mirror of https://github.com/GNOME/gimp.git
113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
/* The GIMP -- an image manipulation program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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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 2 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <glib-object.h>
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#include "core-types.h"
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#include "base/pixel-processor.h"
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#include "base/pixel-region.h"
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#include "gimpdrawable.h"
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#include "gimpdrawable-desaturate.h"
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#include "gimpimage.h"
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#include "gimp-intl.h"
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static void desaturate_region (gpointer data,
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PixelRegion *srcPR,
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PixelRegion *destPR);
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void
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gimp_drawable_desaturate (GimpDrawable *drawable)
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{
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PixelRegion srcPR, destPR;
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gint x, y, width, height;
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gboolean has_alpha;
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g_return_if_fail (GIMP_IS_DRAWABLE (drawable));
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g_return_if_fail (gimp_drawable_is_rgb (drawable));
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g_return_if_fail (gimp_item_is_attached (GIMP_ITEM (drawable)));
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has_alpha = gimp_drawable_has_alpha (drawable);
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if (! gimp_drawable_mask_intersect (drawable, &x, &y, &width, &height))
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return;
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pixel_region_init (&srcPR, gimp_drawable_data (drawable),
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x, y, width, height, FALSE);
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pixel_region_init (&destPR, gimp_drawable_shadow (drawable),
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x, y, width, height, TRUE);
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pixel_regions_process_parallel ((PixelProcessorFunc) desaturate_region,
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GINT_TO_POINTER (has_alpha),
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2, &srcPR, &destPR);
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gimp_drawable_merge_shadow (drawable, TRUE, _("Desaturate"));
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gimp_drawable_update (drawable, x, y, width, height);
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}
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static void
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desaturate_region (gpointer data,
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PixelRegion *srcPR,
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PixelRegion *destPR)
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{
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const guchar *src = srcPR->data;
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guchar *dest = destPR->data;
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gint h = srcPR->h;
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gboolean has_alpha = GPOINTER_TO_INT (data);
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while (h--)
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{
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const guchar *s = src;
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guchar *d = dest;
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gint j;
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for (j = 0; j < srcPR->w; j++)
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{
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gint min, max;
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gint lightness;
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max = MAX (s[RED_PIX], s[GREEN_PIX]);
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max = MAX (max, s[BLUE_PIX]);
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min = MIN (s[RED_PIX], s[GREEN_PIX]);
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min = MIN (min, s[BLUE_PIX]);
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lightness = (max + min) / 2;
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d[RED_PIX] = lightness;
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d[GREEN_PIX] = lightness;
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d[BLUE_PIX] = lightness;
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if (has_alpha)
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d[ALPHA_PIX] = s[ALPHA_PIX];
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d += destPR->bytes;
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s += srcPR->bytes;
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}
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src += srcPR->rowstride;
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dest += destPR->rowstride;
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}
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}
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