[graphite] Hook up software path renderer.
Added code to use software path renderer when Vello is not available and the multisample count is 1. This path is disabled for the moment due
to Dawn issues. Also fixes some bugs in the SoftwarePathAtlas.
Bug: b/291735945
Change-Id: I2c01c17becd52f09fcefbf390f9b84815c0c1c96
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/752359
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Michael Ludwig <michaelludwig@google.com>
7 files changed
