This is the first set of patches in an effort to create more generic image loading/conversion code that can eventually be shared.
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v3: d3dx9: Preserve the contents of unaligned compressed destination surfaces.
d3dx9: Split off image decompression into a helper function.
d3dx9: Split D3DXLoadSurfaceFromMemory functionality into a separate function.
d3dx9: Use base image pointer when decompressing source image.
d3dx9/tests: Add more tests for misaligned compressed surface loading.
https://gitlab.winehq.org/wine/wine/-/merge_requests/5202