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