Initialize writen paths and strokerecs lazily during GPU drawPath

src/gpu/SkGpuDevice.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGpuDevice.h"
 
 #include "effects/GrBicubicEffect.h"
@@ skipping 859 matching lines @@
 
     GrPaint grPaint;
     if (!skPaint2GrPaintShader(this, paint, true, &grPaint)) {
         return;
     }
 
     // If we have a prematrix, apply it to the path, optimizing for the case
     // where the original path can in fact be modified in place (even though
     // its parameter type is const).
     SkPath* pathPtr = const_cast<SkPath*>(&origSrcPath);
-    SkPath  tmpPath, effectPath;
+    SkTLazy<SkPath> tmpPath;
+    SkTLazy<SkPath> effectPath;
 
     if (prePathMatrix) {
         SkPath* result = pathPtr;
 
         if (!pathIsMutable) {
-            result = &tmpPath;
+            result = tmpPath.init();
             pathIsMutable = true;
         }
         // should I push prePathMatrix on our MV stack temporarily, instead
         // of applying it here? See SkDraw.cpp
         pathPtr->transform(*prePathMatrix, result);
         pathPtr = result;
     }
     // at this point we're done with prePathMatrix
     SkDEBUGCODE(prePathMatrix = (const SkMatrix*)0x50FF8001;)
 
     SkStrokeRec stroke(paint);
     SkPathEffect* pathEffect = paint.getPathEffect();
     const SkRect* cullRect = NULL;  // TODO: what is our bounds?
-    if (pathEffect && pathEffect->filterPath(&effectPath, *pathPtr, &stroke,
+    if (pathEffect && pathEffect->filterPath(effectPath.init(), *pathPtr, &stroke,
                                              cullRect)) {
-        pathPtr = &effectPath;
+        pathPtr = effectPath.get();
+        pathIsMutable = true;
     }
 
     if (paint.getMaskFilter()) {
         if (!stroke.isHairlineStyle()) {
-            if (stroke.applyToPath(&tmpPath, *pathPtr)) {
-                pathPtr = &tmpPath;
+            SkPath* strokedPath = pathIsMutable ? pathPtr : tmpPath.init();
+            if (stroke.applyToPath(strokedPath, *pathPtr)) {
+                pathPtr = strokedPath;
                 pathIsMutable = true;
                 stroke.setFillStyle();
             }
         }
 
         // avoid possibly allocating a new path in transform if we can
-        SkPath* devPathPtr = pathIsMutable ? pathPtr : &tmpPath;
+        SkPath* devPathPtr = pathIsMutable ? pathPtr : tmpPath.init();
 
         // transform the path into device space
         pathPtr->transform(fContext->getMatrix(), devPathPtr);
 
         SkRect maskRect;
         if (paint.getMaskFilter()->canFilterMaskGPU(devPathPtr->getBounds(),
                                                     draw.fClip->getBounds(),
                                                     fContext->getMatrix(),
                                                     &maskRect)) {
             // The context's matrix may change while creating the mask, so save the CTM here to
@@ skipping 1033 matching lines @@
                          GrTexture* texture,
                          bool needClear)
     : SkBitmapDevice(make_bitmap(context, texture->asRenderTarget())) {
 
     SkASSERT(texture && texture->asRenderTarget());
     // This constructor is called from onCreateCompatibleDevice. It has locked the RT in the texture
     // cache. We pass true for the third argument so that it will get unlocked.
     this->initFromRenderTarget(context, texture->asRenderTarget(), true);
     fNeedClear = needClear;
 }