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Render: slide backgrounds are laid over white (#275) 

PowerPoint shows white around a background picture stretched into part of
the slide and under a see-through background colour. DeckCraft left those
areas transparent, which exports and the slide show draw black.

Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Brandon Thomas 2026-10-12 17:45:31 -04:00 committed by GitHub
parent 98ea8d3195
commit 39a8234633
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2 changed files with 26 additions and 0 deletions
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4
crates/render/src/lib.rs
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@ -592,6 +592,10 @@ impl Renderer {
let r = Rect::new(0.0, 0.0, f.pres.slide_size.width, f.pres.slide_size.height);
ctx.set_transform(view);
let path = r.to_path(0.1);
// PowerPoint lays every background over white: a picture stretched into part of the
// slide, or a see-through colour, leaves white around and under it.
ctx.set_paint(color(Rgba::WHITE, 1.0));
ctx.fill_path(&path);
paint::fill_path(ctx, rctx, &fill, ph, &path, r, view, FillMode::Norm, 1.0, f.pres);
self.bg = Some((fill, ph, view));
}

22
crates/render/src/tests.rs
View File

@ -610,3 +610,25 @@ fn a_shape_filled_with_the_background_shows_the_slide_background() {
let v = img.pixel(720, 270)[0] as i32;
assert!((v - 100).abs() <= 6, "{v}");
}
#[test]
fn a_background_is_laid_over_white() {
// A background picture stretched into the bottom-right quarter (fillRect l=50% t=50%), and a
// half-transparent colour: PowerPoint shows white around and under them, not transparency.
use deckcraft_model::style::{Fill, PictureFill, PictureMode};
let mut png = std::io::Cursor::new(Vec::new());
image::DynamicImage::ImageRgb8(image::RgbImage::from_pixel(4, 4, image::Rgb([0, 0, 200]))).write_to(&mut png, image::ImageFormat::Png).unwrap();
let mut p = deck_with(vec![]);
let media = p.add_media("bg.png", "image/png", png.into_inner());
let pf = PictureFill { media, mode: PictureMode::Stretch { fill_rect: [0.5, 0.5, 0.0, 0.0] }, ..Default::default() };
std::sync::Arc::make_mut(&mut p.slides[0]).background = Some(deckcraft_model::Background::Fill { fill: Fill::Picture(pf) });
let img = render_slide(&p, 0, &RenderOpts { scale: 0.5, ..Default::default() });
assert_eq!(img.pixel(20, 20), [255, 255, 255, 255], "white where the picture doesn't reach");
let q = img.pixel(400, 230);
assert!(q[2] > 190 && q[0] < 10 && q[3] == 255, "{q:?}");
let see_through = ColorRef::rgb(deckcraft_color::Rgba { r: 0, g: 0, b: 0, a: 128 });
std::sync::Arc::make_mut(&mut p.slides[0]).background = Some(deckcraft_model::Background::Fill { fill: Fill::solid(see_through) });
let img = render_slide(&p, 0, &RenderOpts { scale: 0.5, ..Default::default() });
let g = img.pixel(20, 20);
assert!(g[3] == 255 && (g[0] as i32 - 127).abs() <= 3, "half-transparent black over white is grey: {g:?}");
}