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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_BOX_REFLECTION_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_BOX_REFLECTION_H_
#include "third_party/blink/renderer/platform/graphics/paint/paint_record.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
#include "third_party/skia/include/core/SkRefCnt.h"
#include "ui/gfx/geometry/rect_f.h"
class SkMatrix;
namespace blink {
// 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 {
DISALLOW_NEW();
public:
enum ReflectionDirection {
// Vertically flipped (to appear above or below).
kVerticalReflection,
// Horizontally flipped (to appear to the left or right).
kHorizontalReflection,
};
BoxReflection(ReflectionDirection direction, float offset);
BoxReflection(ReflectionDirection direction,
float offset,
PaintRecord mask,
const gfx::RectF& mask_bounds);
BoxReflection(const BoxReflection& reflection);
~BoxReflection();
ReflectionDirection Direction() const { return direction_; }
float Offset() const { return offset_; }
const PaintRecord& Mask() const { return mask_; }
const gfx::RectF& MaskBounds() const { return mask_bounds_; }
// 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.
gfx::RectF MapRect(const gfx::RectF&) const;
private:
ReflectionDirection direction_;
float offset_;
PaintRecord mask_;
gfx::RectF mask_bounds_;
};
inline bool operator==(const BoxReflection& a, const BoxReflection& b) {
return a.Direction() == b.Direction() && a.Offset() == b.Offset() &&
// False negatives are allowed, but not false positives.
a.Mask().empty() && b.Mask().empty() &&
a.MaskBounds() == b.MaskBounds();
}
inline bool operator!=(const BoxReflection& a, const BoxReflection& b) {
return !(a == b);
}
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_BOX_REFLECTION_H_
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