private static unsafe BitmapSource ConvertToGrayScale(BitmapSource image, Color biasColor)
{
Validate.IsNotNull(image, nameof(image));
if (image.Format != PixelFormats.Bgra32)
{
throw new ArgumentException();
}
int stride = image.PixelWidth * 4;
int num = image.PixelWidth * image.PixelHeight * 4;
using (ReusableResourceHolder <byte[]> reusableResourceHolder = ImageThemingUtilities.AcquireConversionBuffer(num))
{
byte[] resource = reusableResourceHolder.Resource;
image.CopyPixels(resource, stride, 0);
ImageThemingUtilities.GrayscaleDIBits(resource, num, biasColor);
byte[] numArray;
BitmapSource bitmapSource;
fixed(void *_ = numArray = resource)
{
void *voidPtr;
if (numArray.Length == 0)
{
voidPtr = null;
}
else
fixed(void *tmp = &numArray[0])
{
voidPtr = tmp;
}
bitmapSource = BitmapSource.Create(image.PixelWidth, image.PixelHeight, image.DpiX, image.DpiY, PixelFormats.Bgra32, image.Palette, (IntPtr)voidPtr, num, stride);
}
bitmapSource.Freeze();
return(bitmapSource);
}
}
public static BitmapSource CreateThemedBitmapSource(BitmapSource inputImage, Color backgroundColor, bool isEnabled, Color grayscaleBiasColor, bool isHighContrast)
{
if (inputImage.Format != PixelFormats.Bgra32)
{
inputImage = new FormatConvertedBitmap(inputImage, PixelFormats.Bgra32, null, 0.0);
}
int stride = inputImage.PixelWidth * 4;
int num = inputImage.PixelWidth * inputImage.PixelHeight * 4;
using (ReusableResourceHolder <byte[]> reusableResourceHolder = AcquireConversionBuffer(num))
{
byte[] resource = reusableResourceHolder.Resource;
inputImage.CopyPixels(resource, stride, 0);
uint backgroundRgba = (uint)(backgroundColor.B << 16 | backgroundColor.G << 8) | backgroundColor.R;
ThemeDIBits(num, resource, inputImage.PixelWidth, inputImage.PixelHeight, true, backgroundRgba, isHighContrast);
if (!isEnabled)
{
GrayscaleDIBits(resource, num, grayscaleBiasColor);
}
BitmapSource bitmapSource = BitmapSource.Create(inputImage.PixelWidth, inputImage.PixelHeight, inputImage.DpiX, inputImage.DpiY, PixelFormats.Bgra32, inputImage.Palette, resource, stride);
bitmapSource.Freeze();
return(bitmapSource);
}
}
