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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.
*/
#ifndef Shape_h
#define Shape_h
#include "core/CoreExport.h"
#include "core/style/BasicShapes.h"
#include "core/style/StyleImage.h"
#include "platform/geometry/LayoutRect.h"
#include "platform/graphics/Path.h"
#include "platform/text/WritingMode.h"
#include <memory>
namespace blink {
class FloatRoundedRect;
struct LineSegment {
STACK_ALLOCATED();
LineSegment() : logicalLeft(0), logicalRight(0), isValid(false) {}
LineSegment(float logicalLeft, float logicalRight)
: logicalLeft(logicalLeft), logicalRight(logicalRight), isValid(true) {}
float logicalLeft;
float logicalRight;
bool isValid;
};
// 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 CORE_EXPORT Shape {
USING_FAST_MALLOC(Shape);
public:
struct DisplayPaths {
STACK_ALLOCATED();
Path shape;
Path marginShape;
};
static std::unique_ptr<Shape> createShape(const BasicShape*,
const LayoutSize& logicalBoxSize,
WritingMode,
float margin);
static std::unique_ptr<Shape> createRasterShape(Image*,
float threshold,
const LayoutRect& imageRect,
const LayoutRect& marginRect,
WritingMode,
float margin);
static std::unique_ptr<Shape> createEmptyRasterShape(WritingMode,
float margin);
static std::unique_ptr<Shape> createLayoutBoxShape(const FloatRoundedRect&,
WritingMode,
float margin);
virtual ~Shape() {}
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; }
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 blink
#endif // Shape_h
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