Start bringing back saga algs - split RGB bands

Author: nyalldawson

python/plugins/processing/algs/replacer.py

@@ -0,0 +1,54 @@
+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    SagaAlgorithmBase.py
+    ---------------------
+    Date                 : August 2017
+    Copyright            : (C) 2017 by Nyall Dawson
+    Email                : nyall dot dawson at gmail dot com
+***************************************************************************
+*                                                                         *
+*   This program is free software; you can redistribute it and/or modify  *
+*   it under the terms of the GNU General Public License as published by  *
+*   the Free Software Foundation; either version 2 of the License, or     *
+*   (at your option) any later version.                                   *
+*                                                                         *
+***************************************************************************
+"""
+
+__author__ = 'Nyall Dawson'
+__date__ = 'August 2017'
+__copyright__ = '(C) 2017, Nyall Dawson'
+
+# This will get replaced with a git SHA1 when you do a git archive
+
+__revision__ = '$Format:%H$'
+
+import os
+
+from qgis.PyQt.QtCore import QCoreApplication
+from qgis.PyQt.QtGui import QIcon
+from qgis.core import QgsProcessingAlgorithm
+
+
+pluginPath = os.path.normpath(os.path.join(
+    os.path.split(os.path.dirname(__file__))[0], os.pardir))
+
+
+class SagaAlgorithmBase(QgsProcessingAlgorithm):
+
+    def __init__(self):
+        super().__init__()
+        self.output_values = {}
+
+    def icon(self):
+        return QIcon(os.path.join(pluginPath, 'images', 'saga.png'))
+
+    def createInstance(self, config={}):
+        return self.__class__()
+
+    def tr(self, string, context=''):
+        if context == '':
+            context = self.__class__.__name__
+        return QCoreApplication.translate(context, string)

python/plugins/processing/algs/saga/SagaAlgorithmBase.py

@@ -26,37 +26,32 @@
 __revision__ = '$Format:%H$'
 
 import os
-from qgis.PyQt.QtGui import QIcon
-from processing.core.GeoAlgorithm import GeoAlgorithm
-from processing.core.parameters import ParameterRaster
-from processing.core.outputs import OutputRaster
+from qgis.core import (QgsProcessingParameterRasterLayer,
+                       QgsProcessingParameterRasterDestination)
 from processing.tools.system import getTempFilename
 from . import SagaUtils
+from .SagaAlgorithmBase import SagaAlgorithmBase
 
 pluginPath = os.path.normpath(os.path.join(
     os.path.split(os.path.dirname(__file__))[0], os.pardir))
 
 
-class SplitRGBBands(GeoAlgorithm):
+class SplitRGBBands(SagaAlgorithmBase):
 
     INPUT = 'INPUT'
     R = 'R'
     G = 'G'
     B = 'B'
 
-    def icon(self):
-        return QIcon(os.path.join(pluginPath, 'images', 'saga.png'))
-
     def __init__(self):
         super().__init__()
-        self.addParameter(ParameterRaster(SplitRGBBands.INPUT,
-                                          self.tr('Input layer'), False))
-        self.addOutput(OutputRaster(SplitRGBBands.R,
-                                    self.tr('Output R band layer')))
-        self.addOutput(OutputRaster(SplitRGBBands.G,
-                                    self.tr('Output G band layer')))
-        self.addOutput(OutputRaster(SplitRGBBands.B,
-                                    self.tr('Output B band layer')))
+
+    def initAlgorithm(self, config=None):
+        self.addParameter(QgsProcessingParameterRasterLayer(self.INPUT, self.tr('Input layer')))
+
+        self.addParameter(QgsProcessingParameterRasterDestination(self.R, self.tr('Output R band layer')))
+        self.addParameter(QgsProcessingParameterRasterDestination(self.G, self.tr('Output G band layer')))
+        self.addParameter(QgsProcessingParameterRasterDestination(self.B, self.tr('Output B band layer')))
 
     def name(self):
         return 'splitrgbbands'
@@ -69,17 +64,19 @@ def group(self):
 
     def processAlgorithm(self, parameters, context, feedback):
         # TODO: check correct num of bands
-        input = self.getParameterValue(SplitRGBBands.INPUT)
+        inLayer = self.parameterAsRasterLayer(parameters, self.INPUT, context)
+        input = inLayer.source()
         temp = getTempFilename(None).replace('.', '')
         basename = os.path.basename(temp)
         validChars = \
             'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
         safeBasename = ''.join(c for c in basename if c in validChars)
         temp = os.path.join(os.path.dirname(temp), safeBasename)
 
-        r = self.getOutputValue(SplitRGBBands.R)
-        g = self.getOutputValue(SplitRGBBands.G)
-        b = self.getOutputValue(SplitRGBBands.B)
+        r = self.parameterAsOutputLayer(parameters, self.R, context)
+        g = self.parameterAsOutputLayer(parameters, self.G, context)
+        b = self.parameterAsOutputLayer(parameters, self.B, context)
+
         commands = []
         version = SagaUtils.getInstalledVersion(True)
         trailing = ""
@@ -95,3 +92,5 @@ def processAlgorithm(self, parameters, context, feedback):
 
         SagaUtils.createSagaBatchJobFileFromSagaCommands(commands)
         SagaUtils.executeSaga(feedback)
+
+        return {self.R: r, self.G: g, self.B: b}

python/plugins/processing/algs/saga/SplitRGBBands.py

@@ -56,7 +56,7 @@
 from processing.algs.qgis.QGISAlgorithmProvider import QGISAlgorithmProvider  # NOQA
 from processing.algs.grass7.Grass7AlgorithmProvider import Grass7AlgorithmProvider
 from processing.algs.gdal.GdalAlgorithmProvider import GdalAlgorithmProvider  # NOQA
-#from processing.algs.saga.SagaAlgorithmProvider import SagaAlgorithmProvider  # NOQA
+from processing.algs.saga.SagaAlgorithmProvider import SagaAlgorithmProvider  # NOQA
 from processing.script.ScriptAlgorithmProvider import ScriptAlgorithmProvider  # NOQA
 #from processing.preconfigured.PreconfiguredAlgorithmProvider import PreconfiguredAlgorithmProvider  # NOQA