src/flood-context.cpp

   1 /** @file
   2  * @brief Bucket fill drawing context, works by bitmap filling an area on a rendered version
   3  * of the current display and then tracing the result using potrace.
   4  */
   5 /* Author:
   6  *   Lauris Kaplinski <lauris@kaplinski.com>
   7  *   bulia byak <buliabyak@users.sf.net>
   8  *   John Bintz <jcoswell@coswellproductions.org>
   9  *   Jon A. Cruz <jon@joncruz.org>
  10  *   Abhishek Sharma
  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 using Inkscape::DocumentUndo;
  78
  79 static void sp_flood_context_class_init(SPFloodContextClass *klass);
  80 static void sp_flood_context_init(SPFloodContext *flood_context);
  81 static void sp_flood_context_dispose(GObject *object);
  82
  83 static void sp_flood_context_setup(SPEventContext *ec);
  84
  85 static gint sp_flood_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  86 static gint sp_flood_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  87
  88 static void sp_flood_finish(SPFloodContext *rc);
  89
  90 static SPEventContextClass *parent_class;
  91
  92
  93 GtkType sp_flood_context_get_type()
  94 {
  95     static GType type = 0;
  96     if (!type) {
  97         GTypeInfo info = {
  98             sizeof(SPFloodContextClass),
  99             NULL, NULL,
 100             (GClassInitFunc) sp_flood_context_class_init,
 101             NULL, NULL,
 102             sizeof(SPFloodContext),
 103             4,
 104             (GInstanceInitFunc) sp_flood_context_init,
 105             NULL,    /* value_table */
 106         };
 107         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPFloodContext", &info, (GTypeFlags) 0);
 108     }
 109     return type;
 110 }
 111
 112 static void sp_flood_context_class_init(SPFloodContextClass *klass)
 113 {
 114     GObjectClass *object_class = (GObjectClass *) klass;
 115     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
 116
 117     parent_class = (SPEventContextClass *) g_type_class_peek_parent(klass);
 118
 119     object_class->dispose = sp_flood_context_dispose;
 120
 121     event_context_class->setup = sp_flood_context_setup;
 122     event_context_class->root_handler  = sp_flood_context_root_handler;
 123     event_context_class->item_handler  = sp_flood_context_item_handler;
 124 }
 125
 126 static void sp_flood_context_init(SPFloodContext *flood_context)
 127 {
 128     SPEventContext *event_context = SP_EVENT_CONTEXT(flood_context);
 129
 130     event_context->cursor_shape = cursor_paintbucket_xpm;
 131     event_context->hot_x = 11;
 132     event_context->hot_y = 30;
 133     event_context->xp = 0;
 134     event_context->yp = 0;
 135     event_context->tolerance = 4;
 136     event_context->within_tolerance = false;
 137     event_context->item_to_select = NULL;
 138
 139     flood_context->item = NULL;
 140
 141     new (&flood_context->sel_changed_connection) sigc::connection();
 142 }
 143
 144 static void sp_flood_context_dispose(GObject *object)
 145 {
 146     SPFloodContext *rc = SP_FLOOD_CONTEXT(object);
 147     SPEventContext *ec = SP_EVENT_CONTEXT(object);
 148
 149     rc->sel_changed_connection.disconnect();
 150     rc->sel_changed_connection.~connection();
 151
 152     delete ec->shape_editor;
 153     ec->shape_editor = NULL;
 154
 155     /* fixme: This is necessary because we do not grab */
 156     if (rc->item) {
 157         sp_flood_finish(rc);
 158     }
 159
 160     if (rc->_message_context) {
 161         delete rc->_message_context;
 162     }
 163
 164     G_OBJECT_CLASS(parent_class)->dispose(object);
 165 }
 166
 167 /**
 168 \brief  Callback that processes the "changed" signal on the selection;
 169 destroys old and creates new knotholder
 170 */
 171 void sp_flood_context_selection_changed(Inkscape::Selection *selection, gpointer data)
 172 {
 173     SPFloodContext *rc = SP_FLOOD_CONTEXT(data);
 174     SPEventContext *ec = SP_EVENT_CONTEXT(rc);
 175
 176     ec->shape_editor->unset_item(SH_KNOTHOLDER);
 177     SPItem *item = selection->singleItem();
 178     ec->shape_editor->set_item(item, SH_KNOTHOLDER);
 179 }
 180
 181 static void sp_flood_context_setup(SPEventContext *ec)
 182 {
 183     SPFloodContext *rc = SP_FLOOD_CONTEXT(ec);
 184
 185     if (((SPEventContextClass *) parent_class)->setup) {
 186         ((SPEventContextClass *) parent_class)->setup(ec);
 187     }
 188
 189     ec->shape_editor = new ShapeEditor(ec->desktop);
 190
 191     SPItem *item = sp_desktop_selection(ec->desktop)->singleItem();
 192     if (item) {
 193         ec->shape_editor->set_item(item, SH_KNOTHOLDER);
 194     }
 195
 196     rc->sel_changed_connection.disconnect();
 197     rc->sel_changed_connection = sp_desktop_selection(ec->desktop)->connectChanged(
 198         sigc::bind(sigc::ptr_fun(&sp_flood_context_selection_changed), (gpointer)rc)
 199     );
 200
 201     rc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 202
 203     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 204     if (prefs->getBool("/tools/paintbucket/selcue")) {
 205         rc->enableSelectionCue();
 206     }
 207 }
 208
 209 /**
 210  * \brief Merge a pixel with the background color.
 211  * \param orig The pixel to merge with the background.
 212  * \param bg The background color.
 213  * \param base The pixel to merge the original and background into.
 214  */
 215 inline static void
 216 merge_pixel_with_background (unsigned char *orig, unsigned char *bg,
 217            unsigned char *base)
 218 {
 219     int precalc_bg_alpha = (255 * (255 - bg[3])) / 255;
 220
 221     for (int i = 0; i < 3; i++) {
 222         base[i] = precalc_bg_alpha + (bg[i] * bg[3]) / 255;
 223         base[i] = (base[i] * (255 - orig[3])) / 255 + (orig[i] * orig[3]) / 255;
 224     }
 225 }
 226
 227 /**
 228  * \brief Get the pointer to a pixel in a pixel buffer.
 229  * \param px The pixel buffer.
 230  * \param x The X coordinate.
 231  * \param y The Y coordinate.
 232  * \param width The width of the pixel buffer.
 233  */
 234 inline unsigned char * get_pixel(guchar *px, int x, int y, int width) {
 235     return px + (x + y * width) * 4;
 236 }
 237
 238 inline unsigned char * get_trace_pixel(guchar *trace_px, int x, int y, int width) {
 239     return trace_px + (x + y * width);
 240 }
 241
 242 /**
 243  * \brief Generate the list of trace channel selection entries.
 244  */
 245 GList * flood_channels_dropdown_items_list() {
 246     GList *glist = NULL;
 247
 248     glist = g_list_append (glist, _("Visible Colors"));
 249     glist = g_list_append (glist, _("Red"));
 250     glist = g_list_append (glist, _("Green"));
 251     glist = g_list_append (glist, _("Blue"));
 252     glist = g_list_append (glist, _("Hue"));
 253     glist = g_list_append (glist, _("Saturation"));
 254     glist = g_list_append (glist, _("Lightness"));
 255     glist = g_list_append (glist, _("Alpha"));
 256
 257     return glist;
 258 }
 259
 260 /**
 261  * \brief Generate the list of autogap selection entries.
 262  */
 263 GList * flood_autogap_dropdown_items_list() {
 264     GList *glist = NULL;
 265
 266     glist = g_list_append (glist, (void*) C_("Flood autogap", "None"));
 267     glist = g_list_append (glist, (void*) C_("Flood autogap", "Small"));
 268     glist = g_list_append (glist, (void*) C_("Flood autogap", "Medium"));
 269     glist = g_list_append (glist, (void*) C_("Flood autogap", "Large"));
 270
 271     return glist;
 272 }
 273
 274 /**
 275  * \brief Compare a pixel in a pixel buffer with another pixel to determine if a point should be included in the fill operation.
 276  * \param check The pixel in the pixel buffer to check.
 277  * \param orig The original selected pixel to use as the fill target color.
 278  * \param merged_orig_pixel The original pixel merged with the background.
 279  * \param dtc The desktop background color.
 280  * \param threshold The fill threshold.
 281  * \param method The fill method to use as defined in PaintBucketChannels.
 282  */
 283 static bool compare_pixels(unsigned char *check, unsigned char *orig, unsigned char *merged_orig_pixel, unsigned char *dtc, int threshold, PaintBucketChannels method) {
 284     int diff = 0;
 285     float hsl_check[3], hsl_orig[3];
 286
 287     if ((method == FLOOD_CHANNELS_H) ||
 288         (method == FLOOD_CHANNELS_S) ||
 289         (method == FLOOD_CHANNELS_L)) {
 290         sp_color_rgb_to_hsl_floatv(hsl_check, check[0] / 255.0, check[1] / 255.0, check[2] / 255.0);
 291         sp_color_rgb_to_hsl_floatv(hsl_orig, orig[0] / 255.0, orig[1] / 255.0, orig[2] / 255.0);
 292     }
 293
 294     switch (method) {
 295         case FLOOD_CHANNELS_ALPHA:
 296             return ((int)abs(check[3] - orig[3]) <= threshold);
 297         case FLOOD_CHANNELS_R:
 298             return ((int)abs(check[0] - orig[0]) <= threshold);
 299         case FLOOD_CHANNELS_G:
 300             return ((int)abs(check[1] - orig[1]) <= threshold);
 301         case FLOOD_CHANNELS_B:
 302             return ((int)abs(check[2] - orig[2]) <= threshold);
 303         case FLOOD_CHANNELS_RGB:
 304             unsigned char merged_check[3];
 305
 306             merge_pixel_with_background(check, dtc, merged_check);
 307
 308             for (int i = 0; i < 3; i++) {
 309               diff += (int)abs(merged_check[i] - merged_orig_pixel[i]);
 310             }
 311             return ((diff / 3) <= ((threshold * 3) / 4));
 312
 313         case FLOOD_CHANNELS_H:
 314             return ((int)(fabs(hsl_check[0] - hsl_orig[0]) * 100.0) <= threshold);
 315         case FLOOD_CHANNELS_S:
 316             return ((int)(fabs(hsl_check[1] - hsl_orig[1]) * 100.0) <= threshold);
 317         case FLOOD_CHANNELS_L:
 318             return ((int)(fabs(hsl_check[2] - hsl_orig[2]) * 100.0) <= threshold);
 319     }
 320
 321     return false;
 322 }
 323
 324 enum {
 325   PIXEL_CHECKED = 1,
 326   PIXEL_QUEUED  = 2,
 327   PIXEL_PAINTABLE = 4,
 328   PIXEL_NOT_PAINTABLE = 8,
 329   PIXEL_COLORED = 16
 330 };
 331
 332 static inline bool is_pixel_checked(unsigned char *t) { return (*t & PIXEL_CHECKED) == PIXEL_CHECKED; }
 333 static inline bool is_pixel_queued(unsigned char *t) { return (*t & PIXEL_QUEUED) == PIXEL_QUEUED; }
 334 static inline bool is_pixel_paintability_checked(unsigned char *t) {
 335   return !((*t & PIXEL_PAINTABLE) == 0) && ((*t & PIXEL_NOT_PAINTABLE) == 0);
 336 }
 337 static inline bool is_pixel_paintable(unsigned char *t) { return (*t & PIXEL_PAINTABLE) == PIXEL_PAINTABLE; }
 338 static inline bool is_pixel_colored(unsigned char *t) { return (*t & PIXEL_COLORED) == PIXEL_COLORED; }
 339
 340 static inline void mark_pixel_checked(unsigned char *t) { *t |= PIXEL_CHECKED; }
 341 static inline void mark_pixel_unchecked(unsigned char *t) { *t ^= PIXEL_CHECKED; }
 342 static inline void mark_pixel_queued(unsigned char *t) { *t |= PIXEL_QUEUED; }
 343 static inline void mark_pixel_paintable(unsigned char *t) { *t |= PIXEL_PAINTABLE; *t ^= PIXEL_NOT_PAINTABLE; }
 344 static inline void mark_pixel_not_paintable(unsigned char *t) { *t |= PIXEL_NOT_PAINTABLE; *t ^= PIXEL_PAINTABLE; }
 345 static inline void mark_pixel_colored(unsigned char *t) { *t |= PIXEL_COLORED; }
 346
 347 static inline void clear_pixel_paintability(unsigned char *t) { *t ^= PIXEL_PAINTABLE; *t ^= PIXEL_NOT_PAINTABLE; }
 348
 349 struct bitmap_coords_info {
 350     bool is_left;
 351     unsigned int x;
 352     unsigned int y;
 353     int y_limit;
 354     unsigned int width;
 355     unsigned int height;
 356     unsigned int threshold;
 357     unsigned int radius;
 358     PaintBucketChannels method;
 359     unsigned char *dtc;
 360     unsigned char *merged_orig_pixel;
 361     Geom::Rect bbox;
 362     Geom::Rect screen;
 363     unsigned int max_queue_size;
 364     unsigned int current_step;
 365 };
 366
 367 /**
 368  * \brief Check if a pixel can be included in the fill.
 369  * \param px The rendered pixel buffer to check.
 370  * \param trace_t The pixel in the trace pixel buffer to check or mark.
 371  * \param x The X coordinate.
 372  * \param y The y coordinate.
 373  * \param orig_color The original selected pixel to use as the fill target color.
 374  * \param bci The bitmap_coords_info structure.
 375  */
 376 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) {
 377     if (is_pixel_paintability_checked(trace_t)) {
 378         return is_pixel_paintable(trace_t);
 379     } else {
 380         unsigned char *t = get_pixel(px, x, y, bci.width);
 381         if (compare_pixels(t, orig_color, bci.merged_orig_pixel, bci.dtc, bci.threshold, bci.method)) {
 382             mark_pixel_paintable(trace_t);
 383             return true;
 384         } else {
 385             mark_pixel_not_paintable(trace_t);
 386             return false;
 387         }
 388     }
 389 }
 390
 391 /**
 392  * \brief Perform the bitmap-to-vector tracing and place the traced path onto the document.
 393  * \param px The trace pixel buffer to trace to SVG.
 394  * \param desktop The desktop on which to place the final SVG path.
 395  * \param transform The transform to apply to the final SVG path.
 396  * \param union_with_selection If true, merge the final SVG path with the current selection.
 397  */
 398 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) {
 399     SPDocument *document = sp_desktop_document(desktop);
 400
 401     unsigned char *trace_t;
 402
 403     GrayMap *gray_map = GrayMapCreate((max_x - min_x + 1), (max_y - min_y + 1));
 404     unsigned int gray_map_y = 0;
 405     for (unsigned int y = min_y; y <= max_y; y++) {
 406         unsigned long *gray_map_t = gray_map->rows[gray_map_y];
 407
 408         trace_t = get_trace_pixel(trace_px, min_x, y, bci.width);
 409         for (unsigned int x = min_x; x <= max_x; x++) {
 410             *gray_map_t = is_pixel_colored(trace_t) ? GRAYMAP_BLACK : GRAYMAP_WHITE;
 411             gray_map_t++;
 412             trace_t++;
 413         }
 414         gray_map_y++;
 415     }
 416
 417     Inkscape::Trace::Potrace::PotraceTracingEngine pte;
 418     pte.keepGoing = 1;
 419     std::vector<Inkscape::Trace::TracingEngineResult> results = pte.traceGrayMap(gray_map);
 420     gray_map->destroy(gray_map);
 421
 422     //XML Tree being used here directly while it shouldn't be...."
 423     Inkscape::XML::Document *xml_doc = desktop->doc()->getReprDoc();
 424
 425     long totalNodeCount = 0L;
 426
 427     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 428     double offset = prefs->getDouble("/tools/paintbucket/offset", 0.0);
 429
 430     for (unsigned int i=0 ; i<results.size() ; i++) {
 431         Inkscape::Trace::TracingEngineResult result = results[i];
 432         totalNodeCount += result.getNodeCount();
 433
 434         Inkscape::XML::Node *pathRepr = xml_doc->createElement("svg:path");
 435         /* Set style */
 436         sp_desktop_apply_style_tool (desktop, pathRepr, "/tools/paintbucket", false);
 437
 438         Geom::PathVector pathv = sp_svg_read_pathv(result.getPathData().c_str());
 439         Path *path = new Path;
 440         path->LoadPathVector(pathv);
 441
 442         if (offset != 0) {
 443
 444             Shape *path_shape = new Shape();
 445
 446             path->ConvertWithBackData(0.03);
 447             path->Fill(path_shape, 0);
 448             delete path;
 449
 450             Shape *expanded_path_shape = new Shape();
 451
 452             expanded_path_shape->ConvertToShape(path_shape, fill_nonZero);
 453             path_shape->MakeOffset(expanded_path_shape, offset * desktop->current_zoom(), join_round, 4);
 454             expanded_path_shape->ConvertToShape(path_shape, fill_positive);
 455
 456             Path *expanded_path = new Path();
 457
 458             expanded_path->Reset();
 459             expanded_path_shape->ConvertToForme(expanded_path);
 460             expanded_path->ConvertEvenLines(1.0);
 461             expanded_path->Simplify(1.0);
 462
 463             delete path_shape;
 464             delete expanded_path_shape;
 465
 466             gchar *str = expanded_path->svg_dump_path();
 467             if (str && *str) {
 468                 pathRepr->setAttribute("d", str);
 469                 g_free(str);
 470             } else {
 471                 desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE, _("<b>Too much inset</b>, the result is empty."));
 472                 Inkscape::GC::release(pathRepr);
 473                 g_free(str);
 474                 return;
 475             }
 476
 477             delete expanded_path;
 478
 479         } else {
 480             gchar *str = path->svg_dump_path();
 481             delete path;
 482             pathRepr->setAttribute("d", str);
 483             g_free(str);
 484         }
 485
 486         desktop->currentLayer()->addChild(pathRepr,NULL);
 487
 488         SPObject *reprobj = document->getObjectByRepr(pathRepr);
 489         if (reprobj) {
 490             SP_ITEM(reprobj)->doWriteTransform(pathRepr, transform, NULL);
 491
 492             // premultiply the item transform by the accumulated parent transform in the paste layer
 493             Geom::Matrix local (SP_GROUP(desktop->currentLayer())->i2doc_affine());
 494             if (!local.isIdentity()) {
 495                 gchar const *t_str = pathRepr->attribute("transform");
 496                 Geom::Matrix item_t (Geom::identity());
 497                 if (t_str)
 498                     sp_svg_transform_read(t_str, &item_t);
 499                 item_t *= local.inverse();
 500                 // (we're dealing with unattached repr, so we write to its attr instead of using sp_item_set_transform)
 501                 gchar *affinestr=sp_svg_transform_write(item_t);
 502                 pathRepr->setAttribute("transform", affinestr);
 503                 g_free(affinestr);
 504             }
 505
 506             Inkscape::Selection *selection = sp_desktop_selection(desktop);
 507
 508             pathRepr->setPosition(-1);
 509
 510             if (union_with_selection) {
 511                 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)));
 512                 selection->add(reprobj);
 513                 sp_selected_path_union_skip_undo(desktop);
 514             } else {
 515                 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)));
 516                 selection->set(reprobj);
 517             }
 518
 519         }
 520
 521         Inkscape::GC::release(pathRepr);
 522
 523     }
 524 }
 525
 526 /**
 527  * \brief The possible return states of perform_bitmap_scanline_check()
 528  */
 529 enum ScanlineCheckResult {
 530     SCANLINE_CHECK_OK,
 531     SCANLINE_CHECK_ABORTED,
 532     SCANLINE_CHECK_BOUNDARY
 533 };
 534
 535 /**
 536  * \brief Determine if the provided coordinates are within the pixel buffer limits.
 537  * \param x The X coordinate.
 538  * \param y The Y coordinate.
 539  * \param bci The bitmap_coords_info structure.
 540  */
 541 inline static bool coords_in_range(unsigned int x, unsigned int y, bitmap_coords_info bci) {
 542     return (x < bci.width) &&
 543            (y < bci.height);
 544 }
 545
 546 #define PAINT_DIRECTION_LEFT 1
 547 #define PAINT_DIRECTION_RIGHT 2
 548 #define PAINT_DIRECTION_UP 4
 549 #define PAINT_DIRECTION_DOWN 8
 550 #define PAINT_DIRECTION_ALL 15
 551
 552 /**
 553  * \brief Paint a pixel or a square (if autogap is enabled) on the trace pixel buffer
 554  * \param px The rendered pixel buffer to check.
 555  * \param trace_px The trace pixel buffer.
 556  * \param orig_color The original selected pixel to use as the fill target color.
 557  * \param bci The bitmap_coords_info structure.
 558  * \param original_point_trace_t The original pixel in the trace pixel buffer to check.
 559  */
 560 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) {
 561     if (bci.radius == 0) {
 562         mark_pixel_colored(original_point_trace_t);
 563         return PAINT_DIRECTION_ALL;
 564     } else {
 565         unsigned char *trace_t;
 566
 567         bool can_paint_up = true;
 568         bool can_paint_down = true;
 569         bool can_paint_left = true;
 570         bool can_paint_right = true;
 571
 572         for (unsigned int ty = bci.y - bci.radius; ty <= bci.y + bci.radius; ty++) {
 573             for (unsigned int tx = bci.x - bci.radius; tx <= bci.x + bci.radius; tx++) {
 574                 if (coords_in_range(tx, ty, bci)) {
 575                     trace_t = get_trace_pixel(trace_px, tx, ty, bci.width);
 576                     if (!is_pixel_colored(trace_t)) {
 577                         if (check_if_pixel_is_paintable(px, trace_t, tx, ty, orig_color, bci)) {
 578                             mark_pixel_colored(trace_t);
 579                         } else {
 580                             if (tx < bci.x) { can_paint_left = false; }
 581                             if (tx > bci.x) { can_paint_right = false; }
 582                             if (ty < bci.y) { can_paint_up = false; }
 583                             if (ty > bci.y) { can_paint_down = false; }
 584                         }
 585                     }
 586                 }
 587             }
 588         }
 589
 590         unsigned int paint_directions = 0;
 591         if (can_paint_left) { paint_directions += PAINT_DIRECTION_LEFT; }
 592         if (can_paint_right) { paint_directions += PAINT_DIRECTION_RIGHT; }
 593         if (can_paint_up) { paint_directions += PAINT_DIRECTION_UP; }
 594         if (can_paint_down) { paint_directions += PAINT_DIRECTION_DOWN; }
 595
 596         return paint_directions;
 597     }
 598 }
 599
 600 /**
 601  * \brief Push a point to be checked onto the bottom of the rendered pixel buffer check queue.
 602  * \param fill_queue The fill queue to add the point to.
 603  * \param max_queue_size The maximum size of the fill queue.
 604  * \param trace_t The trace pixel buffer pixel.
 605  * \param x The X coordinate.
 606  * \param y The Y coordinate.
 607  */
 608 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) {
 609     if (!is_pixel_queued(trace_t)) {
 610         if ((fill_queue->size() < max_queue_size)) {
 611             fill_queue->push_back(Geom::Point(x, y));
 612             mark_pixel_queued(trace_t);
 613         }
 614     }
 615 }
 616
 617 /**
 618  * \brief Shift a point to be checked onto the top of the rendered pixel buffer check queue.
 619  * \param fill_queue The fill queue to add the point to.
 620  * \param max_queue_size The maximum size of the fill queue.
 621  * \param trace_t The trace pixel buffer pixel.
 622  * \param x The X coordinate.
 623  * \param y The Y coordinate.
 624  */
 625 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) {
 626     if (!is_pixel_queued(trace_t)) {
 627         if ((fill_queue->size() < max_queue_size)) {
 628             fill_queue->push_front(Geom::Point(x, y));
 629             mark_pixel_queued(trace_t);
 630         }
 631     }
 632 }
 633
 634 /**
 635  * \brief Scan a row in the rendered pixel buffer and add points to the fill queue as necessary.
 636  * \param fill_queue The fill queue to add the point to.
 637  * \param px The rendered pixel buffer.
 638  * \param trace_px The trace pixel buffer.
 639  * \param orig_color The original selected pixel to use as the fill target color.
 640  * \param bci The bitmap_coords_info structure.
 641  */
 642 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) {
 643     bool aborted = false;
 644     bool reached_screen_boundary = false;
 645     bool ok;
 646
 647     bool keep_tracing;
 648     bool initial_paint = true;
 649
 650     unsigned char *current_trace_t = get_trace_pixel(trace_px, bci.x, bci.y, bci.width);
 651     unsigned int paint_directions;
 652
 653     bool currently_painting_top = false;
 654     bool currently_painting_bottom = false;
 655
 656     unsigned int top_ty = bci.y - 1;
 657     unsigned int bottom_ty = bci.y + 1;
 658
 659     bool can_paint_top = (top_ty > 0);
 660     bool can_paint_bottom = (bottom_ty < bci.height);
 661
 662     Geom::Point t = fill_queue->front();
 663
 664     do {
 665         ok = false;
 666         if (bci.is_left) {
 667             keep_tracing = (bci.x != 0);
 668         } else {
 669             keep_tracing = (bci.x < bci.width);
 670         }
 671
 672         *min_x = MIN(*min_x, bci.x);
 673         *max_x = MAX(*max_x, bci.x);
 674
 675         if (keep_tracing) {
 676             if (check_if_pixel_is_paintable(px, current_trace_t, bci.x, bci.y, orig_color, bci)) {
 677                 paint_directions = paint_pixel(px, trace_px, orig_color, bci, current_trace_t);
 678                 if (bci.radius == 0) {
 679                     mark_pixel_checked(current_trace_t);
 680                     if ((t[Geom::X] == bci.x) && (t[Geom::Y] == bci.y)) {
 681                         fill_queue->pop_front(); t = fill_queue->front();
 682                     }
 683                 }
 684
 685                 if (can_paint_top) {
 686                     if (paint_directions & PAINT_DIRECTION_UP) {
 687                         unsigned char *trace_t = current_trace_t - bci.width;
 688                         if (!is_pixel_queued(trace_t)) {
 689                             bool ok_to_paint = check_if_pixel_is_paintable(px, trace_t, bci.x, top_ty, orig_color, bci);
 690
 691                             if (initial_paint) { currently_painting_top = !ok_to_paint; }
 692
 693                             if (ok_to_paint && (!currently_painting_top)) {
 694                                 currently_painting_top = true;
 695                                 push_point_onto_queue(fill_queue, bci.max_queue_size, trace_t, bci.x, top_ty);
 696                             }
 697                             if ((!ok_to_paint) && currently_painting_top) {
 698                                 currently_painting_top = false;
 699                             }
 700                         }
 701                     }
 702                 }
 703
 704                 if (can_paint_bottom) {
 705                     if (paint_directions & PAINT_DIRECTION_DOWN) {
 706                         unsigned char *trace_t = current_trace_t + bci.width;
 707                         if (!is_pixel_queued(trace_t)) {
 708                             bool ok_to_paint = check_if_pixel_is_paintable(px, trace_t, bci.x, bottom_ty, orig_color, bci);
 709
 710                             if (initial_paint) { currently_painting_bottom = !ok_to_paint; }
 711
 712                             if (ok_to_paint && (!currently_painting_bottom)) {
 713                                 currently_painting_bottom = true;
 714                                 push_point_onto_queue(fill_queue, bci.max_queue_size, trace_t, bci.x, bottom_ty);
 715                             }
 716                             if ((!ok_to_paint) && currently_painting_bottom) {
 717                                 currently_painting_bottom = false;
 718                             }
 719                         }
 720                     }
 721                 }
 722
 723                 if (bci.is_left) {
 724                     if (paint_directions & PAINT_DIRECTION_LEFT) {
 725                         bci.x--; current_trace_t--;
 726                         ok = true;
 727                     }
 728                 } else {
 729                     if (paint_directions & PAINT_DIRECTION_RIGHT) {
 730                         bci.x++; current_trace_t++;
 731                         ok = true;
 732                     }
 733                 }
 734
 735                 initial_paint = false;
 736             }
 737         } else {
 738             if (bci.bbox.min()[Geom::X] > bci.screen.min()[Geom::X]) {
 739                 aborted = true; break;
 740             } else {
 741                 reached_screen_boundary = true;
 742             }
 743         }
 744     } while (ok);
 745
 746     if (aborted) { return SCANLINE_CHECK_ABORTED; }
 747     if (reached_screen_boundary) { return SCANLINE_CHECK_BOUNDARY; }
 748     return SCANLINE_CHECK_OK;
 749 }
 750
 751 /**
 752  * \brief Sort the rendered pixel buffer check queue vertically.
 753  */
 754 static bool sort_fill_queue_vertical(Geom::Point a, Geom::Point b) {
 755     return a[Geom::Y] > b[Geom::Y];
 756 }
 757
 758 /**
 759  * \brief Sort the rendered pixel buffer check queue horizontally.
 760  */
 761 static bool sort_fill_queue_horizontal(Geom::Point a, Geom::Point b) {
 762     return a[Geom::X] > b[Geom::X];
 763 }
 764
 765 /**
 766  * \brief Perform a flood fill operation.
 767  * \param event_context The event context for this tool.
 768  * \param event The details of this event.
 769  * \param union_with_selection If true, union the new fill with the current selection.
 770  * \param is_point_fill If false, use the Rubberband "touch selection" to get the initial points for the fill.
 771  * \param is_touch_fill If true, use only the initial contact point in the Rubberband "touch selection" as the fill target color.
 772  */
 773 static void sp_flood_do_flood_fill(SPEventContext *event_context, GdkEvent *event, bool union_with_selection, bool is_point_fill, bool is_touch_fill) {
 774     SPDesktop *desktop = event_context->desktop;
 775     SPDocument *document = sp_desktop_document(desktop);
 776
 777     /* Create new arena */
 778     NRArena *arena = NRArena::create();
 779     unsigned dkey = SPItem::display_key_new(1);
 780
 781     document->ensureUpToDate();
 782
 783     SPItem *document_root = SP_ITEM(document->getRoot());
 784     Geom::OptRect bbox = document_root->getBounds(Geom::identity());
 785
 786     if (!bbox) {
 787         desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE, _("<b>Area is not bounded</b>, cannot fill."));
 788         return;
 789     }
 790
 791     double zoom_scale = desktop->current_zoom();
 792
 793     // Render 160% of the physical display to the render pixel buffer, so that available
 794     // fill areas off the screen can be included in the fill.
 795     double padding = 1.6;
 796
 797     Geom::Rect screen = desktop->get_display_area();
 798
 799     unsigned int width = (int)ceil(screen.width() * zoom_scale * padding);
 800     unsigned int height = (int)ceil(screen.height() * zoom_scale * padding);
 801
 802     Geom::Point origin(screen.min()[Geom::X],
 803                        document->getHeight() - screen.height() - screen.min()[Geom::Y]);
 804
 805     origin[Geom::X] = origin[Geom::X] + (screen.width() * ((1 - padding) / 2));
 806     origin[Geom::Y] = origin[Geom::Y] + (screen.height() * ((1 - padding) / 2));
 807
 808     Geom::Scale scale(zoom_scale, zoom_scale);
 809     Geom::Matrix affine = scale * Geom::Translate(-origin * scale);
 810
 811     /* Create ArenaItems and set transform */
 812     NRArenaItem *root = SP_ITEM(document->getRoot())->invoke_show( arena, dkey, SP_ITEM_SHOW_DISPLAY);
 813     nr_arena_item_set_transform(NR_ARENA_ITEM(root), affine);
 814
 815     NRGC gc(NULL);
 816     gc.transform.setIdentity();
 817
 818     NRRectL final_bbox;
 819     final_bbox.x0 = 0;
 820     final_bbox.y0 = 0; //row;
 821     final_bbox.x1 = width;
 822     final_bbox.y1 = height; //row + num_rows;
 823
 824     nr_arena_item_invoke_update(root, &final_bbox, &gc, NR_ARENA_ITEM_STATE_ALL, NR_ARENA_ITEM_STATE_NONE);
 825
 826     guchar *px = g_new(guchar, 4 * width * height);
 827
 828     NRPixBlock B;
 829     nr_pixblock_setup_extern( &B, NR_PIXBLOCK_MODE_R8G8B8A8N,
 830                               final_bbox.x0, final_bbox.y0, final_bbox.x1, final_bbox.y1,
 831                               px, 4 * width, FALSE, FALSE );
 832
 833     SPNamedView *nv = sp_desktop_namedview(desktop);
 834     unsigned long bgcolor = nv->pagecolor;
 835
 836     unsigned char dtc[4];
 837     dtc[0] = NR_RGBA32_R(bgcolor);
 838     dtc[1] = NR_RGBA32_G(bgcolor);
 839     dtc[2] = NR_RGBA32_B(bgcolor);
 840     dtc[3] = NR_RGBA32_A(bgcolor);
 841
 842     for (unsigned int fy = 0; fy < height; fy++) {
 843         guchar *p = NR_PIXBLOCK_PX(&B) + fy * B.rs;
 844         for (unsigned int fx = 0; fx < width; fx++) {
 845             for (int i = 0; i < 4; i++) {
 846                 *p++ = dtc[i];
 847             }
 848         }
 849     }
 850
 851     nr_arena_item_invoke_render(NULL, root, &final_bbox, &B, NR_ARENA_ITEM_RENDER_NO_CACHE );
 852     nr_pixblock_release(&B);
 853
 854     // Hide items
 855     SP_ITEM(document->getRoot())->invoke_hide(dkey);
 856
 857     nr_object_unref((NRObject *) arena);
 858
 859     guchar *trace_px = g_new(guchar, width * height);
 860     memset(trace_px, 0x00, width * height);
 861
 862     std::deque<Geom::Point> fill_queue;
 863     std::queue<Geom::Point> color_queue;
 864
 865     std::vector<Geom::Point> fill_points;
 866
 867     bool aborted = false;
 868     int y_limit = height - 1;
 869
 870     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 871     PaintBucketChannels method = (PaintBucketChannels) prefs->getInt("/tools/paintbucket/channels", 0);
 872     int threshold = prefs->getIntLimited("/tools/paintbucket/threshold", 1, 0, 100);
 873
 874     switch(method) {
 875         case FLOOD_CHANNELS_ALPHA:
 876         case FLOOD_CHANNELS_RGB:
 877         case FLOOD_CHANNELS_R:
 878         case FLOOD_CHANNELS_G:
 879         case FLOOD_CHANNELS_B:
 880             threshold = (255 * threshold) / 100;
 881             break;
 882         case FLOOD_CHANNELS_H:
 883         case FLOOD_CHANNELS_S:
 884         case FLOOD_CHANNELS_L:
 885             break;
 886     }
 887
 888     bitmap_coords_info bci;
 889
 890     bci.y_limit = y_limit;
 891     bci.width = width;
 892     bci.height = height;
 893     bci.threshold = threshold;
 894     bci.method = method;
 895     bci.bbox = *bbox;
 896     bci.screen = screen;
 897     bci.dtc = dtc;
 898     bci.radius = prefs->getIntLimited("/tools/paintbucket/autogap", 0, 0, 3);
 899     bci.max_queue_size = (width * height) / 4;
 900     bci.current_step = 0;
 901
 902     if (is_point_fill) {
 903         fill_points.push_back(Geom::Point(event->button.x, event->button.y));
 904     } else {
 905         Inkscape::Rubberband *r = Inkscape::Rubberband::get(desktop);
 906         fill_points = r->getPoints();
 907     }
 908
 909     for (unsigned int i = 0; i < fill_points.size(); i++) {
 910         Geom::Point pw = Geom::Point(fill_points[i][Geom::X] / zoom_scale, document->getHeight() + (fill_points[i][Geom::Y] / zoom_scale)) * affine;
 911
 912         pw[Geom::X] = (int)MIN(width - 1, MAX(0, pw[Geom::X]));
 913         pw[Geom::Y] = (int)MIN(height - 1, MAX(0, pw[Geom::Y]));
 914
 915         if (is_touch_fill) {
 916             if (i == 0) {
 917                 color_queue.push(pw);
 918             } else {
 919                 unsigned char *trace_t = get_trace_pixel(trace_px, (int)pw[Geom::X], (int)pw[Geom::Y], width);
 920                 push_point_onto_queue(&fill_queue, bci.max_queue_size, trace_t, (int)pw[Geom::X], (int)pw[Geom::Y]);
 921             }
 922         } else {
 923             color_queue.push(pw);
 924         }
 925     }
 926
 927     bool reached_screen_boundary = false;
 928
 929     bool first_run = true;
 930
 931     unsigned long sort_size_threshold = 5;
 932
 933     unsigned int min_y = height;
 934     unsigned int max_y = 0;
 935     unsigned int min_x = width;
 936     unsigned int max_x = 0;
 937
 938     while (!color_queue.empty() && !aborted) {
 939         Geom::Point color_point = color_queue.front();
 940         color_queue.pop();
 941
 942         int cx = (int)color_point[Geom::X];
 943         int cy = (int)color_point[Geom::Y];
 944
 945         unsigned char *orig_px = get_pixel(px, cx, cy, width);
 946         unsigned char orig_color[4];
 947         for (int i = 0; i < 4; i++) { orig_color[i] = orig_px[i]; }
 948
 949         unsigned char merged_orig[3];
 950
 951         merge_pixel_with_background(orig_color, dtc, merged_orig);
 952
 953         bci.merged_orig_pixel = merged_orig;
 954
 955         unsigned char *trace_t = get_trace_pixel(trace_px, cx, cy, width);
 956         if (!is_pixel_checked(trace_t) && !is_pixel_colored(trace_t)) {
 957             if (check_if_pixel_is_paintable(px, trace_px, cx, cy, orig_color, bci)) {
 958                 shift_point_onto_queue(&fill_queue, bci.max_queue_size, trace_t, cx, cy);
 959
 960                 if (!first_run) {
 961                     for (unsigned int y = 0; y < height; y++) {
 962                         trace_t = get_trace_pixel(trace_px, 0, y, width);
 963                         for (unsigned int x = 0; x < width; x++) {
 964                             clear_pixel_paintability(trace_t);
 965                             trace_t++;
 966                         }
 967                     }
 968                 }
 969                 first_run = false;
 970             }
 971         }
 972
 973         unsigned long old_fill_queue_size = fill_queue.size();
 974
 975         while (!fill_queue.empty() && !aborted) {
 976             Geom::Point cp = fill_queue.front();
 977
 978             if (bci.radius == 0) {
 979                 unsigned long new_fill_queue_size = fill_queue.size();
 980
 981                 /*
 982                  * To reduce the number of points in the fill queue, periodically
 983                  * resort all of the points in the queue so that scanline checks
 984                  * can complete more quickly.  A point cannot be checked twice
 985                  * in a normal scanline checks, so forcing scanline checks to start
 986                  * from one corner of the rendered area as often as possible
 987                  * will reduce the number of points that need to be checked and queued.
 988                  */
 989                 if (new_fill_queue_size > sort_size_threshold) {
 990                     if (new_fill_queue_size > old_fill_queue_size) {
 991                         std::sort(fill_queue.begin(), fill_queue.end(), sort_fill_queue_vertical);
 992
 993                         std::deque<Geom::Point>::iterator start_sort = fill_queue.begin();
 994                         std::deque<Geom::Point>::iterator end_sort = fill_queue.begin();
 995                         unsigned int sort_y = (unsigned int)cp[Geom::Y];
 996                         unsigned int current_y = sort_y;
 997
 998                         for (std::deque<Geom::Point>::iterator i = fill_queue.begin(); i != fill_queue.end(); i++) {
 999                             Geom::Point current = *i;
1000                             current_y = (unsigned int)current[Geom::Y];
1001                             if (current_y != sort_y) {
1002                                 if (start_sort != end_sort) {
1003                                     std::sort(start_sort, end_sort, sort_fill_queue_horizontal);
1004                                 }
1005                                 sort_y = current_y;
1006                                 start_sort = i;
1007                             }
1008                             end_sort = i;
1009                         }
1010                         if (start_sort != end_sort) {
1011                             std::sort(start_sort, end_sort, sort_fill_queue_horizontal);
1012                         }
1013
1014                         cp = fill_queue.front();
1015                     }
1016                 }
1017
1018                 old_fill_queue_size = new_fill_queue_size;
1019             }
1020
1021             fill_queue.pop_front();
1022
1023             int x = (int)cp[Geom::X];
1024             int y = (int)cp[Geom::Y];
1025
1026             min_y = MIN((unsigned int)y, min_y);
1027             max_y = MAX((unsigned int)y, max_y);
1028
1029             unsigned char *trace_t = get_trace_pixel(trace_px, x, y, width);
1030             if (!is_pixel_checked(trace_t)) {
1031                 mark_pixel_checked(trace_t);
1032
1033                 if (y == 0) {
1034                     if (bbox->min()[Geom::Y] > screen.min()[Geom::Y]) {
1035                         aborted = true; break;
1036                     } else {
1037                         reached_screen_boundary = true;
1038                     }
1039                 }
1040
1041                 if (y == y_limit) {
1042                     if (bbox->max()[Geom::Y] < screen.max()[Geom::Y]) {
1043                         aborted = true; break;
1044                     } else {
1045                         reached_screen_boundary = true;
1046                     }
1047                 }
1048
1049                 bci.is_left = true;
1050                 bci.x = x;
1051                 bci.y = y;
1052
1053                 ScanlineCheckResult result = perform_bitmap_scanline_check(&fill_queue, px, trace_px, orig_color, bci, &min_x, &max_x);
1054
1055                 switch (result) {
1056                     case SCANLINE_CHECK_ABORTED:
1057                         aborted = true;
1058                         break;
1059                     case SCANLINE_CHECK_BOUNDARY:
1060                         reached_screen_boundary = true;
1061                         break;
1062                     default:
1063                         break;
1064                 }
1065
1066                 if (bci.x < width) {
1067                     trace_t++;
1068                     if (!is_pixel_checked(trace_t) && !is_pixel_queued(trace_t)) {
1069                         mark_pixel_checked(trace_t);
1070                         bci.is_left = false;
1071                         bci.x = x + 1;
1072
1073                         result = perform_bitmap_scanline_check(&fill_queue, px, trace_px, orig_color, bci, &min_x, &max_x);
1074
1075                         switch (result) {
1076                             case SCANLINE_CHECK_ABORTED:
1077                                 aborted = true;
1078                                 break;
1079                             case SCANLINE_CHECK_BOUNDARY:
1080                                 reached_screen_boundary = true;
1081                                 break;
1082                             default:
1083                                 break;
1084                         }
1085                     }
1086                 }
1087             }
1088
1089             bci.current_step++;
1090
1091             if (bci.current_step > bci.max_queue_size) {
1092                 aborted = true;
1093             }
1094         }
1095     }
1096
1097     g_free(px);
1098
1099     if (aborted) {
1100         g_free(trace_px);
1101         desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE, _("<b>Area is not bounded</b>, cannot fill."));
1102         return;
1103     }
1104
1105     if (reached_screen_boundary) {
1106         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."));
1107     }
1108
1109     unsigned int trace_padding = bci.radius + 1;
1110     if (min_y > trace_padding) { min_y -= trace_padding; }
1111     if (max_y < (y_limit - trace_padding)) { max_y += trace_padding; }
1112     if (min_x > trace_padding) { min_x -= trace_padding; }
1113     if (max_x < (width - 1 - trace_padding)) { max_x += trace_padding; }
1114
1115     Geom::Point min_start = Geom::Point(min_x, min_y);
1116
1117     affine = scale * Geom::Translate(-origin * scale - min_start);
1118     Geom::Matrix inverted_affine = Geom::Matrix(affine).inverse();
1119
1120     do_trace(bci, trace_px, desktop, inverted_affine, min_x, max_x, min_y, max_y, union_with_selection);
1121
1122     g_free(trace_px);
1123
1124     DocumentUndo::done(document, SP_VERB_CONTEXT_PAINTBUCKET, _("Fill bounded area"));
1125 }
1126
1127 static gint sp_flood_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
1128 {
1129     gint ret = FALSE;
1130
1131     SPDesktop *desktop = event_context->desktop;
1132
1133     switch (event->type) {
1134     case GDK_BUTTON_PRESS:
1135         if ((event->button.state & GDK_CONTROL_MASK) && event->button.button == 1 && !event_context->space_panning) {
1136             Geom::Point const button_w(event->button.x,
1137                                        event->button.y);
1138
1139             SPItem *item = sp_event_context_find_item (desktop, button_w, TRUE, TRUE);
1140
1141             // Set style
1142             desktop->applyCurrentOrToolStyle(item, "/tools/paintbucket", false);
1143             DocumentUndo::done(sp_desktop_document(desktop), SP_VERB_CONTEXT_PAINTBUCKET, _("Set style on object"));
1144             ret = TRUE;
1145         }
1146         break;
1147     default:
1148         break;
1149     }
1150
1151     if (((SPEventContextClass *) parent_class)->item_handler) {
1152         ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
1153     }
1154
1155     return ret;
1156 }
1157
1158 static gint sp_flood_context_root_handler(SPEventContext *event_context, GdkEvent *event)
1159 {
1160     static bool dragging;
1161
1162     gint ret = FALSE;
1163     SPDesktop *desktop = event_context->desktop;
1164
1165     switch (event->type) {
1166     case GDK_BUTTON_PRESS:
1167         if (event->button.button == 1 && !event_context->space_panning) {
1168             if (!(event->button.state & GDK_CONTROL_MASK)) {
1169                 Geom::Point const button_w(event->button.x,
1170                                            event->button.y);
1171
1172                 if (Inkscape::have_viable_layer(desktop, event_context->defaultMessageContext())) {
1173                     // save drag origin
1174                     event_context->xp = (gint) button_w[Geom::X];
1175                     event_context->yp = (gint) button_w[Geom::Y];
1176                     event_context->within_tolerance = true;
1177
1178                     dragging = true;
1179
1180                     Geom::Point const p(desktop->w2d(button_w));
1181                     Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_TOUCHPATH);
1182                     Inkscape::Rubberband::get(desktop)->start(desktop, p);
1183                 }
1184             }
1185         }
1186     case GDK_MOTION_NOTIFY:
1187         if ( dragging
1188              && ( event->motion.state & GDK_BUTTON1_MASK ) && !event_context->space_panning)
1189         {
1190             if ( event_context->within_tolerance
1191                  && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
1192                  && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
1193                 break; // do not drag if we're within tolerance from origin
1194             }
1195
1196             event_context->within_tolerance = false;
1197
1198             Geom::Point const motion_pt(event->motion.x, event->motion.y);
1199             Geom::Point const p(desktop->w2d(motion_pt));
1200             if (Inkscape::Rubberband::get(desktop)->is_started()) {
1201                 Inkscape::Rubberband::get(desktop)->move(p);
1202                 event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Draw over</b> areas to add to fill, hold <b>Alt</b> for touch fill"));
1203                 gobble_motion_events(GDK_BUTTON1_MASK);
1204             }
1205         }
1206         break;
1207
1208     case GDK_BUTTON_RELEASE:
1209         if (event->button.button == 1 && !event_context->space_panning) {
1210             Inkscape::Rubberband *r = Inkscape::Rubberband::get(desktop);
1211             if (r->is_started()) {
1212                 // set "busy" cursor
1213                 desktop->setWaitingCursor();
1214
1215                 if (SP_IS_EVENT_CONTEXT(event_context)) {
1216                     // Since setWaitingCursor runs main loop iterations, we may have already left this tool!
1217                     // So check if the tool is valid before doing anything
1218                     dragging = false;
1219
1220                     bool is_point_fill = event_context->within_tolerance;
1221                     bool is_touch_fill = event->button.state & GDK_MOD1_MASK;
1222
1223                     sp_flood_do_flood_fill(event_context, event, event->button.state & GDK_SHIFT_MASK, is_point_fill, is_touch_fill);
1224
1225                     desktop->clearWaitingCursor();
1226                     // restore cursor when done; note that it may already be different if e.g. user
1227                     // switched to another tool during interruptible tracing or drawing, in which case do nothing
1228
1229                     ret = TRUE;
1230                 }
1231
1232                 r->stop();
1233
1234                 if (SP_IS_EVENT_CONTEXT(event_context)) {
1235                     event_context->defaultMessageContext()->clear();
1236                 }
1237             }
1238         }
1239         break;
1240     case GDK_KEY_PRESS:
1241         switch (get_group0_keyval (&event->key)) {
1242         case GDK_Up:
1243         case GDK_Down:
1244         case GDK_KP_Up:
1245         case GDK_KP_Down:
1246             // prevent the zoom field from activation
1247             if (!MOD__CTRL_ONLY)
1248                 ret = TRUE;
1249             break;
1250         default:
1251             break;
1252         }
1253         break;
1254     default:
1255         break;
1256     }
1257
1258     if (!ret) {
1259         if (((SPEventContextClass *) parent_class)->root_handler) {
1260             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
1261         }
1262     }
1263
1264     return ret;
1265 }
1266
1267
1268 static void sp_flood_finish(SPFloodContext *rc)
1269 {
1270     rc->_message_context->clear();
1271
1272     if ( rc->item != NULL ) {
1273         SPDesktop * desktop;
1274
1275         desktop = SP_EVENT_CONTEXT_DESKTOP(rc);
1276
1277         SP_OBJECT(rc->item)->updateRepr();
1278
1279         sp_canvas_end_forced_full_redraws(desktop->canvas);
1280
1281         sp_desktop_selection(desktop)->set(rc->item);
1282         DocumentUndo::done(sp_desktop_document(desktop), SP_VERB_CONTEXT_PAINTBUCKET,
1283                         _("Fill bounded area"));
1284
1285         rc->item = NULL;
1286     }
1287 }
1288
1289 void flood_channels_set_channels( gint channels )
1290 {
1291     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1292     prefs->setInt("/tools/paintbucket/channels", channels);
1293 }
1294
1295 /*
1296   Local Variables:
1297   mode:c++
1298   c-file-style:"stroustrup"
1299   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1300   indent-tabs-mode:nil
1301   fill-column:99
1302   End:
1303 */
1304 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :