feat: Blurhash integration

Resolve #6559

src/client/components/img-with-blurhash.vue

@@ -0,0 +1,78 @@
+<template>
+<div class="xubzgfgb" :title="title">
+	<canvas ref="canvas" :width="size" :height="size" :title="title" v-if="!loaded"/>
+	<img v-if="src" :src="src" :title="title" :alt="alt" @load="onLoad"/>
+</div>
+</template>
+
+<script lang="ts">
+import Vue from 'vue';
+import { decode } from 'blurhash';
+
+export default Vue.extend({
+	props: {
+		src: {
+			type: String,
+			required: false,
+			default: null
+		},
+		hash: {
+			type: String,
+			required: true
+		},
+		alt: {
+			type: String,
+			required: false,
+			default: '',
+		},
+		title: {
+			type: String,
+			required: false,
+			default: null,
+		},
+		size: {
+			type: Number,
+			required: false,
+			default: 64
+		},
+	},
+
+	data() {
+		return {
+			loaded: false,
+		};
+	},
+
+	mounted() {
+		this.draw();
+	},
+
+	methods: {
+		draw() {
+			const pixels = decode(this.hash, this.size, this.size);
+			const ctx = (this.$refs.canvas as HTMLCanvasElement).getContext('2d');
+			const imageData = ctx!.createImageData(this.size, this.size);
+			imageData.data.set(pixels);
+			ctx!.putImageData(imageData, 0, 0);
+		},
+
+		onLoad() {
+			this.loaded = true;
+		}
+	}
+});
+</script>
+
+<style lang="scss" scoped>
+.xubzgfgb {
+	width: 100%;
+	height: 100%;
+
+	> canvas,
+	> img {
+		width: 100%;
+		height: 100%;
+		object-fit: cover;
+	}
+}
+</style>