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