otk/gccache.cc (raw)
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// -*- mode: C++; indent-tabs-mode: nil; c-basic-offset: 2; -*- #ifdef HAVE_CONFIG_H # include "../config.h" #endif // HAVE_CONFIG_H extern "C" { #include <stdio.h> } #include <algorithm> #include "gccache.hh" #include "color.hh" #include "assassin.hh" #include "screeninfo.hh" namespace otk { GCCacheContext::~GCCacheContext(void) { if (gc) XFreeGC(**display, gc); } void GCCacheContext::set(const Color &_color, const XFontStruct * const _font, const int _function, const int _subwindow, int _linewidth) { XGCValues gcv; pixel = gcv.foreground = _color.pixel(); function = gcv.function = _function; subwindow = gcv.subwindow_mode = _subwindow; linewidth = gcv.line_width = _linewidth; gcv.cap_style = CapProjecting; unsigned long mask = GCForeground | GCFunction | GCSubwindowMode | GCLineWidth | GCCapStyle; if (_font) { fontid = gcv.font = _font->fid; mask |= GCFont; } else { fontid = 0; } XChangeGC(**display, gc, mask, &gcv); } void GCCacheContext::set(const XFontStruct * const _font) { if (! _font) { fontid = 0; return; } XGCValues gcv; fontid = gcv.font = _font->fid; XChangeGC(**display, gc, GCFont, &gcv); } GCCache::GCCache(unsigned int screen_count) : context_count(128u), cache_size(16u), cache_buckets(8u * screen_count), cache_total_size(cache_size * cache_buckets) { contexts = new GCCacheContext*[context_count]; unsigned int i; for (i = 0; i < context_count; i++) { contexts[i] = new GCCacheContext(); } cache = new GCCacheItem*[cache_total_size]; for (i = 0; i < cache_total_size; ++i) { cache[i] = new GCCacheItem; } } GCCache::~GCCache(void) { std::for_each(contexts, contexts + context_count, PointerAssassin()); std::for_each(cache, cache + cache_total_size, PointerAssassin()); delete [] cache; delete [] contexts; } GCCacheContext *GCCache::nextContext(unsigned int scr) { Window hd = display->screenInfo(scr)->rootWindow(); GCCacheContext *c; for (unsigned int i = 0; i < context_count; ++i) { c = contexts[i]; if (! c->gc) { c->gc = XCreateGC(**display, hd, 0, 0); c->used = false; c->screen = scr; } if (! c->used && c->screen == scr) return c; } fprintf(stderr, "GCCache: context fault!\n"); abort(); return (GCCacheContext*) 0; // not reached } void GCCache::release(GCCacheContext *ctx) { ctx->used = false; } GCCacheItem *GCCache::find(const Color &_color, const XFontStruct * const _font, int _function, int _subwindow, int _linewidth) { const unsigned long pixel = _color.pixel(); const unsigned int screen = _color.screen(); const int key = _color.red() ^ _color.green() ^ _color.blue(); int k = (key % cache_size) * cache_buckets; unsigned int i = 0; // loop variable GCCacheItem *c = cache[ k ], *prev = 0; /* this will either loop cache_buckets times then return/abort or it will stop matching */ while (c->ctx && (c->ctx->pixel != pixel || c->ctx->function != _function || c->ctx->subwindow != _subwindow || c->ctx->screen != screen || c->ctx->linewidth != _linewidth)) { if (i < (cache_buckets - 1)) { prev = c; c = cache[ ++k ]; ++i; continue; } if (c->count == 0 && c->ctx->screen == screen) { // use this cache item c->ctx->set(_color, _font, _function, _subwindow, _linewidth); c->ctx->used = true; c->count = 1; c->hits = 1; return c; } // cache fault! fprintf(stderr, "GCCache: cache fault, count: %d, screen: %d, item screen: %d\n", c->count, screen, c->ctx->screen); abort(); } if (c->ctx) { // reuse existing context if (_font && _font->fid && _font->fid != c->ctx->fontid) c->ctx->set(_font); c->count++; c->hits++; if (prev && c->hits > prev->hits) { cache[ k ] = prev; cache[ k - 1 ] = c; } } else { c->ctx = nextContext(screen); c->ctx->set(_color, _font, _function, _subwindow, _linewidth); c->ctx->used = true; c->count = 1; c->hits = 1; } return c; } void GCCache::release(GCCacheItem *_item) { _item->count--; } void GCCache::purge(void) { for (unsigned int i = 0; i < cache_total_size; ++i) { GCCacheItem *d = cache[ i ]; if (d->ctx && d->count == 0) { release(d->ctx); d->ctx = 0; } } } } |