Revert "GrTessellator: hang fix."

This reverts commit 050c86768a2c24c62655f53ef9b685d40477eccb.

Reason for revert: layout test diff in Chrome roll?

Original change's description:
> GrTessellator: hang fix.
> 
> Some edges are not coincident with their own endpoints (because floating
> point). If this happens for an edge which is a right-enclosing-edge
> during the Bentley-Ottman simplify() pass, we end up an infinite loop
> attempting to split the edge, since the edge is never to the right of its
> endpoint.
> 
> The easiest fix is to simply remove the right-enclosing-edge splitting
> code. This code was originally added before we had proper
> active-edge-list rewinding, and should no longer be necessary.
> 
> BUG=802896
> 
> Change-Id: Id9f2942b73f01152af8c0088e8c6b1389891d827
> Reviewed-on: https://skia-review.googlesource.com/116920
> Reviewed-by: Robert Phillips <robertphillips@google.com>
> Commit-Queue: Stephen White <senorblanco@chromium.org>

TBR=robertphillips@google.com,senorblanco@chromium.org

Change-Id: Icb928db6c052a21c6d327da9492cb991f769186f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 802896
Reviewed-on: https://skia-review.googlesource.com/117120
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>

1 files changed, 0 insertions, 22 deletions

diff --git a/tests/TessellatingPathRendererTests.cpp b/tests/TessellatingPathRendererTests.cpp
index 035b3fe323..451391762d 100644
--- a/tests/TessellatingPathRendererTests.cpp
+++ b/tests/TessellatingPathRendererTests.cpp
@@ -439,27 +439,6 @@ static SkPath create_path_29() {
     return path;
 }
 
-// A path which hangs during simplification. It produces an edge which is
-// to the left of its own endpoints, which causes an infinte loop in the
-// right-enclosing-edge splitting.
-static SkPath create_path_30() {
-    SkPath path;
-    path.moveTo(0.75001740455627441406,     23.051967620849609375);
-    path.lineTo(5.8471612930297851562,      22.731662750244140625);
-    path.lineTo(10.749670028686523438,      22.253145217895507812);
-    path.lineTo(13.115868568420410156,      22.180681228637695312);
-    path.lineTo(15.418928146362304688,      22.340015411376953125);
-    path.lineTo(  17.654022216796875,       22.82159423828125);
-    path.lineTo(19.81632232666015625,       23.715869903564453125);
-    path.lineTo(40,                         0);
-    path.lineTo(5.5635203441547955577e-15,  0);
-    path.lineTo(5.5635203441547955577e-15,  47);
-    path.lineTo(-1.4210854715202003717e-14, 21.713298797607421875);
-    path.lineTo(0.75001740455627441406,     21.694292068481445312);
-    path.lineTo(0.75001740455627441406,     23.051967620849609375);
-    return path;
-}
-
 static std::unique_ptr<GrFragmentProcessor> create_linear_gradient_processor(GrContext* ctx) {
 
     SkPoint pts[2] = { {0, 0}, {1, 1} };
@@ -550,6 +529,5 @@ DEF_GPUTEST_FOR_ALL_CONTEXTS(TessellatingPathRendererTests, reporter, ctxInfo) {
     test_path(ctx, rtc.get(), create_path_27(), SkMatrix(), GrAAType::kCoverage);
     test_path(ctx, rtc.get(), create_path_28(), SkMatrix(), GrAAType::kCoverage);
     test_path(ctx, rtc.get(), create_path_29());
-    test_path(ctx, rtc.get(), create_path_30());
 }
 #endif