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Properly use premultiplied alpha

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Chlorospingus
2025-05-28 14:34:21 -07:00
parent 3bcccb2e87
commit 1eff2cd4f7
6 changed files with 69 additions and 54 deletions
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13
src/graphics/circle.rs
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@@ -24,19 +24,18 @@ impl Drawable for Circle {
for l_row in 1..self.radius {
let inner_diff = (((self.radius-1).pow(2) - l_row.pow(2)) as f64).sqrt();
let outer_diff = ((self.radius.pow(2) - l_row.pow(2)) as f64).sqrt();
let row: Vec<u32> = vec![self.color; 2*(inner_diff.floor() as usize)];
shm_pool.write(&row, (self.y-l_row)*buffer.width + self.x - inner_diff.floor() as usize + buffer.offset);
shm_pool.write(&row, (self.y+l_row-1)*buffer.width + self.x - inner_diff.floor() as usize + buffer.offset);
shm_pool.write(self.color, (self.y-l_row)*buffer.width + self.x - inner_diff.floor() as usize + buffer.offset, 2*(inner_diff.floor() as usize));
shm_pool.write(self.color, (self.y+l_row-1)*buffer.width + self.x - inner_diff.floor() as usize + buffer.offset, 2*(inner_diff.floor() as usize));
for l_col in (inner_diff.floor() as usize+1)..(outer_diff.ceil() as usize) {
let distance = ((l_row.pow(2) + l_col.pow(2)) as f64).sqrt();
let offset = (self.y-l_row)*buffer.width + self.x - l_col + buffer.offset;
shm_pool.write_pixel(color_blend(self.color, shm_pool.read_pixel(offset).unwrap(), distance.fract()), offset);
shm_pool.write_pixel(color_blend(self.color, 0, distance.fract()), offset);
let offset = (self.y-l_row)*buffer.width + self.x + l_col-1 + buffer.offset;
shm_pool.write_pixel(color_blend(self.color, shm_pool.read_pixel(offset).unwrap(), distance.fract()), offset);
shm_pool.write_pixel(color_blend(self.color, 0, distance.fract()), offset);
let offset = (self.y+l_row-1)*buffer.width + self.x - l_col + buffer.offset;
shm_pool.write_pixel(color_blend(self.color, shm_pool.read_pixel(offset).unwrap(), distance.fract()), offset);
shm_pool.write_pixel(color_blend(self.color, 0, distance.fract()), offset);
let offset = (self.y+l_row-1)*buffer.width + self.x + l_col-1 + buffer.offset;
shm_pool.write_pixel(color_blend(self.color, shm_pool.read_pixel(offset).unwrap(), distance.fract()), offset);
shm_pool.write_pixel(color_blend(self.color, 0, distance.fract()), offset);
}
}
}