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app: added gegl version of color erase mode

This commit is contained in:
Ville Sokk 2012-05-31 22:05:28 +03:00
parent 321a113212
commit 8079285c91
1 changed files with 102 additions and 8 deletions
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102
app/operations/gimpoperationcolorerasemode.c
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@ -3,6 +3,7 @@
*
* gimpoperationcolorerasemode.c
* Copyright (C) 2008 Michael Natterer <mitch@gimp.org>
* 2012 Ville Sokk <ville.sokk@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -21,13 +22,18 @@
#include "config.h"
#include <cairo.h>
#include <gegl-plugin.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "libgimpcolor/gimpcolor.h"
#include "operations-types.h"
#include "gimpoperationcolorerasemode.h"
static void gimp_operation_color_erase_mode_prepare (GeglOperation *operation);
static gboolean gimp_operation_color_erase_mode_process (GeglOperation *operation,
void *in_buf,
void *aux_buf,
@ -56,6 +62,7 @@ gimp_operation_color_erase_mode_class_init (GimpOperationColorEraseModeClass *kl
"description", "GIMP color erase mode operation",
NULL);
operation_class->prepare = gimp_operation_color_erase_mode_prepare;
point_class->process = gimp_operation_color_erase_mode_process;
}
@ -64,6 +71,17 @@ gimp_operation_color_erase_mode_init (GimpOperationColorEraseMode *self)
{
}
static void
gimp_operation_color_erase_mode_prepare (GeglOperation *operation)
{
const Babl *format = babl_format ("R'G'B'A float");
gegl_operation_set_format (operation, "input", format);
gegl_operation_set_format (operation, "aux", format);
gegl_operation_set_format (operation, "aux2", babl_format ("Y float"));
gegl_operation_set_format (operation, "output", format);
}
static gboolean
gimp_operation_color_erase_mode_process (GeglOperation *operation,
void *in_buf,
@ -74,21 +92,97 @@ gimp_operation_color_erase_mode_process (GeglOperation *operation,
const GeglRectangle *roi,
gint level)
{
gdouble opacity = GIMP_OPERATION_POINT_LAYER_MODE (operation)->opacity;
gfloat *in = in_buf;
gfloat *layer = aux_buf;
gfloat *mask = aux2_buf;
gfloat *out = out_buf;
const gboolean has_mask = mask != NULL;
while (samples--)
{
out[RED] = in[RED];
out[GREEN] = in[GREEN];
out[BLUE] = in[BLUE];
out[ALPHA] = in[ALPHA];
gfloat layer_alpha;
GimpRGB bgcolor, color, alpha;
layer_alpha = layer[ALPHA] * opacity;
if (has_mask)
layer_alpha *= *mask;
gimp_rgba_set (&color, in[0], in[1], in[2], in[3]);
gimp_rgba_set (&bgcolor, layer[0], layer[1], layer[2], layer_alpha);
/* start of helper function copied from legacy 8-bit blending code */
alpha.a = color.a;
if (bgcolor.r < 0.0001)
alpha.r = color.r;
else if ( color.r > bgcolor.r )
alpha.r = (color.r - bgcolor.r) / (1.0 - bgcolor.r);
else if (color.r < bgcolor.r)
alpha.r = (bgcolor.r - color.r) / bgcolor.r;
else alpha.r = 0.0;
if (bgcolor.g < 0.0001)
alpha.g = color.g;
else if ( color.g > bgcolor.g )
alpha.g = (color.g - bgcolor.g) / (1.0 - bgcolor.g);
else if ( color.g < bgcolor.g )
alpha.g = (bgcolor.g - color.g) / (bgcolor.g);
else alpha.g = 0.0;
if (bgcolor.b < 0.0001)
alpha.b = color.b;
else if ( color.b > bgcolor.b )
alpha.b = (color.b - bgcolor.b) / (1.0 - bgcolor.b);
else if ( color.b < bgcolor.b )
alpha.b = (bgcolor.b - color.b) / (bgcolor.b);
else alpha.b = 0.0;
if ( alpha.r > alpha.g )
{
if ( alpha.r > alpha.b )
{
color.a = alpha.r;
}
else
{
color.a = alpha.b;
}
}
else if ( alpha.g > alpha.b )
{
color.a = alpha.g;
}
else
{
color.a = alpha.b;
}
color.a = (1.0 - bgcolor.a) + (color.a * bgcolor.a);
if (color.a > 0.0001)
{
color.r = (color.r - bgcolor.r) / color.a + bgcolor.r;
color.g = (color.g - bgcolor.g) / color.a + bgcolor.g;
color.b = (color.b - bgcolor.b) / color.a + bgcolor.b;
color.a *= alpha.a;
}
/* end of helper function */
out[0] = color.r;
out[1] = color.g;
out[2] = color.b;
out[3] = color.a;
in += 4;
layer += 4;
out += 4;
if (has_mask)
mask++;
}
return TRUE;
}