BasicShapes.h   [plain text]

/*
 * 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 HOLDER "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 BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
 * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 */

#ifndef BasicShapes_h
#define BasicShapes_h

#include "Length.h"
#include "LengthSize.h"
#include "RenderStyleConstants.h"
#include "WindRule.h"
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
#include <wtf/TypeCasts.h>
#include <wtf/Vector.h>

namespace WebCore {

class FloatRect;
class Path;
class RenderBox;

class BasicShape : public RefCounted<BasicShape> {
public:
    virtual ~BasicShape() { }

    enum Type {
        BasicShapePolygonType,
        BasicShapeCircleType,
        BasicShapeEllipseType,
        BasicShapeInsetType
    };

    bool canBlend(const BasicShape&) const;

    virtual void path(Path&, const FloatRect&) = 0;
    virtual WindRule windRule() const { return RULE_NONZERO; }
    virtual Ref<BasicShape> blend(const BasicShape&, double) const = 0;

    virtual Type type() const = 0;
};

class BasicShapeCenterCoordinate {
public:
    enum Direction {
        TopLeft,
        BottomRight
    };

    BasicShapeCenterCoordinate()
        : m_direction(TopLeft)
        , m_length(Undefined)
    {
        updateComputedLength();
    }

    BasicShapeCenterCoordinate(Direction direction, Length length)
        : m_direction(direction)
        , m_length(length)
    {
        updateComputedLength();
    }

    BasicShapeCenterCoordinate(const BasicShapeCenterCoordinate& other)
        : m_direction(other.direction())
        , m_length(other.length())
        , m_computedLength(other.m_computedLength)
    {
    }

    Direction direction() const { return m_direction; }
    const Length& length() const { return m_length; }
    const Length& computedLength() const { return m_computedLength; }

    BasicShapeCenterCoordinate blend(const BasicShapeCenterCoordinate& other, double progress) const
    {
        return BasicShapeCenterCoordinate(TopLeft, m_computedLength.blend(other.m_computedLength, progress));
    }

private:
    Direction m_direction;
    Length m_length;
    Length m_computedLength;

    void updateComputedLength();
};

class BasicShapeRadius {
public:
    enum Type {
        Value,
        ClosestSide,
        FarthestSide
    };
    BasicShapeRadius() : m_value(Undefined), m_type(ClosestSide) { }
    explicit BasicShapeRadius(Length v) : m_value(v), m_type(Value) { }
    explicit BasicShapeRadius(Type t) : m_value(Undefined), m_type(t) { }
    BasicShapeRadius(const BasicShapeRadius& other) : m_value(other.value()), m_type(other.type()) { }

    const Length& value() const { return m_value; }
    Type type() const { return m_type; }

    bool canBlend(const BasicShapeRadius& other) const
    {
        // FIXME determine how to interpolate between keywords. See bug 125108.
        return m_type == Value && other.type() == Value;
    }

    BasicShapeRadius blend(const BasicShapeRadius& other, double progress) const
    {
        if (m_type != Value || other.type() != Value)
            return BasicShapeRadius(other);

        return BasicShapeRadius(m_value.blend(other.value(), progress));
    }

private:
    Length m_value;
    Type m_type;

};

class BasicShapeCircle final : public BasicShape {
public:
    static Ref<BasicShapeCircle> create() { return adoptRef(*new BasicShapeCircle); }

    const BasicShapeCenterCoordinate& centerX() const { return m_centerX; }
    const BasicShapeCenterCoordinate& centerY() const { return m_centerY; }
    const BasicShapeRadius& radius() const { return m_radius; }
    float floatValueForRadiusInBox(float boxWidth, float boxHeight) const;

    void setCenterX(BasicShapeCenterCoordinate centerX) { m_centerX = WTF::move(centerX); }
    void setCenterY(BasicShapeCenterCoordinate centerY) { m_centerY = WTF::move(centerY); }
    void setRadius(BasicShapeRadius radius) { m_radius = WTF::move(radius); }

    virtual void path(Path&, const FloatRect&) override;
    virtual Ref<BasicShape> blend(const BasicShape&, double) const override;

    virtual Type type() const override { return BasicShapeCircleType; }
private:
    BasicShapeCircle() { }

    BasicShapeCenterCoordinate m_centerX;
    BasicShapeCenterCoordinate m_centerY;
    BasicShapeRadius m_radius;
};

class BasicShapeEllipse final : public BasicShape {
public:
    static Ref<BasicShapeEllipse> create() { return adoptRef(*new BasicShapeEllipse); }

    const BasicShapeCenterCoordinate& centerX() const { return m_centerX; }
    const BasicShapeCenterCoordinate& centerY() const { return m_centerY; }
    const BasicShapeRadius& radiusX() const { return m_radiusX; }
    const BasicShapeRadius& radiusY() const { return m_radiusY; }
    float floatValueForRadiusInBox(const BasicShapeRadius&, float center, float boxWidthOrHeight) const;

    void setCenterX(BasicShapeCenterCoordinate centerX) { m_centerX = WTF::move(centerX); }
    void setCenterY(BasicShapeCenterCoordinate centerY) { m_centerY = WTF::move(centerY); }
    void setRadiusX(BasicShapeRadius radiusX) { m_radiusX = WTF::move(radiusX); }
    void setRadiusY(BasicShapeRadius radiusY) { m_radiusY = WTF::move(radiusY); }

    virtual void path(Path&, const FloatRect&) override;
    virtual Ref<BasicShape> blend(const BasicShape&, double) const override;

    virtual Type type() const override { return BasicShapeEllipseType; }
private:
    BasicShapeEllipse() { }

    BasicShapeCenterCoordinate m_centerX;
    BasicShapeCenterCoordinate m_centerY;
    BasicShapeRadius m_radiusX;
    BasicShapeRadius m_radiusY;
};

class BasicShapePolygon final : public BasicShape {
public:
    static Ref<BasicShapePolygon> create() { return adoptRef(*new BasicShapePolygon); }

    const Vector<Length>& values() const { return m_values; }
    const Length& getXAt(unsigned i) const { return m_values[2 * i]; }
    const Length& getYAt(unsigned i) const { return m_values[2 * i + 1]; }

    void setWindRule(WindRule windRule) { m_windRule = windRule; }
    void appendPoint(Length x, Length y) { m_values.append(WTF::move(x)); m_values.append(WTF::move(y)); }

    virtual void path(Path&, const FloatRect&) override;
    virtual Ref<BasicShape> blend(const BasicShape&, double) const override;

    virtual WindRule windRule() const override { return m_windRule; }

    virtual Type type() const override { return BasicShapePolygonType; }
private:
    BasicShapePolygon()
        : m_windRule(RULE_NONZERO)
    { }

    WindRule m_windRule;
    Vector<Length> m_values;
};

class BasicShapeInset final : public BasicShape {
public:
    static Ref<BasicShapeInset> create() { return adoptRef(*new BasicShapeInset); }

    const Length& top() const { return m_top; }
    const Length& right() const { return m_right; }
    const Length& bottom() const { return m_bottom; }
    const Length& left() const { return m_left; }

    const LengthSize& topLeftRadius() const { return m_topLeftRadius; }
    const LengthSize& topRightRadius() const { return m_topRightRadius; }
    const LengthSize& bottomRightRadius() const { return m_bottomRightRadius; }
    const LengthSize& bottomLeftRadius() const { return m_bottomLeftRadius; }

    void setTop(Length top) { m_top = WTF::move(top); }
    void setRight(Length right) { m_right = WTF::move(right); }
    void setBottom(Length bottom) { m_bottom = WTF::move(bottom); }
    void setLeft(Length left) { m_left = WTF::move(left); }

    void setTopLeftRadius(LengthSize radius) { m_topLeftRadius = WTF::move(radius); }
    void setTopRightRadius(LengthSize radius) { m_topRightRadius = WTF::move(radius); }
    void setBottomRightRadius(LengthSize radius) { m_bottomRightRadius = WTF::move(radius); }
    void setBottomLeftRadius(LengthSize radius) { m_bottomLeftRadius = WTF::move(radius); }

    virtual void path(Path&, const FloatRect&) override;
    virtual Ref<BasicShape> blend(const BasicShape&, double) const override;

    virtual Type type() const override { return BasicShapeInsetType; }
private:
    BasicShapeInset() { }

    Length m_right;
    Length m_top;
    Length m_bottom;
    Length m_left;

    LengthSize m_topLeftRadius;
    LengthSize m_topRightRadius;
    LengthSize m_bottomRightRadius;
    LengthSize m_bottomLeftRadius;
};

} // namespace WebCore

#define SPECIALIZE_TYPE_TRAITS_BASIC_SHAPE(ToValueTypeName, predicate) \
SPECIALIZE_TYPE_TRAITS_BEGIN(WebCore::ToValueTypeName) \
    static bool isType(const WebCore::BasicShape& basicShape) { return basicShape.type() == WebCore::predicate; } \
SPECIALIZE_TYPE_TRAITS_END()

SPECIALIZE_TYPE_TRAITS_BASIC_SHAPE(BasicShapeCircle, BasicShape::BasicShapeCircleType)
SPECIALIZE_TYPE_TRAITS_BASIC_SHAPE(BasicShapeEllipse, BasicShape::BasicShapeEllipseType)
SPECIALIZE_TYPE_TRAITS_BASIC_SHAPE(BasicShapePolygon, BasicShape::BasicShapePolygonType)
SPECIALIZE_TYPE_TRAITS_BASIC_SHAPE(BasicShapeInset, BasicShape::BasicShapeInsetType)

#endif // BasicShapes_h