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

   1 // -*- mode: C; indent-tabs-mode: nil; c-basic-offset: 2; -*-
   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 = NULL;
  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 = color->pixel;
  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   return self;
  86 }
  87
  88
  89 void OtkGCCache_Initialize()
  90 {
  91   unsigned int i;
  92
  93   gccache = malloc(sizeof(OtkGCCache));
  94
  95   gccache->context_count = 128;
  96   gccache->cache_size = 16;
  97   gccache->cache_buckets = 8 * ScreenCount(OBDisplay->display);
  98   gccache->cache_total_size = gccache->cache_size * gccache->cache_buckets;
  99
 100   gccache->contexts = malloc(sizeof(OtkGCCacheContext*) *
 101                              gccache->context_count);
 102   for (i = 0; i < gccache->context_count; ++i)
 103     gccache->contexts[i] = OtkGCCacheContext_New();
 104
 105   gccache->cache = malloc(sizeof(OtkGCCacheItem*) * gccache->cache_total_size);
 106   for (i = 0; i < gccache->cache_total_size; ++i)
 107     gccache->cache[i] = OtkGCCacheItem_New();
 108 }
 109
 110
 111 /*void OtkGCCache_Destroy()
 112 {
 113   unsigned int i;
 114
 115   for (i = 0; i < gccache->context_count; ++i)
 116     OtkGCCacheContext_Destroy(gccache->contexts[i]);
 117
 118   for (i = 0; i < gccache->cache_total_size; ++i)
 119     free(gccache->cache[i]);
 120
 121   free(gccache->contexts);
 122   free(gccache->cache);
 123   free(gccache);
 124   gccache = NULL;
 125 }*/
 126
 127 static OtkGCCacheContext *nextContext(int screen)
 128 {
 129   Window hd = OtkDisplay_ScreenInfo(OBDisplay, screen)->root_window;
 130   OtkGCCacheContext *c;
 131   unsigned int i;
 132
 133   for (i = 0; i < gccache->context_count; ++i) {
 134     c = gccache->contexts[i];
 135
 136     if (! c->gc) {
 137       c->gc = XCreateGC(OBDisplay->display, hd, 0, 0);
 138       c->used = False;
 139       c->screen = screen;
 140     }
 141     if (! c->used && c->screen == screen)
 142       return c;
 143   }
 144
 145   fprintf(stderr, "OtkGCCache: context fault!\n");
 146   abort();
 147   return NULL; // shut gcc up
 148 }
 149
 150
 151 static void OtkGCCache_InternalRelease(OtkGCCacheContext *ctx)
 152 {
 153   ctx->used = False;
 154 }
 155
 156 OtkGCCacheItem *OtkGCCache_Find(OtkColor *color, XFontStruct *font,
 157                                 int function, int subwindow, int linewidth)
 158 {
 159   const unsigned long pixel = color->pixel;
 160   const int screen = color->screen;
 161   const int key = color->red ^ color->green ^ color->blue;
 162   int k = (key % gccache->cache_size) * gccache->cache_buckets;
 163   unsigned int i = 0; // loop variable
 164   OtkGCCacheItem *c = gccache->cache[k], *prev = 0;
 165
 166   /*
 167     this will either loop cache_buckets times then return/abort or
 168     it will stop matching
 169   */
 170   while (c->ctx &&
 171          (c->ctx->pixel != pixel || c->ctx->function != function ||
 172           c->ctx->subwindow != subwindow || c->ctx->screen != screen ||
 173           c->ctx->linewidth != linewidth)) {
 174     if (i < (gccache->cache_buckets - 1)) {
 175       prev = c;
 176       c = gccache->cache[++k];
 177       ++i;
 178       continue;
 179     }
 180     if (c->count == 0 && c->ctx->screen == screen) {
 181       // use this cache item
 182       OtkGCCacheContext_Set(c->ctx, color, font, function, subwindow,
 183                             linewidth);
 184       c->ctx->used = True;
 185       c->count = 1;
 186       c->hits = 1;
 187       return c;
 188     }
 189     // cache fault!
 190     fprintf(stderr, "OtkGCCache: cache fault, count: %d, screen: %d, item screen: %d\n", c->count, screen, c->ctx->screen);
 191     abort();
 192   }
 193
 194   if (c->ctx) {
 195     // reuse existing context
 196     if (font && font->fid && font->fid != c->ctx->fontid)
 197       OtkGCCacheContext_SetFont(c->ctx, font);
 198     c->count++;
 199     c->hits++;
 200     if (prev && c->hits > prev->hits) {
 201       gccache->cache[k] = prev;
 202       gccache->cache[k-1] = c;
 203     }
 204   } else {
 205     c->ctx = nextContext(screen);
 206     OtkGCCacheContext_Set(c->ctx, color, font, function, subwindow, linewidth);
 207     c->ctx->used = True;
 208     c->count = 1;
 209     c->hits = 1;
 210   }
 211
 212   return c;
 213 }
 214
 215
 216 void OtkGCCache_Release(OtkGCCacheItem *item)
 217 {
 218   item->count--;
 219 }
 220
 221
 222 void OtkGCCache_Purge()
 223 {
 224   unsigned int i;
 225
 226   for (i = 0; i < gccache->cache_total_size; ++i) {
 227     OtkGCCacheItem *d = gccache->cache[i];
 228
 229     if (d->ctx && d->count == 0) {
 230       OtkGCCache_InternalRelease(d->ctx);
 231       d->ctx = 0;
 232     }
 233   }
 234 }