如何从 Texture2D 获取原始像素数据？

问题描述

我试图从 SharpDX Texture2D 获取像素（rgba）值，然后将它们分配给位图，但我得到了这个错误的图像：

我知道问题是当我从 srcPtr 读取值时（见下面的代码），我认为偏移量是错误的...

这是代码：

SharpDX.DXGI.Resource screenResource;
OutputDuplicateFrameInformation duplicateFrameInformation;

// Try to get duplicated frame within given time is ms
duplicatedOutput.AcquireNextFrame(5,out duplicateFrameInformation,out screenResource);

// copy resource into memory that can be accessed by the CPU
using (var screenTexture2D = screenResource.QueryInterface<Texture2D>())
    device.ImmediateContext.CopyResource(screenTexture2D,screenTexture);

// Get the desktop capture texture
var mapSource = device.ImmediateContext.MapSubresource(screenTexture,MapMode.Read,SharpDX.Direct3D11.MapFlags.None);

// Create Drawing.Bitmap
using (var bitmap = new Bitmap(width,height,PixelFormat.Format32bppArgb))
{
    var boundsRect = new Rectangle(0,width,height);

    // Copy pixels from screen capture Texture to GDI bitmap
    var mapDest = bitmap.LockBits(boundsRect,ImageLockMode.ReadOnly,bitmap.PixelFormat);

    unsafe
    {
        byte* srcPtr = (byte*)mapSource.DataPointer;
        byte* destPtr = (byte*)mapDest.Scan0;

        var curRowOffs = 0;
        var stride = width * 4;

        byte[] rgbaValues = new byte[width*height*4];

        for (uint y = 0; y < height; y++)
        {

            var index = curRowOffs;


            for (uint x = 0; x < width; x++)
            {
                // ARGB = bytes [B,G,R,A]
                rgbaValues[index] = srcPtr[index];
                rgbaValues[index + 1] = srcPtr[index + 1];
                rgbaValues[index + 2] = srcPtr[index + 2];
                rgbaValues[index + 3] = srcPtr[index + 3];

                //Copy rgba to bitmap
                destPtr[index + 3] = srcPtr[index + 3];
                destPtr[index + 2] = srcPtr[index + 2];
                destPtr[index + 1] = srcPtr[index + 1];
                destPtr[index] = srcPtr[index];


                index += 4;
            }

            // Increase row offset
            curRowOffs += stride;

        }
    }

    // Release source and dest locks
    bitmap.UnlockBits(mapDest);
    device.ImmediateContext.UnmapSubresource(screenTexture,0);

我在这里做错了什么？ 如何将原始像素数据放入字节数组？

解决方法

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