Code

due to the order of processing events, we must disable lmb handling in children conte...
[inkscape.git] / src / flood-context.cpp
index 8a9502843a85b2abe336f8c419702c98e2da72cc..e95274a1036a80e800af458516a397b7aca082b3 100644 (file)
@@ -19,6 +19,7 @@
 
 #include <gdk/gdkkeysyms.h>
 #include <queue>
+#include <deque>
 
 #include "macros.h"
 #include "display/sp-canvas.h"
@@ -27,9 +28,7 @@
 #include "sp-object.h"
 #include "sp-rect.h"
 #include "selection.h"
-#include "selection-chemistry.h"
 #include "desktop-handles.h"
-#include "snap.h"
 #include "desktop.h"
 #include "desktop-style.h"
 #include "message-stack.h"
@@ -50,9 +49,7 @@
 #include "display/nr-arena-image.h"
 #include "display/canvas-arena.h"
 #include "libnr/nr-pixops.h"
-#include "libnr/nr-matrix-rotate-ops.h"
 #include "libnr/nr-matrix-translate-ops.h"
-#include "libnr/nr-rotate-fns.h"
 #include "libnr/nr-scale-ops.h"
 #include "libnr/nr-scale-translate-ops.h"
 #include "libnr/nr-translate-matrix-ops.h"
@@ -128,7 +125,7 @@ static void sp_flood_context_init(SPFloodContext *flood_context)
     event_context->hot_y = 30;
     event_context->xp = 0;
     event_context->yp = 0;
-    event_context->tolerance = 0;
+    event_context->tolerance = 4;
     event_context->within_tolerance = false;
     event_context->item_to_select = NULL;
 
@@ -226,32 +223,22 @@ static void sp_flood_context_setup(SPEventContext *ec)
     rc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 }
 
-static void
+inline static void
 merge_pixel_with_background (unsigned char *orig, unsigned char *bg,
            unsigned char *base)
 {
+    int precalc_bg_alpha = (255 * (255 - bg[3])) / 255;
+    
     for (int i = 0; i < 3; i++) {
-        base[i] = (255 * (255 - bg[3])) / 255 + (bg[i] * bg[3]) / 255;
+        base[i] = precalc_bg_alpha + (bg[i] * bg[3]) / 255;
         base[i] = (base[i] * (255 - orig[3])) / 255 + (orig[i] * orig[3]) / 255;
     }
-    base[3] = 255;
 }
 
 inline unsigned char * get_pixel(guchar *px, int x, int y, int width) {
     return px + (x + y * width) * 4;
 }
 
-enum PaintBucketChannels {
-    FLOOD_CHANNELS_RGB,
-    FLOOD_CHANNELS_R,
-    FLOOD_CHANNELS_G,
-    FLOOD_CHANNELS_B,
-    FLOOD_CHANNELS_H,
-    FLOOD_CHANNELS_S,
-    FLOOD_CHANNELS_L,
-    FLOOD_CHANNELS_ALPHA
-};
-
 GList * flood_channels_dropdown_items_list() {
     GList *glist = NULL;
 
@@ -267,7 +254,18 @@ GList * flood_channels_dropdown_items_list() {
     return glist;
 }
 
-static bool compare_pixels(unsigned char *check, unsigned char *orig, unsigned char *dtc, int threshold, PaintBucketChannels method) {
+GList * flood_autogap_dropdown_items_list() {
+    GList *glist = NULL;
+
+    glist = g_list_append (glist, _("None"));
+    glist = g_list_append (glist, _("Small"));
+    glist = g_list_append (glist, _("Medium"));
+    glist = g_list_append (glist, _("Large"));
+
+    return glist;
+}
+
+static bool compare_pixels(unsigned char *check, unsigned char *orig, unsigned char *merged_orig_pixel, unsigned char *dtc, int threshold, PaintBucketChannels method) {
     int diff = 0;
     float hsl_check[3], hsl_orig[3];
     
@@ -288,14 +286,12 @@ static bool compare_pixels(unsigned char *check, unsigned char *orig, unsigned c
         case FLOOD_CHANNELS_B:
             return ((int)abs(check[2] - orig[2]) <= threshold);
         case FLOOD_CHANNELS_RGB:
-            unsigned char merged_orig[4];
-            unsigned char merged_check[4];
+            unsigned char merged_check[3];
             
-            merge_pixel_with_background(orig, dtc, merged_orig);
             merge_pixel_with_background(check, dtc, merged_check);
             
             for (int i = 0; i < 3; i++) {
-              diff += (int)abs(merged_check[i] - merged_orig[i]);
+              diff += (int)abs(merged_check[i] - merged_orig_pixel[i]);
             }
             return ((diff / 3) <= ((threshold * 3) / 4));
         
@@ -310,19 +306,52 @@ static bool compare_pixels(unsigned char *check, unsigned char *orig, unsigned c
     return false;
 }
 
-static bool try_add_to_queue(std::queue<NR::Point> *fill_queue, guchar *px, guchar *trace_px, unsigned char *orig, unsigned char *dtc, int x, int y, int width, int threshold, PaintBucketChannels method, bool fill_switch) {
-    unsigned char *t = get_pixel(px, x, y, width);
-    if (compare_pixels(t, orig, dtc, threshold, method)) {
-        unsigned char *trace_t = get_pixel(trace_px, x, y, width);
-        if (trace_t[3] != 255 && trace_t[0] != 255) {
-            if (fill_switch) {
-                fill_queue->push(NR::Point(x, y));
-                trace_t[0] = 255;
-            }
+static inline bool is_pixel_checked(unsigned char *t) { return t[0] == 1; }
+static inline bool is_pixel_queued(unsigned char *t) { return t[1] == 1; }
+static inline bool is_pixel_paintability_checked(unsigned char *t) { return t[2] != 0; }
+static inline bool is_pixel_paintable(unsigned char *t) { return t[2] == 1; }
+static inline bool is_pixel_colored(unsigned char *t) { return t[3] == 255; }
+
+static inline void mark_pixel_checked(unsigned char *t) { t[0] = 1; }
+static inline void mark_pixel_unchecked(unsigned char *t) { t[0] = 0; }
+static inline void mark_pixel_queued(unsigned char *t) { t[1] = 1; }
+static inline void mark_pixel_paintable(unsigned char *t) { t[2] = 1; }
+static inline void mark_pixel_not_paintable(unsigned char *t) { t[2] = 2; }
+static inline void mark_pixel_colored(unsigned char *t) { t[3] = 255; }
+
+static inline void clear_pixel_paintability(unsigned char *t) { t[2] = 0; }
+
+struct bitmap_coords_info {
+    bool is_left;
+    unsigned int x;
+    unsigned int y;
+    int y_limit;
+    unsigned int width;
+    unsigned int height;
+    unsigned int threshold;
+    unsigned int radius;
+    PaintBucketChannels method;
+    unsigned char *dtc;
+    unsigned char *merged_orig_pixel;
+    NR::Rect bbox;
+    NR::Rect screen;
+    unsigned int max_queue_size;
+    unsigned int current_step;
+};
+
+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) {
+    if (is_pixel_paintability_checked(trace_t)) {
+        return is_pixel_paintable(trace_t);
+    } else {
+        unsigned char *t = get_pixel(px, x, y, bci.width);
+        if (compare_pixels(t, orig_color, bci.merged_orig_pixel, bci.dtc, bci.threshold, bci.method)) {
+            mark_pixel_paintable(trace_t);
+            return true;
+        } else {
+            mark_pixel_not_paintable(trace_t);
+            return false;
         }
-        return false;
     }
-    return true;
 }
 
 static void do_trace(GdkPixbuf *px, SPDesktop *desktop, NR::Matrix transform, bool union_with_selection) {
@@ -440,61 +469,157 @@ static void do_trace(GdkPixbuf *px, SPDesktop *desktop, NR::Matrix transform, bo
     }
 }
 
-struct bitmap_coords_info {
-    bool is_left;
-    int x;
-    int y;
-    int y_limit;
-    int width;
-    int threshold;
-    PaintBucketChannels method;
-    unsigned char *dtc;
-    bool top_fill;
-    bool bottom_fill;
-    NR::Rect bbox;
-    NR::Rect screen;
-};
-
 enum ScanlineCheckResult {
     SCANLINE_CHECK_OK,
     SCANLINE_CHECK_ABORTED,
     SCANLINE_CHECK_BOUNDARY
 };
 
-static ScanlineCheckResult perform_bitmap_scanline_check(std::queue<NR::Point> *fill_queue, guchar *px, guchar *trace_px, unsigned char *orig_color, bitmap_coords_info bci) {
+inline static bool coords_in_range(unsigned int x, unsigned int y, bitmap_coords_info bci) {
+    return (x < bci.width) &&
+           (y < bci.height);
+}
+
+#define PAINT_DIRECTION_LEFT 1
+#define PAINT_DIRECTION_RIGHT 2
+#define PAINT_DIRECTION_UP 4
+#define PAINT_DIRECTION_DOWN 8
+#define PAINT_DIRECTION_ALL 15
+
+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) {
+    if (bci.radius == 0) {
+        mark_pixel_colored(original_point_trace_t); 
+        return PAINT_DIRECTION_ALL;
+    } else {
+        unsigned char *trace_t;
+  
+        bool can_paint_up = true;
+        bool can_paint_down = true;
+        bool can_paint_left = true;
+        bool can_paint_right = true;
+      
+        for (unsigned int ty = bci.y - bci.radius; ty <= bci.y + bci.radius; ty++) {
+            for (unsigned int tx = bci.x - bci.radius; tx <= bci.x + bci.radius; tx++) {
+                if (coords_in_range(tx, ty, bci)) {
+                    trace_t = get_pixel(trace_px, tx, ty, bci.width);
+                    if (!is_pixel_colored(trace_t)) {
+                        if (check_if_pixel_is_paintable(px, trace_t, tx, ty, orig_color, bci)) {
+                            mark_pixel_colored(trace_t); 
+                        } else {
+                            if (tx < bci.x) { can_paint_left = false; }
+                            if (tx > bci.x) { can_paint_right = false; }
+                            if (ty < bci.y) { can_paint_up = false; }
+                            if (ty > bci.y) { can_paint_down = false; }
+                        }
+                    }
+                }
+            }
+        }
+    
+        unsigned int paint_directions = 0;
+        if (can_paint_left) { paint_directions += PAINT_DIRECTION_LEFT; }
+        if (can_paint_right) { paint_directions += PAINT_DIRECTION_RIGHT; }
+        if (can_paint_up) { paint_directions += PAINT_DIRECTION_UP; }
+        if (can_paint_down) { paint_directions += PAINT_DIRECTION_DOWN; }
+        
+        return paint_directions;
+    }
+}
+
+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) {
     bool aborted = false;
     bool reached_screen_boundary = false;
     bool ok;
   
     bool keep_tracing;
-    unsigned char *t, *trace_t;
-  
+    bool initial_paint = true;
+    
+    unsigned char *current_trace_t = get_pixel(trace_px, bci.x, bci.y, bci.width);
+    unsigned int paint_directions;
+    
+    bool currently_painting_top = false;
+    bool currently_painting_bottom = false;
+    
+    unsigned int pix_width = bci.width * 4;
+    
+    unsigned int top_ty = bci.y - 1;
+    unsigned int bottom_ty = bci.y + 1;
+    
+    bool can_paint_top = (top_ty > 0);
+    bool can_paint_bottom = (bottom_ty < bci.height);
+    
     do {
         ok = false;
         if (bci.is_left) {
-            keep_tracing = (bci.x >= 0);
+            keep_tracing = (bci.x != 0);
         } else {
             keep_tracing = (bci.x < bci.width);
         }
         
         if (keep_tracing) {
-            t = get_pixel(px, bci.x, bci.y, bci.width);
-            if (compare_pixels(t, orig_color, bci.dtc, bci.threshold, bci.method)) {
-                for (int i = 0; i < 4; i++) { t[i] = 255 - t[i]; }
-                trace_t = get_pixel(trace_px, bci.x, bci.y, bci.width);
-                trace_t[3] = 255; 
-                if (bci.y > 0) { 
-                    bci.top_fill = try_add_to_queue(fill_queue, px, trace_px, orig_color, bci.dtc, bci.x, bci.y - 1, bci.width, bci.threshold, bci.method, bci.top_fill);
+            if (check_if_pixel_is_paintable(px, current_trace_t, bci.x, bci.y, orig_color, bci)) {
+                paint_directions = paint_pixel(px, trace_px, orig_color, bci, current_trace_t);
+                if (bci.radius == 0) {
+                    mark_pixel_checked(current_trace_t);
                 }
-                if (bci.y < bci.y_limit) { 
-                    bci.bottom_fill = try_add_to_queue(fill_queue, px, trace_px, orig_color, bci.dtc, bci.x, bci.y + 1, bci.width, bci.threshold, bci.method, bci.bottom_fill);
+                
+                if (can_paint_top) {
+                    if (paint_directions & PAINT_DIRECTION_UP) { 
+                        unsigned char *trace_t = current_trace_t - pix_width;
+                        if (!is_pixel_queued(trace_t)) {
+                            bool ok_to_paint = check_if_pixel_is_paintable(px, trace_t, bci.x, top_ty, orig_color, bci);
+                            
+                            if (initial_paint) { currently_painting_top = !ok_to_paint; }
+                            
+                            if (ok_to_paint && (!currently_painting_top)) {
+                                currently_painting_top = true;
+                                if ((fill_queue->size() < bci.max_queue_size)) {
+                                    fill_queue->push_back(NR::Point(bci.x, top_ty));
+                                    mark_pixel_queued(trace_t);
+                                }
+                            }
+                            if ((!ok_to_paint) && currently_painting_top) {
+                                currently_painting_top = false;
+                            }
+                        }
+                    }
                 }
+                
+                if (can_paint_bottom) {
+                    if (paint_directions & PAINT_DIRECTION_DOWN) { 
+                        unsigned char *trace_t = current_trace_t + pix_width;
+                        if (!is_pixel_queued(trace_t)) {
+                            bool ok_to_paint = check_if_pixel_is_paintable(px, trace_t, bci.x, bottom_ty, orig_color, bci);
+                            
+                            if (initial_paint) { currently_painting_bottom = !ok_to_paint; }
+                            
+                            if (ok_to_paint && (!currently_painting_bottom)) {
+                                currently_painting_bottom = true;
+                                if ((fill_queue->size() < bci.max_queue_size)) {
+                                    fill_queue->push_back(NR::Point(bci.x, bottom_ty));
+                                    mark_pixel_queued(trace_t);
+                                }
+                            }
+                            if ((!ok_to_paint) && currently_painting_bottom) {
+                                currently_painting_bottom = false;
+                            }
+                        }
+                    }
+                }
+                
                 if (bci.is_left) {
-                    bci.x--;
+                    if (paint_directions & PAINT_DIRECTION_LEFT) {
+                        bci.x -= 1; current_trace_t -= 4;
+                        ok = true;
+                    }
                 } else {
-                    bci.x++;
+                    if (paint_directions & PAINT_DIRECTION_RIGHT) {
+                        bci.x += 1; current_trace_t += 4;
+                        ok = true;
+                    }
                 }
-                ok = true;
+                
+                initial_paint = false;
             }
         } else {
             if (bci.bbox.min()[NR::X] > bci.screen.min()[NR::X]) {
@@ -510,7 +635,7 @@ static ScanlineCheckResult perform_bitmap_scanline_check(std::queue<NR::Point> *
     return SCANLINE_CHECK_OK;
 }
 
-static void sp_flood_do_flood_fill(SPEventContext *event_context, GdkEvent *event, bool union_with_selection, bool use_rubberband_points) {
+static void sp_flood_do_flood_fill(SPEventContext *event_context, GdkEvent *event, bool union_with_selection, bool is_point_fill, bool is_touch_fill) {
     SPDesktop *desktop = event_context->desktop;
     SPDocument *document = sp_desktop_document(desktop);
 
@@ -533,8 +658,8 @@ static void sp_flood_do_flood_fill(SPEventContext *event_context, GdkEvent *even
 
     NR::Rect screen = desktop->get_display_area();
 
-    int width = (int)ceil(screen.extent(NR::X) * zoom_scale * padding);
-    int height = (int)ceil(screen.extent(NR::Y) * zoom_scale * padding);
+    unsigned int width = (int)ceil(screen.extent(NR::X) * zoom_scale * padding);
+    unsigned int height = (int)ceil(screen.extent(NR::Y) * zoom_scale * padding);
 
     NR::Point origin(screen.min()[NR::X],
                      sp_document_height(document) - screen.extent(NR::Y) - screen.min()[NR::Y]);
@@ -561,7 +686,6 @@ static void sp_flood_do_flood_fill(SPEventContext *event_context, GdkEvent *even
     nr_arena_item_invoke_update(root, &final_bbox, &gc, NR_ARENA_ITEM_STATE_ALL, NR_ARENA_ITEM_STATE_NONE);
 
     guchar *px = g_new(guchar, 4 * width * height);
-    //memset(px, 0x00, 4 * width * height);
     
     NRPixBlock B;
     nr_pixblock_setup_extern( &B, NR_PIXBLOCK_MODE_R8G8B8A8N,
@@ -577,14 +701,14 @@ static void sp_flood_do_flood_fill(SPEventContext *event_context, GdkEvent *even
     dtc[2] = NR_RGBA32_B(bgcolor);
     dtc[3] = NR_RGBA32_A(bgcolor);
     
-    for (int fy = 0; fy < height; fy++) {
+    for (unsigned int fy = 0; fy < height; fy++) {
         guchar *p = NR_PIXBLOCK_PX(&B) + fy * B.rs;
-        for (int fx = 0; fx < width; fx++) {
+        for (unsigned int fx = 0; fx < width; fx++) {
             for (int i = 0; i < 4; i++) { 
                 *p++ = dtc[i];
             }
-          }
-      }
+        }
+    }
 
     nr_arena_item_invoke_render(NULL, root, &final_bbox, &B, NR_ARENA_ITEM_RENDER_NO_CACHE );
     nr_pixblock_release(&B);
@@ -598,40 +722,38 @@ static void sp_flood_do_flood_fill(SPEventContext *event_context, GdkEvent *even
     guchar *trace_px = g_new(guchar, 4 * width * height);
     memset(trace_px, 0x00, 4 * width * height);
     
-    std::queue<NR::Point> fill_queue;
-    
+    std::deque<NR::Point> fill_queue;
+    std::queue<NR::Point> color_queue;
     
-    std::vector<NR::Point> points;
+    std::vector<NR::Point> fill_points;
     
-    if (use_rubberband_points) {
-        Inkscape::Rubberband::Rubberband *r = Inkscape::Rubberband::get();
-        points = r->getPoints();
+    if (is_point_fill) {
+        fill_points.push_back(NR::Point(event->button.x, event->button.y));
     } else {
-        points.push_back(NR::Point(event->button.x, event->button.y));
+        Inkscape::Rubberband::Rubberband *r = Inkscape::Rubberband::get();
+        fill_points = r->getPoints();
     }
 
-    for (unsigned int i = 0; i < points.size(); i++) {
-        NR::Point pw = NR::Point(points[i][NR::X] / zoom_scale, sp_document_height(document) + (points[i][NR::Y] / zoom_scale)) * affine;
+    for (unsigned int i = 0; i < fill_points.size(); i++) {
+        NR::Point pw = NR::Point(fill_points[i][NR::X] / zoom_scale, sp_document_height(document) + (fill_points[i][NR::Y] / zoom_scale)) * affine;
         
         pw[NR::X] = (int)MIN(width - 1, MAX(0, pw[NR::X]));
         pw[NR::Y] = (int)MIN(height - 1, MAX(0, pw[NR::Y]));
         
-        fill_queue.push(pw);
+        if (is_touch_fill) {
+            if (i == 0) {
+                color_queue.push(pw);
+            } else {
+                fill_queue.push_back(pw);
+            }
+        } else {
+            color_queue.push(pw);
+        }
     }
 
-    NR::Point first_point = NR::Point(points[0][NR::X] / zoom_scale, sp_document_height(document) + (points[0][NR::Y] / zoom_scale)) * affine;
-    
-    unsigned char *orig_px  = get_pixel(px, (int)first_point[NR::X], (int)first_point[NR::Y], width);
-    unsigned char orig_color[4];
-    for (int i = 0; i < 4; i++) { orig_color[i] = orig_px[i]; }
-    
     bool aborted = false;
     int y_limit = height - 1;
 
-    unsigned char merged_orig[4];
-
-    merge_pixel_with_background(orig_color, dtc, merged_orig);
-    
     PaintBucketChannels method = (PaintBucketChannels)prefs_get_int_attribute("tools.paintbucket", "channels", 0);
     int threshold = prefs_get_int_attribute_limited("tools.paintbucket", "threshold", 1, 0, 100);
 
@@ -655,80 +777,124 @@ static void sp_flood_do_flood_fill(SPEventContext *event_context, GdkEvent *even
     
     bci.y_limit = y_limit;
     bci.width = width;
+    bci.height = height;
     bci.threshold = threshold;
     bci.method = method;
     bci.bbox = *bbox;
     bci.screen = screen;
     bci.dtc = dtc;
+    bci.radius = prefs_get_int_attribute_limited("tools.paintbucket", "autogap", 0, 0, 3);
+    bci.max_queue_size = width * height;
+    bci.current_step = 0;
+
+    bool first_run = true;
+
+    while (!color_queue.empty() && !aborted) {
+        NR::Point color_point = color_queue.front();
+        color_queue.pop();
+
+        int cx = (int)color_point[NR::X];
+        int cy = (int)color_point[NR::Y];
+
+        unsigned char *orig_px = get_pixel(px, cx, cy, width);
+        unsigned char orig_color[4];
+        for (int i = 0; i < 4; i++) { orig_color[i] = orig_px[i]; }
+
+        unsigned char merged_orig[3];
+
+        merge_pixel_with_background(orig_color, dtc, merged_orig);
+
+        bci.merged_orig_pixel = merged_orig;
+
+        unsigned char *trace_t = get_pixel(trace_px, cx, cy, width);
+        if (!is_pixel_checked(trace_t) && !is_pixel_colored(trace_t)) {
+            if (check_if_pixel_is_paintable(px, trace_px, cx, cy, orig_color, bci)) {
+                fill_queue.push_front(color_point);
+
+                if (!first_run) {
+                    for (unsigned int y = 0; y < height; y++) {
+                        trace_t = get_pixel(trace_px, 0, y, width);
+                        for (unsigned int x = 0; x < width; x++) {
+                            clear_pixel_paintability(trace_t);
+                            trace_t += 4;
+                        }
+                    }
+                }
+                first_run = false;
+            }
+        }
+
+        while (!fill_queue.empty() && !aborted) {
+            NR::Point cp = fill_queue.front();
+            fill_queue.pop_front();
 
-    while (!fill_queue.empty() && !aborted) {
-        NR::Point cp = fill_queue.front();
-        fill_queue.pop();
-        unsigned char *s = get_pixel(px, (int)cp[NR::X], (int)cp[NR::Y], width);
-        
-        // same color at this point
-        if (compare_pixels(s, orig_color, dtc, threshold, method)) {
             int x = (int)cp[NR::X];
             int y = (int)cp[NR::Y];
             
-            bool top_fill = true;
-            bool bottom_fill = true;
-            
-            if (y > 0) { 
-                top_fill = try_add_to_queue(&fill_queue, px, trace_px, orig_color, dtc, x, y - 1, width, threshold, method, top_fill);
-            } else {
-                if (bbox->min()[NR::Y] > screen.min()[NR::Y]) {
-                    aborted = true; break;
-                } else {
-                    reached_screen_boundary = true;
+            unsigned char *trace_t = get_pixel(trace_px, x, y, width);
+            if (!is_pixel_checked(trace_t)) {
+                mark_pixel_checked(trace_t);
+
+                if (y == 0) {
+                    if (bbox->min()[NR::Y] > screen.min()[NR::Y]) {
+                        aborted = true; break;
+                    } else {
+                        reached_screen_boundary = true;
+                    }
+                }
+
+                if (y == y_limit) {
+                    if (bbox->max()[NR::Y] < screen.max()[NR::Y]) {
+                        aborted = true; break;
+                    } else {
+                        reached_screen_boundary = true;
+                    }
+                }
+
+                bci.is_left = true;
+                bci.x = x;
+                bci.y = y;
+
+                ScanlineCheckResult result = perform_bitmap_scanline_check(&fill_queue, px, trace_px, orig_color, bci);
+
+                switch (result) {
+                    case SCANLINE_CHECK_ABORTED:
+                        aborted = true;
+                        break;
+                    case SCANLINE_CHECK_BOUNDARY:
+                        reached_screen_boundary = true;
+                        break;
+                    default:
+                        break;
+                }
+
+                if (bci.x < width) {
+                    trace_t += 4;
+                    if (!is_pixel_checked(trace_t) && !is_pixel_queued(trace_t)) {
+                        mark_pixel_checked(trace_t);
+                        bci.is_left = false;
+                        bci.x = x + 1;
+
+                        result = perform_bitmap_scanline_check(&fill_queue, px, trace_px, orig_color, bci);
+
+                        switch (result) {
+                            case SCANLINE_CHECK_ABORTED:
+                                aborted = true;
+                                break;
+                            case SCANLINE_CHECK_BOUNDARY:
+                                reached_screen_boundary = true;
+                                break;
+                            default:
+                                break;
+                        }
+                    }
                 }
             }
-            if (y < y_limit) { 
-                bottom_fill = try_add_to_queue(&fill_queue, px, trace_px, orig_color, dtc, x, y + 1, width, threshold, method, bottom_fill);
-              } else {
-                  if (bbox->max()[NR::Y] < screen.max()[NR::Y]) {
-                      aborted = true; break;
-                  } else {
-                      reached_screen_boundary = true;
-                  }
-            }
-            
-            bci.is_left = true;
-            bci.x = x;
-            bci.y = y;
-            bci.top_fill = top_fill;
-            bci.bottom_fill = bottom_fill;
-            
-            ScanlineCheckResult result = perform_bitmap_scanline_check(&fill_queue, px, trace_px, orig_color, bci);
-            
-            switch (result) {
-                case SCANLINE_CHECK_ABORTED:
-                    aborted = true;
-                    break;
-                case SCANLINE_CHECK_BOUNDARY:
-                    reached_screen_boundary = true;
-                    break;
-                default:
-                    break;
-            }
-            
-            bci.is_left = false;
-            bci.x = x + 1;
-            bci.y = y;
-            bci.top_fill = top_fill;
-            bci.bottom_fill = bottom_fill;
-            
-            result = perform_bitmap_scanline_check(&fill_queue, px, trace_px, orig_color, bci);
-            
-            switch (result) {
-                case SCANLINE_CHECK_ABORTED:
-                    aborted = true;
-                    break;
-                case SCANLINE_CHECK_BOUNDARY:
-                    reached_screen_boundary = true;
-                    break;
-                default:
-                    break;
+
+            bci.current_step++;
+
+            if (bci.current_step > bci.max_queue_size) {
+                aborted = true;
             }
         }
     }
@@ -769,7 +935,7 @@ static gint sp_flood_context_item_handler(SPEventContext *event_context, SPItem
 
     switch (event->type) {
     case GDK_BUTTON_PRESS:
-        if (event->button.state & GDK_CONTROL_MASK) {
+        if ((event->button.state & GDK_CONTROL_MASK) && event->button.button == 1 && !event_context->space_panning) {
             NR::Point const button_w(event->button.x,
                                     event->button.y);
             
@@ -795,51 +961,56 @@ static gint sp_flood_context_item_handler(SPEventContext *event_context, SPItem
 
 static gint sp_flood_context_root_handler(SPEventContext *event_context, GdkEvent *event)
 {
+    static bool dragging;
+    
     gint ret = FALSE;
     SPDesktop *desktop = event_context->desktop;
 
     switch (event->type) {
     case GDK_BUTTON_PRESS:
-        if ( event->button.button == 1 ) {
+        if (event->button.button == 1 && !event_context->space_panning) {
             if (!(event->button.state & GDK_CONTROL_MASK)) {
-                if (event->button.state & GDK_MOD1_MASK) {
-                    NR::Point const button_pt(event->button.x, event->button.y);
-                    NR::Point const p(desktop->w2d(button_pt));
+                NR::Point const button_w(event->button.x,
+                                        event->button.y);
+    
+                if (Inkscape::have_viable_layer(desktop, event_context->defaultMessageContext())) {
+                    // save drag origin
+                    event_context->xp = (gint) button_w[NR::X];
+                    event_context->yp = (gint) button_w[NR::Y];
+                    event_context->within_tolerance = true;
+                    
+                    dragging = true;
+                    
+                    NR::Point const p(desktop->w2d(button_w));
                     Inkscape::Rubberband::get()->setMode(RUBBERBAND_MODE_TOUCHPATH);
                     Inkscape::Rubberband::get()->start(desktop, p);
-                } else {
-                    // set "busy" cursor
-                    desktop->setWaitingCursor();
-    
-                    if (SP_IS_EVENT_CONTEXT(event_context)) { 
-                        // Since setWaitingCursor runs main loop iterations, we may have already left this tool!
-                        // So check if the tool is valid before doing anything
-    
-                        sp_flood_do_flood_fill(event_context, event, event->button.state & GDK_SHIFT_MASK, false);
-                        
-                        // restore cursor when done; note that it may already be different if e.g. user 
-                        // switched to another tool during interruptible tracing or drawing, in which case do nothing
-                        desktop->clearWaitingCursor();
-        
-                        ret = TRUE;
-                    }
                 }
             }
         }
     case GDK_MOTION_NOTIFY:
-        if (event->motion.state & GDK_BUTTON1_MASK) {
+        if ( dragging
+             && ( event->motion.state & GDK_BUTTON1_MASK ) && !event_context->space_panning)
+        {
+            if ( event_context->within_tolerance
+                 && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
+                 && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
+                break; // do not drag if we're within tolerance from origin
+            }
+            
+            event_context->within_tolerance = false;
+            
             NR::Point const motion_pt(event->motion.x, event->motion.y);
             NR::Point const p(desktop->w2d(motion_pt));
             if (Inkscape::Rubberband::get()->is_started()) {
                 Inkscape::Rubberband::get()->move(p);
-                event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Draw over</b> areas to add to fill"));
+                event_context->defaultMessageContext()->set(Inkscape::NORMAL_MESSAGE, _("<b>Draw over</b> areas to add to fill, hold <b>Alt</b> for touch fill"));
                 gobble_motion_events(GDK_BUTTON1_MASK);
             }
         }
         break;
 
     case GDK_BUTTON_RELEASE:
-        if ( event->button.button == 1 ) {
+        if (event->button.button == 1 && !event_context->space_panning) {
             Inkscape::Rubberband::Rubberband *r = Inkscape::Rubberband::get();
             if (r->is_started()) {
                 // set "busy" cursor
@@ -848,16 +1019,22 @@ static gint sp_flood_context_root_handler(SPEventContext *event_context, GdkEven
                 if (SP_IS_EVENT_CONTEXT(event_context)) { 
                     // Since setWaitingCursor runs main loop iterations, we may have already left this tool!
                     // So check if the tool is valid before doing anything
+                    dragging = false;
 
-                    sp_flood_do_flood_fill(event_context, event, event->button.state & GDK_SHIFT_MASK, true);
+                    bool is_point_fill = event_context->within_tolerance;
+                    bool is_touch_fill = event->button.state & GDK_MOD1_MASK;
+                    
+                    sp_flood_do_flood_fill(event_context, event, event->button.state & GDK_SHIFT_MASK, is_point_fill, is_touch_fill);
                     
+                    desktop->clearWaitingCursor();
                     // restore cursor when done; note that it may already be different if e.g. user 
                     // switched to another tool during interruptible tracing or drawing, in which case do nothing
-                    desktop->clearWaitingCursor();
-    
+
                     ret = TRUE;
                 }
+
                 r->stop();
+                event_context->defaultMessageContext()->clear();
             }
         }
         break;