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/*
* Copyright (C) 2010 Google Inc. All rights reserved.
* Copyright (C) 2012-2019 Apple Inc. 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 APPLE AND ITS 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 APPLE OR ITS 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 "AffineTransform.h"
#include "FloatSize.h"
#include <wtf/EnumTraits.h>
namespace WebCore {
struct ImageOrientation {
enum Orientation {
FromImage = 0, // Orientation from the image should be respected.
// This range intentionally matches the orientation values from the EXIF spec.
// See JEITA CP-3451, page 18. http://www.exif.org/Exif2-2.PDF
OriginTopLeft = 1, // default
OriginTopRight = 2, // mirror along y-axis
OriginBottomRight = 3, // 180 degree rotation
OriginBottomLeft = 4, // mirror along the x-axis
OriginLeftTop = 5, // mirror along x-axis + 270 degree CW rotation
OriginRightTop = 6, // 90 degree CW rotation
OriginRightBottom = 7, // mirror along x-axis + 90 degree CW rotation
OriginLeftBottom = 8, // 270 degree CW rotation
None = OriginTopLeft
};
ImageOrientation() = default;
ImageOrientation(Orientation orientation)
: m_orientation(orientation)
{
}
static Orientation fromEXIFValue(int exifValue)
{
return isValidEXIFOrientation(exifValue) ? static_cast<Orientation>(exifValue) : None;
}
operator Orientation() const { return m_orientation; }
bool usesWidthAsHeight() const
{
ASSERT(isValidEXIFOrientation(m_orientation));
// Values 5 through 8 all flip the width/height.
return m_orientation >= OriginLeftTop && m_orientation <= OriginLeftBottom;
}
AffineTransform transformFromDefault(const FloatSize& drawnSize) const
{
float w = drawnSize.width();
float h = drawnSize.height();
switch (m_orientation) {
case FromImage:
ASSERT_NOT_REACHED();
return AffineTransform();
case OriginTopLeft:
return AffineTransform();
case OriginTopRight:
return AffineTransform(-1, 0, 0, 1, w, 0);
case OriginBottomRight:
return AffineTransform(-1, 0, 0, -1, w, h);
case OriginBottomLeft:
return AffineTransform( 1, 0, 0, -1, 0, h);
case OriginLeftTop:
return AffineTransform( 0, 1, 1, 0, 0, 0);
case OriginRightTop:
return AffineTransform( 0, 1, -1, 0, w, 0);
case OriginRightBottom:
return AffineTransform( 0, -1, -1, 0, w, h);
case OriginLeftBottom:
return AffineTransform( 0, -1, 1, 0, 0, h);
}
ASSERT_NOT_REACHED();
return AffineTransform();
}
private:
static const Orientation EXIFFirst = OriginTopLeft;
static const Orientation EXIFLast = OriginLeftBottom;
static const Orientation First = FromImage;
static const Orientation Last = EXIFLast;
static bool isValidOrientation(int orientation)
{
return orientation >= static_cast<int>(First) && orientation <= static_cast<int>(Last);
}
static bool isValidEXIFOrientation(int orientation)
{
return orientation >= static_cast<int>(EXIFFirst) && orientation <= static_cast<int>(EXIFLast);
}
Orientation m_orientation { None };
};
} // namespace WebCore
namespace WTF {
template<> struct EnumTraits<WebCore::ImageOrientation::Orientation> {
using values = EnumValues<
WebCore::ImageOrientation::Orientation,
WebCore::ImageOrientation::Orientation::FromImage,
WebCore::ImageOrientation::Orientation::OriginTopLeft,
WebCore::ImageOrientation::Orientation::OriginTopRight,
WebCore::ImageOrientation::Orientation::OriginBottomRight,
WebCore::ImageOrientation::Orientation::OriginBottomLeft,
WebCore::ImageOrientation::Orientation::OriginLeftTop,
WebCore::ImageOrientation::Orientation::OriginRightTop,
WebCore::ImageOrientation::Orientation::OriginRightBottom,
WebCore::ImageOrientation::Orientation::OriginLeftBottom
>;
};
} // namespace WTF
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