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    • Vilson Vieira's avatar
      Add rotate-on-center operation · c7f4aba6
      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.
      c7f4aba6