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import "./Image.scss";
import { browser } from "$app/environment";
import { intersectionObserverSupport, lazyImageLoadingSupport } from "$lib/constants/support";
import classNames from "$lib/util/classNames";
import IntersectionObserver from "$lib/components/IntersectionObserver";
import warn from "$lib/util/warn";
import type { Loading, LazyLoading, Color, Sources, Srcset } from "./types";
export let height: undefined | number = undefined;
export let width: undefined | number = undefined;
export let src: string;
// Tuple of [src, width]
const getSrcsetAttr = ([defaultSrc, ...widths]: Srcset) =>
[
...(widths ?? []).flatMap(([source, sourceWidth]) =>
!width || width >= sourceWidth ? [`${source} ${sourceWidth}w`] : []
),
defaultSrc,
].join(", ");
export let sources: Sources = [];
export let alt: string;
export let loading: Loading = "lazy";
export let blurhash: undefined | string = undefined;
export let mean: undefined | Color = undefined;
let className: string | undefined = undefined;
export { className as class };
export let imageClass: string | undefined = undefined;
const getLazyLoadingType = (
loading: Loading,
lazyImageLoadingSupport: boolean,
intersectionObserverSupport: boolean,
explicitLazyLoadingType?: LazyLoading
): LazyLoading => {
if (explicitLazyLoadingType) return explicitLazyLoadingType;
if (loading !== "lazy") return "none";
if (lazyImageLoadingSupport) return "native";
if (intersectionObserverSupport) return "intersectionObserver";
return "none";
};
// Used to set the lazy loading type explicitly in Storybook
let explicitLazyLoadingType: LazyLoading | undefined = undefined;
export { explicitLazyLoadingType as lazyLoadingType };
let lazyLoadingType: LazyLoading;
$: lazyLoadingType = getLazyLoadingType(
loading,
lazyImageLoadingSupport,
intersectionObserverSupport,
explicitLazyLoadingType
);
if (!width || !height) warn("image width or height was missing!");
$: decoding = loading === "lazy" ? ("async" as const) : ("auto" as const);
const canvasSize = 32;
let thisBg: HTMLCanvasElement;
let thisContainer: HTMLDivElement;
let imageLoaded = false;
$: if (!src) imageLoaded = false;
let intersecting = false;
const withNoSrcProp = {};
let srcProps = withNoSrcProp;
$: withSrcProp = { src };
$: if (!src) {
srcProps = withNoSrcProp;
} else if (loading === "eager") {
srcProps = withSrcProp;
} else if (!browser) {
srcProps = withNoSrcProp;
} else if (lazyLoadingType === "native" || lazyLoadingType === "none" || intersecting) {
srcProps = withSrcProp;
} else {
srcProps = withNoSrcProp;
}
$: imageLoadClass = imageLoaded
? "ldaf-img__loaded"
: src
? "ldaf-img__loading"
: "ldaf-img__unloaded";
// This theoretically shouldn't be needed since the BlurhashRenderer script will have already run and
// drawn the blurhash before Svelte has mounted and this runs. Unfortunately, when Svelte first
// runs the component code it does something (not sure what) that clears the canvas, which
// flashes the average-color background until the image loads. This line fixes
// that. Unfortunately this does not solve the problem of drawing the blurhashes when the
// BlurhashRenderer has been omitted, since this relies on the window global that is set by that
// script.
$: if (blurhash && thisBg && window.drawBlurhash) {
window.drawBlurhash(thisBg, blurhash);
}
const imgProps = { class: imageClass, width, height, border: 0, ...$$restProps };
</script>
<IntersectionObserver
target={thisContainer}
once={true}
on:intersect={() => (intersecting = true)}
enabled={lazyLoadingType === "intersectionObserver"}
>
<div
role="img"
aria-label={alt}
class={classNames(
"ldaf-img",
"ldaf-img__container",
loading === "eager" && "ldaf-img__eager",
className
)}
bind:this={thisContainer}
>
{#if loading === "lazy"}
<noscript>
<img {...imgProps} class="ldaf-img__backup-img" {src} alt="" />
</noscript>
{/if}
<picture>
{#each sources as { media, type, srcset }}
<source {media} {type} srcset={getSrcsetAttr(srcset)} />
{/each}
<img
{...imgProps}
alt=""
class={classNames("ldaf-img__img", imageLoadClass, imageClass)}
on:load={() => (imageLoaded = true)}
{loading}
{decoding}
{...srcProps}
/>
</picture>
{#if blurhash}
<canvas
class="ldaf-img__blur-bg"
width={canvasSize}
height={canvasSize}
data-blurhash={blurhash}
bind:this={thisBg}
/>
{/if}
{#if mean}
<div
class="ldaf-img__color-bg"
style={`background-color: rgb(${Math.round(mean.r)}, ${Math.round(mean.g)}, ${Math.round(
mean.b
)});`}
/>
{/if}
</div>
</IntersectionObserver>
|