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improved draw_text_mut performance #663

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Jun 7, 2024
Merged

improved draw_text_mut performance #663

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8 changes: 5 additions & 3 deletions src/drawing/text.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -84,15 +84,17 @@ pub fn draw_text_mut<C>(
let image_height = canvas.height() as i32;

layout_glyphs(scale, font, text, |g, bb| {
let bbx = x + bb.min.x.round() as i32;
let bby = y + bb.min.y.round() as i32;
g.draw(|gx, gy, gv| {
let image_x = gx as i32 + x + bb.min.x.round() as i32;
let image_y = gy as i32 + y + bb.min.y.round() as i32;
let gv = gv.clamp(0.0, 1.0);
let image_x = gx as i32 + bbx;
let image_y = gy as i32 + bby;

if (0..image_width).contains(&image_x) && (0..image_height).contains(&image_y) {
let image_x = image_x as u32;
let image_y = image_y as u32;
let pixel = canvas.get_pixel(image_x, image_y);
let gv = gv.clamp(0.0, 1.0);
let weighted_color = weighted_sum(pixel, color, 1.0 - gv, gv);
canvas.draw_pixel(image_x, image_y, weighted_color);
}
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