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render/pixman: Improve transform performance

David Turner requested to merge david.turner/wlroots:pixman_transform_perf into master

The old code to render transformed textures with pixman would run composite over the whole output regardless of the texture size. When rendering something small this caused a huge performance hit.

Rewrite the transform branch of render_pass_add_texture to:

  • Only composite over the rectangle we're drawing to
  • Apply a half-pixel offset to match other GPU-based renderers
  • Generally try to make things a lot clearer and some comments

Fixes: #3832 (closed)

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