SP_FONT_SIZE_LITERAL;
3287                 val->value = enum_font_size[i].value;
3288                 return;
3289             }
3290         }
3291         /* Invalid */
3292         return;
3293     } else {
3294         gdouble value;
3295         gchar *e;
3296         /* fixme: Move this to standard place (Lauris) */
3297         value = g_ascii_strtod(str, &e);
3298         if ((gchar const *) e != str) {
3299             if (!*e) {
3300                 /* Userspace */
3301             } else if (!strcmp(e, "px")) {
3302                 /* Userspace */
3303             } else if (!strcmp(e, "pt")) {
3304                 /* Userspace * DEVICESCALE */
3305                 value *= PX_PER_PT;
3306             } else if (!strcmp(e, "pc")) {
3307                 /* 12pt */
3308                 value *= PX_PER_PT * 12.0;
3309             } else if (!strcmp(e, "mm")) {
3310                 value *= PX_PER_MM;
3311             } else if (!strcmp(e, "cm")) {
3312                 value *= PX_PER_CM;
3313             } else if (!strcmp(e, "in")) {
3314                 value *= PX_PER_IN;
3315             } else if (!strcmp(e, "%")) {
3316                 /* Percentage */
3317                 val->set = TRUE;
3318                 val->inherit = FALSE;
3319                 val->type = SP_FONT_SIZE_PERCENTAGE;
3320                 val->value = SP_F8_16_FROM_FLOAT(value / 100.0);
3321                 return;
3322             } else {
3323                 /* Invalid */
3324                 return;
3325             }
3326             /* Length */
3327             val->set = TRUE;
3328             val->inherit = FALSE;
3329             val->type = SP_FONT_SIZE_LENGTH;
3330             val->computed = value;
3331             return;
3332         }
3333     }
3337 /**
3338  * Set SPIBaselineShift object from string.
3339  */
3340 static void
3341 sp_style_read_ibaselineshift(SPIBaselineShift *val, gchar const *str)
3343     if (!strcmp(str, "inherit")) {
3344         val->set = TRUE;
3345         val->inherit = TRUE;
3346     } else if ((*str == 'b') || (*str == 's')) {
3347         // baseline or sub or super
3348         for (unsigned i = 0; enum_baseline_shift[i].key; i++) {
3349             if (!strcmp(str, enum_baseline_shift[i].key)) {
3350                 val->set = TRUE;
3351                 val->inherit = FALSE;
3352                 val->type = SP_BASELINE_SHIFT_LITERAL;
3353                 val->literal = enum_baseline_shift[i].value;
3354                 return;
3355             }
3356         }
3357         /* Invalid */
3358         return;
3359     } else {
3360         SPILength length;
3361         sp_style_read_ilength(&length, str);
3362         val->set      = length.set;
3363         val->inherit  = length.inherit;
3364         val->unit     = length.unit;
3365         val->value    = length.value;
3366         val->computed = length.computed;
3367         if( val->unit == SP_CSS_UNIT_PERCENT ) {
3368             val->type = SP_BASELINE_SHIFT_PERCENTAGE;
3369         } else {
3370             val->type = SP_BASELINE_SHIFT_LENGTH;
3371         }
3372         return;
3373     }
3377 /**
3378  * Set SPIFilter object from string.
3379  */
3380 static void
3381 sp_style_read_ifilter(gchar const *str, SPStyle * style, SPDocument *document)
3383     SPIFilter *f = &(style->filter);
3384     /* Try all possible values: inherit, none, uri */
3385     if (streq(str, "inherit")) {
3386         f->set = TRUE;
3387         f->inherit = TRUE;
3388         if (f->href && f->href->getObject())
3389             f->href->detach();
3390     } else if(streq(str, "none")) {
3391         f->set = TRUE;
3392         f->inherit = FALSE;
3393         if (f->href && f->href->getObject())
3394            f->href->detach();
3395     } else if (strneq(str, "url", 3)) {
3396         char *uri = extract_uri(str);
3397         if(uri == NULL || uri[0] == '\0') {
3398             g_warning("Specified filter url is empty");
3399             f->set = TRUE;
3400             f->inherit = FALSE;
3401             return;
3402         }
3403         f->set = TRUE;
3404         f->inherit = FALSE;
3405         if (f->href && f->href->getObject())
3406             f->href->detach();
3408         // it may be that this style has not yet created its SPFilterReference;
3409         // now that we have a document, we can create it here
3410         if (!f->href && document) {
3411             f->href = new SPFilterReference(document);
3412             f->href->changedSignal().connect(sigc::bind(sigc::ptr_fun(sp_style_filter_ref_changed), style));
3413         }
3415         try {
3416             f->href->attach(Inkscape::URI(uri));
3417         } catch (Inkscape::BadURIException &e) {
3418             g_warning("%s", e.what());
3419             f->href->detach();
3420         }
3421         g_free (uri);
3423     } else {
3424         /* We shouldn't reach this if SVG input is well-formed */
3425         f->set = FALSE;
3426         f->inherit = FALSE;
3427         if (f->href && f->href->getObject())
3428             f->href->detach();
3429     }
3432 /**
3433  * Set SPIEnum object from repr attribute.
3434  */
3435 static void
3436 sp_style_read_penum(SPIEnum *val, Inkscape::XML::Node *repr,
3437                     gchar const *key, SPStyleEnum const *dict,
3438                     bool const can_explicitly_inherit)
3440     gchar const *str = repr->attribute(key);
3441     if (str) {
3442         sp_style_read_ienum(val, str, dict, can_explicitly_inherit);
3443     }
3448 /**
3449  * Set SPILength object from repr attribute.
3450  */
3451 static void
3452 sp_style_read_plength(SPILength *val, Inkscape::XML::Node *repr, gchar const *key)
3454     gchar const *str = repr->attribute(key);
3455     if (str) {
3456         sp_style_read_ilength(val, str);
3457     }
3460 /**
3461  * Set SPIFontSize object from repr attribute.
3462  */
3463 static void
3464 sp_style_read_pfontsize(SPIFontSize *val, Inkscape::XML::Node *repr, gchar const *key)
3466     gchar const *str = repr->attribute(key);
3467     if (str) {
3468         sp_style_read_ifontsize(val, str);
3469     }
3473 /**
3474  * Set SPIBaselineShift object from repr attribute.
3475  */
3476 static void
3477 sp_style_read_pbaselineshift(SPIBaselineShift *val, Inkscape::XML::Node *repr, gchar const *key)
3479     gchar const *str = repr->attribute(key);
3480     if (str) {
3481         sp_style_read_ibaselineshift(val, str);
3482     }
3486 /**
3487  * Set SPIFloat object from repr attribute.
3488  */
3489 static void
3490 sp_style_read_pfloat(SPIFloat *val, Inkscape::XML::Node *repr, gchar const *key)
3492     gchar const *str = repr->attribute(key);
3493     if (str) {
3494         sp_style_read_ifloat(val, str);
3495     }
3499 /**
3500  * Write SPIFloat object into string.
3501  */
3502 static gint
3503 sp_style_write_ifloat(gchar *p, gint const len, gchar const *const key,
3504                       SPIFloat const *const val, SPIFloat const *const base, guint const flags)
3506     Inkscape::CSSOStringStream os;
3508     if ((flags & SP_STYLE_FLAG_ALWAYS)
3509         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
3510         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set
3511             && (!base->set || (val->value != base->value))))
3512     {
3513         if (val->inherit) {
3514             return g_snprintf(p, len, "%s:inherit;", key);
3515         } else {
3516             os << key << ":" << val->value << ";";
3517             return g_strlcpy(p, os.str().c_str(), len);
3518         }
3519     }
3520     return 0;
3524 /**
3525  * Write SPIScale24 object into string.
3526  */
3527 static gint
3528 sp_style_write_iscale24(gchar *p, gint const len, gchar const *const key,
3529                         SPIScale24 const *const val, SPIScale24 const *const base,
3530                         guint const flags)
3532     Inkscape::CSSOStringStream os;
3534     if ((flags & SP_STYLE_FLAG_ALWAYS)
3535         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
3536         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set
3537             && (!base->set || (val->value != base->value))))
3538     {
3539         if (val->inherit) {
3540             return g_snprintf(p, len, "%s:inherit;", key);
3541         } else {
3542             os << key << ":" << SP_SCALE24_TO_FLOAT(val->value) << ";";
3543             return g_strlcpy(p, os.str().c_str(), len);
3544         }
3545     }
3546     return 0;
3550 /**
3551  * Write SPIEnum object into string.
3552  */
3553 static gint
3554 sp_style_write_ienum(gchar *p, gint const len, gchar const *const key,
3555                      SPStyleEnum const *const dict,
3556                      SPIEnum const *const val, SPIEnum const *const base, guint const flags)
3558     if ((flags & SP_STYLE_FLAG_ALWAYS)
3559         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
3560         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set
3561             && (!base->set || (val->computed != base->computed))))
3562     {
3563         if (val->inherit) {
3564             return g_snprintf(p, len, "%s:inherit;", key);
3565         }
3566         for (unsigned i = 0; dict[i].key; i++) {
3567             if (dict[i].value == static_cast< gint > (val->value) ) {
3568                 return g_snprintf(p, len, "%s:%s;", key, dict[i].key);
3569             }
3570         }
3571     }
3572     return 0;
3577 /**
3578  * Write SPIString object into string.
3579  */
3580 static gint
3581 sp_style_write_istring(gchar *p, gint const len, gchar const *const key,
3582                        SPIString const *const val, SPIString const *const base, guint const flags)
3584     if ((flags & SP_STYLE_FLAG_ALWAYS)
3585         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
3586         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set
3587             && (!base->set || strcmp(val->value, base->value))))
3588     {
3589         if (val->inherit) {
3590             return g_snprintf(p, len, "%s:inherit;", key);
3591         } else {
3592             gchar *val_quoted = css2_escape_quote(val->value);
3593             if (val_quoted) {
3594                 return g_snprintf(p, len, "%s:%s;", key, val_quoted);
3595                 g_free (val_quoted);
3596             }
3597         }
3598     }
3599     return 0;
3603 /**
3604  *
3605  */
3606 static bool
3607 sp_length_differ(SPILength const *const a, SPILength const *const b)
3609     if (a->unit != b->unit) {
3610         if (a->unit == SP_CSS_UNIT_EM) return true;
3611         if (a->unit == SP_CSS_UNIT_EX) return true;
3612         if (a->unit == SP_CSS_UNIT_PERCENT) return true;
3613         if (b->unit == SP_CSS_UNIT_EM) return true;
3614         if (b->unit == SP_CSS_UNIT_EX) return true;
3615         if (b->unit == SP_CSS_UNIT_PERCENT) return true;
3616     }
3618     return (a->computed != b->computed);
3623 /**
3624  * Write SPILength object into string.
3625  */
3626 static gint
3627 sp_style_write_ilength(gchar *p, gint const len, gchar const *const key,
3628                        SPILength const *const val, SPILength const *const base, guint const flags)
3630     Inkscape::CSSOStringStream os;
3632     if ((flags & SP_STYLE_FLAG_ALWAYS)
3633         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
3634         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set
3635             && (!base->set || sp_length_differ(val, base))))
3636     {
3637         if (val->inherit) {
3638             return g_snprintf(p, len, "%s:inherit;", key);
3639         } else {
3640             switch (val->unit) {
3641                 case SP_CSS_UNIT_NONE:
3642                     os << key << ":" << val->computed << ";";
3643                     return g_strlcpy(p, os.str().c_str(), len);
3644                     break;
3645                 case SP_CSS_UNIT_PX:
3646                     os << key << ":" << val->computed << "px;";
3647                     return g_strlcpy(p, os.str().c_str(), len);
3648                     break;
3649                 case SP_CSS_UNIT_PT:
3650                     os << key << ":" << val->computed * PT_PER_PX << "pt;";
3651                     return g_strlcpy(p, os.str().c_str(), len);
3652                     break;
3653                 case SP_CSS_UNIT_PC:
3654                     os << key << ":" << val->computed * PT_PER_PX / 12.0 << "pc;";
3655                     return g_strlcpy(p, os.str().c_str(), len);
3656                     break;
3657                 case SP_CSS_UNIT_MM:
3658                     os << key << ":" << val->computed * MM_PER_PX << "mm;";
3659                     return g_strlcpy(p, os.str().c_str(), len);
3660                     break;
3661                 case SP_CSS_UNIT_CM:
3662                     os << key << ":" << val->computed * CM_PER_PX << "cm;";
3663                     return g_strlcpy(p, os.str().c_str(), len);
3664                     break;
3665                 case SP_CSS_UNIT_IN:
3666                     os << key << ":" << val->computed * IN_PER_PX << "in;";
3667                     return g_strlcpy(p, os.str().c_str(), len);
3668                     break;
3669                 case SP_CSS_UNIT_EM:
3670                     os << key << ":" << val->value << "em;";
3671                     return g_strlcpy(p, os.str().c_str(), len);
3672                     break;
3673                 case SP_CSS_UNIT_EX:
3674                     os << key << ":" << val->value << "ex;";
3675                     return g_strlcpy(p, os.str().c_str(), len);
3676                     break;
3677                 case SP_CSS_UNIT_PERCENT:
3678                     os << key << ":" << (val->value * 100.0) << "%;";
3679                     return g_strlcpy(p, os.str().c_str(), len);
3680                     break;
3681                 default:
3682                     /* Invalid */
3683                     break;
3684             }
3685         }
3686     }
3687     return 0;
3691 /**
3692  *
3693  */
3694 static bool
3695 sp_lengthornormal_differ(SPILengthOrNormal const *const a, SPILengthOrNormal const *const b)
3697     if (a->normal != b->normal) return true;
3698     if (a->normal) return false;
3700     if (a->unit != b->unit) {
3701         if (a->unit == SP_CSS_UNIT_EM) return true;
3702         if (a->unit == SP_CSS_UNIT_EX) return true;
3703         if (a->unit == SP_CSS_UNIT_PERCENT) return true;
3704         if (b->unit == SP_CSS_UNIT_EM) return true;
3705         if (b->unit == SP_CSS_UNIT_EX) return true;
3706         if (b->unit == SP_CSS_UNIT_PERCENT) return true;
3707     }
3709     return (a->computed != b->computed);
3712 /**
3713  * Write SPILengthOrNormal object into string.
3714  */
3715 static gint
3716 sp_style_write_ilengthornormal(gchar *p, gint const len, gchar const *const key,
3717                                SPILengthOrNormal const *const val,
3718                                SPILengthOrNormal const *const base,
3719                                guint const flags)
3721     if ((flags & SP_STYLE_FLAG_ALWAYS)
3722         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
3723         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set
3724             && (!base->set || sp_lengthornormal_differ(val, base))))
3725     {
3726         if (val->normal) {
3727             return g_snprintf(p, len, "%s:normal;", key);
3728         } else {
3729             SPILength length;
3730             length.set = val->set;
3731             length.inherit = val->inherit;
3732             length.unit = val->unit;
3733             length.value = val->value;
3734             length.computed = val->computed;
3735             return sp_style_write_ilength(p, len, key, &length, NULL, SP_STYLE_FLAG_ALWAYS);
3736         }
3737     }
3738     return 0;
3741 /**
3742  *
3743  */
3744 static bool
3745 sp_textdecoration_differ(SPITextDecoration const *const a, SPITextDecoration const *const b)
3747     return    a->underline != b->underline
3748            || a->overline != b->overline
3749            || a->line_through != b->line_through
3750            || a->blink != b->blink;
3753 /**
3754  * Write SPITextDecoration object into string.
3755  */
3756 static gint
3757 sp_style_write_itextdecoration(gchar *p, gint const len, gchar const *const key,
3758                                SPITextDecoration const *const val,
3759                                SPITextDecoration const *const base,
3760                                guint const flags)
3762     Inkscape::CSSOStringStream os;
3764     if ((flags & SP_STYLE_FLAG_ALWAYS)
3765         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
3766         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set
3767             && (!base->set || sp_textdecoration_differ(val, base))))
3768     {
3769         if (val->inherit) {
3770             return g_snprintf(p, len, "%s:inherit;", key);
3771         } else {
3772             os << key << ":";
3773             if (val->underline || val->overline || val->line_through || val->blink) {
3774                 if (val->underline) os << " underline";
3775                 if (val->overline) os << " overline";
3776                 if (val->line_through) os << " line-through";
3777                 if (val->blink) os << " blink";
3778             } else
3779                 os << "none";
3780             os << ";";
3781             return g_strlcpy(p, os.str().c_str(), len);
3782         }
3783     }
3784     return 0;
3787 /**
3788  *
3789  */
3790 static bool
3791 sp_paint_differ(SPIPaint const *const a, SPIPaint const *const b)
3793     if ( (a->isColor() != b->isColor())
3794          || (a->isPaintserver() != b->isPaintserver())
3795          || (a->set != b->set)
3796          || (a->currentcolor != b->currentcolor)
3797          || (a->inherit!= b->inherit) ) {
3798         return true;
3799     }
3801     // TODO refactor to allow for mixed paints (rgb() *and* url(), etc)
3803     if ( a->isPaintserver() ) {
3804         return (a->value.href == NULL || b->value.href == NULL || a->value.href->getObject() != b->value.href->getObject());
3805     }
3807     if ( a->isColor() ) {
3808         return !( (a->value.color == b->value.color)
3809                  && ((a->value.color.icc == b->value.color.icc)
3810                      || (a->value.color.icc && b->value.color.icc
3811                          && (a->value.color.icc->colorProfile == b->value.color.icc->colorProfile)
3812                          && (a->value.color.icc->colors == b->value.color.icc->colors))));
3813     /* todo: Allow for epsilon differences in iccColor->colors, e.g. changes small enough not to show up
3814      * in the string representation. */
3815     }
3817     return false;
3822 /**
3823  * Write SPIPaint object into string.
3824  */
3825 static gint
3826 sp_style_write_ipaint(gchar *b, gint const len, gchar const *const key,
3827                       SPIPaint const *const paint, SPIPaint const *const base, guint const flags)
3829     int retval = 0;
3831     if ((flags & SP_STYLE_FLAG_ALWAYS)
3832         || ((flags & SP_STYLE_FLAG_IFSET) && paint->set)
3833         || ((flags & SP_STYLE_FLAG_IFDIFF) && paint->set
3834             && (!base->set || sp_paint_differ(paint, base))))
3835     {
3836         CSSOStringStream css;
3838         if (paint->inherit) {
3839             css << "inherit";
3840         } else {
3841             if ( paint->value.href && paint->value.href->getURI() ) {
3842                 const gchar* uri = paint->value.href->getURI()->toString();
3843                 css << "url(" << uri << ")";
3844             }
3846             if ( paint->noneSet ) {
3847                 if ( !css.str().empty() ) {
3848                     css << " ";
3849                 }
3850                 css << "none";
3851             }
3853             if ( paint->currentcolor ) {
3854                 if ( !css.str().empty() ) {
3855                     css << " ";
3856                 }
3857                 css << "currentColor";
3858             }
3860             if ( paint->colorSet && !paint->currentcolor ) {
3861                 if ( !css.str().empty() ) {
3862                     css << " ";
3863                 }
3864                 char color_buf[8];
3865                 sp_svg_write_color(color_buf, sizeof(color_buf), paint->value.color.toRGBA32( 0 ));
3866                 css << color_buf;
3867             }
3869             if (paint->value.color.icc && !paint->currentcolor) {
3870                 if ( !css.str().empty() ) {
3871                     css << " ";
3872                 }
3873                 css << "icc-color(" << paint->value.color.icc->colorProfile;
3874                 for (vector<double>::const_iterator i(paint->value.color.icc->colors.begin()),
3875                          iEnd(paint->value.color.icc->colors.end());
3876                      i != iEnd; ++i) {
3877                     css << ", " << *i;
3878                 }
3879                 css << ')';
3880             }
3881         }
3883         if ( !css.str().empty() ) {
3884             retval = g_snprintf( b, len, "%s:%s;", key, css.str().c_str() );
3885         }
3886     }
3888     return retval;
3892 /**
3893  *
3894  */
3895 static bool
3896 sp_fontsize_differ(SPIFontSize const *const a, SPIFontSize const *const b)
3898     if (a->type != b->type)
3899         return true;
3900     if (a->type == SP_FONT_SIZE_LENGTH) {
3901         if (a->computed != b->computed)
3902             return true;
3903     } else {
3904         if (a->value != b->value)
3905             return true;
3906     }
3907     return false;
3911 /**
3912  * Write SPIFontSize object into string.
3913  */
3914 static gint
3915 sp_style_write_ifontsize(gchar *p, gint const len, gchar const *key,
3916                          SPIFontSize const *const val, SPIFontSize const *const base,
3917                          guint const flags)
3919     if ((flags & SP_STYLE_FLAG_ALWAYS)
3920         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
3921         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set
3922             && (!base->set || sp_fontsize_differ(val, base))))
3923     {
3924         if (val->inherit) {
3925             return g_snprintf(p, len, "%s:inherit;", key);
3926         } else if (val->type == SP_FONT_SIZE_LITERAL) {
3927             for (unsigned i = 0; enum_font_size[i].key; i++) {
3928                 if (enum_font_size[i].value == static_cast< gint > (val->value) ) {
3929                     return g_snprintf(p, len, "%s:%s;", key, enum_font_size[i].key);
3930                 }
3931             }
3932         } else if (val->type == SP_FONT_SIZE_LENGTH) {
3933             Inkscape::CSSOStringStream os;
3934             os << key << ":" << val->computed << "px;";      // must specify px, see inkscape bug 1221626, mozilla bug 234789
3935             return g_strlcpy(p, os.str().c_str(), len);
3936         } else if (val->type == SP_FONT_SIZE_PERCENTAGE) {
3937             Inkscape::CSSOStringStream os;
3938             os << key << ":" << (SP_F8_16_TO_FLOAT(val->value) * 100.0) << "%;";
3939             return g_strlcpy(p, os.str().c_str(), len);
3940         }
3941     }
3942     return 0;
3946 /*
3947  * baseline-shift is relative to parent. The only time it should
3948  * not be written out is if it is zero (or not set).
3949  */
3950 static bool
3951 sp_baseline_shift_notzero(SPIBaselineShift const *const a )
3953     if( a->type == SP_BASELINE_SHIFT_LITERAL ) {
3954         if( a->literal == SP_CSS_BASELINE_SHIFT_BASELINE ) {
3955             return false;
3956         }
3957     } else {
3958         if( a->value == 0.0 ) {
3959             return false;
3960         }
3961     }
3962     return true;
3965 /**
3966  * Write SPIBaselineShift object into string.
3967  */
3968 static gint
3969 sp_style_write_ibaselineshift(gchar *p, gint const len, gchar const *key,
3970                               SPIBaselineShift const *const val, SPIBaselineShift const *const base,
3971                               guint const flags)
3973     if ((flags & SP_STYLE_FLAG_ALWAYS)
3974         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
3975         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set
3976             && (!base->set || sp_baseline_shift_notzero(val) )))
3977     {
3978         if (val->inherit) {
3979             return g_snprintf(p, len, "%s:inherit;", key);
3980         } else if (val->type == SP_BASELINE_SHIFT_LITERAL) {
3981             for (unsigned i = 0; enum_baseline_shift[i].key; i++) {
3982                 if (enum_baseline_shift[i].value == static_cast< gint > (val->literal) ) {
3983                     return g_snprintf(p, len, "%s:%s;", key, enum_baseline_shift[i].key);
3984                 }
3985             }
3986         } else if (val->type == SP_BASELINE_SHIFT_LENGTH) {
3987             if( val->unit == SP_CSS_UNIT_EM || val->unit == SP_CSS_UNIT_EX ) {
3988                 Inkscape::CSSOStringStream os;
3989                 os << key << ":" << val->value << (val->unit == SP_CSS_UNIT_EM ? "em;" : "ex;");
3990                 return g_strlcpy(p, os.str().c_str(), len);
3991             } else {
3992                 Inkscape::CSSOStringStream os;
3993                 os << key << ":" << val->computed << "px;";      // must specify px, see inkscape bug 1221626, mozilla bug 234789
3994                 return g_strlcpy(p, os.str().c_str(), len);
3995             }
3996         } else if (val->type == SP_BASELINE_SHIFT_PERCENTAGE) {
3997             Inkscape::CSSOStringStream os;
3998             os << key << ":" << (val->value * 100.0) << "%;";
3999             return g_strlcpy(p, os.str().c_str(), len);
4000         }
4001     }
4002     return 0;
4007 /**
4008  * Write SPIFilter object into string.
4009  */
4010 static gint
4011 sp_style_write_ifilter(gchar *p, gint const len, gchar const *key,
4012                          SPIFilter const *const val, SPIFilter const *const base,
4013                          guint const flags)
4015     (void)base; // TODO
4016     if ((flags & SP_STYLE_FLAG_ALWAYS)
4017         || ((flags & SP_STYLE_FLAG_IFSET) && val->set)
4018         || ((flags & SP_STYLE_FLAG_IFDIFF) && val->set))
4019     {
4020         if (val->inherit) {
4021             return g_snprintf(p, len, "%s:inherit;", key);
4022         } else if (val->href && val->href->getURI()) {
4023             return g_snprintf(p, len, "%s:url(%s);", key, val->href->getURI()->toString());
4024         }
4025     }
4028     return 0;
4031 SPIPaint::SPIPaint() :
4032     set(0),
4033     inherit(0),
4034     currentcolor(0),
4035     colorSet(0),
4036     noneSet(0),
4037     value()
4039     value.color.set( 0 );
4040     value.href = 0;
4043 void SPIPaint::clear()
4045     set = false;
4046     inherit = false;
4047     currentcolor = false;
4048     colorSet = false;
4049     noneSet = false;
4050     value.color.set( 0 );
4051     if ( value.href && value.href->getObject() )
4052     {
4053         value.href->detach();
4054     }
4058 /**
4059  * Clear filter object, and disconnect style from paintserver (if present).
4060  */
4061 static void
4062 sp_style_filter_clear(SPStyle *style)
4064     if (style->filter.href && style->filter.href->getObject())
4065         style->filter.href->detach();
4069 // FIXME: Everything below this line belongs in a different file - css-chemistry?
4071 void
4072 sp_style_set_property_url (SPObject *item, gchar const *property, SPObject *linked, bool recursive)
4074     Inkscape::XML::Node *repr = SP_OBJECT_REPR(item);
4076     if (repr == NULL) return;
4078     SPCSSAttr *css = sp_repr_css_attr_new();
4079     if (linked) {
4080         gchar *val = g_strdup_printf("url(#%s)", linked->getId());
4081         sp_repr_css_set_property(css, property, val);
4082         g_free(val);
4083     } else {
4084         sp_repr_css_unset_property(css, "filter");
4085     }
4087     if (recursive) {
4088         sp_repr_css_change_recursive(repr, css, "style");
4089     } else {
4090         sp_repr_css_change(repr, css, "style");
4091     }
4092     sp_repr_css_attr_unref(css);
4096 /**
4097  * Clear all style property attributes in object.
4098  */
4099 void
4100 sp_style_unset_property_attrs(SPObject *o)
4102     if (!o) return;
4104     SPStyle *style = SP_OBJECT_STYLE(o);
4105     if (!style) return;
4107     Inkscape::XML::Node *repr = SP_OBJECT_REPR(o);
4108     if (!repr) return;
4110     if (style->opacity.set) {
4111         repr->setAttribute("opacity", NULL);
4112     }
4113     if (style->color.set) {
4114         repr->setAttribute("color", NULL);
4115     }
4116     if (style->fill.set) {
4117         repr->setAttribute("fill", NULL);
4118     }
4119     if (style->fill_opacity.set) {
4120         repr->setAttribute("fill-opacity", NULL);
4121     }
4122     if (style->fill_rule.set) {
4123         repr->setAttribute("fill-rule", NULL);
4124     }
4125     if (style->stroke.set) {
4126         repr->setAttribute("stroke", NULL);
4127     }
4128     if (style->stroke_width.set) {
4129         repr->setAttribute("stroke-width", NULL);
4130     }
4131     if (style->stroke_linecap.set) {
4132         repr->setAttribute("stroke-linecap", NULL);
4133     }
4134     if (style->stroke_linejoin.set) {
4135         repr->setAttribute("stroke-linejoin", NULL);
4136     }
4137     if (style->marker[SP_MARKER_LOC].set) {
4138         repr->setAttribute("marker", NULL);
4139     }
4140     if (style->marker[SP_MARKER_LOC_START].set) {
4141         repr->setAttribute("marker-start", NULL);
4142     }
4143     if (style->marker[SP_MARKER_LOC_MID].set) {
4144         repr->setAttribute("marker-mid", NULL);
4145     }
4146     if (style->marker[SP_MARKER_LOC_END].set) {
4147         repr->setAttribute("marker-end", NULL);
4148     }
4149     if (style->stroke_opacity.set) {
4150         repr->setAttribute("stroke-opacity", NULL);
4151     }
4152     if (style->stroke_dasharray_set) {
4153         repr->setAttribute("stroke-dasharray", NULL);
4154     }
4155     if (style->stroke_dashoffset_set) {
4156         repr->setAttribute("stroke-dashoffset", NULL);
4157     }
4158     if (style->text_private && style->text->font_specification.set) {
4159         repr->setAttribute("-inkscape-font-specification", NULL);
4160     }
4161     if (style->text_private && style->text->font_family.set) {
4162         repr->setAttribute("font-family", NULL);
4163     }
4164     if (style->text_anchor.set) {
4165         repr->setAttribute("text-anchor", NULL);
4166     }
4167     if (style->writing_mode.set) {
4168         repr->setAttribute("writing_mode", NULL);
4169     }
4170     if (style->filter.set) {
4171         repr->setAttribute("filter", NULL);
4172     }
4173     if (style->enable_background.set) {
4174         repr->setAttribute("enable-background", NULL);
4175     }
4178 /**
4179  * \pre style != NULL.
4180  * \pre flags in {IFSET, ALWAYS}.
4181  */
4182 SPCSSAttr *
4183 sp_css_attr_from_style(SPStyle const *const style, guint const flags)
4185     g_return_val_if_fail(style != NULL, NULL);
4186     g_return_val_if_fail(((flags == SP_STYLE_FLAG_IFSET) ||
4187                           (flags == SP_STYLE_FLAG_ALWAYS)  ),
4188                          NULL);
4189     gchar *style_str = sp_style_write_string(style, flags);
4190     SPCSSAttr *css = sp_repr_css_attr_new();
4191     sp_repr_css_attr_add_from_string(css, style_str);
4192     g_free(style_str);
4193     return css;
4197 /**
4198  * \pre object != NULL
4199  * \pre flags in {IFSET, ALWAYS}.
4200  */
4201 SPCSSAttr *
4202 sp_css_attr_from_object(SPObject *object, guint const flags)
4204     g_return_val_if_fail(((flags == SP_STYLE_FLAG_IFSET) ||
4205                           (flags == SP_STYLE_FLAG_ALWAYS)  ),
4206                          NULL);
4207     SPStyle const *const style = SP_OBJECT_STYLE(object);
4208     if (style == NULL)
4209         return NULL;
4210     return sp_css_attr_from_style(style, flags);
4213 /**
4214  * Unset any text-related properties
4215  */
4216 SPCSSAttr *
4217 sp_css_attr_unset_text(SPCSSAttr *css)
4219     sp_repr_css_set_property(css, "font", NULL); // not implemented yet
4220     sp_repr_css_set_property(css, "-inkscape-font-specification", NULL);
4221     sp_repr_css_set_property(css, "font-size", NULL);
4222     sp_repr_css_set_property(css, "font-size-adjust", NULL); // not implemented yet
4223     sp_repr_css_set_property(css, "font-style", NULL);
4224     sp_repr_css_set_property(css, "font-variant", NULL);
4225     sp_repr_css_set_property(css, "font-weight", NULL);
4226     sp_repr_css_set_property(css, "font-stretch", NULL);
4227     sp_repr_css_set_property(css, "font-family", NULL);
4228     sp_repr_css_set_property(css, "text-indent", NULL);
4229     sp_repr_css_set_property(css, "text-align", NULL);
4230     sp_repr_css_set_property(css, "text-decoration", NULL);
4231     sp_repr_css_set_property(css, "line-height", NULL);
4232     sp_repr_css_set_property(css, "letter-spacing", NULL);
4233     sp_repr_css_set_property(css, "word-spacing", NULL);
4234     sp_repr_css_set_property(css, "text-transform", NULL);
4235     sp_repr_css_set_property(css, "direction", NULL);
4236     sp_repr_css_set_property(css, "block-progression", NULL);
4237     sp_repr_css_set_property(css, "writing-mode", NULL);
4238     sp_repr_css_set_property(css, "text-anchor", NULL);
4239     sp_repr_css_set_property(css, "kerning", NULL); // not implemented yet
4240     sp_repr_css_set_property(css, "dominant-baseline", NULL); // not implemented yet
4241     sp_repr_css_set_property(css, "alignment-baseline", NULL); // not implemented yet
4242     sp_repr_css_set_property(css, "baseline-shift", NULL);
4244     return css;
4247 bool
4248 is_url(char const *p)
4250     if (p == NULL)
4251         return false;
4252 /** \todo
4253  * FIXME: I'm not sure if this applies to SVG as well, but CSS2 says any URIs
4254  * in property values must start with 'url('.
4255  */
4256     return (g_ascii_strncasecmp(p, "url(", 4) == 0);
4259 /**
4260  * Unset any properties that contain URI values.
4261  *
4262  * Used for storing style that will be reused across documents when carrying
4263  * the referenced defs is impractical.
4264  */
4265 SPCSSAttr *
4266 sp_css_attr_unset_uris(SPCSSAttr *css)
4268 // All properties that may hold <uri> or <paint> according to SVG 1.1
4269     if (is_url(sp_repr_css_property(css, "clip-path", NULL))) sp_repr_css_set_property(css, "clip-path", NULL);
4270     if (is_url(sp_repr_css_property(css, "color-profile", NULL))) sp_repr_css_set_property(css, "color-profile", NULL);
4271     if (is_url(sp_repr_css_property(css, "cursor", NULL))) sp_repr_css_set_property(css, "cursor", NULL);
4272     if (is_url(sp_repr_css_property(css, "filter", NULL))) sp_repr_css_set_property(css, "filter", NULL);
4273     if (is_url(sp_repr_css_property(css, "marker", NULL))) sp_repr_css_set_property(css, "marker", NULL);
4274     if (is_url(sp_repr_css_property(css, "marker-start", NULL))) sp_repr_css_set_property(css, "marker-start", NULL);
4275     if (is_url(sp_repr_css_property(css, "marker-mid", NULL))) sp_repr_css_set_property(css, "marker-mid", NULL);
4276     if (is_url(sp_repr_css_property(css, "marker-end", NULL))) sp_repr_css_set_property(css, "marker-end", NULL);
4277     if (is_url(sp_repr_css_property(css, "mask", NULL))) sp_repr_css_set_property(css, "mask", NULL);
4278     if (is_url(sp_repr_css_property(css, "fill", NULL))) sp_repr_css_set_property(css, "fill", NULL);
4279     if (is_url(sp_repr_css_property(css, "stroke", NULL))) sp_repr_css_set_property(css, "stroke", NULL);
4281     return css;
4284 /**
4285  * Scale a single-value property.
4286  */
4287 void
4288 sp_css_attr_scale_property_single(SPCSSAttr *css, gchar const *property,
4289                                   double ex, bool only_with_units = false)
4291     gchar const *w = sp_repr_css_property(css, property, NULL);
4292     if (w) {
4293         gchar *units = NULL;
4294         double wd = g_ascii_strtod(w, &units) * ex;
4295         if (w == units) {// nothing converted, non-numeric value
4296             return;
4297         }
4298         if (only_with_units && (units == NULL || *units == '\0' || *units == '%')) {
4299             // only_with_units, but no units found, so do nothing.
4300             return;
4301         }
4302         Inkscape::CSSOStringStream os;
4303         os << wd << units; // reattach units
4304         sp_repr_css_set_property(css, property, os.str().c_str());
4305     }
4308 /**
4309  * Scale a list-of-values property.
4310  */
4311 void
4312 sp_css_attr_scale_property_list(SPCSSAttr *css, gchar const *property, double ex)
4314     gchar const *string = sp_repr_css_property(css, property, NULL);
4315     if (string) {
4316         Inkscape::CSSOStringStream os;
4317         gchar **a = g_strsplit(string, ",", 10000);
4318         bool first = true;
4319         for (gchar **i = a; i != NULL; i++) {
4320             gchar *w = *i;
4321             if (w == NULL)
4322                 break;
4323             gchar *units = NULL;
4324             double wd = g_ascii_strtod(w, &units) * ex;
4325             if (w == units) {// nothing converted, non-numeric value ("none" or "inherit"); do nothing
4326                 g_strfreev(a);
4327                 return;
4328             }
4329             if (!first) {
4330                 os << ",";
4331             }
4332             os << wd << units; // reattach units
4333             first = false;
4334         }
4335         sp_repr_css_set_property(css, property, os.str().c_str());
4336         g_strfreev(a);
4337     }
4340 /**
4341  * Scale any properties that may hold <length> by ex.
4342  */
4343 SPCSSAttr *
4344 sp_css_attr_scale(SPCSSAttr *css, double ex)
4346     sp_css_attr_scale_property_single(css, "baseline-shift", ex);
4347     sp_css_attr_scale_property_single(css, "stroke-width", ex);
4348     sp_css_attr_scale_property_list   (css, "stroke-dasharray", ex);
4349     sp_css_attr_scale_property_single(css, "stroke-dashoffset", ex);
4350     sp_css_attr_scale_property_single(css, "font-size", ex);
4351     sp_css_attr_scale_property_single(css, "kerning", ex);
4352     sp_css_attr_scale_property_single(css, "letter-spacing", ex);
4353     sp_css_attr_scale_property_single(css, "word-spacing", ex);
4354     sp_css_attr_scale_property_single(css, "line-height", ex, true);
4356     return css;
4360 /**
4361  * Remove quotes and escapes from a string. Returned value must be g_free'd.
4362  * Note: in CSS (in style= and in stylesheets), unquoting and unescaping is done
4363  * by libcroco, our CSS parser, though it adds a new pair of "" quotes for the strings
4364  * it parsed for us. So this function is only used to remove those quotes and for
4365  * presentation attributes, without any unescaping. (XML unescaping
4366  * (&amp; etc) is done by XML parser.)
4367  */
4368 gchar *
4369 attribute_unquote(gchar const *val)
4371     if (val) {
4372         if (*val == '\'' || *val == '"') {
4373             int l = strlen(val);
4374             if (l >= 2) {
4375                 if ( ( val[0] == '"' && val[l - 1] == '"' )  ||
4376                      ( val[0] == '\'' && val[l - 1] == '\'' )  ) {
4377                     return (g_strndup (val+1, l-2));
4378                 }
4379             }
4380         }
4381     }
4383     return (val? g_strdup (val) : NULL);
4386 /**
4387  * Quote and/or escape string for writing to CSS (style=). Returned value must be g_free'd.
4388  */
4389 gchar *
4390 css2_escape_quote(gchar const *val) {
4392     Glib::ustring t;
4393     bool quote = false;
4394     bool last_was_space = false;
4396     for (gchar const *i = val; *i; i++) {
4397         bool is_space = ( *i == ' ' );
4398         if (g_ascii_isalnum(*i) || *i=='-' || *i=='_') {
4399             // ASCII alphanumeric, - and _ don't require quotes
4400             t.push_back(*i);
4401         } else if ( is_space && !last_was_space ) {
4402             // non-consecutive spaces don't require quotes
4403             t.push_back(*i);
4404         } else if (*i=='\'') {
4405             // single quotes require escaping and quotes
4406             t.push_back('\\');
4407             t.push_back(*i);
4408             quote = true;
4409         } else {
4410             // everything else requires quotes
4411             t.push_back(*i);
4412             quote = true;
4413         }
4414         if (i == val && !g_ascii_isalpha(*i)) {
4415             // a non-ASCII/non-alpha initial character requires quotes
4416             quote = true;
4417         }
4418         last_was_space = is_space;
4419     }
4421     if (last_was_space) {
4422         // a trailing space requires quotes
4423         quote = true;
4424     }
4426     if (quote) {
4427         // we use single quotes so the result can be stored in an XML
4428         // attribute without incurring un-aesthetic additional quoting
4429         // (our XML emitter always uses double quotes)
4430         t.insert(t.begin(), '\'');
4431         t.push_back('\'');
4432     }
4434     return (t.empty() ? NULL : g_strdup (t.c_str()));
4437 /*
4438   Local Variables:
4439   mode:c++
4440   c-file-style:"stroustrup"
4441   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
4442   indent-tabs-mode:nil
4443   fill-column:99
4444   End:
4445 */
4446 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :