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     _created(false)
  33 {
  34 }
  35
  36 RenderColor::RenderColor(int screen, RGB rgb)
  37   : _screen(screen),
  38     _red(rgb.r),
  39     _green(rgb.g),
  40     _blue(rgb.b),
  41     _allocated(false),
  42     _created(false)
  43 {
  44 }
  45
  46 void RenderColor::create() const
  47 {
  48   unsigned long color = _blue | _green << 8 | _red << 16;
  49
  50   // try get a gc from the cache
  51   CacheItem *item = _cache[_screen][color];
  52
  53   if (item) {
  54     _gc = item->gc;
  55     _pixel = item->pixel;
  56     ++item->count;
  57   } else {
  58     XGCValues gcv;
  59
  60     // allocate a color and GC from the server
  61     const ScreenInfo *info = display->screenInfo(_screen);
  62
  63     XColor xcol;    // convert from 0-0xff to 0-0xffff
  64     xcol.red = (_red << 8) | _red;
  65     xcol.green = (_green << 8) | _green;
  66     xcol.blue = (_blue << 8) | _blue;
  67     xcol.pixel = 0;
  68
  69     if (!XAllocColor(**display, info->colormap(), &xcol)) {
  70       fprintf(stderr, "RenderColor: color alloc error: rgb:%x/%x/%x\n",
  71               _red, _green, _blue);
  72       xcol.pixel = 0;
  73     } else
  74       _allocated = true;
  75
  76     _pixel = xcol.pixel;
  77     gcv.foreground = _pixel;
  78     gcv.cap_style = CapProjecting;
  79     _gc = XCreateGC(**display, info->rootWindow(),
  80                     GCForeground | GCCapStyle, &gcv);
  81     assert(_gc);
  82
  83     // insert into the cache
  84     item = new CacheItem(_gc, _pixel);
  85     _cache[_screen][color] = item;
  86     ++item->count;
  87   }
  88
  89   _created = true;
  90 }
  91
  92 unsigned long RenderColor::pixel() const
  93 {
  94   if (!_created) create();
  95   return _pixel;
  96 }
  97
  98 GC RenderColor::gc() const
  99 {
 100   if (!_created) create();
 101   return _gc;
 102 }
 103
 104 RenderColor::~RenderColor()
 105 {
 106   unsigned long color = _blue | _green << 8 | _red << 16;
 107
 108   if (_created) {
 109     CacheItem *item = _cache[_screen][color];
 110     assert(item); // better be...
 111
 112     if (--item->count <= 0) {
 113       // remove from the cache
 114       XFreeGC(**display, _gc);
 115       _cache[_screen][color] = 0;
 116       delete item;
 117
 118       if (_allocated) {
 119         const ScreenInfo *info = display->screenInfo(_screen);
 120         XFreeColors(**display, info->colormap(), &_pixel, 1, 0);
 121       }
 122     }
 123   }
 124 }
 125
 126 }