tree 91fec56dae447ceb15e1743117a8ff272c60a7c3
parent 29c14a760682e2c449fa043b5e8b69937cb58f3a
author Brian Salomon <bsalomon@google.com> 1513356069 -0500
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1513357568 +0000

Transform vertices for distance field glyphs on CPU.

This allows batching of DF draws with different view matrices.

For perspective matrices this means the transformed position vertex
attribute must have w values. Currently, non-perspective DF draws still
use 2 component positions, though this could be changed in the future.
Consequently, perspective draws can batch with other perspective draws
but not non-perspective draws.

Adds a GM to test batching and reusing the same blobs with both perspective
and non-perspective matrices.

Change-Id: I0e42c5449ebf3a5a54025dbcdec824d904d5bd9e
Reviewed-on: https://skia-review.googlesource.com/79900
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>