Add transform context to raster file writer task

python/core/auto_generated/raster/qgsrasterfilewritertask.sip.in

@@ -28,15 +28,34 @@ QGIS interface.
 %End
   public:
 
+ QgsRasterFileWriterTask( const QgsRasterFileWriter &writer, QgsRasterPipe *pipe /Transfer/,
+        int columns, int rows,
+        const QgsRectangle &outputExtent,
+        const QgsCoordinateReferenceSystem &crs ) /Deprecated/;
+%Docstring
+Constructor for QgsRasterFileWriterTask. Takes a source ``writer``,
+``columns``, ``rows``, ``outputExtent`` and destination ``crs``.
+Ownership of the ``pipe`` is transferred to the writer task, and will
+be deleted when the task completes.
+
+.. deprecated:: since QGIS 3.8, use version with transformContext instead
+%End
+
+
     QgsRasterFileWriterTask( const QgsRasterFileWriter &writer, QgsRasterPipe *pipe /Transfer/,
                              int columns, int rows,
                              const QgsRectangle &outputExtent,
-                             const QgsCoordinateReferenceSystem &crs );
+                             const QgsCoordinateReferenceSystem &crs,
+                             const QgsCoordinateTransformContext &transformContext
+                           );
 %Docstring
 Constructor for QgsRasterFileWriterTask. Takes a source ``writer``,
-``columns``, ``rows``, ``outputExtent`` and destination ``crs``.
+``columns``, ``rows``, ``outputExtent``, destination ``crs`` and
+coordinate ``transformContext`` .
 Ownership of the ``pipe`` is transferred to the writer task, and will
 be deleted when the task completes.
+
+.. deprecated:: since QGIS 3.8, use version with transformContext instead
 %End
 
     virtual void cancel();

src/app/qgisapp.cpp

@@ -7595,7 +7595,7 @@ QString QgisApp::saveAsRasterFile( QgsRasterLayer *rasterLayer, const bool defau
   QString outputFormat = d.outputFormat();
 
   QgsRasterFileWriterTask *writerTask = new QgsRasterFileWriterTask( fileWriter, pipe.release(), d.nColumns(), d.nRows(),
-      d.outputRectangle(), QgsProject::instance()->transformContext(), d.outputCrs() );
+      d.outputRectangle(), d.outputCrs(), QgsProject::instance()->transformContext() );
 
   // when writer is successful:
 

src/core/raster/qgsrasterfilewritertask.cpp

@@ -17,11 +17,20 @@
 
 #include "qgsrasterfilewritertask.h"
 #include "qgsrasterinterface.h"
+#include "qgsrasterdataprovider.h"
 
-QgsRasterFileWriterTask::QgsRasterFileWriterTask( const QgsRasterFileWriter &writer, QgsRasterPipe *pipe,
-    int columns, int rows,
+// Deprecated!
+QgsRasterFileWriterTask::QgsRasterFileWriterTask( const QgsRasterFileWriter &writer, QgsRasterPipe *pipe, int columns, int rows,
+    const QgsRectangle &outputExtent, const QgsCoordinateReferenceSystem &crs )
+  : QgsRasterFileWriterTask( writer, pipe, columns, rows, outputExtent, crs,
+                             ( pipe && pipe->provider() ) ? pipe->provider()->transformContext() : QgsCoordinateTransformContext() )
+{
+}
+
+QgsRasterFileWriterTask::QgsRasterFileWriterTask( const QgsRasterFileWriter &writer, QgsRasterPipe *pipe, int columns, int rows,
     const QgsRectangle &outputExtent,
-    const QgsCoordinateReferenceSystem &crs )
+    const QgsCoordinateReferenceSystem &crs,
+    const QgsCoordinateTransformContext &transformContext )
   : QgsTask( tr( "Saving %1" ).arg( writer.outputUrl() ), QgsTask::CanCancel )
   , mWriter( writer )
   , mRows( rows )
@@ -30,7 +39,9 @@ QgsRasterFileWriterTask::QgsRasterFileWriterTask( const QgsRasterFileWriter &wri
   , mCrs( crs )
   , mPipe( pipe )
   , mFeedback( new QgsRasterBlockFeedback() )
-{}
+  , mTransformContext( transformContext )
+{
+}
 
 void QgsRasterFileWriterTask::cancel()
 {
@@ -45,7 +56,7 @@ bool QgsRasterFileWriterTask::run()
 
   connect( mFeedback.get(), &QgsRasterBlockFeedback::progressChanged, this, &QgsRasterFileWriterTask::setProgress );
 
-  mError = mWriter.writeRaster( mPipe.get(), mColumns, mRows, mExtent, mCrs, mFeedback.get() );
+  mError = mWriter.writeRaster( mPipe.get(), mColumns, mRows, mExtent, mCrs, mTransformContext, mFeedback.get() );
 
   return mError == QgsRasterFileWriter::NoError;
 }

src/core/raster/qgsrasterfilewritertask.h

@@ -21,6 +21,7 @@
 #include "qgis_core.h"
 #include "qgstaskmanager.h"
 #include "qgsrasterfilewriter.h"
+#include "qgscoordinatetransformcontext.h"
 #include "qgsrasterinterface.h"
 #include "qgsrasterpipe.h"
 
@@ -45,11 +46,28 @@ class CORE_EXPORT QgsRasterFileWriterTask : public QgsTask
      * \a columns, \a rows, \a outputExtent and destination \a crs.
      * Ownership of the \a pipe is transferred to the writer task, and will
      * be deleted when the task completes.
+     * \deprecated since QGIS 3.8, use version with transformContext instead
+     */
+    Q_DECL_DEPRECATED QgsRasterFileWriterTask( const QgsRasterFileWriter &writer, QgsRasterPipe *pipe SIP_TRANSFER,
+        int columns, int rows,
+        const QgsRectangle &outputExtent,
+        const QgsCoordinateReferenceSystem &crs ) SIP_DEPRECATED;
+
+
+    /**
+     * Constructor for QgsRasterFileWriterTask. Takes a source \a writer,
+     * \a columns, \a rows, \a outputExtent, destination \a crs and
+     * coordinate \a transformContext .
+     * Ownership of the \a pipe is transferred to the writer task, and will
+     * be deleted when the task completes.
+     * \deprecated since QGIS 3.8, use version with transformContext instead
      */
     QgsRasterFileWriterTask( const QgsRasterFileWriter &writer, QgsRasterPipe *pipe SIP_TRANSFER,
                              int columns, int rows,
                              const QgsRectangle &outputExtent,
-                             const QgsCoordinateReferenceSystem &crs );
+                             const QgsCoordinateReferenceSystem &crs,
+                             const QgsCoordinateTransformContext &transformContext
+                           );
 
     void cancel() override;
 
@@ -87,6 +105,8 @@ class CORE_EXPORT QgsRasterFileWriterTask : public QgsTask
 
     QgsRasterFileWriter::WriterError mError = QgsRasterFileWriter::NoError;
 
+    QgsCoordinateTransformContext mTransformContext;
+
 };
 
 #endif //QGSRASTERFILEWRITERTASK_H

tests/src/python/test_qgsrasterfilewritertask.py

@@ -17,6 +17,7 @@
 
 from qgis.core import (
     QgsApplication,
+    QgsCoordinateTransformContext,
     QgsRasterLayer,
     QgsRasterPipe,
     QgsRasterFileWriter,
@@ -57,7 +58,7 @@ def testSuccess(self):
         tmp = create_temp_filename('success.tif')
         writer = QgsRasterFileWriter(tmp)
 
-        task = QgsRasterFileWriterTask(writer, pipe, 100, 100, raster_layer.extent(), raster_layer.crs())
+        task = QgsRasterFileWriterTask(writer, pipe, 100, 100, raster_layer.extent(), raster_layer.crs(), QgsCoordinateTransformContext())
 
         task.writeComplete.connect(self.onSuccess)
         task.errorOccurred.connect(self.onFail)
@@ -82,7 +83,7 @@ def testLayerRemovalBeforeRun(self):
         tmp = create_temp_filename('remove_layer.tif')
         writer = QgsRasterFileWriter(tmp)
 
-        task = QgsRasterFileWriterTask(writer, pipe, 100, 100, raster_layer.extent(), raster_layer.crs())
+        task = QgsRasterFileWriterTask(writer, pipe, 100, 100, raster_layer.extent(), raster_layer.crs(), QgsCoordinateTransformContext())
 
         task.writeComplete.connect(self.onSuccess)
         task.errorOccurred.connect(self.onFail)