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 /*

  * Copyright 2010 The Android Open Source Project

  *

  * Use of this source code is governed by a BSD-style license that can be

  * found in the LICENSE file.

  */

 #ifndef SkLayer_DEFINED

 #define SkLayer_DEFINED

 #include "SkRefCnt.h"

 #include "SkTDArray.h"

 #include "SkColor.h"

 #include "SkMatrix.h"

 #include "SkPoint.h"

 #include "SkRect.h"

 #include "SkSize.h"

 class SkCanvas;

 class SkLayer : public SkRefCnt {

 public:

     SK_DECLARE_INST_COUNT(SkLayer)

     SkLayer();

     SkLayer(const SkLayer&);

     virtual ~SkLayer();

     bool isInheritFromRootTransform() const;

     SkScalar getOpacity() const { return m_opacity; }

     const SkSize& getSize() const { return m_size; }

     const SkPoint& getPosition() const { return m_position; }

     const SkPoint& getAnchorPoint() const { return m_anchorPoint; }

     const SkMatrix& getMatrix() const { return fMatrix; }

     const SkMatrix& getChildrenMatrix() const { return fChildrenMatrix; }

     SkScalar getWidth() const { return m_size.width(); }

     SkScalar getHeight() const { return m_size.height(); }

     void setInheritFromRootTransform(bool);

     void setOpacity(SkScalar opacity) { m_opacity = opacity; }

     void setSize(SkScalar w, SkScalar h) { m_size.set(w, h); }

     void setPosition(SkScalar x, SkScalar y) { m_position.set(x, y); }

     void setAnchorPoint(SkScalar x, SkScalar y) { m_anchorPoint.set(x, y); }

     void setMatrix(const SkMatrix&);

     void setChildrenMatrix(const SkMatrix&);

     // children

     /** Return the number of layers in our child list.

      */

     int countChildren() const;

     /** Return the child at the specified index (starting at 0). This does not

         affect the reference count of the child.

      */

     SkLayer* getChild(int index) const;

     /** Add this layer to our child list at the end (top-most), and ref() it.

         If it was already in another hierarchy, remove it from that list.

         Return the new child.

      */

     SkLayer* addChild(SkLayer* child);

     /** Remove this layer from its parent's list (or do nothing if it has no

         parent.) If it had a parent, then unref() is called.

      */

     void detachFromParent();

     /** Remove, and unref(), all of the layers in our child list.

      */

     void removeChildren();

     /** Return our parent layer, or NULL if we have none.

      */

     SkLayer* getParent() const { return fParent; }

     /** Return the root layer in this hiearchy. If this layer is the root

         (i.e. has no parent), then this returns itself.

      */

     SkLayer* getRootLayer() const;

     // coordinate system transformations

     /** Return, in matrix, the matix transfomations that are applied locally

         when this layer draws (i.e. its position and matrix/anchorPoint).

         This does not include the childrenMatrix, since that is only applied

         after this layer draws (but before its children draw).

      */

     void getLocalTransform(SkMatrix* matrix) const;

     /** Return, in matrix, the concatenation of transforms that are applied

         from this layer's root parent to the layer itself.

         This is the matrix that is applied to the layer during drawing.

      */

     void localToGlobal(SkMatrix* matrix) const;

     // paint method

     void draw(SkCanvas*, SkScalar opacity);

     void draw(SkCanvas* canvas) {

         this->draw(canvas, SK_Scalar1);

     }

 protected:

     virtual void onDraw(SkCanvas*, SkScalar opacity);

 private:

     enum Flags {

         kInheritFromRootTransform_Flag = 0x01

     };

     SkLayer*    fParent;

     SkScalar    m_opacity;

     SkSize      m_size;

     SkPoint     m_position;

     SkPoint     m_anchorPoint;

     SkMatrix    fMatrix;

     SkMatrix    fChildrenMatrix;

     uint32_t    fFlags;

     SkTDArray<SkLayer*> m_children;

     typedef SkRefCnt INHERITED;

 };

 #endif