Reland of Implement canComputeFastBounds() for image filters.

include/core/SkPaint.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPaint_DEFINED
 #define SkPaint_DEFINED
 
 #include "SkColor.h"
-#include "SkDrawLooper.h"
 #include "SkFilterQuality.h"
 #include "SkMatrix.h"
 #include "SkXfermode.h"
 
 class SkAnnotation;
 class SkAutoDescriptor;
 class SkAutoGlyphCache;
 class SkColorFilter;
 class SkData;
 class SkDescriptor;
+class SkDrawLooper;
 class SkReadBuffer;
 class SkWriteBuffer;
 class SkGlyph;
 struct SkRect;
 class SkGlyphCache;
 class SkImageFilter;
 class SkMaskFilter;
 class SkPath;
 class SkPathEffect;
 struct SkPoint;
@@ skipping 869 matching lines @@
     // mean that we need not draw at all (e.g. SrcOver + 0-alpha)
     bool nothingToDraw() const;
 
     ///////////////////////////////////////////////////////////////////////////
     // would prefer to make these private...
 
     /** Returns true if the current paint settings allow for fast computation of
      bounds (i.e. there is nothing complex like a patheffect that would make
      the bounds computation expensive.
      */
-    bool canComputeFastBounds() const {
-        if (this->getLooper()) {
-            return this->getLooper()->canComputeFastBounds(*this);
-        }
-        return !this->getRasterizer();
-    }
+    bool canComputeFastBounds() const;
 
     /** Only call this if canComputeFastBounds() returned true. This takes a
      raw rectangle (the raw bounds of a shape), and adjusts it for stylistic
      effects in the paint (e.g. stroking). If needed, it uses the storage
      rect parameter. It returns the adjusted bounds that can then be used
      for quickReject tests.
 
      The returned rect will either be orig or storage, thus the caller
      should not rely on storage being set to the result, but should always
      use the retured value. It is legal for orig and storage to be the same
@@ skipping 166 matching lines @@
     friend class GrStencilAndCoverTextContext;
     friend class GrPathRendering;
     friend class GrTextContext;
     friend class GrGLPathRendering;
     friend class SkScalerContext;
     friend class SkTextToPathIter;
     friend class SkCanonicalizePaint;
 };
 
 #endif