tree c4910d7d5157573b6a71a497a4dd5a9d230900cf
parent a9026da4258d24bec46d2c2693a7024ebf718821
author Chris Dalton <csmartdalton@google.com> 1591310669 -0600
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1591371199 +0000

Handle tessellated paths that require more segments than are supported

Adds a method to determine the worst-case number of tessellated line
segments that a path might require, and disables hardware tessellation
if it is more segments than are supported (falling back on indirect
draw shaders).

If the path requires even more segments than are supported by the
indirect draw shaders (1024), we crop the path to the viewport. The
required number of segments is proportional to the square root of the
bounding box's diagonal, so we won't start cropping paths until their
device-space bounding box diagonal is nearly 175,000 pixels long.

Change-Id: I8a9435e70bb93dda3464cc11a3e44fbe511744ae
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/293691
Reviewed-by: Greg Daniel <egdaniel@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>