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>
7 files changed