public PixelStorageOptions CalculatePixelStorageOptions(
ImageFormat outputFormat,
PixelStorage storageMode,
ImageDimensions imageDimensions,
long totalBytes)
{
if (storageMode == PixelStorage.Auto)
{
long requiredBits = totalBytes * 8;
long totalPixels = Math.BigMul(imageDimensions.Width, imageDimensions.Height * (imageDimensions.Frames ?? 1));
foreach (PixelStorage storage in new[] { PixelStorage.Low, PixelStorage.Medium, PixelStorage.High })
{
PixelStorageOptions storageOptions = PixelStorageWithBitsPerChannel(outputFormat, storage);
if (totalPixels * storageOptions.BitsPerPixel >= requiredBits)
{
return(storageOptions);
}
}
return(PixelStorageWithBitsPerChannel(outputFormat, PixelStorage.High));
}
return(PixelStorageWithBitsPerChannel(outputFormat, storageMode));
}
private PixelStorageOptions PixelStorageWithBitsPerChannel(ImageFormat outputFormat, PixelStorage storage)
{
switch (storage)
{
case PixelStorage.High:
return(outputFormat.PixelStorageWithBitsPerChannel(4, BitStorageMode.LeastSignificantBits));
case PixelStorage.Medium:
return(outputFormat.PixelStorageWithBitsPerChannel(2, BitStorageMode.LeastSignificantBits));
case PixelStorage.Low:
return(outputFormat.PixelStorageWithBitsPerChannel(1, BitStorageMode.LeastSignificantBits));
default:
throw new ArgumentOutOfRangeException("storage");
}
}
