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#pragma once
25
26#include "PaintInfo.h"
27#include "RenderObject.h"
28
29namespace WebCore {
30
31class FloatPoint;
32class FloatRect;
33class ImageBuffer;
34class LayoutRect;
35class RenderBoxModelObject;
36class RenderElement;
37class RenderGeometryMap;
38class RenderLayerModelObject;
39class RenderStyle;
40class RenderSVGRoot;
41class TransformState;
42
43// SVGRendererSupport is a helper class sharing code between all SVG renderers.
44class SVGRenderSupport {
45public:
46 static void layoutDifferentRootIfNeeded(const RenderElement&);
47
48 // Shares child layouting code between RenderSVGRoot/RenderSVG(Hidden)Container
49 static void layoutChildren(RenderElement&, bool selfNeedsLayout);
50
51 // Helper function determining wheter overflow is hidden
52 static bool isOverflowHidden(const RenderElement&);
53
54 // Calculates the repaintRect in combination with filter, clipper and masker in local coordinates.
55 static void intersectRepaintRectWithResources(const RenderElement&, FloatRect&);
56
57 // Determines whether a container needs to be laid out because it's filtered and a child is being laid out.
58 static bool filtersForceContainerLayout(const RenderElement&);
59
60 // Determines whether the passed point lies in a clipping area
61 static bool pointInClippingArea(const RenderElement&, const FloatPoint&);
62
63 static void computeContainerBoundingBoxes(const RenderElement& container, FloatRect& objectBoundingBox, bool& objectBoundingBoxValid, FloatRect& strokeBoundingBox, FloatRect& repaintBoundingBox);
64 static bool paintInfoIntersectsRepaintRect(const FloatRect& localRepaintRect, const AffineTransform& localTransform, const PaintInfo&);
65
66 // Important functions used by nearly all SVG renderers centralizing coordinate transformations / repaint rect calculations
67 static LayoutRect clippedOverflowRectForRepaint(const RenderElement&, const RenderLayerModelObject* repaintContainer);
68 static Optional<FloatRect> computeFloatVisibleRectInContainer(const RenderElement&, const FloatRect&, const RenderLayerModelObject* container, RenderObject::VisibleRectContext);
69 static const RenderElement& localToParentTransform(const RenderElement&, AffineTransform &);
70 static void mapLocalToContainer(const RenderElement&, const RenderLayerModelObject* repaintContainer, TransformState&, bool* wasFixed);
71 static const RenderElement* pushMappingToContainer(const RenderElement&, const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap&);
72 static bool checkForSVGRepaintDuringLayout(const RenderElement&);
73
74 // Shared between SVG renderers and resources.
75 static void applyStrokeStyleToContext(GraphicsContext*, const RenderStyle&, const RenderElement&);
76
77 // Determines if any ancestor's transform has changed.
78 static bool transformToRootChanged(RenderElement*);
79
80 static void clipContextToCSSClippingArea(GraphicsContext&, const RenderElement& renderer);
81
82 static void styleChanged(RenderElement&, const RenderStyle*);
83
84#if ENABLE(CSS_COMPOSITING)
85 static bool isolatesBlending(const RenderStyle&);
86 static void updateMaskedAncestorShouldIsolateBlending(const RenderElement&);
87#endif
88
89 static RenderSVGRoot* findTreeRootObject(RenderElement&);
90 static const RenderSVGRoot* findTreeRootObject(const RenderElement&);
91
92private:
93 // This class is not constructable.
94 SVGRenderSupport();
95 ~SVGRenderSupport();
96};
97
98} // namespace WebCore
99