Viktor 24951a7ee7 gpu, op, internal/ops: add affine transformations ...

Add support for affine transformations. The key changes are outlined
below.

- Painting/clipping with rectangles is handled by, for complex
  transforms, creating clipping paths representing the transformed
  rectangle and using a larger bounding box. Cover/Blit shaders updated
  correspondingly to correctly map texture cordinates from the new
  bounding boxes.
- Since path splitting must happen on CPU the transforms must happen CPU
  side as well - offsets removed from shaders.
- Complex transforms will lead to different path splitting which means
  that GPU arrays can no longer be cached if the transform has changed.
  Thus the current transform is added as a key to the cache.
- Add a public API to op for setting Affine transformations.

There are a number of optimizations that could be explored further but
which are left out now:
- Caching also of CPU operations (e.g path splitting & transforms) and
  not only caching the GPU arrays.
- Allow for re-use of cached GPU vertices if the transformation change
  is a pure offset / scaling since the splitting is then the same.

Signed-off-by: Viktor <viktor.ogeman@gmail.com>

2020-06-21 11:17:53 +02:00

..

clip

op/clip, gpu: split complex curves in package gpu instead

2020-06-21 11:17:27 +02:00

paint

op/paint: further clarify PaintOp documentation

2020-05-14 13:44:36 +02:00

op.go

gpu, op, internal/ops: add affine transformations

2020-06-21 11:17:53 +02:00