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image: Ensure contrast for transparent images

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Determine if the image is transparent and has low
contrast with default background color. If so,
use a different background color.

Closes #31

Part-of: <https://gitlab.gnome.org/Incubator/loupe/-/merge_requests/151>
This commit is contained in:
Sophie Herold 2023-04-02 22:22:00 +02:00
parent 2e237d41e8
commit 7bf9baa581
4 changed files with 159 additions and 33 deletions
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7
src/decoder/tiling.rs
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@ -88,7 +88,9 @@ impl Tile {
// TODO: do not clip outer bounderies of the image
snapshot.push_clip(&area);
snapshot.append_color(&gdk::RGBA::new(0.118, 0.118, 0.118, 1.), &area);
if let Some(background_color) = &options.background_color {
snapshot.append_color(background_color, &area);
}
snapshot.append_scaled_texture(&self.texture, options.scaling_filter, &area_with_bleed);
snapshot.pop();
}
@ -173,6 +175,7 @@ impl Default for TiledImage {
pub struct RenderOptions {
pub scaling_filter: gsk::ScalingFilter,
pub scale_factor: i32,
pub background_color: Option<gdk::RGBA>,
}
impl TiledImage {
@ -402,6 +405,8 @@ impl RectExt for graphene::Rect {
}
}
/// We always store [`FrameBuffer`]s in an [`ArcSwap`].
/// This trait adds convenience functions for this.
pub trait FrameBufferExt {
fn push(&self, tile: Tile);
fn push_frame(&self, tile: Tile, dimensions: Coordinates, delay: Duration);