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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef Layer_DEFINED
#define Layer_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 Layer : public SkRefCnt {
public:
Layer();
Layer(const Layer&);
virtual ~Layer();
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.
*/
Layer* 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.
*/
Layer* addChild(Layer* 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.
*/
Layer* 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.
*/
Layer* 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
};
Layer* fParent;
SkScalar m_opacity;
SkSize m_size;
SkPoint m_position;
SkPoint m_anchorPoint;
SkMatrix fMatrix;
SkMatrix fChildrenMatrix;
uint32_t fFlags;
SkTDArray<Layer*> m_children;
typedef SkRefCnt INHERITED;
};
#endif
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