[processing] fix handling of the mask layer in the gdal_sieve algorithm

(fix #20713)

(cherry picked from commit a5365e2)

Author: alexbruy

python/plugins/processing/algs/gdal/sieve.py

@@ -104,7 +104,7 @@ def getConsoleCommands(self, parameters, context, feedback, executing=True):
         if self.parameterAsBool(parameters, self.NO_MASK, context):
             arguments.append('-nomask')
 
-        mask = self.parameterAsRasterLayer(parameters, self.INPUT, context)
+        mask = self.parameterAsRasterLayer(parameters, self.MASK_LAYER, context)
         if mask:
             arguments.append('-mask {}'.format(mask.source()))
 

python/plugins/processing/tests/GdalAlgorithmsTest.py

@@ -60,6 +60,7 @@
 from processing.algs.gdal.fillnodata import fillnodata
 from processing.algs.gdal.rearrange_bands import rearrange_bands
 from processing.algs.gdal.gdaladdo import gdaladdo
+from processing.algs.gdal.sieve import sieve
 
 from processing.tools.system import isWindows
 
@@ -2448,6 +2449,71 @@ def testGdalAddo(self):
                 ['gdaladdo',
                  source + ' ' + '-r nearest 2 4 8 16'])
 
+    def testSieve(self):
+        context = QgsProcessingContext()
+        feedback = QgsProcessingFeedback()
+        source = os.path.join(testDataPath, 'dem.tif')
+        mask = os.path.join(testDataPath, 'raster.tif')
+
+        with tempfile.TemporaryDirectory() as outdir:
+            outsource = outdir + '/check.tif'
+            alg = sieve()
+            alg.initAlgorithm()
+
+            # defaults
+            self.assertEqual(
+                alg.getConsoleCommands({'INPUT': source,
+                                        'THRESHOLD': 10,
+                                        'EIGHT_CONNECTEDNESS': False,
+                                        'NO_MASK': False,
+                                        'MASK_LAYER': None,
+                                        'OUTPUT': outsource}, context, feedback),
+                ['gdal_sieve.py',
+                 '-st 10 -4 -of GTiff ' +
+                 source + ' ' +
+                 outsource])
+
+            # Eight connectedness and custom threshold
+            self.assertEqual(
+                alg.getConsoleCommands({'INPUT': source,
+                                        'THRESHOLD': 16,
+                                        'EIGHT_CONNECTEDNESS': True,
+                                        'NO_MASK': False,
+                                        'MASK_LAYER': None,
+                                        'OUTPUT': outsource}, context, feedback),
+                ['gdal_sieve.py',
+                 '-st 16 -8 -of GTiff ' +
+                 source + ' ' +
+                 outsource])
+
+            # without default mask layer
+            self.assertEqual(
+                alg.getConsoleCommands({'INPUT': source,
+                                        'THRESHOLD': 10,
+                                        'EIGHT_CONNECTEDNESS': False,
+                                        'NO_MASK': True,
+                                        'MASK_LAYER': None,
+                                        'OUTPUT': outsource}, context, feedback),
+                ['gdal_sieve.py',
+                 '-st 10 -4 -nomask -of GTiff ' +
+                 source + ' ' +
+                 outsource])
+
+            # defaults with external validity mask
+            self.assertEqual(
+                alg.getConsoleCommands({'INPUT': source,
+                                        'THRESHOLD': 10,
+                                        'EIGHT_CONNECTEDNESS': False,
+                                        'NO_MASK': False,
+                                        'MASK_LAYER': mask,
+                                        'OUTPUT': outsource}, context, feedback),
+                ['gdal_sieve.py',
+                 '-st 10 -4 -mask ' +
+                 mask +
+                 ' -of GTiff ' +
+                 source + ' ' +
+                 outsource])
+
 
 class TestGdalOgrToPostGis(unittest.TestCase):
 

python/plugins/processing/tests/testdata/gdal_algorithm_tests.yaml

@@ -419,24 +419,6 @@ tests:
         hash: ee2b317e022da1001378fac60c9b613a74d3566b9870f9d121e6e322
         type: rasterhash
 
-# Disabled as gdal_sieve is not available on Travis
-#  - algorithm: gdal:sieve
-#    name: Sieve
-#    params:
-#      EIGHT_CONNECTEDNESS: false
-#      INPUT:
-#        name: dem.tif
-#        type: raster
-#      MASK_LAYER:
-#        name: dem.tif
-#        type: raster
-#      NO_MASK: false
-#      THRESHOLD: 10
-#    results:
-#      OUTPUT:
-#        hash: 1ea6a8c838add299dc3f6f9f529eb5945664f68bae97be9ca80b1754
-#        type: rasterhash
-
   - algorithm: gdal:slope
     name: Slope
     params: