osgEarth::Symbology::GeometryRasterizer Class Reference

Collaboration diagram for osgEarth::Symbology::GeometryRasterizer:

List of all members.

Public Member Functions
	GeometryRasterizer (int width, int height, const Style &style=Style())
void	draw (const Geometry *geom, const osg::Vec4f &color=osg::Vec4f(1, 1, 1, 1))
osg::Image *	finalize ()
Private Attributes
osg::ref_ptr< osg::Image >	_image
Style	_style
osg::ref_ptr< osg::Referenced >	_state

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Detailed Description

Draws geometry onto an Image canvas using software path-rendering.

Definition at line 33 of file GeometryRasterizer.

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Constructor & Destructor Documentation

GeometryRasterizer::GeometryRasterizer	(	int	width,
		int	height,
		const Style &	style = Style()
	)

Definition at line 51 of file GeometryRasterizer.cpp.

                                                                                  :
_style( style )
{
    _image = new osg::Image();
    _image->allocateImage( width, height, 1, GL_RGBA, GL_UNSIGNED_BYTE );
    _image->setAllocationMode( osg::Image::USE_NEW_DELETE );
    _state = new AggState( _image.get() );
}

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Member Function Documentation

void GeometryRasterizer::draw	(	const Geometry *	geom,
		const osg::Vec4f &	color = osg::Vec4f(1,1,1,1)
	)

draws the geometry to the image.

Definition at line 76 of file GeometryRasterizer.cpp.

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

    AggState* state = static_cast<AggState*>( _state.get() );

    osg::Vec4f color = c;
    osg::ref_ptr<const Geometry> geomToRender = geom;

    if ( geom->getType() == Geometry::TYPE_POLYGON )
    {
        const PolygonSymbol* ps = _style.getSymbol<const PolygonSymbol>();
        if ( ps )
            color = ps->fill()->color();
    }
    else
    {
        const LineSymbol* ls = _style.getSymbol<const LineSymbol>();
        float distance = ls ? ls->stroke()->width().value() * 0.5f : 1.0f;
        osg::ref_ptr<Geometry> bufferedGeom;
        if ( !geom->buffer( distance, bufferedGeom ) )
        {
            OE_WARN << LC << "Failed to draw line; buffer op not available" << std::endl;
            return;
        }
        geomToRender = bufferedGeom.get();
        if ( ls )
            color = ls->stroke()->color();
    }

    float a = 127+(color.a()*255)/2; // scale alpha up
    agg::rgba8 fgColor = agg::rgba8( (unsigned int)(color.r()*255), (unsigned int)(color.g()*255), (unsigned int)(color.b()*255), (unsigned int)a );

    ConstGeometryIterator gi( geomToRender.get() );
    while( gi.hasMore() )
    {
        const Vec3dVector& g = gi.next()->asVector();

        for( Vec3dVector::const_iterator p = g.begin(); p != g.end(); p++ )
        {
            const osg::Vec3d& p0 = *p;

            if ( p == g.begin() )
                state->_ras.move_to_d( p0.x(), p0.y() );
            else
                state->_ras.line_to_d( p0.x(), p0.y() );
        }
    }
    state->_ras.render( state->_ren, fgColor );
    state->_ras.reset();
}

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osg::Image * GeometryRasterizer::finalize

(

)

finishes the image and returns it. calls to draw() after this will have no effect.

Definition at line 61 of file GeometryRasterizer.cpp.

{
    //convert from ABGR to RGBA
    unsigned char* pixel = _image->data();
    for(int i=0; i<_image->s()*_image->t()*4; i+=4, pixel+=4)
    {
        std::swap( pixel[0], pixel[3] );
        std::swap( pixel[1], pixel[2] );
    }
    osg::Image* result = _image.release();
    _image = 0L;
    return result;
}

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Member Data Documentation

osg::ref_ptr<osg::Image> osgEarth::Symbology::GeometryRasterizer::_image [private]

Definition at line 45 of file GeometryRasterizer.

osg::ref_ptr<osg::Referenced> osgEarth::Symbology::GeometryRasterizer::_state [private]

Definition at line 47 of file GeometryRasterizer.

Style osgEarth::Symbology::GeometryRasterizer::_style [private]

Definition at line 46 of file GeometryRasterizer.

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The documentation for this class was generated from the following files:

• /home/cube/sources/osgearth/src/osgEarthSymbology/GeometryRasterizer
• /home/cube/sources/osgearth/src/osgEarthSymbology/GeometryRasterizer.cpp