videoframe 0.2.0

A common vocabulary of pixel-format and color-metadata types for video processing pipelines.
Documentation 
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use super::*;
use std::vec;

/// Shared zero-filled palette for tests that don't care about palette contents.
static PALETTE: [[u8; 4]; 256] = [[0u8; 4]; 256];

#[test]
fn pal8_try_new_happy_path() {
  // stride == width; data exactly covers the frame
  let data = vec![0u8; 4 * 3];
  let f = Pal8Frame::try_new(&data, &PALETTE, 4, 3, 4).expect("valid frame");
  assert_eq!(f.width(), 4);
  assert_eq!(f.height(), 3);
  assert_eq!(f.stride(), 4);
  assert_eq!(f.data().len(), 12);
}

#[test]
fn pal8_try_new_zero_dimension() {
  let data = vec![0u8; 16];
  let e = Pal8Frame::try_new(&data, &PALETTE, 0, 4, 4).unwrap_err();
  assert!(matches!(e, Pal8FrameError::ZeroDimension(_)));
  let e = Pal8Frame::try_new(&data, &PALETTE, 4, 0, 4).unwrap_err();
  assert!(matches!(e, Pal8FrameError::ZeroDimension(_)));
}

#[test]
fn pal8_try_new_stride_too_small() {
  let data = vec![0u8; 16];
  let e = Pal8Frame::try_new(&data, &PALETTE, 8, 2, 4).unwrap_err();
  assert!(matches!(e, Pal8FrameError::InsufficientStride(_)));
}

#[test]
fn pal8_try_new_plane_too_short() {
  // stride * height = 4 * 3 = 12, but data is only 11 bytes
  let data = vec![0u8; 11];
  let e = Pal8Frame::try_new(&data, &PALETTE, 4, 3, 4).unwrap_err();
  assert!(matches!(e, Pal8FrameError::InsufficientPlane(_)));
}

#[test]
fn pal8_try_new_stride_wider_than_width() {
  // stride = 8 > width = 4; data must cover stride * height = 8 * 3 = 24
  let data = vec![0u8; 24];
  let f = Pal8Frame::try_new(&data, &PALETTE, 4, 3, 8).expect("padded stride valid");
  assert_eq!(f.width(), 4);
  assert_eq!(f.stride(), 8);
}

#[test]
#[should_panic(expected = "invalid Pal8Frame")]
fn pal8_new_panics_on_invalid() {
  let data = vec![0u8; 10];
  let _ = Pal8Frame::new(&data, &PALETTE, 16, 8, 16);
}