0d5df41904
2004-11-16 Michael Natterer <mitch@gimp.org> * app/core/gimpchannel-select.c * app/core/gimpchannel.c * app/core/gimpdrawable-desaturate.c * app/core/gimpdrawable-equalize.c * app/core/gimpdrawable-histogram.c * app/core/gimpdrawable-invert.c * app/core/gimpdrawable-levels.c * app/core/gimpdrawable-offset.c * app/core/gimpdrawable-stroke.c * app/core/gimpdrawable-transform.c * app/core/gimpdrawable.c * app/core/gimpitem-linked.c * app/core/gimpitem.c * app/core/gimplayer.c * app/core/gimpselection.c * app/paint/gimppaintcore-stroke.c * app/text/gimptextlayer.c: in all functions which somehow (explicitely or implicitely) touch undo, either g_return_if_fail() on gimp_item_is_attached() or simply don't push an undo step if feasible (e.g. for simple stuff like layer opacity). * tools/pdbgen/pdb/color.pdb * tools/pdbgen/pdb/drawable.pdb * tools/pdbgen/pdb/image.pdb * tools/pdbgen/pdb/layer.pdb * tools/pdbgen/pdb/paint_tools.pdb: let PDB wrappers fail accordingly so they don't run into the assertions added above. * app/pdb/color_cmds.c * app/pdb/drawable_cmds.c * app/pdb/image_cmds.c * app/pdb/layer_cmds.c * app/pdb/paint_tools_cmds.c: regenerated.
101 lines
2.6 KiB
C
101 lines
2.6 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 "core-types.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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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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guchar *src, *s;
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guchar *dest, *d;
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gint h, j;
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gint lightness, min, max;
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gboolean has_alpha;
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gpointer pr;
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gint x, y, width, height;
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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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for (pr = pixel_regions_register (2, &srcPR, &destPR);
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pr != NULL;
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pr = pixel_regions_process (pr))
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{
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src = srcPR.data;
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dest = destPR.data;
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h = srcPR.h;
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while (h--)
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{
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s = src;
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d = dest;
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for (j = 0; j < srcPR.w; j++)
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{
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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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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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