119 lines
2.8 KiB
C++
119 lines
2.8 KiB
C++
// -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
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#ifndef GCCACHE_HH
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#define GCCACHE_HH
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extern "C" {
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#include <X11/Xlib.h>
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}
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#include "display.hh"
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#include "color.hh"
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namespace otk {
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class BGCCacheItem;
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class BGCCacheContext {
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public:
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void set(const BColor &_color, const XFontStruct * const _font,
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const int _function, const int _subwindow, const int _linewidth);
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void set(const XFontStruct * const _font);
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~BGCCacheContext(void);
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private:
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BGCCacheContext()
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: gc(0), pixel(0ul), fontid(0ul),
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function(0), subwindow(0), used(false), screen(~(0u)), linewidth(0) {}
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GC gc;
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unsigned long pixel;
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unsigned long fontid;
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int function;
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int subwindow;
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bool used;
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unsigned int screen;
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int linewidth;
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BGCCacheContext(const BGCCacheContext &_nocopy);
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BGCCacheContext &operator=(const BGCCacheContext &_nocopy);
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friend class BGCCache;
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friend class BGCCacheItem;
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};
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class BGCCacheItem {
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public:
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inline const GC &gc(void) const { return ctx->gc; }
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private:
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BGCCacheItem(void) : ctx(0), count(0), hits(0), fault(false) { }
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BGCCacheContext *ctx;
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unsigned int count;
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unsigned int hits;
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bool fault;
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BGCCacheItem(const BGCCacheItem &_nocopy);
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BGCCacheItem &operator=(const BGCCacheItem &_nocopy);
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friend class BGCCache;
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};
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class BGCCache {
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public:
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BGCCache(unsigned int screen_count);
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~BGCCache(void);
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// cleans up the cache
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void purge(void);
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BGCCacheItem *find(const BColor &_color, const XFontStruct * const _font = 0,
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int _function = GXcopy, int _subwindow = ClipByChildren,
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int _linewidth = 0);
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void release(BGCCacheItem *_item);
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private:
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BGCCacheContext *nextContext(unsigned int _screen);
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void release(BGCCacheContext *ctx);
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// this is closely modelled after the Qt GC cache, but with some of the
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// complexity stripped out
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const unsigned int context_count;
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const unsigned int cache_size;
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const unsigned int cache_buckets;
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const unsigned int cache_total_size;
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BGCCacheContext **contexts;
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BGCCacheItem **cache;
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};
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class BPen {
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public:
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inline BPen(const BColor &_color, const XFontStruct * const _font = 0,
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int _linewidth = 0, int _function = GXcopy,
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int _subwindow = ClipByChildren)
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: color(_color), font(_font), linewidth(_linewidth), function(_function),
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subwindow(_subwindow), cache(OBDisplay::gcCache()), item(0) { }
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inline ~BPen(void) { if (item) cache->release(item); }
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inline const GC &gc(void) const {
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if (! item) item = cache->find(color, font, function, subwindow,
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linewidth);
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return item->gc();
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}
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private:
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const BColor &color;
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const XFontStruct *font;
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int linewidth;
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int function;
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int subwindow;
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mutable BGCCache *cache;
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mutable BGCCacheItem *item;
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};
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}
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#endif // GCCACHE_HH
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