internal BitmapPalette(WICPaletteType paletteType,
bool addtransparentColor)
{
switch (paletteType)
{
case WICPaletteType.WICPaletteTypeFixedBW:
case WICPaletteType.WICPaletteTypeFixedHalftone8:
case WICPaletteType.WICPaletteTypeFixedHalftone27:
case WICPaletteType.WICPaletteTypeFixedHalftone64:
case WICPaletteType.WICPaletteTypeFixedHalftone125:
case WICPaletteType.WICPaletteTypeFixedHalftone216:
case WICPaletteType.WICPaletteTypeFixedHalftone252:
case WICPaletteType.WICPaletteTypeFixedHalftone256:
case WICPaletteType.WICPaletteTypeFixedGray4:
case WICPaletteType.WICPaletteTypeFixedGray16:
case WICPaletteType.WICPaletteTypeFixedGray256:
break;
default:
throw new System.ArgumentException(SR.Get(SRID.Image_PaletteFixedType, paletteType));
}
_palette = CreateInternalPalette();
HRESULT.Check(UnsafeNativeMethods.WICPalette.InitializePredefined(
_palette,
paletteType,
addtransparentColor));
// Fill in the Colors property.
UpdateManaged();
}
internal static extern int /* HRESULT */ InitializeFormatConverter(
IntPtr /* IWICFormatConverter */ THIS_PTR,
IntPtr /* IWICBitmapSource */ source,
ref Guid dstFormat,
int dither,
IntPtr /* IWICBitmapPalette */ bitmapPalette,
double alphaThreshold,
WICPaletteType paletteTranslate);
internal static extern int /* HRESULT */ InitializeFormatConverter(
IntPtr /* IWICFormatConverter */ THIS_PTR,
IntPtr /* IWICBitmapSource */ source,
ref Guid dstFormat,
int dither,
IntPtr /* IWICBitmapPalette */ bitmapPalette,
double alphaThreshold,
WICPaletteType paletteTranslate);
static internal Imaging.BitmapPalette FromMILPaletteType(WICPaletteType type, bool hasAlpha)
{
int key = (int)type;
Debug.Assert(key < c_maxPalettes);
Imaging.BitmapPalette palette;
Imaging.BitmapPalette[] palettes;
if (hasAlpha)
{
palettes = transparentPalettes;
}
else
{
palettes = opaquePalettes;
}
palette = palettes[key];
if (palette == null)
{
lock (palettes)
{
// palettes might have changed while waiting for the lock.
// Need to check again.
palette = palettes[key];
if (palette == null)
{
palette = new Imaging.BitmapPalette(type, hasAlpha);
palettes[key] = palette;
}
}
}
return(palette);
}
internal BitmapPalette(WICPaletteType paletteType,
bool addtransparentColor)
{
switch (paletteType)
{
case WICPaletteType.WICPaletteTypeFixedBW:
case WICPaletteType.WICPaletteTypeFixedHalftone8:
case WICPaletteType.WICPaletteTypeFixedHalftone27:
case WICPaletteType.WICPaletteTypeFixedHalftone64:
case WICPaletteType.WICPaletteTypeFixedHalftone125:
case WICPaletteType.WICPaletteTypeFixedHalftone216:
case WICPaletteType.WICPaletteTypeFixedHalftone252:
case WICPaletteType.WICPaletteTypeFixedHalftone256:
case WICPaletteType.WICPaletteTypeFixedGray4:
case WICPaletteType.WICPaletteTypeFixedGray16:
case WICPaletteType.WICPaletteTypeFixedGray256:
break;
default:
throw new System.ArgumentException(SR.Get(SRID.Image_PaletteFixedType, paletteType));
}
_palette = CreateInternalPalette();
HRESULT.Check(UnsafeNativeMethods.WICPalette.InitializePredefined(
_palette,
paletteType,
addtransparentColor));
// Fill in the Colors property.
UpdateManaged();
}
static internal Imaging.BitmapPalette FromMILPaletteType(WICPaletteType type, bool hasAlpha)
{
int key = (int)type;
Debug.Assert(key < c_maxPalettes);
Imaging.BitmapPalette palette;
Imaging.BitmapPalette[] palettes;
if (hasAlpha)
{
palettes = transparentPalettes;
}
else
{
palettes = opaquePalettes;
}
palette = palettes[key];
if (palette == null)
{
lock (palettes)
{
// palettes might have changed while waiting for the lock.
// Need to check again.
palette = palettes[key];
if (palette == null)
{
palette = new Imaging.BitmapPalette(type, hasAlpha);
palettes[key] = palette;
}
}
}
return palette;
}
internal static extern int /* HRESULT */ GetType(System.Windows.Media.SafeMILHandle /* IWICPalette */ THIS_PTR,
out WICPaletteType pePaletteType);
internal static extern int /* HRESULT */ InitializePredefined(System.Windows.Media.SafeMILHandle /* IWICPalette */ THIS_PTR,
WICPaletteType ePaletteType,
bool fAddTransparentColor);
internal static extern int /* HRESULT */ Initialize(
System.Windows.Media.SafeMILHandle /* IWICFormatConverter */ THIS_PTR,
System.Windows.Media.SafeMILHandle /* IWICBitmapSource */ source,
ref Guid dstFormat,
DitherType dither,
System.Windows.Media.SafeMILHandle /* IWICBitmapPalette */ bitmapPalette,
double alphaThreshold,
WICPaletteType paletteTranslate
);
