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Initial support for rendering of rasters
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| Original file line number | Diff line number | Diff line change |
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| #include "qgsrasterlayerrenderer.h" | ||
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| #include "qgsmessagelog.h" | ||
| #include "qgsrasterdrawer.h" | ||
| #include "qgsrasteriterator.h" | ||
| #include "qgsrasterlayer.h" | ||
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| QgsRasterLayerRenderer::QgsRasterLayerRenderer( QgsRasterLayer* layer, QgsRenderContext& rendererContext ) | ||
| : mRasterViewPort( 0 ) | ||
| , mPipe( 0 ) | ||
| { | ||
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| mPainter = rendererContext.painter(); | ||
| const QgsMapToPixel& theQgsMapToPixel = rendererContext.mapToPixel(); | ||
| mMapToPixel = &theQgsMapToPixel; | ||
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| QgsRectangle myProjectedViewExtent; | ||
| QgsRectangle myProjectedLayerExtent; | ||
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| if ( rendererContext.coordinateTransform() ) | ||
| { | ||
| QgsDebugMsg( "coordinateTransform set -> project extents." ); | ||
| try | ||
| { | ||
| myProjectedViewExtent = rendererContext.coordinateTransform()->transformBoundingBox( rendererContext.extent() ); | ||
| } | ||
| catch ( QgsCsException &cs ) | ||
| { | ||
| QgsMessageLog::logMessage( QObject::tr( "Could not reproject view extent: %1" ).arg( cs.what() ), QObject::tr( "Raster" ) ); | ||
| myProjectedViewExtent.setMinimal(); | ||
| } | ||
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| try | ||
| { | ||
| myProjectedLayerExtent = rendererContext.coordinateTransform()->transformBoundingBox( layer->extent() ); | ||
| } | ||
| catch ( QgsCsException &cs ) | ||
| { | ||
| QgsMessageLog::logMessage( QObject::tr( "Could not reproject layer extent: %1" ).arg( cs.what() ), QObject::tr( "Raster" ) ); | ||
| myProjectedViewExtent.setMinimal(); | ||
| } | ||
| } | ||
| else | ||
| { | ||
| QgsDebugMsg( "coordinateTransform not set" ); | ||
| myProjectedViewExtent = rendererContext.extent(); | ||
| myProjectedLayerExtent = layer->extent(); | ||
| } | ||
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| // clip raster extent to view extent | ||
| QgsRectangle myRasterExtent = myProjectedViewExtent.intersect( &myProjectedLayerExtent ); | ||
| if ( myRasterExtent.isEmpty() ) | ||
| { | ||
| QgsDebugMsg( "draw request outside view extent." ); | ||
| // nothing to do | ||
| return; | ||
| } | ||
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| QgsDebugMsg( "theViewExtent is " + rendererContext.extent().toString() ); | ||
| QgsDebugMsg( "myProjectedViewExtent is " + myProjectedViewExtent.toString() ); | ||
| QgsDebugMsg( "myProjectedLayerExtent is " + myProjectedLayerExtent.toString() ); | ||
| QgsDebugMsg( "myRasterExtent is " + myRasterExtent.toString() ); | ||
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| // | ||
| // The first thing we do is set up the QgsRasterViewPort. This struct stores all the settings | ||
| // relating to the size (in pixels and coordinate system units) of the raster part that is | ||
| // in view in the map window. It also stores the origin. | ||
| // | ||
| //this is not a class level member because every time the user pans or zooms | ||
| //the contents of the rasterViewPort will change | ||
| mRasterViewPort = new QgsRasterViewPort(); | ||
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| mRasterViewPort->mDrawnExtent = myRasterExtent; | ||
| if ( rendererContext.coordinateTransform() ) | ||
| { | ||
| mRasterViewPort->mSrcCRS = layer->crs(); | ||
| mRasterViewPort->mDestCRS = rendererContext.coordinateTransform()->destCRS(); | ||
| } | ||
| else | ||
| { | ||
| mRasterViewPort->mSrcCRS = QgsCoordinateReferenceSystem(); // will be invalid | ||
| mRasterViewPort->mDestCRS = QgsCoordinateReferenceSystem(); // will be invalid | ||
| } | ||
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| // get dimensions of clipped raster image in device coordinate space (this is the size of the viewport) | ||
| mRasterViewPort->mTopLeftPoint = theQgsMapToPixel.transform( myRasterExtent.xMinimum(), myRasterExtent.yMaximum() ); | ||
| mRasterViewPort->mBottomRightPoint = theQgsMapToPixel.transform( myRasterExtent.xMaximum(), myRasterExtent.yMinimum() ); | ||
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| // align to output device grid, i.e. floor/ceil to integers | ||
| // TODO: this should only be done if paint device is raster - screen, image | ||
| // for other devices (pdf) it can have floating point origin | ||
| // we could use floating point for raster devices as well, but respecting the | ||
| // output device grid should make it more effective as the resampling is done in | ||
| // the provider anyway | ||
| mRasterViewPort->mTopLeftPoint.setX( floor( mRasterViewPort->mTopLeftPoint.x() ) ); | ||
| mRasterViewPort->mTopLeftPoint.setY( floor( mRasterViewPort->mTopLeftPoint.y() ) ); | ||
| mRasterViewPort->mBottomRightPoint.setX( ceil( mRasterViewPort->mBottomRightPoint.x() ) ); | ||
| mRasterViewPort->mBottomRightPoint.setY( ceil( mRasterViewPort->mBottomRightPoint.y() ) ); | ||
| // recalc myRasterExtent to aligned values | ||
| myRasterExtent.set( | ||
| theQgsMapToPixel.toMapCoordinatesF( mRasterViewPort->mTopLeftPoint.x(), | ||
| mRasterViewPort->mBottomRightPoint.y() ), | ||
| theQgsMapToPixel.toMapCoordinatesF( mRasterViewPort->mBottomRightPoint.x(), | ||
| mRasterViewPort->mTopLeftPoint.y() ) | ||
| ); | ||
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| //raster viewport top left / bottom right are already rounded to int | ||
| mRasterViewPort->mWidth = static_cast<int>( mRasterViewPort->mBottomRightPoint.x() - mRasterViewPort->mTopLeftPoint.x() ); | ||
| mRasterViewPort->mHeight = static_cast<int>( mRasterViewPort->mBottomRightPoint.y() - mRasterViewPort->mTopLeftPoint.y() ); | ||
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| //the drawable area can start to get very very large when you get down displaying 2x2 or smaller, this is becasue | ||
| //theQgsMapToPixel.mapUnitsPerPixel() is less then 1, | ||
| //so we will just get the pixel data and then render these special cases differently in paintImageToCanvas() | ||
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| QgsDebugMsgLevel( QString( "mapUnitsPerPixel = %1" ).arg( theQgsMapToPixel.mapUnitsPerPixel() ), 3 ); | ||
| QgsDebugMsgLevel( QString( "mWidth = %1" ).arg( layer->width() ), 3 ); | ||
| QgsDebugMsgLevel( QString( "mHeight = %1" ).arg( layer->height() ), 3 ); | ||
| QgsDebugMsgLevel( QString( "myRasterExtent.xMinimum() = %1" ).arg( myRasterExtent.xMinimum() ), 3 ); | ||
| QgsDebugMsgLevel( QString( "myRasterExtent.xMaximum() = %1" ).arg( myRasterExtent.xMaximum() ), 3 ); | ||
| QgsDebugMsgLevel( QString( "myRasterExtent.yMinimum() = %1" ).arg( myRasterExtent.yMinimum() ), 3 ); | ||
| QgsDebugMsgLevel( QString( "myRasterExtent.yMaximum() = %1" ).arg( myRasterExtent.yMaximum() ), 3 ); | ||
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| QgsDebugMsgLevel( QString( "mTopLeftPoint.x() = %1" ).arg( mRasterViewPort->mTopLeftPoint.x() ), 3 ); | ||
| QgsDebugMsgLevel( QString( "mBottomRightPoint.x() = %1" ).arg( mRasterViewPort->mBottomRightPoint.x() ), 3 ); | ||
| QgsDebugMsgLevel( QString( "mTopLeftPoint.y() = %1" ).arg( mRasterViewPort->mTopLeftPoint.y() ), 3 ); | ||
| QgsDebugMsgLevel( QString( "mBottomRightPoint.y() = %1" ).arg( mRasterViewPort->mBottomRightPoint.y() ), 3 ); | ||
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| QgsDebugMsgLevel( QString( "mWidth = %1" ).arg( mRasterViewPort->mWidth ), 3 ); | ||
| QgsDebugMsgLevel( QString( "mHeight = %1" ).arg( mRasterViewPort->mHeight ), 3 ); | ||
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| // /\/\/\ - added to handle zoomed-in rasters | ||
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| // TODO R->mLastViewPort = *mRasterViewPort; | ||
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| // TODO: is it necessary? Probably WMS only? | ||
| layer->dataProvider()->setDpi( rendererContext.rasterScaleFactor() * 25.4 * rendererContext.scaleFactor() ); | ||
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| // copy the whole raster pipe! | ||
| mPipe = new QgsRasterPipe( *layer->pipe() ); | ||
| } | ||
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| QgsRasterLayerRenderer::~QgsRasterLayerRenderer() | ||
| { | ||
| delete mRasterViewPort; | ||
| delete mPipe; | ||
| } | ||
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| bool QgsRasterLayerRenderer::render() | ||
| { | ||
| if ( !mRasterViewPort ) | ||
| return true; // outside of layer extent - nothing to do | ||
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| //R->draw( mPainter, mRasterViewPort, &mMapToPixel ); | ||
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| QTime time; | ||
| time.start(); | ||
| // | ||
| // | ||
| // The goal here is to make as many decisions as possible early on (outside of the rendering loop) | ||
| // so that we can maximise performance of the rendering process. So now we check which drawing | ||
| // procedure to use : | ||
| // | ||
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| QgsRasterProjector *projector = mPipe->projector(); | ||
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| // TODO add a method to interface to get provider and get provider | ||
| // params in QgsRasterProjector | ||
| if ( projector ) | ||
| { | ||
| projector->setCRS( mRasterViewPort->mSrcCRS, mRasterViewPort->mDestCRS ); | ||
| } | ||
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| // Drawer to pipe? | ||
| QgsRasterIterator iterator( mPipe->last() ); | ||
| QgsRasterDrawer drawer( &iterator ); | ||
| drawer.draw( mPainter, mRasterViewPort, mMapToPixel ); | ||
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| QgsDebugMsg( QString( "total raster draw time (ms): %1" ).arg( time.elapsed(), 5 ) ); | ||
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| return true; | ||
| } |
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