mirror of https://github.com/GNOME/gimp.git
160 lines
5.2 KiB
C
160 lines
5.2 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* gimpoperationhuemode.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 <http://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 "libgimpcolor/gimpcolor.h"
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#include "operations-types.h"
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#include "gimpoperationhuemode.h"
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static gboolean gimp_operation_hue_mode_process (GeglOperation *operation,
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void *in_buf,
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void *aux_buf,
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void *aux2_buf,
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void *out_buf,
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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 (GimpOperationHueMode, gimp_operation_hue_mode,
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GIMP_TYPE_OPERATION_POINT_LAYER_MODE)
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static void
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gimp_operation_hue_mode_class_init (GimpOperationHueModeClass *klass)
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{
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GeglOperationClass *operation_class;
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GeglOperationPointComposer3Class *point_class;
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operation_class = GEGL_OPERATION_CLASS (klass);
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point_class = GEGL_OPERATION_POINT_COMPOSER3_CLASS (klass);
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gegl_operation_class_set_keys (operation_class,
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"name", "gimp:hue-mode",
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"description", "GIMP hue mode operation",
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NULL);
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point_class->process = gimp_operation_hue_mode_process;
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}
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static void
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gimp_operation_hue_mode_init (GimpOperationHueMode *self)
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{
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}
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static gboolean
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gimp_operation_hue_mode_process (GeglOperation *operation,
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void *in_buf,
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void *aux_buf,
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void *aux2_buf,
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void *out_buf,
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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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gfloat opacity = GIMP_OPERATION_POINT_LAYER_MODE (operation)->opacity;
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return gimp_operation_hue_mode_process_pixels (in_buf, aux_buf, aux2_buf, out_buf, opacity, samples, roi, level);
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}
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gboolean
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gimp_operation_hue_mode_process_pixels (gfloat *in,
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gfloat *layer,
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gfloat *mask,
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gfloat *out,
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gfloat opacity,
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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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const gboolean has_mask = mask != NULL;
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while (samples--)
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{
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GimpHSV layer_hsv, out_hsv;
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GimpRGB layer_rgb = {layer[0], layer[1], layer[2]};
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GimpRGB 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 (has_mask)
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comp_alpha *= *mask;
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new_alpha = in[ALPHA] + (1.0 - 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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gimp_rgb_to_hsv (&layer_rgb, &layer_hsv);
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gimp_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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gimp_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] * (1.0 - 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 (has_mask)
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mask++;
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}
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return TRUE;
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}
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