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107 lines
3.9 KiB
C++
107 lines
3.9 KiB
C++
/*
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* Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef Shape_h
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#define Shape_h
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#include "core/rendering/style/BasicShapes.h"
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#include "core/rendering/style/StyleImage.h"
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#include "platform/geometry/LayoutRect.h"
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#include "platform/geometry/RoundedRect.h"
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#include "platform/graphics/Path.h"
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#include "platform/text/WritingMode.h"
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#include "wtf/PassOwnPtr.h"
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#include "wtf/Vector.h"
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namespace blink {
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struct LineSegment {
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LineSegment()
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: logicalLeft(0)
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, logicalRight(0)
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, isValid(false)
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{
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}
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LineSegment(float logicalLeft, float logicalRight)
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: logicalLeft(logicalLeft)
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, logicalRight(logicalRight)
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, isValid(true)
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{
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}
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float logicalLeft;
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float logicalRight;
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bool isValid;
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};
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// A representation of a BasicShape that enables layout code to determine how to break a line up into segments
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// that will fit within or around a shape. The line is defined by a pair of logical Y coordinates and the
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// computed segments are returned as pairs of logical X coordinates. The BasicShape itself is defined in
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// physical coordinates.
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class Shape {
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public:
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struct DisplayPaths {
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Path shape;
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Path marginShape;
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};
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static PassOwnPtr<Shape> createShape(const BasicShape*, const LayoutSize& logicalBoxSize, WritingMode, float margin);
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static PassOwnPtr<Shape> createRasterShape(Image*, float threshold, const LayoutRect& imageRect, const LayoutRect& marginRect, WritingMode, float margin);
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static PassOwnPtr<Shape> createEmptyRasterShape(WritingMode, float margin);
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static PassOwnPtr<Shape> createLayoutBoxShape(const RoundedRect&, WritingMode, float margin);
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virtual ~Shape() { }
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virtual LayoutRect shapeMarginLogicalBoundingBox() const = 0;
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virtual bool isEmpty() const = 0;
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virtual LineSegment getExcludedInterval(LayoutUnit logicalTop, LayoutUnit logicalHeight) const = 0;
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bool lineOverlapsShapeMarginBounds(LayoutUnit lineTop, LayoutUnit lineHeight) const { return lineOverlapsBoundingBox(lineTop, lineHeight, shapeMarginLogicalBoundingBox()); }
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virtual void buildDisplayPaths(DisplayPaths&) const = 0;
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protected:
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float shapeMargin() const { return m_margin; }
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private:
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bool lineOverlapsBoundingBox(LayoutUnit lineTop, LayoutUnit lineHeight, const LayoutRect& rect) const
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{
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if (rect.isEmpty())
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return false;
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return (lineTop < rect.maxY() && lineTop + lineHeight > rect.y()) || (!lineHeight && lineTop == rect.y());
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}
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WritingMode m_writingMode;
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float m_margin;
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};
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} // namespace blink
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#endif // Shape_h
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