Dogcows Code - chaz/openbox/blob - otk/rendercolor.cc

   1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   2
   3 #ifdef    HAVE_CONFIG_H
   4 #  include "../config.h"
   5 #endif // HAVE_CONFIG_H
   6
   7 #include "rendercolor.hh"
   8 #include "display.hh"
   9 #include "screeninfo.hh"
  10
  11 namespace otk {
  12
  13 std::map<unsigned long, RenderColor::CacheItem*> *RenderColor::_cache = 0;
  14
  15 void RenderColor::initialize()
  16 {
  17   _cache = new std::map<unsigned long, CacheItem*>[ScreenCount(**display)];
  18 }
  19
  20 void RenderColor::destroy()
  21 {
  22   delete [] _cache;
  23 }
  24
  25 RenderColor::RenderColor(int screen, unsigned char red,
  26                          unsigned char green, unsigned char blue)
  27   : _screen(screen),
  28     _red(red),
  29     _green(green),
  30     _blue(blue),
  31     _gc(0)
  32 {
  33   unsigned long color = _blue | _green << 8 | _red << 16;
  34
  35   // try get a gc from the cache
  36   CacheItem *item = _cache[_screen][color];
  37
  38   if (item) {
  39     _gc = item->gc;
  40     ++item->count;
  41   } else {
  42     XGCValues gcv;
  43
  44     // allocate a color and GC from the server
  45     const ScreenInfo *info = display->screenInfo(_screen);
  46
  47     XColor xcol;    // convert from 0-0xff to 0-0xffff
  48     xcol.red = _red; xcol.red |= xcol.red << 8;
  49     xcol.green = _green; xcol.green |= xcol.green << 8;
  50     xcol.blue = _blue; xcol.blue |= xcol.blue << 8;
  51     xcol.pixel = 0;
  52
  53     if (! XAllocColor(**display, info->colormap(), &xcol)) {
  54       fprintf(stderr, "RenderColor: color alloc error: rgb:%x/%x/%x\n",
  55               _red, _green, _blue);
  56       xcol.pixel = 0;
  57     }
  58
  59     gcv.foreground = xcol.pixel;
  60     _gc = XCreateGC(**display, info->rootWindow(), GCForeground, &gcv);
  61     assert(_gc);
  62
  63     // insert into the cache
  64     _cache[_screen][color] = new CacheItem(_gc);
  65   }
  66 }
  67
  68 RenderColor::~RenderColor()
  69 {
  70   unsigned long color = _blue | _green << 8 | _red << 16;
  71
  72   CacheItem *item = _cache[_screen][color];
  73   assert(item); // it better be in the cache ...
  74
  75   if (--item->count <= 0) {
  76     // remove from the cache
  77     XFreeGC(**display, _gc);
  78     _cache[_screen][color] = 0;
  79     delete item;
  80   }
  81 }
  82
  83 }