private static int CompareValue(ThemeBitmap oldValue, ThemeBitmap newValue)
{
BitmapImage oldImage = LoadImage(oldValue);
BitmapImage newImage = LoadImage(newValue);
int cmp = oldImage.PixelWidth.CompareTo(newImage.PixelWidth);
if (cmp == 0)
{
cmp = oldImage.PixelHeight.CompareTo(newImage.PixelHeight);
}
if (cmp == 0)
{
cmp = oldImage.Format.BitsPerPixel.CompareTo(newImage.Format.BitsPerPixel);
}
if (cmp == 0)
{
int pixelWidth = oldImage.PixelWidth;
int pixelHeight = oldImage.PixelHeight;
int stride = pixelWidth * (oldImage.Format.BitsPerPixel + 7 / 8);
int size = stride * pixelHeight;
var oldPixels = new byte[size];
var newPixels = new byte[size];
oldImage.CopyPixels(Int32Rect.Empty, oldPixels, stride, 0);
newImage.CopyPixels(Int32Rect.Empty, newPixels, stride, 0);
cmp = CompareSequence(oldPixels, newPixels);
}
return(cmp);
}
public ThemeBitmapViewModel(ThemeBitmap themeBitmap)
{
ThemeBitmap = themeBitmap;
bitmap = new Lazy <BitmapImage>(LoadBitmap);
}
private static BitmapImage LoadImage(ThemeBitmap oldValue)
{
using (var stream = oldValue.OpenStream())
return(ImagingUtils.LoadBitmapImageFromStream(stream));
}
