1/**
2 * Copyright (C) 2007 Rob Buis <buis@kde.org>
3 *           (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
4 *           (C) 2007 Eric Seidel <eric@webkit.org>
5 * Copyright (C) 2009 Google, Inc.  All rights reserved.
6 *
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
11 *
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Library General Public License for more details.
16 *
17 * You should have received a copy of the GNU Library General Public License
18 * along with this library; see the file COPYING.LIB.  If not, write to
19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
20 * Boston, MA 02110-1301, USA.
21 *
22 */
23
24#ifndef SVGRenderBase_h
25#define SVGRenderBase_h
26
27#if ENABLE(SVG)
28#include "RenderObject.h"
29
30namespace WebCore {
31
32    class SVGResourceFilter;
33    class ImageBuffer;
34
35    // SVGRendererBase is an abstract base class which all SVG renderers inherit
36    // from in order to share SVG renderer code.
37    // FIXME: This code can all move into RenderSVGModelObject once
38    // all SVG renderers inherit from RenderSVGModelObject.
39    class SVGRenderBase {
40    public:
41        virtual ~SVGRenderBase();
42
43        virtual const SVGRenderBase* toSVGRenderBase() const { return this; }
44
45        // FIXME: These are only public for SVGRootInlineBox.
46        // It's unclear if these should be exposed or not.  SVGRootInlineBox may
47        // pass the wrong RenderObject* and boundingBox to these functions.
48        static bool prepareToRenderSVGContent(RenderObject*, RenderObject::PaintInfo&, const FloatRect& boundingBox, SVGResourceFilter*&, SVGResourceFilter* rootFilter = 0);
49        static void finishRenderSVGContent(RenderObject*, RenderObject::PaintInfo&, SVGResourceFilter*&, GraphicsContext* savedContext);
50
51        // Layout all children of the passed render object
52        static void layoutChildren(RenderObject*, bool selfNeedsLayout);
53
54        // Helper function determining wheter overflow is hidden
55        static bool isOverflowHidden(const RenderObject*);
56
57        virtual FloatRect strokeBoundingBox() const { return FloatRect(); }
58        virtual FloatRect markerBoundingBox() const { return FloatRect(); }
59
60        // returns the bounding box of filter, clipper, marker and masker (or the empty rect if no filter) in local coordinates
61        FloatRect filterBoundingBoxForRenderer(const RenderObject*) const;
62        FloatRect clipperBoundingBoxForRenderer(const RenderObject*) const;
63        FloatRect maskerBoundingBoxForRenderer(const RenderObject*) const;
64
65    protected:
66        static IntRect clippedOverflowRectForRepaint(RenderObject*, RenderBoxModelObject* repaintContainer);
67        static void computeRectForRepaint(RenderObject*, RenderBoxModelObject* repaintContainer, IntRect&, bool fixed);
68
69        static void mapLocalToContainer(const RenderObject*, RenderBoxModelObject* repaintContainer, bool useTransforms, bool fixed, TransformState&);
70
71        // Used to share the "walk all the children" logic between objectBoundingBox
72        // and repaintRectInLocalCoordinates in RenderSVGRoot and RenderSVGContainer
73        static FloatRect computeContainerBoundingBox(const RenderObject* container, bool includeAllPaintedContent);
74    };
75
76    // FIXME: This should move to RenderObject or PaintInfo
77    // Used for transforming the GraphicsContext and damage rect before passing PaintInfo to child renderers.
78    void applyTransformToPaintInfo(RenderObject::PaintInfo&, const AffineTransform& localToChildTransform);
79
80    // This offers a way to render parts of a WebKit rendering tree into a ImageBuffer.
81    void renderSubtreeToImage(ImageBuffer*, RenderObject*);
82
83    void clampImageBufferSizeToViewport(FrameView*, IntSize& imageBufferSize);
84} // namespace WebCore
85
86#endif // ENABLE(SVG)
87
88#endif // SVGRenderBase_h
89