From 3a5736c78a624655607e75d01a5b3a37d0cc48e6 Mon Sep 17 00:00:00 2001 From: johncoswell Date: Thu, 1 Mar 2007 01:51:13 +0000 Subject: [PATCH] Optimize flood algorithm to only scan adjacent runs once --- src/flood-context.cpp | 38 ++++++++++++++++++++++++++------------ 1 file changed, 26 insertions(+), 12 deletions(-) diff --git a/src/flood-context.cpp b/src/flood-context.cpp index a6a66e952..611c46646 100644 --- a/src/flood-context.cpp +++ b/src/flood-context.cpp @@ -269,11 +269,15 @@ static bool compare_pixels(unsigned char *a, unsigned char *b, int tolerance) { return true; } -static void try_add_to_queue(std::queue *fill_queue, guchar *px, unsigned char *orig, int x, int y, int width, int tolerance) { +static bool try_add_to_queue(std::queue *fill_queue, guchar *px, unsigned char *orig, int x, int y, int width, int tolerance, bool fill_switch) { unsigned char *t = get_pixel(px, x, y, width); if (compare_pixels(t, orig, tolerance)) { - fill_queue->push(NR::Point(x, y)); + if (fill_switch) { + fill_queue->push(NR::Point(x, y)); + return false; + } } + return true; } static void do_trace(GdkPixbuf *px, SPDesktop *desktop, NR::Matrix transform) { @@ -460,20 +464,28 @@ static void sp_flood_do_flood_fill(SPEventContext *event_context, GdkEvent *even int x = (int)cp[NR::X]; int y = (int)cp[NR::Y]; + bool top_fill = true; + bool bottom_fill = true; + if (y > 0) { - try_add_to_queue(&fill_queue, px, orig_color, x, y - 1, width, tolerance); + top_fill = try_add_to_queue(&fill_queue, px, orig_color, x, y - 1, width, tolerance, top_fill); } else { aborted = true; break; } if (y < y_limit) { - try_add_to_queue(&fill_queue, px, orig_color, x, y + 1, width, tolerance); + bottom_fill = try_add_to_queue(&fill_queue, px, orig_color, x, y + 1, width, tolerance, bottom_fill); } else { aborted = true; break; } + bool default_top_fill = top_fill; + bool default_bottom_fill = bottom_fill; + unsigned char *t, *trace_t; bool ok = false; + trace_t = get_pixel(trace_px, left, y, width); + do { ok = false; // go left @@ -481,10 +493,9 @@ static void sp_flood_do_flood_fill(SPEventContext *event_context, GdkEvent *even t = get_pixel(px, left, y, width); if (compare_pixels(t, orig_color, tolerance)) { for (int i = 0; i < 4; i++) { t[i] = 255 - t[i]; } - trace_t = get_pixel(trace_px, left, y, width); - trace_t[3] = 255; - if (y > 0) { try_add_to_queue(&fill_queue, px, orig_color, left, y - 1, width, tolerance); } - if (y < y_limit) { try_add_to_queue(&fill_queue, px, orig_color, left, y + 1, width, tolerance); } + trace_t[3] = 255; trace_t -= 4; + if (y > 0) { top_fill = try_add_to_queue(&fill_queue, px, orig_color, left, y - 1, width, tolerance, top_fill); } + if (y < y_limit) { bottom_fill = try_add_to_queue(&fill_queue, px, orig_color, left, y + 1, width, tolerance, bottom_fill); } left--; ok = true; } } else { @@ -492,6 +503,10 @@ static void sp_flood_do_flood_fill(SPEventContext *event_context, GdkEvent *even } } while (ok); + top_fill = default_top_fill; + bottom_fill = default_bottom_fill; + trace_t = get_pixel(trace_px, right, y, width); + do { ok = false; // go right @@ -499,10 +514,9 @@ static void sp_flood_do_flood_fill(SPEventContext *event_context, GdkEvent *even t = get_pixel(px, right, y, width); if (compare_pixels(t, orig_color, tolerance)) { for (int i = 0; i < 4; i++) { t[i] = 255 - t[i]; } - trace_t = get_pixel(trace_px, right, y, width); - trace_t[3] = 255; - if (y > 0) { try_add_to_queue(&fill_queue, px, orig_color, right, y - 1, width, tolerance); } - if (y < y_limit) { try_add_to_queue(&fill_queue, px, orig_color, right, y + 1, width, tolerance); } + trace_t[3] = 255; trace_t += 4; + if (y > 0) { top_fill = try_add_to_queue(&fill_queue, px, orig_color, right, y - 1, width, tolerance, top_fill); } + if (y < y_limit) { bottom_fill = try_add_to_queue(&fill_queue, px, orig_color, right, y + 1, width, tolerance, bottom_fill); } right++; ok = true; } } else { -- 2.30.2