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ludic.lab: 16-bit PNGs (lab_png_write16_from), so a test can write a height map render3d reads back as R16

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-09-29 21:47:37 +03:00
parent 0a6485ca71
commit 55def863d3
4 changed files with 40 additions and 10 deletions
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12
packages/ludic.lab/tests/lab_test.ludic
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@ -47,6 +47,18 @@ program LabTest {
expect(not lab_png_write(lab_png_st, `{dir}/lab_test_short.png`, 9, 9, 4, px))
}
test "16-bit samples become a 16-bit PNG, two bytes a sample" (lab_png_st: LabPngState) {
let dir = Os.temp_dir()
let px = buffer(3 * 2 * 2)
for i in 0 .. 12 { px[i] = i * 20 }
expect(lab_png_write16_from(lab_png_st, `{dir}/lab_test_r16.png`, 3, 2, 1, px, 0))
let p = Fs.read_bytes(`{dir}/lab_test_r16.png`)
expect_eq(p[24], 16) # bit depth
expect_eq(p[25], 0) # colour type grey
expect_eq(len(p), lp_png_bytes(3 * 2, 2))
expect(not lab_png_write16_from(lab_png_st, `{dir}/lab_test_r16_short.png`, 3, 3, 1, px, 0))
}
test "a half float and a float read as the numbers they store" {
let b = buffer(8)
b[0] = 0; b[1] = 60 # half 1.0 = 0x3C00