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 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 #ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING 57 SkBlurDrawLooper(SkReadBuffer&); 58 #endif 59 virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE; 60 61 virtual bool asABlurShadow(BlurShadowRec*) const SK_OVERRIDE; 62 63 private: 64 SkMaskFilter* fBlur; 65 SkColorFilter* fColorFilter; 66 SkScalar fDx, fDy, fSigma; 67 SkColor fBlurColor; 68 uint32_t fBlurFlags; 69 70 enum State { 71 kBeforeEdge, 72 kAfterEdge, 73 kDone 74 }; 75 76 class BlurDrawLooperContext : public SkDrawLooper::Context { 77 public: 78 explicit BlurDrawLooperContext(const SkBlurDrawLooper* looper); 79 80 virtual bool next(SkCanvas* canvas, SkPaint* paint) SK_OVERRIDE; 81 82 private: 83 const SkBlurDrawLooper* fLooper; 84 State fState; 85 }; 86 87 void init(SkScalar sigma, SkScalar dx, SkScalar dy, SkColor color, uint32_t flags); 88 void initEffects(); 89 90 typedef SkDrawLooper INHERITED; 91 }; 92 93 #endif 94
