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/* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
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color.c for the Openbox window manager
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Copyright (c) 2006 Mikael Magnusson
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Copyright (c) 2003-2007 Dana Jansens
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Copyright (c) 2003 Derek Foreman
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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 2 of the License, or
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(at your option) any later version.
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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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See the COPYING file for a copy of the GNU General Public License.
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#include <X11/Xutil.h>
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void RrColorAllocateGC(RrColor *in)
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gcv.foreground = in->pixel;
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gcv.cap_style = CapProjecting;
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in->gc = XCreateGC(RrDisplay(in->inst),
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RrRootWindow(in->inst),
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GCForeground | GCCapStyle, &gcv);
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RrColor *RrColorParse(const RrInstance *inst, gchar *colorname)
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g_assert(colorname != NULL);
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/* get rgb values from colorname */
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if (!XParseColor(RrDisplay(inst), RrColormap(inst), colorname, &xcol)) {
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g_message("Unable to parse color '%s'", colorname);
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return RrColorNew(inst, xcol.red >> 8, xcol.green >> 8, xcol.blue >> 8);
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/*#define NO_COLOR_CACHE*/
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RrColor *RrColorNew(const RrInstance *inst, gint r, gint g, gint b)
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/* this should be replaced with something far cooler */
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g_assert(r >= 0 && r < 256);
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g_assert(g >= 0 && g < 256);
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g_assert(b >= 0 && b < 256);
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key = (r << 24) + (g << 16) + (b << 8);
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#ifndef NO_COLOR_CACHE
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if ((out = g_hash_table_lookup(RrColorHash(inst), &key))) {
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xcol.red = (r << 8) | r;
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xcol.green = (g << 8) | g;
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xcol.blue = (b << 8) | b;
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if (XAllocColor(RrDisplay(inst), RrColormap(inst), &xcol)) {
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out = g_new(RrColor, 1);
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out->r = xcol.red >> 8;
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out->g = xcol.green >> 8;
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out->b = xcol.blue >> 8;
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out->pixel = xcol.pixel;
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#ifndef NO_COLOR_CACHE
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g_hash_table_insert(RrColorHash(inst), &out->key, out);
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void RrColorFree(RrColor *c)
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if (--c->refcount < 1) {
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#ifndef NO_COLOR_CACHE
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g_assert(g_hash_table_lookup(RrColorHash(c->inst), &c->key));
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g_hash_table_remove(RrColorHash(c->inst), &c->key);
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if (c->pixel) XFreeColors(RrDisplay(c->inst), RrColormap(c->inst),
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if (c->gc) XFreeGC(RrDisplay(c->inst), c->gc);
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void RrReduceDepth(const RrInstance *inst, RrPixel32 *data, XImage *im)
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RrPixel32 *p32 = (RrPixel32 *) im->data;
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RrPixel16 *p16 = (RrPixel16 *) im->data;
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RrPixel8 *p8 = (RrPixel8 *) im->data;
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switch (im->bits_per_pixel) {
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if ((RrRedOffset(inst) != RrDefaultRedOffset) ||
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(RrBlueOffset(inst) != RrDefaultBlueOffset) ||
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(RrGreenOffset(inst) != RrDefaultGreenOffset)) {
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for (y = 0; y < im->height; y++) {
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for (x = 0; x < im->width; x++) {
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r = (data[x] >> RrDefaultRedOffset) & 0xFF;
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g = (data[x] >> RrDefaultGreenOffset) & 0xFF;
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b = (data[x] >> RrDefaultBlueOffset) & 0xFF;
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p32[x] = (r << RrRedOffset(inst))
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+ (g << RrGreenOffset(inst))
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+ (b << RrBlueOffset(inst));
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} else im->data = (gchar*) data;
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/* reverse the ordering, shifting left 16bit should be the first byte
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const guint roff = (16 - RrRedOffset(inst)) / 8;
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const guint goff = (16 - RrGreenOffset(inst)) / 8;
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const guint boff = (16 - RrBlueOffset(inst)) / 8;
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for (y = 0; y < im->height; y++) {
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for (x = 0, outx = 0; x < im->width; x++, outx += 3) {
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r = (data[x] >> RrDefaultRedOffset) & 0xFF;
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g = (data[x] >> RrDefaultGreenOffset) & 0xFF;
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b = (data[x] >> RrDefaultBlueOffset) & 0xFF;
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p8 += im->bytes_per_line;
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for (y = 0; y < im->height; y++) {
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for (x = 0; x < im->width; x++) {
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r = (data[x] >> RrDefaultRedOffset) & 0xFF;
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r = r >> RrRedShift(inst);
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g = (data[x] >> RrDefaultGreenOffset) & 0xFF;
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g = g >> RrGreenShift(inst);
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b = (data[x] >> RrDefaultBlueOffset) & 0xFF;
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b = b >> RrBlueShift(inst);
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p16[x] = (r << RrRedOffset(inst))
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+ (g << RrGreenOffset(inst))
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+ (b << RrBlueOffset(inst));
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p16 += im->bytes_per_line/2;
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if (RrVisual(inst)->class == TrueColor) {
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for (y = 0; y < im->height; y++) {
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for (x = 0; x < im->width; x++) {
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r = (data[x] >> RrDefaultRedOffset) & 0xFF;
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r = r >> RrRedShift(inst);
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g = (data[x] >> RrDefaultGreenOffset) & 0xFF;
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g = g >> RrGreenShift(inst);
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b = (data[x] >> RrDefaultBlueOffset) & 0xFF;
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b = b >> RrBlueShift(inst);
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p8[x] = (r << RrRedOffset(inst))
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+ (g << RrGreenOffset(inst))
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+ (b << RrBlueOffset(inst));
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p8 += im->bytes_per_line;
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for (y = 0; y < im->height; y++) {
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for (x = 0; x < im->width; x++) {
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p8[x] = RrPickColor(inst,
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data[x] >> RrDefaultRedOffset,
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data[x] >> RrDefaultGreenOffset,
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data[x] >> RrDefaultBlueOffset)->pixel;
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p8 += im->bytes_per_line;
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g_error("This image bit depth (%i) is currently unhandled", im->bits_per_pixel);
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XColor *RrPickColor(const RrInstance *inst, gint r, gint g, gint b)
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r = (r & 0xff) >> (8-RrPseudoBPC(inst));
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g = (g & 0xff) >> (8-RrPseudoBPC(inst));
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b = (b & 0xff) >> (8-RrPseudoBPC(inst));
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return &RrPseudoColors(inst)[(r << (2*RrPseudoBPC(inst))) +
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(g << (1*RrPseudoBPC(inst))) +
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static void swap_byte_order(XImage *im)
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for (y = 0; y < im->height; ++y) {
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for (x = 0; x < im->width; ++x) {
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gchar *c = &im->data[di + x * im->bits_per_pixel / 8];
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switch (im->bits_per_pixel) {
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g_error("Your bit depth (%i) is currently unhandled",
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di += im->bytes_per_line;
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if (im->byte_order == LSBFirst)
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im->byte_order = MSBFirst;
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im->byte_order = LSBFirst;
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void RrIncreaseDepth(const RrInstance *inst, RrPixel32 *data, XImage *im)
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RrPixel32 *p32 = (RrPixel32 *) im->data;
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RrPixel16 *p16 = (RrPixel16 *) im->data;
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guchar *p8 = (guchar *)im->data;
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if (im->byte_order != LSBFirst)
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switch (im->bits_per_pixel) {
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for (y = 0; y < im->height; y++) {
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for (x = 0; x < im->width; x++) {
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r = (p32[x] >> RrRedOffset(inst)) & 0xff;
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g = (p32[x] >> RrGreenOffset(inst)) & 0xff;
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b = (p32[x] >> RrBlueOffset(inst)) & 0xff;
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data[x] = (r << RrDefaultRedOffset)
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+ (g << RrDefaultGreenOffset)
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+ (b << RrDefaultBlueOffset)
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+ (0xff << RrDefaultAlphaOffset);
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p32 += im->bytes_per_line/4;
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for (y = 0; y < im->height; y++) {
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for (x = 0; x < im->width; x++) {
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r = (p16[x] & RrRedMask(inst)) >>
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g = (p16[x] & RrGreenMask(inst)) >>
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RrGreenOffset(inst) <<
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b = (p16[x] & RrBlueMask(inst)) >>
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RrBlueOffset(inst) <<
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data[x] = (r << RrDefaultRedOffset)
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+ (g << RrDefaultGreenOffset)
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+ (b << RrDefaultBlueOffset)
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+ (0xff << RrDefaultAlphaOffset);
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p16 += im->bytes_per_line/2;
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g_error("This image bit depth (%i) is currently unhandled", 8);
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for (y = 0; y < im->height; y++) {
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for (x = 0; x < im->width; x++) {
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if (!(((p8[x / 8]) >> (x % 8)) & 0x1))
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data[x] = 0xff << RrDefaultAlphaOffset; /* black */
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data[x] = 0xffffffff; /* white */
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p8 += im->bytes_per_line;
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g_error("This image bit depth (%i) is currently unhandled",
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gint RrColorRed(const RrColor *c)
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gint RrColorGreen(const RrColor *c)
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gint RrColorBlue(const RrColor *c)
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gulong RrColorPixel(const RrColor *c)
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GC RrColorGC(RrColor *c)
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RrColorAllocateGC(c);