src/util/common.c (raw)
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/************************************************************************** * * 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_asb(DATA32 *data, int w, int h, int alpha, float satur, float bright) { unsigned int x, y; unsigned int a, r, g, b, argb; unsigned long id; int cmax, cmin; float h2, f, p, q, t; float hue, saturation, brightness; float redc, greenc, bluec; for(y = 0; y < h; y++) { for(id = y * w, x = 0; x < w; x++, id++) { argb = data[id]; a = (argb >> 24) & 0xff; // transparent => nothing to do. if (a == 0) continue; 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; if (alpha != 100) a = (a * alpha)/100; // 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; data[id] = argb; } } } |