1 2 /* 3 * Copyright 2008 The Android Open Source Project 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8 9 10 #ifndef SkBlurDrawLooper_DEFINED 11 #define SkBlurDrawLooper_DEFINED 12 13 #include "SkDrawLooper.h" 14 #include "SkColor.h" 15 16 class SkMaskFilter; 17 class SkColorFilter; 18 19 /** \class SkBlurDrawLooper 20 This class draws a shadow of the object (possibly offset), and then draws 21 the original object in its original position. 22 should there be an option to just draw the shadow/blur layer? webkit? 23 */ 24 class SK_API SkBlurDrawLooper : public SkDrawLooper { 25 public: 26 enum BlurFlags { 27 kNone_BlurFlag = 0x00, 28 /** 29 The blur layer's dx/dy/radius aren't affected by the canvas 30 transform. 31 */ 32 kIgnoreTransform_BlurFlag = 0x01, 33 kOverrideColor_BlurFlag = 0x02, 34 kHighQuality_BlurFlag = 0x04, 35 /** mask for all blur flags */ 36 kAll_BlurFlag = 0x07 37 }; 38 39 SkBlurDrawLooper(SkScalar radius, SkScalar dx, SkScalar dy, SkColor color, 40 uint32_t flags = kNone_BlurFlag); 41 virtual ~SkBlurDrawLooper(); 42 43 // overrides from SkDrawLooper 44 virtual void init(SkCanvas*); 45 virtual bool next(SkCanvas*, SkPaint* paint); 46 CreateProc(SkFlattenableReadBuffer & buffer)47 static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { 48 return SkNEW_ARGS(SkBlurDrawLooper, (buffer)); 49 } 50 51 SK_DECLARE_FLATTENABLE_REGISTRAR() 52 53 protected: 54 SkBlurDrawLooper(SkFlattenableReadBuffer&); 55 // overrides from SkFlattenable 56 virtual void flatten(SkFlattenableWriteBuffer& ); getFactory()57 virtual Factory getFactory() { return CreateProc; } 58 59 private: 60 SkMaskFilter* fBlur; 61 SkColorFilter* fColorFilter; 62 SkScalar fDx, fDy; 63 SkColor fBlurColor; 64 uint32_t fBlurFlags; 65 66 enum State { 67 kBeforeEdge, 68 kAfterEdge, 69 kDone 70 }; 71 State fState; 72 73 typedef SkDrawLooper INHERITED; 74 }; 75 76 #endif 77