mirror of https://github.com/GNOME/gimp.git
185 lines
6.2 KiB
C
185 lines
6.2 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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* gimpoperationcolorerasemode.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 <cairo.h>
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#include <gegl-plugin.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include "libgimpcolor/gimpcolor.h"
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#include "operations-types.h"
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#include "gimpoperationcolorerasemode.h"
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static gboolean gimp_operation_color_erase_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 (GimpOperationColorEraseMode, gimp_operation_color_erase_mode,
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GIMP_TYPE_OPERATION_POINT_LAYER_MODE)
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static void
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gimp_operation_color_erase_mode_class_init (GimpOperationColorEraseModeClass *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:color-erase-mode",
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"description", "GIMP color erase mode operation",
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NULL);
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point_class->process = gimp_operation_color_erase_mode_process;
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}
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static void
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gimp_operation_color_erase_mode_init (GimpOperationColorEraseMode *self)
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{
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}
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static gboolean
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gimp_operation_color_erase_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_color_erase_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_color_erase_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 layer_alpha;
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GimpRGB bgcolor, color, alpha;
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layer_alpha = layer[ALPHA] * opacity;
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if (has_mask)
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layer_alpha *= *mask;
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gimp_rgba_set (&color, in[0], in[1], in[2], in[3]);
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gimp_rgba_set (&bgcolor, layer[0], layer[1], layer[2], layer_alpha);
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/* start of helper function copied from legacy 8-bit blending code */
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alpha.a = color.a;
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if (bgcolor.r < 0.0001)
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alpha.r = color.r;
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else if ( color.r > bgcolor.r )
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alpha.r = (color.r - bgcolor.r) / (1.0 - bgcolor.r);
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else if (color.r < bgcolor.r)
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alpha.r = (bgcolor.r - color.r) / bgcolor.r;
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else alpha.r = 0.0;
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if (bgcolor.g < 0.0001)
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alpha.g = color.g;
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else if ( color.g > bgcolor.g )
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alpha.g = (color.g - bgcolor.g) / (1.0 - bgcolor.g);
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else if ( color.g < bgcolor.g )
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alpha.g = (bgcolor.g - color.g) / (bgcolor.g);
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else alpha.g = 0.0;
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if (bgcolor.b < 0.0001)
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alpha.b = color.b;
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else if ( color.b > bgcolor.b )
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alpha.b = (color.b - bgcolor.b) / (1.0 - bgcolor.b);
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else if ( color.b < bgcolor.b )
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alpha.b = (bgcolor.b - color.b) / (bgcolor.b);
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else alpha.b = 0.0;
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if ( alpha.r > alpha.g )
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{
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if ( alpha.r > alpha.b )
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{
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color.a = alpha.r;
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}
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else
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{
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color.a = alpha.b;
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}
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}
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else if ( alpha.g > alpha.b )
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{
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color.a = alpha.g;
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}
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else
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{
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color.a = alpha.b;
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}
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color.a = (1.0 - bgcolor.a) + (color.a * bgcolor.a);
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if (color.a > 0.0001)
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{
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color.r = (color.r - bgcolor.r) / color.a + bgcolor.r;
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color.g = (color.g - bgcolor.g) / color.a + bgcolor.g;
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color.b = (color.b - bgcolor.b) / color.a + bgcolor.b;
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color.a *= alpha.a;
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}
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/* end of helper function */
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out[0] = color.r;
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out[1] = color.g;
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out[2] = color.b;
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out[3] = color.a;
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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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