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-// -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*-
-// GCCache.hh for Blackbox - an X11 Window manager
-// Copyright (c) 2001 - 2002 Sean 'Shaleh' Perry <shaleh at debian.org>
-// Copyright (c) 1997 - 2000, 2002 Bradley T Hughes <bhughes at trolltech.com>
-//
-// Permission is hereby granted, free of charge, to any person obtaining a
-// copy of this software and associated documentation files (the "Software"),
-// to deal in the Software without restriction, including without limitation
-// the rights to use, copy, modify, merge, publish, distribute, sublicense,
-// and/or sell copies of the Software, and to permit persons to whom the
-// Software is furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in
-// all copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
-// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
-// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
-// DEALINGS IN THE SOFTWARE.
-
-#ifndef GCCACHE_HH
-#define GCCACHE_HH
-
-extern "C" {
-#include <X11/Xlib.h>
-}
-
-#include "BaseDisplay.hh"
-#include "Color.hh"
-
-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(const BaseDisplay * const _display)
- : display(_display), gc(0), pixel(0ul), fontid(0ul),
- function(0), subwindow(0), used(false), screen(~(0u)), linewidth(0) {}
-
- const BaseDisplay *display;
- 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(const BaseDisplay * const _display, 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 BaseDisplay *display;
-
- 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(_color.display()->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