Dogcows Code - chaz/openbox/blob - otk/gccache.hh

   1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   2 #ifndef GCCACHE_HH
   3 #define GCCACHE_HH
   4
   5 extern "C" {
   6 #include <X11/Xlib.h>
   7 }
   8
   9 #include "display.hh"
  10 #include "color.hh"
  11
  12 namespace otk {
  13
  14 class BGCCacheItem;
  15
  16 class BGCCacheContext {
  17 public:
  18   void set(const BColor &_color, const XFontStruct * const _font,
  19            const int _function, const int _subwindow, const int _linewidth);
  20   void set(const XFontStruct * const _font);
  21
  22   ~BGCCacheContext(void);
  23
  24 private:
  25   BGCCacheContext()
  26     : gc(0), pixel(0ul), fontid(0ul),
  27       function(0), subwindow(0), used(false), screen(~(0u)), linewidth(0) {}
  28
  29   GC gc;
  30   unsigned long pixel;
  31   unsigned long fontid;
  32   int function;
  33   int subwindow;
  34   bool used;
  35   unsigned int screen;
  36   int linewidth;
  37
  38   BGCCacheContext(const BGCCacheContext &_nocopy);
  39   BGCCacheContext &operator=(const BGCCacheContext &_nocopy);
  40
  41   friend class BGCCache;
  42   friend class BGCCacheItem;
  43 };
  44
  45 class BGCCacheItem {
  46 public:
  47   inline const GC &gc(void) const { return ctx->gc; }
  48
  49 private:
  50   BGCCacheItem(void) : ctx(0), count(0), hits(0), fault(false) { }
  51
  52   BGCCacheContext *ctx;
  53   unsigned int count;
  54   unsigned int hits;
  55   bool fault;
  56
  57   BGCCacheItem(const BGCCacheItem &_nocopy);
  58   BGCCacheItem &operator=(const BGCCacheItem &_nocopy);
  59
  60   friend class BGCCache;
  61 };
  62
  63 class BGCCache {
  64 public:
  65   BGCCache(unsigned int screen_count);
  66   ~BGCCache(void);
  67
  68   // cleans up the cache
  69   void purge(void);
  70
  71   BGCCacheItem *find(const BColor &_color, const XFontStruct * const _font = 0,
  72                      int _function = GXcopy, int _subwindow = ClipByChildren,
  73                      int _linewidth = 0);
  74   void release(BGCCacheItem *_item);
  75
  76 private:
  77   BGCCacheContext *nextContext(unsigned int _screen);
  78   void release(BGCCacheContext *ctx);
  79
  80   // this is closely modelled after the Qt GC cache, but with some of the
  81   // complexity stripped out
  82   const unsigned int context_count;
  83   const unsigned int cache_size;
  84   const unsigned int cache_buckets;
  85   const unsigned int cache_total_size;
  86   BGCCacheContext **contexts;
  87   BGCCacheItem **cache;
  88 };
  89
  90 class BPen {
  91 public:
  92   inline BPen(const BColor &_color,  const XFontStruct * const _font = 0,
  93               int _linewidth = 0, int _function = GXcopy,
  94               int _subwindow = ClipByChildren)
  95     : color(_color), font(_font), linewidth(_linewidth), function(_function),
  96       subwindow(_subwindow), cache(OBDisplay::gcCache()), item(0) { }
  97
  98   inline ~BPen(void) { if (item) cache->release(item); }
  99
 100   inline const GC &gc(void) const {
 101     if (! item) item = cache->find(color, font, function, subwindow,
 102                                    linewidth);
 103     return item->gc();
 104   }
 105
 106 private:
 107   const BColor &color;
 108   const XFontStruct *font;
 109   int linewidth;
 110   int function;
 111   int subwindow;
 112
 113   mutable BGCCache *cache;
 114   mutable BGCCacheItem *item;
 115 };
 116
 117 }
 118
 119 #endif // GCCACHE_HH