Why is my bitmap mask rendered stretched?

Question

What would cause either the bitmap or bitmap mask to be stretched, so they do not align?

The image is for testing purposes.

	hr = renderTarget->CreateBitmapBrush(bmap, bmapBrushProps, &bmapBrush);

		hr = renderTarget->CreateBitmapBrush(
			bmapMask, bmapBrushProps, &bmapMaskBrush);


				deviceContext->SetAntialiasMode(D2D1_ANTIALIAS_MODE_ALIASED);

				deviceContext->FillOpacityMask(
					bmapMask,
					bmapBrush,
					D2D1_OPACITY_MASK_CONTENT_GRAPHICS,
					&destRect,
					NULL
				);

				deviceContext->SetAntialiasMode(D2D1_ANTIALIAS_MODE_PER_PRIMITIVE);

Answer 1

1. There is a transform on ID2D1RenderTarget. ID2D1RenderTarget::SetTransform
2. The most important thing is to

Compute the bounds we will pass to FillOpacityMask (which are in Device Independent Pixels) based on DPI.

for more information, see the two examples.

Answer 2

Okay, so I either set the destination and source to NULL, or just specify the source rectangle.

I just need to work on the scale. Thanks.