162 lines
5.6 KiB
C
162 lines
5.6 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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* pikaoperationsoftlightmode.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 <gegl-plugin.h>
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#include "../operations-types.h"
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#include "pikaoperationsoftlightlegacy.h"
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static gboolean pika_operation_softlight_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 (PikaOperationSoftlightLegacy, pika_operation_softlight_legacy,
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PIKA_TYPE_OPERATION_LAYER_MODE)
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static const gchar* reference_xml = "<?xml version='1.0' encoding='UTF-8'?>"
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"<gegl>"
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"<node operation='pika:softlight-legacy'>"
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" <node operation='gegl:load'>"
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" <params>"
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" <param name='path'>B.png</param>"
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" </params>"
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" </node>"
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"</node>"
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"<node operation='gegl:load'>"
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" <params>"
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" <param name='path'>A.png</param>"
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" </params>"
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"</node>"
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"</gegl>";
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static void
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pika_operation_softlight_legacy_class_init (PikaOperationSoftlightLegacyClass *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:softlight-legacy",
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"description", "PIKA softlight mode operation",
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"reference-image", "soft-light-mode.png",
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"reference-composition", reference_xml,
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NULL);
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layer_mode_class->process = pika_operation_softlight_legacy_process;
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}
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static void
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pika_operation_softlight_legacy_init (PikaOperationSoftlightLegacy *self)
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{
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}
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static gboolean
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pika_operation_softlight_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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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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gfloat ratio = comp_alpha / new_alpha;
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gint b;
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for (b = RED; b < ALPHA; b++)
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{
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#if 0
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/* softlight is now used for what PIKA formerly called
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* OVERLAY. We fixed OVERLAY to use the right math
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* (under the name NEW_OVERLAY), and redirect uses of
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* the old OVERLAY blend mode here. This math was
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* formerly used for OVERLAY and is exactly the same as
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* the multiply, screen, comp math used below.
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* See bug #673501.
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*/
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gfloat comp = in[b] * (in[b] + (2.0f * layer[b]) * (1.0f - in[b]));
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#endif
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gfloat multiply = in[b] * layer[b];
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gfloat screen = 1.0f - (1.0f - in[b]) * (1.0f - layer[b]);
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gfloat comp = (1.0f - in[b]) * multiply + in[b] * screen;
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out[b] = comp * 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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