mirror of https://github.com/GNOME/gimp.git
134 lines
3.4 KiB
C
134 lines
3.4 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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* 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 <glib-object.h>
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#include "libgimpcolor/gimpcolor.h"
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#include "libgimpmath/gimpmath.h"
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#include "base-types.h"
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#include "colorize.h"
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#include "pixel-region.h"
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void
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colorize_init (Colorize *colorize)
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{
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gint i;
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g_return_if_fail (colorize != NULL);
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colorize->hue = 180.0;
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colorize->saturation = 50.0;
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colorize->lightness = 0.0;
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for (i = 0; i < 256; i ++)
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{
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colorize->lum_red_lookup[i] = i * GIMP_RGB_LUMINANCE_RED;
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colorize->lum_green_lookup[i] = i * GIMP_RGB_LUMINANCE_GREEN;
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colorize->lum_blue_lookup[i] = i * GIMP_RGB_LUMINANCE_BLUE;
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}
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}
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void
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colorize_calculate (Colorize *colorize)
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{
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GimpHSL hsl;
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GimpRGB rgb;
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gint i;
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g_return_if_fail (colorize != NULL);
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hsl.h = colorize->hue / 360.0;
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hsl.s = colorize->saturation / 100.0;
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/* Calculate transfers */
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for (i = 0; i < 256; i ++)
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{
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hsl.l = (gdouble) i / 255.0;
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gimp_hsl_to_rgb (&hsl, &rgb);
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/* this used to read i * rgb.r,g,b in GIMP 2.4, but this produced
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* darkened results, multiplying with 255 is correct and preserves
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* the lightness unless modified with the slider.
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*/
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colorize->final_red_lookup[i] = 255.0 * rgb.r;
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colorize->final_green_lookup[i] = 255.0 * rgb.g;
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colorize->final_blue_lookup[i] = 255.0 * rgb.b;
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}
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}
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void
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colorize (Colorize *colorize,
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PixelRegion *srcPR,
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PixelRegion *destPR)
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{
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const guchar *src, *s;
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guchar *dest, *d;
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gboolean alpha;
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gint w, h;
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gint lum;
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/* Set the transfer arrays (for speed) */
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h = srcPR->h;
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src = srcPR->data;
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dest = destPR->data;
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alpha = (srcPR->bytes == 4) ? TRUE : FALSE;
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while (h--)
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{
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w = srcPR->w;
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s = src;
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d = dest;
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while (w--)
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{
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lum = (colorize->lum_red_lookup[s[RED]] +
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colorize->lum_green_lookup[s[GREEN]] +
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colorize->lum_blue_lookup[s[BLUE]]); /* luminosity */
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if (colorize->lightness > 0)
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{
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lum = (gdouble) lum * (100.0 - colorize->lightness) / 100.0;
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lum += 255 - (100.0 - colorize->lightness) * 255.0 / 100.0;
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}
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else if (colorize->lightness < 0)
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{
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lum = (gdouble) lum * (colorize->lightness + 100.0) / 100.0;
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}
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d[RED] = colorize->final_red_lookup[lum];
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d[GREEN] = colorize->final_green_lookup[lum];
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d[BLUE] = colorize->final_blue_lookup[lum];
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if (alpha)
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d[ALPHA] = s[ALPHA];
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s += srcPR->bytes;
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d += destPR->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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