1 /* 2 * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above 9 * copyright notice, this list of conditions and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above 12 * copyright notice, this list of conditions and the following 13 * disclaimer in the documentation and/or other materials 14 * provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 19 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 20 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 21 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 25 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 27 * OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #ifndef Shape_h 31 #define Shape_h 32 33 #include "core/rendering/style/BasicShapes.h" 34 #include "core/rendering/style/StyleImage.h" 35 #include "platform/geometry/LayoutRect.h" 36 #include "platform/text/WritingMode.h" 37 #include "wtf/PassOwnPtr.h" 38 #include "wtf/Vector.h" 39 40 namespace WebCore { 41 42 struct LineSegment { LineSegmentLineSegment43 LineSegment(float logicalLeft, float logicalRight) 44 : logicalLeft(logicalLeft) 45 , logicalRight(logicalRight) 46 { 47 } 48 49 float logicalLeft; 50 float logicalRight; 51 }; 52 53 typedef Vector<LineSegment> SegmentList; 54 55 56 // A representation of a BasicShape that enables layout code to determine how to break a line up into segments 57 // that will fit within or around a shape. The line is defined by a pair of logical Y coordinates and the 58 // computed segments are returned as pairs of logical X coordinates. The BasicShape itself is defined in 59 // physical coordinates. 60 61 class Shape { 62 public: 63 static PassOwnPtr<Shape> createShape(const BasicShape*, const LayoutSize& logicalBoxSize, WritingMode, Length margin, Length padding); 64 static PassOwnPtr<Shape> createShape(const StyleImage*, float threshold, const LayoutSize& logicalBoxSize, WritingMode, Length margin, Length padding); 65 static PassOwnPtr<Shape> createLayoutBoxShape(const LayoutSize& logicalBoxSize, WritingMode, const Length& margin, const Length& padding); 66 ~Shape()67 virtual ~Shape() { } 68 69 virtual LayoutRect shapeMarginLogicalBoundingBox() const = 0; 70 virtual LayoutRect shapePaddingLogicalBoundingBox() const = 0; 71 virtual bool isEmpty() const = 0; 72 virtual void getIncludedIntervals(LayoutUnit logicalTop, LayoutUnit logicalHeight, SegmentList&) const = 0; 73 virtual void getExcludedIntervals(LayoutUnit logicalTop, LayoutUnit logicalHeight, SegmentList&) const = 0; 74 virtual bool firstIncludedIntervalLogicalTop(LayoutUnit minLogicalIntervalTop, const LayoutSize& minLogicalIntervalSize, LayoutUnit& result) const = 0; lineOverlapsShapeMarginBounds(LayoutUnit lineTop,LayoutUnit lineHeight)75 bool lineOverlapsShapeMarginBounds(LayoutUnit lineTop, LayoutUnit lineHeight) const { return lineOverlapsBoundingBox(lineTop, lineHeight, shapeMarginLogicalBoundingBox()); } lineOverlapsShapePaddingBounds(LayoutUnit lineTop,LayoutUnit lineHeight)76 bool lineOverlapsShapePaddingBounds(LayoutUnit lineTop, LayoutUnit lineHeight) const { return lineOverlapsBoundingBox(lineTop, lineHeight, shapePaddingLogicalBoundingBox()); } 77 78 protected: shapeMargin()79 float shapeMargin() const { return m_margin; } shapePadding()80 float shapePadding() const { return m_padding; } 81 82 private: lineOverlapsBoundingBox(LayoutUnit lineTop,LayoutUnit lineHeight,const LayoutRect & rect)83 bool lineOverlapsBoundingBox(LayoutUnit lineTop, LayoutUnit lineHeight, const LayoutRect& rect) const 84 { 85 if (rect.isEmpty()) 86 return false; 87 return (lineTop < rect.maxY() && lineTop + lineHeight > rect.y()) || (!lineHeight && lineTop == rect.y()); 88 } 89 90 WritingMode m_writingMode; 91 float m_margin; 92 float m_padding; 93 }; 94 95 } // namespace WebCore 96 97 #endif // Shape_h 98