mirror of https://github.com/GNOME/gimp.git
117 lines
4.1 KiB
C
117 lines
4.1 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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* gimpoperationgrainmergemode.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 2 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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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 "gimpoperationgrainmergemode.h"
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static void gimp_operation_grain_merge_mode_prepare (GeglOperation *operation);
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static gboolean gimp_operation_grain_merge_mode_process (GeglOperation *operation,
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void *in_buf,
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void *aux_buf,
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void *out_buf,
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glong samples,
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const GeglRectangle *roi,
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gint level);
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G_DEFINE_TYPE (GimpOperationGrainMergeMode, gimp_operation_grain_merge_mode,
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GIMP_TYPE_OPERATION_POINT_LAYER_MODE)
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static void
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gimp_operation_grain_merge_mode_class_init (GimpOperationGrainMergeModeClass *klass)
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{
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GeglOperationClass *operation_class;
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GeglOperationPointComposerClass *point_class;
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operation_class = GEGL_OPERATION_CLASS (klass);
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point_class = GEGL_OPERATION_POINT_COMPOSER_CLASS (klass);
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gegl_operation_class_set_keys (operation_class,
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"name", "gimp:grain-merge-mode",
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"description", "GIMP grain merge mode operation",
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NULL);
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operation_class->prepare = gimp_operation_grain_merge_mode_prepare;
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point_class->process = gimp_operation_grain_merge_mode_process;
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}
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static void
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gimp_operation_grain_merge_mode_init (GimpOperationGrainMergeMode *self)
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{
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}
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static void
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gimp_operation_grain_merge_mode_prepare (GeglOperation *operation)
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{
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const Babl *format = babl_format ("R'G'B'A float");
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gegl_operation_set_format (operation, "input", format);
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gegl_operation_set_format (operation, "aux", format);
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gegl_operation_set_format (operation, "output", format);
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}
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static gboolean
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gimp_operation_grain_merge_mode_process (GeglOperation *operation,
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void *in_buf,
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void *aux_buf,
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void *out_buf,
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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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gfloat *in = in_buf;
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gfloat *layer = aux_buf;
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gfloat *out = out_buf;
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while (samples--)
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{
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gint b;
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gfloat comp_alpha = MIN (in[ALPHA], layer[ALPHA]);
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gfloat new_alpha = in[ALPHA] + (1 - in[ALPHA]) * comp_alpha;
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gfloat ratio = comp_alpha / new_alpha;
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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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comp = CLAMP (comp, 0, 1);
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out[b] = comp * ratio + in[b] * (1 - ratio) + 0.0001;
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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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}
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return TRUE;
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}
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