1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
|
<template>
<div ref="root" :class="['chromatic-ignore', $style.root, { [$style.cover]: cover }]" :title="title ?? ''">
<TransitionGroup
:duration="defaultStore.state.animation && props.transition?.duration || undefined"
:enterActiveClass="defaultStore.state.animation && props.transition?.enterActiveClass || undefined"
:leaveActiveClass="defaultStore.state.animation && (props.transition?.leaveActiveClass ?? $style.transition_leaveActive) || undefined"
:enterFromClass="defaultStore.state.animation && props.transition?.enterFromClass || undefined"
:leaveToClass="defaultStore.state.animation && props.transition?.leaveToClass || undefined"
:enterToClass="defaultStore.state.animation && props.transition?.enterToClass || undefined"
:leaveFromClass="defaultStore.state.animation && props.transition?.leaveFromClass || undefined"
>
<canvas v-show="hide" key="canvas" ref="canvas" :class="$style.canvas" :width="canvasWidth" :height="canvasHeight" :title="title ?? undefined"/>
<img v-show="!hide" key="img" ref="img" :height="imgHeight" :width="imgWidth" :class="$style.img" :src="src ?? undefined" :title="title ?? undefined" :alt="alt ?? undefined" loading="eager" decoding="async"/>
</TransitionGroup>
</div>
</template>
<script lang="ts">
import { $ref } from 'vue/macros';
import DrawBlurhash from '@/workers/draw-blurhash?worker';
import TestWebGL2 from '@/workers/test-webgl2?worker';
import { WorkerMultiDispatch } from '@/scripts/worker-multi-dispatch';
import { extractAvgColorFromBlurhash } from '@/scripts/extract-avg-color-from-blurhash';
const workerPromise = new Promise<WorkerMultiDispatch | null>(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') {
resolve(null);
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 {
resolve(null);
if (_DEV_) console.log('WebGL2 in worker is not supported...');
}
testWorker.terminate();
});
});
</script>
<script lang="ts" setup>
import { computed, nextTick, onMounted, onUnmounted, shallowRef, watch } from 'vue';
import { v4 as uuid } from 'uuid';
import { render } from 'buraha';
import { defaultStore } from '@/store';
const props = withDefaults(defineProps<{
transition?: {
duration?: number | { enter: number; leave: number; };
enterActiveClass?: string;
leaveActiveClass?: string;
enterFromClass?: string;
leaveToClass?: string;
enterToClass?: string;
leaveFromClass?: string;
} | null;
src?: string | null;
hash?: string;
alt?: string | null;
title?: string | null;
height?: number;
width?: number;
cover?: boolean;
forceBlurhash?: boolean;
}>(), {
transition: null,
src: null,
alt: '',
title: null,
height: 64,
width: 64,
cover: true,
forceBlurhash: false,
});
const viewId = uuid();
const canvas = shallowRef<HTMLCanvasElement>();
const root = shallowRef<HTMLDivElement>();
const img = shallowRef<HTMLImageElement>();
let loaded = $ref(false);
let canvasWidth = $ref(64);
let canvasHeight = $ref(64);
let imgWidth = $ref(props.width);
let imgHeight = $ref(props.height);
let bitmapTmp = $ref<CanvasImageSource | undefined>();
const hide = computed(() => !loaded || props.forceBlurhash);
function waitForDecode() {
if (props.src != null && props.src !== '') {
nextTick()
.then(() => img.value?.decode())
.then(() => {
loaded = true;
}, error => {
console.error('Error occured during decoding image', img.value, error);
throw Error(error);
});
} else {
loaded = false;
}
}
watch([() => props.width, () => props.height, root], () => {
const ratio = props.width / props.height;
if (ratio > 1) {
canvasWidth = Math.round(64 * ratio);
canvasHeight = 64;
} else {
canvasWidth = 64;
canvasHeight = Math.round(64 / ratio);
}
const clientWidth = root.value?.clientWidth ?? 300;
imgWidth = clientWidth;
imgHeight = 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 = bitmap;
return;
}
// canvasがあれば描画する
bitmapTmp = undefined;
const ctx = canvas.value.getContext('2d');
if (!ctx) return;
ctx.drawImage(bitmap, 0, 0, canvasWidth, canvasHeight);
}
async function draw() {
if (!canvas.value || props.hash == null) return;
const ctx = canvas.value.getContext('2d');
if (!ctx) return;
// avgColorでお茶をにごす
ctx.beginPath();
ctx.fillStyle = extractAvgColorFromBlurhash(props.hash) ?? '#888';
ctx.fillRect(0, 0, canvasWidth, canvasHeight);
const workers = await workerPromise;
if (workers) {
workers.postMessage(
{
id: viewId,
hash: props.hash,
width: canvasWidth,
height: canvasHeight,
},
undefined,
);
} else {
try {
const work = document.createElement('canvas');
work.width = canvasWidth;
work.height = canvasHeight;
render(props.hash, work);
ctx.drawImage(work, 0, 0, canvasWidth, canvasHeight);
} catch (error) {
console.error('Error occured during drawing blurhash', error);
}
}
}
function workerOnMessage(event: MessageEvent) {
if (event.data.id !== viewId) return;
drawImage(event.data.bitmap as ImageBitmap);
}
workerPromise.then(worker => {
if (worker) {
worker.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) {
drawImage(bitmapTmp);
}
waitForDecode();
});
onUnmounted(() => {
workerPromise.then(worker => {
worker?.removeListener(workerOnMessage);
});
});
</script>
<style lang="scss" module>
.transition_leaveActive {
position: absolute;
top: 0;
left: 0;
}
.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>
|
