如何为Windows 8商店应用程序的XAML中的UI元素(如StackPanel
或Rectangle
)添加模糊效果?
我正在考虑WPF中的BlurEffect
,as demonstrated here。任何解决方案都应该适合动画,或者至少每秒更新一次。
答案 0 :(得分:0)
您可以使用this库模糊并写入图像。
它可能看起来像这样:
// Blit a bitmap using the additive blend mode at P1(10, 10)
writeableBmp.Blit(new Point(10, 10), bitmap, sourceRect, Colors.White, WriteableBitmapExtensions.BlendMode.Additive);
或者,您可以自己编写(或使用别人写的代码),类似于this:
private static Bitmap Blur(Bitmap image, Rectangle rectangle, Int32 blurSize)
{
Bitmap blurred = new Bitmap(image.Width, image.Height);
// make an exact copy of the bitmap provided
using(Graphics graphics = Graphics.FromImage(blurred))
graphics.DrawImage(image, new Rectangle(0, 0, image.Width, image.Height),
new Rectangle(0, 0, image.Width, image.Height), GraphicsUnit.Pixel);
// look at every pixel in the blur rectangle
for (Int32 xx = rectangle.X; xx < rectangle.X + rectangle.Width; xx++)
{
for (Int32 yy = rectangle.Y; yy < rectangle.Y + rectangle.Height; yy++)
{
Int32 avgR = 0, avgG = 0, avgB = 0;
Int32 blurPixelCount = 0;
// average the color of the red, green and blue for each pixel in the
// blur size while making sure you don't go outside the image bounds
for (Int32 x = xx; (x < xx + blurSize && x < image.Width); x++)
{
for (Int32 y = yy; (y < yy + blurSize && y < image.Height); y++)
{
Color pixel = blurred.GetPixel(x, y);
avgR += pixel.R;
avgG += pixel.G;
avgB += pixel.B;
blurPixelCount++;
}
}
avgR = avgR / blurPixelCount;
avgG = avgG / blurPixelCount;
avgB = avgB / blurPixelCount;
// now that we know the average for the blur size, set each pixel to that color
for (Int32 x = xx; x < xx + blurSize && x < image.Width && x < rectangle.Width; x++)
for (Int32 y = yy; y < yy + blurSize && y < image.Height && y < rectangle.Height; y++)
blurred.SetPixel(x, y, Color.FromArgb(avgR, avgG, avgB));
}
}
return blurred;
}
要获取第二种方法的各个像素,请参阅here:
BitmapImage iSrc
var array = new int[iSrc.PixelWidth * iSrc.PixelHeight]
var rect = new Int32Rect(0, 0, iSrc.PixelWidth, iSrc.PixelHeight)
iSrc.CopyPixels(rect, array, iSrc.PixelWidth * 4, 0)