adding toolkit beginnings

1 files changed, 188 insertions, 0 deletions

diff --git a/otk/gccache.cc b/otk/gccache.cc
new file mode 100644
index 00000000..2ab37f34
--- /dev/null
+++ b/otk/gccache.cc
@@ -0,0 +1,188 @@
+// -*- 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 "gccache.hh"
+#include "basedisplay.hh"
+#include "color.hh"
+#include "util.hh"
+
+
+BGCCacheContext::~BGCCacheContext(void) {
+  if (gc)
+    XFreeGC(display->getXDisplay(), gc);
+}
+
+
+void BGCCacheContext::set(const BColor &_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->getXDisplay(), gc, mask, &gcv);
+}
+
+
+void BGCCacheContext::set(const XFontStruct * const _font) {
+  if (! _font) {
+    fontid = 0;
+    return;
+  }
+
+  XGCValues gcv;
+  fontid = gcv.font = _font->fid;
+  XChangeGC(display->getXDisplay(), gc, GCFont, &gcv);
+}
+
+
+BGCCache::BGCCache(const BaseDisplay * const _display,
+                   unsigned int screen_count)
+  : display(_display),  context_count(128u),
+    cache_size(16u), cache_buckets(8u * screen_count),
+    cache_total_size(cache_size * cache_buckets) {
+
+  contexts = new BGCCacheContext*[context_count];
+  unsigned int i;
+  for (i = 0; i < context_count; i++) {
+    contexts[i] = new BGCCacheContext(display);
+  }
+
+  cache = new BGCCacheItem*[cache_total_size];
+  for (i = 0; i < cache_total_size; ++i) {
+    cache[i] = new BGCCacheItem;
+  }
+}
+
+
+BGCCache::~BGCCache(void) {
+  std::for_each(contexts, contexts + context_count, PointerAssassin());
+  std::for_each(cache, cache + cache_total_size, PointerAssassin());
+  delete [] cache;
+  delete [] contexts;
+}
+
+
+BGCCacheContext *BGCCache::nextContext(unsigned int scr) {
+  Window hd = display->getScreenInfo(scr)->getRootWindow();
+
+  BGCCacheContext *c;
+
+  for (unsigned int i = 0; i < context_count; ++i) {
+    c = contexts[i];
+
+    if (! c->gc) {
+      c->gc = XCreateGC(display->getXDisplay(), hd, 0, 0);
+      c->used = false;
+      c->screen = scr;
+    }
+    if (! c->used && c->screen == scr)
+      return c;
+  }
+
+  fprintf(stderr, "BGCCache: context fault!\n");
+  abort();
+  return (BGCCacheContext*) 0; // not reached
+}
+
+
+void BGCCache::release(BGCCacheContext *ctx) {
+  ctx->used = false;
+}
+
+
+BGCCacheItem *BGCCache::find(const BColor &_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
+  BGCCacheItem *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, "BGCCache: 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 BGCCache::release(BGCCacheItem *_item) {
+  _item->count--;
+}
+
+
+void BGCCache::purge(void) {
+  for (unsigned int i = 0; i < cache_total_size; ++i) {
+    BGCCacheItem *d = cache[ i ];
+
+    if (d->ctx && d->count == 0) {
+      release(d->ctx);
+      d->ctx = 0;
+    }
+  }
+}