Collaboration diagram for osgEarth::ImageLayerTileProcessor:

Public Member Functions
	ImageLayerTileProcessor (const ImageLayerOptions &options=ImageLayerOptions())
void	init (const ImageLayerOptions &options, bool layerInTargetProfile)
void	process (osg::ref_ptr< osg::Image > &image) const
Private Attributes
ImageLayerOptions	_options
osg::Vec4f	_chromaKey
osg::ref_ptr< const osg::Image >	_noDataImage
bool	_layerInTargetProfile

Detailed Description

Internal utility class for post-processing image tiles that come from a TileSource

Definition at line 137 of file ImageLayer.

Constructor & Destructor Documentation

ImageLayerTileProcessor::ImageLayerTileProcessor ( const ImageLayerOptions & options = ImageLayerOptions() )

Definition at line 151 of file ImageLayer.cpp.

{
    init( options, false );
}

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Member Function Documentation

void ImageLayerTileProcessor::init	(	const ImageLayerOptions &	options,
		bool	layerInTargetProfile
	)

Definition at line 157 of file ImageLayer.cpp.

{
    _options = options;
    _layerInTargetProfile = layerInTargetProfile;

    if ( _layerInTargetProfile )
        OE_DEBUG << LC << "Good, the layer and map have the same profile." << std::endl;

    const osg::Vec4ub& ck= *_options.transparentColor();
    _chromaKey.set( ck.r() / 255.0f, ck.g() / 255.0f, ck.b() / 255.0f, 1.0 );

    if ( _options.noDataImageFilename().isSet() && !_options.noDataImageFilename()->empty() )
    {
        _noDataImage = URI(*_options.noDataImageFilename()).readImage();
        if ( !_noDataImage.valid() )
        {
            OE_WARN << "Warning: Could not read nodata image from \"" << _options.noDataImageFilename().value() << "\"" << std::endl;
        }
    }
}

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void ImageLayerTileProcessor::process ( osg::ref_ptr< osg::Image > & image ) const

Definition at line 179 of file ImageLayer.cpp.

{
    if ( !image.valid() )
        return;

    // Check to see if the image is the nodata image
    if ( _noDataImage.valid() )
    {
        if (ImageUtils::areEquivalent(image.get(), _noDataImage.get()))
        {
            //OE_DEBUG << LC << "Found nodata" << std::endl;
            image = 0L;
            return;
        }
    }

    // If this is a compressed image, uncompress it IF the image is not already in the
    // target profile...becuase if it's not in the target profile, we will have to do
    // some mosaicing...and we can't mosaic a compressed image.
    if (!_layerInTargetProfile &&
        ImageUtils::isCompressed(image.get()) &&
        ImageUtils::canConvert(image.get(), GL_RGBA, GL_UNSIGNED_BYTE) )
    {
        image = ImageUtils::convertToRGBA8( image.get() );
    }

    // Apply a transparent color mask if one is specified
    if ( _options.transparentColor().isSet() )
    {
        if ( !ImageUtils::hasAlphaChannel(image.get()) && ImageUtils::canConvert(image.get(), GL_RGBA, GL_UNSIGNED_BYTE) )
        {
            // if the image doesn't have an alpha channel, we must convert it to
            // a format that does before continuing.
            image = ImageUtils::convertToRGBA8( image.get() );
        }           

        ImageUtils::PixelVisitor<ApplyChromaKey> applyChroma;
        applyChroma._chromaKey = _chromaKey;
        applyChroma.accept( image.get() );
    }

    // protected against multi threaded access. This is a requirement in sequential/preemptive mode, 
    // for example. This used to be in TextureCompositorTexArray::prepareImage.
    // TODO: review whether this affects performance.    
    image->setDataVariance( osg::Object::DYNAMIC );
}