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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpoperationreplace.c
* Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
*
* 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 "gimpoperationreplace.h"
static gboolean gimp_operation_replace_process (GeglOperation *op,
void *in,
void *layer,
void *mask,
void *out,
glong samples,
const GeglRectangle *roi,
gint level);
static GimpLayerCompositeRegion gimp_operation_replace_get_affected_region (GimpOperationLayerMode *layer_mode);
G_DEFINE_TYPE (GimpOperationReplace, gimp_operation_replace,
GIMP_TYPE_OPERATION_LAYER_MODE)
static void
gimp_operation_replace_class_init (GimpOperationReplaceClass *klass)
{
GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
GimpOperationLayerModeClass *layer_mode_class = GIMP_OPERATION_LAYER_MODE_CLASS (klass);
gegl_operation_class_set_keys (operation_class,
"name", "gimp:replace",
"description", "GIMP replace mode operation",
NULL);
layer_mode_class->process = gimp_operation_replace_process;
layer_mode_class->get_affected_region = gimp_operation_replace_get_affected_region;
}
static void
gimp_operation_replace_init (GimpOperationReplace *self)
{
}
static gboolean
gimp_operation_replace_process (GeglOperation *op,
void *in_p,
void *layer_p,
void *mask_p,
void *out_p,
glong samples,
const GeglRectangle *roi,
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;
switch (layer_mode->real_composite_mode)
{
case GIMP_LAYER_COMPOSITE_UNION:
case GIMP_LAYER_COMPOSITE_AUTO:
while (samples--)
{
gfloat opacity_value = opacity;
gfloat new_alpha;
gint b;
if (has_mask)
opacity_value *= *mask;
new_alpha = (layer[ALPHA] - in[ALPHA]) * opacity_value + in[ALPHA];
if (new_alpha)
{
gfloat ratio = opacity_value * layer[ALPHA] / new_alpha;
for (b = RED; b < ALPHA; b++)
out[b] = (layer[b] - in[b]) * ratio + in[b];
}
else
{
for (b = RED; b < ALPHA; b++)
out[b] = in[b];
}
out[ALPHA] = new_alpha;
in += 4;
layer += 4;
out += 4;
if (has_mask)
mask++;
}
break;
case GIMP_LAYER_COMPOSITE_CLIP_TO_BACKDROP:
while (samples--)
{
gfloat opacity_value = opacity;
gfloat new_alpha;
gint b;
if (has_mask)
opacity_value *= *mask;
new_alpha = in[ALPHA] * (1.0f - opacity_value);
for (b = RED; b < ALPHA; b++)
out[b] = in[b];
out[ALPHA] = new_alpha;
in += 4;
out += 4;
if (has_mask)
mask++;
}
break;
case GIMP_LAYER_COMPOSITE_CLIP_TO_LAYER:
while (samples--)
{
gfloat opacity_value = opacity;
gfloat new_alpha;
gint b;
if (has_mask)
opacity_value *= *mask;
new_alpha = layer[ALPHA] * opacity_value;
if (new_alpha)
{
for (b = RED; b < ALPHA; b++)
out[b] = layer[b];
}
else
{
for (b = RED; b < ALPHA; b++)
out[b] = in[b];
}
out[ALPHA] = new_alpha;
in += 4;
layer += 4;
out += 4;
if (has_mask)
mask++;
}
break;
case GIMP_LAYER_COMPOSITE_INTERSECTION:
while (samples--)
{
gint b;
for (b = RED; b < ALPHA; b++)
out[b] = in[b];
out[ALPHA] = 0.0f;
in += 4;
out += 4;
}
break;
}
return TRUE;
}
static GimpLayerCompositeRegion
gimp_operation_replace_get_affected_region (GimpOperationLayerMode *layer_mode)
{
GimpLayerCompositeRegion affected_region = GIMP_LAYER_COMPOSITE_REGION_INTERSECTION;
if (layer_mode->opacity != 0.0)
affected_region |= GIMP_LAYER_COMPOSITE_REGION_DESTINATION;
/* if opacity != 1.0, or we have a mask, then we also affect SOURCE, but this
* is considered the case anyway, so no need for special handling.
*/
return affected_region;
}
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