message: Apply thumbnail resampling fix to dx12.
  See CL
  for full description.
diff: @@ -1521,17 +1521,12 @@ bool WrappedID3D12Device::EndFrameCapture(void *dev, void *wnd)
  {
  ResourceFormat fmt = MakeResourceFormat(desc.Format);
  - float aspect = float(desc.Width) / float(desc.Height);
  -
  thwidth = (uint16_t)RDCMIN(maxSize, (uint32_t)desc.Width);
  thwidth &= ~0x7; // align down to multiple of 8
  - thheight = uint16_t(float(thwidth) / aspect);
  + thheight = uint16_t(thwidth * desc.Height / desc.Width);
  thpixels = new byte[3U * thwidth * thheight];
  - float widthf = float(desc.Width);
  - float heightf = float(desc.Height);
  -
  uint32_t stride = fmt.compByteWidth * fmt.compCount;
  bool buf1010102 = false;
  @@ -1549,11 +1544,10 @@ bool WrappedID3D12Device::EndFrameCapture(void *dev, void *wnd)
  {
  for(uint32_t x = 0; x < thwidth; x++)
  {
  - float xf = float(x) / float(thwidth);
  - float yf = float(y) / float(thheight);
  + uint32_t xSource = uint32_t(x * desc.Width / thwidth);
  + uint32_t ySource = uint32_t(y * desc.Height / thheight);
  - byte *srcPixels = &data[stride * uint32_t(xf * widthf) +
  - layout.Footprint.RowPitch * uint32_t(yf * heightf)];
  + byte *srcPixels = &data[stride * xSource + layout.Footprint.RowPitch * ySource];
  if(buf1010102)
  {
  