danvics/oxipng
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Fix grayscale_reduction option

Browse source
This commit is contained in:
Andrew 2023-05-23 16:38:07 +12:00 committed by Josh Holmer
parent 12761bbfb1
commit 86fccf082a
3 changed files with 9 additions and 5 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
benches/reductions.rs
View file

@ -257,7 +257,7 @@ fn reductions_palette_8_to_grayscale_8(b: &mut Bencher) {
));
let png = PngData::new(&input, &Options::default()).unwrap();
b.iter(|| color::indexed_to_channels(&png.raw));
b.iter(|| color::indexed_to_channels(&png.raw, true));
}
#[bench]

8
src/reduction/color.rs
View file

@ -132,7 +132,7 @@ pub fn reduced_rgb_to_grayscale(png: &PngImage) -> Option<PngImage> {
/// Attempt to convert indexed to a different color type, returning the resulting image if successful
#[must_use]
pub fn indexed_to_channels(png: &PngImage) -> Option<PngImage> {
pub fn indexed_to_channels(png: &PngImage, allow_grayscale: bool) -> Option<PngImage> {
if png.ihdr.bit_depth != BitDepth::Eight {
return None;
}
@ -142,7 +142,11 @@ pub fn indexed_to_channels(png: &PngImage) -> Option<PngImage> {
};
// Determine which channels are required
let is_gray = palette.iter().all(|c| c.r == c.g && c.g == c.b);
let is_gray = if allow_grayscale {
palette.iter().all(|c| c.r == c.g && c.g == c.b)
} else {
false
};
let has_alpha = palette.iter().any(|c| c.a != 255);
let color_type = match (is_gray, has_alpha) {
(false, true) => ColorType::RGBA,

4
src/reduction/mod.rs
View file

@ -50,7 +50,7 @@ pub(crate) fn perform_reductions(
// Attempt to reduce RGB to grayscale
// This is just removal of bytes and does not need to be evaluated
if opts.color_type_reduction && !deadline.passed() {
if opts.color_type_reduction && opts.grayscale_reduction && !deadline.passed() {
if let Some(reduced) = reduced_rgb_to_grayscale(&png) {
png = Arc::new(reduced);
reduction_occurred = true;
@ -98,7 +98,7 @@ pub(crate) fn perform_reductions(
// Attempt to convert from indexed to channels
// This may give a better result due to dropping the PLTE chunk
if opts.color_type_reduction && !deadline.passed() {
if let Some(reduced) = indexed_to_channels(&png) {
if let Some(reduced) = indexed_to_channels(&png, opts.grayscale_reduction) {
// This result should not be passed on to subsequent reductions
eval.try_image(Arc::new(reduced));
evaluation_added = true;