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