src/flood-context.cpp

   1 #define __SP_FLOOD_CONTEXT_C__
   2
   3 /** @file
   4  * @brief Bucket fill drawing context, works by bitmap filling an area on a rendered version
   5  * of the current display and then tracing the result using potrace.
   6  */
   7 /* Author:
   8  *   Lauris Kaplinski <lauris@kaplinski.com>
   9  *   bulia byak <buliabyak@users.sf.net>
  10  *   John Bintz <jcoswell@coswellproductions.org>
  11  *
  12  * Copyright (C) 2006      Johan Engelen <johan@shouraizou.nl>
  13  * Copyright (C) 2000-2005 authors
  14  * Copyright (C) 2000-2001 Ximian, Inc.
  15  *
  16  * Released under GNU GPL, read the file 'COPYING' for more information
  17  */
  18
  19 #ifdef HAVE_CONFIG_H
  20 #include "config.h"
  21 #endif
  22
  23 #include <gdk/gdkkeysyms.h>
  24 #include <queue>
  25 #include <deque>
  26
  27 #include "macros.h"
  28 #include "display/sp-canvas.h"
  29 #include "document.h"
  30 #include "sp-namedview.h"
  31 #include "sp-object.h"
  32 #include "sp-rect.h"
  33 #include "selection.h"
  34 #include "desktop-handles.h"
  35 #include "desktop.h"
  36 #include "desktop-style.h"
  37 #include "message-stack.h"
  38 #include "message-context.h"
  39 #include "pixmaps/cursor-paintbucket.xpm"
  40 #include "flood-context.h"
  41 #include "sp-metrics.h"
  42 #include <glibmm/i18n.h>
  43 #include "object-edit.h"
  44 #include "xml/repr.h"
  45 #include "xml/node-event-vector.h"
  46 #include "preferences.h"
  47 #include "context-fns.h"
  48 #include "rubberband.h"
  49 #include "shape-editor.h"
  50
  51 #include "display/nr-arena-item.h"
  52 #include "display/nr-arena.h"
  53 #include "display/nr-arena-image.h"
  54 #include "display/canvas-arena.h"
  55 #include "libnr/nr-pixops.h"
  56 #include "libnr/nr-matrix-translate-ops.h"
  57 #include "libnr/nr-scale-ops.h"
  58 #include "libnr/nr-scale-translate-ops.h"
  59 #include "libnr/nr-translate-matrix-ops.h"
  60 #include "libnr/nr-translate-scale-ops.h"
  61 #include "libnr/nr-matrix-ops.h"
  62 #include <2geom/pathvector.h>
  63 #include "sp-item.h"
  64 #include "sp-root.h"
  65 #include "sp-defs.h"
  66 #include "sp-path.h"
  67 #include "splivarot.h"
  68 #include "livarot/Path.h"
  69 #include "livarot/Shape.h"
  70 #include "svg/svg.h"
  71 #include "color.h"
  72
  73 #include "trace/trace.h"
  74 #include "trace/imagemap.h"
  75 #include "trace/potrace/inkscape-potrace.h"
  76
  77 static void sp_flood_context_class_init(SPFloodContextClass *klass);
  78 static void sp_flood_context_init(SPFloodContext *flood_context);
  79 static void sp_flood_context_dispose(GObject *object);
  80
  81 static void sp_flood_context_setup(SPEventContext *ec);
  82
  83 static gint sp_flood_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  84 static gint sp_flood_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  85
  86 static void sp_flood_finish(SPFloodContext *rc);
  87
  88 static SPEventContextClass *parent_class;
  89
  90
  91 GtkType sp_flood_context_get_type()
  92 {
  93     static GType type = 0;
  94     if (!type) {
  95         GTypeInfo info = {
  96             sizeof(SPFloodContextClass),
  97             NULL, NULL,
  98             (GClassInitFunc) sp_flood_context_class_init,
  99             NULL, NULL,
 100             sizeof(SPFloodContext),
 101             4,
 102             (GInstanceInitFunc) sp_flood_context_init,
 103             NULL,    /* value_table */
 104         };
 105         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPFloodContext", &info, (GTypeFlags) 0);
 106     }
 107     return type;
 108 }
 109
 110 static void sp_flood_context_class_init(SPFloodContextClass *klass)
 111 {
 112     GObjectClass *object_class = (GObjectClass *) klass;
 113     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
 114
 115     parent_class = (SPEventContextClass *) g_type_class_peek_parent(klass);
 116
 117     object_class->dispose = sp_flood_context_dispose;
 118
 119     event_context_class->setup = sp_flood_context_setup;
 120     event_context_class->root_handler  = sp_flood_context_root_handler;
 121     event_context_class->item_handler  = sp_flood_context_item_handler;
 122 }
 123
 124 static void sp_flood_context_init(SPFloodContext *flood_context)
 125 {
 126     SPEventContext *event_context = SP_EVENT_CONTEXT(flood_context);
 127
 128     event_context->cursor_shape = cursor_paintbucket_xpm;
 129     event_context->hot_x = 11;
 130     event_context->hot_y = 30;
 131     event_context->xp = 0;
 132     event_context->yp = 0;
 133     event_context->tolerance = 4;
 134     event_context->within_tolerance = false;
 135     event_context->item_to_select = NULL;
 136
 137     flood_context->item = NULL;
 138
 139     new (&flood_context->sel_changed_connection) sigc::connection();
 140 }
 141
 142 static void sp_flood_context_dispose(GObject *object)
 143 {
 144     SPFloodContext *rc = SP_FLOOD_CONTEXT(object);
 145     SPEventContext *ec = SP_EVENT_CONTEXT(object);
 146
 147     rc->sel_changed_connection.disconnect();
 148     rc->sel_changed_connection.~connection();
 149
 150     delete ec->shape_editor;
 151     ec->shape_editor = NULL;
 152
 153     /* fixme: This is necessary because we do not grab */
 154     if (rc->item) {
 155         sp_flood_finish(rc);
 156     }
 157
 158     if (rc->_message_context) {
 159         delete rc->_message_context;
 160     }
 161
 162     G_OBJECT_CLASS(parent_class)->dispose(object);
 163 }
 164
 165 /**
 166 \brief  Callback that processes the "changed" signal on the selection;
 167 destroys old and creates new knotholder
 168 */
 169 void sp_flood_context_selection_changed(Inkscape::Selection *selection, gpointer data)
 170 {
 171     SPFloodContext *rc = SP_FLOOD_CONTEXT(data);
 172     SPEventContext *ec = SP_EVENT_CONTEXT(rc);
 173
 174     ec->shape_editor->unset_item(SH_KNOTHOLDER);
 175     SPItem *item = selection->singleItem();
 176     ec->shape_editor->set_item(item, SH_KNOTHOLDER);
 177 }
 178
 179 static void sp_flood_context_setup(SPEventContext *ec)
 180 {
 181     SPFloodContext *rc = SP_FLOOD_CONTEXT(ec);
 182
 183     if (((SPEventContextClass *) parent_class)->setup) {
 184         ((SPEventContextClass *) parent_class)->setup(ec);
 185     }
 186
 187     ec->shape_editor = new ShapeEditor(ec->desktop);
 188
 189     SPItem *item = sp_desktop_selection(ec->desktop)->singleItem();
 190     if (item) {
 191         ec->shape_editor->set_item(item, SH_KNOTHOLDER);
 192     }
 193
 194     rc->sel_changed_connection.disconnect();
 195     rc->sel_changed_connection = sp_desktop_selection(ec->desktop)->connectChanged(
 196         sigc::bind(sigc::ptr_fun(&sp_flood_context_selection_changed), (gpointer)rc)
 197     );
 198
 199     rc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 200
 201     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 202     if (prefs->getBool("/tools/paintbucket/selcue")) {
 203         rc->enableSelectionCue();
 204     }
 205 }
 206
 207 /**
 208  * \brief Merge a pixel with the background color.
 209  * \param orig The pixel to merge with the background.
 210  * \param bg The background color.
 211  * \param base The pixel to merge the original and background into.
 212  */
 213 inline static void
 214 merge_pixel_with_background (unsigned char *orig, unsigned char *bg,
 215            unsigned char *base)
 216 {
 217     int precalc_bg_alpha = (255 * (255 - bg[3])) / 255;
 218
 219     for (int i = 0; i < 3; i++) {
 220         base[i] = precalc_bg_alpha + (bg[i] * bg[3]) / 255;
 221         base[i] = (base[i] * (255 - orig[3])) / 255 + (orig[i] * orig[3]) / 255;
 222     }
 223 }
 224
 225 /**
 226  * \brief Get the pointer to a pixel in a pixel buffer.
 227  * \param px The pixel buffer.
 228  * \param x The X coordinate.
 229  * \param y The Y coordinate.
 230  * \param width The width of the pixel buffer.
 231  */
 232 inline unsigned char * get_pixel(guchar *px, int x, int y, int width) {
 233     return px + (x + y * width) * 4;
 234 }
 235
 236 inline unsigned char * get_trace_pixel(guchar *trace_px, int x, int y, int width) {
 237     return trace_px + (x + y * width);
 238 }
 239
 240 /**
 241  * \brief Generate the list of trace channel selection entries.
 242  */
 243 GList * flood_channels_dropdown_items_list() {
 244     GList *glist = NULL;
 245
 246     glist = g_list_append (glist, _("Visible Colors"));
 247     glist = g_list_append (glist, _("Red"));
 248     glist = g_list_append (glist, _("Green"));
 249     glist = g_list_append (glist, _("Blue"));
 250     glist = g_list_append (glist, _("Hue"));
 251     glist = g_list_append (glist, _("Saturation"));
 252     glist = g_list_append (glist, _("Lightness"));
 253     glist = g_list_append (glist, _("Alpha"));
 254
 255     return glist;
 256 }
 257
 258 /**
 259  * \brief Generate the list of autogap selection entries.
 260  */
 261 GList * flood_autogap_dropdown_items_list() {
 262     GList *glist = NULL;
 263
 264     glist = g_list_append (glist, (void*) C_("Flood autogap", "None"));
 265     glist = g_list_append (glist, (void*) C_("Flood autogap", "Small"));
 266     glist = g_list_append (glist, (void*) C_("Flood autogap", "Medium"));
 267     glist = g_list_append (glist, (void*) C_("Flood autogap", "Large"));
 268
 269     return glist;
 270 }
 271
 272 /**
 273  * \brief Compare a pixel in a pixel buffer with another pixel to determine if a point should be included in the fill operation.
 274  * \param check The pixel in the pixel buffer to check.
 275  * \param orig The original selected pixel to use as the fill target color.
 276  * \param merged_orig_pixel The original pixel merged with the background.
 277  * \param dtc The desktop background color.
 278  * \param threshold The fill threshold.
 279  * \param method The fill method to use as defined in PaintBucketChannels.
 280  */
 281 static bool compare_pixels(unsigned char *check, unsigned char *orig, unsigned char *merged_orig_pixel, unsigned char *dtc, int threshold, PaintBucketChannels method) {
 282     int diff = 0;
 283     float hsl_check[3], hsl_orig[3];
 284
 285     if ((method == FLOOD_CHANNELS_H) ||
 286         (method == FLOOD_CHANNELS_S) ||
 287         (method == FLOOD_CHANNELS_L)) {
 288         sp_color_rgb_to_hsl_floatv(hsl_check, check[0] / 255.0, check[1] / 255.0, check[2] / 255.0);
 289         sp_color_rgb_to_hsl_floatv(hsl_orig, orig[0] / 255.0, orig[1] / 255.0, orig[2] / 255.0);
 290     }
 291
 292     switch (method) {
 293         case FLOOD_CHANNELS_ALPHA:
 294             return ((int)abs(check[3] - orig[3]) <= threshold);
 295         case FLOOD_CHANNELS_R:
 296             return ((int)abs(check[0] - orig[0]) <= threshold);
 297         case FLOOD_CHANNELS_G:
 298             return ((int)abs(check[1] - orig[1]) <= threshold);
 299         case FLOOD_CHANNELS_B:
 300             return ((int)abs(check[2] - orig[2]) <= threshold);
 301         case FLOOD_CHANNELS_RGB:
 302             unsigned char merged_check[3];
 303
 304             merge_pixel_with_background(check, dtc, merged_check);
 305
 306             for (int i = 0; i < 3; i++) {
 307               diff += (int)abs(merged_check[i] - merged_orig_pixel[i]);
 308             }
 309             return ((diff / 3) <= ((threshold * 3) / 4));
 310
 311         case FLOOD_CHANNELS_H:
 312             return ((int)(fabs(hsl_check[0] - hsl_orig[0]) * 100.0) <= threshold);
 313         case FLOOD_CHANNELS_S:
 314             return ((int)(fabs(hsl_check[1] - hsl_orig[1]) * 100.0) <= threshold);
 315         case FLOOD_CHANNELS_L:
 316             return ((int)(fabs(hsl_check[2] - hsl_orig[2]) * 100.0) <= threshold);
 317     }
 318
 319     return false;
 320 }
 321
 322 enum {
 323   PIXEL_CHECKED = 1,
 324   PIXEL_QUEUED  = 2,
 325   PIXEL_PAINTABLE = 4,
 326   PIXEL_NOT_PAINTABLE = 8,
 327   PIXEL_COLORED = 16
 328 };
 329
 330 static inline bool is_pixel_checked(unsigned char *t) { return (*t & PIXEL_CHECKED) == PIXEL_CHECKED; }
 331 static inline bool is_pixel_queued(unsigned char *t) { return (*t & PIXEL_QUEUED) == PIXEL_QUEUED; }
 332 static inline bool is_pixel_paintability_checked(unsigned char *t) {
 333   return !((*t & PIXEL_PAINTABLE) == 0) && ((*t & PIXEL_NOT_PAINTABLE) == 0);
 334 }
 335 static inline bool is_pixel_paintable(unsigned char *t) { return (*t & PIXEL_PAINTABLE) == PIXEL_PAINTABLE; }
 336 static inline bool is_pixel_colored(unsigned char *t) { return (*t & PIXEL_COLORED) == PIXEL_COLORED; }
 337
 338 static inline void mark_pixel_checked(unsigned char *t) { *t |= PIXEL_CHECKED; }
 339 static inline void mark_pixel_unchecked(unsigned char *t) { *t ^= PIXEL_CHECKED; }
 340 static inline void mark_pixel_queued(unsigned char *t) { *t |= PIXEL_QUEUED; }
 341 static inline void mark_pixel_paintable(unsigned char *t) { *t |= PIXEL_PAINTABLE; *t ^= PIXEL_NOT_PAINTABLE; }
 342 static inline void mark_pixel_not_paintable(unsigned char *t) { *t |= PIXEL_NOT_PAINTABLE; *t ^= PIXEL_PAINTABLE; }
 343 static inline void mark_pixel_colored(unsigned char *t) { *t |= PIXEL_COLORED; }
 344
 345 static inline void clear_pixel_paintability(unsigned char *t) { *t ^= PIXEL_PAINTABLE; *t ^= PIXEL_NOT_PAINTABLE; }
 346
 347 struct bitmap_coords_info {
 348     bool is_left;
 349     unsigned int x;
 350     unsigned int y;
 351     int y_limit;
 352     unsigned int width;
 353     unsigned int height;
 354     unsigned int threshold;
 355     unsigned int radius;
 356     PaintBucketChannels method;
 357     unsigned char *dtc;
 358     unsigned char *merged_orig_pixel;
 359     Geom::Rect bbox;
 360     Geom::Rect screen;
 361     unsigned int max_queue_size;
 362     unsigned int current_step;
 363 };
 364
 365 /**
 366  * \brief Check if a pixel can be included in the fill.
 367  * \param px The rendered pixel buffer to check.
 368  * \param trace_t The pixel in the trace pixel buffer to check or mark.
 369  * \param x The X coordinate.
 370  * \param y The y coordinate.
 371  * \param orig_color The original selected pixel to use as the fill target color.
 372  * \param bci The bitmap_coords_info structure.
 373  */
 374 inline static bool check_if_pixel_is_paintable(guchar *px, unsigned char *trace_t, int x, int y, unsigned char *orig_color, bitmap_coords_info bci) {
 375     if (is_pixel_paintability_checked(trace_t)) {
 376         return is_pixel_paintable(trace_t);
 377     } else {
 378         unsigned char *t = get_pixel(px, x, y, bci.width);
 379         if (compare_pixels(t, orig_color, bci.merged_orig_pixel, bci.dtc, bci.threshold, bci.method)) {
 380             mark_pixel_paintable(trace_t);
 381             return true;
 382         } else {
 383             mark_pixel_not_paintable(trace_t);
 384             return false;
 385         }
 386     }
 387 }
 388
 389 /**
 390  * \brief Perform the bitmap-to-vector tracing and place the traced path onto the document.
 391  * \param px The trace pixel buffer to trace to SVG.
 392  * \param desktop The desktop on which to place the final SVG path.
 393  * \param transform The transform to apply to the final SVG path.
 394  * \param union_with_selection If true, merge the final SVG path with the current selection.
 395  */
 396 static void do_trace(bitmap_coords_info bci, guchar *trace_px, SPDesktop *desktop, Geom::Matrix transform, unsigned int min_x, unsigned int max_x, unsigned int min_y, unsigned int max_y, bool union_with_selection) {
 397     SPDocument *document = sp_desktop_document(desktop);
 398
 399     unsigned char *trace_t;
 400
 401     GrayMap *gray_map = GrayMapCreate((max_x - min_x + 1), (max_y - min_y + 1));
 402     unsigned int gray_map_y = 0;
 403     for (unsigned int y = min_y; y <= max_y; y++) {
 404         unsigned long *gray_map_t = gray_map->rows[gray_map_y];
 405
 406         trace_t = get_trace_pixel(trace_px, min_x, y, bci.width);
 407         for (unsigned int x = min_x; x <= max_x; x++) {
 408             *gray_map_t = is_pixel_colored(trace_t) ? GRAYMAP_BLACK : GRAYMAP_WHITE;
 409             gray_map_t++;
 410             trace_t++;
 411         }
 412         gray_map_y++;
 413     }
 414
 415     Inkscape::Trace::Potrace::PotraceTracingEngine pte;
 416     pte.keepGoing = 1;
 417     std::vector<Inkscape::Trace::TracingEngineResult> results = pte.traceGrayMap(gray_map);
 418     gray_map->destroy(gray_map);
 419
 420     Inkscape::XML::Node *layer_repr = SP_GROUP(desktop->currentLayer())->repr;
 421     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
 422
 423     long totalNodeCount = 0L;
 424
 425     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 426     double offset = prefs->getDouble("/tools/paintbucket/offset", 0.0);
 427
 428     for (unsigned int i=0 ; i<results.size() ; i++) {
 429         Inkscape::Trace::TracingEngineResult result = results[i];
 430         totalNodeCount += result.getNodeCount();
 431
 432         Inkscape::XML::Node *pathRepr = xml_doc->createElement("svg:path");
 433         /* Set style */
 434         sp_desktop_apply_style_tool (desktop, pathRepr, "/tools/paintbucket", false);
 435
 436         Geom::PathVector pathv = sp_svg_read_pathv(result.getPathData().c_str());
 437         Path *path = new Path;
 438         path->LoadPathVector(pathv);
 439
 440         if (offset != 0) {
 441
 442             Shape *path_shape = new Shape();
 443
 444             path->ConvertWithBackData(0.03);
 445             path->Fill(path_shape, 0);
 446             delete path;
 447
 448             Shape *expanded_path_shape = new Shape();
 449
 450             expanded_path_shape->ConvertToShape(path_shape, fill_nonZero);
 451             path_shape->MakeOffset(expanded_path_shape, offset * desktop->current_zoom(), join_round, 4);
 452             expanded_path_shape->ConvertToShape(path_shape, fill_positive);
 453
 454             Path *expanded_path = new Path();
 455
 456             expanded_path->Reset();
 457             expanded_path_shape->ConvertToForme(expanded_path);
 458             expanded_path->ConvertEvenLines(1.0);
 459             expanded_path->Simplify(1.0);
 460
 461             delete path_shape;
 462             delete expanded_path_shape;
 463
 464             gchar *str = expanded_path->svg_dump_path();
 465             if (str && *str) {
 466                 pathRepr->setAttribute("d", str);
 467                 g_free(str);
 468             } else {
 469                 desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE, _("<b>Too much inset</b>, the result is empty."));
 470                 Inkscape::GC::release(pathRepr);
 471                 g_free(str);
 472                 return;
 473             }
 474
 475             delete expanded_path;
 476
 477         } else {
 478             gchar *str = path->svg_dump_path();
 479             delete path;
 480             pathRepr->setAttribute("d", str);
 481             g_free(str);
 482         }
 483
 484         layer_repr->addChild(pathRepr, NULL);
 485
 486         SPObject *reprobj = document->getObjectByRepr(pathRepr);
 487         if (reprobj) {
 488             sp_item_write_transform(SP_ITEM(reprobj), pathRepr, transform, NULL);
 489
 490             // premultiply the item transform by the accumulated parent transform in the paste layer
 491             Geom::Matrix local (sp_item_i2doc_affine(SP_GROUP(desktop->currentLayer())));
 492             if (!local.isIdentity()) {
 493                 gchar const *t_str = pathRepr->attribute("transform");
 494                 Geom::Matrix item_t (Geom::identity());
 495                 if (t_str)
 496                     sp_svg_transform_read(t_str, &item_t);
 497                 item_t *= local.inverse();
 498                 // (we're dealing with unattached repr, so we write to its attr instead of using sp_item_set_transform)
 499                 gchar *affinestr=sp_svg_transform_write(item_t);
 500                 pathRepr->setAttribute("transform", affinestr);
 501                 g_free(affinestr);
 502             }
 503
 504             Inkscape::Selection *selection = sp_desktop_selection(desktop);
 505
 506             pathRepr->setPosition(-1);
 507
 508             if (union_with_selection) {
 509                 desktop->messageStack()->flashF(Inkscape::WARNING_MESSAGE, ngettext("Area filled, path with <b>%d</b> node created and unioned with selection.","Area filled, path with <b>%d</b> nodes created and unioned with selection.",sp_nodes_in_path(SP_PATH(reprobj))), sp_nodes_in_path(SP_PATH(reprobj)));
 510                 selection->add(reprobj);
 511                 sp_selected_path_union_skip_undo(desktop);
 512             } else {
 513                 desktop->messageStack()->flashF(Inkscape::WARNING_MESSAGE, ngettext("Area filled, path with <b>%d</b> node created.","Area filled, path with <b>%d</b> nodes created.",sp_nodes_in_path(SP_PATH(reprobj))), sp_nodes_in_path(SP_PATH(reprobj)));
 514                 selection->set(reprobj);
 515             }
 516
 517         }
 518
 519         Inkscape::GC::release(pathRepr);
 520
 521     }
 522 }
 523
 524 /**
 525  * \brief The possible return states of perform_bitmap_scanline_check()
 526  */
 527 enum ScanlineCheckResult {
 528     SCANLINE_CHECK_OK,
 529     SCANLINE_CHECK_ABORTED,
 530     SCANLINE_CHECK_BOUNDARY
 531 };
 532
 533 /**
 534  * \brief Determine if the provided coordinates are within the pixel buffer limits.
 535  * \param x The X coordinate.
 536  * \param y The Y coordinate.
 537  * \param bci The bitmap_coords_info structure.
 538  */
 539 inline static bool coords_in_range(unsigned int x, unsigned int y, bitmap_coords_info bci) {
 540     return (x < bci.width) &&
 541            (y < bci.height);
 542 }
 543
 544 #define PAINT_DIRECTION_LEFT 1
 545 #define PAINT_DIRECTION_RIGHT 2
 546 #define PAINT_DIRECTION_UP 4
 547 #define PAINT_DIRECTION_DOWN 8
 548 #define PAINT_DIRECTION_ALL 15
 549
 550 /**
 551  * \brief Paint a pixel or a square (if autogap is enabled) on the trace pixel buffer
 552  * \param px The rendered pixel buffer to check.
 553  * \param trace_px The trace pixel buffer.
 554  * \param orig_color The original selected pixel to use as the fill target color.
 555  * \param bci The bitmap_coords_info structure.
 556  * \param original_point_trace_t The original pixel in the trace pixel buffer to check.
 557  */
 558 inline static unsigned int paint_pixel(guchar *px, guchar *trace_px, unsigned char *orig_color, bitmap_coords_info bci, unsigned char *original_point_trace_t) {
 559     if (bci.radius == 0) {
 560         mark_pixel_colored(original_point_trace_t);
 561         return PAINT_DIRECTION_ALL;
 562     } else {
 563         unsigned char *trace_t;
 564
 565         bool can_paint_up = true;
 566         bool can_paint_down = true;
 567         bool can_paint_left = true;
 568         bool can_paint_right = true;
 569
 570         for (unsigned int ty = bci.y - bci.radius; ty <= bci.y + bci.radius; ty++) {
 571             for (unsigned int tx = bci.x - bci.radius; tx <= bci.x + bci.radius; tx++) {
 572                 if (coords_in_range(tx, ty, bci)) {
 573                     trace_t = get_trace_pixel(trace_px, tx, ty, bci.width);
 574                     if (!is_pixel_colored(trace_t)) {
 575                         if (check_if_pixel_is_paintable(px, trace_t, tx, ty, orig_color, bci)) {
 576                             mark_pixel_colored(trace_t);
 577                         } else {
 578                             if (tx < bci.x) { can_paint_left = false; }
 579                             if (tx > bci.x) { can_paint_right = false; }
 580                             if (ty < bci.y) { can_paint_up = false; }
 581                             if (ty > bci.y) { can_paint_down = false; }
 582                         }
 583                     }
 584                 }
 585             }
 586         }
 587
 588         unsigned int paint_directions = 0;
 589         if (can_paint_left) { paint_directions += PAINT_DIRECTION_LEFT; }
 590         if (can_paint_right) { paint_directions += PAINT_DIRECTION_RIGHT; }
 591         if (can_paint_up) { paint_directions += PAINT_DIRECTION_UP; }
 592         if (can_paint_down) { paint_directions += PAINT_DIRECTION_DOWN; }
 593
 594         return paint_directions;
 595     }
 596 }
 597
 598 /**
 599  * \brief Push a point to be checked onto the bottom of the rendered pixel buffer check queue.
 600  * \param fill_queue The fill queue to add the point to.
 601  * \param max_queue_size The maximum size of the fill queue.
 602  * \param trace_t The trace pixel buffer pixel.
 603  * \param x The X coordinate.
 604  * \param y The Y coordinate.
 605  */
 606 static void push_point_onto_queue(std::deque<Geom::Point> *fill_queue, unsigned int max_queue_size, unsigned char *trace_t, unsigned int x, unsigned int y) {
 607     if (!is_pixel_queued(trace_t)) {
 608         if ((fill_queue->size() < max_queue_size)) {
 609             fill_queue->push_back(Geom::Point(x, y));
 610             mark_pixel_queued(trace_t);
 611         }
 612     }
 613 }
 614
 615 /**
 616  * \brief Shift a point to be checked onto the top of the rendered pixel buffer check queue.
 617  * \param fill_queue The fill queue to add the point to.
 618  * \param max_queue_size The maximum size of the fill queue.
 619  * \param trace_t The trace pixel buffer pixel.
 620  * \param x The X coordinate.
 621  * \param y The Y coordinate.
 622  */
 623 static void shift_point_onto_queue(std::deque<Geom::Point> *fill_queue, unsigned int max_queue_size, unsigned char *trace_t, unsigned int x, unsigned int y) {
 624     if (!is_pixel_queued(trace_t)) {
 625         if ((fill_queue->size() < max_queue_size)) {
 626             fill_queue->push_front(Geom::Point(x, y));
 627             mark_pixel_queued(trace_t);
 628         }
 629     }
 630 }
 631
 632 /**
 633  * \brief Scan a row in the rendered pixel buffer and add points to the fill queue as necessary.
 634  * \param fill_queue The fill queue to add the point to.
 635  * \param px The rendered pixel buffer.
 636  * \param trace_px The trace pixel buffer.
 637  * \param orig_color The original selected pixel to use as the fill target color.
 638  * \param bci The bitmap_coords_info structure.
 639  */
 640 static ScanlineCheckResult perform_bitmap_scanline_check(std::deque<Geom::Point> *fill_queue, guchar *px, guchar *trace_px, unsigned char *orig_color, bitmap_coords_info bci, unsigned int *min_x, unsigned int *max_x) {
 641     bool aborted = false;
 642     bool reached_screen_boundary = false;
 643     bool ok;
 644
 645     bool keep_tracing;
 646     bool initial_paint = true;
 647
 648     unsigned char *current_trace_t = get_trace_pixel(trace_px, bci.x, bci.y, bci.width);
 649     unsigned int paint_directions;
 650
 651     bool currently_painting_top = false;
 652     bool currently_painting_bottom = false;
 653
 654     unsigned int top_ty = bci.y - 1;
 655     unsigned int bottom_ty = bci.y + 1;
 656
 657     bool can_paint_top = (top_ty > 0);
 658     bool can_paint_bottom = (bottom_ty < bci.height);
 659
 660     Geom::Point t = fill_queue->front();
 661
 662     do {
 663         ok = false;
 664         if (bci.is_left) {
 665             keep_tracing = (bci.x != 0);
 666         } else {
 667             keep_tracing = (bci.x < bci.width);
 668         }
 669
 670         *min_x = MIN(*min_x, bci.x);
 671         *max_x = MAX(*max_x, bci.x);
 672
 673         if (keep_tracing) {
 674             if (check_if_pixel_is_paintable(px, current_trace_t, bci.x, bci.y, orig_color, bci)) {
 675                 paint_directions = paint_pixel(px, trace_px, orig_color, bci, current_trace_t);
 676                 if (bci.radius == 0) {
 677                     mark_pixel_checked(current_trace_t);
 678                     if ((t[Geom::X] == bci.x) && (t[Geom::Y] == bci.y)) {
 679                         fill_queue->pop_front(); t = fill_queue->front();
 680                     }
 681                 }
 682
 683                 if (can_paint_top) {
 684                     if (paint_directions & PAINT_DIRECTION_UP) {
 685                         unsigned char *trace_t = current_trace_t - bci.width;
 686                         if (!is_pixel_queued(trace_t)) {
 687                             bool ok_to_paint = check_if_pixel_is_paintable(px, trace_t, bci.x, top_ty, orig_color, bci);
 688
 689                             if (initial_paint) { currently_painting_top = !ok_to_paint; }
 690
 691                             if (ok_to_paint && (!currently_painting_top)) {
 692                                 currently_painting_top = true;
 693                                 push_point_onto_queue(fill_queue, bci.max_queue_size, trace_t, bci.x, top_ty);
 694                             }
 695                             if ((!ok_to_paint) && currently_painting_top) {
 696                                 currently_painting_top = false;
 697                             }
 698                         }
 699                     }
 700                 }
 701
 702                 if (can_paint_bottom) {
 703                     if (paint_directions & PAINT_DIRECTION_DOWN) {
 704                         unsigned char *trace_t = current_trace_t + bci.width;
 705                         if (!is_pixel_queued(trace_t)) {
 706                             bool ok_to_paint = check_if_pixel_is_paintable(px, trace_t, bci.x, bottom_ty, orig_color, bci);
 707
 708                             if (initial_paint) { currently_painting_bottom = !ok_to_paint; }
 709
 710                             if (ok_to_paint && (!currently_painting_bottom)) {
 711                                 currently_painting_bottom = true;
 712                                 push_point_onto_queue(fill_queue, bci.max_queue_size, trace_t, bci.x, bottom_ty);
 713                             }
 714                             if ((!ok_to_paint) && currently_painting_bottom) {
 715                                 currently_painting_bottom = false;
 716                             }
 717                         }
 718                     }
 719                 }
 720
 721                 if (bci.is_left) {
 722                     if (paint_directions & PAINT_DIRECTION_LEFT) {
 723                         bci.x--; current_trace_t--;
 724                         ok = true;
 725                     }
 726                 } else {
 727                     if (paint_directions & PAINT_DIRECTION_RIGHT) {
 728                         bci.x++; current_trace_t++;
 729                         ok = true;
 730                     }
 731                 }
 732
 733                 initial_paint = false;
 734             }
 735         } else {
 736             if (bci.bbox.min()[Geom::X] > bci.screen.min()[Geom::X]) {
 737                 aborted = true; break;
 738             } else {
 739                 reached_screen_boundary = true;
 740             }
 741         }
 742     } while (ok);
 743
 744     if (aborted) { return SCANLINE_CHECK_ABORTED; }
 745     if (reached_screen_boundary) { return SCANLINE_CHECK_BOUNDARY; }
 746     return SCANLINE_CHECK_OK;
 747 }
 748
 749 /**
 750  * \brief Sort the rendered pixel buffer check queue vertically.
 751  */
 752 static bool sort_fill_queue_vertical(Geom::Point a, Geom::Point b) {
 753     return a[Geom::Y] > b[Geom::Y];
 754 }
 755
 756 /**
 757  * \brief Sort the rendered pixel buffer check queue horizontally.
 758  */
 759 static bool sort_fill_queue_horizontal(Geom::Point a, Geom::Point b) {
 760     return a[Geom::X] > b[Geom::X];
 761 }
 762
 763 /**
 764  * \brief Perform a flood fill operation.
 765  * \param event_context The event context for this tool.
 766  * \param event The details of this event.
 767  * \param union_with_selection If true, union the new fill with the current selection.
 768  * \param is_point_fill If false, use the Rubberband "touch selection" to get the initial points for the fill.
 769  * \param is_touch_fill If true, use only the initial contact point in the Rubberband "touch selection" as the fill target color.
 770  */
 771 static void sp_flood_do_flood_fill(SPEventContext *event_context, GdkEvent *event, bool union_with_selection, bool is_point_fill, bool is_touch_fill) {
 772     SPDesktop *desktop = event_context->desktop;
 773     SPDocument *document = sp_desktop_document(desktop);
 774
 775     /* Create new arena */
 776     NRArena *arena = NRArena::create();
 777     unsigned dkey = sp_item_display_key_new(1);
 778
 779     sp_document_ensure_up_to_date (document);
 780
 781     SPItem *document_root = SP_ITEM(SP_DOCUMENT_ROOT(document));
 782     Geom::OptRect bbox = document_root->getBounds(Geom::identity());
 783
 784     if (!bbox) {
 785         desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE, _("<b>Area is not bounded</b>, cannot fill."));
 786         return;
 787     }
 788
 789     double zoom_scale = desktop->current_zoom();
 790
 791     // Render 160% of the physical display to the render pixel buffer, so that available
 792     // fill areas off the screen can be included in the fill.
 793     double padding = 1.6;
 794
 795     Geom::Rect screen = desktop->get_display_area();
 796
 797     unsigned int width = (int)ceil(screen.width() * zoom_scale * padding);
 798     unsigned int height = (int)ceil(screen.height() * zoom_scale * padding);
 799
 800     Geom::Point origin(screen.min()[Geom::X],
 801                        sp_document_height(document) - screen.height() - screen.min()[Geom::Y]);
 802
 803     origin[Geom::X] = origin[Geom::X] + (screen.width() * ((1 - padding) / 2));
 804     origin[Geom::Y] = origin[Geom::Y] + (screen.height() * ((1 - padding) / 2));
 805
 806     Geom::Scale scale(zoom_scale, zoom_scale);
 807     Geom::Matrix affine = scale * Geom::Translate(-origin * scale);
 808
 809     /* Create ArenaItems and set transform */
 810     NRArenaItem *root = sp_item_invoke_show(SP_ITEM(sp_document_root(document)), arena, dkey, SP_ITEM_SHOW_DISPLAY);
 811     nr_arena_item_set_transform(NR_ARENA_ITEM(root), affine);
 812
 813     NRGC gc(NULL);
 814     gc.transform.setIdentity();
 815
 816     NRRectL final_bbox;
 817     final_bbox.x0 = 0;
 818     final_bbox.y0 = 0; //row;
 819     final_bbox.x1 = width;
 820     final_bbox.y1 = height; //row + num_rows;
 821
 822     nr_arena_item_invoke_update(root, &final_bbox, &gc, NR_ARENA_ITEM_STATE_ALL, NR_ARENA_ITEM_STATE_NONE);
 823
 824     guchar *px = g_new(guchar, 4 * width * height);
 825
 826     NRPixBlock B;
 827     nr_pixblock_setup_extern( &B, NR_PIXBLOCK_MODE_R8G8B8A8N,
 828                               final_bbox.x0, final_bbox.y0, final_bbox.x1, final_bbox.y1,
 829                               px, 4 * width, FALSE, FALSE );
 830
 831     SPNamedView *nv = sp_desktop_namedview(desktop);
 832     unsigned long bgcolor = nv->pagecolor;
 833
 834     unsigned char dtc[4];
 835     dtc[0] = NR_RGBA32_R(bgcolor);
 836     dtc[1] = NR_RGBA32_G(bgcolor);
 837     dtc[2] = NR_RGBA32_B(bgcolor);
 838     dtc[3] = NR_RGBA32_A(bgcolor);
 839
 840     for (unsigned int fy = 0; fy < height; fy++) {
 841         guchar *p = NR_PIXBLOCK_PX(&B) + fy * B.rs;
 842         for (unsigned int fx = 0; fx < width; fx++) {
 843             for (int i = 0; i < 4; i++) {
 844                 *p++ = dtc[i];
 845             }
 846         }
 847     }
 848
 849     nr_arena_item_invoke_render(NULL, root, &final_bbox, &B, NR_ARENA_ITEM_RENDER_NO_CACHE );
 850     nr_pixblock_release(&B);
 851
 852     // Hide items
 853     sp_item_invoke_hide(SP_ITEM(sp_document_root(document)), dkey);
 854
 855     nr_object_unref((NRObject *) arena);
 856
 857     guchar *trace_px = g_new(guchar, width * height);
 858     memset(trace_px, 0x00, width * height);
 859
 860     std::deque<Geom::Point> fill_queue;
 861     std::queue<Geom::Point> color_queue;
 862
 863     std::vector<Geom::Point> fill_points;
 864
 865     bool aborted = false;
 866     int y_limit = height - 1;
 867
 868     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 869     PaintBucketChannels method = (PaintBucketChannels) prefs->getInt("/tools/paintbucket/channels", 0);
 870     int threshold = prefs->getIntLimited("/tools/paintbucket/threshold", 1, 0, 100);
 871
 872     switch(method) {
 873         case FLOOD_CHANNELS_ALPHA:
 874         case FLOOD_CHANNELS_RGB:
 875         case FLOOD_CHANNELS_R:
 876         case FLOOD_CHANNELS_G:
 877         case FLOOD_CHANNELS_B:
 878             threshold = (255 * threshold) / 100;
 879             break;
 880         case FLOOD_CHANNELS_H:
 881         case FLOOD_CHANNELS_S:
 882         case FLOOD_CHANNELS_L:
 883             break;
 884     }
 885
 886     bitmap_coords_info bci;
 887
 888     bci.y_limit = y_limit;
 889     bci.width = width;
 890     bci.height = height;
 891     bci.threshold = threshold;
 892     bci.method = method;
 893     bci.bbox = *bbox;
 894     bci.screen = screen;
 895     bci.dtc = dtc;
 896     bci.radius = prefs->getIntLimited("/tools/paintbucket/autogap", 0, 0, 3);
 897     bci.max_queue_size = (width * height) / 4;
 898     bci.current_step = 0;
 899
 900     if (is_point_fill) {
 901         fill_points.push_back(Geom::Point(event->button.x, event->button.y));
 902     } else {
 903         Inkscape::Rubberband *r = Inkscape::Rubberband::get(desktop);
 904         fill_points = r->getPoints();
 905     }
 906
 907     for (unsigned int i = 0; i < fill_points.size(); i++) {
 908         Geom::Point pw = Geom::Point(fill_points[i][Geom::X] / zoom_scale, sp_document_height(document) + (fill_points[i][Geom::Y] / zoom_scale)) * affine;
 909
 910         pw[Geom::X] = (int)MIN(width - 1, MAX(0, pw[Geom::X]));
 911         pw[Geom::Y] = (int)MIN(height - 1, MAX(0, pw[Geom::Y]));
 912
 913         if (is_touch_fill) {
 914             if (i == 0) {
 915                 color_queue.push(pw);
 916             } else {
 917                 unsigned char *trace_t = get_trace_pixel(trace_px, (int)pw[Geom::X], (int)pw[Geom::Y], width);
 918                 push_point_onto_queue(&fill_queue, bci.max_queue_size, trace_t, (int)pw[Geom::X], (int)pw[Geom::Y]);
 919             }
 920         } else {
 921             color_queue.push(pw);
 922         }
 923     }
 924
 925     bool reached_screen_boundary = false;
 926
 927     bool first_run = true;
 928
 929     unsigned long sort_size_threshold = 5;
 930
 931     unsigned int min_y = height;
 932     unsigned int max_y = 0;
 933     unsigned int min_x = width;
 934     unsigned int max_x = 0;
 935
 936     while (!color_queue.empty() && !aborted) {
 937         Geom::Point color_point = color_queue.front();
 938         color_queue.pop();
 939
 940         int cx = (int)color_point[Geom::X];
 941         int cy = (int)color_point[Geom::Y];
 942
 943         unsigned char *orig_px = get_pixel(px, cx, cy, width);
 944         unsigned char orig_color[4];
 945         for (int i = 0; i < 4; i++) { orig_color[i] = orig_px[i]; }
 946
 947         unsigned char merged_orig[3];
 948
 949         merge_pixel_with_background(orig_color, dtc, merged_orig);
 950
 951         bci.merged_orig_pixel = merged_orig;
 952
 953         unsigned char *trace_t = get_trace_pixel(trace_px, cx, cy, width);
 954         if (!is_pixel_checked(trace_t) && !is_pixel_colored(trace_t)) {
 955             if (check_if_pixel_is_paintable(px, trace_px, cx, cy, orig_color, bci)) {
 956                 shift_point_onto_queue(&fill_queue, bci.max_queue_size, trace_t, cx, cy);
 957
 958                 if (!first_run) {
 959                     for (unsigned int y = 0; y < height; y++) {
 960                         trace_t = get_trace_pixel(trace_px, 0, y, width);
 961                         for (unsigned int x = 0; x < width; x++) {
 962                             clear_pixel_paintability(trace_t);
 963                             trace_t++;
 964                         }
 965                     }
 966                 }
 967                 first_run = false;
 968             }
 969         }
 970
 971         unsigned long old_fill_queue_size = fill_queue.size();
 972
 973         while (!fill_queue.empty() && !aborted) {
 974             Geom::Point cp = fill_queue.front();
 975
 976             if (bci.radius == 0) {
 977                 unsigned long new_fill_queue_size = fill_queue.size();
 978
 979                 /*
 980                  * To reduce the number of points in the fill queue, periodically
 981                  * resort all of the points in the queue so that scanline checks
 982                  * can complete more quickly.  A point cannot be checked twice
 983                  * in a normal scanline checks, so forcing scanline checks to start
 984                  * from one corner of the rendered area as often as possible
 985                  * will reduce the number of points that need to be checked and queued.
 986                  */
 987                 if (new_fill_queue_size > sort_size_threshold) {
 988                     if (new_fill_queue_size > old_fill_queue_size) {
 989                         std::sort(fill_queue.begin(), fill_queue.end(), sort_fill_queue_vertical);
 990
 991                         std::deque<Geom::Point>::iterator start_sort = fill_queue.begin();
 992                         std::deque<Geom::Point>::iterator end_sort = fill_queue.begin();
 993                         unsigned int sort_y = (unsigned int)cp[Geom::Y];
 994                         unsigned int current_y = sort_y;
 995
 996                         for (std::deque<Geom::Point>::iterator i = fill_queue.begin(); i != fill_queue.end(); i++) {
 997                             Geom::Point current = *i;
 998                             current_y = (unsigned int)current[Geom::Y];
 999                             if (current_y != sort_y) {
1000                                 if (start_sort != end_sort) {
1001                                     std::sort(start_sort, end_sort, sort_fill_queue_horizontal);
1002                                 }
1003                                 sort_y = current_y;
1004                                 start_sort = i;
1005                             }
1006                             end_sort = i;
1007                         }
1008                         if (start_sort != end_sort) {
1009                             std::sort(start_sort, end_sort, sort_fill_queue_horizontal);
1010                         }
1011
1012                         cp = fill_queue.front();
1013                     }
1014                 }
1015
1016                 old_fill_queue_size = new_fill_queue_size;
1017             }
1018
1019             fill_queue.pop_front();
1020
1021             int x = (int)cp[Geom::X];
1022             int y = (int)cp[Geom::Y];
1023
1024             min_y = MIN((unsigned int)y, min_y);
1025             max_y = MAX((unsigned int)y, max_y);
1026
1027             unsigned char *trace_t = get_trace_pixel(trace_px, x, y, width);
1028             if (!is_pixel_checked(trace_t)) {
1029                 mark_pixel_checked(trace_t);
1030
1031                 if (y == 0) {
1032                     if (bbox->min()[Geom::Y] > screen.min()[Geom::Y]) {
1033                         aborted = true; break;
1034                     } else {
1035                         reached_screen_boundary = true;
1036                     }
1037                 }
1038
1039                 if (y == y_limit) {
1040                     if (bbox->max()[Geom::Y] < screen.max()[Geom::Y]) {
1041                         aborted = true; break;
1042                     } else {
1043                         reached_screen_boundary = true;
1044                     }
1045                 }
1046
1047                 bci.is_left = true;
1048                 bci.x = x;
1049                 bci.y = y;
1050
1051                 ScanlineCheckResult result = perform_bitmap_scanline_check(&fill_queue, px, trace_px, orig_color, bci, &min_x, &max_x);
1052
1053                 switch (result) {
1054                     case SCANLINE_CHECK_ABORTED:
1055                         aborted = true;
1056                         break;
1057                     case SCANLINE_CHECK_BOUNDARY:
1058                         reached_screen_boundary = true;
1059                         break;
1060                     default:
1061                         break;
1062                 }
1063
1064                 if (bci.x < width) {
1065                     trace_t++;
1066                     if (!is_pixel_checked(trace_t) && !is_pixel_queued(trace_t)) {
1067                         mark_pixel_checked(trace_t);
1068                         bci.is_left = false;
1069                         bci.x = x + 1;
1070
1071                         result = perform_bitmap_scanline_check(&fill_queue, px, trace_px, orig_color, bci, &min_x, &max_x);
1072
1073                         switch (result) {
1074                             case SCANLINE_CHECK_ABORTED:
1075                                 aborted = true;
1076                                 break;
1077                             case SCANLINE_CHECK_BOUNDARY:
1078                                 reached_screen_boundary = true;
1079                                 break;
1080                             default:
1081                                 break;
1082                         }
1083                     }
1084                 }
1085             }
1086
1087             bci.current_step++;
1088
1089             if (bci.current_step > bci.max_queue_size) {
1090                 aborted = true;
1091             }
1092         }
1093     }
1094
1095     g_free(px);
1096
1097     if (aborted) {
1098         g_free(trace_px);
1099         desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE, _("<b>Area is not bounded</b>, cannot fill."));
1100         return;
1101     }
1102
1103     if (reached_screen_boundary) {
1104         desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE, _("<b>Only the visible part of the bounded area was filled.</b> If you want to fill all of the area, undo, zoom out, and fill again."));
1105     }
1106
1107     unsigned int trace_padding = bci.radius + 1;
1108     if (min_y > trace_padding) { min_y -= trace_padding; }
1109     if (max_y < (y_limit - trace_padding)) { max_y += trace_padding; }
1110     if (min_x > trace_padding) { min_x -= trace_padding; }
1111     if (max_x < (width - 1 - trace_padding)) { max_x += trace_padding; }
1112
1113     Geom::Point min_start = Geom::Point(min_x, min_y);
1114
1115     affine = scale * Geom::Translate(-origin * scale - min_start);
1116     Geom::Matrix inverted_affine = Geom::Matrix(affine).inverse();
1117
1118     do_trace(bci, trace_px, desktop, inverted_affine, min_x, max_x, min_y, max_y, union_with_selection);
1119
1120     g_free(trace_px);
1121
1122     sp_document_done(document, SP_VERB_CONTEXT_PAINTBUCKET, _("Fill bounded area"));
1123 }
1124
1125 static gint sp_flood_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
1126 {
1127     gint ret = FALSE;
1128
1129     SPDesktop *desktop = event_context->desktop;
1130
1131     switch (event->type) {
1132     case GDK_BUTTON_PRESS:
1133         if ((event->button.state & GDK_CONTROL_MASK) && event->button.button == 1 && !event_context->space_panning) {
1134             Geom::Point const button_w(event->button.x,
1135                                        event->button.y);
1136
1137             SPItem *item = sp_event_context_find_item (desktop, button_w, TRUE, TRUE);
1138
1139             Inkscape::XML::Node *pathRepr = SP_OBJECT_REPR(item);
1140             /* Set style */
1141             sp_desktop_apply_style_tool (desktop, pathRepr, "/tools/paintbucket", false);
1142             sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_PAINTBUCKET, _("Set style on object"));
1143             ret = TRUE;
1144         }
1145         break;
1146     default:
1147         break;
1148     }
1149
1150     if (((SPEventContextClass *) parent_class)->item_handler) {
1151         ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
1152     }
1153
1154     return ret;
1155 }
1156
1157 static gint sp_flood_context_root_handler(SPEventContext *event_context, GdkEvent *event)
1158 {
1159     static bool dragging;
1160
1161     gint ret = FALSE;
1162     SPDesktop *desktop = event_context->desktop;
1163
1164     switch (event->type) {
1165     case GDK_BUTTON_PRESS:
1166         if (event->button.button == 1 && !event_context->space_panning) {
1167             if (!(event->button.state & GDK_CONTROL_MASK)) {
1168                 Geom::Point const button_w(event->button.x,
1169                                            event->button.y);
1170
1171                 if (Inkscape::have_viable_layer(desktop, event_context->defaultMessageContext())) {
1172                     // save drag origin
1173                     event_context->xp = (gint) button_w[Geom::X];
1174                     event_context->yp = (gint) button_w[Geom::Y];
1175                     event_context->within_tolerance = true;
1176
1177                     dragging = true;
1178
1179                     Geom::Point const p(desktop->w2d(button_w));
1180                     Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_TOUCHPATH);
1181                     Inkscape::Rubberband::get(desktop)->start(desktop, p);
1182                 }
1183             }
1184         }
1185     case GDK_MOTION_NOTIFY:
1186         if ( dragging
1187              && ( event->motion.state & GDK_BUTTON1_MASK ) && !event_context->space_panning)
1188         {
1189             if ( event_context->within_tolerance
1190                  && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
1191                  && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
1192                 break; // do not drag if we're within tolerance from origin
1193             }
1194
1195             event_context->within_tolerance = false;
1196
1197             Geom::Point const motion_pt(event->motion.x, event->motion.y);
1198             Geom::Point const p(desktop->w2d(motion_pt));
1199             if (Inkscape::Rubberband::get(desktop)->is_started()) {
1200                 Inkscape::Rubberband::get(desktop)->move(p);
1201                 event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Draw over</b> areas to add to fill, hold <b>Alt</b> for touch fill"));
1202                 gobble_motion_events(GDK_BUTTON1_MASK);
1203             }
1204         }
1205         break;
1206
1207     case GDK_BUTTON_RELEASE:
1208         if (event->button.button == 1 && !event_context->space_panning) {
1209             Inkscape::Rubberband *r = Inkscape::Rubberband::get(desktop);
1210             if (r->is_started()) {
1211                 // set "busy" cursor
1212                 desktop->setWaitingCursor();
1213
1214                 if (SP_IS_EVENT_CONTEXT(event_context)) {
1215                     // Since setWaitingCursor runs main loop iterations, we may have already left this tool!
1216                     // So check if the tool is valid before doing anything
1217                     dragging = false;
1218
1219                     bool is_point_fill = event_context->within_tolerance;
1220                     bool is_touch_fill = event->button.state & GDK_MOD1_MASK;
1221
1222                     sp_flood_do_flood_fill(event_context, event, event->button.state & GDK_SHIFT_MASK, is_point_fill, is_touch_fill);
1223
1224                     desktop->clearWaitingCursor();
1225                     // restore cursor when done; note that it may already be different if e.g. user
1226                     // switched to another tool during interruptible tracing or drawing, in which case do nothing
1227
1228                     ret = TRUE;
1229                 }
1230
1231                 r->stop();
1232
1233                 if (SP_IS_EVENT_CONTEXT(event_context)) {
1234                     event_context->defaultMessageContext()->clear();
1235                 }
1236             }
1237         }
1238         break;
1239     case GDK_KEY_PRESS:
1240         switch (get_group0_keyval (&event->key)) {
1241         case GDK_Up:
1242         case GDK_Down:
1243         case GDK_KP_Up:
1244         case GDK_KP_Down:
1245             // prevent the zoom field from activation
1246             if (!MOD__CTRL_ONLY)
1247                 ret = TRUE;
1248             break;
1249         default:
1250             break;
1251         }
1252         break;
1253     default:
1254         break;
1255     }
1256
1257     if (!ret) {
1258         if (((SPEventContextClass *) parent_class)->root_handler) {
1259             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
1260         }
1261     }
1262
1263     return ret;
1264 }
1265
1266
1267 static void sp_flood_finish(SPFloodContext *rc)
1268 {
1269     rc->_message_context->clear();
1270
1271     if ( rc->item != NULL ) {
1272         SPDesktop * desktop;
1273
1274         desktop = SP_EVENT_CONTEXT_DESKTOP(rc);
1275
1276         SP_OBJECT(rc->item)->updateRepr();
1277
1278         sp_canvas_end_forced_full_redraws(desktop->canvas);
1279
1280         sp_desktop_selection(desktop)->set(rc->item);
1281         sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_PAINTBUCKET,
1282                         _("Fill bounded area"));
1283
1284         rc->item = NULL;
1285     }
1286 }
1287
1288 void flood_channels_set_channels( gint channels )
1289 {
1290     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1291     prefs->setInt("/tools/paintbucket/channels", channels);
1292 }
1293
1294 /*
1295   Local Variables:
1296   mode:c++
1297   c-file-style:"stroustrup"
1298   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1299   indent-tabs-mode:nil
1300   fill-column:99
1301   End:
1302 */
1303 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :