/// <summary>
/// Creates a native <see cref="IBitmapDataInternal"/> by a quantizer session re-using its palette if possible.
/// </summary>
internal static IBitmapDataInternal CreateBitmapData(Bitmap bitmap, ImageLockMode lockMode, IQuantizingSession quantizingSession)
{
if (bitmap == null)
{
throw new ArgumentNullException(nameof(bitmap), PublicResources.ArgumentNull);
}
var pixelFormat = bitmap.PixelFormat;
if (!pixelFormat.IsIndexed() || quantizingSession.Palette == null)
{
return(CreateBitmapData(bitmap, lockMode, quantizingSession.BackColor, quantizingSession.AlphaThreshold));
}
// checking if bitmap and quantizer palette has the same entries
if (!quantizingSession.Palette.Equals(bitmap.Palette.Entries))
{
return(CreateBitmapData(bitmap, lockMode, quantizingSession.BackColor, quantizingSession.AlphaThreshold));
}
if (!lockMode.IsDefined())
{
throw new ArgumentOutOfRangeException(nameof(lockMode), PublicResources.EnumOutOfRange(lockMode));
}
// here the quantizer and the target bitmap uses the same palette
switch (pixelFormat)
{
case PixelFormat.Format8bppIndexed:
return(new NativeBitmapData <NativeBitmapDataRow8I>(bitmap, pixelFormat, lockMode, quantizingSession));
case PixelFormat.Format4bppIndexed:
return(new NativeBitmapData <NativeBitmapDataRow4I>(bitmap, pixelFormat, lockMode, quantizingSession));
case PixelFormat.Format1bppIndexed:
return(new NativeBitmapData <NativeBitmapDataRow1I>(bitmap, pixelFormat, lockMode, quantizingSession));
default:
throw new InvalidOperationException(Res.InternalError($"Unexpected indexed format: {pixelFormat}"));
}
}
/// <summary>
/// Creates a native <see cref="IBitmapDataInternal"/> from a <see cref="Bitmap"/>.
/// </summary>
internal static IBitmapDataInternal CreateBitmapData(Bitmap bitmap, ImageLockMode lockMode, Color32 backColor = default, byte alphaThreshold = 128, Palette?palette = null)
{
if (bitmap == null)
{
throw new ArgumentNullException(nameof(bitmap), PublicResources.ArgumentNull);
}
if (!lockMode.IsDefined())
{
throw new ArgumentOutOfRangeException(nameof(lockMode), PublicResources.EnumOutOfRange(lockMode));
}
Debug.Assert(palette == null || backColor.ToOpaque() == palette.BackColor && alphaThreshold == palette.AlphaThreshold);
var pixelFormat = bitmap.PixelFormat;
switch (pixelFormat)
{
case PixelFormat.Format32bppArgb:
return(new NativeBitmapData <NativeBitmapDataRow32Argb>(bitmap, pixelFormat, lockMode));
case PixelFormat.Format32bppPArgb:
return(new NativeBitmapData <NativeBitmapDataRow32PArgb>(bitmap, pixelFormat, lockMode));
case PixelFormat.Format32bppRgb:
return(new NativeBitmapData <NativeBitmapDataRow32Rgb>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold));
case PixelFormat.Format24bppRgb:
return(new NativeBitmapData <NativeBitmapDataRow24Rgb>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold));
case PixelFormat.Format8bppIndexed:
return(new NativeBitmapData <NativeBitmapDataRow8I>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold, palette));
case PixelFormat.Format4bppIndexed:
return(new NativeBitmapData <NativeBitmapDataRow4I>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold, palette));
case PixelFormat.Format1bppIndexed:
return(new NativeBitmapData <NativeBitmapDataRow1I>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold, palette));
case PixelFormat.Format64bppArgb:
return(new NativeBitmapData <NativeBitmapDataRow64Argb>(bitmap, pixelFormat, lockMode));
case PixelFormat.Format64bppPArgb:
return(new NativeBitmapData <NativeBitmapDataRow64PArgb>(bitmap, pixelFormat, lockMode));
case PixelFormat.Format48bppRgb:
return(new NativeBitmapData <NativeBitmapDataRow48Rgb>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold));
case PixelFormat.Format16bppRgb565:
return(OSUtils.IsWindows
? new NativeBitmapData <NativeBitmapDataRow16Rgb565>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold)
: new NativeBitmapData <NativeBitmapDataRow16Rgb565Via24Bpp>(bitmap, PixelFormat.Format24bppRgb, lockMode, backColor, alphaThreshold));
case PixelFormat.Format16bppRgb555:
return(OSUtils.IsWindows
? new NativeBitmapData <NativeBitmapDataRow16Rgb555>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold)
: new NativeBitmapData <NativeBitmapDataRow16Rgb555Via24Bpp>(bitmap, PixelFormat.Format24bppRgb, lockMode, backColor, alphaThreshold));
case PixelFormat.Format16bppArgb1555:
return(new NativeBitmapData <NativeBitmapDataRow16Argb1555>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold));
case PixelFormat.Format16bppGrayScale:
return(new NativeBitmapData <NativeBitmapDataRow16Gray>(bitmap, pixelFormat, lockMode, backColor, alphaThreshold));
default:
throw new InvalidOperationException(Res.InternalError($"Unexpected pixel format {pixelFormat}"));
}
}