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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpoperationdissolve.c
* Copyright (C) 2012 Ville Sokk <ville.sokk@gmail.com>
* 2012 Øyvind Kolås <pippin@gimp.org>
* 2003 Helvetix Victorinox
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl-plugin.h>
#include "../operations-types.h"
#include "gimpoperationdissolve.h"
#define RANDOM_TABLE_SIZE 4096
static gboolean gimp_operation_dissolve_process (GeglOperation *op,
void *in,
void *layer,
void *mask,
void *out,
glong samples,
const GeglRectangle *result,
gint level);
static GimpLayerCompositeRegion gimp_operation_dissolve_get_affected_region (GimpOperationLayerMode *layer_mode);
G_DEFINE_TYPE (GimpOperationDissolve, gimp_operation_dissolve,
GIMP_TYPE_OPERATION_LAYER_MODE)
static gint32 random_table[RANDOM_TABLE_SIZE];
static void
gimp_operation_dissolve_class_init (GimpOperationDissolveClass *klass)
{
GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
GRand *gr;
gint i;
gegl_operation_class_set_keys (operation_class,
"name", "gimp:dissolve",
"description", "GIMP dissolve mode operation",
"categories", "compositors",
NULL);
layer_mode_class->process = gimp_operation_dissolve_process;
layer_mode_class->get_affected_region = gimp_operation_dissolve_get_affected_region;
/* generate a table of random seeds */
gr = g_rand_new_with_seed (314159265);
for (i = 0; i < RANDOM_TABLE_SIZE; i++)
random_table[i] = g_rand_int (gr);
g_rand_free (gr);
}
static void
gimp_operation_dissolve_init (GimpOperationDissolve *self)
{
}
static gboolean
gimp_operation_dissolve_process (GeglOperation *op,
void *in_p,
void *layer_p,
void *mask_p,
void *out_p,
glong samples,
const GeglRectangle *result,
gint level)
{
GimpOperationLayerMode *layer_mode = (gpointer) op;
gfloat *in = in_p;
gfloat *out = out_p;
gfloat *layer = layer_p;
gfloat *mask = mask_p;
gfloat opacity = layer_mode->opacity;
const gboolean has_mask = mask != NULL;
gint x, y;
for (y = result->y; y < result->y + result->height; y++)
{
GRand *gr;
/* The offset can be negative. I could just abs() the result, but we
* probably prefer to use different indexes of the table when possible for
* nicer randomization, so let's cycle the modulo so that -1 is the last
* table index.
*/
gr = g_rand_new_with_seed (random_table[((y % RANDOM_TABLE_SIZE) + RANDOM_TABLE_SIZE) % RANDOM_TABLE_SIZE]);
/* fast forward through the rows pseudo random sequence */
for (x = 0; x < result->x; x++)
g_rand_int (gr);
for (x = result->x; x < result->x + result->width; x++)
{
gfloat value = layer[ALPHA] * opacity * 255;
if (has_mask)
value *= *mask;
if (g_rand_int_range (gr, 0, 255) >= value)
{
out[0] = in[0];
out[1] = in[1];
out[2] = in[2];
if (layer_mode->composite_mode == GIMP_LAYER_COMPOSITE_UNION ||
layer_mode->composite_mode == GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP)
{
out[3] = in[3];
}
else
{
out[3] = 0.0f;
}
}
else
{
out[0] = layer[0];
out[1] = layer[1];
out[2] = layer[2];
if (layer_mode->composite_mode == GIMP_LAYER_COMPOSITE_UNION ||
layer_mode->composite_mode == GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER)
{
out[3] = 1.0f;
}
else
{
out[3] = in[3];
}
}
in += 4;
layer += 4;
out += 4;
if (has_mask)
mask++;
}
g_rand_free (gr);
}
return TRUE;
}
static GimpLayerCompositeRegion
gimp_operation_dissolve_get_affected_region (GimpOperationLayerMode *layer_mode)
{
return GIMP_LAYER_COMPOSITE_REGION_SOURCE;
}
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