private Bitmap DecodeColorInternal(byte[] data, Size imageSize, IProgressContext progress)
{
// Prepare information and instances
var paddedSize = GetPaddedSize(imageSize);
var swizzle = GetPixelRemapper(_colorEncoding, paddedSize);
var finalSize = GetFinalSize(paddedSize, swizzle);
var colorShader = _shadeColorsFunc?.Invoke();
// Load colors
var colorCount = data.Length * 8 / _colorEncoding.BitsPerValue * _colorEncoding.ColorsPerValue;
var colorCountBySize = finalSize.Width * finalSize.Height;
// HINT: If the data portion does not fit with the actual image size, it will cause progress irregularities.
// If the given data is shorter than what is needed for the full image, we throw.
// Otherwise enough data is given and the image can be fully decoded, even if excess data is not used.
if (colorCount < colorCountBySize)
{
throw new InvalidOperationException("Given data is too short.");
}
var setMaxProgress = progress?.SetMaxValue(colorCountBySize * _colorEncoding.ColorsPerValue);
var colors = _colorEncoding
.Load(data, new EncodingLoadContext(finalSize, _taskCount))
.AttachProgress(setMaxProgress, "Decode colors");
// Apply color shader
if (colorShader != null)
{
colors = colors.Select(colorShader.Read);
}
// Create image with unpadded dimensions
return(colors.ToBitmap(imageSize, paddedSize, swizzle, _anchor));
}
