Add flag to avoid stencil buffers in Skia

Certain systems experience a leak in the GL driver associated with
stencil buffers. Attempts to avoid the leak (while still using stencil
buffers) dind't succeed. This patch adds a GrContextOption
fAvoidStencilBuffers. This disables certain path rendering modes, as
well as stencil based masking/clipping.

Bug: 713854
Change-Id: Ifa6c0f2bd5ee395547bda9165d6c79d197ae8b8b
Reviewed-on: https://skia-review.googlesource.com/15253
Commit-Queue: Eric Karl <ericrk@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Reviewed-by: Brian Salomon <bsalomon@google.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/tests/GLProgramsTest.cpp b/tests/GLProgramsTest.cpp
index 6e9bef9fc8..3cf28daad2 100644
--- a/tests/GLProgramsTest.cpp
+++ b/tests/GLProgramsTest.cpp
@@ -251,7 +251,11 @@ static bool set_random_state(GrPaint* paint, SkRandom* random) {
 }
 
 // right now, the only thing we seem to care about in drawState's stencil is 'doesWrite()'
-static const GrUserStencilSettings* get_random_stencil(SkRandom* random) {
+static const GrUserStencilSettings* get_random_stencil(SkRandom* random, GrContext* context) {
+    if (context->caps()->avoidStencilBuffers()) {
+        return &GrUserStencilSettings::kUnused;
+    }
+
     static constexpr GrUserStencilSettings kDoesWriteStencil(
         GrUserStencilSettings::StaticInit<
             0xffff,
@@ -332,7 +336,7 @@ bool GrDrawingManager::ProgramUnitTest(GrContext* context, int maxStages) {
         set_random_color_coverage_stages(&grPaint, &ptd, maxStages);
         set_random_xpf(&grPaint, &ptd);
         bool snapToCenters = set_random_state(&grPaint, &random);
-        const GrUserStencilSettings* uss = get_random_stencil(&random);
+        const GrUserStencilSettings* uss = get_random_stencil(&random, context);
         // We don't use kHW because we will hit an assertion if the render target is not
         // multisampled
         static constexpr GrAAType kAATypes[] = {GrAAType::kNone, GrAAType::kCoverage};