Images FrameData::startReadback( const Frame& frame,
util::ObjectManager& glObjects,
const DrawableConfig& config,
const PixelViewports& regions )
{
if( _impl->data.buffers == Frame::BUFFER_NONE )
return Images();
const Zoom& zoom = frame.getZoom();
if( !zoom.isValid( ))
{
LBWARN << "Invalid zoom factor, skipping frame" << std::endl;
return Images();
}
const eq::PixelViewport& framePVP = getPixelViewport();
const PixelViewport absPVP = framePVP + frame.getOffset();
if( !absPVP.isValid( ))
return Images();
Images images;
// readback the whole screen when using textures
if( getType() == eq::Frame::TYPE_TEXTURE )
{
Image* image = newImage( getType(), config );
if( image->startReadback( getBuffers(), absPVP, zoom, glObjects ))
images.push_back( image );
image->setOffset( 0, 0 );
return images;
}
//else read only required regions
#if 0
// TODO: issue #85: move automatic ROI detection to eq::Channel
PixelViewports regions;
if( _impl->data.buffers & Frame::BUFFER_DEPTH && zoom == Zoom::NONE )
regions = _impl->roiFinder->findRegions( _impl->data.buffers, absPVP,
zoom, frame.getAssemblyStage(),
frame.getFrameID(), glObjects);
else
regions.push_back( absPVP );
#endif
LBASSERT( getType() == eq::Frame::TYPE_MEMORY );
const eq::Pixel& pixel = getPixel();
for( uint32_t i = 0; i < regions.size(); ++i )
{
PixelViewport pvp = regions[ i ] + frame.getOffset();
pvp.intersect( absPVP );
if( !pvp.hasArea( ))
continue;
Image* image = newImage( getType(), config );
if( image->startReadback( getBuffers(), pvp, zoom, glObjects ))
images.push_back( image );
pvp -= frame.getOffset();
pvp.apply( zoom );
image->setOffset( (pvp.x - framePVP.x) * pixel.w,
(pvp.y - framePVP.y) * pixel.h );
}
return images;
}
bool ROITracker::useROIFinder( const PixelViewport& pvp,
const uint32_t stage,
const uint128_t& frameID,
uint8_t*& ticket )
{
LBASSERT( !_needsUpdate );
ticket = 0;
const uint32_t pvpArea = pvp.getArea();
if( pvpArea < 100 )
return false;
if( _lastFrameID != frameID ) // new frame
{
stde::hash_map< uint32_t, Stage >* tmp = _prvFrame;
_prvFrame = _curFrame;
_curFrame = tmp;
_curFrame->clear();
_lastFrameID = frameID;
}
_lastStage = stage;
Stage& curStage = (*_curFrame)[ stage ];
// check if proper stage is avaliable
if( _prvFrame->find( stage ) == _prvFrame->end( )) // new stage
{
curStage.areas.push_back( Area( pvp ));
return _returnPositive( ticket );
}
//else existing stage, try to find matching area
const Area* match = 0;
uint32_t bestArea = 0;
const Stage& prvStage = (*_prvFrame)[ stage ];
for( uint32_t i = 0; i < prvStage.areas.size(); i++ )
{
PixelViewport tmp = prvStage.areas[i].pvp;
tmp.intersect( pvp );
const uint32_t area = tmp.getArea();
if( area > bestArea )
{
bestArea = area;
match = &prvStage.areas[i];
if( area == pvpArea ) // full match
break;
}
}
if( bestArea < pvpArea*2/3 ) // no proper match found, new area
{
curStage.areas.push_back( Area( pvp ));
return _returnPositive( ticket );
}
// else good match
if( match->skip == 0 ) // don't skip frame
{
curStage.areas.push_back( Area( pvp, match->lastSkip ));
return _returnPositive( ticket );
}
//else skip frame
curStage.areas.push_back( Area( pvp, match->lastSkip, match->skip-1 ));
return false;
}
