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Optimize color transform #86

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merged 1 commit into from
Aug 1, 2024
+12 −10
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Optimize color transform #86

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22 changes: 12 additions & 10 deletions src/lossless_transform.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -205,22 +205,24 @@ pub(crate) fn apply_color_transform(
let width = usize::from(width);

for (y, row) in image_data.chunks_exact_mut(width * 4).enumerate() {
for (x, pixel) in row.chunks_exact_mut(4).enumerate() {
let block_index = (y >> size_bits) * block_xsize + (x >> size_bits);
for (block_x, block) in row.chunks_mut(4 << size_bits).enumerate() {
let block_index = (y >> size_bits) * block_xsize + block_x;
let red_to_blue = transform_data[block_index * 4];
let green_to_blue = transform_data[block_index * 4 + 1];
let green_to_red = transform_data[block_index * 4 + 2];

let green = u32::from(pixel[1]);
let mut temp_red = u32::from(pixel[0]);
let mut temp_blue = u32::from(pixel[2]);
for pixel in block.chunks_exact_mut(4) {
let green = u32::from(pixel[1]);
let mut temp_red = u32::from(pixel[0]);
let mut temp_blue = u32::from(pixel[2]);

temp_red += color_transform_delta(green_to_red as i8, green as i8);
temp_blue += color_transform_delta(green_to_blue as i8, green as i8);
temp_blue += color_transform_delta(red_to_blue as i8, temp_red as i8);
temp_red += color_transform_delta(green_to_red as i8, green as i8);
temp_blue += color_transform_delta(green_to_blue as i8, green as i8);
temp_blue += color_transform_delta(red_to_blue as i8, temp_red as i8);

pixel[0] = (temp_red & 0xff) as u8;
pixel[2] = (temp_blue & 0xff) as u8;
pixel[0] = (temp_red & 0xff) as u8;
pixel[2] = (temp_blue & 0xff) as u8;
}
}
}
}
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