mirror of https://github.com/GNOME/gimp.git
153 lines
5.3 KiB
C
153 lines
5.3 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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* gimpoperationdissolvemode.c
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* Copyright (C) 2012 Ville Sokk <ville.sokk@gmail.com>
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* 2012 Øyvind Kolås <pippin@gimp.org>
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* 2003 Helvetix Victorinox
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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 <gegl-plugin.h>
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#include "operations-types.h"
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#include "gimpoperationdissolvemode.h"
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#define RANDOM_TABLE_SIZE 4096
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static gboolean gimp_operation_dissolve_mode_process (GeglOperation *operation,
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void *in_buf,
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void *aux_buf,
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void *aux2_buf,
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void *out_buf,
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glong samples,
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const GeglRectangle *result,
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gint level);
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G_DEFINE_TYPE (GimpOperationDissolveMode, gimp_operation_dissolve_mode,
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GIMP_TYPE_OPERATION_POINT_LAYER_MODE)
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static gint32 random_table[RANDOM_TABLE_SIZE];
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static void
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gimp_operation_dissolve_mode_class_init (GimpOperationDissolveModeClass *klass)
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{
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GeglOperationClass *operation_class;
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GeglOperationPointComposer3Class *point_composer_class;
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GRand *gr;
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gint i;
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operation_class = GEGL_OPERATION_CLASS (klass);
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point_composer_class = GEGL_OPERATION_POINT_COMPOSER3_CLASS (klass);
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gegl_operation_class_set_keys (operation_class,
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"name", "gimp:dissolve-mode",
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"description", "GIMP dissolve mode operation",
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"categories", "compositors",
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NULL);
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point_composer_class->process = gimp_operation_dissolve_mode_process;
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/* generate a table of random seeds */
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gr = g_rand_new_with_seed (314159265);
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for (i = 0; i < RANDOM_TABLE_SIZE; i++)
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random_table[i] = g_rand_int (gr);
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g_rand_free (gr);
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}
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static void
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gimp_operation_dissolve_mode_init (GimpOperationDissolveMode *self)
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{
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}
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static gboolean
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gimp_operation_dissolve_mode_process (GeglOperation *operation,
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void *in_buf,
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void *aux_buf,
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void *aux2_buf,
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void *out_buf,
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glong samples,
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const GeglRectangle *result,
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gint level)
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{
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gfloat opacity = GIMP_OPERATION_POINT_LAYER_MODE (operation)->opacity;
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return gimp_operation_dissolve_mode_process_pixels (in_buf, aux_buf, aux2_buf, out_buf, opacity, samples, result, level);
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}
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gboolean
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gimp_operation_dissolve_mode_process_pixels (gfloat *in,
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gfloat *aux,
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gfloat *mask,
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gfloat *out,
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gfloat opacity,
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glong samples,
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const GeglRectangle *result,
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gint level)
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{
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const gboolean has_mask = mask != NULL;
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gint x, y;
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for (y = result->y; y < result->y + result->height; y++)
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{
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GRand *gr = g_rand_new_with_seed (random_table[y % RANDOM_TABLE_SIZE]);
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/* fast forward through the rows pseudo random sequence */
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for (x = 0; x < result->x; x++)
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g_rand_int (gr);
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for (x = result->x; x < result->x + result->width; x++)
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{
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gfloat value = aux[ALPHA] * opacity * 255;
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if (has_mask)
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value *= *mask;
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if (g_rand_int_range (gr, 0, 255) >= value)
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{
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out[0] = in[0];
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out[1] = in[1];
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out[2] = in[2];
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out[3] = in[3];
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}
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else
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{
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out[0] = aux[0];
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out[1] = aux[1];
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out[2] = aux[2];
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out[3] = 1.0;
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}
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in += 4;
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out += 4;
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aux += 4;
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if (has_mask)
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mask ++;
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}
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g_rand_free (gr);
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}
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return TRUE;
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}
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