c63bee3440
This operation assigns to each pixel the minimum of the maxima of all paths from it to the outside, as if the input image represents a height map, and the operation floods it with water.
241 lines
8.0 KiB
C
241 lines
8.0 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* gimpoperationflood.c
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* Copyright (C) 2016 Ell
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <cairo.h>
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#include <gegl.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include "libgimpcolor/gimpcolor.h"
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#include "libgimpmath/gimpmath.h"
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#include "operations-types.h"
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#include "gimpoperationflood.h"
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static void gimp_operation_flood_prepare (GeglOperation *operation);
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static GeglRectangle
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gimp_operation_flood_get_required_for_output (GeglOperation *self,
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const gchar *input_pad,
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const GeglRectangle *roi);
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static GeglRectangle
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gimp_operation_flood_get_cached_region (GeglOperation *self,
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const GeglRectangle *roi);
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static gboolean gimp_operation_flood_process_segment (const gfloat *src,
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gfloat *dest,
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gchar *changed,
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gint size);
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static gboolean gimp_operation_flood_process (GeglOperation *operation,
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GeglBuffer *input,
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GeglBuffer *output,
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const GeglRectangle *roi,
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gint level);
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G_DEFINE_TYPE (GimpOperationFlood, gimp_operation_flood,
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GEGL_TYPE_OPERATION_FILTER)
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#define parent_class gimp_operation_flood_parent_class
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static void
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gimp_operation_flood_class_init (GimpOperationFloodClass *klass)
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{
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GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
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GeglOperationFilterClass *filter_class = GEGL_OPERATION_FILTER_CLASS (klass);
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operation_class->want_in_place = FALSE;
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operation_class->threaded = FALSE;
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gegl_operation_class_set_keys (operation_class,
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"name", "gimp:flood",
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"categories", "gimp",
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"description", "GIMP Flood operation",
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NULL);
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operation_class->prepare = gimp_operation_flood_prepare;
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operation_class->get_required_for_output = gimp_operation_flood_get_required_for_output;
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operation_class->get_cached_region = gimp_operation_flood_get_cached_region;
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filter_class->process = gimp_operation_flood_process;
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}
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static void
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gimp_operation_flood_init (GimpOperationFlood *self)
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{
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}
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static void
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gimp_operation_flood_prepare (GeglOperation *operation)
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{
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gegl_operation_set_format (operation, "input", babl_format ("Y float"));
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gegl_operation_set_format (operation, "output", babl_format ("Y float"));
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}
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static GeglRectangle
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gimp_operation_flood_get_required_for_output (GeglOperation *self,
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const gchar *input_pad,
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const GeglRectangle *roi)
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{
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return *gegl_operation_source_get_bounding_box (self, "input");
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}
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static GeglRectangle
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gimp_operation_flood_get_cached_region (GeglOperation *self,
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const GeglRectangle *roi)
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{
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return *gegl_operation_source_get_bounding_box (self, "input");
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}
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static gboolean
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gimp_operation_flood_process_segment (const gfloat *src,
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gfloat *dest,
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gchar *changed,
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gint size)
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{
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gint dir;
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gboolean any_changed = FALSE;
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for (dir = 1; dir >= -1; dir -= 2) /* for dir in [1, -1]: ... */
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{
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gint i;
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gfloat level = 0.0;
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for (i = size; i; i--)
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{
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if (*src > level) { level = *src; }
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if (*dest < level) { level = *dest; }
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else if (level < *dest) { *dest = level;
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*changed = any_changed = TRUE; }
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if (i > 1)
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{
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src += dir;
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dest += dir;
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changed += dir;
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}
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}
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}
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return any_changed;
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}
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static gboolean
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gimp_operation_flood_process (GeglOperation *operation,
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GeglBuffer *input,
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GeglBuffer *output,
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const GeglRectangle *roi,
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gint level)
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{
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const Babl *input_format = babl_format ("Y float");
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const Babl *output_format = babl_format ("Y float");
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gfloat *src_buffer, *dest_buffer;
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gchar *horz_changed, *vert_changed;
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gboolean any_changed;
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gint forced;
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gboolean horz;
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GeglColor *color;
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g_return_val_if_fail (input != output, FALSE);
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src_buffer = g_new (gfloat, MAX (roi->width, roi->height));
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dest_buffer = g_new (gfloat, MAX (roi->width, roi->height));
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horz_changed = g_new (gchar, roi->width);
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vert_changed = g_new (gchar, roi->height);
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color = gegl_color_new ("#fff");
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gegl_buffer_set_color (output, roi, color);
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g_object_unref (color);
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forced = 2; /* Force at least one horizontal and one vertical iterations. */
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horz = TRUE;
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do
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{
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gint count, size;
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GeglRectangle rect = *roi;
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gint *coord;
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gchar *prev_changed, *curr_changed;
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gint i;
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any_changed = FALSE;
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if (horz)
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{
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count = roi->height;
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size = roi->width;
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rect.height = 1;
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coord = &rect.y;
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prev_changed = vert_changed;
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curr_changed = horz_changed;
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}
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else
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{
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count = roi->width;
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size = roi->height;
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rect.width = 1;
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coord = &rect.x;
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prev_changed = horz_changed;
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curr_changed = vert_changed;
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}
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for (i = 0; i < count; i++, (*coord)++)
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{
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gboolean this_changed;
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if (! (forced || prev_changed[i]))
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continue;
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prev_changed[i] = FALSE;
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gegl_buffer_get (input, &rect, 1.0, input_format, src_buffer,
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GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
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gegl_buffer_get (output, &rect, 1.0, output_format, dest_buffer,
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GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
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this_changed = gimp_operation_flood_process_segment (src_buffer,
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dest_buffer,
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curr_changed,
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size);
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if (this_changed)
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{
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gegl_buffer_set (output, &rect, 0, output_format, dest_buffer,
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GEGL_AUTO_ROWSTRIDE);
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any_changed = TRUE;
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}
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}
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horz = ! horz;
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if (forced)
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forced--;
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}
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while (forced || any_changed);
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g_free (src_buffer);
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g_free (dest_buffer);
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g_free (horz_changed);
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g_free (vert_changed);
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return TRUE;
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}
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