Added write support for GDALRaster

- Instantiation of GDALRaster instances from dict or json data.
- Retrieve and write pixel values in GDALBand objects.
- Support for the GDALFlushCache in gdal C prototypes
- Added private flush method to GDALRaster to make sure all
  data is written to files when file-based rasters are changed.
- Replaced ``ptr`` with ``_ptr`` for internal ptr variable

Refs #23804. Thanks Claude Paroz and Tim Graham for the reviews.

4 files changed, 12 insertions, 0 deletions

diff --git a/tests/gis_tests/data/__init__.py b/tests/gis_tests/data/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/tests/gis_tests/data/__init__.py
diff --git a/tests/gis_tests/data/rasters/__init__.py b/tests/gis_tests/data/rasters/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/tests/gis_tests/data/rasters/__init__.py
diff --git a/tests/gis_tests/data/rasters/raster.tif b/tests/gis_tests/data/rasters/raster.tif
new file mode 100644
index 0000000000..ddc7605703
--- /dev/null
+++ b/tests/gis_tests/data/rasters/raster.tif
diff --git a/tests/gis_tests/data/rasters/textrasters.py b/tests/gis_tests/data/rasters/textrasters.py
new file mode 100644
index 0000000000..b12ce62afc
--- /dev/null
+++ b/tests/gis_tests/data/rasters/textrasters.py
@@ -0,0 +1,12 @@
+JSON_RASTER = """{
+    "srid": 4326,
+    "origin": [0, 0],
+    "scale": [1, 1],
+    "skew": [0, 0],
+    "width": 5,
+    "height": 5,
+    "nr_of_bands": 1,
+    "bands": [{"data": [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
+                        15, 16, 17, 18, 19, 20, 21, 22, 23, 24]}]
+}
+"""