Round stencil buffers dims up to next pow2 when allowed

src/gpu/GrGpu.cpp

 
 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGpu.h"
@@ skipping 69 matching lines @@
         if (srcData) {
             fStats.incTextureUploads();
         }
     }
     return tex;
 }
 
 bool GrGpu::attachStencilBufferToRenderTarget(GrRenderTarget* rt) {
     SkASSERT(NULL == rt->getStencilBuffer());
     GrUniqueKey sbKey;
-    GrStencilBuffer::ComputeSharedStencilBufferKey(rt->width(), rt->height(), rt->numSamples(),
-                                                   &sbKey);
+
+    int width = rt->width();
+    int height = rt->height();
+    if (this->caps()->oversizedStencilSupport()) {
+        width  = SkNextPow2(width);
+        height = SkNextPow2(height);
+    }
+
+    GrStencilBuffer::ComputeSharedStencilBufferKey(width, height, rt->numSamples(), &sbKey);
     SkAutoTUnref<GrStencilBuffer> sb(static_cast<GrStencilBuffer*>(
         this->getContext()->getResourceCache()->findAndRefUniqueResource(sbKey)));
     if (sb) {
         rt->setStencilBuffer(sb);
         bool attached = this->attachStencilBufferToRenderTarget(sb, rt);
         if (!attached) {
             rt->setStencilBuffer(NULL);
         }
         return attached;
     }
-    if (this->createStencilBufferForRenderTarget(rt, rt->width(), rt->height())) {
+    if (this->createStencilBufferForRenderTarget(rt, width, height)) {
         // Right now we're clearing the stencil buffer here after it is
         // attached to an RT for the first time. When we start matching
         // stencil buffers with smaller color targets this will no longer
         // be correct because it won't be guaranteed to clear the entire
         // sb.
         // We used to clear down in the GL subclass using a special purpose
         // FBO. But iOS doesn't allow a stencil-only FBO. It reports unsupported
         // FBO status.
         this->clearStencil(rt);
         rt->getStencilBuffer()->resourcePriv().setUniqueKey(sbKey);
@@ skipping 201 matching lines @@
                       GrDrawTarget::PathIndexType indexType,
                       const float transformValues[],
                       GrDrawTarget::PathTransformType transformType,
                       int count,
                       const GrStencilSettings& stencilSettings) {
     this->handleDirtyContext();
     pathRange->willDrawPaths(indices, indexType, count);
     this->onDrawPaths(args, pathRange, indices, indexType, transformValues,
                       transformType, count, stencilSettings);
 }