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

   1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   2
   3 #include "config.h"
   4
   5 #include "rendercolor.hh"
   6 #include "display.hh"
   7 #include "screeninfo.hh"
   8
   9 #include <cstdio>
  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     _allocated(false)
  32 {
  33 }
  34
  35 RenderColor::RenderColor(int screen, RGB rgb)
  36   : _screen(screen),
  37     _red(rgb.r),
  38     _green(rgb.g),
  39     _blue(rgb.b),
  40     _allocated(false)
  41 {
  42 }
  43
  44 void RenderColor::create() const
  45 {
  46   unsigned long color = _blue | _green << 8 | _red << 16;
  47
  48   // try get a gc from the cache
  49   CacheItem *item = _cache[_screen][color];
  50
  51   if (item) {
  52     _gc = item->gc;
  53     _pixel = item->pixel;
  54     ++item->count;
  55   } else {
  56     XGCValues gcv;
  57
  58     // allocate a color and GC from the server
  59     const ScreenInfo *info = display->screenInfo(_screen);
  60
  61     XColor xcol;    // convert from 0-0xff to 0-0xffff
  62     xcol.red = (_red << 8) | _red;
  63     xcol.green = (_green << 8) | _green;
  64     xcol.blue = (_blue << 8) | _blue;
  65     xcol.pixel = 0;
  66
  67     if (! XAllocColor(**display, info->colormap(), &xcol)) {
  68       fprintf(stderr, "RenderColor: color alloc error: rgb:%x/%x/%x\n",
  69               _red, _green, _blue);
  70       xcol.pixel = 0;
  71     }
  72
  73     _pixel = xcol.pixel;
  74     gcv.foreground = _pixel;
  75     gcv.cap_style = CapProjecting;
  76     _gc = XCreateGC(**display, info->rootWindow(),
  77                     GCForeground | GCCapStyle, &gcv);
  78     assert(_gc);
  79
  80     // insert into the cache
  81     item = new CacheItem(_gc, _pixel);
  82     _cache[_screen][color] = item;
  83     ++item->count;
  84   }
  85
  86   _allocated = true;
  87 }
  88
  89 unsigned long RenderColor::pixel() const
  90 {
  91   if (!_allocated) create();
  92   return _pixel;
  93 }
  94
  95 GC RenderColor::gc() const
  96 {
  97   if (!_allocated) create();
  98   return _gc;
  99 }
 100
 101 RenderColor::~RenderColor()
 102 {
 103   unsigned long color = _blue | _green << 8 | _red << 16;
 104
 105   CacheItem *item = _cache[_screen][color];
 106
 107   if (item) {
 108     if (--item->count <= 0) {
 109       // remove from the cache
 110       XFreeGC(**display, _gc);
 111       _cache[_screen][color] = 0;
 112       delete item;
 113
 114       const ScreenInfo *info = display->screenInfo(_screen);
 115       XFreeColors(**display, info->colormap(), &_pixel, 1, 0);
 116     }
 117   }
 118 }
 119
 120 }