Add set_scale and set_offset to Rasterband

CHANGES.md

@@ -75,6 +75,10 @@
 
   - <https://github.com/georust/gdal/pull/284>
 
+- Add `Rasterband::set_scale` and `Rasterband::set_offset` methods
+
+  - <https://github.com/georust/gdal/pull/294>
+
 ## 0.12
 
 - Bump Rust edition to 2021

src/raster/rasterband.rs

@@ -472,6 +472,15 @@ impl<'a> RasterBand<'a> {
         None
     }
 
+    /// Set the scale for this band.
+    pub fn set_scale(&mut self, scale: f64) -> Result<()> {
+        let rv = unsafe { gdal_sys::GDALSetRasterScale(self.c_rasterband, scale) };
+        if rv != CPLErr::CE_None {
+            return Err(_last_cpl_err(rv));
+        }
+        Ok(())
+    }
+
     /// Returns the offset of this band if set.
     pub fn offset(&self) -> Option<f64> {
         let mut pb_success = 1;
@@ -482,6 +491,15 @@ impl<'a> RasterBand<'a> {
         None
     }
 
+    /// Set the offset for this band.
+    pub fn set_offset(&mut self, offset: f64) -> Result<()> {
+        let rv = unsafe { gdal_sys::GDALSetRasterOffset(self.c_rasterband, offset) };
+        if rv != CPLErr::CE_None {
+            return Err(_last_cpl_err(rv));
+        }
+        Ok(())
+    }
+
     /// Get actual block size (at the edges) when block size
     /// does not divide band size.
     #[cfg(any(all(major_is_2, minor_ge_2), major_ge_3))] // GDAL 2.2 .. 2.x or >= 3

src/raster/tests.rs

@@ -693,6 +693,26 @@ fn test_set_rasterband_color_interp() {
     assert_eq!(band_interp, ColorInterpretation::AlphaBand);
 }
 
+#[test]
+fn test_set_rasterband_scale() {
+    let driver = Driver::get_by_name("MEM").unwrap();
+    let dataset = driver.create("", 1, 1, 1).unwrap();
+    let mut rasterband = dataset.rasterband(1).unwrap();
+    let scale = 1234.5678;
+    rasterband.set_scale(scale).unwrap();
+    assert_eq!(rasterband.scale().unwrap(), scale);
+}
+
+#[test]
+fn test_set_rasterband_offset() {
+    let driver = Driver::get_by_name("MEM").unwrap();
+    let dataset = driver.create("", 1, 1, 1).unwrap();
+    let mut rasterband = dataset.rasterband(1).unwrap();
+    let offset = -123.456;
+    rasterband.set_offset(offset).unwrap();
+    assert_eq!(rasterband.offset().unwrap(), offset);
+}
+
 #[test]
 fn test_color_interp_names() {
     assert_eq!(ColorInterpretation::AlphaBand.name(), "Alpha");