144 lines
5.2 KiB
C++
144 lines
5.2 KiB
C++
/*
|
|
* 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
|