什么是以下
@L_403_0@ SWT代码的WPF等价物？我想从RGBA值列表中创建一个Image并在Canvas上显示.
private Image GetImage()
{
ImageData imageData = new ImageData(imageWidth,imageHeight,32,palette);
int pixelVecLoc=0;
for (int h = 0; h<imageHeight && (pixelVecLoc < currentImagePixelVec.size()); h++)
{
for (int w = 0; w<imageWidth && (pixelVecLoc < currentImagePixelVec.size()); w++)
{
int p = 0;
Pixel pixel = currentImagePixelVec.get(pixelVecLoc);
p = (pixel.Alpha<<24) | (pixel.Red<<16) | (pixel.Green<<8) | pixel.Blue;
imageData.setPixel(w,h,p);
pixelVecLoc++;
}
}
imageData = imageData.scaledTo(imageScaleWidth,imageScaleHeight);
Image image = ImageDescriptor.createFromImageData(imageData).createImage();
return image;
}
然后在Canvas上绘制它：
gc.drawImage(image,0);
解决方法
这是一个简短的片段,展示了如何创建自定义RGBA缓冲区并向其写入像素数据(
based on this example)：
int width = 512;
int height = 256;
int stride = width * 4 + (width % 4);
int pixelWidth = 4; // RGBA (BGRA)
byte[] imageData = new byte[width * stride]; // raw byte buffer
for (int y = 0; y < height; y++)
{
int yPos = y * stride;
for (int x = 0; x < width; x++)
{
int xPos = yPos + x * pixelWidth;
imageData[xPos + 2] = (byte) (RedValue); // replace *Value with source data
imageData[xPos + 1] = (byte) (GreenValue);
imageData[xPos ] = (byte) (BlueValue);
imageData[xPos + 3] = (byte) (AlphaValue);
}
}
然后将BitmapSource.Create Method (Int32, Int32, Double, PixelFormat, BitmapPalette, IntPtr, Int32)方法与PixelFormats一起使用：
BitmapSource bmp =
BitmapSource.Create(
width,height,96,// Horizontal DPI
96,// Vertical DPI
PixelFormats.Bgra32,// 32-bit BGRA
null,// no palette
imageData,// byte buffer
imageData.Length,// buffer size
stride); // stride
请注意,除了代码段中所示的alpha分量(BGRA)之外,字节顺序是反向的.
要将结果传输到画布,您可以先创建一个Image,将BitmapSource设置为Source,最后将其添加到画布：
// create image and set image as source Image BmpImg = New Image(); BmpImg.Width = width; BmpImg.Height = height; BmpImg.Source = bmp; // add image to canvas canvas.Children.Add(BmpImg); Canvas.SetLeft(BmpImg,0); // to set position (x,y) Canvas.SetTop(BmpImg,0);
