sky/engine/public/platform/WebLayer.h

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef SKY_ENGINE_PUBLIC_PLATFORM_WEBLAYER_H_
#define SKY_ENGINE_PUBLIC_PLATFORM_WEBLAYER_H_

#include "sky/engine/public/platform/WebBlendMode.h"
#include "sky/engine/public/platform/WebColor.h"
#include "sky/engine/public/platform/WebCommon.h"
#include "sky/engine/public/platform/WebFloatPoint3D.h"
#include "sky/engine/public/platform/WebPoint.h"
#include "sky/engine/public/platform/WebRect.h"
#include "sky/engine/public/platform/WebSize.h"
#include "sky/engine/public/platform/WebString.h"
#include "sky/engine/public/platform/WebVector.h"

class SkMatrix44;
class SkImageFilter;

namespace blink {
class WebLayerScrollClient;
struct WebFloatPoint;
struct WebFloatRect;
struct WebLayerPositionConstraint;

class WebLayer {
public:
    virtual ~WebLayer() { }

    // Returns a positive ID that will be unique across all WebLayers allocated in this process.
    virtual int id() const = 0;

    // These functions do not take ownership of the WebLayer* parameter.
    virtual void addChild(WebLayer*) = 0;
    virtual void insertChild(WebLayer*, size_t index) = 0;
    virtual void replaceChild(WebLayer* reference, WebLayer* newLayer) = 0;
    virtual void removeFromParent() = 0;
    virtual void removeAllChildren() = 0;

    virtual void setBounds(const WebSize&) = 0;
    virtual WebSize bounds() const = 0;

    virtual void setReplicaLayer(WebLayer*) = 0;

    virtual void setOpacity(float) = 0;
    virtual float opacity() const = 0;

    virtual void setBlendMode(WebBlendMode) = 0;
    virtual WebBlendMode blendMode() const = 0;

    virtual void setOpaque(bool) = 0;
    virtual bool opaque() const = 0;

    virtual void setPosition(const WebFloatPoint&) = 0;
    virtual WebFloatPoint position() const = 0;

    virtual void setTransform(const SkMatrix44&) = 0;
    virtual SkMatrix44 transform() const = 0;

    virtual void setTransformOrigin(const WebFloatPoint3D&) { }
    virtual WebFloatPoint3D transformOrigin() const { return WebFloatPoint3D(); }

    // Sets whether the layer draws its content when compositing.
    virtual void setDrawsContent(bool) = 0;
    virtual bool drawsContent() const = 0;

    // Sets whether the layer's transform should be flattened.
    virtual void setShouldFlattenTransform(bool) = 0;

    // Sets the id of the layer's 3d rendering context. Layers in the same 3d
    // rendering context id are sorted with one another according to their 3d
    // position rather than their tree order.
    virtual void setRenderingContext(int id) = 0;

    virtual void setBackgroundColor(WebColor) = 0;
    virtual WebColor backgroundColor() const = 0;

    // If a scroll parent is set, this layer will inherit its parent's scroll
    // delta and offset even though it will not be a descendant of the scroll
    // in the layer hierarchy.
    virtual void setScrollParent(WebLayer*) = 0;

    // A layer will not respect any clips established by layers between it and
    // its nearest clipping ancestor. Note, the clip parent must be an ancestor.
    // This is not a requirement of the scroll parent.
    virtual void setClipParent(WebLayer*) = 0;

    // Scrolling
    virtual void setScrollPosition(WebPoint) = 0;
    virtual WebPoint scrollPosition() const = 0;

    // To set a WebLayer as scrollable we must specify the corresponding clip layer.
    virtual void setScrollClipLayer(WebLayer*) = 0;

    // The scroll client is notified when the scroll position of the WebLayer
    // changes. Only a single scroll client can be set for a WebLayer at a time.
    // The WebLayer does not take ownership of the scroll client, and it is the
    // responsibility of the client to reset the layer's scroll client before
    // deleting the scroll client.
    virtual void setScrollClient(WebLayerScrollClient*) = 0;

    // Forces this layer to use a render surface. There is no benefit in doing
    // so, but this is to facilitate benchmarks and tests.
    virtual void setForceRenderSurface(bool) = 0;

    // True if the layer is not part of a tree attached to a WebLayerTreeView.
    virtual bool isOrphan() const = 0;
};

} // namespace blink

#endif  // SKY_ENGINE_PUBLIC_PLATFORM_WEBLAYER_H_