mirror of https://github.com/GNOME/gimp.git
139 lines
4.8 KiB
C
139 lines
4.8 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 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 "gimpoperationgrainmergemode.h"
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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 *aux2_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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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-merge-mode",
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"description", "GIMP grain merge mode operation",
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NULL);
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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 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 *aux2_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 opacity = GIMP_OPERATION_POINT_LAYER_MODE (operation)->opacity;
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return gimp_operation_grain_merge_mode_process_pixels (in_buf, aux_buf, aux2_buf, out_buf, opacity, samples, roi, level);
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}
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gboolean
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gimp_operation_grain_merge_mode_process_pixels (gfloat *in,
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gfloat *layer,
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gfloat *mask,
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gfloat *out,
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gfloat opacity,
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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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const gboolean has_mask = mask != NULL;
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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 (has_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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comp = CLAMP (comp, 0.0, 1.0);
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out[b] = comp * ratio + in[b] * (1.0 - ratio);
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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 (has_mask)
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mask ++;
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}
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return TRUE;
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}
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