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This commit is contained in:
Robert Garrett
2024-05-09 16:28:23 -05:00
parent 41d547f3ed
commit 761beac5fd
1 changed files with 54 additions and 23 deletions
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77
src/main.rs
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@@ -160,7 +160,10 @@ where
#[cfg(test)]
mod test {
use super::*;
impl <I> Decoder <I> where I: Iterator<Item=u8> {
impl<I> Decoder<I>
where
I: Iterator<Item = u8>,
{
// A hack to unit test the index lookup behavior. A partial test can be done
// to verify the basic indexing principles by preloading a known buffer and
// then extracting back-referenced data out of it. A complete test should
@@ -479,26 +482,38 @@ mod test {
#[test]
fn decoder_prev_pixel_verify() {
let compressed = [
QOI_OP_RGB, 0x10, 0x10, 0x10,
QOI_OP_RGBA, 0x20, 0x20, 0x20, 0x20,
QOI_OP_RGB,
0x10,
0x10,
0x10,
QOI_OP_RGBA,
0x20,
0x20,
0x20,
0x20,
(QOI_OP_INDEX | 1),
(QOI_OP_DIFF | 0b0011_1111),
(QOI_OP_LUMA | 0b0011_1111), 0b1111_1111,
(QOI_OP_LUMA | 0b0011_1111),
0b1111_1111,
(QOI_OP_RUN | 2),
QOI_OP_RGBA, 0xFF, 0xFF, 0xFF, 0xFF,
QOI_OP_RGBA,
0xFF,
0xFF,
0xFF,
0xFF,
];
let expected = [
PixelRGBA::new(0, 0, 0, 0xFF), // init
PixelRGBA::new(0x10, 0x10, 0x10, 0xFF), // RGB
PixelRGBA::new(0x10, 0x10, 0x10, 0xFF), // RGB
PixelRGBA::new(0x20, 0x20, 0x20, 0x20), // RGBA
PixelRGBA::new(0, 0, 0, 0), // INDEX -- this doubles as a small test for the backbuffer operation
PixelRGBA::new(0x1, 0x1, 0x1, 0x0), // DIFF
PixelRGBA::new(0x27, 0x20, 0x27, 0x0), // LUMA
PixelRGBA::new(0x27, 0x20, 0x27, 0x0), // RUN 1
PixelRGBA::new(0x27, 0x20, 0x27, 0x0), // RUN 2
PixelRGBA::new(0x27, 0x20, 0x27, 0x0), // RUN 3
PixelRGBA::new(0xFF, 0xFF, 0xFF, 0xFF)
PixelRGBA::new(0, 0, 0, 0), // INDEX -- this doubles as a small test for the backbuffer operation
PixelRGBA::new(0x1, 0x1, 0x1, 0x0), // DIFF
PixelRGBA::new(0x27, 0x20, 0x27, 0x0), // LUMA
PixelRGBA::new(0x27, 0x20, 0x27, 0x0), // RUN 1
PixelRGBA::new(0x27, 0x20, 0x27, 0x0), // RUN 2
PixelRGBA::new(0x27, 0x20, 0x27, 0x0), // RUN 3
PixelRGBA::new(0xFF, 0xFF, 0xFF, 0xFF),
];
let mut decoder = Decoder::new(compressed.into_iter());
@@ -516,21 +531,37 @@ mod test {
#[test]
fn decoder_backbuffer_verify() {
let compressed = [
QOI_OP_RGB, 0x10, 0x10, 0x10,
QOI_OP_RGBA, 0x20, 0x20, 0x20, 0x20,
QOI_OP_RGBA, 0x03, 0x01, 0x01, 0x04, // filler to populate backbuffer[1] for the next OP_INDEX
QOI_OP_RGB,
0x10,
0x10,
0x10,
QOI_OP_RGBA,
0x20,
0x20,
0x20,
0x20,
QOI_OP_RGBA,
0x03,
0x01,
0x01,
0x04, // filler to populate backbuffer[1] for the next OP_INDEX
(QOI_OP_INDEX | 1),
(QOI_OP_DIFF | 0b0011_1111), // + Pix (1, 1, 1, 0)
(QOI_OP_LUMA | 0b0011_1111), 0b1111_1111, // + Pix (38, 31, 38)
(QOI_OP_DIFF | 0b0011_1111), // + Pix (1, 1, 1, 0)
(QOI_OP_LUMA | 0b0011_1111),
0b1111_1111, // + Pix (38, 31, 38)
(QOI_OP_RUN | 2),
QOI_OP_RGBA, 0xFF, 0xFF, 0xFF, 0xFF,
QOI_OP_RGBA,
0xFF,
0xFF,
0xFF,
0xFF,
];
// these are the indices where we're expecting each pixel to land.
// Each pixel gets put into this backbuffer as it's en/de-coded.
// For RGB and RGBA, it'll simply assign a value into the index.
// For INDEX, the write can be skipped, and the expected index will be
// the same as the one in the op code.
// the same as the one in the op code.
// *however* it's possible for an index to refer to a value that shouldn't
// hash to that location. The backbuffer initialization will cause this
// scenario.
@@ -549,7 +580,7 @@ mod test {
1, // Pix (3, 1, 1, 4)
16, // Pix (4, 2, 2, 4)
39, // Pix (42, 33, 40, 4)
39, // run x1
39, // run x1
39, // run x2
39, // run x3
38, // final RGBA
@@ -562,7 +593,7 @@ mod test {
// query it out:
let stored_px = decoder.peek_backbuffer(indices[iters]);
// and compare it to the value returned from iteration
assert_eq!(&pixel, stored_px);
} else {