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19202fd2db
This patch is just adding a single header, but because it also modifies all the C files to add the #include, it was made as a patch on its own to ease review. Signed-off-by: Christophe CURIS <christophe.curis@free.fr>
131 lines
2.6 KiB
C
131 lines
2.6 KiB
C
/* color.c - color stuff (rgb -> hsv convertion etc.)
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*
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* Raster graphics library
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*
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* Copyright (c) 1998-2003 Alfredo K. Kojima
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <X11/Xlib.h>
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#include <assert.h>
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#include "wraster.h"
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#include "wr_i18n.h"
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#define MIN(a,b) ((a)<(b) ? (a) : (b))
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#define MAX(a,b) ((a)>(b) ? (a) : (b))
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#define MIN3(a,b,c) MIN(MIN(a,b), c)
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#define MAX3(a,b,c) MAX(MAX(a,b), c)
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void RHSVtoRGB(const RHSVColor * hsv, RColor * rgb)
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{
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int h = hsv->hue % 360;
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int s = hsv->saturation;
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int v = hsv->value;
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int i, f;
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int p, q, t;
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if (s == 0) {
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rgb->red = rgb->green = rgb->blue = v;
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return;
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}
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i = h / 60;
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f = h % 60;
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p = v * (255 - s) / 255;
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q = v * (255 - s * f / 60) / 255;
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t = v * (255 - s * (60 - f) / 60) / 255;
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switch (i) {
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case 0:
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rgb->red = v;
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rgb->green = t;
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rgb->blue = p;
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break;
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case 1:
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rgb->red = q;
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rgb->green = v;
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rgb->blue = p;
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break;
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case 2:
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rgb->red = p;
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rgb->green = v;
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rgb->blue = t;
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break;
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case 3:
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rgb->red = p;
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rgb->green = q;
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rgb->blue = v;
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break;
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case 4:
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rgb->red = t;
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rgb->green = p;
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rgb->blue = v;
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break;
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case 5:
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rgb->red = v;
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rgb->green = p;
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rgb->blue = q;
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break;
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}
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}
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void RRGBtoHSV(const RColor * rgb, RHSVColor * hsv)
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{
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int h, s, v;
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int max = MAX3(rgb->red, rgb->green, rgb->blue);
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int min = MIN3(rgb->red, rgb->green, rgb->blue);
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v = max;
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if (max == 0)
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s = 0;
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else
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s = (max - min) * 255 / max;
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if (s == 0)
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h = 0;
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else {
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int rc, gc, bc;
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rc = (max - rgb->red) * 255 / (max - min);
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gc = (max - rgb->green) * 255 / (max - min);
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bc = (max - rgb->blue) * 255 / (max - min);
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if (rgb->red == max) {
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h = ((bc - gc) * 60 / 255);
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} else if (rgb->green == max) {
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h = 2 * 60 + ((rc - bc) * 60 / 255);
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} else {
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h = 4 * 60 + ((gc - rc) * 60 / 255);
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}
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if (h < 0)
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h += 360;
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}
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hsv->hue = h;
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hsv->saturation = s;
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hsv->value = v;
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}
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