tiff_core/
sample.rs

1use crate::layout::RasterLayout;
2
3/// Types that can be read directly from a decoded TIFF raster.
4pub trait TiffSample: Clone + 'static {
5    fn matches_layout(layout: &RasterLayout) -> bool;
6    fn decode_many(bytes: &[u8]) -> Vec<Self>;
7    fn type_name() -> &'static str;
8}
9
10macro_rules! impl_tiff_sample {
11    ($ty:ty, $format:expr, $bits:expr, $chunk:expr, $from_ne:expr) => {
12        impl TiffSample for $ty {
13            fn matches_layout(layout: &RasterLayout) -> bool {
14                layout.sample_format == $format && layout.bits_per_sample == $bits
15            }
16
17            fn decode_many(bytes: &[u8]) -> Vec<Self> {
18                bytes.chunks_exact($chunk).map($from_ne).collect()
19            }
20
21            fn type_name() -> &'static str {
22                stringify!($ty)
23            }
24        }
25    };
26}
27
28impl_tiff_sample!(u8, 1, 8, 1, |chunk: &[u8]| chunk[0]);
29impl_tiff_sample!(i8, 2, 8, 1, |chunk: &[u8]| chunk[0] as i8);
30impl_tiff_sample!(u16, 1, 16, 2, |chunk: &[u8]| u16::from_ne_bytes(
31    chunk.try_into().unwrap()
32));
33impl_tiff_sample!(i16, 2, 16, 2, |chunk: &[u8]| i16::from_ne_bytes(
34    chunk.try_into().unwrap()
35));
36impl_tiff_sample!(u32, 1, 32, 4, |chunk: &[u8]| u32::from_ne_bytes(
37    chunk.try_into().unwrap()
38));
39impl_tiff_sample!(i32, 2, 32, 4, |chunk: &[u8]| i32::from_ne_bytes(
40    chunk.try_into().unwrap()
41));
42impl_tiff_sample!(f32, 3, 32, 4, |chunk: &[u8]| f32::from_ne_bytes(
43    chunk.try_into().unwrap()
44));
45impl_tiff_sample!(u64, 1, 64, 8, |chunk: &[u8]| u64::from_ne_bytes(
46    chunk.try_into().unwrap()
47));
48impl_tiff_sample!(i64, 2, 64, 8, |chunk: &[u8]| i64::from_ne_bytes(
49    chunk.try_into().unwrap()
50));
51impl_tiff_sample!(f64, 3, 64, 8, |chunk: &[u8]| f64::from_ne_bytes(
52    chunk.try_into().unwrap()
53));
tiff_core/sample.rs

tiff_core/
sample.rs
