wip

martin/src/cog/errors.rs

@@ -39,7 +39,18 @@ pub enum CogError {
     WriteToPngFailed(PathBuf, EncodingError),
 
     #[error(
-        "The bit depth {} of the tiff file {1} is not accepted by png crate when encoding tif chunk data to png"
+        "The combination of bit depth {0} and colory typr {2:?} of the tiff file {1} is not accepted by png crate when encoding tif chunk data to png"
     )]
     PngBitDepthNotAccepted(u8, PathBuf, ColorType),
+
+    #[error(
+        "The color type {0:?} and its bit depth of the tiff file {1} is not supported by png crate"
+    )]
+    NotSupportedColorTypeAndBitDepth(tiff::ColorType, PathBuf),
+
+    #[error("Couldn't parse the {0} value in gdal metadata(tiff tag 42112) from {1}")]
+    ParseSTATISTICSValueFailed(String, PathBuf),
+
+    #[error("todo")]
+    InvalidGdalMetaData(String, PathBuf),
 }