mirror of
https://github.com/storytold/vectorcraft.git
synced 2026-10-26 02:37:01 -06:00
bflatasticandClaude Opus 5.5
b578c32f4d
document.export {format: "tga"} writes uncompressed true-colour Targa files
through the raster export path (resolution, background, anti-aliasing,
artboard ranges): depth 16 (5-5-5 with a one-bit alpha), 24 (flattened on
white) or 32 (8-bit alpha), rows bottom-up, with the version 2 footer.
Export As offers it with the tgaOptions dialog (Depth).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
31 lines
1.4 KiB
Rust
31 lines
1.4 KiB
Rust
//! Targa export: depths, alpha and the footer.
|
|
|
|
use super::on_white;
|
|
use super::tests_bmp::{art, decode, u16_at};
|
|
use super::tga::{self, TgaOptions};
|
|
|
|
#[test]
|
|
fn targa_depths_alpha_and_footer() {
|
|
let (w, h) = (7, 3);
|
|
let px = art(w, h);
|
|
for (depth, alpha_bits) in [(16, 1), (24, 0), (32, 8)] {
|
|
let file = tga::encode(&px, w, h, &TgaOptions { depth }).unwrap();
|
|
assert_eq!((file[2], file[16], file[17]), (2, depth, alpha_bits), "true colour, the depth byte, alpha bits");
|
|
assert_eq!((u16_at(&file, 12), u16_at(&file, 14)), (7, 3));
|
|
assert_eq!(file.len(), 18 + (w * h) as usize * usize::from(depth / 8) + 26);
|
|
assert!(file.ends_with(b"TRUEVISION-XFILE.\0"));
|
|
let img = decode(&file, image::ImageFormat::Tga);
|
|
assert_eq!(img.dimensions(), (w, h));
|
|
let want = on_white(px[(2 * w as usize + 3) * 4..][..4].try_into().unwrap());
|
|
let got = img.get_pixel(3, 2).0;
|
|
assert!(got[..3].iter().zip(want).all(|(a, b)| a.abs_diff(b) <= 8), "depth {depth}: {got:?} vs {want:?}");
|
|
match depth {
|
|
32 => assert_eq!((img.get_pixel(0, 0).0[3], img.get_pixel(1, 0).0[3]), (0, 128), "8-bit alpha"),
|
|
24 => assert_eq!(img.get_pixel(0, 0).0, [255; 4], "flattened on white"),
|
|
_ => {}
|
|
}
|
|
}
|
|
assert!(tga::encode(&px, w, h, &TgaOptions { depth: 8 }).is_err());
|
|
assert!(tga::encode(&px, 70_000, 1, &TgaOptions::default()).is_err(), "too wide");
|
|
}
|