1 2 /* 3 * Copyright 2010 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 SkLayer_DEFINED 11 #define SkLayer_DEFINED 12 13 #include "SkRefCnt.h" 14 #include "SkTDArray.h" 15 #include "SkColor.h" 16 #include "SkMatrix.h" 17 #include "SkPoint.h" 18 #include "SkRect.h" 19 #include "SkSize.h" 20 21 class SkCanvas; 22 23 class SkLayer : public SkRefCnt { 24 25 public: 26 SK_DECLARE_INST_COUNT(SkLayer) 27 28 SkLayer(); 29 SkLayer(const SkLayer&); 30 virtual ~SkLayer(); 31 32 bool isInheritFromRootTransform() const; getOpacity()33 SkScalar getOpacity() const { return m_opacity; } getSize()34 const SkSize& getSize() const { return m_size; } getPosition()35 const SkPoint& getPosition() const { return m_position; } getAnchorPoint()36 const SkPoint& getAnchorPoint() const { return m_anchorPoint; } getMatrix()37 const SkMatrix& getMatrix() const { return fMatrix; } getChildrenMatrix()38 const SkMatrix& getChildrenMatrix() const { return fChildrenMatrix; } 39 getWidth()40 SkScalar getWidth() const { return m_size.width(); } getHeight()41 SkScalar getHeight() const { return m_size.height(); } 42 43 void setInheritFromRootTransform(bool); setOpacity(SkScalar opacity)44 void setOpacity(SkScalar opacity) { m_opacity = opacity; } setSize(SkScalar w,SkScalar h)45 void setSize(SkScalar w, SkScalar h) { m_size.set(w, h); } setPosition(SkScalar x,SkScalar y)46 void setPosition(SkScalar x, SkScalar y) { m_position.set(x, y); } setAnchorPoint(SkScalar x,SkScalar y)47 void setAnchorPoint(SkScalar x, SkScalar y) { m_anchorPoint.set(x, y); } 48 void setMatrix(const SkMatrix&); 49 void setChildrenMatrix(const SkMatrix&); 50 51 // children 52 53 /** Return the number of layers in our child list. 54 */ 55 int countChildren() const; 56 57 /** Return the child at the specified index (starting at 0). This does not 58 affect the reference count of the child. 59 */ 60 SkLayer* getChild(int index) const; 61 62 /** Add this layer to our child list at the end (top-most), and ref() it. 63 If it was already in another hierarchy, remove it from that list. 64 Return the new child. 65 */ 66 SkLayer* addChild(SkLayer* child); 67 68 /** Remove this layer from its parent's list (or do nothing if it has no 69 parent.) If it had a parent, then unref() is called. 70 */ 71 void detachFromParent(); 72 73 /** Remove, and unref(), all of the layers in our child list. 74 */ 75 void removeChildren(); 76 77 /** Return our parent layer, or NULL if we have none. 78 */ getParent()79 SkLayer* getParent() const { return fParent; } 80 81 /** Return the root layer in this hiearchy. If this layer is the root 82 (i.e. has no parent), then this returns itself. 83 */ 84 SkLayer* getRootLayer() const; 85 86 // coordinate system transformations 87 88 /** Return, in matrix, the matix transfomations that are applied locally 89 when this layer draws (i.e. its position and matrix/anchorPoint). 90 This does not include the childrenMatrix, since that is only applied 91 after this layer draws (but before its children draw). 92 */ 93 void getLocalTransform(SkMatrix* matrix) const; 94 95 /** Return, in matrix, the concatenation of transforms that are applied 96 from this layer's root parent to the layer itself. 97 This is the matrix that is applied to the layer during drawing. 98 */ 99 void localToGlobal(SkMatrix* matrix) const; 100 101 // paint method 102 103 void draw(SkCanvas*, SkScalar opacity); draw(SkCanvas * canvas)104 void draw(SkCanvas* canvas) { 105 this->draw(canvas, SK_Scalar1); 106 } 107 108 protected: 109 virtual void onDraw(SkCanvas*, SkScalar opacity); 110 111 private: 112 enum Flags { 113 kInheritFromRootTransform_Flag = 0x01 114 }; 115 116 SkLayer* fParent; 117 SkScalar m_opacity; 118 SkSize m_size; 119 SkPoint m_position; 120 SkPoint m_anchorPoint; 121 SkMatrix fMatrix; 122 SkMatrix fChildrenMatrix; 123 uint32_t fFlags; 124 125 SkTDArray<SkLayer*> m_children; 126 127 typedef SkRefCnt INHERITED; 128 }; 129 130 #endif 131