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Change the values emitted for incorrect pixels to make small errors visible

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This commit is contained in:
Lars Bergstrom 2014-01-27 15:07:06 -06:00
parent d944567b9a
commit cb31b3cf6c
1 changed files with 10 additions and 4 deletions
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14
src/test/harness/reftest/reftest.rs
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@ -14,7 +14,6 @@ extern mod std;
use std::io;
use std::io::{File, Reader};
use std::io::process::ExitStatus;
use std::num::abs;
use std::os;
use std::run::{Process, ProcessOptions};
use std::str;
@ -139,9 +138,16 @@ fn check_reftest(reftest: Reftest) {
let right = png::load_png(&from_str::<Path>(right_filename).unwrap()).unwrap();
let pixels: ~[u8] = left.pixels.iter().zip(right.pixels.iter()).map(|(&a, &b)| {
let a_signed = a as i8;
let b_signed = b as i8;
255-abs(a_signed - b_signed) as u8
if (a as i8 - b as i8 == 0) {
// White for correct
0xFF
} else {
// "1100" in the RGBA channel with an error for an incorrect value
// This results in some number of C0 and FFs, which is much more
// readable (and distinguishable) than the previous difference-wise
// scaling but does not require reconstructing the actual RGBA pixel.
0xC0
}
}).collect();
if pixels.iter().any(|&a| a < 255) {