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 "LayoutRect.h" 34#include "Path.h" 35#include "WritingMode.h" 36 37namespace WebCore { 38 39struct LineSegment { 40 LineSegment(float logicalLeft, float logicalRight) 41 : logicalLeft(logicalLeft) 42 , logicalRight(logicalRight) 43 { 44 } 45 46 float logicalLeft; 47 float logicalRight; 48}; 49 50class BasicShape; 51class Image; 52class RoundedRect; 53 54typedef Vector<LineSegment> SegmentList; 55 56 57// A representation of a BasicShape that enables layout code to determine how to break a line up into segments 58// that will fit within or around a shape. The line is defined by a pair of logical Y coordinates and the 59// computed segments are returned as pairs of logical X coordinates. The BasicShape itself is defined in 60// physical coordinates. 61 62class Shape { 63public: 64 struct DisplayPaths { 65 Path shape; 66 Path marginShape; 67 }; 68 69 static std::unique_ptr<Shape> createShape(const BasicShape*, const LayoutSize& logicalBoxSize, WritingMode, float margin); 70 static std::unique_ptr<Shape> createRasterShape(Image*, float threshold, const LayoutRect& imageRect, const LayoutRect& marginRect, WritingMode, float margin); 71 static std::unique_ptr<Shape> createBoxShape(const RoundedRect&, WritingMode, float margin); 72 73 virtual ~Shape() { } 74 75 virtual LayoutRect shapeMarginLogicalBoundingBox() const = 0; 76 virtual bool isEmpty() const = 0; 77 virtual void getExcludedIntervals(LayoutUnit logicalTop, LayoutUnit logicalHeight, SegmentList&) const = 0; 78 79 bool lineOverlapsShapeMarginBounds(LayoutUnit lineTop, LayoutUnit lineHeight) const { return lineOverlapsBoundingBox(lineTop, lineHeight, shapeMarginLogicalBoundingBox()); } 80 81 virtual void buildDisplayPaths(DisplayPaths&) const = 0; 82 83protected: 84 float shapeMargin() const { return m_margin; } 85 86private: 87 bool lineOverlapsBoundingBox(LayoutUnit lineTop, LayoutUnit lineHeight, const LayoutRect& rect) const 88 { 89 if (rect.isEmpty()) 90 return false; 91 return (lineTop < rect.maxY() && lineTop + lineHeight > rect.y()) || (!lineHeight && lineTop == rect.y()); 92 } 93 94 WritingMode m_writingMode; 95 float m_margin; 96}; 97 98} // namespace WebCore 99 100#endif // Shape_h 101