Reland "Use specialized quad lists in rectangle ops"
This is a reland of 5820b0c3f3ceba23b9d80415e77a9db124b409b8
It is updated in patchset 2 to clean up pointers passed into memcpy, and to
optimize the bounds calculation in GrPerspQuad. This should fix a performance
regression caused by the move away from caching 1/w. The Sk4f::invert() does not
always preserve 1/1 == 1, which led to bounds slightly outside of clips and
thus forced Skia to keep the scissor test enabled. The fix also restores the
optimization of skipping the 1/w division when the quad is known to be 2D.
Original change's description:
> Use specialized quad lists in rectangle ops
>
> Hopefully reduces memory footprint of GrFillRectOp and GrTextureOp
>
> The original rect code (GrAAFillRectOp) stored 2 SkMatrices (18 floats), 2
> SkRects (8 floats) an SkPMColor4f (4 floats) and a flag (1 int) for a total
> of 124 bytes per quad that was stored in the op.
>
> The first pass at the rectangle consolidation switched to storing device and
> local quads as GrPerspQuads (32 floats), an SkPMColor4f (4 floats) and a flag
> (1 int) for a total of 148 bytes per quad. After landing, several memory
> regressions appeared in Chrome and our perf monitor.
>
> Several intertwined approaches are taken here. First, GrPerspQuad no longer
> caches 1/w, which makes a quad 12 floats instead of 16. Second, a specialized
> list type is defined that allows storing the x, y, and extra metadata together
> for quads, but keeps the w components separate. When the quad type isn't
> perspective, w is not stored at all since it is implicitly 1 and can be
> reconstituted at tessellation time. This brings the total per quad to either
> 84 or 116 bytes, depending on if the op list needs perspective information.
>
> Bug: chromium:915025
> Bug: chromium:917242
> Change-Id: If37ee122847b0c32604bb45dc2a1326b544f9cf6
> Reviewed-on: https://skia-review.googlesource.com/c/180644
> Commit-Queue: Michael Ludwig <michaelludwig@google.com>
> Reviewed-by: Robert Phillips <robertphillips@google.com>
Bug: chromium:915025, chromium:917242
Change-Id: I98a1bf83fd7d393604823d567c57d7e06fad5e55
Reviewed-on: https://skia-review.googlesource.com/c/182203
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Chris Dalton <csmartdalton@google.com>
6 files changed
