Implement SkBlurDrawLooper with SkLayerDrawLooper

This allows us to delete SkBlurDrawLooper (and leave only one draw
looper implementation).

BUG=skia:

Change-Id: I549af86b81babf19e3649bdffffe2fdb0b308d5a
Reviewed-on: https://skia-review.googlesource.com/10101
Commit-Queue: Matt Sarett <msarett@google.com>
Reviewed-by: Derek Sollenberger <djsollen@google.com>

1 files changed, 6 insertions, 54 deletions

diff --git a/include/effects/SkBlurDrawLooper.h b/include/effects/SkBlurDrawLooper.h
index 415018a2ad..45289c8941 100644
--- a/include/effects/SkBlurDrawLooper.h
+++ b/include/effects/SkBlurDrawLooper.h
@@ -10,61 +10,13 @@
 #define SkBlurDrawLooper_DEFINED
 
 #include "SkDrawLooper.h"
-#include "SkColor.h"
 
-class SkArenaAlloc;
-class SkMaskFilter;
-class SkColorFilter;
-
-/** \class SkBlurDrawLooper
-    This class draws a shadow of the object (possibly offset), and then draws
-    the original object in its original position.
-    should there be an option to just draw the shadow/blur layer? webkit?
-*/
-class SK_API SkBlurDrawLooper : public SkDrawLooper {
-public:
-    static sk_sp<SkDrawLooper> Make(SkColor color, SkScalar sigma, SkScalar dx, SkScalar dy) {
-        return sk_sp<SkDrawLooper>(new SkBlurDrawLooper(color, sigma, dx, dy));
-    }
-
-    SkDrawLooper::Context* makeContext(SkCanvas*, SkArenaAlloc*) const override;
-
-    SK_TO_STRING_OVERRIDE()
-    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkBlurDrawLooper)
-
-protected:
-    SkBlurDrawLooper(SkColor color, SkScalar sigma, SkScalar dx, SkScalar dy);
-
-    void flatten(SkWriteBuffer&) const override;
-
-    bool asABlurShadow(BlurShadowRec*) const override;
-
-private:
-    sk_sp<SkMaskFilter>  fBlur;
-    SkScalar        fDx, fDy, fSigma;
-    SkColor         fBlurColor;
-
-    enum State {
-        kBeforeEdge,
-        kAfterEdge,
-        kDone
-    };
-
-    class BlurDrawLooperContext : public SkDrawLooper::Context {
-    public:
-        explicit BlurDrawLooperContext(const SkBlurDrawLooper* looper);
-
-        bool next(SkCanvas* canvas, SkPaint* paint) override;
-
-    private:
-        const SkBlurDrawLooper* fLooper;
-        State fState;
-    };
-
-    void init(SkScalar sigma, SkScalar dx, SkScalar dy, SkColor color);
-    void initEffects();
-
-    typedef SkDrawLooper INHERITED;
+/**
+ *  Draws a shadow of the object (possibly offset), and then draws the original object in
+ *  its original position.
+ */
+namespace SkBlurDrawLooper {
+    sk_sp<SkDrawLooper> Make(SkColor color, SkScalar sigma, SkScalar dx, SkScalar dy);
 };
 
 #endif