diff -r 000000000000 -r 6474c204b198 gfx/skia/trunk/include/utils/SkLayer.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/skia/trunk/include/utils/SkLayer.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,130 @@
+
+/*
+ * 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