/*
* Copyright (C) 2010 Google 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;
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef ImageOrientation_h
#define ImageOrientation_h
#include "platform/PlatformExport.h"
namespace WebCore {
class AffineTransform;
class FloatSize;
// This enum intentionally matches the orientation values from the EXIF spec.
// See JEITA CP-3451, page 18. http://www.exif.org/Exif2-2.PDF
enum ImageOrientationEnum {
// "TopLeft" means that the 0 row starts at the Top, the 0 column starts at the Left.
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
// All other values are "reserved" as of EXIF 2.2
DefaultImageOrientation = OriginTopLeft,
};
enum RespectImageOrientationEnum {
DoNotRespectImageOrientation = 0,
RespectImageOrientation = 1
};
class PLATFORM_EXPORT ImageOrientation {
public:
ImageOrientation(ImageOrientationEnum orientation = DefaultImageOrientation)
: m_orientation(orientation)
{
}
bool usesWidthAsHeight() const
{
// Values 5 through 8 all flip the width/height.
return m_orientation >= OriginLeftTop;
}
// ImageOrientationEnum currently matches EXIF values, however code outside
// this function should never assume that.
static ImageOrientation fromEXIFValue(int exifValue)
{
// Values direct from images may be invalid, in which case we use the default.
if (exifValue < OriginTopLeft || exifValue > OriginLeftBottom)
return DefaultImageOrientation;
return static_cast<ImageOrientationEnum>(exifValue);
}
// This transform can be used for drawing an image according to the orientation.
// It should be used in a right-handed coordinate system.
AffineTransform transformFromDefault(const FloatSize& drawnSize) const;
inline bool operator==(const ImageOrientation& other) const { return other.m_orientation == m_orientation; }
inline bool operator!=(const ImageOrientation& other) const { return !(*this == other); }
private:
// FIXME: This only needs to be one byte.
ImageOrientationEnum m_orientation;
};
} // namespace WebCore
#endif // ImageOrientation_h