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update details for v0.2.15

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This commit is contained in:
Henry Schimke
2023-01-12 13:59:44 -06:00
parent ec0512722d
commit d163f677e8
4 changed files with 22 additions and 29 deletions
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36
src/buffered_image_luminance_source.rs
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@@ -98,27 +98,21 @@ impl BufferedImageLuminanceSource {
let mut raster: ImageBuffer<_, Vec<_>> = ImageBuffer::new(image.width(), image.height());
for x in 0..image.width() {
for y in 0..image.height() {
let pixel = img.get_pixel(x, y);
let [red, green, blue, alpha] = pixel.0;
if alpha == 0 {
// white, so we know its luminance is 255
raster.put_pixel(x, y, Luma([0xFF]))
} else {
// .299R + 0.587G + 0.114B (YUV/YIQ for PAL and NTSC),
// (306*R) >> 10 is approximately equal to R*0.299, and so on.
// 0x200 >> 10 is 0.5, it implements rounding.
raster.put_pixel(
x,
y,
Luma([((306 * (red as u64)
+ 601 * (green as u64)
+ 117 * (blue as u64)
+ 0x200)
>> 10) as u8]),
);
}
for (x, y, new_pixel) in raster.enumerate_pixels_mut() {
let pixel = img.get_pixel(x, y);
let [red, green, blue, alpha] = pixel.0;
if alpha == 0 {
// white, so we know its luminance is 255
*new_pixel = Luma([0xFF])
} else {
// .299R + 0.587G + 0.114B (YUV/YIQ for PAL and NTSC),
// (306*R) >> 10 is approximately equal to R*0.299, and so on.
// 0x200 >> 10 is 0.5, it implements rounding.
*new_pixel = Luma([((306 * (red as u64)
+ 601 * (green as u64)
+ 117 * (blue as u64)
+ 0x200)
>> 10) as u8])
}
}