mirror of https://github.com/GNOME/gimp.git
168 lines
5.9 KiB
C
168 lines
5.9 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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* gimpoperationnormalmode.c
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* Copyright (C) 2012 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 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 "gimpoperationnormalmode.h"
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static gboolean gimp_operation_normal_parent_process (GeglOperation *operation,
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GeglOperationContext *context,
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const gchar *output_prop,
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const GeglRectangle *result,
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gint level);
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static gboolean gimp_operation_normal_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 (GimpOperationNormalMode, gimp_operation_normal_mode,
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GIMP_TYPE_OPERATION_POINT_LAYER_MODE)
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#define parent_class gimp_operation_normal_mode_parent_class
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static void
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gimp_operation_normal_mode_class_init (GimpOperationNormalModeClass *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:normal-mode",
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"description", "GIMP normal mode operation",
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NULL);
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operation_class->process = gimp_operation_normal_parent_process;
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point_class->process = gimp_operation_normal_mode_process;
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}
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static void
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gimp_operation_normal_mode_init (GimpOperationNormalMode *self)
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{
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}
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static gboolean
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gimp_operation_normal_parent_process (GeglOperation *operation,
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GeglOperationContext *context,
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const gchar *output_prop,
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const GeglRectangle *result,
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gint level)
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{
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const GeglRectangle *in_extent = NULL;
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const GeglRectangle *aux_extent = NULL;
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GObject *input;
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GObject *aux;
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/* get the raw values this does not increase the reference count */
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input = gegl_operation_context_get_object (context, "input");
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aux = gegl_operation_context_get_object (context, "aux");
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/* pass the input/aux buffers directly through if they are not
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* overlapping
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*/
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if (input)
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in_extent = gegl_buffer_get_abyss (GEGL_BUFFER (input));
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if (! input ||
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(aux && ! gegl_rectangle_intersect (NULL, in_extent, result)))
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{
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gegl_operation_context_set_object (context, "output", aux);
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return TRUE;
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}
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if (aux)
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aux_extent = gegl_buffer_get_abyss (GEGL_BUFFER (aux));
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if (! aux ||
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(input && ! gegl_rectangle_intersect (NULL, aux_extent, result)))
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{
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gegl_operation_context_set_object (context, "output", input);
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return TRUE;
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}
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/* chain up, which will create the needed buffers for our actual
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* process function
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*/
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return GEGL_OPERATION_CLASS (parent_class)->process (operation, context,
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output_prop, result,
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level);
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}
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static gboolean
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gimp_operation_normal_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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GimpOperationPointLayerMode *point = GIMP_OPERATION_POINT_LAYER_MODE (operation);
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gfloat *in = in_buf;
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gfloat *aux = aux_buf;
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gfloat *out = out_buf;
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if (point->premultiplied)
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{
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while (samples--)
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{
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out[0] = aux[0] + in[0] * (1.0f - aux[3]);
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out[1] = aux[1] + in[1] * (1.0f - aux[3]);
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out[2] = aux[2] + in[2] * (1.0f - aux[3]);
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out[3] = aux[3] + in[3] - aux[3] * in[3];
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in += 4;
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aux += 4;
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out += 4;
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}
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}
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else
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{
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while (samples--)
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{
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out[0] = aux[0] * aux[3] + in[0] * in[3] * (1.0 - aux[3]);
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out[1] = aux[1] * aux[3] + in[1] * in[3] * (1.0 - aux[3]);
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out[2] = aux[2] * aux[3] + in[2] * in[3] * (1.0 - aux[3]);
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out[3] = aux[3] + in[3] - aux[3] * in[3];
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in += 4;
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aux += 4;
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out += 4;
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}
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}
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return TRUE;
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}
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