tree b7037a5615e90e6e3f8dabe9e1dcb77e0225d55b
parent 92c500b1119659ce6142ee79f676d80e99c69d05
author Michael Ludwig <michaelludwig@google.com> 1537389967 -0400
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1537392005 +0000

Increase precision for two point gradient coordinates.

This can be seen in these failing gold images:
https://gold.skia.org/detail?test=gradients_local_perspective_nodither&digest=52ef69138d81fcb58f4439b2d5903f45

Zooming in on the 2nd from the bottom, rightmost gradient shows a
solid red line in the blue border region (due to overflow and then
being clamped to the wrong border). The 2nd rightmost gradient in
the same row also shows extra red at the bottom from similar overflow.

The former error appears now because the GPU pipeline didn't previously
render that gradient at all. The latter appears now because the refactor
for gradients changed where clamping of texture coordinates occurred.

Bug: skia:
Change-Id: If2a886eaae4e8817a205d9bb77cf092b97d27c84
Reviewed-on: https://skia-review.googlesource.com/155610
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Michael Ludwig <michaelludwig@google.com>