use plain format if image is not the right shape

src/main.rs

@@ -315,10 +315,15 @@ fn convert(file_thing:std::fs::DirEntry) -> BoxResult<()>{
         Err(error::Error::new("Unknown texture format"))?
     };
 
+    let format=if image.width()%4!=0||image.height()%4!=0{
+        image_dds::ImageFormat::R8G8B8A8Srgb
+    }else{
+        image_dds::ImageFormat::BC7Srgb
+    };
     //this fails if the image dimensions are not a multiple of 4
     let dds = image_dds::dds_from_image(
         &image,
-        image_dds::ImageFormat::BC7Srgb,
+        format,
         image_dds::Quality::Slow,
         image_dds::Mipmaps::GeneratedAutomatic,
     )?;