Alter Default & Software path renderers to better handle AA hairline paths

Alter Default & Software path renderers to better handle AA hairline paths

For some (as yet unknown reason) the guard in ConicPathBench that disables the path_hairline_big_AA_conic case isn't working. As an alternate fix, this CL makes the Default path renderer confess its lack of support for conics and allows the Software path renderer to handle non-AA cases. This will work but the real fix is to enable conics in the Default path renderer.

Here is the situation we're seeing in the path_hairline_big_AA_conic case:

the path is a hairline drawn with AA
the render target is multisampled (so AA on the draw gets disabled)

StencilAndCover path renderer doesn't handle hairlines
AAHairLine path renderer only handles AA paths (but can handle conics)
AAConvexPath renderer also only handles AA paths
Default path renderer only handles non-AA paths (but doesn't handle conics)
Software path renderer - was disallowed from handling non-AA paths

BUG=skia:2078
Committed: https://skia.googlesource.com/skia/+/730c0447916909f01df7fa12e9c82dd7cf7989dc

[robertphillips, 2014-07-24 17:18:59]

https://codereview.chromium.org/418073002/diff/1/src/gpu/GrSoftwarePathRender...
File src/gpu/GrSoftwarePathRenderer.cpp (left):

https://codereview.chromium.org/418073002/diff/1/src/gpu/GrSoftwarePathRender...
src/gpu/GrSoftwarePathRenderer.cpp:18: if (!antiAlias || NULL == fContext) {
Note that SW path rendering now only ever appears last so this change won't be
stealing work away from the default path renderer.

[bsalomon, 2014-07-24 17:57:21]

Do we setup the SkDraw to draw the path without aa?

[robertphillips, 2014-07-24 18:27:38]

We set AA appropriately on the SkPaint we construct to draw the raster path.

[bsalomon, 2014-07-24 18:57:15]

lgtm

[robertphillips, 2014-07-25 12:41:41]

The CQ bit was checked by robertphillips@google.com

[commit-bot: I haz the power, 2014-07-25 12:42:07]

CQ is trying da patch. Follow status at

https://skia-tree-status.appspot.com/cq/robertphillips@google.com/418073002/2...

[commit-bot: I haz the power, 2014-07-25 12:52:43]

Change committed as 730c0447916909f01df7fa12e9c82dd7cf7989dc