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fix: alpha-blend glass panels instead of opaque overwrite
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Gabriel Kaszewski
2026-06-03 00:46:09 +02:00
parent c842ad6a55
commit 3f483f8f81
1 changed files with 11 additions and 6 deletions
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17
crates/adapters/wrapup-renderer/src/slides.rs
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@@ -145,7 +145,6 @@ impl SlideRenderer {
/// Draw a semi-transparent dark glass panel. /// Draw a semi-transparent dark glass panel.
fn draw_glass_panel(&self, canvas: &mut RgbaImage, x: i32, y: i32, pw: u32, ph: u32) { fn draw_glass_panel(&self, canvas: &mut RgbaImage, x: i32, y: i32, pw: u32, ph: u32) {
// clamp to canvas bounds
let x0 = x.max(0) as u32; let x0 = x.max(0) as u32;
let y0 = y.max(0) as u32; let y0 = y.max(0) as u32;
let x1 = (x as u32 + pw).min(canvas.width()); let x1 = (x as u32 + pw).min(canvas.width());
@@ -153,11 +152,17 @@ impl SlideRenderer {
if x1 <= x0 || y1 <= y0 { if x1 <= x0 || y1 <= y0 {
return; return;
} }
draw_filled_rect_mut( let alpha = GLASS[3] as f32 / 255.0;
canvas, let inv = 1.0 - alpha;
Rect::at(x0 as i32, y0 as i32).of_size(x1 - x0, y1 - y0), for py in y0..y1 {
GLASS, for px in x0..x1 {
); let bg = canvas.get_pixel(px, py);
let r = (GLASS[0] as f32 * alpha + bg[0] as f32 * inv) as u8;
let g = (GLASS[1] as f32 * alpha + bg[1] as f32 * inv) as u8;
let b = (GLASS[2] as f32 * alpha + bg[2] as f32 * inv) as u8;
canvas.put_pixel(px, py, Rgba([r, g, b, 255]));
}
}
} }
fn stamp_logo(&self, canvas: &mut RgbaImage) { fn stamp_logo(&self, canvas: &mut RgbaImage) {