Add r.shade algorithm

python/plugins/processing/algs/grass7/description/r.shade.txt

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+r.shade
+Drapes a color raster over an shaded relief or aspect map. 
+Raster (r.*)
+ParameterRaster|shade|Name of shaded relief or aspect raster map|False
+ParameterRaster|color|Name of raster to drape over relief raster map|False
+ParameterNumber|brighten|Percent to brighten|-99|99|0|True
+ParameterString|bgcolor|Color to use instead of NULL values. Either a standard color name, R:G:B triplet, or "none"|None|False|True
+*ParameterBoolean|-c|Use colors from color tables for NULL values|False
+OutputRaster|output|Shaded

python/plugins/processing/algs/grass7/ext/r_shade.py

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+# -*- coding: utf-8 -*-
+
+"""
+***************************************************************************
+    r_shade.py
+    ----------
+    Date                 : February 2016
+    Copyright            : (C) 2016 by Médéric Ribreux
+    Email                : medspx at medspx dot fr
+***************************************************************************
+*                                                                         *
+*   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__ = 'Médéric Ribreux'
+__date__ = 'February 2016'
+__copyright__ = '(C) 2016, Médéric Ribreux'
+
+# This will get replaced with a git SHA1 when you do a git archive
+
+__revision__ = '$Format:%H$'
+
+
+def checkParameterValuesBeforeExecuting(alg):
+    """ Verify if we have the right parameters """
+    if alg.getParameterValue('brighten') and alg.getParameterValue('bgcolor'):
+        return alg.tr("You need to set either a brighten percentage or a NULL color !")
+    return None
+
+
+def processInputs(alg):
+    # We need to import all the bands and color tables of the input rasters
+    shade = alg.getParameterValue('shade')
+    color = alg.getParameterValue('color')
+    if color in alg.exportedLayers.keys():
+        return
+
+    for raster, method in (shade, 'r.external'), (color, 'r.in.gdal'):
+        alg.setSessionProjectionFromLayer(raster, alg.commands)
+
+        destFilename = alg.getTempFilename()
+        alg.exportedLayers[raster] = destFilename
+        command = '{} input={} output={} --overwrite -o'.format(method, raster, destFilename)
+        alg.commands.append(command)
+
+    alg.setSessionProjectionFromProject(alg.commands)
+
+    region = unicode(alg.getParameterValue(alg.GRASS_REGION_EXTENT_PARAMETER))
+    regionCoords = region.split(',')
+    command = 'g.region'
+    command += ' -a'
+    command += ' n=' + unicode(regionCoords[3])
+    command += ' s=' + unicode(regionCoords[2])
+    command += ' e=' + unicode(regionCoords[1])
+    command += ' w=' + unicode(regionCoords[0])
+    cellsize = alg.getParameterValue(alg.GRASS_REGION_CELLSIZE_PARAMETER)
+    if cellsize:
+        command += ' res=' + unicode(cellsize)
+    else:
+        command += ' res=' + unicode(alg.getDefaultCellsize())
+    alignToResolution = alg.getParameterValue(alg.GRASS_REGION_ALIGN_TO_RESOLUTION)
+    if alignToResolution:
+        command += ' -a'
+    alg.commands.append(command)
+
+
+def processOutputs(alg):
+    # Keep color table ?
+    output = alg.getOutputValue(u'output')
+    command = u"r.out.gdal -t createopt=\"TFW=YES,COMPRESS=LZW\" input={} output=\"{}\" --overwrite".format(
+        alg.exportedLayers[output],
+        output
+    )
+    alg.commands.append(command)
+    alg.outputCommands.append(command)