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 extern "C" {
  12 #ifdef HAVE_STDIO_H
  13 #  include <stdio.h>
  14 #endif
  15 }
  16
  17 namespace otk {
  18
  19 std::map<unsigned long, RenderColor::CacheItem*> *RenderColor::_cache = 0;
  20
  21 void RenderColor::initialize()
  22 {
  23   _cache = new std::map<unsigned long, CacheItem*>[ScreenCount(**display)];
  24 }
  25
  26 void RenderColor::destroy()
  27 {
  28   delete [] _cache;
  29 }
  30
  31 RenderColor::RenderColor(int screen, unsigned char red,
  32                          unsigned char green, unsigned char blue)
  33   : _screen(screen),
  34     _red(red),
  35     _green(green),
  36     _blue(blue),
  37     _gc(0)
  38 {
  39   create();
  40 }
  41
  42 RenderColor::RenderColor(int screen, RGB rgb)
  43   : _screen(screen),
  44     _red(rgb.r),
  45     _green(rgb.g),
  46     _blue(rgb.b),
  47     _gc(0)
  48 {
  49   create();
  50 }
  51
  52 void RenderColor::create()
  53 {
  54   unsigned long color = _blue | _green << 8 | _red << 16;
  55
  56   // try get a gc from the cache
  57   CacheItem *item = _cache[_screen][color];
  58
  59   if (item) {
  60     _gc = item->gc;
  61     _pixel = item->pixel;
  62     ++item->count;
  63   } else {
  64     XGCValues gcv;
  65
  66     // allocate a color and GC from the server
  67     const ScreenInfo *info = display->screenInfo(_screen);
  68
  69     XColor xcol;    // convert from 0-0xff to 0-0xffff
  70     xcol.red = _red; xcol.red |= xcol.red << 8;
  71     xcol.green = _green; xcol.green |= xcol.green << 8;
  72     xcol.blue = _blue; xcol.blue |= xcol.blue << 8;
  73     xcol.pixel = 0;
  74
  75     if (! XAllocColor(**display, info->colormap(), &xcol)) {
  76       fprintf(stderr, "RenderColor: color alloc error: rgb:%x/%x/%x\n",
  77               _red, _green, _blue);
  78       xcol.pixel = 0;
  79     }
  80
  81     _pixel = xcol.pixel;
  82     gcv.foreground = _pixel;
  83     gcv.cap_style = CapProjecting;
  84     _gc = XCreateGC(**display, info->rootWindow(),
  85                     GCForeground | GCCapStyle, &gcv);
  86     assert(_gc);
  87
  88     // insert into the cache
  89     item = new CacheItem(_gc, _pixel);
  90     _cache[_screen][color] = item;
  91     ++item->count;
  92   }
  93 }
  94
  95 RenderColor::~RenderColor()
  96 {
  97   unsigned long color = _blue | _green << 8 | _red << 16;
  98
  99   CacheItem *item = _cache[_screen][color];
 100   assert(item); // it better be in the cache ...
 101
 102   if (--item->count <= 0) {
 103     // remove from the cache
 104     XFreeGC(**display, _gc);
 105     _cache[_screen][color] = 0;
 106     delete item;
 107   }
 108 }
 109
 110 }