PIKApp/app/operations/layer-modes-legacy/pikaoperationhsvhuelegacy.c

151 lines
5.0 KiB
C
Raw Normal View History

2023-09-26 00:35:21 +02:00
/* PIKA - Photo and Image Kooker Application
* a rebranding of The GNU Image Manipulation Program (created with heckimp)
* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
*
* Original copyright, applying to most contents (license remains unchanged):
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
*
* pikaoperationhuemode.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
* 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 <cairo.h>
#include <gegl-plugin.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "libpikacolor/pikacolor.h"
#include "../operations-types.h"
#include "pikaoperationhsvhuelegacy.h"
static gboolean pika_operation_hsv_hue_legacy_process (GeglOperation *op,
void *in,
void *layer,
void *mask,
void *out,
glong samples,
const GeglRectangle *roi,
gint level);
G_DEFINE_TYPE (PikaOperationHsvHueLegacy, pika_operation_hsv_hue_legacy,
PIKA_TYPE_OPERATION_LAYER_MODE)
static void
pika_operation_hsv_hue_legacy_class_init (PikaOperationHsvHueLegacyClass *klass)
{
GeglOperationClass *operation_class = GEGL_OPERATION_CLASS (klass);
PikaOperationLayerModeClass *layer_mode_class = PIKA_OPERATION_LAYER_MODE_CLASS (klass);
gegl_operation_class_set_keys (operation_class,
"name", "pika:hsv-hue-legacy",
"description", "PIKA hue mode operation",
NULL);
layer_mode_class->process = pika_operation_hsv_hue_legacy_process;
}
static void
pika_operation_hsv_hue_legacy_init (PikaOperationHsvHueLegacy *self)
{
}
static gboolean
pika_operation_hsv_hue_legacy_process (GeglOperation *op,
void *in_p,
void *layer_p,
void *mask_p,
void *out_p,
glong samples,
const GeglRectangle *roi,
gint level)
{
PikaOperationLayerMode *layer_mode = (gpointer) op;
gfloat *in = in_p;
gfloat *out = out_p;
gfloat *layer = layer_p;
gfloat *mask = mask_p;
gfloat opacity = layer_mode->opacity;
while (samples--)
{
PikaHSV layer_hsv, out_hsv;
PikaRGB layer_rgb = {layer[0], layer[1], layer[2]};
PikaRGB out_rgb = {in[0], in[1], in[2]};
gfloat comp_alpha, new_alpha;
comp_alpha = MIN (in[ALPHA], layer[ALPHA]) * opacity;
if (mask)
comp_alpha *= *mask;
new_alpha = in[ALPHA] + (1.0f - in[ALPHA]) * comp_alpha;
if (comp_alpha && new_alpha)
{
gint b;
gfloat out_tmp[3];
gfloat ratio = comp_alpha / new_alpha;
pika_rgb_to_hsv (&layer_rgb, &layer_hsv);
pika_rgb_to_hsv (&out_rgb, &out_hsv);
/* Composition should have no effect if saturation is zero.
* otherwise, black would be painted red (see bug #123296).
*/
if (layer_hsv.s)
{
out_hsv.h = layer_hsv.h;
}
pika_hsv_to_rgb (&out_hsv, &out_rgb);
out_tmp[0] = out_rgb.r;
out_tmp[1] = out_rgb.g;
out_tmp[2] = out_rgb.b;
for (b = RED; b < ALPHA; b++)
{
out[b] = out_tmp[b] * ratio + in[b] * (1.0f - ratio);
}
}
else
{
gint b;
for (b = RED; b < ALPHA; b++)
{
out[b] = in[b];
}
}
out[ALPHA] = in[ALPHA];
in += 4;
layer += 4;
out += 4;
if (mask)
mask++;
}
return TRUE;
}