1/**
2 * Copyright (C) 2007 Rob Buis <buis@kde.org>
3 * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
4 * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
5 * Copyright (C) 2009 Google, Inc.  All rights reserved.
6 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * Library General Public License for more details.
17 *
18 * You should have received a copy of the GNU Library General Public License
19 * along with this library; see the file COPYING.LIB.  If not, write to
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
22 */
23
24#ifndef SVGRenderSupport_h
25#define SVGRenderSupport_h
26
27#if ENABLE(SVG)
28#include "PaintInfo.h"
29
30namespace WebCore {
31
32class FloatPoint;
33class FloatRect;
34class ImageBuffer;
35class RenderBoxModelObject;
36class RenderObject;
37class RenderStyle;
38class RenderSVGRoot;
39class TransformState;
40
41// SVGRendererSupport is a helper class sharing code between all SVG renderers.
42class SVGRenderSupport {
43public:
44    // Used by all SVG renderers who apply clip/filter/etc. resources to the renderer content
45    static bool prepareToRenderSVGContent(RenderObject*, PaintInfo&);
46    static void finishRenderSVGContent(RenderObject*, PaintInfo&, GraphicsContext* savedContext);
47
48    // Shares child layouting code between RenderSVGRoot/RenderSVG(Hidden)Container
49    static void layoutChildren(RenderObject*, bool selfNeedsLayout);
50
51    // Helper function determining wheter overflow is hidden
52    static bool isOverflowHidden(const RenderObject*);
53
54    // Calculates the repaintRect in combination with filter, clipper and masker in local coordinates.
55    static void intersectRepaintRectWithResources(const RenderObject*, FloatRect&);
56
57    // Determines whether the passed point lies in a clipping area
58    static bool pointInClippingArea(RenderObject*, const FloatPoint&);
59
60    static void computeContainerBoundingBoxes(const RenderObject* container, FloatRect& objectBoundingBox, FloatRect& strokeBoundingBox, FloatRect& repaintBoundingBox);
61    static bool paintInfoIntersectsRepaintRect(const FloatRect& localRepaintRect, const AffineTransform& localTransform, const PaintInfo&);
62
63    // Important functions used by nearly all SVG renderers centralizing coordinate transformations / repaint rect calculations
64    static IntRect clippedOverflowRectForRepaint(RenderObject*, RenderBoxModelObject* repaintContainer);
65    static void computeRectForRepaint(RenderObject*, RenderBoxModelObject* repaintContainer, IntRect&, bool fixed);
66    static void mapLocalToContainer(const RenderObject*, RenderBoxModelObject* repaintContainer, bool useTransforms, bool fixed, TransformState&);
67
68    // Shared between SVG renderers and resources.
69    static void applyStrokeStyleToContext(GraphicsContext*, const RenderStyle*, const RenderObject*);
70
71    // FIXME: These methods do not belong here.
72    static const RenderSVGRoot* findTreeRootObject(const RenderObject*);
73
74private:
75    // This class is not constructable.
76    SVGRenderSupport();
77    ~SVGRenderSupport();
78};
79
80} // namespace WebCore
81
82#endif // ENABLE(SVG)
83#endif // SVGRenderSupport_h
84