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      1 /**
      2  * Copyright (C) 2007 Rob Buis <buis (at) kde.org>
      3  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann (at) kde.org>
      4  * Copyright (C) 2007 Eric Seidel <eric (at) 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 namespace blink {
     28 
     29 class AffineTransform;
     30 class FloatPoint;
     31 class FloatRect;
     32 class GraphicsContext;
     33 class PaintInvalidationState;
     34 class LayoutRect;
     35 struct PaintInfo;
     36 class Path;
     37 class RenderGeometryMap;
     38 class RenderLayerModelObject;
     39 class RenderObject;
     40 class RenderStyle;
     41 class RenderSVGRoot;
     42 class StrokeData;
     43 class TransformState;
     44 
     45 class SVGRenderSupport {
     46 public:
     47     // Shares child layouting code between RenderSVGRoot/RenderSVG(Hidden)Container
     48     static void layoutChildren(RenderObject*, bool selfNeedsLayout);
     49 
     50     // Layout resources used by this node.
     51     static void layoutResourcesIfNeeded(const RenderObject*);
     52 
     53     // Helper function determining wheter overflow is hidden
     54     static bool isOverflowHidden(const RenderObject*);
     55 
     56     // Calculates the paintInvalidationRect in combination with filter, clipper and masker in local coordinates.
     57     static void intersectPaintInvalidationRectWithResources(const RenderObject*, FloatRect&);
     58 
     59     // Determines whether a container needs to be laid out because it's filtered and a child is being laid out.
     60     static bool filtersForceContainerLayout(RenderObject*);
     61 
     62     // Determines whether the passed point lies in a clipping area
     63     static bool pointInClippingArea(RenderObject*, const FloatPoint&);
     64 
     65     // Transform |pointInParent| to |object|'s user-space and check if it is
     66     // within the clipping area. Returns false if the transform is singular or
     67     // the point is outside the clipping area.
     68     static bool transformToUserSpaceAndCheckClipping(RenderObject*, const AffineTransform& localTransform, const FloatPoint& pointInParent, FloatPoint& localPoint);
     69 
     70     static void computeContainerBoundingBoxes(const RenderObject* container, FloatRect& objectBoundingBox, bool& objectBoundingBoxValid, FloatRect& strokeBoundingBox, FloatRect& paintInvalidationBoundingBox);
     71 
     72     static bool paintInfoIntersectsPaintInvalidationRect(const FloatRect& localPaintInvalidationRect, const AffineTransform& localTransform, const PaintInfo&);
     73 
     74     // Important functions used by nearly all SVG renderers centralizing coordinate transformations / paint invalidation rect calculations
     75     static LayoutRect clippedOverflowRectForPaintInvalidation(const RenderObject*, const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState*);
     76     static void computeFloatRectForPaintInvalidation(const RenderObject*, const RenderLayerModelObject* paintInvalidationContainer, FloatRect&, const PaintInvalidationState*);
     77     static void mapLocalToContainer(const RenderObject*, const RenderLayerModelObject* paintInvalidationContainer, TransformState&, bool* wasFixed = 0, const PaintInvalidationState* = 0);
     78     static const RenderObject* pushMappingToContainer(const RenderObject*, const RenderLayerModelObject* ancestorToStopAt, RenderGeometryMap&);
     79 
     80     // Shared between SVG renderers and resources.
     81     static void applyStrokeStyleToContext(GraphicsContext*, const RenderStyle*, const RenderObject*);
     82     static void applyStrokeStyleToStrokeData(StrokeData*, const RenderStyle*, const RenderObject*);
     83 
     84     // Fill and/or stroke the provided |path|.
     85     static void fillOrStrokePath(GraphicsContext*, unsigned short resourceMode, const Path&);
     86 
     87     // Determines if any ancestor's transform has changed.
     88     static bool transformToRootChanged(RenderObject*);
     89 
     90     // FIXME: These methods do not belong here.
     91     static const RenderSVGRoot* findTreeRootObject(const RenderObject*);
     92 
     93     // Helper method for determining if a RenderObject marked as text (isText()== true)
     94     // can/will be rendered as part of a <text>.
     95     static bool isRenderableTextNode(const RenderObject*);
     96 
     97 private:
     98     static void updateObjectBoundingBox(FloatRect& objectBoundingBox, bool& objectBoundingBoxValid, RenderObject* other, FloatRect otherBoundingBox);
     99     static bool layoutSizeOfNearestViewportChanged(const RenderObject* start);
    100 };
    101 
    102 } // namespace blink
    103 
    104 #endif // SVGRenderSupport_h
    105