ImageOrientation.h [plain text]
#pragma once
#include "AffineTransform.h"
#include "FloatSize.h"
#include <wtf/EnumTraits.h>
namespace WebCore {
struct ImageOrientation {
enum Orientation {
FromImage = 0,
OriginTopLeft = 1, OriginTopRight = 2, OriginBottomRight = 3, OriginBottomLeft = 4, OriginLeftTop = 5, OriginRightTop = 6, OriginRightBottom = 7, OriginLeftBottom = 8,
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));
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 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
>;
};
}