mirror of https://github.com/GNOME/gimp.git
159 lines
5.4 KiB
C
159 lines
5.4 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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* gimpoperationsoftlightmode.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 "gimpoperationsoftlightmode.h"
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static gboolean gimp_operation_softlight_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 (GimpOperationSoftlightMode, gimp_operation_softlight_mode,
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GIMP_TYPE_OPERATION_POINT_LAYER_MODE)
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static const gchar* reference_xml = "<?xml version='1.0' encoding='UTF-8'?>"
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"<gegl>"
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"<node operation='gimp:softlight-mode'>"
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" <node operation='gegl:load'>"
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" <params>"
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" <param name='path'>B.png</param>"
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" </params>"
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" </node>"
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"</node>"
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"<node operation='gegl:load'>"
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" <params>"
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" <param name='path'>A.png</param>"
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" </params>"
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"</node>"
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"</gegl>";
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static void
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gimp_operation_softlight_mode_class_init (GimpOperationSoftlightModeClass *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:softlight-mode",
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"description", "GIMP softlight mode operation",
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"reference-image", "soft-light-mode.png",
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"reference-composition", reference_xml,
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NULL);
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point_class->process = gimp_operation_softlight_mode_process;
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}
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static void
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gimp_operation_softlight_mode_init (GimpOperationSoftlightMode *self)
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{
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}
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static gboolean
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gimp_operation_softlight_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_softlight_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_softlight_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 multiply = in[b] * layer[b];
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gfloat screen = 1.0 - (1.0 - in[b]) * (1.0 - layer[b]);
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gfloat comp = (1.0 - in[b]) * multiply + in[b] * screen;
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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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