A src/util/common.c

@@ -0,0 +1,142 @@
+/**************************************************************************
+*
+* Tint2 : common windows function
+*
+* Copyright (C) 2007 Pål Staurland (staura@gmail.com)
+* Modified (C) 2008 thierry lorthiois (lorthiois@bbsoft.fr)
+*
+* This program is free software; you can redistribute it and/or
+* modify it under the terms of the GNU General Public License version 2
+* as published by the Free Software Foundation.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+* You should have received a copy of the GNU General Public License
+* along with this program; if not, write to the Free Software
+* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+**************************************************************************/
+
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/Xatom.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+#include "common.h"
+
+
+
+void adjust_hsb(unsigned int *data, int w, int h, float hu, float satur, float bright)
+{
+	unsigned int *pt = data;
+	int x, y;
+	unsigned int a, r, g, b, argb;
+	int cmax, cmin;
+	float h2, f, p, q, t;
+	float hue, saturation, brightness;
+	float redc, greenc, bluec;
+
+
+	for(y = 0; y < h; y++) {
+		for(x = 0; x < w; x++) {
+			argb = pt[y * h + x];
+			a = (argb >> 24) & 0xff;
+			r = (argb >> 16) & 0xff;
+			g = (argb >> 8) & 0xff;
+			b = (argb) & 0xff;
+
+			// convert RGB to HSB
+			cmax = (r > g) ? r : g;
+			if (b > cmax) cmax = b;
+			cmin = (r < g) ? r : g;
+			if (b < cmin) cmin = b;
+			brightness = ((float)cmax) / 255.0f;
+			if (cmax != 0)
+				saturation = ((float)(cmax - cmin)) / ((float)cmax);
+			else
+				saturation = 0;
+			if (saturation == 0)
+				hue = 0;
+			else {
+				redc = ((float)(cmax - r)) / ((float)(cmax - cmin));
+				greenc = ((float)(cmax - g)) / ((float)(cmax - cmin));
+				bluec = ((float)(cmax - b)) / ((float)(cmax - cmin));
+				if (r == cmax)
+					hue = bluec - greenc;
+				else if (g == cmax)
+					hue = 2.0f + redc - bluec;
+				else
+					hue = 4.0f + greenc - redc;
+				hue = hue / 6.0f;
+				if (hue < 0)
+					hue = hue + 1.0f;
+			}
+
+			// adjust
+			saturation += satur;
+			if (saturation < 0.0) saturation = 0.0;
+			if (saturation > 1.0) saturation = 1.0;
+			brightness += bright;
+			if (brightness < 0.0) brightness = 0.0;
+			if (brightness > 1.0) brightness = 1.0;
+			hue += hu;
+			if (hue < 0.0) hue = 0.0;
+			if (hue > 1.0) hue = 1.0;
+
+			// convert HSB to RGB
+			if (saturation == 0) {
+				r = g = b = (int)(brightness * 255.0f + 0.5f);
+			} else {
+				h2 = (hue - (int)hue) * 6.0f;
+				f = h2 - (int)(h2);
+				p = brightness * (1.0f - saturation);
+				q = brightness * (1.0f - saturation * f);
+				t = brightness * (1.0f - (saturation * (1.0f - f)));
+				switch ((int) h2) {
+				case 0:
+					r = (int)(brightness * 255.0f + 0.5f);
+					g = (int)(t * 255.0f + 0.5f);
+					b = (int)(p * 255.0f + 0.5f);
+					break;
+				case 1:
+					r = (int)(q * 255.0f + 0.5f);
+					g = (int)(brightness * 255.0f + 0.5f);
+					b = (int)(p * 255.0f + 0.5f);
+					break;
+				case 2:
+					r = (int)(p * 255.0f + 0.5f);
+					g = (int)(brightness * 255.0f + 0.5f);
+					b = (int)(t * 255.0f + 0.5f);
+					break;
+				case 3:
+					r = (int)(p * 255.0f + 0.5f);
+					g = (int)(q * 255.0f + 0.5f);
+					b = (int)(brightness * 255.0f + 0.5f);
+					break;
+				case 4:
+					r = (int)(t * 255.0f + 0.5f);
+					g = (int)(p * 255.0f + 0.5f);
+					b = (int)(brightness * 255.0f + 0.5f);
+					break;
+				case 5:
+					r = (int)(brightness * 255.0f + 0.5f);
+					g = (int)(p * 255.0f + 0.5f);
+					b = (int)(q * 255.0f + 0.5f);
+					break;
+				}
+			}
+
+			argb = a;
+			argb = (argb << 8) + r;
+			argb = (argb << 8) + g;
+			argb = (argb << 8) + b;
+			pt[y * h + x] = argb;
+		}
+	}
+}
+
+