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Vilson Vieira authored
Rotate a given buffer, translating to its center first. After rotation, calculate the amount needed to keep the produced extent on the positive quadrant (always having the origin at its top-left corner). Then translate that amount. Everything is done with an unique affine matrix. Because always translate to center, both origin-x and origin-y parameters are ignored. Their descriptions are changed to inform about that. Composition test includes a crop step to make it sure we have origin at top-left.
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