/**
* @brief Get White Point information from raw exif data
* This is internal function and is not exposed to client
* @param [in] offset Offset to entry in bytes inside raw exif data
* @return White Point value
*
* If the image uses CIE Standard Illumination D65(known as international
* standard of 'daylight'), the values are '3127/10000,3290/10000'.
*/
std::vector<u_rational_t> ExifReader::getWhitePoint(const size_t offset) const
{
std::vector<u_rational_t> result;
uint32_t rationalOffset = getU32( offset + 8 );
result.push_back( getURational( rationalOffset ) );
result.push_back( getURational( rationalOffset + 8 ) );
return result;
}
/**
* @brief Get YCbCr Coefficients information from raw exif data
* This is internal function and is not exposed to client
* @param [in] offset Offset to entry in bytes inside raw exif data
* @return vector with YCbCr coefficients values
*
*/
std::vector<u_rational_t> ExifReader::getYCbCrCoeffs(const size_t offset) const
{
std::vector<u_rational_t> result;
uint32_t rationalOffset = getU32( offset + 8 );
for( size_t i = 0; i < ycbcrCoeffs; i++ )
{
result.push_back( getURational( rationalOffset ) );
rationalOffset += 8;
}
return result;
}
/**
* @brief Get Primary Chromaticies information from raw exif data
* This is internal function and is not exposed to client
* @param [in] offset Offset to entry in bytes inside raw exif data
* @return vector with primary chromaticies values
*
*/
std::vector<u_rational_t> ExifReader::getPrimaryChromaticies(const size_t offset) const
{
std::vector<u_rational_t> result;
uint32_t rationalOffset = getU32( offset + 8 );
for( size_t i = 0; i < primaryChromaticiesComponents; i++ )
{
result.push_back( getURational( rationalOffset ) );
rationalOffset += 8;
}
return result;
}
/**
* @brief Get Reference Black&White point information from raw exif data
* This is internal function and is not exposed to client
* @param [in] offset Offset to entry in bytes inside raw exif data
* @return vector with reference BW points
*
* In case of YCbCr format, first 2 show black/white of Y, next 2 are Cb,
* last 2 are Cr. In case of RGB format, first 2 show black/white of R,
* next 2 are G, last 2 are B.
*
*/
std::vector<u_rational_t> ExifReader::getRefBW(const size_t offset) const
{
const size_t rationalFieldSize = 8;
std::vector<u_rational_t> result;
uint32_t rationalOffset = getU32( offset + rationalFieldSize );
for( size_t i = 0; i < refBWComponents; i++ )
{
result.push_back( getURational( rationalOffset ) );
rationalOffset += rationalFieldSize;
}
return result;
}
inline URational getValue(const byte* buf, ByteOrder byteOrder)
{
return getURational(buf, byteOrder);
}