private (byte[] indexData, byte[] paletteData) EncodeIndexInternal(Bitmap image, IProgressContext progress = null)
{
// Prepare information and instances
var paddedSize = GetPaddedSize(image.Size);
var swizzle = GetPixelRemapper(_indexEncoding, paddedSize);
var finalSize = GetFinalSize(paddedSize, swizzle);
var(indices, palette) = QuantizeImage(image, paddedSize, swizzle, progress);
// Save palette colors
// This step can be skipped if no palette encoding is given.
// That saves time in the scenario when the palette is not needed or already exists as encoded data from somewhere else.
var paletteData = _paletteEncoding?.Save(palette, new EncodingSaveContext(new Size(1, palette.Count), _taskCount));
// Save image indexColors
var indexData = _indexEncoding.Save(indices, palette, new EncodingSaveContext(finalSize, _taskCount));
return(indexData, paletteData);
}
private byte[] EncodeColorInternal(Bitmap image, IProgressContext progress = null)
{
// Prepare information and instances
var paddedSize = GetPaddedSize(image.Size);
var swizzle = GetPixelRemapper(_colorEncoding, paddedSize);
var finalSize = GetFinalSize(paddedSize, swizzle);
var colorShader = _shadeColorsFunc?.Invoke();
// If we have quantization enabled
IEnumerable <Color> colors;
if (_quantizer != null)
{
var scopedProgresses = progress?.SplitIntoEvenScopes(2);
// HINT: Color shader is applied by QuantizeImage
var(indices, palette) = QuantizeImage(image, paddedSize, swizzle, scopedProgresses?[0]);
// Recompose indices to colors
var setMaxProgress = scopedProgresses?[1]?.SetMaxValue(finalSize.Width * finalSize.Height);
colors = indices.ToColors(palette).AttachProgress(setMaxProgress, "Encode indices");
}
else
{
// Decompose image to colors
var setMaxProgress = progress?.SetMaxValue(finalSize.Width * finalSize.Height);
colors = image.ToColors(paddedSize, swizzle, _anchor).AttachProgress(setMaxProgress, "Encode colors");
// Apply color shader
if (colorShader != null)
{
colors = colors.Select(colorShader.Write);
}
}
// Save color data
return(_colorEncoding.Save(colors, new EncodingSaveContext(finalSize, _taskCount)));
}
