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, const int _linewidth);
  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)), linewidth(0) {}
  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   int linewidth;
  58
  59   BGCCacheContext(const BGCCacheContext &_nocopy);
  60   BGCCacheContext &operator=(const BGCCacheContext &_nocopy);
  61
  62   friend class BGCCache;
  63   friend class BGCCacheItem;
  64 };
  65
  66 class BGCCacheItem {
  67 public:
  68   inline const GC &gc(void) const { return ctx->gc; }
  69
  70 private:
  71   BGCCacheItem(void) : ctx(0), count(0), hits(0), fault(false) { }
  72
  73   BGCCacheContext *ctx;
  74   unsigned int count;
  75   unsigned int hits;
  76   bool fault;
  77
  78   BGCCacheItem(const BGCCacheItem &_nocopy);
  79   BGCCacheItem &operator=(const BGCCacheItem &_nocopy);
  80
  81   friend class BGCCache;
  82 };
  83
  84 class BGCCache {
  85 public:
  86   BGCCache(const BaseDisplay * const _display, unsigned int screen_count);
  87   ~BGCCache(void);
  88
  89   // cleans up the cache
  90   void purge(void);
  91
  92   BGCCacheItem *find(const BColor &_color, const XFontStruct * const _font = 0,
  93                      int _function = GXcopy, int _subwindow = ClipByChildren,
  94                      int _linewidth = 0);
  95   void release(BGCCacheItem *_item);
  96
  97 private:
  98   BGCCacheContext *nextContext(unsigned int _screen);
  99   void release(BGCCacheContext *ctx);
 100
 101   // this is closely modelled after the Qt GC cache, but with some of the
 102   // complexity stripped out
 103   const BaseDisplay *display;
 104
 105   const unsigned int context_count;
 106   const unsigned int cache_size;
 107   const unsigned int cache_buckets;
 108   const unsigned int cache_total_size;
 109   BGCCacheContext **contexts;
 110   BGCCacheItem **cache;
 111 };
 112
 113 class BPen {
 114 public:
 115   inline BPen(const BColor &_color,  const XFontStruct * const _font = 0,
 116               int _linewidth = 0, int _function = GXcopy,
 117               int _subwindow = ClipByChildren)
 118     : color(_color), font(_font), linewidth(_linewidth), function(_function),
 119       subwindow(_subwindow), cache(_color.display()->gcCache()), item(0) { }
 120
 121   inline ~BPen(void) { if (item) cache->release(item); }
 122
 123   inline const GC &gc(void) const {
 124     if (! item) item = cache->find(color, font, function, subwindow,
 125                                    linewidth);
 126     return item->gc();
 127   }
 128
 129 private:
 130   const BColor &color;
 131   const XFontStruct *font;
 132   int linewidth;
 133   int function;
 134   int subwindow;
 135
 136   mutable BGCCache *cache;
 137   mutable BGCCacheItem *item;
 138 };
 139
 140
 141 #endif // GCCACHE_HH