Clip scissor to RT bounds

R=joshualitt@google.com

NOTREECHECKS=true

Review URL: https://codereview.chromium.org/985783002

1 files changed, 9 insertions, 4 deletions

diff --git a/src/gpu/GrClipMaskManager.cpp b/src/gpu/GrClipMaskManager.cpp
index b58c56566e..66d817ec00 100644
--- a/src/gpu/GrClipMaskManager.cpp
+++ b/src/gpu/GrClipMaskManager.cpp
@@ -240,10 +240,15 @@ bool GrClipMaskManager::setupClipping(GrPipelineBuilder* pipelineBuilder,
         case GrClip::kWideOpen_ClipType:
             SkFAIL("Should have caught this with clip.isWideOpen()");
             return true;
-        case GrClip::kIRect_ClipType:
-            scissorState->set(clip.irect());
-            this->setPipelineBuilderStencil(pipelineBuilder, ars);
-            return true;
+        case GrClip::kIRect_ClipType: {
+            SkIRect scissor = clip.irect();
+            if (scissor.intersect(clipSpaceRTIBounds)) {
+                scissorState->set(scissor);
+                this->setPipelineBuilderStencil(pipelineBuilder, ars);
+                return true;
+            }
+            return false;
+        }
         case GrClip::kClipStack_ClipType: {
             clipSpaceRTIBounds.offset(clip.origin());
             GrReducedClip::ReduceClipStack(*clip.clipStack(),