129 lines
4.2 KiB
C
129 lines
4.2 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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* gimpoperationreplace.c
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* Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
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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 "gimpoperationreplace.h"
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static gboolean gimp_operation_replace_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 (GimpOperationReplace, gimp_operation_replace,
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GIMP_TYPE_OPERATION_POINT_LAYER_MODE)
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static void
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gimp_operation_replace_class_init (GimpOperationReplaceClass *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:replace",
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"description", "GIMP replace mode operation",
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NULL);
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point_class->process = gimp_operation_replace_process;
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}
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static void
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gimp_operation_replace_init (GimpOperationReplace *self)
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{
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}
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static gboolean
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gimp_operation_replace_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_replace_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_replace_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 opacity_value = opacity;
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gfloat new_alpha;
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gint b;
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if (has_mask)
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opacity_value *= *mask;
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new_alpha = (layer[ALPHA] - in[ALPHA]) * opacity_value + in[ALPHA];
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if (new_alpha)
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{
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gfloat ratio = opacity_value * layer[ALPHA] / new_alpha;
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for (b = RED; b < ALPHA; b++)
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out[b] = (layer[b] - in[b]) * ratio + in[b];
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}
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else
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{
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for (b = RED; b < ALPHA; b++)
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out[b] = in[b];
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}
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out[ALPHA] = new_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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