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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 {
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);
virtual void onDraw(SkCanvas*, SkScalar opacity);
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;