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