Add ability to ninepatch blurred rounded rectangle

Speed up drawing large blurry round rectangles by converting them to
nine patches.

SkDraw:
Add drawRRect.

SkBitmapDevice:
Call SkDraw::drawRRect instead of converting SkRRect to an SkPath.

SkMaskFilter/SkBlurMaskFilter:
Create a nine patch of a blurred round rect and draw it instead of
drawing the entire thing.

SkPDFDevice:
Override drawRRect to perform the old behavior in
SkBitmapDevice::drawRect.

Depends on https://codereview.chromium.org/52703003

Tests are in https://codereview.chromium.org/52793005

BUG=https://b.corp.google.com/issue?id=11174385
R=reed@google.com, robertphillips@google.com

Review URL: https://codereview.chromium.org/48623006

git-svn-id: http://skia.googlecode.com/svn/trunk@12198 2bbb7eff-a529-9590-31e7-b0007b416f81

3 files changed, 20 insertions, 0 deletions

diff --git a/include/core/SkDraw.h b/include/core/SkDraw.h
index 9183094679..f7ae1c6208 100644
--- a/include/core/SkDraw.h
+++ b/include/core/SkDraw.h
@@ -24,6 +24,7 @@ class SkRegion;
 class SkRasterClip;
 struct SkDrawProcs;
 struct SkRect;
+class SkRRect;
 
 class SkDraw {
 public:
@@ -34,6 +35,7 @@ public:
     void    drawPoints(SkCanvas::PointMode, size_t count, const SkPoint[],
                        const SkPaint&, bool forceUseDevice = false) const;
     void    drawRect(const SkRect&, const SkPaint&) const;
+    void    drawRRect(const SkRRect&, const SkPaint&) const;
     /**
      *  To save on mallocs, we allow a flag that tells us that srcPath is
      *  mutable, so that we don't have to make copies of it as we transform it.
diff --git a/include/core/SkMaskFilter.h b/include/core/SkMaskFilter.h
index 93e2d4bc33..f4448ddddb 100644
--- a/include/core/SkMaskFilter.h
+++ b/include/core/SkMaskFilter.h
@@ -21,6 +21,7 @@ class SkBounder;
 class SkMatrix;
 class SkPath;
 class SkRasterClip;
+class SkRRect;
 
 /** \class SkMaskFilter
 
@@ -162,6 +163,12 @@ protected:
                                            const SkMatrix&,
                                            const SkIRect& clipBounds,
                                            NinePatch*) const;
+    /**
+     *  Similar to filterRectsToNine, except it performs the work on a round rect.
+     */
+    virtual FilterReturn filterRRectToNine(const SkRRect&, const SkMatrix&,
+                                           const SkIRect& clipBounds,
+                                           NinePatch*) const;
 
 private:
     friend class SkDraw;
@@ -175,6 +182,14 @@ private:
                     const SkRasterClip&, SkBounder*, SkBlitter* blitter,
                     SkPaint::Style style) const;
 
+    /** Helper method that, given a roundRect in device space, will rasterize it into a kA8_Format
+     mask and then call filterMask(). If this returns true, the specified blitter will be called
+     to render that mask. Returns false if filterMask() returned false.
+     */
+    bool filterRRect(const SkRRect& devRRect, const SkMatrix& devMatrix,
+                     const SkRasterClip&, SkBounder*, SkBlitter* blitter,
+                     SkPaint::Style style) const;
+
     typedef SkFlattenable INHERITED;
 };
 
diff --git a/include/pdf/SkPDFDevice.h b/include/pdf/SkPDFDevice.h
index d8e1aa283f..8e1f41823f 100644
--- a/include/pdf/SkPDFDevice.h
+++ b/include/pdf/SkPDFDevice.h
@@ -33,6 +33,7 @@ class SkPDFObject;
 class SkPDFResourceDict;
 class SkPDFShader;
 class SkPDFStream;
+class SkRRect;
 template <typename T> class SkTSet;
 
 // Private classes.
@@ -83,6 +84,8 @@ public:
                             size_t count, const SkPoint[],
                             const SkPaint& paint) SK_OVERRIDE;
     virtual void drawRect(const SkDraw&, const SkRect& r, const SkPaint& paint);
+    virtual void drawRRect(const SkDraw&, const SkRRect& rr,
+                           const SkPaint& paint) SK_OVERRIDE;
     virtual void drawPath(const SkDraw&, const SkPath& origpath,
                           const SkPaint& paint, const SkMatrix* prePathMatrix,
                           bool pathIsMutable) SK_OVERRIDE;