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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BoxReflection_h
#define BoxReflection_h
#include "platform/PlatformExport.h"
#include "third_party/skia/include/core/SkPicture.h"
#include "third_party/skia/include/core/SkRefCnt.h"
class SkMatrix;
namespace blink {
class FloatRect;
// A reflection, as created by -webkit-box-reflect. Consists of:
// * a direction (either vertical or horizontal)
// * an offset to be applied to the reflection after flipping about the
// x- or y-axis, according to the direction
// * a mask image, which will be applied to the reflection before the
// reflection matrix is applied
class PLATFORM_EXPORT BoxReflection {
public:
enum ReflectionDirection {
// Vertically flipped (to appear above or below).
VerticalReflection,
// Horizontally flipped (to appear to the left or right).
HorizontalReflection,
};
BoxReflection(ReflectionDirection direction,
float offset,
sk_sp<SkPicture> mask = nullptr)
: m_direction(direction), m_offset(offset), m_mask(std::move(mask)) {}
ReflectionDirection direction() const { return m_direction; }
float offset() const { return m_offset; }
SkPicture* mask() const { return m_mask.get(); }
// Returns a matrix which maps points between the original content and its
// reflection. Reflections are self-inverse, so this matrix can be used to
// map in either direction.
SkMatrix reflectionMatrix() const;
// Maps a source rectangle to the destination rectangle it can affect,
// including this reflection. Due to the symmetry of reflections, this can
// also be used to map from a destination rectangle to the source rectangle
// which contributes to it.
FloatRect mapRect(const FloatRect&) const;
private:
ReflectionDirection m_direction;
float m_offset;
sk_sp<SkPicture> m_mask;
};
inline bool operator==(const BoxReflection& a, const BoxReflection& b) {
return a.direction() == b.direction() && a.offset() == b.offset() &&
a.mask() == b.mask();
}
inline bool operator!=(const BoxReflection& a, const BoxReflection& b) {
return !(a == b);
}
} // namespace blink
#endif // BoxReflection_h
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