/// <devdoc>
/// Dispose of all cached WindowsFont objects and reset the collection.
/// </devdoc>
public static void ResetFontCache()
{
if (WindowsFontCache.Count > 0)
{
for (int index = 0; index < WindowsFontCache.Count; index++)
{
WindowsFontCache[index].Value.Dispose();
}
WindowsFontCache.Clear();
currentIndex = -1;
#if GDI_FONT_CACHE_TRACK
Debug.WriteLine("Font cache reset. Count: " + WindowsFontCache.Count);
#endif
}
}
public static WindowsFont GetWindowsFont(Font font, Interop.Gdi32.QUALITY fontQuality)
{
if (font == null)
{
return(null);
}
// First check if font is in the cache.
int count = 0;
int index = currentIndex;
// Search by index of most recently added object.
while (count < WindowsFontCache.Count)
{
if (WindowsFontCache[index].Key.Equals(font)) // don't do shallow comparison, we could miss cloned fonts.
{
// We got a Font in the cache, let's see if we have a WindowsFont with the same quality as required by the caller.
// WARNING: It is not expected that the WindowsFont is disposed externally since it is created by this class.
Debug.Assert(WindowsFontCache[index].Value.Hfont != IntPtr.Zero, "Cached WindowsFont was disposed, enable GDI_FINALIZATION_WATCH to track who did it!");
WindowsFont wf = WindowsFontCache[index].Value;
if (wf.Quality == fontQuality)
{
return(wf);
}
}
index--;
count++;
if (index < 0)
{
index = CacheSize - 1;
}
}
// Font is not in the cache, let's add it.
WindowsFont winFont = WindowsFont.FromFont(font, fontQuality);
KeyValuePair <Font, WindowsFont> newEntry = new KeyValuePair <Font, WindowsFont>(font, winFont);
currentIndex++;
if (currentIndex == CacheSize)
{
currentIndex = 0;
}
if (WindowsFontCache.Count == CacheSize) // No more room, update current index.
{
WindowsFont wfont = null;
// Go through the existing fonts in the cache, and see if any
// are not in use by a DC. If one isn't, replace that. If
// all are in use, new up a new font and do not cache it.
bool finished = false;
int startIndex = currentIndex;
int loopIndex = startIndex + 1;
while (!finished)
{
if (loopIndex >= CacheSize)
{
loopIndex = 0;
}
if (loopIndex == startIndex)
{
finished = true;
}
wfont = WindowsFontCache[loopIndex].Value;
if (!DeviceContexts.IsFontInUse(wfont))
{
currentIndex = loopIndex;
finished = true;
break;
}
else
{
loopIndex++;
wfont = null;
}
}
if (wfont != null)
{
WindowsFontCache[currentIndex] = newEntry;
winFont.OwnedByCacheManager = true;
#if GDI_FONT_CACHE_TRACK
Debug.WriteLine("Removing from cache: " + wfont);
Debug.WriteLine("Adding to cache: " + winFont);
#endif
wfont.OwnedByCacheManager = false;
wfont.Dispose();
}
else
{
// do not cache font - caller is ALWAYS responsible for
// disposing now. If it is owned by the CM, it will not
// disposed.
winFont.OwnedByCacheManager = false;
#if GDI_FONT_CACHE_TRACK
Debug.WriteLine("Creating uncached font: " + winFont);
#endif
}
}
else
{
winFont.OwnedByCacheManager = true;
WindowsFontCache.Add(newEntry);
#if GDI_FONT_CACHE_TRACK
Debug.WriteLine("Adding to cache: " + winFont);
#endif
}
return(winFont);
}
public static WindowsFont GetWindowsFont(Font font, WindowsFontQuality fontQuality)
{
if (font == null)
{
return(null);
}
int num = 0;
int currentIndex = WindowsGraphicsCacheManager.currentIndex;
while (num < WindowsFontCache.Count)
{
KeyValuePair <Font, WindowsFont> pair2 = WindowsFontCache[currentIndex];
if (pair2.Key.Equals(font))
{
KeyValuePair <Font, WindowsFont> pair3 = WindowsFontCache[currentIndex];
WindowsFont font2 = pair3.Value;
if (font2.Quality == fontQuality)
{
return(font2);
}
}
currentIndex--;
num++;
if (currentIndex < 0)
{
currentIndex = 9;
}
}
WindowsFont font3 = WindowsFont.FromFont(font, fontQuality);
KeyValuePair <Font, WindowsFont> item = new KeyValuePair <Font, WindowsFont>(font, font3);
WindowsGraphicsCacheManager.currentIndex++;
if (WindowsGraphicsCacheManager.currentIndex == 10)
{
WindowsGraphicsCacheManager.currentIndex = 0;
}
if (WindowsFontCache.Count != 10)
{
font3.OwnedByCacheManager = true;
WindowsFontCache.Add(item);
return(font3);
}
WindowsFont wf = null;
bool flag = false;
int num3 = WindowsGraphicsCacheManager.currentIndex;
int num4 = num3 + 1;
while (!flag)
{
if (num4 >= 10)
{
num4 = 0;
}
if (num4 == num3)
{
flag = true;
}
KeyValuePair <Font, WindowsFont> pair4 = WindowsFontCache[num4];
wf = pair4.Value;
if (!DeviceContexts.IsFontInUse(wf))
{
WindowsGraphicsCacheManager.currentIndex = num4;
flag = true;
break;
}
num4++;
wf = null;
}
if (wf != null)
{
WindowsFontCache[WindowsGraphicsCacheManager.currentIndex] = item;
font3.OwnedByCacheManager = true;
wf.OwnedByCacheManager = false;
wf.Dispose();
return(font3);
}
font3.OwnedByCacheManager = false;
return(font3);
}
