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Add custom layer property to render a layer over labels in the map canvas

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Usage:

layer.setCustomProperty('rendering/renderAboveLabels', True)

This is exposed only as a layer custom property since it's really just
exposing some private internals of the rendering map composition. It's
not supported outside of canvas, and only works when parallel rendering
with render cache is enabled.

It's not exposed anywhere in GUI for this same reason. Consider it a
hidden API call until someone implements proper handling of mixed
layer/label stacking order.
This commit is contained in:
Nyall Dawson 2017-02-13 10:02:40 +10:00
parent e025b58bfc
commit e740890cf6
1 changed files with 20 additions and 0 deletions
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20
src/core/qgsmaprendererjob.cpp
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@ -457,10 +457,14 @@ QImage QgsMapRendererJob::composeImage( const QgsMapSettings& settings, const La
QPainter painter( &image );
for ( LayerRenderJobs::const_iterator it = jobs.constBegin(); it != jobs.constEnd(); ++it )
{
const LayerRenderJob& job = *it;
if ( job.layer && job.layer->customProperty( QStringLiteral( "rendering/renderAboveLabels" ) ).toBool() )
continue; // skip layer for now, it will be rendered after labels
painter.setCompositionMode( job.blendMode );
painter.setOpacity( job.opacity );
@ -479,6 +483,22 @@ QImage QgsMapRendererJob::composeImage( const QgsMapSettings& settings, const La
painter.drawImage( 0, 0, *labelJob.img );
}
// render any layers with the renderAboveLabels flag now
for ( LayerRenderJobs::const_iterator it = jobs.constBegin(); it != jobs.constEnd(); ++it )
{
const LayerRenderJob& job = *it;
if ( !job.layer || !job.layer->customProperty( QStringLiteral( "rendering/renderAboveLabels" ) ).toBool() )
continue;
painter.setCompositionMode( job.blendMode );
painter.setOpacity( job.opacity );
Q_ASSERT( job.img );
painter.drawImage( 0, 0, *job.img );
}
painter.end();
return image;
}