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/* This file is an image processing operation for GEGL
*
* GEGL is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* GEGL 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with GEGL; if not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2006 Øyvind Kolås <pippin@gimp.org>
*/
#include "config.h"
#include <glib/gi18n-lib.h>
#ifdef GEGL_CHANT_PROPERTIES
gegl_chant_double (value, _("Opacity"), -10.0, 10.0, 1.0,
_("Global opacity value that is always used on top of the optional auxiliary input buffer."))
#else
#define GEGL_CHANT_TYPE_POINT_COMPOSER
#define GEGL_CHANT_C_FILE "opacity.c"
#include "gegl-chant.h"
#include "graph/gegl-node.h"
#include <stdio.h>
static void prepare (GeglOperation *self)
{
GeglNode *src_node = gegl_operation_get_source_node (self, "input");
GeglChantO *o = GEGL_CHANT_PROPERTIES (self);
if (src_node)
{
GeglOperation *op = src_node->operation;
if (op)
{
const Babl *fmt = gegl_operation_get_format (op, "output"); /* XXX: could
be a different pad */
if (fmt == babl_format ("RGBA float"))
{
/* ugly way of communicating that we want the RGBA version */
o->chant_data = (void*)0xabc;
gegl_operation_set_format (self, "input", babl_format ("RGBA float"));
gegl_operation_set_format (self, "output", babl_format ("RGBA float"));
gegl_operation_set_format (self, "aux", babl_format ("Y float"));
return;
}
}
}
o->chant_data = NULL;
gegl_operation_set_format (self, "input", babl_format ("RaGaBaA float"));
gegl_operation_set_format (self, "output", babl_format ("RaGaBaA float"));
gegl_operation_set_format (self, "aux", babl_format ("Y float"));
}
static gboolean
process (GeglOperation *op,
void *in_buf,
void *aux_buf,
void *out_buf,
glong samples,
const GeglRectangle *roi,
gint level)
{
gfloat *in = in_buf;
gfloat *out = out_buf;
gfloat *aux = aux_buf;
gfloat value = GEGL_CHANT_PROPERTIES (op)->value;
if (GEGL_CHANT_PROPERTIES (op)->chant_data) /* RGBA version indicator */
{
if (aux == NULL)
{
g_assert (value != 1.0); /* buffer should have been passed through */
while (samples--)
{
gint j;
for (j=0; j<3; j++)
out[j] = in[j];
out[3] = in[3] * value;
in += 4;
out += 4;
}
}
else if (value == 1.0)
while (samples--)
{
gint j;
for (j=0; j<4; j++)
out[j] = in[j] * (*aux);
in += 4;
out += 4;
aux += 1;
}
else
while (samples--)
{
gfloat v = (*aux) * value;
gint j;
for (j=0; j<3; j++)
out[j] = in[j];
out[3] = in[3] * v;
in += 4;
out += 4;
aux += 1;
}
}
else
{
if (aux == NULL)
{
g_assert (value != 1.0); /* buffer should have been passed through */
while (samples--)
{
gint j;
for (j=0; j<4; j++)
out[j] = in[j] * value;
in += 4;
out += 4;
}
}
else if (value == 1.0)
while (samples--)
{
gint j;
for (j=0; j<4; j++)
out[j] = in[j] * (*aux);
in += 4;
out += 4;
aux += 1;
}
else
while (samples--)
{
gfloat v = (*aux) * value;
gint j;
for (j=0; j<4; j++)
out[j] = in[j] * v;
in += 4;
out += 4;
aux += 1;
}
}
return TRUE;
}
static const char* kernel_source =
"__kernel void gegl_opacity (__global const float4 *in, \n"
" __global const float *aux, \n"
" __global float4 *out, \n"
" float value) \n"
"{ \n"
" int gid = get_global_id(0); \n"
" float4 in_v = in [gid]; \n"
" float aux_v = (aux)? aux[gid] : 1.0f; \n"
" float4 out_v; \n"
" out_v = in_v * aux_v * value; \n"
" out[gid] = out_v; \n"
"} \n";
/* Fast path when opacity is a no-op
*/
static gboolean operation_process (GeglOperation *operation,
GeglOperationContext *context,
const gchar *output_prop,
const GeglRectangle *result,
gint level)
{
GeglOperationClass *operation_class;
gpointer in, aux;
operation_class = GEGL_OPERATION_CLASS (gegl_chant_parent_class);
/* get the raw values this does not increase the reference count */
in = gegl_operation_context_get_object (context, "input");
aux = gegl_operation_context_get_object (context, "aux");
if (in && !aux && GEGL_CHANT_PROPERTIES (operation)->value == 1.0)
{
gegl_operation_context_take_object (context, "output",
g_object_ref (G_OBJECT (in)));
return TRUE;
}
/* chain up, which will create the needed buffers for our actual
* process function
*/
return operation_class->process (operation, context, output_prop, result,
gegl_operation_context_get_level (context));
}
static void
gegl_chant_class_init (GeglChantClass *klass)
{
GeglOperationClass *operation_class;
GeglOperationPointComposerClass *point_composer_class;
operation_class = GEGL_OPERATION_CLASS (klass);
point_composer_class = GEGL_OPERATION_POINT_COMPOSER_CLASS (klass);
operation_class->prepare = prepare;
operation_class->process = operation_process;
point_composer_class->process = process;
gegl_operation_class_set_keys (operation_class,
"name" , "gegl:opacity",
"categories" , "transparency",
"description",
_("Weights the opacity of the input both the value of the aux"
" input and the global value property."),
"cl-source" , kernel_source,
NULL);
}
#endif
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