otk/color.cc (raw)
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// -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*- #ifdef HAVE_CONFIG_H # include "../config.h" #endif // HAVE_CONFIG_H extern "C" { #include <stdio.h> } #include <assert.h> #include "color.hh" #include "display.hh" #include "screeninfo.hh" namespace otk { Color::ColorCache Color::colorcache; bool Color::cleancache = false; Color::Color(unsigned int _screen) : allocated(false), r(-1), g(-1), b(-1), p(0), scrn(_screen) {} Color::Color(int _r, int _g, int _b, unsigned int _screen) : allocated(false), r(_r), g(_g), b(_b), p(0), scrn(_screen) {} Color::Color(const std::string &_name, unsigned int _screen) : allocated(false), r(-1), g(-1), b(-1), p(0), scrn(_screen), colorname(_name) { parseColorName(); } Color::~Color(void) { deallocate(); } void Color::setScreen(unsigned int _screen) { if (_screen == screen()) { // nothing to do return; } deallocate(); scrn = _screen; if (! colorname.empty()) { parseColorName(); } } unsigned long Color::pixel(void) const { if (! allocated) { // mutable Color *that = (Color *) this; that->allocate(); } return p; } void Color::parseColorName(void) { if (colorname.empty()) { fprintf(stderr, "Color: empty colorname, cannot parse (using black)\n"); setRGB(0, 0, 0); } if (scrn == ~(0u)) scrn = DefaultScreen(Display::display); Colormap colormap = Display::screenInfo(scrn)->colormap(); // get rgb values from colorname XColor xcol; xcol.red = 0; xcol.green = 0; xcol.blue = 0; xcol.pixel = 0; if (! XParseColor(Display::display, colormap, colorname.c_str(), &xcol)) { fprintf(stderr, "Color::allocate: color parse error: \"%s\"\n", colorname.c_str()); setRGB(0, 0, 0); return; } setRGB(xcol.red >> 8, xcol.green >> 8, xcol.blue >> 8); } void Color::allocate(void) { if (scrn == ~(0u)) scrn = DefaultScreen(Display::display); Colormap colormap = Display::screenInfo(scrn)->colormap(); if (! isValid()) { if (colorname.empty()) { fprintf(stderr, "Color: cannot allocate invalid color (using black)\n"); setRGB(0, 0, 0); } else { parseColorName(); } } // see if we have allocated this color before RGB rgb(scrn, r, g, b); ColorCache::iterator it = colorcache.find(rgb); if (it != colorcache.end()) { // found allocated = true; p = (*it).second.p; (*it).second.count++; return; } // allocate color from rgb values XColor xcol; xcol.red = r | r << 8; xcol.green = g | g << 8; xcol.blue = b | b << 8; xcol.pixel = 0; if (! XAllocColor(Display::display, colormap, &xcol)) { fprintf(stderr, "Color::allocate: color alloc error: rgb:%x/%x/%x\n", r, g, b); xcol.pixel = 0; } p = xcol.pixel; allocated = true; colorcache.insert(ColorCacheItem(rgb, PixelRef(p))); if (cleancache) doCacheCleanup(); } void Color::deallocate(void) { if (! allocated) return; ColorCache::iterator it = colorcache.find(RGB(scrn, r, g, b)); if (it != colorcache.end()) { if ((*it).second.count >= 1) (*it).second.count--; } if (cleancache) doCacheCleanup(); allocated = false; } Color &Color::operator=(const Color &c) { deallocate(); setRGB(c.r, c.g, c.b); colorname = c.colorname; scrn = c.scrn; return *this; } void Color::cleanupColorCache(void) { cleancache = true; } void Color::doCacheCleanup(void) { // ### TODO - support multiple displays! ColorCache::iterator it = colorcache.begin(); if (it == colorcache.end()) { // nothing to do return; } unsigned long *pixels = new unsigned long[ colorcache.size() ]; int i; unsigned count; for (i = 0; i < ScreenCount(Display::display); i++) { count = 0; it = colorcache.begin(); while (it != colorcache.end()) { if ((*it).second.count != 0 || (*it).first.screen != i) { ++it; continue; } pixels[ count++ ] = (*it).second.p; ColorCache::iterator it2 = it; ++it; colorcache.erase(it2); } if (count > 0) XFreeColors(Display::display, Display::screenInfo(i)->colormap(), pixels, count, 0); } delete [] pixels; cleancache = false; } } |