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use std::io::Cursor;
use image::io::Reader;
use image::GenericImageView;
use crate::env::ResourceId;
use crate::layout::*;
use crate::prelude::*;
/// `image`: Insert an image.
///
/// # Positional arguments
/// - The path to the image (string)
///
/// Supports PNG and JPEG files.
pub fn image(mut args: Args, ctx: &mut EvalContext) -> Value {
let path = args.need::<_, Spanned<String>>(ctx, 0, "path");
let width = args.get::<_, Linear>(ctx, "width");
let height = args.get::<_, Linear>(ctx, "height");
if let Some(path) = path {
let mut env = ctx.env.borrow_mut();
let loaded = env.resources.load(path.v, |data| {
Reader::new(Cursor::new(data))
.with_guessed_format()
.ok()
.and_then(|reader| reader.decode().ok())
});
if let Some((res, buf)) = loaded {
let dimensions = buf.dimensions();
drop(env);
ctx.push(Image {
res,
dimensions,
width,
height,
align: ctx.state.align,
});
} else {
drop(env);
ctx.diag(error!(path.span, "failed to load image"));
}
}
Value::None
}
/// An image node.
#[derive(Debug, Clone, PartialEq)]
struct Image {
/// 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: BoxAlign,
}
impl Layout for Image {
fn layout(&self, _: &mut LayoutContext, areas: &Areas) -> Layouted {
let Area { rem, full } = areas.current;
let pixel_ratio = (self.dimensions.0 as f64) / (self.dimensions.1 as f64);
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 = rem.width / rem.height;
if ratio < pixel_ratio {
Size::new(rem.width, rem.width / pixel_ratio)
} else {
// TODO: Fix issue with line spacing.
Size::new(rem.height * pixel_ratio, rem.height)
}
}
};
let mut boxed = BoxLayout::new(size);
boxed.push(
Point::ZERO,
LayoutElement::Image(ImageElement { res: self.res, size }),
);
Layouted::Layout(boxed, self.align)
}
}
impl From<Image> for LayoutNode {
fn from(image: Image) -> Self {
Self::dynamic(image)
}
}
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