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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpoperationsoftlightmode.c
* Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
* 2012 Ville Sokk <ville.sokk@gmail.com>
*
* 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 "gimpoperationsoftlightlegacy.h"
static gboolean gimp_operation_softlight_legacy_process (GeglOperation *op,
void *in,
void *layer,
void *mask,
void *out,
glong samples,
const GeglRectangle *roi,
gint level);
G_DEFINE_TYPE (GimpOperationSoftlightLegacy, gimp_operation_softlight_legacy,
GIMP_TYPE_OPERATION_LAYER_MODE)
static const gchar* reference_xml = "<?xml version='1.0' encoding='UTF-8'?>"
"<gegl>"
"<node operation='gimp:softlight-legacy'>"
" <node operation='gegl:load'>"
" <params>"
" <param name='path'>B.png</param>"
" </params>"
" </node>"
"</node>"
"<node operation='gegl:load'>"
" <params>"
" <param name='path'>A.png</param>"
" </params>"
"</node>"
"</gegl>";
static void
gimp_operation_softlight_legacy_class_init (GimpOperationSoftlightLegacyClass *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:softlight-legacy",
"description", "GIMP softlight mode operation",
"reference-image", "soft-light-mode.png",
"reference-composition", reference_xml,
NULL);
layer_mode_class->process = gimp_operation_softlight_legacy_process;
}
static void
gimp_operation_softlight_legacy_init (GimpOperationSoftlightLegacy *self)
{
}
static gboolean
gimp_operation_softlight_legacy_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;
while (samples--)
{
gfloat comp_alpha, new_alpha;
comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
if (mask)
comp_alpha *= *mask;
new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
if (comp_alpha && new_alpha)
{
gfloat ratio = comp_alpha / new_alpha;
gint b;
for (b = RED; b < ALPHA; b++)
{
#if 0
/* softlight is now used for what GIMP formerly called
* OVERLAY. We fixed OVERLAY to use the right math
* (under the name NEW_OVERLAY), and redirect uses of
* the old OVERLAY blend mode here. This math was
* formerly used for OVERLAY and is exactly the same as
* the multiply, screen, comp math used below.
* See bug #673501.
*/
gfloat comp = in[b] * (in[b] + (2.0f * layer[b]) * (1.0f - in[b]));
#endif
gfloat multiply = in[b] * layer[b];
gfloat screen = 1.0f - (1.0f - in[b]) * (1.0f - layer[b]);
gfloat comp = (1.0f - in[b]) * multiply + in[b] * screen;
out[b] = comp * ratio + in[b] * (1.0f - ratio);
}
}
else
{
gint b;
for (b = RED; b < ALPHA; b++)
{
out[b] = in[b];
}
}
out[ALPHA] = in[ALPHA];
in += 4;
layer += 4;
out += 4;
if (mask)
mask ++;
}
return TRUE;
}
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