Restrict query bounds for reduce clip to dev bounds

src/gpu/GrClipMaskManager.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrClipMaskManager.h"
 #include "GrCaps.h"
 #include "GrDrawingManager.h"
@@ skipping 299 matching lines @@
             SkIRect scissor = clip.irect();
             if (scissor.intersect(clipSpaceRTIBounds)) {
                 out->fScissorState.set(scissor);
                 this->setPipelineBuilderStencil(pipelineBuilder, ars);
                 return true;
             }
             return false;
         }
         case GrClip::kClipStack_ClipType: {
             clipSpaceRTIBounds.offset(clip.origin());
+            SkIRect clipSpaceReduceQueryBounds;
+            if (devBounds) {
+                SkIRect devIBounds = devBounds->roundOut();
+                devIBounds.offset(clip.origin());
+                if (!clipSpaceReduceQueryBounds.intersect(clipSpaceRTIBounds, devIBounds)) {
+                    return false;
+                }
+            } else {
+                clipSpaceReduceQueryBounds = clipSpaceRTIBounds;
+            }
             GrReducedClip::ReduceClipStack(*clip.clipStack(),
-                                            clipSpaceRTIBounds,
+                                            clipSpaceReduceQueryBounds,
                                             &elements,
                                             &genID,
                                             &initialState,
                                             &clipSpaceIBounds,
                                             &requiresAA);
             if (elements.isEmpty()) {
                 if (GrReducedClip::kAllIn_InitialState == initialState) {
                     if (clipSpaceIBounds == clipSpaceRTIBounds) {
                         this->setPipelineBuilderStencil(pipelineBuilder, ars);
                         return true;
@@ skipping 764 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 
 void GrClipMaskManager::adjustPathStencilParams(const GrStencilAttachment* stencilAttachment,
                                                 GrStencilSettings* settings) {
     if (stencilAttachment) {
         int stencilBits = stencilAttachment->bits();
         this->adjustStencilParams(settings, fClipMode, stencilBits);
     }
 }