29 , mLayerOpacity( layer->opacity() )
31 const QList< QgsMapLayer * > layers = layer->
childLayers();
43 context.
setExtent( extentInChildLayerCrs );
47 QgsDebugError( QStringLiteral(
"Error transforming extent of %1 to destination CRS" ).arg( childLayer->id() ) );
51 mChildRenderers.emplace_back( childLayer->createMapRenderer( context ) );
52 mRendererCompositionModes.emplace_back( childLayer->blendMode() );
54 mTransforms.emplace_back( layerToDestTransform );
59 mForceRasterRender = layer->
blendMode() != QPainter::CompositionMode_SourceOver;
66 return mFeedback.get();
76 mPaintEffect->begin( context );
80 bool canceled =
false;
82 for (
const std::unique_ptr< QgsMapLayerRenderer > &renderer : std::as_const( mChildRenderers ) )
84 if ( mFeedback->isCanceled() )
94 context.
setExtent( extentInChildLayerCrs );
98 context.
painter()->setCompositionMode( mRendererCompositionModes[i] );
100 QPainter *prevPainter = context.
painter();
101 std::unique_ptr< QPainter > imagePainter;
102 if ( renderer->forceRasterRender() )
105 image.setDevicePixelRatio(
static_cast<qreal
>( context.
devicePixelRatio() ) );
107 imagePainter = std::make_unique< QPainter >( &image );
119 context.
painter()->setOpacity( mRendererOpacity[i] );
120 context.
painter()->drawImage( 0, 0, image );
121 context.
painter()->setOpacity( 1.0 );
123 context.
painter()->setCompositionMode( QPainter::CompositionMode_SourceOver );
129 mPaintEffect->end( context );
142 if ( mForceRasterRender || !
qgsDoubleNear( mLayerOpacity, 1.0 ) )
145 for ( QPainter::CompositionMode mode : mRendererCompositionModes )
147 if ( mode != QPainter::CompositionMode_SourceOver )
@ UseAdvancedEffects
Enable layer opacity and blending effects.
@ Reverse
Reverse/inverse transform (from destination to source)
This class represents a coordinate reference system (CRS).
Custom exception class for Coordinate Reference System related exceptions.
Base class for feedback objects to be used for cancellation of something running in a worker thread.
~QgsGroupLayerRenderer() override
QgsGroupLayerRenderer(QgsGroupLayer *layer, QgsRenderContext &context)
Constructor for a QgsGroupLayerRenderer, for the specified layer.
bool forceRasterRender() const override
Returns true if the renderer must be rendered to a raster paint device (e.g.
QgsFeedback * feedback() const override
Access to feedback object of the layer renderer (may be nullptr)
bool render() override
Do the rendering (based on data stored in the class).
A map layer which consists of a set of child layers, where all component layers are rendered as a sin...
QgsPaintEffect * paintEffect() const
Returns the current paint effect for the group layer.
QList< QgsMapLayer * > childLayers() const
Returns the child layers contained by the group.
Base class for utility classes that encapsulate information necessary for rendering of map layers.
QgsRenderContext * renderContext()
Returns the render context associated with the renderer.
Base class for all map layer types.
QPainter::CompositionMode blendMode() const
Returns the current blending mode for a layer.
bool enabled() const
Returns whether the effect is enabled.
virtual QgsPaintEffect * clone() const =0
Duplicates an effect by creating a deep copy of the effect.
A rectangle specified with double values.
Contains information about the context of a rendering operation.
void setCoordinateTransform(const QgsCoordinateTransform &t)
Sets the current coordinate transform for the context.
bool useAdvancedEffects() const
Returns true if advanced effects such as blend modes such be used.
QPainter * painter()
Returns the destination QPainter for the render operation.
void setPainterFlagsUsingContext(QPainter *painter=nullptr) const
Sets relevant flags on a destination painter, using the flags and settings currently defined for the ...
QgsCoordinateTransformContext transformContext() const
Returns the context's coordinate transform context, which stores various information regarding which ...
float devicePixelRatio() const
Returns the device pixel ratio.
QgsRectangle mapExtent() const
Returns the original extent of the map being rendered.
void setExtent(const QgsRectangle &extent)
When rendering a map layer, calling this method sets the "clipping" extent for the layer (in the laye...
void setPainter(QPainter *p)
Sets the destination QPainter for the render operation.
QSize deviceOutputSize() const
Returns the device output size of the render.
QgsCoordinateTransform coordinateTransform() const
Returns the current coordinate transform for the context.
QImage::Format imageFormat() const
Returns the QImage format which should be used for QImages created during rendering.
bool qgsDoubleNear(double a, double b, double epsilon=4 *std::numeric_limits< double >::epsilon())
Compare two doubles (but allow some difference)
#define QgsDebugError(str)