src/flood-context.cpp

   1 #define __SP_FLOOD_CONTEXT_C__
   2
   3 /*
   4 * Flood fill drawing context
   5 *
   6 * Author:
   7 *   Lauris Kaplinski <lauris@kaplinski.com>
   8 *   bulia byak <buliabyak@users.sf.net>
   9 *   John Bintz <jcoswell@coswellproductions.org>
  10 *
  11 * Copyright (C) 2006      Johan Engelen <johan@shouraizou.nl>
  12 * Copyright (C) 2000-2005 authors
  13 * Copyright (C) 2000-2001 Ximian, Inc.
  14 *
  15 * Released under GNU GPL, read the file 'COPYING' for more information
  16 */
  17
  18 #include "config.h"
  19
  20 #include <gdk/gdkkeysyms.h>
  21 #include <queue>
  22 #include <deque>
  23
  24 #include "macros.h"
  25 #include "display/sp-canvas.h"
  26 #include "document.h"
  27 #include "sp-namedview.h"
  28 #include "sp-object.h"
  29 #include "sp-rect.h"
  30 #include "selection.h"
  31 #include "desktop-handles.h"
  32 #include "desktop.h"
  33 #include "desktop-style.h"
  34 #include "message-stack.h"
  35 #include "message-context.h"
  36 #include "pixmaps/cursor-paintbucket.xpm"
  37 #include "flood-context.h"
  38 #include "sp-metrics.h"
  39 #include <glibmm/i18n.h>
  40 #include "object-edit.h"
  41 #include "xml/repr.h"
  42 #include "xml/node-event-vector.h"
  43 #include "prefs-utils.h"
  44 #include "context-fns.h"
  45 #include "rubberband.h"
  46
  47 #include "display/nr-arena-item.h"
  48 #include "display/nr-arena.h"
  49 #include "display/nr-arena-image.h"
  50 #include "display/canvas-arena.h"
  51 #include "libnr/nr-pixops.h"
  52 #include "libnr/nr-matrix-translate-ops.h"
  53 #include "libnr/nr-scale-ops.h"
  54 #include "libnr/nr-scale-translate-ops.h"
  55 #include "libnr/nr-translate-matrix-ops.h"
  56 #include "libnr/nr-translate-scale-ops.h"
  57 #include "libnr/nr-matrix-ops.h"
  58 #include "sp-item.h"
  59 #include "sp-root.h"
  60 #include "sp-defs.h"
  61 #include "sp-path.h"
  62 #include "splivarot.h"
  63 #include "livarot/Path.h"
  64 #include "livarot/Shape.h"
  65 #include "libnr/n-art-bpath.h"
  66 #include "svg/svg.h"
  67 #include "color.h"
  68
  69 #include "trace/trace.h"
  70 #include "trace/potrace/inkscape-potrace.h"
  71
  72 static void sp_flood_context_class_init(SPFloodContextClass *klass);
  73 static void sp_flood_context_init(SPFloodContext *flood_context);
  74 static void sp_flood_context_dispose(GObject *object);
  75
  76 static void sp_flood_context_setup(SPEventContext *ec);
  77
  78 static gint sp_flood_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  79 static gint sp_flood_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  80
  81 static void sp_flood_finish(SPFloodContext *rc);
  82
  83 static SPEventContextClass *parent_class;
  84
  85
  86 GtkType sp_flood_context_get_type()
  87 {
  88     static GType type = 0;
  89     if (!type) {
  90         GTypeInfo info = {
  91             sizeof(SPFloodContextClass),
  92             NULL, NULL,
  93             (GClassInitFunc) sp_flood_context_class_init,
  94             NULL, NULL,
  95             sizeof(SPFloodContext),
  96             4,
  97             (GInstanceInitFunc) sp_flood_context_init,
  98             NULL,    /* value_table */
  99         };
 100         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPFloodContext", &info, (GTypeFlags) 0);
 101     }
 102     return type;
 103 }
 104
 105 static void sp_flood_context_class_init(SPFloodContextClass *klass)
 106 {
 107     GObjectClass *object_class = (GObjectClass *) klass;
 108     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
 109
 110     parent_class = (SPEventContextClass *) g_type_class_peek_parent(klass);
 111
 112     object_class->dispose = sp_flood_context_dispose;
 113
 114     event_context_class->setup = sp_flood_context_setup;
 115     event_context_class->root_handler  = sp_flood_context_root_handler;
 116     event_context_class->item_handler  = sp_flood_context_item_handler;
 117 }
 118
 119 static void sp_flood_context_init(SPFloodContext *flood_context)
 120 {
 121     SPEventContext *event_context = SP_EVENT_CONTEXT(flood_context);
 122
 123     event_context->cursor_shape = cursor_paintbucket_xpm;
 124     event_context->hot_x = 11;
 125     event_context->hot_y = 30;
 126     event_context->xp = 0;
 127     event_context->yp = 0;
 128     event_context->tolerance = 4;
 129     event_context->within_tolerance = false;
 130     event_context->item_to_select = NULL;
 131
 132     event_context->shape_repr = NULL;
 133     event_context->shape_knot_holder = NULL;
 134
 135     flood_context->item = NULL;
 136
 137     new (&flood_context->sel_changed_connection) sigc::connection();
 138 }
 139
 140 static void sp_flood_context_dispose(GObject *object)
 141 {
 142     SPFloodContext *rc = SP_FLOOD_CONTEXT(object);
 143     SPEventContext *ec = SP_EVENT_CONTEXT(object);
 144
 145     rc->sel_changed_connection.disconnect();
 146     rc->sel_changed_connection.~connection();
 147
 148     /* fixme: This is necessary because we do not grab */
 149     if (rc->item) {
 150         sp_flood_finish(rc);
 151     }
 152
 153     if (ec->shape_repr) { // remove old listener
 154         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 155         Inkscape::GC::release(ec->shape_repr);
 156         ec->shape_repr = 0;
 157     }
 158
 159     if (rc->_message_context) {
 160         delete rc->_message_context;
 161     }
 162
 163     G_OBJECT_CLASS(parent_class)->dispose(object);
 164 }
 165
 166 static Inkscape::XML::NodeEventVector ec_shape_repr_events = {
 167     NULL, /* child_added */
 168     NULL, /* child_removed */
 169     ec_shape_event_attr_changed,
 170     NULL, /* content_changed */
 171     NULL  /* order_changed */
 172 };
 173
 174 /**
 175 \brief  Callback that processes the "changed" signal on the selection;
 176 destroys old and creates new knotholder
 177 */
 178 void sp_flood_context_selection_changed(Inkscape::Selection *selection, gpointer data)
 179 {
 180     SPFloodContext *rc = SP_FLOOD_CONTEXT(data);
 181     SPEventContext *ec = SP_EVENT_CONTEXT(rc);
 182
 183     if (ec->shape_repr) { // remove old listener
 184         sp_repr_remove_listener_by_data(ec->shape_repr, ec);
 185         Inkscape::GC::release(ec->shape_repr);
 186         ec->shape_repr = 0;
 187     }
 188
 189     SPItem *item = selection->singleItem();
 190     if (item) {
 191         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 192         if (shape_repr) {
 193             ec->shape_repr = shape_repr;
 194             Inkscape::GC::anchor(shape_repr);
 195             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 196         }
 197     }
 198 }
 199
 200 static void sp_flood_context_setup(SPEventContext *ec)
 201 {
 202     SPFloodContext *rc = SP_FLOOD_CONTEXT(ec);
 203
 204     if (((SPEventContextClass *) parent_class)->setup) {
 205         ((SPEventContextClass *) parent_class)->setup(ec);
 206     }
 207
 208     SPItem *item = sp_desktop_selection(ec->desktop)->singleItem();
 209     if (item) {
 210         Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
 211         if (shape_repr) {
 212             ec->shape_repr = shape_repr;
 213             Inkscape::GC::anchor(shape_repr);
 214             sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
 215         }
 216     }
 217
 218     rc->sel_changed_connection.disconnect();
 219     rc->sel_changed_connection = sp_desktop_selection(ec->desktop)->connectChanged(
 220         sigc::bind(sigc::ptr_fun(&sp_flood_context_selection_changed), (gpointer)rc)
 221     );
 222
 223     rc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 224 }
 225
 226 inline static void
 227 merge_pixel_with_background (unsigned char *orig, unsigned char *bg,
 228            unsigned char *base)
 229 {
 230     int precalc_bg_alpha = (255 * (255 - bg[3])) / 255;
 231
 232     for (int i = 0; i < 3; i++) {
 233         base[i] = precalc_bg_alpha + (bg[i] * bg[3]) / 255;
 234         base[i] = (base[i] * (255 - orig[3])) / 255 + (orig[i] * orig[3]) / 255;
 235     }
 236 }
 237
 238 inline unsigned char * get_pixel(guchar *px, int x, int y, int width) {
 239     return px + (x + y * width) * 4;
 240 }
 241
 242 GList * flood_channels_dropdown_items_list() {
 243     GList *glist = NULL;
 244
 245     glist = g_list_append (glist, _("Visible Colors"));
 246     glist = g_list_append (glist, _("Red"));
 247     glist = g_list_append (glist, _("Green"));
 248     glist = g_list_append (glist, _("Blue"));
 249     glist = g_list_append (glist, _("Hue"));
 250     glist = g_list_append (glist, _("Saturation"));
 251     glist = g_list_append (glist, _("Lightness"));
 252     glist = g_list_append (glist, _("Alpha"));
 253
 254     return glist;
 255 }
 256
 257 GList * flood_autogap_dropdown_items_list() {
 258     GList *glist = NULL;
 259
 260     glist = g_list_append (glist, _("None"));
 261     glist = g_list_append (glist, _("Small"));
 262     glist = g_list_append (glist, _("Medium"));
 263     glist = g_list_append (glist, _("Large"));
 264
 265     return glist;
 266 }
 267
 268 static bool compare_pixels(unsigned char *check, unsigned char *orig, unsigned char *merged_orig_pixel, unsigned char *dtc, int threshold, PaintBucketChannels method) {
 269     int diff = 0;
 270     float hsl_check[3], hsl_orig[3];
 271
 272     if ((method == FLOOD_CHANNELS_H) ||
 273         (method == FLOOD_CHANNELS_S) ||
 274         (method == FLOOD_CHANNELS_L)) {
 275         sp_color_rgb_to_hsl_floatv(hsl_check, check[0] / 255.0, check[1] / 255.0, check[2] / 255.0);
 276         sp_color_rgb_to_hsl_floatv(hsl_orig, orig[0] / 255.0, orig[1] / 255.0, orig[2] / 255.0);
 277     }
 278
 279     switch (method) {
 280         case FLOOD_CHANNELS_ALPHA:
 281             return ((int)abs(check[3] - orig[3]) <= threshold);
 282         case FLOOD_CHANNELS_R:
 283             return ((int)abs(check[0] - orig[0]) <= threshold);
 284         case FLOOD_CHANNELS_G:
 285             return ((int)abs(check[1] - orig[1]) <= threshold);
 286         case FLOOD_CHANNELS_B:
 287             return ((int)abs(check[2] - orig[2]) <= threshold);
 288         case FLOOD_CHANNELS_RGB:
 289             unsigned char merged_check[3];
 290
 291             merge_pixel_with_background(check, dtc, merged_check);
 292
 293             for (int i = 0; i < 3; i++) {
 294               diff += (int)abs(merged_check[i] - merged_orig_pixel[i]);
 295             }
 296             return ((diff / 3) <= ((threshold * 3) / 4));
 297
 298         case FLOOD_CHANNELS_H:
 299             return ((int)(fabs(hsl_check[0] - hsl_orig[0]) * 100.0) <= threshold);
 300         case FLOOD_CHANNELS_S:
 301             return ((int)(fabs(hsl_check[1] - hsl_orig[1]) * 100.0) <= threshold);
 302         case FLOOD_CHANNELS_L:
 303             return ((int)(fabs(hsl_check[2] - hsl_orig[2]) * 100.0) <= threshold);
 304     }
 305
 306     return false;
 307 }
 308
 309 static inline bool is_pixel_checked(unsigned char *t) { return t[0] == 1; }
 310 static inline bool is_pixel_queued(unsigned char *t) { return t[1] == 1; }
 311 static inline bool is_pixel_paintability_checked(unsigned char *t) { return t[2] != 0; }
 312 static inline bool is_pixel_paintable(unsigned char *t) { return t[2] == 1; }
 313 static inline bool is_pixel_colored(unsigned char *t) { return t[3] == 255; }
 314
 315 static inline void mark_pixel_checked(unsigned char *t) { t[0] = 1; }
 316 static inline void mark_pixel_unchecked(unsigned char *t) { t[0] = 0; }
 317 static inline void mark_pixel_queued(unsigned char *t) { t[1] = 1; }
 318 static inline void mark_pixel_paintable(unsigned char *t) { t[2] = 1; }
 319 static inline void mark_pixel_not_paintable(unsigned char *t) { t[2] = 2; }
 320 static inline void mark_pixel_colored(unsigned char *t) { t[3] = 255; }
 321
 322 static inline void clear_pixel_paintability(unsigned char *t) { t[2] = 0; }
 323
 324 struct bitmap_coords_info {
 325     bool is_left;
 326     unsigned int x;
 327     unsigned int y;
 328     int y_limit;
 329     unsigned int width;
 330     unsigned int height;
 331     unsigned int threshold;
 332     unsigned int radius;
 333     PaintBucketChannels method;
 334     unsigned char *dtc;
 335     unsigned char *merged_orig_pixel;
 336     NR::Rect bbox;
 337     NR::Rect screen;
 338     unsigned int max_queue_size;
 339 };
 340
 341 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) {
 342     if (is_pixel_paintability_checked(trace_t)) {
 343         return is_pixel_paintable(trace_t);
 344     } else {
 345         unsigned char *t = get_pixel(px, x, y, bci.width);
 346         if (compare_pixels(t, orig_color, bci.merged_orig_pixel, bci.dtc, bci.threshold, bci.method)) {
 347             mark_pixel_paintable(trace_t);
 348             return true;
 349         } else {
 350             mark_pixel_not_paintable(trace_t);
 351             return false;
 352         }
 353     }
 354 }
 355
 356 static void do_trace(GdkPixbuf *px, SPDesktop *desktop, NR::Matrix transform, bool union_with_selection) {
 357     SPDocument *document = sp_desktop_document(desktop);
 358
 359     Inkscape::Trace::Potrace::PotraceTracingEngine pte;
 360
 361     pte.setTraceType(Inkscape::Trace::Potrace::TRACE_BRIGHTNESS);
 362     pte.setInvert(false);
 363
 364     Glib::RefPtr<Gdk::Pixbuf> pixbuf = Glib::wrap(px, true);
 365
 366     std::vector<Inkscape::Trace::TracingEngineResult> results = pte.trace(pixbuf);
 367
 368     Inkscape::XML::Node *layer_repr = SP_GROUP(desktop->currentLayer())->repr;
 369     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
 370
 371     long totalNodeCount = 0L;
 372
 373     double offset = prefs_get_double_attribute("tools.paintbucket", "offset", 0.0);
 374
 375     for (unsigned int i=0 ; i<results.size() ; i++) {
 376         Inkscape::Trace::TracingEngineResult result = results[i];
 377         totalNodeCount += result.getNodeCount();
 378
 379         Inkscape::XML::Node *pathRepr = xml_doc->createElement("svg:path");
 380         /* Set style */
 381         sp_desktop_apply_style_tool (desktop, pathRepr, "tools.paintbucket", false);
 382
 383         NArtBpath *bpath = sp_svg_read_path(result.getPathData().c_str());
 384         Path *path = bpath_to_Path(bpath);
 385         g_free(bpath);
 386
 387         if (offset != 0) {
 388
 389             Shape *path_shape = new Shape();
 390
 391             path->ConvertWithBackData(0.03);
 392             path->Fill(path_shape, 0);
 393             delete path;
 394
 395             Shape *expanded_path_shape = new Shape();
 396
 397             expanded_path_shape->ConvertToShape(path_shape, fill_nonZero);
 398             path_shape->MakeOffset(expanded_path_shape, offset * desktop->current_zoom(), join_round, 4);
 399             expanded_path_shape->ConvertToShape(path_shape, fill_positive);
 400
 401             Path *expanded_path = new Path();
 402
 403             expanded_path->Reset();
 404             expanded_path_shape->ConvertToForme(expanded_path);
 405             expanded_path->ConvertEvenLines(1.0);
 406             expanded_path->Simplify(1.0);
 407
 408             delete path_shape;
 409             delete expanded_path_shape;
 410
 411             gchar *str = expanded_path->svg_dump_path();
 412             if (str && *str) {
 413                 pathRepr->setAttribute("d", str);
 414                 g_free(str);
 415             } else {
 416                 desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE, _("<b>Too much inset</b>, the result is empty."));
 417                 Inkscape::GC::release(pathRepr);
 418                 g_free(str);
 419                 return;
 420             }
 421
 422             delete expanded_path;
 423
 424         } else {
 425             gchar *str = path->svg_dump_path();
 426             delete path;
 427             pathRepr->setAttribute("d", str);
 428             g_free(str);
 429         }
 430
 431         layer_repr->addChild(pathRepr, NULL);
 432
 433         SPObject *reprobj = document->getObjectByRepr(pathRepr);
 434         if (reprobj) {
 435             sp_item_write_transform(SP_ITEM(reprobj), pathRepr, transform, NULL);
 436
 437             // premultiply the item transform by the accumulated parent transform in the paste layer
 438             NR::Matrix local = sp_item_i2doc_affine(SP_GROUP(desktop->currentLayer()));
 439             if (!local.test_identity()) {
 440                 gchar const *t_str = pathRepr->attribute("transform");
 441                 NR::Matrix item_t (NR::identity());
 442                 if (t_str)
 443                     sp_svg_transform_read(t_str, &item_t);
 444                 item_t *= local.inverse();
 445                 // (we're dealing with unattached repr, so we write to its attr instead of using sp_item_set_transform)
 446                 gchar *affinestr=sp_svg_transform_write(item_t);
 447                 pathRepr->setAttribute("transform", affinestr);
 448                 g_free(affinestr);
 449             }
 450
 451             Inkscape::Selection *selection = sp_desktop_selection(desktop);
 452
 453             pathRepr->setPosition(-1);
 454
 455             if (union_with_selection) {
 456                 desktop->messageStack()->flashF(Inkscape::WARNING_MESSAGE, _("Area filled, path with <b>%d</b> nodes created and unioned with selection."), sp_nodes_in_path(SP_PATH(reprobj)));
 457                 selection->add(reprobj);
 458                 sp_selected_path_union_skip_undo();
 459             } else {
 460                 desktop->messageStack()->flashF(Inkscape::WARNING_MESSAGE, _("Area filled, path with <b>%d</b> nodes created."), sp_nodes_in_path(SP_PATH(reprobj)));
 461                 selection->set(reprobj);
 462             }
 463
 464         }
 465
 466         Inkscape::GC::release(pathRepr);
 467
 468     }
 469 }
 470
 471 enum ScanlineCheckResult {
 472     SCANLINE_CHECK_OK,
 473     SCANLINE_CHECK_ABORTED,
 474     SCANLINE_CHECK_BOUNDARY
 475 };
 476
 477 static bool coords_in_range(unsigned int x, unsigned int y, bitmap_coords_info bci) {
 478     return (x < bci.width) &&
 479            (y < bci.height);
 480 }
 481
 482 #define PAINT_DIRECTION_LEFT 1
 483 #define PAINT_DIRECTION_RIGHT 2
 484 #define PAINT_DIRECTION_UP 4
 485 #define PAINT_DIRECTION_DOWN 8
 486 #define PAINT_DIRECTION_ALL 15
 487
 488 static unsigned int paint_pixel(guchar *px, guchar *trace_px, unsigned char *orig_color, bitmap_coords_info bci, unsigned char *original_point_trace_t) {
 489     if (bci.radius == 0) {
 490         mark_pixel_colored(original_point_trace_t);
 491         return PAINT_DIRECTION_ALL;
 492     } else {
 493         unsigned char *trace_t;
 494
 495         bool can_paint_up = true;
 496         bool can_paint_down = true;
 497         bool can_paint_left = true;
 498         bool can_paint_right = true;
 499
 500         for (int y = -bci.radius; y <= (int)bci.radius; y++) {
 501             int ty = bci.y + y;
 502             for (int x = -bci.radius; x <= (int)bci.radius; x++) {
 503                 int tx = bci.x + x;
 504
 505                 if (coords_in_range(tx, ty, bci)) {
 506                     trace_t = get_pixel(trace_px, tx, ty, bci.width);
 507                     if (!is_pixel_colored(trace_t)) {
 508                         if (check_if_pixel_is_paintable(px, trace_t, tx, ty, orig_color, bci)) {
 509                             mark_pixel_colored(trace_t);
 510                         } else {
 511                             if (x < 0) { can_paint_left = false; }
 512                             if (x > 0) { can_paint_right = false; }
 513                             if (y < 0) { can_paint_up = false; }
 514                             if (y > 0) { can_paint_down = false; }
 515                         }
 516                     }
 517                 }
 518             }
 519         }
 520
 521         unsigned int paint_directions = 0;
 522         if (can_paint_left) { paint_directions += PAINT_DIRECTION_LEFT; }
 523         if (can_paint_right) { paint_directions += PAINT_DIRECTION_RIGHT; }
 524         if (can_paint_up) { paint_directions += PAINT_DIRECTION_UP; }
 525         if (can_paint_down) { paint_directions += PAINT_DIRECTION_DOWN; }
 526
 527         return paint_directions;
 528     }
 529 }
 530
 531 static ScanlineCheckResult perform_bitmap_scanline_check(std::deque<NR::Point> *fill_queue, guchar *px, guchar *trace_px, unsigned char *orig_color, bitmap_coords_info bci) {
 532     bool aborted = false;
 533     bool reached_screen_boundary = false;
 534     bool ok;
 535
 536     bool keep_tracing;
 537     bool initial_paint = true;
 538
 539     unsigned char *current_trace_t = get_pixel(trace_px, bci.x, bci.y, bci.width);
 540     unsigned int paint_directions;
 541
 542     bool currently_painting_top = false;
 543     bool currently_painting_bottom = false;
 544
 545     unsigned int pix_width = bci.width * 4;
 546
 547     do {
 548         ok = false;
 549         if (bci.is_left) {
 550             keep_tracing = (bci.x != 0);
 551         } else {
 552             keep_tracing = (bci.x < bci.width);
 553         }
 554
 555         if (keep_tracing) {
 556             if (check_if_pixel_is_paintable(px, current_trace_t, bci.x, bci.y, orig_color, bci)) {
 557                 paint_directions = paint_pixel(px, trace_px, orig_color, bci, current_trace_t);
 558                 if (bci.radius == 0) {
 559                     mark_pixel_checked(current_trace_t);
 560                 }
 561
 562                 if (paint_directions & PAINT_DIRECTION_UP) {
 563                     unsigned int ty = bci.y - 1;
 564                     if (ty > 0) {
 565                         unsigned char *trace_t = current_trace_t - pix_width;
 566                         if (!is_pixel_queued(trace_t)) {
 567                             bool ok_to_paint = check_if_pixel_is_paintable(px, trace_t, bci.x, ty, orig_color, bci);
 568
 569                             if (initial_paint) { currently_painting_top = !ok_to_paint; }
 570
 571                             if (ok_to_paint && (!currently_painting_top)) {
 572                                 currently_painting_top = true;
 573                                 if ((fill_queue->size() < bci.max_queue_size)) {
 574                                     fill_queue->push_back(NR::Point(bci.x, ty));
 575                                     mark_pixel_queued(trace_t);
 576                                 }
 577                             }
 578                             if ((!ok_to_paint) && currently_painting_top) {
 579                                 currently_painting_top = false;
 580                             }
 581                         }
 582                     }
 583                 }
 584
 585                 if (paint_directions & PAINT_DIRECTION_DOWN) {
 586                     unsigned int ty = bci.y + 1;
 587                     if (ty < bci.height) {
 588                         unsigned char *trace_t = current_trace_t + pix_width;
 589                         if (!is_pixel_queued(trace_t)) {
 590                             bool ok_to_paint = check_if_pixel_is_paintable(px, trace_t, bci.x, ty, orig_color, bci);
 591
 592                             if (initial_paint) { currently_painting_bottom = !ok_to_paint; }
 593
 594                             if (ok_to_paint && (!currently_painting_bottom)) {
 595                                 currently_painting_bottom = true;
 596                                 if ((fill_queue->size() < bci.max_queue_size)) {
 597                                     fill_queue->push_back(NR::Point(bci.x, ty));
 598                                     mark_pixel_queued(trace_t);
 599                                 }
 600                             }
 601                             if ((!ok_to_paint) && currently_painting_bottom) {
 602                                 currently_painting_bottom = false;
 603                             }
 604                         }
 605                     }
 606                 }
 607
 608                 if (bci.is_left) {
 609                     if (paint_directions & PAINT_DIRECTION_LEFT) {
 610                         bci.x -= 1; current_trace_t -= 4;
 611                         ok = true;
 612                     }
 613                 } else {
 614                     if (paint_directions & PAINT_DIRECTION_RIGHT) {
 615                         bci.x += 1; current_trace_t += 4;
 616                         ok = true;
 617                     }
 618                 }
 619
 620                 initial_paint = false;
 621             }
 622         } else {
 623             if (bci.bbox.min()[NR::X] > bci.screen.min()[NR::X]) {
 624                 aborted = true; break;
 625             } else {
 626                 reached_screen_boundary = true;
 627             }
 628         }
 629     } while (ok);
 630
 631     if (aborted) { return SCANLINE_CHECK_ABORTED; }
 632     if (reached_screen_boundary) { return SCANLINE_CHECK_BOUNDARY; }
 633     return SCANLINE_CHECK_OK;
 634 }
 635
 636 static void sp_flood_do_flood_fill(SPEventContext *event_context, GdkEvent *event, bool union_with_selection, bool is_point_fill, bool is_touch_fill) {
 637     SPDesktop *desktop = event_context->desktop;
 638     SPDocument *document = sp_desktop_document(desktop);
 639
 640     /* Create new arena */
 641     NRArena *arena = NRArena::create();
 642     unsigned dkey = sp_item_display_key_new(1);
 643
 644     sp_document_ensure_up_to_date (document);
 645
 646     SPItem *document_root = SP_ITEM(SP_DOCUMENT_ROOT(document));
 647     NR::Maybe<NR::Rect> bbox = document_root->getBounds(NR::identity());
 648
 649     if (!bbox) {
 650         desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE, _("<b>Area is not bounded</b>, cannot fill."));
 651         return;
 652     }
 653
 654     double zoom_scale = desktop->current_zoom();
 655     double padding = 1.6;
 656
 657     NR::Rect screen = desktop->get_display_area();
 658
 659     unsigned int width = (int)ceil(screen.extent(NR::X) * zoom_scale * padding);
 660     unsigned int height = (int)ceil(screen.extent(NR::Y) * zoom_scale * padding);
 661
 662     NR::Point origin(screen.min()[NR::X],
 663                      sp_document_height(document) - screen.extent(NR::Y) - screen.min()[NR::Y]);
 664
 665     origin[NR::X] = origin[NR::X] + (screen.extent(NR::X) * ((1 - padding) / 2));
 666     origin[NR::Y] = origin[NR::Y] + (screen.extent(NR::Y) * ((1 - padding) / 2));
 667
 668     NR::scale scale(zoom_scale, zoom_scale);
 669     NR::Matrix affine = scale * NR::translate(-origin * scale);
 670
 671     /* Create ArenaItems and set transform */
 672     NRArenaItem *root = sp_item_invoke_show(SP_ITEM(sp_document_root(document)), arena, dkey, SP_ITEM_SHOW_DISPLAY);
 673     nr_arena_item_set_transform(NR_ARENA_ITEM(root), affine);
 674
 675     NRGC gc(NULL);
 676     nr_matrix_set_identity(&gc.transform);
 677
 678     NRRectL final_bbox;
 679     final_bbox.x0 = 0;
 680     final_bbox.y0 = 0;//row;
 681     final_bbox.x1 = width;
 682     final_bbox.y1 = height;//row + num_rows;
 683
 684     nr_arena_item_invoke_update(root, &final_bbox, &gc, NR_ARENA_ITEM_STATE_ALL, NR_ARENA_ITEM_STATE_NONE);
 685
 686     guchar *px = g_new(guchar, 4 * width * height);
 687
 688     NRPixBlock B;
 689     nr_pixblock_setup_extern( &B, NR_PIXBLOCK_MODE_R8G8B8A8N,
 690                               final_bbox.x0, final_bbox.y0, final_bbox.x1, final_bbox.y1,
 691                               px, 4 * width, FALSE, FALSE );
 692
 693     SPNamedView *nv = sp_desktop_namedview(desktop);
 694     unsigned long bgcolor = nv->pagecolor;
 695
 696     unsigned char dtc[4];
 697     dtc[0] = NR_RGBA32_R(bgcolor);
 698     dtc[1] = NR_RGBA32_G(bgcolor);
 699     dtc[2] = NR_RGBA32_B(bgcolor);
 700     dtc[3] = NR_RGBA32_A(bgcolor);
 701
 702     for (unsigned int fy = 0; fy < height; fy++) {
 703         guchar *p = NR_PIXBLOCK_PX(&B) + fy * B.rs;
 704         for (unsigned int fx = 0; fx < width; fx++) {
 705             for (int i = 0; i < 4; i++) {
 706                 *p++ = dtc[i];
 707             }
 708         }
 709     }
 710
 711     nr_arena_item_invoke_render(NULL, root, &final_bbox, &B, NR_ARENA_ITEM_RENDER_NO_CACHE );
 712     nr_pixblock_release(&B);
 713
 714     // Hide items
 715     sp_item_invoke_hide(SP_ITEM(sp_document_root(document)), dkey);
 716
 717     nr_arena_item_unref(root);
 718     nr_object_unref((NRObject *) arena);
 719
 720     guchar *trace_px = g_new(guchar, 4 * width * height);
 721     memset(trace_px, 0x00, 4 * width * height);
 722
 723     std::deque<NR::Point> fill_queue;
 724     std::queue<NR::Point> color_queue;
 725
 726     std::vector<NR::Point> fill_points;
 727
 728     if (is_point_fill) {
 729         fill_points.push_back(NR::Point(event->button.x, event->button.y));
 730     } else {
 731         Inkscape::Rubberband::Rubberband *r = Inkscape::Rubberband::get();
 732         fill_points = r->getPoints();
 733     }
 734
 735     for (unsigned int i = 0; i < fill_points.size(); i++) {
 736         NR::Point pw = NR::Point(fill_points[i][NR::X] / zoom_scale, sp_document_height(document) + (fill_points[i][NR::Y] / zoom_scale)) * affine;
 737
 738         pw[NR::X] = (int)MIN(width - 1, MAX(0, pw[NR::X]));
 739         pw[NR::Y] = (int)MIN(height - 1, MAX(0, pw[NR::Y]));
 740
 741         if (is_touch_fill) {
 742             if (i == 0) {
 743                 color_queue.push(pw);
 744             } else {
 745                 fill_queue.push_back(pw);
 746             }
 747         } else {
 748             color_queue.push(pw);
 749         }
 750     }
 751
 752     bool aborted = false;
 753     int y_limit = height - 1;
 754
 755     PaintBucketChannels method = (PaintBucketChannels)prefs_get_int_attribute("tools.paintbucket", "channels", 0);
 756     int threshold = prefs_get_int_attribute_limited("tools.paintbucket", "threshold", 1, 0, 100);
 757
 758     switch(method) {
 759         case FLOOD_CHANNELS_ALPHA:
 760         case FLOOD_CHANNELS_RGB:
 761         case FLOOD_CHANNELS_R:
 762         case FLOOD_CHANNELS_G:
 763         case FLOOD_CHANNELS_B:
 764             threshold = (255 * threshold) / 100;
 765             break;
 766         case FLOOD_CHANNELS_H:
 767         case FLOOD_CHANNELS_S:
 768         case FLOOD_CHANNELS_L:
 769             break;
 770       }
 771
 772     bool reached_screen_boundary = false;
 773
 774     bitmap_coords_info bci;
 775
 776     bci.y_limit = y_limit;
 777     bci.width = width;
 778     bci.height = height;
 779     bci.threshold = threshold;
 780     bci.method = method;
 781     bci.bbox = *bbox;
 782     bci.screen = screen;
 783     bci.dtc = dtc;
 784     bci.radius = prefs_get_int_attribute_limited("tools.paintbucket", "autogap", 0, 0, 3);
 785     bci.max_queue_size = width * height;
 786
 787     bool first_run = true;
 788
 789     while (!color_queue.empty() && !aborted) {
 790         NR::Point color_point = color_queue.front();
 791         color_queue.pop();
 792
 793         unsigned char *orig_px = get_pixel(px, (int)color_point[NR::X], (int)color_point[NR::Y], width);
 794         unsigned char orig_color[4];
 795         for (int i = 0; i < 4; i++) { orig_color[i] = orig_px[i]; }
 796
 797         unsigned char merged_orig[3];
 798
 799         merge_pixel_with_background(orig_color, dtc, merged_orig);
 800
 801         bci.merged_orig_pixel = merged_orig;
 802
 803         unsigned char *trace_t = get_pixel(trace_px, (int)color_point[NR::X], (int)color_point[NR::Y], width);
 804         if (!is_pixel_checked(trace_t) && !is_pixel_colored(trace_t)) {
 805             if (check_if_pixel_is_paintable(px, trace_px, (int)color_point[NR::X], (int)color_point[NR::Y], orig_color, bci)) {
 806                 fill_queue.push_front(color_point);
 807
 808                 if (!first_run) {
 809                     for (unsigned int y = 0; y < height; y++) {
 810                         trace_t = get_pixel(trace_px, 0, y, width);
 811                         for (unsigned int x = 0; x < width; x++) {
 812                             clear_pixel_paintability(trace_t);
 813                             trace_t += 4;
 814                         }
 815                     }
 816                 }
 817                 first_run = false;
 818             }
 819         }
 820
 821         while (!fill_queue.empty() && !aborted) {
 822             NR::Point cp = fill_queue.front();
 823             fill_queue.pop_front();
 824
 825             unsigned char *trace_t = get_pixel(trace_px, (int)cp[NR::X], (int)cp[NR::Y], width);
 826             if (!is_pixel_checked(trace_t)) {
 827                 mark_pixel_checked(trace_t);
 828                 int x = (int)cp[NR::X];
 829                 int y = (int)cp[NR::Y];
 830
 831                 if (y == 0) {
 832                     if (bbox->min()[NR::Y] > screen.min()[NR::Y]) {
 833                         aborted = true; break;
 834                     } else {
 835                         reached_screen_boundary = true;
 836                     }
 837                 }
 838
 839                 if (y == y_limit) {
 840                     if (bbox->max()[NR::Y] < screen.max()[NR::Y]) {
 841                         aborted = true; break;
 842                     } else {
 843                         reached_screen_boundary = true;
 844                     }
 845                 }
 846
 847                 bci.is_left = true;
 848                 bci.x = x;
 849                 bci.y = y;
 850
 851                 ScanlineCheckResult result = perform_bitmap_scanline_check(&fill_queue, px, trace_px, orig_color, bci);
 852
 853                 switch (result) {
 854                     case SCANLINE_CHECK_ABORTED:
 855                         aborted = true;
 856                         break;
 857                     case SCANLINE_CHECK_BOUNDARY:
 858                         reached_screen_boundary = true;
 859                         break;
 860                     default:
 861                         break;
 862                 }
 863
 864                 if (bci.x < width) {
 865                     trace_t += 4;
 866                     if (!is_pixel_checked(trace_t) && !is_pixel_queued(trace_t)) {
 867                         mark_pixel_checked(trace_t);
 868                         bci.is_left = false;
 869                         bci.x = x + 1;
 870
 871                         result = perform_bitmap_scanline_check(&fill_queue, px, trace_px, orig_color, bci);
 872
 873                         switch (result) {
 874                             case SCANLINE_CHECK_ABORTED:
 875                                 aborted = true;
 876                                 break;
 877                             case SCANLINE_CHECK_BOUNDARY:
 878                                 reached_screen_boundary = true;
 879                                 break;
 880                             default:
 881                                 break;
 882                         }
 883                     }
 884                 }
 885             }
 886         }
 887     }
 888
 889     g_free(px);
 890
 891     if (aborted) {
 892         g_free(trace_px);
 893         desktop->messageStack()->flash(Inkscape::WARNING_MESSAGE, _("<b>Area is not bounded</b>, cannot fill."));
 894         return;
 895     }
 896
 897     if (reached_screen_boundary) {
 898         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."));
 899     }
 900
 901     GdkPixbuf* pixbuf = gdk_pixbuf_new_from_data(trace_px,
 902                                       GDK_COLORSPACE_RGB,
 903                                       TRUE,
 904                                       8, width, height, width * 4,
 905                                       (GdkPixbufDestroyNotify)g_free,
 906                                       NULL);
 907
 908     NR::Matrix inverted_affine = NR::Matrix(affine).inverse();
 909
 910     do_trace(pixbuf, desktop, inverted_affine, union_with_selection);
 911
 912     g_free(trace_px);
 913
 914     sp_document_done(document, SP_VERB_CONTEXT_PAINTBUCKET, _("Fill bounded area"));
 915 }
 916
 917 static gint sp_flood_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
 918 {
 919     gint ret = FALSE;
 920
 921     SPDesktop *desktop = event_context->desktop;
 922
 923     switch (event->type) {
 924     case GDK_BUTTON_PRESS:
 925         if (event->button.state & GDK_CONTROL_MASK) {
 926             NR::Point const button_w(event->button.x,
 927                                     event->button.y);
 928
 929             SPItem *item = sp_event_context_find_item (desktop, button_w, TRUE, TRUE);
 930
 931             Inkscape::XML::Node *pathRepr = SP_OBJECT_REPR(item);
 932             /* Set style */
 933             sp_desktop_apply_style_tool (desktop, pathRepr, "tools.paintbucket", false);
 934             sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_PAINTBUCKET, _("Set style on object"));
 935             ret = TRUE;
 936         }
 937         break;
 938     default:
 939         break;
 940     }
 941
 942     if (((SPEventContextClass *) parent_class)->item_handler) {
 943         ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
 944     }
 945
 946     return ret;
 947 }
 948
 949 static gint sp_flood_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 950 {
 951     static bool dragging;
 952
 953     gint ret = FALSE;
 954     SPDesktop *desktop = event_context->desktop;
 955
 956     switch (event->type) {
 957     case GDK_BUTTON_PRESS:
 958         if ( event->button.button == 1 ) {
 959             if (!(event->button.state & GDK_CONTROL_MASK)) {
 960                 NR::Point const button_w(event->button.x,
 961                                         event->button.y);
 962
 963                 if (Inkscape::have_viable_layer(desktop, event_context->defaultMessageContext())) {
 964                     // save drag origin
 965                     event_context->xp = (gint) button_w[NR::X];
 966                     event_context->yp = (gint) button_w[NR::Y];
 967                     event_context->within_tolerance = true;
 968
 969                     dragging = true;
 970
 971                     NR::Point const p(desktop->w2d(button_w));
 972                     Inkscape::Rubberband::get()->setMode(RUBBERBAND_MODE_TOUCHPATH);
 973                     Inkscape::Rubberband::get()->start(desktop, p);
 974                 }
 975             }
 976         }
 977     case GDK_MOTION_NOTIFY:
 978         if ( dragging
 979              && ( event->motion.state & GDK_BUTTON1_MASK ) )
 980         {
 981             if ( event_context->within_tolerance
 982                  && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
 983                  && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
 984                 break; // do not drag if we're within tolerance from origin
 985             }
 986
 987             event_context->within_tolerance = false;
 988
 989             NR::Point const motion_pt(event->motion.x, event->motion.y);
 990             NR::Point const p(desktop->w2d(motion_pt));
 991             if (Inkscape::Rubberband::get()->is_started()) {
 992                 Inkscape::Rubberband::get()->move(p);
 993                 event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Draw over</b> areas to add to fill, hold <b>Alt</b> for touch fill"));
 994                 gobble_motion_events(GDK_BUTTON1_MASK);
 995             }
 996         }
 997         break;
 998
 999     case GDK_BUTTON_RELEASE:
1000         if ( event->button.button == 1 ) {
1001             Inkscape::Rubberband::Rubberband *r = Inkscape::Rubberband::get();
1002             if (r->is_started()) {
1003                 // set "busy" cursor
1004                 desktop->setWaitingCursor();
1005
1006                 if (SP_IS_EVENT_CONTEXT(event_context)) {
1007                     // Since setWaitingCursor runs main loop iterations, we may have already left this tool!
1008                     // So check if the tool is valid before doing anything
1009                     dragging = false;
1010
1011                     bool is_point_fill = event_context->within_tolerance;
1012                     bool is_touch_fill = event->button.state & GDK_MOD1_MASK;
1013
1014                     sp_flood_do_flood_fill(event_context, event, event->button.state & GDK_SHIFT_MASK, is_point_fill, is_touch_fill);
1015
1016                     desktop->clearWaitingCursor();
1017                     // restore cursor when done; note that it may already be different if e.g. user
1018                     // switched to another tool during interruptible tracing or drawing, in which case do nothing
1019
1020                     ret = TRUE;
1021                 }
1022
1023                 r->stop();
1024                 event_context->defaultMessageContext()->clear();
1025             }
1026         }
1027         break;
1028     case GDK_KEY_PRESS:
1029         switch (get_group0_keyval (&event->key)) {
1030         case GDK_Up:
1031         case GDK_Down:
1032         case GDK_KP_Up:
1033         case GDK_KP_Down:
1034             // prevent the zoom field from activation
1035             if (!MOD__CTRL_ONLY)
1036                 ret = TRUE;
1037             break;
1038         default:
1039             break;
1040         }
1041         break;
1042     default:
1043         break;
1044     }
1045
1046     if (!ret) {
1047         if (((SPEventContextClass *) parent_class)->root_handler) {
1048             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
1049         }
1050     }
1051
1052     return ret;
1053 }
1054
1055
1056 static void sp_flood_finish(SPFloodContext *rc)
1057 {
1058     rc->_message_context->clear();
1059
1060     if ( rc->item != NULL ) {
1061         SPDesktop * desktop;
1062
1063         desktop = SP_EVENT_CONTEXT_DESKTOP(rc);
1064
1065         SP_OBJECT(rc->item)->updateRepr();
1066
1067         sp_canvas_end_forced_full_redraws(desktop->canvas);
1068
1069         sp_desktop_selection(desktop)->set(rc->item);
1070         sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_PAINTBUCKET,
1071                         _("Fill bounded area"));
1072
1073         rc->item = NULL;
1074     }
1075 }
1076
1077 void flood_channels_set_channels( gint channels )
1078 {
1079     prefs_set_int_attribute("tools.paintbucket", "channels", channels);
1080 }
1081
1082 /*
1083   Local Variables:
1084   mode:c++
1085   c-file-style:"stroustrup"
1086   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1087   indent-tabs-mode:nil
1088   fill-column:99
1089   End:
1090 */
1091 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :