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use image::GenericImageView;
use crate::env::{ImageResource, ResourceId};
use crate::layout::*;
use crate::prelude::*;
/// `image`: Insert an image.
///
/// Supports PNG and JPEG files.
///
/// # Positional arguments
/// - Path to image file: of type `string`.
pub fn image(ctx: &mut EvalContext, args: &mut Args) -> Value {
let path = args.require::<Spanned<String>>(ctx, "path to image file");
let width = args.get(ctx, "width");
let height = args.get(ctx, "height");
if let Some(path) = path {
let loaded = ctx.env.resources.load(path.v, ImageResource::parse);
if let Some((res, img)) = loaded {
let dimensions = img.buf.dimensions();
ctx.push(NodeImage {
res,
dimensions,
width,
height,
align: ctx.state.align,
});
} else {
ctx.diag(error!(path.span, "failed to load image"));
}
}
Value::None
}
/// An image node.
#[derive(Debug, Clone, PartialEq)]
struct NodeImage {
/// The resource id of the image file.
res: ResourceId,
/// The pixel dimensions of the image.
dimensions: (u32, u32),
/// The fixed width, if any.
width: Option<Linear>,
/// The fixed height, if any.
height: Option<Linear>,
/// How to align this image node in its parent.
align: ChildAlign,
}
impl Layout for NodeImage {
fn layout(&self, _: &mut LayoutContext, areas: &Areas) -> Layouted {
let Areas { current, full, .. } = areas;
let pixel_width = self.dimensions.0 as f64;
let pixel_height = self.dimensions.1 as f64;
let pixel_ratio = pixel_width / pixel_height;
let width = self.width.map(|w| w.resolve(full.width));
let height = self.height.map(|w| w.resolve(full.height));
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) => {
let ratio = current.width / current.height;
if ratio < pixel_ratio && current.width.is_finite() {
Size::new(current.width, current.width / pixel_ratio)
} else if current.height.is_finite() {
// TODO: Fix issue with line spacing.
Size::new(current.height * pixel_ratio, current.height)
} else {
// Totally unbounded area, we have to make up something.
Size::new(Length::pt(pixel_width), Length::pt(pixel_height))
}
}
};
let mut frame = Frame::new(size);
frame.push(Point::ZERO, Element::Image(Image { res: self.res, size }));
Layouted::Frame(frame, self.align)
}
}
impl From<NodeImage> for NodeAny {
fn from(image: NodeImage) -> Self {
Self::new(image)
}
}
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