Dogcows Code - chaz/openbox/blob - otk_c/gccache.c

   1 // -*- mode: C; indent-tabs-mode: nil; -*-
   2
   3 #include "../config.h"
   4 #include "gccache.h"
   5 #include "screeninfo.h"
   6
   7 #ifdef HAVE_STDLIB_H
   8 # include <stdlib.h>
   9 #endif
  10
  11 static OtkGCCache *gccache;
  12
  13 OtkGCCacheContext *OtkGCCacheContext_New()
  14 {
  15   OtkGCCacheContext *self = malloc(sizeof(OtkGCCacheContext));
  16
  17   self->gc = 0;
  18   self->pixel = 0ul;
  19   self->fontid = 0ul;
  20   self->function = 0;
  21   self->subwindow = 0;
  22   self->used = False;
  23   self->screen = ~0;
  24   self->linewidth = 0;
  25
  26   return self;
  27 }
  28
  29 void OtkGCCacheContext_Destroy(OtkGCCacheContext *self)
  30 {
  31   if (self->gc)
  32     XFreeGC(OBDisplay->display, self->gc);
  33   free(self);
  34 }
  35
  36 void OtkGCCacheContext_Set(OtkGCCacheContext *self,
  37                            OtkColor *color, XFontStruct *font,
  38                            int function, int subwindow, int linewidth)
  39 {
  40   XGCValues gcv;
  41   unsigned long mask;
  42
  43   self->pixel = gcv.foreground = OtkColor_Pixel(color);
  44   self->function = gcv.function = function;
  45   self->subwindow = gcv.subwindow_mode = subwindow;
  46   self->linewidth = gcv.line_width = linewidth;
  47   gcv.cap_style = CapProjecting;
  48
  49   mask = GCForeground | GCFunction | GCSubwindowMode | GCLineWidth |
  50          GCCapStyle;
  51
  52   if (font) {
  53     self->fontid = gcv.font = font->fid;
  54     mask |= GCFont;
  55   } else {
  56     self->fontid = 0;
  57   }
  58
  59   XChangeGC(OBDisplay->display, self->gc, mask, &gcv);
  60 }
  61
  62 void OtkGCCacheContext_SetFont(OtkGCCacheContext *self,
  63                                XFontStruct *font)
  64 {
  65   if (!font) {
  66     self->fontid = 0;
  67     return;
  68   }
  69
  70   XGCValues gcv;
  71   self->fontid = gcv.font = font->fid;
  72   XChangeGC(OBDisplay->display, self->gc, GCFont, &gcv);
  73 }
  74
  75
  76 OtkGCCacheItem *OtkGCCacheItem_New()
  77 {
  78   OtkGCCacheItem *self = malloc(sizeof(OtkGCCacheItem));
  79
  80   self->ctx = 0;
  81   self->count = 0;
  82   self->hits = 0;
  83   self->fault = False;
  84 }
  85
  86
  87 void OtkGCCache_Initialize(int screen_count)
  88 {
  89   int i;
  90
  91   gccache = malloc(sizeof(OtkGCCache));
  92
  93   gccache->context_count = 128;
  94   gccache->cache_size = 16;
  95   gccache->cache_buckets = 8 * screen_count;
  96   gccache->cache_total_size = gccache->cache_size * gccache->cache_buckets;
  97
  98   gccache->contexts = malloc(sizeof(OtkGCCacheContext*) *
  99                              gccache->context_count);
 100   for (i = 0; i < gccache->context_count; ++i)
 101     gccache->contexts[i] = OtkGCCacheContext_New();
 102
 103   gccache->cache = malloc(sizeof(OtkGCCacheItem*) * gccache->cache_total_size);
 104   for (i = 0; i < gccache->cache_total_size; ++i)
 105     gccache->cache[i] = OtkGCCacheItem_New();
 106 }
 107
 108
 109 void OtkGCCache_Destroy()
 110 {
 111   int i;
 112
 113   for (i = 0; i < gccache->context_count; ++i)
 114     OtkGCCacheContext_Destroy(gccache->contexts[i]);
 115
 116   for (i = 0; i < gccache->cache_total_size; ++i)
 117     free(gccache->cache[i]);
 118
 119   free(gccache->contexts);
 120   free(gccache->cache);
 121   free(gccache);
 122   gccache = NULL;
 123 }
 124
 125 OtkGCCacheContext *OtkGCCache_NextContext(int screen)
 126 {
 127   Window hd = OtkDisplay_ScreenInfo(OBDisplay, screen)->root_window;
 128   OtkGCCacheContext *c;
 129   int i;
 130
 131   for (i = 0; i < gccache->context_count; ++i) {
 132     c = gccache->contexts[i];
 133
 134     if (! c->gc) {
 135       c->gc = XCreateGC(OBDisplay->display, hd, 0, 0);
 136       c->used = False;
 137       c->screen = screen;
 138     }
 139     if (! c->used && c->screen == screen)
 140       return c;
 141   }
 142
 143   fprintf(stderr, "OtkGCCache: context fault!\n");
 144   abort();
 145   return NULL; // shut gcc up
 146 }
 147
 148
 149 static void OtkGCCache_InternalRelease(OtkGCCacheContext *ctx)
 150 {
 151   ctx->used = False;
 152 }
 153
 154 OtkGCCacheItem *OtkGCCache_Find(OtkColor *color, XFontStruct *font,
 155                                 int function, int subwindow, int linewidth)
 156 {
 157   const unsigned long pixel = OtkColor_Pixel(color);
 158   const unsigned int screen = color->screen;
 159   const int key = color->red ^ color->green ^ color->blue;
 160   int k = (key % gccache->cache_size) * gccache->cache_buckets;
 161   int i = 0; // loop variable
 162   OtkGCCacheItem *c = gccache->cache[k], *prev = 0;
 163
 164   /*
 165     this will either loop cache_buckets times then return/abort or
 166     it will stop matching
 167   */
 168   while (c->ctx &&
 169          (c->ctx->pixel != pixel || c->ctx->function != function ||
 170           c->ctx->subwindow != subwindow || c->ctx->screen != screen ||
 171           c->ctx->linewidth != linewidth)) {
 172     if (i < (gccache->cache_buckets - 1)) {
 173       prev = c;
 174       c = gccache->cache[++k];
 175       ++i;
 176       continue;
 177     }
 178     if (c->count == 0 && c->ctx->screen == screen) {
 179       // use this cache item
 180       OtkGCCacheContext_Set(c->ctx, color, font, function, subwindow,
 181                             linewidth);
 182       c->ctx->used = True;
 183       c->count = 1;
 184       c->hits = 1;
 185       return c;
 186     }
 187     // cache fault!
 188     fprintf(stderr, "OtkGCCache: cache fault, count: %d, screen: %d, item screen: %d\n", c->count, screen, c->ctx->screen);
 189     abort();
 190   }
 191
 192   if (c->ctx) {
 193     // reuse existing context
 194     if (font && font->fid && font->fid != c->ctx->fontid)
 195       OtkGCCacheContext_SetFont(c->ctx, font);
 196     c->count++;
 197     c->hits++;
 198     if (prev && c->hits > prev->hits) {
 199       gccache->cache[k] = prev;
 200       gccache->cache[k-1] = c;
 201     }
 202   } else {
 203     c->ctx = OtkGCCache_NextContext(screen);
 204     OtkGCCacheContext_Set(c->ctx, color, font, function, subwindow, linewidth);
 205     c->ctx->used = True;
 206     c->count = 1;
 207     c->hits = 1;
 208   }
 209
 210   return c;
 211 }
 212
 213
 214 void OtkGCCache_Release(OtkGCCacheItem *item)
 215 {
 216   item->count--;
 217 }
 218
 219
 220 void OtkGCCache_Purge()
 221 {
 222   int i;
 223
 224   for (i = 0; i < gccache->cache_total_size; ++i) {
 225     OtkGCCacheItem *d = gccache->cache[i];
 226
 227     if (d->ctx && d->count == 0) {
 228       release(d->ctx);
 229       d->ctx = 0;
 230     }
 231   }
 232 }