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use super::*;
use crate::image::ImageId;
/// An image node.
#[derive(Debug, Hash)]
pub struct ImageNode {
/// The id of the image file.
pub id: ImageId,
/// The fixed width, if any.
pub width: Option<Linear>,
/// The fixed height, if any.
pub height: Option<Linear>,
}
impl InlineLevel for ImageNode {
fn layout(&self, ctx: &mut LayoutContext, space: Length, base: Size) -> Frame {
let img = ctx.images.get(self.id);
let pixel_size = Spec::new(img.width() as f64, img.height() as f64);
let pixel_ratio = pixel_size.x / pixel_size.y;
let width = self.width.map(|w| w.resolve(base.w));
let height = self.height.map(|w| w.resolve(base.h));
let size = match (width, height) {
(Some(width), Some(height)) => Size::new(width, height),
(Some(width), None) => Size::new(width, width / pixel_ratio),
(None, Some(height)) => Size::new(height * pixel_ratio, height),
(None, None) => {
if space.is_finite() {
// Fit to width.
Size::new(space, space / pixel_ratio)
} else {
// Unbounded width, we have to make up something,
// so it is 1pt per pixel.
pixel_size.map(Length::pt).to_size()
}
}
};
let mut frame = Frame::new(size, size.h);
frame.push(Point::zero(), Element::Image(self.id, size));
frame
}
}
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