Dogcows Code - chaz/openbox/blob - src/GCCache.hh

   1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   2 // GCCache.hh for Blackbox - an X11 Window manager
   3 // Copyright (c) 2001 - 2002 Sean 'Shaleh' Perry <shaleh at debian.org>
   4 // Copyright (c) 1997 - 2000, 2002 Bradley T Hughes <bhughes at trolltech.com>
   5 //
   6 // Permission is hereby granted, free of charge, to any person obtaining a
   7 // copy of this software and associated documentation files (the "Software"),
   8 // to deal in the Software without restriction, including without limitation
   9 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10 // and/or sell copies of the Software, and to permit persons to whom the
  11 // Software is furnished to do so, subject to the following conditions:
  12 //
  13 // The above copyright notice and this permission notice shall be included in
  14 // all copies or substantial portions of the Software.
  15 //
  16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19 // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22 // DEALINGS IN THE SOFTWARE.
  23
  24 #ifndef GCCACHE_HH
  25 #define GCCACHE_HH
  26
  27 extern "C" {
  28 #include <X11/Xlib.h>
  29 }
  30
  31 #include "BaseDisplay.hh"
  32 #include "Color.hh"
  33
  34 class BGCCacheItem;
  35
  36 class BGCCacheContext {
  37 public:
  38   void set(const BColor &_color, const XFontStruct * const _font,
  39            const int _function, const int _subwindow);
  40   void set(const XFontStruct * const _font);
  41
  42   ~BGCCacheContext(void);
  43
  44 private:
  45   BGCCacheContext(const BaseDisplay * const _display)
  46     : display(_display), gc(0), pixel(0ul), fontid(0ul),
  47       function(0), subwindow(0), used(false), screen(~(0u)) {}
  48
  49   const BaseDisplay *display;
  50   GC gc;
  51   unsigned long pixel;
  52   unsigned long fontid;
  53   int function;
  54   int subwindow;
  55   bool used;
  56   unsigned int screen;
  57
  58   BGCCacheContext(const BGCCacheContext &_nocopy);
  59   BGCCacheContext &operator=(const BGCCacheContext &_nocopy);
  60
  61   friend class BGCCache;
  62   friend class BGCCacheItem;
  63 };
  64
  65 class BGCCacheItem {
  66 public:
  67   inline const GC &gc(void) const { return ctx->gc; }
  68
  69 private:
  70   BGCCacheItem(void) : ctx(0), count(0), hits(0), fault(false) { }
  71
  72   BGCCacheContext *ctx;
  73   unsigned int count;
  74   unsigned int hits;
  75   bool fault;
  76
  77   BGCCacheItem(const BGCCacheItem &_nocopy);
  78   BGCCacheItem &operator=(const BGCCacheItem &_nocopy);
  79
  80   friend class BGCCache;
  81 };
  82
  83 class BGCCache {
  84 public:
  85   explicit BGCCache(const BaseDisplay * const _display);
  86   ~BGCCache(void);
  87
  88   // cleans up the cache
  89   void purge(void);
  90
  91   BGCCacheItem *find(const BColor &_color, const XFontStruct * const _font = 0,
  92                      int _function = GXcopy, int _subwindow = ClipByChildren);
  93   void release(BGCCacheItem *_item);
  94
  95 private:
  96   BGCCacheContext *nextContext(unsigned int _screen);
  97   void release(BGCCacheContext *ctx);
  98
  99   // this is closely modelled after the Qt GC cache, but with some of the
 100   // complexity stripped out
 101   const BaseDisplay *display;
 102
 103   const unsigned int context_count;
 104   const unsigned int cache_size;
 105   const unsigned int cache_buckets;
 106   const unsigned int cache_total_size;
 107   BGCCacheContext **contexts;
 108   BGCCacheItem **cache;
 109 };
 110
 111 class BPen {
 112 public:
 113   inline BPen(const BColor &_color,  const XFontStruct * const _font = 0,
 114               int _function = GXcopy, int _subwindow = ClipByChildren)
 115     : color(_color), font(_font), function(_function), subwindow(_subwindow),
 116       cache(_color.display()->gcCache()), item(0) { }
 117   inline ~BPen(void) { if (item) cache->release(item); }
 118
 119   inline const GC &gc(void) const {
 120     if (! item) item = cache->find(color, font, function, subwindow);
 121     return item->gc();
 122   }
 123
 124 private:
 125   const BColor &color;
 126   const XFontStruct *font;
 127   int function;
 128   int subwindow;
 129
 130   mutable BGCCache *cache;
 131   mutable BGCCacheItem *item;
 132 };
 133
 134
 135 #endif // GCCACHE_HH