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