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Use correct "natural" surface size when computing surface-to-buffer matrix

Vlad Zahorodnii requested to merge work/zzag/implicit-surface-size-s-t-b-matrix into master

If the source rectangle is not set, we need to use the surface size given by the attached buffer. It's computed as buffer size / scale, but the buffer can also be transformed. In other words, we need to compute the natural surface size as follows - buffer size / scale and transpose the result if the buffer is rotated 90 or 270 degrees.

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