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 #include "rendercontrol.hh"
   9
  10 #include <cstdio>
  11
  12 namespace otk {
  13
  14 std::map<unsigned long, RenderColor::CacheItem*> *RenderColor::_cache = 0;
  15
  16 void RenderColor::initialize()
  17 {
  18   _cache = new std::map<unsigned long, CacheItem*>[ScreenCount(**display)];
  19 }
  20
  21 void RenderColor::destroy()
  22 {
  23   delete [] _cache;
  24 }
  25
  26 RenderColor::RenderColor(int screen, unsigned char red,
  27                          unsigned char green, unsigned char blue)
  28   : _screen(screen),
  29     _red(red),
  30     _green(green),
  31     _blue(blue)
  32 {
  33   create();
  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 {
  42   create();
  43 }
  44
  45 void RenderColor::create()
  46 {
  47   unsigned long color = _blue | _green << 8 | _red << 16;
  48
  49   // try get a gc from the cache
  50   CacheItem *item = _cache[_screen][color];
  51
  52   if (item) {
  53     _gc = item->gc;
  54     _pixel = item->pixel;
  55     ++item->count;
  56   } else {
  57     XGCValues gcv;
  58
  59     // allocate a color and GC from the server
  60     const ScreenInfo *info = display->screenInfo(_screen);
  61
  62     XColor xcol;    // convert from 0-0xff to 0-0xffff
  63     xcol.red = (_red << 8) | _red;
  64     xcol.green = (_green << 8) | _green;
  65     xcol.blue = (_blue << 8) | _blue;
  66
  67     display->renderControl(_screen)->allocateColor(&xcol);
  68
  69     _pixel = xcol.pixel;
  70     gcv.foreground = _pixel;
  71     gcv.cap_style = CapProjecting;
  72     _gc = XCreateGC(**display, info->rootWindow(),
  73                     GCForeground | GCCapStyle, &gcv);
  74     assert(_gc);
  75
  76     // insert into the cache
  77     item = new CacheItem(_gc, _pixel);
  78     _cache[_screen][color] = item;
  79     ++item->count;
  80   }
  81 }
  82
  83 RenderColor::~RenderColor()
  84 {
  85   unsigned long color = _blue | _green << 8 | _red << 16;
  86
  87   CacheItem *item = _cache[_screen][color];
  88   assert(item); // better be...
  89
  90   if (--item->count <= 0) {
  91     // remove from the cache
  92     XFreeGC(**display, _gc);
  93     _cache[_screen][color] = 0;
  94     delete item;
  95
  96     const ScreenInfo *info = display->screenInfo(_screen);
  97     XFreeColors(**display, info->colormap(), &_pixel, 1, 0);
  98   }
  99 }
 100
 101 }