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(SkScalar radius, SkScalar dx, SkScalar dy, SkColor color, 39 uint32_t flags = kNone_BlurFlag); 40 virtual ~SkBlurDrawLooper(); 41 42 // overrides from SkDrawLooper 43 virtual void init(SkCanvas*); 44 virtual bool next(SkCanvas*, SkPaint* paint); 45 46 SK_DEVELOPER_TO_STRING() 47 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkBlurDrawLooper) 48 49 protected: 50 SkBlurDrawLooper(SkFlattenableReadBuffer&); 51 virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE; 52 53 private: 54 SkMaskFilter* fBlur; 55 SkColorFilter* fColorFilter; 56 SkScalar fDx, fDy; 57 SkColor fBlurColor; 58 uint32_t fBlurFlags; 59 60 enum State { 61 kBeforeEdge, 62 kAfterEdge, 63 kDone 64 }; 65 State fState; 66 67 typedef SkDrawLooper INHERITED; 68 }; 69 70 #endif 71
