private DeviceContext(IntPtr hWnd)
{
this.hWnd = (IntPtr)(-1);
this.hWnd = hWnd;
this.dcType = System.Windows.Forms.Internal.DeviceContextType.Display;
DeviceContexts.AddDeviceContext(this);
}
internal void Dispose(bool disposing)
{
bool deletedHandle = false;
if (_ownHandle)
{
if (!_ownedByCacheManager || !disposing)
{
// If we were ever owned by the CacheManger and we're being disposed
// we can be sure that we're not in use by any DC's (otherwise Dispose() wouldn't have been called)
// skip the check IsFontInUse check in this case.
// Also skip the check if disposing == false, because the cache is thread-static
// and that means we're being called from the finalizer.
if (_everOwnedByCacheManager || !disposing || !DeviceContexts.IsFontInUse(this))
{
Debug.Assert(Hfont != IntPtr.Zero, "Unexpected null hFont.");
DbgUtil.AssertFinalization(this, disposing);
Interop.Gdi32.DeleteObject(Hfont);
Hfont = IntPtr.Zero;
_ownHandle = false;
deletedHandle = true;
}
}
}
if (disposing && (deletedHandle || !_ownHandle))
{
GC.SuppressFinalize(this);
}
}
/// <summary>
/// Constructor to contruct a DeviceContext object from an window handle.
/// </summary>
private DeviceContext(IntPtr hWnd)
{
_hWnd = hWnd;
DeviceContextType = DeviceContextType.Display;
DeviceContexts.AddDeviceContext(this);
// the hDc will be created on demand.
}
private DeviceContext(IntPtr hDC, System.Windows.Forms.Internal.DeviceContextType dcType)
{
this.hWnd = (IntPtr)(-1);
this.hDC = hDC;
this.dcType = dcType;
this.CacheInitialState();
DeviceContexts.AddDeviceContext(this);
if (dcType == System.Windows.Forms.Internal.DeviceContextType.Display)
{
this.hWnd = IntUnsafeNativeMethods.WindowFromDC(new HandleRef(this, this.hDC));
}
}
/// <summary>
/// Constructor to contruct a DeviceContext object from an existing Win32 device context handle.
/// </summary>
private DeviceContext(IntPtr hDC, DeviceContextType dcType)
{
_hDC = hDC;
DeviceContextType = dcType;
CacheInitialState();
DeviceContexts.AddDeviceContext(this);
if (dcType == DeviceContextType.Display)
{
_hWnd = User32.WindowFromDC(new HandleRef(this, this._hDC));
}
}
/// <summary>
/// Constructor to contruct a DeviceContext object from an existing Win32 device context handle.
/// </summary>
private DeviceContext(Gdi32.HDC hDC, DeviceContextType dcType)
{
_hDC = hDC;
DeviceContextType = dcType;
CacheInitialState();
DeviceContexts.AddDeviceContext(this);
if (dcType == DeviceContextType.Display)
{
_hWnd = User32.WindowFromDC(this);
}
}
/// <summary>
/// Constructor to contruct a DeviceContext object from an window handle.
/// </summary>
private DeviceContext(IntPtr hWnd)
{
_hWnd = hWnd;
DeviceContextType = DeviceContextType.Display;
DeviceContexts.AddDeviceContext(this);
// the hDc will be created on demand.
#if TRACK_HDC
Debug.WriteLine(DbgUtil.StackTraceToStr(String.Format("DeviceContext( hWnd=0x{0:x8} )", unchecked ((int)hWnd))));
#endif
}
/// <summary>
/// Constructor to contruct a DeviceContext object from an existing Win32 device context handle.
/// </summary>
private DeviceContext(IntPtr hDC, DeviceContextType dcType)
{
_hDC = hDC;
DeviceContextType = dcType;
CacheInitialState();
DeviceContexts.AddDeviceContext(this);
if (dcType == DeviceContextType.Display)
{
_hWnd = User32.WindowFromDC(new HandleRef(this, this._hDC));
}
#if TRACK_HDC
Debug.WriteLine(DbgUtil.StackTraceToStr(String.Format("DeviceContext( hDC=0x{0:X8}, Type={1} )", unchecked ((int)hDC), dcType)));
#endif
}
internal void DisposeFont(bool disposing)
{
if (disposing)
{
DeviceContexts.RemoveDeviceContext(this);
}
if ((this.selectedFont != null) && (this.selectedFont.Hfont != IntPtr.Zero))
{
if (IntUnsafeNativeMethods.GetCurrentObject(new HandleRef(this, this.hDC), 6) == this.selectedFont.Hfont)
{
IntUnsafeNativeMethods.SelectObject(new HandleRef(this, this.Hdc), new HandleRef(null, this.hInitialFont));
IntPtr hInitialFont = this.hInitialFont;
}
this.selectedFont.Dispose(disposing);
this.selectedFont = null;
}
}
internal void DisposeFont(bool disposing)
{
if (disposing)
{
DeviceContexts.RemoveDeviceContext(this);
}
if (selectedFont != null && selectedFont.Hfont != IntPtr.Zero)
{
IntPtr hCurrentFont = Interop.Gdi32.GetCurrentObject(new HandleRef(this, hDC), Interop.Gdi32.ObjectType.OBJ_FONT);
if (hCurrentFont == selectedFont.Hfont)
{
// select initial font back in
Interop.Gdi32.SelectObject(new HandleRef(this, Hdc), hInitialFont);
hCurrentFont = hInitialFont;
}
selectedFont.Dispose(disposing);
selectedFont = null;
}
}
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);
}
internal void Dispose(bool disposing)
{
bool flag = false;
if ((this.ownHandle && (!this.ownedByCacheManager || !disposing)) && ((this.everOwnedByCacheManager || !disposing) || !DeviceContexts.IsFontInUse(this)))
{
IntUnsafeNativeMethods.DeleteObject(new HandleRef(this, this.hFont));
this.hFont = IntPtr.Zero;
this.ownHandle = false;
flag = true;
}
if (disposing && (flag || !this.ownHandle))
{
GC.SuppressFinalize(this);
}
}
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);
}