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 blink { 43 44 struct LineSegment { 45 LineSegment() 46 : logicalLeft(0) 47 , logicalRight(0) 48 , isValid(false) 49 { 50 } 51 52 LineSegment(float logicalLeft, float logicalRight) 53 : logicalLeft(logicalLeft) 54 , logicalRight(logicalRight) 55 , isValid(true) 56 { 57 } 58 59 float logicalLeft; 60 float logicalRight; 61 bool isValid; 62 }; 63 64 // A representation of a BasicShape that enables layout code to determine how to break a line up into segments 65 // that will fit within or around a shape. The line is defined by a pair of logical Y coordinates and the 66 // computed segments are returned as pairs of logical X coordinates. The BasicShape itself is defined in 67 // physical coordinates. 68 69 class Shape { 70 public: 71 struct DisplayPaths { 72 Path shape; 73 Path marginShape; 74 }; 75 static PassOwnPtr<Shape> createShape(const BasicShape*, const LayoutSize& logicalBoxSize, WritingMode, float margin); 76 static PassOwnPtr<Shape> createRasterShape(Image*, float threshold, const LayoutRect& imageRect, const LayoutRect& marginRect, WritingMode, float margin); 77 static PassOwnPtr<Shape> createEmptyRasterShape(WritingMode, float margin); 78 static PassOwnPtr<Shape> createLayoutBoxShape(const RoundedRect&, WritingMode, float margin); 79 80 virtual ~Shape() { } 81 82 virtual LayoutRect shapeMarginLogicalBoundingBox() const = 0; 83 virtual bool isEmpty() const = 0; 84 virtual LineSegment getExcludedInterval(LayoutUnit logicalTop, LayoutUnit logicalHeight) const = 0; 85 86 bool lineOverlapsShapeMarginBounds(LayoutUnit lineTop, LayoutUnit lineHeight) const { return lineOverlapsBoundingBox(lineTop, lineHeight, shapeMarginLogicalBoundingBox()); } 87 virtual void buildDisplayPaths(DisplayPaths&) const = 0; 88 89 protected: 90 float shapeMargin() const { return m_margin; } 91 92 private: 93 bool lineOverlapsBoundingBox(LayoutUnit lineTop, LayoutUnit lineHeight, const LayoutRect& rect) const 94 { 95 if (rect.isEmpty()) 96 return false; 97 return (lineTop < rect.maxY() && lineTop + lineHeight > rect.y()) || (!lineHeight && lineTop == rect.y()); 98 } 99 100 WritingMode m_writingMode; 101 float m_margin; 102 }; 103 104 } // namespace blink 105 106 #endif // Shape_h 107