如何从RenderTargetBitmap Bitblit到WriteableBitmap？
我将RenderTargetBitmap渲染成几十个视觉效果。 每个都在它自己的Rect中呈现。 我想要做的是将从RenderTargetBitmap实例渲染的这些Rect区域之一复制到WriteableBitmap的相同区域...快速复制矩形像素或smth。 像那样。
那么，有没有办法以快速的方式将RenderTargetBitmap中的rect复制到WriteableBitmap？
提前致谢。
通过像这样将整个RenderTargetBitmap复制到WriteableBitmap解决：
protected override void OnRender(DrawingContext drawingContext)
{
if (ActualWidth == 0 || ActualHeight == 0) return;
// Create destination bitmap
wb = new WriteableBitmap((int) ActualWidth, (int) ActualHeight, 96, 96, PixelFormats.Pbgra32, null);
wb.Lock();
rtb = new RenderTargetBitmap(wb.PixelWidth, wb.PixelHeight, wb.DpiX, wb.DpiY, PixelFormats.Pbgra32);
foreach (MyVisual visual in visuals)
{
visual.Render(rtb);
}
rtb.CopyPixels(new Int32Rect(0,0, rtb.PixelWidth, rtb.PixelHeight),
wb.BackBuffer,
wb.BackBufferStride * wb.PixelHeight, wb.BackBufferStride);
wb.AddDirtyRect(new Int32Rect(0, 0, (int)ActualWidth, (int)ActualHeight));
wb.Unlock();
drawingContext.DrawImage(wb, new Rect(0, 0, ActualWidth, ActualHeight));
}
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