michael@0: /*
michael@0:  * Copyright 2008 The Android Open Source Project
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: 
michael@0: #ifndef SkBlurDrawLooper_DEFINED
michael@0: #define SkBlurDrawLooper_DEFINED
michael@0: 
michael@0: #include "SkDrawLooper.h"
michael@0: #include "SkColor.h"
michael@0: 
michael@0: class SkMaskFilter;
michael@0: class SkColorFilter;
michael@0: 
michael@0: /** \class SkBlurDrawLooper
michael@0:     This class draws a shadow of the object (possibly offset), and then draws
michael@0:     the original object in its original position.
michael@0:     should there be an option to just draw the shadow/blur layer? webkit?
michael@0: */
michael@0: class SK_API SkBlurDrawLooper : public SkDrawLooper {
michael@0: public:
michael@0:     enum BlurFlags {
michael@0:         kNone_BlurFlag = 0x00,
michael@0:         /**
michael@0:             The blur layer's dx/dy/radius aren't affected by the canvas
michael@0:             transform.
michael@0:         */
michael@0:         kIgnoreTransform_BlurFlag   = 0x01,
michael@0:         kOverrideColor_BlurFlag     = 0x02,
michael@0:         kHighQuality_BlurFlag       = 0x04,
michael@0:         /** mask for all blur flags */
michael@0:         kAll_BlurFlag               = 0x07
michael@0:     };
michael@0: 
michael@0:     SkBlurDrawLooper(SkColor color, SkScalar sigma, SkScalar dx, SkScalar dy,
michael@0:                      uint32_t flags = kNone_BlurFlag);
michael@0: 
michael@0: //    SK_ATTR_DEPRECATED("use sigma version")
michael@0:     SkBlurDrawLooper(SkScalar radius, SkScalar dx, SkScalar dy, SkColor color,
michael@0:                      uint32_t flags = kNone_BlurFlag);
michael@0:     virtual ~SkBlurDrawLooper();
michael@0: 
michael@0:     virtual SkDrawLooper::Context* createContext(SkCanvas*, void* storage) const SK_OVERRIDE;
michael@0: 
michael@0:     virtual size_t contextSize() const SK_OVERRIDE { return sizeof(BlurDrawLooperContext); }
michael@0: 
michael@0:     SK_TO_STRING_OVERRIDE()
michael@0:     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkBlurDrawLooper)
michael@0: 
michael@0: protected:
michael@0:     SkBlurDrawLooper(SkReadBuffer&);
michael@0:     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
michael@0: 
michael@0: private:
michael@0:     SkMaskFilter*   fBlur;
michael@0:     SkColorFilter*  fColorFilter;
michael@0:     SkScalar        fDx, fDy;
michael@0:     SkColor         fBlurColor;
michael@0:     uint32_t        fBlurFlags;
michael@0: 
michael@0:     enum State {
michael@0:         kBeforeEdge,
michael@0:         kAfterEdge,
michael@0:         kDone
michael@0:     };
michael@0: 
michael@0:     class BlurDrawLooperContext : public SkDrawLooper::Context {
michael@0:     public:
michael@0:         explicit BlurDrawLooperContext(const SkBlurDrawLooper* looper);
michael@0: 
michael@0:         virtual bool next(SkCanvas* canvas, SkPaint* paint) SK_OVERRIDE;
michael@0: 
michael@0:     private:
michael@0:         const SkBlurDrawLooper* fLooper;
michael@0:         State fState;
michael@0:     };
michael@0: 
michael@0:     void init(SkScalar sigma, SkScalar dx, SkScalar dy, SkColor color, uint32_t flags);
michael@0: 
michael@0:     typedef SkDrawLooper INHERITED;
michael@0: };
michael@0: 
michael@0: #endif