SVGRenderSupport.h   [plain text]

 * Copyright (C) 2007 Rob Buis <>
 *           (C) 2007 Nikolas Zimmermann <>
 *           (C) 2007 Eric Seidel <>
 * Copyright (C) 2009 Google, Inc.  All rights reserved.
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * Library General Public License for more details.
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.

#ifndef SVGRenderBase_h
#define SVGRenderBase_h

#include "DashArray.h"
#include "RenderObject.h"
#include "SVGElement.h"
#include "SVGStyledElement.h"

namespace WebCore {

class RenderSVGResourceFilter;
class ImageBuffer;

// SVGRendererBase is an abstract base class which all SVG renderers inherit
// from in order to share SVG renderer code.
// FIXME: This code can all move into RenderSVGModelObject once
// all SVG renderers inherit from RenderSVGModelObject.
class SVGRenderBase {
    virtual ~SVGRenderBase();

    // FIXME: These are only public for SVGRootInlineBox.
    // It's unclear if these should be exposed or not.  SVGRootInlineBox may
    // pass the wrong RenderObject* and boundingBox to these functions.
    static bool prepareToRenderSVGContent(RenderObject*, RenderObject::PaintInfo&, const FloatRect& boundingBox, RenderSVGResourceFilter*&, RenderSVGResourceFilter* rootFilter = 0);
    static void finishRenderSVGContent(RenderObject*, RenderObject::PaintInfo&, RenderSVGResourceFilter*&, GraphicsContext* savedContext);

    // Layout all children of the passed render object
    static void layoutChildren(RenderObject*, bool selfNeedsLayout);

    // Helper function determining wheter overflow is hidden
    static bool isOverflowHidden(const RenderObject*);

    // strokeBoundingBox() includes the marker boundaries for a RenderPath object
    virtual FloatRect strokeBoundingBox() const { return FloatRect(); }

    // Calculates the repaintRect in combination with filter, clipper and masker in local coordinates.
    void intersectRepaintRectWithResources(const RenderObject*, FloatRect&) const;

    static IntRect clippedOverflowRectForRepaint(RenderObject*, RenderBoxModelObject* repaintContainer);
    static void computeRectForRepaint(RenderObject*, RenderBoxModelObject* repaintContainer, IntRect&, bool fixed);

    static void mapLocalToContainer(const RenderObject*, RenderBoxModelObject* repaintContainer, bool useTransforms, bool fixed, TransformState&);

    // Used to share the "walk all the children" logic between objectBoundingBox
    // and repaintRectInLocalCoordinates in RenderSVGRoot and RenderSVGContainer
    static FloatRect computeContainerBoundingBox(const RenderObject* container, bool includeAllPaintedContent);

// FIXME: This should move to RenderObject or PaintInfo
// Used for transforming the GraphicsContext and damage rect before passing PaintInfo to child renderers.
void applyTransformToPaintInfo(RenderObject::PaintInfo&, const AffineTransform& localToChildTransform);

// This offers a way to render parts of a WebKit rendering tree into a ImageBuffer.
void renderSubtreeToImage(ImageBuffer*, RenderObject*);

void deregisterFromResources(RenderObject*);
void clampImageBufferSizeToViewport(FrameView*, IntSize& imageBufferSize);

void applyStrokeStyleToContext(GraphicsContext*, const RenderStyle*, const RenderObject*);
DashArray dashArrayFromRenderingStyle(const RenderStyle* style, RenderStyle* rootStyle);

const RenderObject* findTextRootObject(const RenderObject* start);

} // namespace WebCore

#endif // ENABLE(SVG)

#endif // SVGRenderBase_h