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 static SkBlurDrawLooper* Create(SkColor color, SkScalar sigma, SkScalar dx, SkScalar dy, 39 uint32_t flags = kNone_BlurFlag) { 40 return SkNEW_ARGS(SkBlurDrawLooper, (color, sigma, dx, dy, flags)); 41 } 42 43 virtual ~SkBlurDrawLooper(); 44 45 virtual SkDrawLooper::Context* createContext(SkCanvas*, void* storage) const SK_OVERRIDE; 46 contextSize()47 virtual size_t contextSize() const SK_OVERRIDE { return sizeof(BlurDrawLooperContext); } 48 49 SK_TO_STRING_OVERRIDE() 50 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkBlurDrawLooper) 51 52 protected: 53 SkBlurDrawLooper(SkColor color, SkScalar sigma, SkScalar dx, SkScalar dy, 54 uint32_t flags); 55 56 SkBlurDrawLooper(SkReadBuffer&); 57 virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE; 58 59 virtual bool asABlurShadow(BlurShadowRec*) const SK_OVERRIDE; 60 61 private: 62 SkMaskFilter* fBlur; 63 SkColorFilter* fColorFilter; 64 SkScalar fDx, fDy, fSigma; 65 SkColor fBlurColor; 66 uint32_t fBlurFlags; 67 68 enum State { 69 kBeforeEdge, 70 kAfterEdge, 71 kDone 72 }; 73 74 class BlurDrawLooperContext : public SkDrawLooper::Context { 75 public: 76 explicit BlurDrawLooperContext(const SkBlurDrawLooper* looper); 77 78 virtual bool next(SkCanvas* canvas, SkPaint* paint) SK_OVERRIDE; 79 80 private: 81 const SkBlurDrawLooper* fLooper; 82 State fState; 83 }; 84 85 void init(SkScalar sigma, SkScalar dx, SkScalar dy, SkColor color, uint32_t flags); 86 void initEffects(); 87 88 typedef SkDrawLooper INHERITED; 89 }; 90 91 #endif 92