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/* GIMP - The GNU Image Manipulation Program
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* gimpoperationlayermode-composite.c
* Copyright (C) 2017 Michael Natterer <mitch@gimp.org>
* 2017 Øyvind Kolås <pippin@gimp.org>
* 2017 Ell
*
* 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
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <gegl-plugin.h>
#include <cairo.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "../operations-types.h"
#include "gimpoperationlayermode-composite.h"
/* non-subtractive compositing functions. these functions expect comp[ALPHA]
* to be the same as layer[ALPHA]. when in[ALPHA] or layer[ALPHA] are zero,
* the value of comp[RED..BLUE] is unconstrained (in particular, it may be
* NaN).
*/
void
gimp_operation_layer_mode_composite_union (const gfloat *in,
const gfloat *layer,
const gfloat *comp,
const gfloat *mask,
gfloat opacity,
gfloat *out,
gint samples)
{
while (samples--)
{
gfloat new_alpha;
gfloat in_alpha = in[ALPHA];
gfloat layer_alpha = layer[ALPHA] * opacity;
if (mask)
layer_alpha *= *mask;
new_alpha = layer_alpha + (1.0f - layer_alpha) * in_alpha;
if (layer_alpha == 0.0f || new_alpha == 0.0f)
{
out[RED] = in[RED];
out[GREEN] = in[GREEN];
out[BLUE] = in[BLUE];
}
else if (in_alpha == 0.0f)
{
out[RED] = layer[RED];
out[GREEN] = layer[GREEN];
out[BLUE] = layer[BLUE];
}
else
{
gfloat ratio = layer_alpha / new_alpha;
gint b;
for (b = RED; b < ALPHA; b++)
out[b] = ratio * (in_alpha * (comp[b] - layer[b]) + layer[b] - in[b]) + in[b];
}
out[ALPHA] = new_alpha;
in += 4;
layer += 4;
comp += 4;
out += 4;
if (mask)
mask++;
}
}
void
gimp_operation_layer_mode_composite_clip_to_backdrop (const gfloat *in,
const gfloat *layer,
const gfloat *comp,
const gfloat *mask,
gfloat opacity,
gfloat *out,
gint samples)
{
while (samples--)
{
gfloat layer_alpha = comp[ALPHA] * opacity;
if (mask)
layer_alpha *= *mask;
if (in[ALPHA] == 0.0f || layer_alpha == 0.0f)
{
out[RED] = in[RED];
out[GREEN] = in[GREEN];
out[BLUE] = in[BLUE];
}
else
{
gint b;
for (b = RED; b < ALPHA; b++)
out[b] = comp[b] * layer_alpha + in[b] * (1.0f - layer_alpha);
}
out[ALPHA] = in[ALPHA];
in += 4;
comp += 4;
out += 4;
if (mask)
mask++;
}
}
void
gimp_operation_layer_mode_composite_clip_to_layer (const gfloat *in,
const gfloat *layer,
const gfloat *comp,
const gfloat *mask,
gfloat opacity,
gfloat *out,
gint samples)
{
while (samples--)
{
gfloat layer_alpha = layer[ALPHA] * opacity;
if (mask)
layer_alpha *= *mask;
if (layer_alpha == 0.0f)
{
out[RED] = in[RED];
out[GREEN] = in[GREEN];
out[BLUE] = in[BLUE];
}
else if (in[ALPHA] == 0.0f)
{
out[RED] = layer[RED];
out[GREEN] = layer[GREEN];
out[BLUE] = layer[BLUE];
}
else
{
gint b;
for (b = RED; b < ALPHA; b++)
out[b] = comp[b] * in[ALPHA] + layer[b] * (1.0f - in[ALPHA]);
}
out[ALPHA] = layer_alpha;
in += 4;
layer += 4;
comp += 4;
out += 4;
if (mask)
mask++;
}
}
void
gimp_operation_layer_mode_composite_intersection (const gfloat *in,
const gfloat *layer,
const gfloat *comp,
const gfloat *mask,
gfloat opacity,
gfloat *out,
gint samples)
{
while (samples--)
{
gfloat new_alpha = in[ALPHA] * comp[ALPHA] * opacity;
if (mask)
new_alpha *= *mask;
if (new_alpha == 0.0f)
{
out[RED] = in[RED];
out[GREEN] = in[GREEN];
out[BLUE] = in[BLUE];
}
else
{
out[RED] = comp[RED];
out[GREEN] = comp[GREEN];
out[BLUE] = comp[BLUE];
}
out[ALPHA] = new_alpha;
in += 4;
comp += 4;
out += 4;
if (mask)
mask++;
}
}
/* subtractive compositing functions. these functions expect comp[ALPHA] to
* specify the modified alpha of the overlapping content, as a fraction of the
* original overlapping content (i.e., an alpha of 1.0 specifies that no
* content is subtracted.) when in[ALPHA] or layer[ALPHA] are zero, the value
* of comp[RED..BLUE] is unconstrained (in particular, it may be NaN).
*/
void
gimp_operation_layer_mode_composite_union_sub (const gfloat *in,
const gfloat *layer,
const gfloat *comp,
const gfloat *mask,
gfloat opacity,
gfloat *out,
gint samples)
{
while (samples--)
{
gfloat in_alpha = in[ALPHA];
gfloat layer_alpha = layer[ALPHA] * opacity;
gfloat comp_alpha = comp[ALPHA];
gfloat new_alpha;
if (mask)
layer_alpha *= *mask;
new_alpha = in_alpha + layer_alpha -
(2.0f - comp_alpha) * in_alpha * layer_alpha;
if (layer_alpha == 0.0f || new_alpha == 0.0f)
{
out[RED] = in[RED];
out[GREEN] = in[GREEN];
out[BLUE] = in[BLUE];
}
else if (in_alpha == 0.0f)
{
out[RED] = layer[RED];
out[GREEN] = layer[GREEN];
out[BLUE] = layer[BLUE];
}
else
{
gfloat ratio = in_alpha / new_alpha;
gfloat layer_coeff = 1.0f / in_alpha - 1.0f;
gint b;
for (b = RED; b < ALPHA; b++)
out[b] = ratio * (layer_alpha * (comp_alpha * comp[b] + layer_coeff * layer[b] - in[b]) + in[b]);
}
out[ALPHA] = new_alpha;
in += 4;
layer += 4;
comp += 4;
out += 4;
if (mask)
mask++;
}
}
void
gimp_operation_layer_mode_composite_clip_to_backdrop_sub (const gfloat *in,
const gfloat *layer,
const gfloat *comp,
const gfloat *mask,
gfloat opacity,
gfloat *out,
gint samples)
{
while (samples--)
{
gfloat layer_alpha = layer[ALPHA] * opacity;
gfloat comp_alpha = comp[ALPHA];
gfloat new_alpha;
if (mask)
layer_alpha *= *mask;
comp_alpha *= layer_alpha;
new_alpha = 1.0f - layer_alpha + comp_alpha;
if (in[ALPHA] == 0.0f || comp_alpha == 0.0f)
{
out[RED] = in[RED];
out[GREEN] = in[GREEN];
out[BLUE] = in[BLUE];
}
else
{
gfloat ratio = comp_alpha / new_alpha;
gint b;
for (b = RED; b < ALPHA; b++)
out[b] = comp[b] * ratio + in[b] * (1.0f - ratio);
}
new_alpha *= in[ALPHA];
out[ALPHA] = new_alpha;
in += 4;
layer += 4;
comp += 4;
out += 4;
if (mask)
mask++;
}
}
void
gimp_operation_layer_mode_composite_clip_to_layer_sub (const gfloat *in,
const gfloat *layer,
const gfloat *comp,
const gfloat *mask,
gfloat opacity,
gfloat *out,
gint samples)
{
while (samples--)
{
gfloat in_alpha = in[ALPHA];
gfloat layer_alpha = layer[ALPHA] * opacity;
gfloat comp_alpha = comp[ALPHA];
gfloat new_alpha;
if (mask)
layer_alpha *= *mask;
comp_alpha *= in_alpha;
new_alpha = 1.0f - in_alpha + comp_alpha;
if (layer_alpha == 0.0f)
{
out[RED] = in[RED];
out[GREEN] = in[GREEN];
out[BLUE] = in[BLUE];
}
else if (in_alpha == 0.0f)
{
out[RED] = layer[RED];
out[GREEN] = layer[GREEN];
out[BLUE] = layer[BLUE];
}
else
{
gfloat ratio = comp_alpha / new_alpha;
gint b;
for (b = RED; b < ALPHA; b++)
out[b] = comp[b] * ratio + layer[b] * (1.0f - ratio);
}
new_alpha *= layer_alpha;
out[ALPHA] = new_alpha;
in += 4;
layer += 4;
comp += 4;
out += 4;
if (mask)
mask++;
}
}
void
gimp_operation_layer_mode_composite_intersection_sub (const gfloat *in,
const gfloat *layer,
const gfloat *comp,
const gfloat *mask,
gfloat opacity,
gfloat *out,
gint samples)
{
while (samples--)
{
gfloat new_alpha = in[ALPHA] * layer[ALPHA] * comp[ALPHA] * opacity;
if (mask)
new_alpha *= *mask;
if (new_alpha == 0.0f)
{
out[RED] = in[RED];
out[GREEN] = in[GREEN];
out[BLUE] = in[BLUE];
}
else
{
out[RED] = comp[RED];
out[GREEN] = comp[GREEN];
out[BLUE] = comp[BLUE];
}
out[ALPHA] = new_alpha;
in += 4;
layer += 4;
comp += 4;
out += 4;
if (mask)
mask++;
}
}
|
