Dogcows Code - chaz/openbox/blob - otk/gccache.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 extern "C" {
   8 #include <stdio.h>
   9 }
  10
  11 #include <algorithm>
  12
  13 #include "gccache.hh"
  14 #include "color.hh"
  15 #include "assassin.hh"
  16 #include "screeninfo.hh"
  17
  18 namespace otk {
  19
  20 GCCacheContext::~GCCacheContext(void) {
  21   if (gc)
  22     XFreeGC(**display, gc);
  23 }
  24
  25
  26 void GCCacheContext::set(const Color &_color,
  27                          const XFontStruct * const _font,
  28                          const int _function, const int _subwindow,
  29                          int _linewidth) {
  30   XGCValues gcv;
  31   pixel = gcv.foreground = _color.pixel();
  32   function = gcv.function = _function;
  33   subwindow = gcv.subwindow_mode = _subwindow;
  34   linewidth = gcv.line_width = _linewidth;
  35   gcv.cap_style = CapProjecting;
  36
  37   unsigned long mask = GCForeground | GCFunction | GCSubwindowMode |
  38     GCLineWidth | GCCapStyle;
  39
  40   if (_font) {
  41     fontid = gcv.font = _font->fid;
  42     mask |= GCFont;
  43   } else {
  44     fontid = 0;
  45   }
  46
  47   XChangeGC(**display, gc, mask, &gcv);
  48 }
  49
  50
  51 void GCCacheContext::set(const XFontStruct * const _font) {
  52   if (! _font) {
  53     fontid = 0;
  54     return;
  55   }
  56
  57   XGCValues gcv;
  58   fontid = gcv.font = _font->fid;
  59   XChangeGC(**display, gc, GCFont, &gcv);
  60 }
  61
  62
  63 GCCache::GCCache(unsigned int screen_count)
  64   : context_count(128u), cache_size(16u), cache_buckets(8u * screen_count),
  65     cache_total_size(cache_size * cache_buckets) {
  66
  67   contexts = new GCCacheContext*[context_count];
  68   unsigned int i;
  69   for (i = 0; i < context_count; i++) {
  70     contexts[i] = new GCCacheContext();
  71   }
  72
  73   cache = new GCCacheItem*[cache_total_size];
  74   for (i = 0; i < cache_total_size; ++i) {
  75     cache[i] = new GCCacheItem;
  76   }
  77 }
  78
  79
  80 GCCache::~GCCache(void) {
  81   std::for_each(contexts, contexts + context_count, PointerAssassin());
  82   std::for_each(cache, cache + cache_total_size, PointerAssassin());
  83   delete [] cache;
  84   delete [] contexts;
  85 }
  86
  87
  88 GCCacheContext *GCCache::nextContext(unsigned int scr) {
  89   Window hd = display->screenInfo(scr)->rootWindow();
  90
  91   GCCacheContext *c;
  92
  93   for (unsigned int i = 0; i < context_count; ++i) {
  94     c = contexts[i];
  95
  96     if (! c->gc) {
  97       c->gc = XCreateGC(**display, hd, 0, 0);
  98       c->used = false;
  99       c->screen = scr;
 100     }
 101     if (! c->used && c->screen == scr)
 102       return c;
 103   }
 104
 105   fprintf(stderr, "GCCache: context fault!\n");
 106   abort();
 107   return (GCCacheContext*) 0; // not reached
 108 }
 109
 110
 111 void GCCache::release(GCCacheContext *ctx) {
 112   ctx->used = false;
 113 }
 114
 115
 116 GCCacheItem *GCCache::find(const Color &_color,
 117                            const XFontStruct * const _font,
 118                            int _function, int _subwindow, int _linewidth) {
 119   const unsigned long pixel = _color.pixel();
 120   const unsigned int screen = _color.screen();
 121   const int key = _color.red() ^ _color.green() ^ _color.blue();
 122   int k = (key % cache_size) * cache_buckets;
 123   unsigned int i = 0; // loop variable
 124   GCCacheItem *c = cache[ k ], *prev = 0;
 125
 126   /*
 127     this will either loop cache_buckets times then return/abort or
 128     it will stop matching
 129   */
 130   while (c->ctx &&
 131          (c->ctx->pixel != pixel || c->ctx->function != _function ||
 132           c->ctx->subwindow != _subwindow || c->ctx->screen != screen ||
 133           c->ctx->linewidth != _linewidth)) {
 134     if (i < (cache_buckets - 1)) {
 135       prev = c;
 136       c = cache[ ++k ];
 137       ++i;
 138       continue;
 139     }
 140     if (c->count == 0 && c->ctx->screen == screen) {
 141       // use this cache item
 142       c->ctx->set(_color, _font, _function, _subwindow, _linewidth);
 143       c->ctx->used = true;
 144       c->count = 1;
 145       c->hits = 1;
 146       return c;
 147     }
 148     // cache fault!
 149     fprintf(stderr, "GCCache: cache fault, count: %d, screen: %d, item screen: %d\n", c->count, screen, c->ctx->screen);
 150     abort();
 151   }
 152
 153   if (c->ctx) {
 154     // reuse existing context
 155     if (_font && _font->fid && _font->fid != c->ctx->fontid)
 156       c->ctx->set(_font);
 157     c->count++;
 158     c->hits++;
 159     if (prev && c->hits > prev->hits) {
 160       cache[ k     ] = prev;
 161       cache[ k - 1 ] = c;
 162     }
 163   } else {
 164     c->ctx = nextContext(screen);
 165     c->ctx->set(_color, _font, _function, _subwindow, _linewidth);
 166     c->ctx->used = true;
 167     c->count = 1;
 168     c->hits = 1;
 169   }
 170
 171   return c;
 172 }
 173
 174
 175 void GCCache::release(GCCacheItem *_item) {
 176   _item->count--;
 177 }
 178
 179
 180 void GCCache::purge(void) {
 181   for (unsigned int i = 0; i < cache_total_size; ++i) {
 182     GCCacheItem *d = cache[ i ];
 183
 184     if (d->ctx && d->count == 0) {
 185       release(d->ctx);
 186       d->ctx = 0;
 187     }
 188   }
 189 }
 190
 191 }