/// <summary>Extracts a sub image using the given mask and brightness.</summary>
private Texture2D ExtractSubImage(Texture2D source, Texture2D mask, Desaturation.Mode desaturationMode, float brightness)
{
// Size checks.
if (mask != null)
{
if (source.Width != mask.Width)
{
throw new ArgumentException($"Widths of image and mask don't match: {source.Width} != {mask.Width}");
}
if (source.Height < mask.Height)
{
monitor_.Log($"Height of the image is less than height of the mask: {source.Height} < {mask.Height}", LogLevel.Info);
}
else if (source.Height > mask.Height)
{
monitor_.Log($"Height of the image is greater than height of the mask. Parts of the image not covered by mask won't be recolored: {source.Height} > {mask.Height}", LogLevel.Warn);
}
}
if (brightness < 0.0f)
{
throw new ArgumentException("Brightness must not be negative");
}
Color[] sourcePixels = Utility.TextureToArray(source);
Color[] maskPixels = mask != null?Utility.TextureToArray(mask) : null;
Color[] extractedPixels = new Color[source.Width * source.Height];
// If mask is null recolor the whole image.
var getMaskValue = maskPixels == null ? (Func <Color[], int, byte>)((p, i) => (byte)0xFF)
: GetMaskValue;
for (int i = 0; i < sourcePixels.Length; i++)
{
Color pixel = Desaturation.Desaturate(sourcePixels[i], desaturationMode);
byte maskValue = getMaskValue(maskPixels, i);
// Multiplication is all we need: If maskValue is zero the resulting pixel is zero (TransparentBlack).
// Clamping is done automatically on assignment.
extractedPixels[i] = pixel * (maskValue / 255.0f) * brightness;
}
return(Utility.ArrayToTexture(extractedPixels, source.Width, source.Height));
}
/// <summary>Extracts a sub image using the given mask.</summary>
private Texture2D ExtractSubImage(Texture2D source, Texture2D mask, Desaturation.Mode desaturationMode)
{
if (mask.Width != source.Width || mask.Height != source.Height)
{
throw new ArgumentException("Sizes of image and mask don't match");
}
Color[] sourcePixels = Utility.TextureToArray(source);
Color[] maskPixels = Utility.TextureToArray(mask);
Color[] extractedPixels = new Color[source.Width * source.Height];
for (int i = 0; i < sourcePixels.Length; i++)
{
Color pixel = Desaturation.Desaturate(sourcePixels[i], desaturationMode);
// Treat mask as grayscale (luma).
byte maskValue = Desaturation.Desaturate(maskPixels[i], Desaturation.Mode.DesaturateLuma).R;
// Multiplication is all we need: If maskValue is zero the resulting pixel is zero (TransparentBlack).
extractedPixels[i] = pixel * (maskValue / 255.0f);
}
return(Utility.ArrayToTexture(extractedPixels, source.Width, source.Height));
}
