119 lines
3.6 KiB
C
119 lines
3.6 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* gimpoperationgrainextractmode.c
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* Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
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* 2012 Ville Sokk <ville.sokk@gmail.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gegl-plugin.h>
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#include "../operations-types.h"
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#include "gimpoperationgrainextractlegacy.h"
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G_DEFINE_TYPE (GimpOperationGrainExtractLegacy, gimp_operation_grain_extract_legacy,
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GIMP_TYPE_OPERATION_LAYER_MODE)
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static void
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gimp_operation_grain_extract_legacy_class_init (GimpOperationGrainExtractLegacyClass *klass)
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{
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GeglOperationClass *operation_class;
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GeglOperationPointComposer3Class *point_class;
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operation_class = GEGL_OPERATION_CLASS (klass);
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point_class = GEGL_OPERATION_POINT_COMPOSER3_CLASS (klass);
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gegl_operation_class_set_keys (operation_class,
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"name", "gimp:grain-extract-legacy",
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"description", "GIMP grain extract mode operation",
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NULL);
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point_class->process = gimp_operation_grain_extract_legacy_process;
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}
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static void
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gimp_operation_grain_extract_legacy_init (GimpOperationGrainExtractLegacy *self)
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{
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}
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gboolean
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gimp_operation_grain_extract_legacy_process (GeglOperation *op,
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void *in_p,
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void *layer_p,
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void *mask_p,
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void *out_p,
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glong samples,
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const GeglRectangle *roi,
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gint level)
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{
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GimpOperationLayerMode *layer_mode = (gpointer) op;
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gfloat *in = in_p;
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gfloat *out = out_p;
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gfloat *layer = layer_p;
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gfloat *mask = mask_p;
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gfloat opacity = layer_mode->opacity;
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while (samples--)
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{
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gfloat comp_alpha, new_alpha;
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comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
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if (mask)
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comp_alpha *= *mask;
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new_alpha = in[ALPHA] + (1.0 - in[ALPHA]) * comp_alpha;
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if (comp_alpha && new_alpha)
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{
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gfloat ratio = comp_alpha / new_alpha;
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gint b;
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for (b = RED; b < ALPHA; b++)
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{
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gfloat comp = in[b] - layer[b] + 0.5;
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out[b] = comp * ratio + in[b] * (1.0 - ratio);
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out[b] = CLAMP (out[b], 0.0, 1.0);
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}
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}
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else
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{
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gint b;
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for (b = RED; b < ALPHA; b++)
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{
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out[b] = in[b];
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}
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}
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out[ALPHA] = in[ALPHA];
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in += 4;
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layer += 4;
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out += 4;
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if (mask)
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mask++;
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}
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return TRUE;
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}
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