Merge pull request #46 from AllenDang/master

Fix size reader for ktx2 and the test case, original code always retu…

Author: Roughsketch

src/formats/ktx2.rs

@@ -6,7 +6,7 @@ use crate::{
 };
 
 pub fn size<R: BufRead + Seek>(reader: &mut R) -> ImageResult<ImageSize> {
-    reader.seek(SeekFrom::Start(16))?;
+    reader.seek(SeekFrom::Start(20))?;
 
     let width = read_u32(reader, &Endian::Little)? as usize;
     let height = read_u32(reader, &Endian::Little)? as usize;

tests/ktx2.rs

@@ -8,7 +8,7 @@ fn ktx2_test() {
     assert_eq!(
         dim,
         ImageSize {
-            width: 1,
+            width: 256,
             height: 256
         }
     );