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