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