technique similar to the new MCAA.
This new technique simplifies the code significantly by unifying lines,
curves, and transformed curves. Blog posts forthcoming.
approximation of area based on approximate first-order line distance.
This enables support for full affine transforms in MCAA. It also greatly
simplifies the shader and reduces the amount of work that the GPU needs
to do for fragment shading.
Experimental testing has shown the area approximation to be accurate to
about 4%.
enable early Z for SVG.
Additionally, this switches the B-quad patches for XCAA to be convex
hulls instead of bounding boxes, reducing fragment shader load.
This is a large speedup for the Ghostscript tiger demo: 5x or more.
Closes#33.
Patrick Walton