mirror of https://github.com/GNOME/gimp.git
app: added gegl version of color erase mode
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321a113212
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8079285c91
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@ -3,6 +3,7 @@
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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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@ -21,13 +22,18 @@
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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 void gimp_operation_color_erase_mode_prepare (GeglOperation *operation);
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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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@ -56,7 +62,8 @@ gimp_operation_color_erase_mode_class_init (GimpOperationColorEraseModeClass *kl
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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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operation_class->prepare = gimp_operation_color_erase_mode_prepare;
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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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@ -64,6 +71,17 @@ gimp_operation_color_erase_mode_init (GimpOperationColorEraseMode *self)
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{
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}
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static void
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gimp_operation_color_erase_mode_prepare (GeglOperation *operation)
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{
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const Babl *format = babl_format ("R'G'B'A float");
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gegl_operation_set_format (operation, "input", format);
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gegl_operation_set_format (operation, "aux", format);
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gegl_operation_set_format (operation, "aux2", babl_format ("Y float"));
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gegl_operation_set_format (operation, "output", format);
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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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@ -74,21 +92,97 @@ gimp_operation_color_erase_mode_process (GeglOperation *operation,
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const GeglRectangle *roi,
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gint level)
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{
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gfloat *in = in_buf;
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gfloat *layer = aux_buf;
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gfloat *out = out_buf;
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gdouble opacity = GIMP_OPERATION_POINT_LAYER_MODE (operation)->opacity;
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gfloat *in = in_buf;
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gfloat *layer = aux_buf;
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gfloat *mask = aux2_buf;
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gfloat *out = out_buf;
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const gboolean has_mask = mask != NULL;
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while (samples--)
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{
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out[RED] = in[RED];
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out[GREEN] = in[GREEN];
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out[BLUE] = in[BLUE];
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out[ALPHA] = in[ALPHA];
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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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