mirror of
https://gitlab.gnome.org/GNOME/gimp
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4f870bc132
2005-08-03 Sven Neumann <sven@gimp.org> * libgimpcolor/gimprgb.[ch]: deprecated RGB intensity functions and definitions. These coefficients do not accurately compute luminance for contemporary monitors. Instead the coefficients from the sRGB spec should be used which have now been added. * libgimpcolor/gimpcolor.def: updated. * libgimp/gimpdrawable.c * libgimp/gimppixelfetcher.c * app/base/colorize.c * app/base/levels.c * app/base/temp-buf.c * app/core/gimpdrawable-blend.c * app/core/gimpdrawable-convert.c * app/core/gimpdrawable-desaturate.c * app/core/gimpimage-convert.c * app/core/gimpimage.c * app/gui/splash.c * app/widgets/gimpgradienteditor.c * modules/colorsel_triangle.c * plug-ins/common/aa.c * plug-ins/common/bumpmap.c * plug-ins/common/colorify.c * plug-ins/common/despeckle.c * plug-ins/common/displace.c * plug-ins/common/engrave.c * plug-ins/common/gradmap.c * plug-ins/common/grid.c * plug-ins/common/mng.c * plug-ins/common/newsprint.c * plug-ins/common/png.c * plug-ins/common/whirlpinch.c * plug-ins/gflare/gflare.c * plug-ins/gfli/gfli.c * plug-ins/maze/handy.c * plug-ins/pagecurl/pagecurl.c: use gimp_rgb_luminance() and friends instead of the deprecated intensity functions.
219 lines
6 KiB
C
219 lines
6 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 "libgimpcolor/gimpcolor.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_lightness (gpointer data,
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PixelRegion *srcPR,
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PixelRegion *destPR);
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static void desaturate_region_luminosity (gpointer data,
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PixelRegion *srcPR,
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PixelRegion *destPR);
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static void desaturate_region_average (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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GimpDesaturateMode mode)
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{
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PixelRegion srcPR, destPR;
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PixelProcessorFunc function;
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gint x, y;
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gint 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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if (! gimp_drawable_mask_intersect (drawable, &x, &y, &width, &height))
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return;
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switch (mode)
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{
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case GIMP_DESATURATE_LIGHTNESS:
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function = (PixelProcessorFunc) desaturate_region_lightness;
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break;
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break;
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case GIMP_DESATURATE_LUMINOSITY:
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function = (PixelProcessorFunc) desaturate_region_luminosity;
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break;
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case GIMP_DESATURATE_AVERAGE:
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function = (PixelProcessorFunc) desaturate_region_average;
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break;
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default:
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g_return_if_reached ();
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return;
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}
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has_alpha = gimp_drawable_has_alpha (drawable);
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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 (function, 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_lightness (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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static void
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desaturate_region_luminosity (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 luminosity = GIMP_RGB_LUMINANCE (s[RED_PIX],
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s[GREEN_PIX],
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s[BLUE_PIX]) + 0.5;
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d[RED_PIX] = luminosity;
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d[GREEN_PIX] = luminosity;
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d[BLUE_PIX] = luminosity;
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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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static void
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desaturate_region_average (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 average = (s[RED_PIX] + s[GREEN_PIX] + s[BLUE_PIX] + 1) / 3;
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d[RED_PIX] = average;
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d[GREEN_PIX] = average;
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d[BLUE_PIX] = average;
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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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