Restrict available formats when running algorithms to those supported

by the provider

python/plugins/processing/gui/ParameterGuiUtils.py

@@ -63,13 +63,11 @@ def getFileFilter(param):
         for i in range(len(exts)):
             exts[i] = tr('{0} files (*.{1})', 'QgsProcessingParameterRasterDestination').format(exts[i].upper(), exts[i].lower())
         return ';;'.join(exts) + ';;' + tr('All files (*.*)')
-    elif param.type() == 'table':
-        exts = ['csv', 'dbf']
-        for i in range(len(exts)):
-            exts[i] = tr('{0} files (*.{1})', 'ParameterTable').format(exts[i].upper(), exts[i].lower())
-        return tr('All files (*.*)') + ';;' + ';;'.join(exts)
-    elif param.type() == 'sink':
-        exts = QgsVectorFileWriter.supportedFormatExtensions()
+    elif param.type() in ('sink', 'vectorDestination'):
+        if param.provider() is not None:
+            exts = param.provider().supportedOutputVectorLayerExtensions()
+        else:
+            exts = QgsVectorFileWriter.supportedFormatExtensions()
         for i in range(len(exts)):
             exts[i] = tr('{0} files (*.{1})', 'ParameterVector').format(exts[i].upper(), exts[i].lower())
         return ';;'.join(exts) + ';;' + tr('All files (*.*)')

src/core/processing/qgsprocessingprovider.cpp

@@ -45,6 +45,11 @@ QString QgsProcessingProvider::longName() const
   return name();
 }
 
+QStringList QgsProcessingProvider::supportedOutputRasterLayerExtensions() const
+{
+  return QStringList() << QStringLiteral( "tif" );
+}
+
 void QgsProcessingProvider::refreshAlgorithms()
 {
   qDeleteAll( mAlgorithms );

src/core/processing/qgsprocessingprovider.h

@@ -106,7 +106,7 @@ class CORE_EXPORT QgsProcessingProvider : public QObject
      * \see supportedOutputVectorLayerExtensions()
      * \see supportedOutputTableExtensions()
      */
-    virtual QStringList supportedOutputRasterLayerExtensions() const { return QStringList() << QStringLiteral( "tif" ); }
+    virtual QStringList supportedOutputRasterLayerExtensions() const;
 
     /**
      * Returns a list of the vector format file extensions supported by this provider.