otk_c/gccache.c (raw)
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// -*- mode: C; indent-tabs-mode: nil; c-basic-offset: 2; -*- #include "../config.h" #include "gccache.h" #include "screeninfo.h" #ifdef HAVE_STDLIB_H # include <stdlib.h> #endif static OtkGCCache *gccache = NULL; OtkGCCacheContext *OtkGCCacheContext_New() { OtkGCCacheContext *self = malloc(sizeof(OtkGCCacheContext)); self->gc = 0; self->pixel = 0ul; self->fontid = 0ul; self->function = 0; self->subwindow = 0; self->used = False; self->screen = ~0; self->linewidth = 0; return self; } void OtkGCCacheContext_Destroy(OtkGCCacheContext *self) { if (self->gc) XFreeGC(OBDisplay->display, self->gc); free(self); } void OtkGCCacheContext_Set(OtkGCCacheContext *self, OtkColor *color, XFontStruct *font, int function, int subwindow, int linewidth) { XGCValues gcv; unsigned long mask; self->pixel = gcv.foreground = color->pixel; self->function = gcv.function = function; self->subwindow = gcv.subwindow_mode = subwindow; self->linewidth = gcv.line_width = linewidth; gcv.cap_style = CapProjecting; mask = GCForeground | GCFunction | GCSubwindowMode | GCLineWidth | GCCapStyle; if (font) { self->fontid = gcv.font = font->fid; mask |= GCFont; } else { self->fontid = 0; } XChangeGC(OBDisplay->display, self->gc, mask, &gcv); } void OtkGCCacheContext_SetFont(OtkGCCacheContext *self, XFontStruct *font) { if (!font) { self->fontid = 0; return; } XGCValues gcv; self->fontid = gcv.font = font->fid; XChangeGC(OBDisplay->display, self->gc, GCFont, &gcv); } OtkGCCacheItem *OtkGCCacheItem_New() { OtkGCCacheItem *self = malloc(sizeof(OtkGCCacheItem)); self->ctx = 0; self->count = 0; self->hits = 0; self->fault = False; return self; } void OtkGCCache_Initialize() { unsigned int i; gccache = malloc(sizeof(OtkGCCache)); gccache->context_count = 128; gccache->cache_size = 16; gccache->cache_buckets = 8 * ScreenCount(OBDisplay->display); gccache->cache_total_size = gccache->cache_size * gccache->cache_buckets; gccache->contexts = malloc(sizeof(OtkGCCacheContext*) * gccache->context_count); for (i = 0; i < gccache->context_count; ++i) gccache->contexts[i] = OtkGCCacheContext_New(); gccache->cache = malloc(sizeof(OtkGCCacheItem*) * gccache->cache_total_size); for (i = 0; i < gccache->cache_total_size; ++i) gccache->cache[i] = OtkGCCacheItem_New(); } /*void OtkGCCache_Destroy() { unsigned int i; for (i = 0; i < gccache->context_count; ++i) OtkGCCacheContext_Destroy(gccache->contexts[i]); for (i = 0; i < gccache->cache_total_size; ++i) free(gccache->cache[i]); free(gccache->contexts); free(gccache->cache); free(gccache); gccache = NULL; }*/ static OtkGCCacheContext *nextContext(int screen) { Window hd = OtkDisplay_ScreenInfo(OBDisplay, screen)->root_window; OtkGCCacheContext *c; unsigned int i; for (i = 0; i < gccache->context_count; ++i) { c = gccache->contexts[i]; if (! c->gc) { c->gc = XCreateGC(OBDisplay->display, hd, 0, 0); c->used = False; c->screen = screen; } if (! c->used && c->screen == screen) return c; } fprintf(stderr, "OtkGCCache: context fault!\n"); abort(); return NULL; // shut gcc up } static void OtkGCCache_InternalRelease(OtkGCCacheContext *ctx) { ctx->used = False; } OtkGCCacheItem *OtkGCCache_Find(OtkColor *color, XFontStruct *font, int function, int subwindow, int linewidth) { const unsigned long pixel = color->pixel; const int screen = color->screen; const int key = color->red ^ color->green ^ color->blue; int k = (key % gccache->cache_size) * gccache->cache_buckets; unsigned int i = 0; // loop variable OtkGCCacheItem *c = gccache->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 < (gccache->cache_buckets - 1)) { prev = c; c = gccache->cache[++k]; ++i; continue; } if (c->count == 0 && c->ctx->screen == screen) { // use this cache item OtkGCCacheContext_Set(c->ctx, color, font, function, subwindow, linewidth); c->ctx->used = True; c->count = 1; c->hits = 1; return c; } // cache fault! fprintf(stderr, "OtkGCCache: 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) OtkGCCacheContext_SetFont(c->ctx, font); c->count++; c->hits++; if (prev && c->hits > prev->hits) { gccache->cache[k] = prev; gccache->cache[k-1] = c; } } else { c->ctx = nextContext(screen); OtkGCCacheContext_Set(c->ctx, color, font, function, subwindow, linewidth); c->ctx->used = True; c->count = 1; c->hits = 1; } return c; } void OtkGCCache_Release(OtkGCCacheItem *item) { item->count--; } void OtkGCCache_Purge() { unsigned int i; for (i = 0; i < gccache->cache_total_size; ++i) { OtkGCCacheItem *d = gccache->cache[i]; if (d->ctx && d->count == 0) { OtkGCCache_InternalRelease(d->ctx); d->ctx = 0; } } } |