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#include "PaintInfo.h" 28 29namespace WebCore { 30 31class FloatPoint; 32class FloatRect; 33class ImageBuffer; 34class LayoutRect; 35class RenderBoxModelObject; 36class RenderElement; 37class RenderGeometryMap; 38class RenderLayerModelObject; 39class RenderObject; 40class RenderStyle; 41class RenderSVGRoot; 42class TransformState; 43 44// SVGRendererSupport is a helper class sharing code between all SVG renderers. 45class SVGRenderSupport { 46public: 47 // Shares child layouting code between RenderSVGRoot/RenderSVG(Hidden)Container 48 static void layoutChildren(RenderElement&, bool selfNeedsLayout); 49 50 // Helper function determining wheter overflow is hidden 51 static bool isOverflowHidden(const RenderElement&); 52 53 static void intersectRepaintRectWithShadows(const RenderElement&, FloatRect&); 54 55 // Calculates the repaintRect in combination with filter, clipper and masker in local coordinates. 56 static void intersectRepaintRectWithResources(const RenderElement&, FloatRect&); 57 58 // Determines whether a container needs to be laid out because it's filtered and a child is being laid out. 59 static bool filtersForceContainerLayout(const RenderElement&); 60 61 // Determines whether the passed point lies in a clipping area 62 static bool pointInClippingArea(const RenderElement&, const FloatPoint&); 63 64 static void computeContainerBoundingBoxes(const RenderElement& container, FloatRect& objectBoundingBox, bool& objectBoundingBoxValid, FloatRect& strokeBoundingBox, FloatRect& repaintBoundingBox); 65 static bool paintInfoIntersectsRepaintRect(const FloatRect& localRepaintRect, const AffineTransform& localTransform, const PaintInfo&); 66 67 // Important functions used by nearly all SVG renderers centralizing coordinate transformations / repaint rect calculations 68 static FloatRect repaintRectForRendererInLocalCoordinatesExcludingSVGShadow(const RenderElement&); 69 static LayoutRect clippedOverflowRectForRepaint(const RenderElement&, const RenderLayerModelObject* repaintContainer); 70 static void computeFloatRectForRepaint(const RenderElement&, const RenderLayerModelObject* repaintContainer, FloatRect&, bool fixed); 71 static void mapLocalToContainer(const RenderElement&, const RenderLayerModelObject* repaintContainer, TransformState&, bool* wasFixed = 0); 72 static const RenderElement* pushMappingToContainer(const RenderElement&, const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap&); 73 static bool checkForSVGRepaintDuringLayout(const RenderElement&); 74 75 // Shared between SVG renderers and resources. 76 static void applyStrokeStyleToContext(GraphicsContext*, const RenderStyle&, const RenderElement&); 77 78 // Determines if any ancestor's transform has changed. 79 static bool transformToRootChanged(RenderElement*); 80 81 // Helper functions to keep track of whether a renderer has an SVG shadow applied. 82 static bool rendererHasSVGShadow(const RenderObject&); 83 static void setRendererHasSVGShadow(RenderObject&, bool hasShadow); 84 85 static void childAdded(RenderElement& parent, RenderObject& child); 86 static void styleChanged(RenderElement&, const RenderStyle*); 87 88#if ENABLE(CSS_COMPOSITING) 89 static bool isolatesBlending(const RenderStyle&); 90 static void updateMaskedAncestorShouldIsolateBlending(const RenderElement&); 91#endif 92 93 // FIXME: These methods do not belong here. 94 static const RenderSVGRoot& findTreeRootObject(const RenderElement&); 95 96private: 97 // This class is not constructable. 98 SVGRenderSupport(); 99 ~SVGRenderSupport(); 100}; 101 102} // namespace WebCore 103 104#endif // SVGRenderSupport_h 105