Make stencil and cover path rendering have more reasonable bounds.

src/gpu/batches/GrDrawPathBatch.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDrawPathBatch.h"
 
 SkString GrDrawPathBatch::dumpInfo() const {
@@ skipping 38 matching lines @@
         // Double check that it is in fact winding.
         SkASSERT(kIncClamp_StencilOp == this->stencilSettings().passOp(pathFace));
         SkASSERT(kIncClamp_StencilOp == this->stencilSettings().failOp(pathFace));
         SkASSERT(0x1 != this->stencilSettings().writeMask(pathFace));
         SkASSERT(!this->stencilSettings().isTwoSided());
     }
     return isWinding;
 }
 
 GrDrawPathRangeBatch::GrDrawPathRangeBatch(const SkMatrix& viewMatrix, const SkMatrix& localMatrix,
-                                           GrColor color, GrPathRange* range, GrPathRangeDraw* draw)
+                                           GrColor color, GrPathRange* range, GrPathRangeDraw* draw,
+                                           const SkRect& bounds)
     : INHERITED(ClassID(), viewMatrix, color)
     , fPathRange(range)
     , fLocalMatrix(localMatrix) {
     SkDEBUGCODE(draw->fUsedInBatch = true;)
     fDraws.addToHead(SkRef(draw));
     fTotalPathCount = draw->count();
-    // Don't compute a bounding box. For dst copy texture, we'll opt instead for it to just copy
-    // the entire dst. Realistically this is a moot point, because any context that supports
-    // NV_path_rendering will also support NV_blend_equation_advanced.
-    // For clipping we'll just skip any optimizations based on the bounds.
-    fBounds.setLargest();
+    fBounds = bounds;
 }
 
 bool GrDrawPathRangeBatch::onCombineIfPossible(GrBatch* t, const GrCaps& caps) {
     GrDrawPathRangeBatch* that = t->cast<GrDrawPathRangeBatch>();
     if (this->fPathRange.get() != that->fPathRange.get()) {
         return false;
     }
     if (!GrPathRangeDraw::CanMerge(**this->fDraws.head(), **that->fDraws.head())) {
         return false;
     }
@@ skipping 56 matching lines @@
         memcpy(indices, (*iter.get())->indices(), cnt * sizeof(uint16_t));
         indices += cnt;
         memcpy(transforms, (*iter.get())->transforms(), cnt * floatsPerTransform * sizeof(float));
         transforms += cnt * floatsPerTransform;
     }
     SkASSERT(indices - indexStorage.get() == fTotalPathCount);
     state->gpu()->pathRendering()->drawPaths(args, fPathRange.get(), indexStorage.get(),
         GrPathRange::kU16_PathIndexType, transformStorage.get(), transformType,
         fTotalPathCount);
 }