From 883046095800fc78649d943d2b0da22f8732d31e Mon Sep 17 00:00:00 2001 From: Thierry Lorthiois Date: Sat, 29 Aug 2009 12:00:53 +0000 Subject: [PATCH] adjust saturation/brightness 2 --- src/util/common.c | 142 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 142 insertions(+) create mode 100644 src/util/common.c diff --git a/src/util/common.c b/src/util/common.c new file mode 100644 index 0000000..31c2d2e --- /dev/null +++ b/src/util/common.c @@ -0,0 +1,142 @@ +/************************************************************************** +* +* Tint2 : common windows function +* +* Copyright (C) 2007 PÃ¥l 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 +#include +#include +#include +#include +#include + + +#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; + } + } +} + + -- 2.45.2