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Compare images without allocating memory (#107)

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Kornel 2018-06-07 02:59:43 +01:00 committed by Josh Holmer
parent 5570a24781
commit 3e5b61e0c8
1 changed files with 9 additions and 6 deletions
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15
src/lib.rs
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@ -583,7 +583,7 @@ fn optimize_png(
if let Ok(new_png) = new_png {
if let Ok(old_png) = old_png {
if image_to_pixel_array(&old_png) == image_to_pixel_array(&new_png) {
if images_equal(&old_png, &new_png) {
return Ok(output);
}
} else {
@ -737,10 +737,13 @@ fn copy_permissions(input_path: &Path, out_file: &File, verbosity: Option<u8>) {
}
}
fn image_to_pixel_array(image: &DynamicImage) -> Vec<Vec<u8>> {
image
.pixels()
/// Compares images pixel by pixel for equivalent content
fn images_equal(old_png: &DynamicImage, new_png: &DynamicImage) -> bool {
let a = old_png.pixels()
.map(|x| x.2.channels().to_owned())
.filter(|p| !(p.len() == 4 && p[3] == 0))
.collect()
.filter(|p| !(p.len() == 4 && p[3] == 0));
let b = new_png.pixels()
.map(|x| x.2.channels().to_owned())
.filter(|p| !(p.len() == 4 && p[3] == 0));
a.eq(b)
}