Moved to GIMP.
On Sun, Mar 18, 2012 at 9:53 PM, Ville Sokk <[email protected]> wrote:
> Dissolve blending mode. The category should be changed, I don't know
> about the compositor categories so I just left it at
> "compositors:math". I tried to follow the way GIMP's dissolve works
> but gegl is obviously different. There's no mask or opacity input like
> in GIMP, I assume masking or gegl:opacity is already done on the
> inputs. Tell me if I need to change something or add those properties.
/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpoperationdissolvemode.c
* Copyright (C) 2012 Ville Sokk <[email protected]>
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <gegl-plugin.h>
#include "gimp-gegl-types.h"
#include "gimpoperationdissolvemode.h"
#include <glib.h>
static gboolean gimp_operation_dissolve_mode_process (GeglOperation *operation,
void *in_buf,
void *aux_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi);
G_DEFINE_TYPE (GimpOperationDissolveMode, gimp_operation_dissolve_mode,
GIMP_TYPE_OPERATION_POINT_LAYER_MODE)
#define RANDOM_TABLE_SIZE 4096
static gint32 random_table[RANDOM_TABLE_SIZE];
#define A (ALPHA)
#define inA (in[A])
#define inCa (in[i])
#define layerA (layer[A])
#define layerC (layer[A] ? layer[i] / layer[A] : 0.0)
#define outCa (out[i])
#define outA (out[A])
#define EACH_CHANNEL(expr) \
for (i = RED; i < ALPHA; i++) \
{ \
expr; \
}
static void
gimp_operation_dissolve_mode_class_init (GimpOperationDissolveModeClass *klass)
{
GeglOperationClass *operation_class;
GeglOperationPointComposerClass *point_class;
operation_class = GEGL_OPERATION_CLASS (klass);
point_class = GEGL_OPERATION_POINT_COMPOSER_CLASS (klass);
operation_class->name = "gimp:dissolve-mode";
operation_class->description = "GIMP dissolve mode operation";
point_class->process = gimp_operation_dissolve_mode_process;
}
static void
gimp_operation_dissolve_mode_init (GimpOperationDissolveMode *self)
{
GRand *gr;
gint i;
#define RANDOM_SEED 314159265
/* generate a table of random seeds */
gr = g_rand_new_with_seed (RANDOM_SEED);
for (i = 0; i < RANDOM_TABLE_SIZE; i++)
{
random_table[i] = g_rand_int (gr);
}
g_rand_free (gr);
}
static gboolean
gimp_operation_dissolve_mode_process (GeglOperation *operation,
void *in_buf,
void *aux_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi)
{
gfloat *in = in_buf;
gfloat *layer = aux_buf;
gfloat *out = out_buf;
GRand *gr = g_rand_new ();
gint row, pixel, i;
gdouble rand_val;
gint x = roi->x;
gint y = roi->y;
gint width = roi->width;
gint height = roi->height;
for (row = 0; row < height; row++)
{
gr = g_rand_new_with_seed (random_table[(y + row) % RANDOM_TABLE_SIZE]);
for (i = 0; i < x; i++)
{
g_rand_int (gr);
}
for (pixel = 0; pixel < width; pixel++)
{
/* dissolve if random value is >= opacity */
rand_val = g_rand_double_range (gr, 0.0, 1.0);
if (layerA >= rand_val)
{
outA = 1.0;
EACH_CHANNEL (outCa = layerC);
}
else
{
outA = inA;
EACH_CHANNEL (outCa = inCa);
}
in += 4;
layer += 4;
out += 4;
}
g_rand_free (gr);
}
return TRUE;
}
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