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Simplify reduce_color_type

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This commit is contained in:
Andrew 2022-12-15 13:41:08 +13:00
parent 7ba1f9bbac
commit e3d82db96b
1 changed files with 18 additions and 26 deletions
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44
src/reduction/mod.rs
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@ -199,48 +199,40 @@ pub fn reduce_color_type(
// Go down one step at a time
// Maybe not the most efficient, but it's safe
if reduced.ihdr.color_type == ColorType::RGBA {
if let Some(r) = if grayscale_reduction {
reduce_rgb_to_grayscale(&reduced)
} else {
None
}
.or_else(|| reduced_alpha_channel(&reduced, optimize_alpha))
{
if grayscale_reduction && matches!(reduced.ihdr.color_type, ColorType::RGBA | ColorType::RGB) {
if let Some(r) = reduce_rgb_to_grayscale(&reduced) {
reduced = Cow::Owned(r);
} else if let Some(r) = reduce_to_palette(&reduced) {
reduced = Cow::Owned(r);
should_reduce_bit_depth = true;
should_reduce_bit_depth = reduced.ihdr.color_type == ColorType::Grayscale;
}
}
// Attempt grayscale alpha reduction before palette, as grayscale will typically be smaller than indexed
if reduced.ihdr.color_type == ColorType::GrayscaleAlpha {
if let Some(r) =
reduced_alpha_channel(&reduced, optimize_alpha).or_else(|| reduce_to_palette(&reduced))
{
if let Some(r) = reduced_alpha_channel(&reduced, optimize_alpha) {
reduced = Cow::Owned(r);
should_reduce_bit_depth = true;
}
}
if reduced.ihdr.color_type == ColorType::RGB {
if let Some(r) = if grayscale_reduction {
reduce_rgb_to_grayscale(&reduced)
} else {
None
}
.or_else(|| reduce_to_palette(&reduced))
{
if matches!(
reduced.ihdr.color_type,
ColorType::RGBA | ColorType::RGB | ColorType::GrayscaleAlpha
) {
if let Some(r) = reduce_to_palette(&reduced) {
reduced = Cow::Owned(r);
should_reduce_bit_depth = true;
// Make sure that palette gets sorted. Ideally, this should be done within reduce_to_palette.
if let Some(r) = reduced_palette(&reduced, optimize_alpha) {
reduced = Cow::Owned(r);
}
}
}
//Make sure that palette gets sorted. Ideally, this should be done within reduced_color_to_palette.
if should_reduce_bit_depth && reduced.ihdr.color_type == ColorType::Indexed {
if let Some(r) = reduced_palette(&reduced, optimize_alpha) {
// Attempt RGBA alpha reduction after palette, so it can be skipped if palette was successful
if reduced.ihdr.color_type == ColorType::RGBA {
if let Some(r) = reduced_alpha_channel(&reduced, optimize_alpha) {
reduced = Cow::Owned(r);
should_reduce_bit_depth = true;
}
}