tree e59e9a98ee1f7422ecf641cc998a977f28151a70
parent 75a1377e54fb44c84a2712d9c678b1b448a9cffe
author Brian Salomon <bsalomon@google.com> 1510003562 -0500
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1510019796 +0000

Make GrAtlasTextBlob return to caller when a flush is required during subrun tessellation.

The old code used a helper object in the tessellation code that called flush() on GrAtlasTextOp.
A confusing aspect of this was that the pre-flush vertex data generated for the sub run was copied
to the op's vertex buffer after flush() had already recorded the draw that read the data.

The new code adds a tessellator nested helper class to GrAtlasTextBlob. The helper exits early if
a flush is required, the op performs the flush, and then the helper is invoked again until
tessellation is complete.

This also changes the blob object to use char* instead of unsigned char* for its vertex pointers.

Change-Id: I31bed251435f13b2172e6f5829ba437b882dd44d
Reviewed-on: https://skia-review.googlesource.com/67856
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>