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

   1 // -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   2 // GCCache.cc 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 #ifdef HAVE_CONFIG_H
  25 #  include "../config.h"
  26 #endif // HAVE_CONFIG_H
  27
  28 extern "C" {
  29 #include <stdio.h>
  30 }
  31
  32 #include "GCCache.hh"
  33 #include "BaseDisplay.hh"
  34 #include "Color.hh"
  35 #include "Util.hh"
  36
  37
  38 BGCCacheContext::~BGCCacheContext(void) {
  39   if (gc)
  40     XFreeGC(display->getXDisplay(), gc);
  41 }
  42
  43
  44 void BGCCacheContext::set(const BColor &_color,
  45                           const XFontStruct * const _font,
  46                           const int _function, const int _subwindow) {
  47   XGCValues gcv;
  48   pixel = gcv.foreground = _color.pixel();
  49   function = gcv.function = _function;
  50   subwindow = gcv.subwindow_mode = _subwindow;
  51   unsigned long mask = GCForeground | GCFunction | GCSubwindowMode;
  52
  53   if (_font) {
  54     fontid = gcv.font = _font->fid;
  55     mask |= GCFont;
  56   } else {
  57     fontid = 0;
  58   }
  59
  60   XChangeGC(display->getXDisplay(), gc, mask, &gcv);
  61 }
  62
  63
  64 void BGCCacheContext::set(const XFontStruct * const _font) {
  65   if (! _font) {
  66     fontid = 0;
  67     return;
  68   }
  69
  70   XGCValues gcv;
  71   fontid = gcv.font = _font->fid;
  72   XChangeGC(display->getXDisplay(), gc, GCFont, &gcv);
  73 }
  74
  75
  76 BGCCache::BGCCache(const BaseDisplay * const _display)
  77   : display(_display),  context_count(128u),
  78     cache_size(16u), cache_buckets(8u),
  79     cache_total_size(cache_size * cache_buckets) {
  80
  81   contexts = new BGCCacheContext*[context_count];
  82   unsigned int i;
  83   for (i = 0; i < context_count; i++) {
  84     contexts[i] = new BGCCacheContext(display);
  85   }
  86
  87   cache = new BGCCacheItem*[cache_total_size];
  88   for (i = 0; i < cache_total_size; ++i) {
  89     cache[i] = new BGCCacheItem;
  90   }
  91 }
  92
  93
  94 BGCCache::~BGCCache(void) {
  95   std::for_each(contexts, contexts + context_count, PointerAssassin());
  96   std::for_each(cache, cache + cache_total_size, PointerAssassin());
  97   delete [] cache;
  98   delete [] contexts;
  99 }
 100
 101
 102 BGCCacheContext *BGCCache::nextContext(unsigned int scr) {
 103   Window hd = display->getScreenInfo(scr)->getRootWindow();
 104
 105   BGCCacheContext *c;
 106
 107   for (unsigned int i = 0; i < context_count; ++i) {
 108     c = contexts[i];
 109
 110     if (! c->gc) {
 111       c->gc = XCreateGC(display->getXDisplay(), hd, 0, 0);
 112       c->used = false;
 113       c->screen = scr;
 114     }
 115     if (! c->used && c->screen == scr) {
 116       c->used = true;
 117       return c;
 118     }
 119   }
 120
 121   fprintf(stderr, "BGCCache: context fault!\n");
 122   abort();
 123   return (BGCCacheContext*) 0; // not reached
 124 }
 125
 126
 127 void BGCCache::release(BGCCacheContext *ctx) {
 128   ctx->used = false;
 129 }
 130
 131
 132 BGCCacheItem *BGCCache::find(const BColor &_color,
 133                              const XFontStruct * const _font,
 134                              int _function, int _subwindow) {
 135   const unsigned long pixel = _color.pixel();
 136   const unsigned int screen = _color.screen();
 137   const int key = _color.red() ^ _color.green() ^ _color.blue();
 138   int k = (key % cache_size) * cache_buckets;
 139   int i = 0; // loop variable
 140   BGCCacheItem *c = cache[ k ], *prev = 0;
 141
 142   // this will either loop 8 times then return/abort or it will stop matching
 143   while (c->ctx &&
 144          (c->ctx->pixel != pixel || c->ctx->function != _function ||
 145           c->ctx->subwindow != _subwindow || c->ctx->screen != screen)) {
 146     if (i < 7) {
 147       prev = c;
 148       c = cache[ ++k ];
 149       ++i;
 150       continue;
 151     }
 152     if (c->count == 0 && c->ctx->screen == screen) {
 153       // use this cache item
 154       c->ctx->set(_color, _font, _function, _subwindow);
 155       c->ctx->used = true;
 156       c->count = 1;
 157       c->hits = 1;
 158       return c;
 159     }
 160     // cache fault!
 161     fprintf(stderr, "BGCCache: cache fault\n");
 162     abort();
 163   }
 164
 165   const unsigned long fontid = _font ? _font->fid : 0;
 166   if (c->ctx) {
 167     // reuse existing context
 168     if (fontid && fontid != c->ctx->fontid)
 169       c->ctx->set(_font);
 170     c->count++;
 171     c->hits++;
 172     if (prev && c->hits > prev->hits) {
 173       cache[ k     ] = prev;
 174       cache[ k - 1 ] = c;
 175     }
 176   } else {
 177     c->ctx = nextContext(screen);
 178     c->ctx->set(_color, _font, _function, _subwindow);
 179     c->ctx->used = true;
 180     c->count = 1;
 181     c->hits = 1;
 182   }
 183
 184   return c;
 185 }
 186
 187
 188 void BGCCache::release(BGCCacheItem *_item) {
 189   _item->count--;
 190 }
 191
 192
 193 void BGCCache::purge(void) {
 194   for (unsigned int i = 0; i < cache_total_size; ++i) {
 195     BGCCacheItem *d = cache[ i ];
 196
 197     if (d->ctx && d->count == 0) {
 198       release(d->ctx);
 199       d->ctx = 0;
 200     }
 201   }
 202 }