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test(font/sprite): generate diff image on failed regression check

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This commit is contained in:
Qwerasd
2024-09-30 11:49:56 -06:00
parent ced4247e55
commit d63cf6eaec
1 changed files with 24 additions and 2 deletions
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26
src/font/sprite/Box.zig
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@ -2167,13 +2167,35 @@ test "render all sprites" {
if (stream.changeDetected()) {
log.err(
"Change detected from ground truth, dumping to ./Box_test.ppm for comparison.",
\\
\\!! [Box.zig] Change detected from ground truth!
\\!! Dumping ./Box_test.ppm and ./Box_test_diff.ppm
\\!! Please check changes and update Box.ppm in testdata if intended.
,
.{},
);
const ppm = try std.fs.cwd().createFile("Box_test.ppm", .{});
defer ppm.close();
try atlas_grayscale.dump(ppm.writer());
const diff = try std.fs.cwd().createFile("Box_test_diff.ppm", .{});
defer diff.close();
var writer = diff.writer();
try writer.print(
\\P6
\\{d} {d}
\\255
\\
, .{ atlas_grayscale.size, atlas_grayscale.size });
for (ground_truth[try diff.getPos()..], atlas_grayscale.data) |a, b| {
if (a == b) {
try writer.writeByteNTimes(a / 3, 3);
} else {
try writer.writeByte(a);
try writer.writeByte(b);
try writer.writeByte(0);
}
}
}
}