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Add anti-aliasing to corners #232 #234

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merged 4 commits into from
Nov 22, 2023
Merged

Add anti-aliasing to corners #232 #234

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329e58c
Implement blur/anti-aliasing on edges of window frame #232
JoostScheffer May 20, 2023
a111c4a
fix missing -1 for top right corner, add example directory and update…
JoostScheffer May 20, 2023
e13fe14
Delete example.sh
JoostScheffer May 20, 2023
d8c2884
Create example.sh
JoostScheffer May 20, 2023
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Implement blur/anti-aliasing on edges of window frame #232
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@JoostScheffer
JoostScheffer committed May 20, 2023
commit 329e58c45a1c9e810f71bb333405373dd0d89f71
31 changes: 24 additions & 7 deletions src/utils.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -269,31 +269,48 @@ pub(crate) fn copy_alpha(src: &RgbaImage, dst: &mut RgbaImage, x: u32, y: u32) {
pub(crate) fn round_corner(image: &mut DynamicImage, radius: u32) {
// draw a circle with given foreground on given background
// then split it into four pieces and paste them to the four corner of the image
//
// the circle is drawn on a bigger image to avoid the aliasing
// later it will be scaled to the correct size
// we add +1 (to the radius) to make sure that there is also space for the border to mitigate artefacts when scaling
// note that the +1 isn't added to the radius when drawing the circle
let mut circle =
RgbaImage::from_pixel(radius * 2 + 1, radius * 2 + 1, Rgba([255, 255, 255, 0]));
RgbaImage::from_pixel((radius + 1) * 4, (radius + 1) * 4, Rgba([255, 255, 255, 0]));

let width = image.width();
let height = image.height();

// use the bottom right pixel to get the color of the foreground
let foreground = image.get_pixel(width - 1, height - 1);

// TODO: need a blur on edge
draw_filled_circle_mut(
&mut circle,
(radius as i32, radius as i32),
radius as i32,
(((radius + 1) * 2) as i32, ((radius + 1) * 2) as i32),
radius as i32 * 2,
foreground,
);

let part = crop_imm(&circle, 0, 0, radius, radius);
// scale down the circle to the correct size
let circle = resize(
&circle,
(radius + 1) * 2,
(radius + 1) * 2,
FilterType::Triangle,
);

// top left
let part = crop_imm(&circle, 1, 1, radius, radius);
image.copy_from(&*part, 0, 0).unwrap();

let part = crop_imm(&circle, radius + 1, 0, radius, radius);
// top right
let part = crop_imm(&circle, radius + 1, 1, radius, radius);
image.copy_from(&*part, width - radius, 0).unwrap();

let part = crop_imm(&circle, 0, radius + 1, radius, radius);
// bottom left
let part = crop_imm(&circle, 1, radius + 1, radius, radius);
image.copy_from(&*part, 0, height - radius).unwrap();

// bottom right
let part = crop_imm(&circle, radius + 1, radius + 1, radius, radius);
image
.copy_from(&*part, width - radius, height - radius)
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