processing: add support for rasters other than float in qgis/processing raster tools

Author: Giovanni Manghi

python/plugins/processing/tools/raster.py

@@ -32,19 +32,36 @@
 from osgeo import osr
 from PyQt4.QtCore import *
 from qgis.core import *
-
+from processing.core.GeoAlgorithmExecutionException import \
+        GeoAlgorithmExecutionException
 
 
 def scanraster(layer, progress):
     filename = unicode(layer.source())
     dataset = gdal.Open(filename, GA_ReadOnly)
     band = dataset.GetRasterBand(1)
     nodata = band.GetNoDataValue()
+    bandtype = gdal.GetDataTypeName(band.DataType)
     for y in xrange(band.YSize):
         progress.setPercentage(y / float(band.YSize) * 100)
         scanline = band.ReadRaster(0, y, band.XSize, 1, band.XSize, 1,
                                    band.DataType)
-        values = struct.unpack('f' * band.XSize, scanline)
+        if bandtype == 'Byte':
+	    values = struct.unpack('B' * band.XSize, scanline)
+        elif bandtype == 'Int16':
+	    values = struct.unpack('h' * band.XSize, scanline) 
+        elif bandtype == 'UInt16':
+	    values = struct.unpack('H' * band.XSize, scanline)
+        elif bandtype == 'Int32':
+	    values = struct.unpack('i' * band.XSize, scanline)
+        elif bandtype == 'UInt32':
+	    values = struct.unpack('I' * band.XSize, scanline) 
+        elif bandtype == 'Float32':
+	    values = struct.unpack('f' * band.XSize, scanline)
+        elif bandtype == 'Float64':
+	    values = struct.unpack('d' * band.XSize, scanline)
+	else:
+            raise GeoAlgorithmExecutionException('Raster format not supported')
         for value in values:
             if value == nodata:
                 value = None
@@ -99,4 +116,4 @@ def close(self):
         dst_ds.SetGeoTransform([self.minx, self.cellsize, 0,
                                 self.maxy, self.cellsize, 0])
         dst_ds.GetRasterBand(1).WriteArray(self.matrix)
-        dst_ds = None
+        dst_ds = None