Create EmImgWithBlurhash.vue
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syuilo
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<!--
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SPDX-FileCopyrightText: syuilo and misskey-project
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SPDX-License-Identifier: AGPL-3.0-only
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-->
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<template>
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<div ref="root" :class="['chromatic-ignore', $style.root, { [$style.cover]: cover }]" :title="title ?? ''">
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<TransitionGroup
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:duration="defaultStore.state.animation && props.transition?.duration || undefined"
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:enterActiveClass="defaultStore.state.animation && props.transition?.enterActiveClass || undefined"
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:leaveActiveClass="defaultStore.state.animation && (props.transition?.leaveActiveClass ?? $style.transition_leaveActive) || undefined"
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:enterFromClass="defaultStore.state.animation && props.transition?.enterFromClass || undefined"
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:leaveToClass="defaultStore.state.animation && props.transition?.leaveToClass || undefined"
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:enterToClass="defaultStore.state.animation && props.transition?.enterToClass || undefined"
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:leaveFromClass="defaultStore.state.animation && props.transition?.leaveFromClass || undefined"
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>
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<canvas v-show="hide" key="canvas" ref="canvas" :class="$style.canvas" :width="canvasWidth" :height="canvasHeight" :title="title ?? undefined" tabindex="-1"/>
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<img v-show="!hide" key="img" ref="img" :height="imgHeight ?? undefined" :width="imgWidth ?? undefined" :class="$style.img" :src="src ?? undefined" :title="title ?? undefined" :alt="alt ?? undefined" loading="eager" decoding="async" tabindex="-1"/>
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</TransitionGroup>
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</div>
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</template>
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<script lang="ts">
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import DrawBlurhash from '@/workers/draw-blurhash?worker';
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import TestWebGL2 from '@/workers/test-webgl2?worker';
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import { WorkerMultiDispatch } from '@/scripts/worker-multi-dispatch.js';
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import { extractAvgColorFromBlurhash } from '@/scripts/extract-avg-color-from-blurhash.js';
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const canvasPromise = new Promise<WorkerMultiDispatch | HTMLCanvasElement>(resolve => {
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// テスト環境で Web Worker インスタンスは作成できない
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if (import.meta.env.MODE === 'test') {
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const canvas = document.createElement('canvas');
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canvas.width = 64;
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canvas.height = 64;
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resolve(canvas);
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return;
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}
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const testWorker = new TestWebGL2();
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testWorker.addEventListener('message', event => {
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if (event.data.result) {
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const workers = new WorkerMultiDispatch(
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() => new DrawBlurhash(),
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Math.min(navigator.hardwareConcurrency - 1, 4),
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);
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resolve(workers);
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if (_DEV_) console.log('WebGL2 in worker is supported!');
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} else {
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const canvas = document.createElement('canvas');
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canvas.width = 64;
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canvas.height = 64;
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resolve(canvas);
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if (_DEV_) console.log('WebGL2 in worker is not supported...');
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}
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testWorker.terminate();
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});
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});
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</script>
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<script lang="ts" setup>
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import { computed, nextTick, onMounted, onUnmounted, shallowRef, watch, ref } from 'vue';
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import { v4 as uuid } from 'uuid';
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import { render } from 'buraha';
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const props = withDefaults(defineProps<{
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transition?: {
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duration?: number | { enter: number; leave: number; };
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enterActiveClass?: string;
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leaveActiveClass?: string;
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enterFromClass?: string;
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leaveToClass?: string;
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enterToClass?: string;
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leaveFromClass?: string;
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} | null;
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src?: string | null;
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hash?: string | null;
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alt?: string | null;
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title?: string | null;
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height?: number;
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width?: number;
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cover?: boolean;
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forceBlurhash?: boolean;
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onlyAvgColor?: boolean; // 軽量化のためにBlurhashを使わずに平均色だけを描画
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}>(), {
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transition: null,
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src: null,
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alt: '',
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title: null,
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height: 64,
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width: 64,
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cover: true,
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forceBlurhash: false,
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onlyAvgColor: false,
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});
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const viewId = uuid();
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const canvas = shallowRef<HTMLCanvasElement>();
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const root = shallowRef<HTMLDivElement>();
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const img = shallowRef<HTMLImageElement>();
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const loaded = ref(false);
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const canvasWidth = ref(64);
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const canvasHeight = ref(64);
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const imgWidth = ref(props.width);
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const imgHeight = ref(props.height);
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const bitmapTmp = ref<CanvasImageSource | undefined>();
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const hide = computed(() => !loaded.value || props.forceBlurhash);
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function waitForDecode() {
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if (props.src != null && props.src !== '') {
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nextTick()
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.then(() => img.value?.decode())
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.then(() => {
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loaded.value = true;
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}, error => {
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console.log('Error occurred during decoding image', img.value, error);
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});
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} else {
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loaded.value = false;
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}
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}
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watch([() => props.width, () => props.height, root], () => {
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const ratio = props.width / props.height;
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if (ratio > 1) {
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canvasWidth.value = Math.round(64 * ratio);
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canvasHeight.value = 64;
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} else {
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canvasWidth.value = 64;
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canvasHeight.value = Math.round(64 / ratio);
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}
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const clientWidth = root.value?.clientWidth ?? 300;
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imgWidth.value = clientWidth;
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imgHeight.value = Math.round(clientWidth / ratio);
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}, {
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immediate: true,
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});
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function drawImage(bitmap: CanvasImageSource) {
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// canvasがない（mountedされていない）場合はTmpに保存しておく
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if (!canvas.value) {
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bitmapTmp.value = bitmap;
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return;
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}
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// canvasがあれば描画する
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bitmapTmp.value = undefined;
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const ctx = canvas.value.getContext('2d');
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if (!ctx) return;
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ctx.drawImage(bitmap, 0, 0, canvasWidth.value, canvasHeight.value);
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}
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function drawAvg() {
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if (!canvas.value) return;
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const color = (props.hash != null && extractAvgColorFromBlurhash(props.hash)) || '#888';
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const ctx = canvas.value.getContext('2d');
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if (!ctx) return;
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// avgColorでお茶をにごす
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ctx.beginPath();
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ctx.fillStyle = color;
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ctx.fillRect(0, 0, canvasWidth.value, canvasHeight.value);
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}
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async function draw() {
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if (import.meta.env.MODE === 'test' && props.hash == null) return;
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drawAvg();
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if (props.hash == null) return;
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if (props.onlyAvgColor) return;
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const work = await canvasPromise;
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if (work instanceof WorkerMultiDispatch) {
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work.postMessage(
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{
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id: viewId,
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hash: props.hash,
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},
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undefined,
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);
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} else {
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try {
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render(props.hash, work);
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drawImage(work);
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} catch (error) {
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console.error('Error occurred during drawing blurhash', error);
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}
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}
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}
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function workerOnMessage(event: MessageEvent) {
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if (event.data.id !== viewId) return;
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drawImage(event.data.bitmap as ImageBitmap);
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}
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canvasPromise.then(work => {
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if (work instanceof WorkerMultiDispatch) {
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work.addListener(workerOnMessage);
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}
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draw();
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});
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watch(() => props.src, () => {
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waitForDecode();
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});
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watch(() => props.hash, () => {
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draw();
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});
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onMounted(() => {
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// drawImageがmountedより先に呼ばれている場合はここで描画する
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if (bitmapTmp.value) {
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drawImage(bitmapTmp.value);
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}
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waitForDecode();
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});
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onUnmounted(() => {
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canvasPromise.then(work => {
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if (work instanceof WorkerMultiDispatch) {
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work.removeListener(workerOnMessage);
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}
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});
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});
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</script>
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<style lang="scss" module>
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.transition_leaveActive {
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position: absolute;
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top: 0;
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left: 0;
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}
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.root {
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position: relative;
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width: 100%;
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height: 100%;
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&.cover {
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> .canvas,
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> .img {
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object-fit: cover;
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}
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}
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}
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.canvas,
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.img {
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display: block;
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width: 100%;
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height: 100%;
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}
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.canvas {
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object-fit: contain;
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}
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.img {
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object-fit: contain;
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}
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</style>
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