Public Types
typedef osg::Vec4(*	ReaderFunc )(const PixelReader *ia, int s, int t, int r, int m)
Public Member Functions
	PixelReader (const osg::Image *image)
osg::Vec4	operator() (int s, int t, int r=0, int m=0) const
const unsigned char *	data (int s=0, int t=0, int r=0, int m=0) const
Static Public Member Functions
static bool	supports (GLenum pixelFormat, GLenum dataType)
static bool	supports (const osg::Image *image)
Public Attributes
ReaderFunc	_reader
const osg::Image *	_image
unsigned	_colMult
unsigned	_rowMult
unsigned	_imageSize

Detailed Description

Reads color data out of an image, regardles of its internal pixel format.

Definition at line 202 of file ImageUtils.

Member Typedef Documentation

typedef osg::Vec4(* osgEarth::ImageUtils::PixelReader::ReaderFunc)(const PixelReader *ia, int s, int t, int r, int m)

Definition at line 227 of file ImageUtils.

Constructor & Destructor Documentation

ImageUtils::PixelReader::PixelReader ( const osg::Image * image )

Definition at line 941 of file ImageUtils.cpp.

                                                        :
_image(image)
{
    _colMult = _image->getPixelSizeInBits() / 8;
    _rowMult = _image->getRowSizeInBytes();
    _imageSize = _image->getImageSizeInBytes();
    GLenum dataType = _image->getDataType();
    _reader = getReader( _image->getPixelFormat(), dataType );
    if ( !_reader )
    {
        OE_WARN << "[PixelReader] No reader found for pixel format " << std::hex << _image->getPixelFormat() << std::endl; 
        _reader = &ColorReader<0,GLbyte>::read;
    }
}

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Member Function Documentation

const unsigned char* osgEarth::ImageUtils::PixelReader::data	(	int	s = `0`,
		int	t = `0`,
		int	r = `0`,
		int	m = `0`
	)		const `[inline]`

Definition at line 221 of file ImageUtils.

                                                                                {
                return m == 0 ?
                    _image->data() + s*_colMult + t*_rowMult + r*_imageSize :
                    _image->getMipmapData(m) + s*_colMult + t*(_rowMult >> m) + r*(_imageSize>>m) ;
            }

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osg::Vec4 osgEarth::ImageUtils::PixelReader::operator()	(	int	s,
		int	t,
		int	r = `0`,
		int	m = `0`
	)		const `[inline]`

Reads a color from the image

Definition at line 216 of file ImageUtils.

                                                                     {
                return (*_reader)(this, s, t, r, m);
            }

bool ImageUtils::PixelReader::supports	(	GLenum	pixelFormat,
		GLenum	dataType
	)		`[static]`

Whether PixelReader supports a given format/datatype combiniation.

Definition at line 957 of file ImageUtils.cpp.

{
    return getReader(pixelFormat, dataType) != 0L;
}

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static bool osgEarth::ImageUtils::PixelReader::supports ( const osg::Image * image ) [inline, static]

Whether PixelReader can read from the specified image.

Definition at line 211 of file ImageUtils.

                                                          {
                return image && supports(image->getPixelFormat(), image->getDataType() );
            }