| /* |
| * 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; |
| * 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. |
| */ |
| |
| #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 |