从一个图像复制的投资回报率，并复制到另一个WPF图像上

问题描述

我要开发具有以下签名的函数：

I want to develop a function with the following signature:

 CopyImage(ImageSource inputImage, Point inTopLeft, Point InBottomRight, ImageSource outputImage, Point outTopLeft);

这输入图像（ROI由inTopLeft和inBottomRight定义）和功能拷贝一部分它复制到o​​utputImage在outTopLeft。

This function copy part of input image (ROI defined by inTopLeft and inBottomRight) and copy it to outputImage at outTopLeft.

我可以通过操纵像素为此在WPF中，但我要寻找一个解决方案，可以做到这一点要快得多。

I can do this in WPF by manipulating pixels, but I am looking for a solution that can do it much faster.

什么是WPF做到这一点的最快方法？

What is the fastest way to do this in WPF?

推荐答案

您的方法可能是这样的：

Your method could look like this:

private BitmapSource CopyRegion(
    BitmapSource sourceBitmap, Int32Rect sourceRect,
    BitmapSource targetBitmap, int targetX, int targetY)
{
    if (sourceBitmap.Format != targetBitmap.Format)
    {
        throw new ArgumentException(
            "Source and target bitmap must have the same PixelFormat.");
    }

    var bytesPerPixel = (sourceBitmap.Format.BitsPerPixel + 7) / 8;
    var stride = bytesPerPixel * sourceRect.Width;
    var pixelBuffer = new byte[stride * sourceRect.Height];
    sourceBitmap.CopyPixels(sourceRect, pixelBuffer, stride, 0);

    var outputBitmap = new WriteableBitmap(targetBitmap);
    sourceRect.X = targetX;
    sourceRect.Y = targetY;
    outputBitmap.WritePixels(sourceRect, pixelBuffer, stride, 0);

    return outputBitmap;
}

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