feat(frontend): 画像編集機能 (#16121)

* wip

* wip

* wip

* wip

* Update watermarker.ts

* wip

* wip

* Update watermarker.ts

* Update MkUploaderDialog.vue

* wip

* Update ImageEffector.ts

* Update ImageEffector.ts

* wip

* wip

* wip

* wip

* wip

* wip

* Update MkRange.vue

* Update MkRange.vue

* wip

* wip

* Update MkImageEffectorDialog.vue

* Update MkImageEffectorDialog.Layer.vue

* wip

* Update zoomLines.ts

* Update zoomLines.ts

* wip

* wip

* Update ImageEffector.ts

* wip

* Update ImageEffector.ts

* wip

* Update ImageEffector.ts

* swip

* wip

* Update ImageEffector.ts

* wop

* Update MkUploaderDialog.vue

* Update ImageEffector.ts

* wip

* wip

* wip

* Update def.ts

* Update def.ts

* test

* test

* Update manager.ts

* Update manager.ts

* Update manager.ts

* Update manager.ts

* Update MkImageEffectorDialog.vue

* wip

* use WEBGL_lose_context

* wip

* Update MkUploaderDialog.vue

* Update drive.vue

* wip

* Update MkUploaderDialog.vue

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

* wip

7 files changed, 1493 insertions, 73 deletions

diff --git a/packages/frontend/src/components/MkImageEffectorDialog.Layer.vue b/packages/frontend/src/components/MkImageEffectorDialog.Layer.vue
new file mode 100644
index 0000000000..0312017d86
--- /dev/null
+++ b/packages/frontend/src/components/MkImageEffectorDialog.Layer.vue
@@ -0,0 +1,78 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<MkFolder :defaultOpen="true" :canPage="false">
+	<template #label>{{ fx.name }}</template>
+	<template #footer>
+		<div class="_buttons">
+			<MkButton iconOnly @click="emit('del')"><i class="ti ti-trash"></i></MkButton>
+			<MkButton iconOnly @click="emit('swapUp')"><i class="ti ti-arrow-up"></i></MkButton>
+			<MkButton iconOnly @click="emit('swapDown')"><i class="ti ti-arrow-down"></i></MkButton>
+		</div>
+	</template>
+
+	<div :class="$style.root" class="_gaps">
+		<div v-for="[k, v] in Object.entries(fx.params)" :key="k">
+			<MkSwitch v-if="v.type === 'boolean'" v-model="layer.params[k]">
+				<template #label>{{ k }}</template>
+			</MkSwitch>
+			<MkRange v-else-if="v.type === 'number'" v-model="layer.params[k]" continuousUpdate :min="v.min" :max="v.max" :step="v.step">
+				<template #label>{{ k }}</template>
+			</MkRange>
+			<MkRadios v-else-if="v.type === 'number:enum'" v-model="layer.params[k]">
+				<template #label>{{ k }}</template>
+				<option v-for="item in v.enum" :value="item.value">{{ item.label }}</option>
+			</MkRadios>
+			<div v-else-if="v.type === 'seed'">
+				<MkRange v-model="layer.params[k]" continuousUpdate type="number" :min="0" :max="10000" :step="1">
+					<template #label>{{ k }}</template>
+				</MkRange>
+			</div>
+			<MkInput v-else-if="v.type === 'color'" :modelValue="`#${(layer.params[k][0] * 255).toString(16).padStart(2, '0')}${(layer.params[k][1] * 255).toString(16).padStart(2, '0')}${(layer.params[k][2] * 255).toString(16).padStart(2, '0')}`" type="color" @update:modelValue="v => { const c = v.slice(1).match(/.{2}/g)?.map(x => parseInt(x, 16) / 255); if (c) layer.params[k] = c; }">
+				<template #label>{{ k }}</template>
+			</MkInput>
+		</div>
+	</div>
+</MkFolder>
+</template>
+
+<script setup lang="ts">
+import { ref, useTemplateRef, watch, onMounted, onUnmounted } from 'vue';
+import type { ImageEffectorLayer } from '@/utility/image-effector/ImageEffector.js';
+import { i18n } from '@/i18n.js';
+import { ImageEffector } from '@/utility/image-effector/ImageEffector.js';
+import MkFolder from '@/components/MkFolder.vue';
+import MkButton from '@/components/MkButton.vue';
+import MkInput from '@/components/MkInput.vue';
+import MkRadios from '@/components/MkRadios.vue';
+import MkSwitch from '@/components/MkSwitch.vue';
+import MkRange from '@/components/MkRange.vue';
+import FormSlot from '@/components/form/slot.vue';
+import MkPositionSelector from '@/components/MkPositionSelector.vue';
+import * as os from '@/os.js';
+import { selectFile } from '@/utility/drive.js';
+import { misskeyApi } from '@/utility/misskey-api.js';
+import { prefer } from '@/preferences.js';
+import { FXS } from '@/utility/image-effector/fxs.js';
+
+const layer = defineModel<ImageEffectorLayer>('layer', { required: true });
+const fx = FXS.find((fx) => fx.id === layer.value.fxId);
+if (fx == null) {
+	throw new Error(`Unrecognized effect: ${layer.value.fxId}`);
+}
+
+const emit = defineEmits<{
+	(e: 'del'): void;
+	(e: 'swapUp'): void;
+	(e: 'swapDown'): void;
+}>();
+</script>
+
+<style module>
+.root {
+
+}
+</style>
diff --git a/packages/frontend/src/components/MkImageEffectorDialog.vue b/packages/frontend/src/components/MkImageEffectorDialog.vue
new file mode 100644
index 0000000000..997dd4d528
--- /dev/null
+++ b/packages/frontend/src/components/MkImageEffectorDialog.vue
@@ -0,0 +1,302 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<MkModalWindow
+	ref="dialog"
+	:width="1000"
+	:height="600"
+	:scroll="false"
+	:withOkButton="true"
+	@close="cancel()"
+	@ok="save()"
+	@closed="emit('closed')"
+>
+	<template #header><i class="ti ti-sparkles"></i> {{ i18n.ts._imageEffector.title }}</template>
+
+	<div :class="$style.root">
+		<div :class="$style.container">
+			<div :class="$style.preview">
+				<canvas ref="canvasEl" :class="$style.previewCanvas"></canvas>
+				<div :class="$style.previewContainer">
+					<div class="_acrylic" :class="$style.previewTitle">{{ i18n.ts.preview }}</div>
+					<div class="_acrylic" :class="$style.previewControls">
+						<button class="_button" :class="[$style.previewControlsButton, !enabled ? $style.active : null]" @click="enabled = false">Before</button>
+						<button class="_button" :class="[$style.previewControlsButton, enabled ? $style.active : null]" @click="enabled = true">After</button>
+					</div>
+				</div>
+			</div>
+			<div :class="$style.controls">
+				<div class="_spacer _gaps">
+					<XLayer
+						v-for="(layer, i) in layers"
+						:key="layer.id"
+						v-model:layer="layers[i]"
+						@del="onLayerDelete(layer)"
+						@swapUp="onLayerSwapUp(layer)"
+						@swapDown="onLayerSwapDown(layer)"
+					></XLayer>
+
+					<MkButton rounded primary style="margin: 0 auto;" @click="addEffect"><i class="ti ti-plus"></i> {{ i18n.ts._imageEffector.addEffect }}</MkButton>
+				</div>
+			</div>
+		</div>
+	</div>
+</MkModalWindow>
+</template>
+
+<script setup lang="ts">
+import { ref, useTemplateRef, watch, onMounted, onUnmounted, reactive, nextTick } from 'vue';
+import type { ImageEffectorLayer } from '@/utility/image-effector/ImageEffector.js';
+import { i18n } from '@/i18n.js';
+import { ImageEffector } from '@/utility/image-effector/ImageEffector.js';
+import MkModalWindow from '@/components/MkModalWindow.vue';
+import MkSelect from '@/components/MkSelect.vue';
+import MkButton from '@/components/MkButton.vue';
+import MkInput from '@/components/MkInput.vue';
+import XLayer from '@/components/MkImageEffectorDialog.Layer.vue';
+import * as os from '@/os.js';
+import { deepClone } from '@/utility/clone.js';
+import { FXS } from '@/utility/image-effector/fxs.js';
+import { genId } from '@/utility/id.js';
+
+const props = defineProps<{
+	image: File;
+}>();
+
+const emit = defineEmits<{
+	(ev: 'ok', image: File): void;
+	(ev: 'cancel'): void;
+	(ev: 'closed'): void;
+}>();
+
+const dialog = useTemplateRef('dialog');
+
+async function cancel() {
+	if (layers.length > 0) {
+		const { canceled } = await os.confirm({
+			text: i18n.ts._imageEffector.discardChangesConfirm,
+		});
+		if (canceled) return;
+	}
+
+	emit('cancel');
+	dialog.value?.close();
+}
+
+const layers = reactive<ImageEffectorLayer[]>([]);
+
+watch(layers, async () => {
+	if (renderer != null) {
+		renderer.setLayers(layers);
+	}
+}, { deep: true });
+
+function addEffect(ev: MouseEvent) {
+	os.popupMenu(FXS.filter(fx => fx.id !== 'watermarkPlacement').map((fx) => ({
+		text: fx.name,
+		action: () => {
+			layers.push({
+				id: genId(),
+				fxId: fx.id,
+				params: Object.fromEntries(Object.entries(fx.params).map(([k, v]) => [k, v.default])),
+			});
+		},
+	})), ev.currentTarget ?? ev.target);
+}
+
+function onLayerSwapUp(layer: ImageEffectorLayer) {
+	const index = layers.indexOf(layer);
+	if (index > 0) {
+		layers.splice(index, 1);
+		layers.splice(index - 1, 0, layer);
+	}
+}
+
+function onLayerSwapDown(layer: ImageEffectorLayer) {
+	const index = layers.indexOf(layer);
+	if (index < layers.length - 1) {
+		layers.splice(index, 1);
+		layers.splice(index + 1, 0, layer);
+	}
+}
+
+function onLayerDelete(layer: ImageEffectorLayer) {
+	const index = layers.indexOf(layer);
+	if (index !== -1) {
+		layers.splice(index, 1);
+	}
+}
+
+const canvasEl = useTemplateRef('canvasEl');
+
+let renderer: ImageEffector | null = null;
+let imageBitmap: ImageBitmap | null = null;
+
+onMounted(async () => {
+	if (canvasEl.value == null) return;
+
+	const closeWaiting = os.waiting();
+
+	await nextTick(); // waitingがレンダリングされるまで待つ
+
+	imageBitmap = await window.createImageBitmap(props.image);
+
+	const MAX_W = 1000;
+	const MAX_H = 1000;
+	let w = imageBitmap.width;
+	let h = imageBitmap.height;
+
+	if (w > MAX_W || h > MAX_H) {
+		const scale = Math.min(MAX_W / w, MAX_H / h);
+		w *= scale;
+		h *= scale;
+	}
+
+	renderer = new ImageEffector({
+		canvas: canvasEl.value,
+		renderWidth: w,
+		renderHeight: h,
+		image: imageBitmap,
+		fxs: FXS,
+	});
+
+	await renderer.setLayers(layers);
+
+	renderer.render();
+
+	closeWaiting();
+});
+
+onUnmounted(() => {
+	if (renderer != null) {
+		renderer.destroy();
+		renderer = null;
+	}
+	if (imageBitmap != null) {
+		imageBitmap.close();
+		imageBitmap = null;
+	}
+});
+
+async function save() {
+	if (layers.length === 0 || renderer == null || imageBitmap == null || canvasEl.value == null) {
+		cancel();
+		return;
+	}
+
+	const closeWaiting = os.waiting();
+
+	await nextTick(); // waitingがレンダリングされるまで待つ
+
+	renderer.changeResolution(imageBitmap.width, imageBitmap.height); // 本番レンダリングのためオリジナル画質に戻す
+	renderer.render(); // toBlobの直前にレンダリングしないと何故か壊れる
+	canvasEl.value.toBlob((blob) => {
+		emit('ok', new File([blob!], `image-${Date.now()}.png`, { type: 'image/png' }));
+		dialog.value?.close();
+		closeWaiting();
+	}, 'image/png');
+}
+
+const enabled = ref(true);
+watch(enabled, () => {
+	if (renderer != null) {
+		if (enabled.value) {
+			renderer.setLayers(layers);
+		} else {
+			renderer.setLayers([]);
+		}
+		renderer.render();
+	}
+});
+</script>
+
+<style module>
+.root {
+	container-type: inline-size;
+	height: 100%;
+}
+
+.container {
+	height: 100%;
+	display: grid;
+	grid-template-columns: 1fr 400px;
+}
+
+.preview {
+	position: relative;
+	background-color: var(--MI_THEME-bg);
+	background-size: auto auto;
+	background-image: repeating-linear-gradient(135deg, transparent, transparent 6px, var(--MI_THEME-panel) 6px, var(--MI_THEME-panel) 12px);
+}
+
+.previewContainer {
+	display: flex;
+	flex-direction: column;
+	height: 100%;
+	user-select: none;
+	-webkit-user-drag: none;
+}
+
+.previewTitle {
+	position: absolute;
+	z-index: 100;
+	top: 8px;
+	left: 8px;
+	padding: 6px 10px;
+	border-radius: 6px;
+	font-size: 85%;
+}
+
+.previewControls {
+	position: absolute;
+	z-index: 100;
+	bottom: 8px;
+	right: 8px;
+	display: flex;
+	align-items: center;
+	gap: 8px;
+	padding: 6px 10px;
+	border-radius: 6px;
+}
+
+.previewControlsButton {
+	&.active {
+		color: var(--MI_THEME-accent);
+	}
+}
+
+.previewSpinner {
+	position: absolute;
+	top: 50%;
+	left: 50%;
+	transform: translate(-50%, -50%);
+	pointer-events: none;
+	user-select: none;
+	-webkit-user-drag: none;
+}
+
+.previewCanvas {
+	position: absolute;
+	top: 0;
+	left: 0;
+	width: 100%;
+	height: 100%;
+	padding: 20px;
+	box-sizing: border-box;
+	object-fit: contain;
+}
+
+.controls {
+	overflow-y: scroll;
+}
+
+@container (max-width: 800px) {
+	.container {
+		grid-template-columns: 1fr;
+		grid-template-rows: 1fr 1fr;
+	}
+}
+</style>
diff --git a/packages/frontend/src/components/MkPositionSelector.vue b/packages/frontend/src/components/MkPositionSelector.vue
new file mode 100644
index 0000000000..002950cdf1
--- /dev/null
+++ b/packages/frontend/src/components/MkPositionSelector.vue
@@ -0,0 +1,53 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div :class="[$style.root]">
+	<div :class="$style.items">
+		<button class="_button" :class="[$style.item, x === 'left' && y === 'top' ? $style.active : null]" @click="() => { x = 'left'; y = 'top'; }"><i class="ti ti-align-box-left-top"></i></button>
+		<button class="_button" :class="[$style.item, x === 'center' && y === 'top' ? $style.active : null]" @click="() => { x = 'center'; y = 'top'; }"><i class="ti ti-align-box-center-top"></i></button>
+		<button class="_button" :class="[$style.item, x === 'right' && y === 'top' ? $style.active : null]" @click="() => { x = 'right'; y = 'top'; }"><i class="ti ti-align-box-right-top"></i></button>
+		<button class="_button" :class="[$style.item, x === 'left' && y === 'center' ? $style.active : null]" @click="() => { x = 'left'; y = 'center'; }"><i class="ti ti-align-box-left-middle"></i></button>
+		<button class="_button" :class="[$style.item, x === 'center' && y === 'center' ? $style.active : null]" @click="() => { x = 'center'; y = 'center'; }"><i class="ti ti-align-box-center-middle"></i></button>
+		<button class="_button" :class="[$style.item, x === 'right' && y === 'center' ? $style.active : null]" @click="() => { x = 'right'; y = 'center'; }"><i class="ti ti-align-box-right-middle"></i></button>
+		<button class="_button" :class="[$style.item, x === 'left' && y === 'bottom' ? $style.active : null]" @click="() => { x = 'left'; y = 'bottom'; }"><i class="ti ti-align-box-left-bottom"></i></button>
+		<button class="_button" :class="[$style.item, x === 'center' && y === 'bottom' ? $style.active : null]" @click="() => { x = 'center'; y = 'bottom'; }"><i class="ti ti-align-box-center-bottom"></i></button>
+		<button class="_button" :class="[$style.item, x === 'right' && y === 'bottom' ? $style.active : null]" @click="() => { x = 'right'; y = 'bottom'; }"><i class="ti ti-align-box-right-bottom"></i></button>
+	</div>
+</div>
+</template>
+
+<script lang="ts" setup>
+import { } from 'vue';
+
+const x = defineModel<string>('x', { default: 'center' });
+const y = defineModel<string>('y', { default: 'center' });
+</script>
+
+<style lang="scss" module>
+.root {
+	position: relative;
+}
+
+.items {
+	display: grid;
+	grid-template-columns: repeat(3, 1fr);
+	grid-template-rows: repeat(3, 1fr);
+	gap: 4px;
+	border-radius: 8px;
+	overflow: clip;
+}
+
+.item {
+	height: 32px;
+	background: var(--MI_THEME-panel);
+	border-radius: 4px;
+
+	&.active {
+		background: var(--MI_THEME-accentedBg);
+		color: var(--MI_THEME-accent);
+	}
+}
+</style>
diff --git a/packages/frontend/src/components/MkRange.vue b/packages/frontend/src/components/MkRange.vue
index f36e68b687..9a6a207c74 100644
--- a/packages/frontend/src/components/MkRange.vue
+++ b/packages/frontend/src/components/MkRange.vue
@@ -12,7 +12,12 @@ SPDX-License-Identifier: AGPL-3.0-only
 		<slot name="prefix"></slot>
 		<div ref="containerEl" class="container">
 			<div class="track">
-				<div class="highlight" :style="{ width: (steppedRawValue * 100) + '%' }"></div>
+				<div class="highlight right" :style="{ width: ((steppedRawValue - minRatio) * 100) + '%', left: (Math.abs(Math.min(0, min)) / (max + Math.abs(Math.min(0, min)))) * 100 + '%' }">
+					<div class="shine right"></div>
+				</div>
+				<div class="highlight left" :style="{ width: ((minRatio - steppedRawValue) * 100) + '%', left: (steppedRawValue) * 100 + '%' }">
+					<div class="shine left"></div>
+				</div>
 			</div>
 			<div v-if="steps && showTicks" class="ticks">
 				<div v-for="i in (steps + 1)" class="tick" :style="{ left: (((i - 1) / steps) * 100) + '%' }"></div>
@@ -24,7 +29,9 @@ SPDX-License-Identifier: AGPL-3.0-only
 				@mouseenter.passive="onMouseenter"
 				@mousedown="onMousedown"
 				@touchstart="onMousedown"
-			></div>
+			>
+				<div class="thumbInner"></div>
+			</div>
 		</div>
 		<slot name="suffix"></slot>
 	</div>
@@ -63,6 +70,9 @@ const emit = defineEmits<{
 const containerEl = useTemplateRef('containerEl');
 const thumbEl = useTemplateRef('thumbEl');
 
+const maxRatio = computed(() => Math.abs(props.max) / (props.max + Math.abs(Math.min(0, props.min))));
+const minRatio = computed(() => Math.abs(Math.min(0, props.min)) / (props.max + Math.abs(Math.min(0, props.min))));
+
 const rawValue = ref((props.modelValue - props.min) / (props.max - props.min));
 const steppedRawValue = computed(() => {
 	if (props.step) {
@@ -222,15 +232,17 @@ function onMousedown(ev: MouseEvent | TouchEvent) {
 		}
 	}
 
-	$thumbHeight: 20px;
-	$thumbWidth: 20px;
+	$thumbHeight: 32px;
+	$thumbWidth: 32px;
+	$thumbInnerHeight: 19px;
+	$thumbInnerWidth: 19px;
 
 	> .body {
 		display: flex;
 		align-items: center;
 		justify-content: center;
 		gap: 8px;
-		padding: 7px 12px;
+		padding: 0px 4px;
 		background: var(--MI_THEME-panel);
 		border: solid 1px var(--MI_THEME-panel);
 		border-radius: 6px;
@@ -256,10 +268,30 @@ function onMousedown(ev: MouseEvent | TouchEvent) {
 				> .highlight {
 					position: absolute;
 					top: 0;
-					left: 0;
 					height: 100%;
-					background: var(--MI_THEME-accent);
-					opacity: 0.5;
+					background: color(from var(--MI_THEME-buttonGradateA) srgb r g b / 0.5);
+					overflow: clip;
+
+					> .shine {
+						position: absolute;
+						top: 0;
+						width: 64px;
+						height: 100%;
+					}
+				}
+
+				> .highlight.right {
+					> .shine.right {
+						right: calc(#{$thumbInnerWidth} / 2);
+						background: linear-gradient(-90deg, var(--MI_THEME-buttonGradateB), color(from var(--MI_THEME-buttonGradateA) srgb r g b / 0));
+					}
+				}
+
+				> .highlight.left {
+					> .shine.left {
+						left: calc(#{$thumbInnerWidth} / 2);
+						background: linear-gradient(90deg, var(--MI_THEME-buttonGradateB), color(from var(--MI_THEME-buttonGradateA) srgb r g b / 0));
+					}
 				}
 			}
 
@@ -290,11 +322,25 @@ function onMousedown(ev: MouseEvent | TouchEvent) {
 				width: $thumbWidth;
 				height: $thumbHeight;
 				cursor: grab;
-				background: var(--MI_THEME-accent);
-				border-radius: 999px;
 
 				&:hover {
-					background: hsl(from var(--MI_THEME-accent) h s calc(l + 10));
+					> .thumbInner {
+						background: hsl(from var(--MI_THEME-accent) h s calc(l + 10));
+					}
+				}
+
+				> .thumbInner {
+					position: absolute;
+					top: 0;
+					left: 0;
+					right: 0;
+					bottom: 0;
+					margin: auto;
+					width: $thumbInnerWidth;
+					height: $thumbInnerHeight;
+					background: var(--MI_THEME-accent);
+					border-radius: 999px;
+					pointer-events: none;
 				}
 			}
 		}
diff --git a/packages/frontend/src/components/MkUploaderDialog.vue b/packages/frontend/src/components/MkUploaderDialog.vue
index a0d25d08d3..b2e4896ed3 100644
--- a/packages/frontend/src/components/MkUploaderDialog.vue
+++ b/packages/frontend/src/components/MkUploaderDialog.vue
@@ -28,7 +28,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					v-for="ctx in items"
 					:key="ctx.id"
 					v-panel
-					:class="[$style.item, ctx.waiting ? $style.itemWaiting : null, ctx.uploaded ? $style.itemCompleted : null, ctx.uploadFailed ? $style.itemFailed : null]"
+					:class="[$style.item, ctx.preprocessing ? $style.itemWaiting : null, ctx.uploaded ? $style.itemCompleted : null, ctx.uploadFailed ? $style.itemFailed : null]"
 					:style="{ '--p': ctx.progress != null ? `${ctx.progress.value / ctx.progress.max * 100}%` : '0%' }"
 				>
 					<div :class="$style.itemInner">
@@ -40,8 +40,8 @@ SPDX-License-Identifier: AGPL-3.0-only
 							<div><MkCondensedLine :minScale="2 / 3">{{ ctx.name }}</MkCondensedLine></div>
 							<div :class="$style.itemInfo">
 								<span>{{ ctx.file.type }}</span>
-								<span>{{ bytes(ctx.file.size) }}</span>
 								<span v-if="ctx.compressedSize">({{ i18n.tsx._uploader.compressedToX({ x: bytes(ctx.compressedSize) }) }} = {{ i18n.tsx._uploader.savedXPercent({ x: Math.round((1 - ctx.compressedSize / ctx.file.size) * 100) }) }})</span>
+								<span v-else>{{ bytes(ctx.file.size) }}</span>
 							</div>
 							<div>
 							</div>
@@ -59,19 +59,6 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<MkButton style="margin: auto;" :iconOnly="true" rounded @click="chooseFile($event)"><i class="ti ti-plus"></i></MkButton>
 			</div>
 
-			<MkSelect
-				v-if="items.length > 0"
-				v-model="compressionLevel"
-				:items="[
-					{ value: 0, label: i18n.ts.none },
-					{ value: 1, label: i18n.ts.low },
-					{ value: 2, label: i18n.ts.middle },
-					{ value: 3, label: i18n.ts.high },
-				]"
-			>
-				<template #label>{{ i18n.ts.compress }}</template>
-			</MkSelect>
-
 			<div>{{ i18n.tsx._uploader.maxFileSizeIsX({ x: $i.policies.maxFileSizeMb + 'MB' }) }}</div>
 
 			<!-- クライアントで検出するMIME typeとサーバーで検出するMIME typeが異なる場合があり、混乱の元になるのでとりあえず隠しとく -->
@@ -93,7 +80,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 </template>
 
 <script lang="ts" setup>
-import { computed, markRaw, onMounted, ref, useTemplateRef, watch } from 'vue';
+import { computed, defineAsyncComponent, markRaw, onMounted, onUnmounted, ref, triggerRef, useTemplateRef, watch } from 'vue';
 import * as Misskey from 'misskey-js';
 import { genId } from '@/utility/id.js';
 import { readAndCompressImage } from '@misskey-dev/browser-image-resizer';
@@ -109,6 +96,7 @@ import { isWebpSupported } from '@/utility/isWebpSupported.js';
 import { uploadFile, UploadAbortedError } from '@/utility/drive.js';
 import * as os from '@/os.js';
 import { ensureSignin } from '@/i.js';
+import { WatermarkRenderer } from '@/utility/watermark.js';
 
 const $i = ensureSignin();
 
@@ -125,6 +113,14 @@ const CROPPING_SUPPORTED_TYPES = [
 	'image/webp',
 ];
 
+const IMAGE_EDITING_SUPPORTED_TYPES = [
+	'image/jpeg',
+	'image/png',
+	'image/webp',
+];
+
+const WATERMARK_SUPPORTED_TYPES = IMAGE_EDITING_SUPPORTED_TYPES;
+
 const mimeTypeMap = {
 	'image/webp': 'webp',
 	'image/jpeg': 'jpg',
@@ -148,16 +144,19 @@ const emit = defineEmits<{
 const items = ref<{
 	id: string;
 	name: string;
+	uploadName?: string;
 	progress: { max: number; value: number } | null;
 	thumbnail: string;
-	waiting: boolean;
+	preprocessing: boolean;
 	uploading: boolean;
 	uploaded: Misskey.entities.DriveFile | null;
 	uploadFailed: boolean;
 	aborted: boolean;
+	compressionLevel: number;
 	compressedSize?: number | null;
-	compressedImage?: Blob | null;
+	preprocessedFile?: Blob | null;
 	file: File;
+	watermarkPresetId: string | null;
 	abort?: (() => void) | null;
 }[]>([]);
 
@@ -165,7 +164,7 @@ const dialog = useTemplateRef('dialog');
 
 const firstUploadAttempted = ref(false);
 const isUploading = computed(() => items.value.some(item => item.uploading));
-const canRetry = computed(() => firstUploadAttempted.value && !items.value.some(item => item.uploading || item.waiting) && items.value.some(item => item.uploaded == null));
+const canRetry = computed(() => firstUploadAttempted.value && !items.value.some(item => item.uploading || item.preprocessing) && items.value.some(item => item.uploaded == null));
 const canDone = computed(() => items.value.some(item => item.uploaded != null));
 const overallProgress = computed(() => {
 	const max = items.value.length;
@@ -178,19 +177,18 @@ const overallProgress = computed(() => {
 	return Math.round((v / max) * 100);
 });
 
-const compressionLevel = ref<0 | 1 | 2 | 3>(2);
-const compressionSettings = computed(() => {
-	if (compressionLevel.value === 1) {
+function getCompressionSettings(level: 0 | 1 | 2 | 3) {
+	if (level === 1) {
 		return {
 			maxWidth: 2000,
 			maxHeight: 2000,
 		};
-	} else if (compressionLevel.value === 2) {
+	} else if (level === 2) {
 		return {
 			maxWidth: 2000 * 0.75, // =1500
 			maxHeight: 2000 * 0.75, // =1500
 		};
-	} else if (compressionLevel.value === 3) {
+	} else if (level === 3) {
 		return {
 			maxWidth: 2000 * 0.75 * 0.75, // =1125
 			maxHeight: 2000 * 0.75 * 0.75, // =1125
@@ -198,7 +196,7 @@ const compressionSettings = computed(() => {
 	} else {
 		return null;
 	}
-});
+}
 
 watch(items, () => {
 	if (items.value.length === 0) {
@@ -274,31 +272,151 @@ function showMenu(ev: MouseEvent, item: typeof items.value[0]) {
 		},
 	});
 
-	if (CROPPING_SUPPORTED_TYPES.includes(item.file.type) && !item.waiting && !item.uploading && !item.uploaded) {
+	if (CROPPING_SUPPORTED_TYPES.includes(item.file.type) && !item.preprocessing && !item.uploading && !item.uploaded) {
 		menu.push({
 			icon: 'ti ti-crop',
 			text: i18n.ts.cropImage,
 			action: async () => {
 				const cropped = await os.cropImageFile(item.file, { aspectRatio: null });
-				items.value.splice(items.value.indexOf(item), 1, {
+				URL.revokeObjectURL(item.thumbnail);
+				const newItem = {
 					...item,
 					file: markRaw(cropped),
 					thumbnail: window.URL.createObjectURL(cropped),
+				};
+				items.value.splice(items.value.indexOf(item), 1, newItem);
+				preprocess(newItem).then(() => {
+					triggerRef(items);
+				});
+			},
+		});
+	}
+
+	if (IMAGE_EDITING_SUPPORTED_TYPES.includes(item.file.type) && !item.preprocessing && !item.uploading && !item.uploaded) {
+		menu.push({
+			icon: 'ti ti-sparkles',
+			text: i18n.ts._imageEffector.title + ' (BETA)',
+			action: async () => {
+				const { dispose } = await os.popupAsyncWithDialog(import('@/components/MkImageEffectorDialog.vue').then(x => x.default), {
+					image: item.file,
+				}, {
+					ok: (file) => {
+						URL.revokeObjectURL(item.thumbnail);
+						const newItem = {
+							...item,
+							file: markRaw(file),
+							thumbnail: window.URL.createObjectURL(file),
+						};
+						items.value.splice(items.value.indexOf(item), 1, newItem);
+						preprocess(newItem).then(() => {
+							triggerRef(items);
+						});
+					},
+					closed: () => dispose(),
 				});
 			},
 		});
 	}
 
-	if (!item.waiting && !item.uploading && !item.uploaded) {
+	if (WATERMARK_SUPPORTED_TYPES.includes(item.file.type) && !item.preprocessing && !item.uploading && !item.uploaded) {
+		function changeWatermarkPreset(presetId: string | null) {
+			item.watermarkPresetId = presetId;
+			preprocess(item).then(() => {
+				triggerRef(items);
+			});
+		}
+
+		menu.push({
+			icon: 'ti ti-copyright',
+			text: i18n.ts.watermark,
+			type: 'parent',
+			children: [{
+				type: 'radioOption',
+				text: i18n.ts.none,
+				active: computed(() => item.watermarkPresetId == null),
+				action: () => changeWatermarkPreset(null),
+			}, {
+				type: 'divider',
+			}, ...prefer.s.watermarkPresets.map(preset => ({
+				type: 'radioOption',
+				text: preset.name,
+				active: computed(() => item.watermarkPresetId === preset.id),
+				action: () => changeWatermarkPreset(preset.id),
+			})), {
+				type: 'divider',
+			}, {
+				type: 'button',
+				icon: 'ti ti-plus',
+				text: i18n.ts.add,
+				action: async () => {
+					const { dispose } = await os.popupAsyncWithDialog(import('@/components/MkWatermarkEditorDialog.vue').then(x => x.default), {
+						image: item.file,
+					}, {
+						ok: (preset) => {
+							prefer.commit('watermarkPresets', [...prefer.s.watermarkPresets, preset]);
+							changeWatermarkPreset(preset.id);
+						},
+						closed: () => dispose(),
+					});
+				},
+			}],
+		});
+	}
+
+	if (COMPRESSION_SUPPORTED_TYPES.includes(item.file.type) && !item.preprocessing && !item.uploading && !item.uploaded) {
+		function changeCompressionLevel(level: 0 | 1 | 2 | 3) {
+			item.compressionLevel = level;
+			preprocess(item).then(() => {
+				triggerRef(items);
+			});
+		}
+
+		menu.push({
+			icon: 'ti ti-leaf',
+			text: i18n.ts.compress,
+			type: 'parent',
+			children: [{
+				type: 'radioOption',
+				text: i18n.ts.none,
+				active: computed(() => item.compressionLevel === 0 || item.compressionLevel == null),
+				action: () => changeCompressionLevel(0),
+			}, {
+				type: 'divider',
+			}, {
+				type: 'radioOption',
+				text: i18n.ts.low,
+				active: computed(() => item.compressionLevel === 1),
+				action: () => changeCompressionLevel(1),
+			}, {
+				type: 'radioOption',
+				text: i18n.ts.medium,
+				active: computed(() => item.compressionLevel === 2),
+				action: () => changeCompressionLevel(2),
+			}, {
+				type: 'radioOption',
+				text: i18n.ts.high,
+				active: computed(() => item.compressionLevel === 3),
+				action: () => changeCompressionLevel(3),
+			},
+			],
+		});
+	}
+
+	if (!item.preprocessing && !item.uploading && !item.uploaded) {
 		menu.push({
+			type: 'divider',
+		}, {
 			icon: 'ti ti-x',
 			text: i18n.ts.remove,
 			action: () => {
+				URL.revokeObjectURL(item.thumbnail);
 				items.value.splice(items.value.indexOf(item), 1);
 			},
 		});
 	} else if (item.uploading) {
 		menu.push({
+			type: 'divider',
+		}, {
 			icon: 'ti ti-cloud-pause',
 			text: i18n.ts.abort,
 			danger: true,
@@ -320,7 +438,6 @@ async function upload() { // エラーハンドリングなどを考慮してシ
 		...item,
 		aborted: false,
 		uploadFailed: false,
-		waiting: false,
 		uploading: false,
 	}));
 
@@ -330,40 +447,13 @@ async function upload() { // エラーハンドリングなどを考慮してシ
 			continue;
 		}
 
-		item.waiting = true;
 		item.uploadFailed = false;
-
-		const shouldCompress = item.compressedImage == null && compressionLevel.value !== 0 && compressionSettings.value && COMPRESSION_SUPPORTED_TYPES.includes(item.file.type) && !(await isAnimated(item.file));
-
-		if (shouldCompress) {
-			const config = {
-				mimeType: isWebpSupported() ? 'image/webp' : 'image/jpeg',
-				maxWidth: compressionSettings.value.maxWidth,
-				maxHeight: compressionSettings.value.maxHeight,
-				quality: isWebpSupported() ? 0.85 : 0.8,
-			};
-
-			try {
-				const result = await readAndCompressImage(item.file, config);
-				if (result.size < item.file.size || item.file.type === 'image/webp') {
-					// The compression may not always reduce the file size
-					// (and WebP is not browser safe yet)
-					item.compressedImage = markRaw(result);
-					item.compressedSize = result.size;
-					item.name = item.file.type !== config.mimeType ? `${item.name}.${mimeTypeMap[config.mimeType]}` : item.name;
-				}
-			} catch (err) {
-				console.error('Failed to resize image', err);
-			}
-		}
-
 		item.uploading = true;
 
-		const { filePromise, abort } = uploadFile(item.compressedImage ?? item.file, {
-			name: item.name,
+		const { filePromise, abort } = uploadFile(item.preprocessedFile ?? item.file, {
+			name: item.uploadName ?? item.name,
 			folderId: props.folderId,
 			onProgress: (progress) => {
-				item.waiting = false;
 				if (item.progress == null) {
 					item.progress = { max: progress.total, value: progress.loaded };
 				} else {
@@ -377,7 +467,6 @@ async function upload() { // エラーハンドリングなどを考慮してシ
 			item.abort = null;
 			abort();
 			item.uploading = false;
-			item.waiting = false;
 			item.uploadFailed = true;
 		};
 
@@ -392,7 +481,6 @@ async function upload() { // エラーハンドリングなどを考慮してシ
 			}
 		}).finally(() => {
 			item.uploading = false;
-			item.waiting = false;
 		});
 	}
 }
@@ -419,21 +507,95 @@ async function chooseFile(ev: MouseEvent) {
 	}
 }
 
+async function preprocess(item: (typeof items)['value'][number]): Promise<void> {
+	item.preprocessing = true;
+
+	let file: Blob | File = item.file;
+	const imageBitmap = await window.createImageBitmap(file);
+
+	const needsWatermark = item.watermarkPresetId != null && WATERMARK_SUPPORTED_TYPES.includes(file.type);
+	const preset = prefer.s.watermarkPresets.find(p => p.id === item.watermarkPresetId);
+	if (needsWatermark && preset != null) {
+		const canvas = window.document.createElement('canvas');
+		const renderer = new WatermarkRenderer({
+			canvas: canvas,
+			renderWidth: imageBitmap.width,
+			renderHeight: imageBitmap.height,
+			image: imageBitmap,
+		});
+
+		await renderer.setLayers(preset.layers);
+
+		renderer.render();
+
+		file = await new Promise<Blob>((resolve) => {
+			canvas.toBlob((blob) => {
+				if (blob == null) {
+					throw new Error('Failed to convert canvas to blob');
+				}
+				resolve(blob);
+				renderer.destroy();
+			}, 'image/png');
+		});
+	}
+
+	const compressionSettings = getCompressionSettings(item.compressionLevel);
+	const needsCompress = item.compressionLevel !== 0 && compressionSettings && COMPRESSION_SUPPORTED_TYPES.includes(file.type) && !(await isAnimated(file));
+
+	if (needsCompress) {
+		const config = {
+			mimeType: isWebpSupported() ? 'image/webp' : 'image/jpeg',
+			maxWidth: compressionSettings.maxWidth,
+			maxHeight: compressionSettings.maxHeight,
+			quality: isWebpSupported() ? 0.85 : 0.8,
+		};
+
+		try {
+			const result = await readAndCompressImage(file, config);
+			if (result.size < file.size || file.type === 'image/webp') {
+				// The compression may not always reduce the file size
+				// (and WebP is not browser safe yet)
+				file = result;
+				item.compressedSize = result.size;
+				item.uploadName = file.type !== config.mimeType ? `${item.name}.${mimeTypeMap[config.mimeType]}` : item.name;
+			}
+		} catch (err) {
+			console.error('Failed to resize image', err);
+		}
+	} else {
+		item.compressedSize = null;
+		item.uploadName = item.name;
+	}
+
+	URL.revokeObjectURL(item.thumbnail);
+	item.thumbnail = window.URL.createObjectURL(file);
+	item.preprocessedFile = markRaw(file);
+	item.preprocessing = false;
+
+	imageBitmap.close();
+}
+
 function initializeFile(file: File) {
 	const id = genId();
 	const filename = file.name ?? 'untitled';
 	const extension = filename.split('.').length > 1 ? '.' + filename.split('.').pop() : '';
-	items.value.push({
+	const item = {
 		id,
 		name: prefer.s.keepOriginalFilename ? filename : id + extension,
 		progress: null,
 		thumbnail: window.URL.createObjectURL(file),
-		waiting: false,
+		preprocessing: false,
 		uploading: false,
 		aborted: false,
 		uploaded: null,
 		uploadFailed: false,
+		compressionLevel: prefer.s.defaultImageCompressionLevel,
+		watermarkPresetId: prefer.s.defaultWatermarkPresetId,
 		file: markRaw(file),
+	};
+	items.value.push(item);
+	preprocess(item).then(() => {
+		triggerRef(items);
 	});
 }
 
@@ -442,6 +604,12 @@ onMounted(() => {
 		initializeFile(file);
 	}
 });
+
+onUnmounted(() => {
+	for (const item of items.value) {
+		URL.revokeObjectURL(item.thumbnail);
+	}
+});
 </script>
 
 <style lang="scss" module>
diff --git a/packages/frontend/src/components/MkWatermarkEditorDialog.Layer.vue b/packages/frontend/src/components/MkWatermarkEditorDialog.Layer.vue
new file mode 100644
index 0000000000..10de04c16a
--- /dev/null
+++ b/packages/frontend/src/components/MkWatermarkEditorDialog.Layer.vue
@@ -0,0 +1,318 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<div :class="$style.root" class="_gaps">
+	<template v-if="layer.type === 'text'">
+		<MkInput v-model="layer.text">
+			<template #label>{{ i18n.ts._watermarkEditor.text }}</template>
+		</MkInput>
+
+		<FormSlot>
+			<template #label>{{ i18n.ts._watermarkEditor.position }}</template>
+			<MkPositionSelector
+				v-model:x="layer.align.x"
+				v-model:y="layer.align.y"
+			></MkPositionSelector>
+		</FormSlot>
+
+		<MkRange
+			v-model="layer.scale"
+			:min="0"
+			:max="1"
+			:step="0.01"
+			:textConverter="(v) => (v * 100).toFixed(1) + '%'"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.scale }}</template>
+		</MkRange>
+
+		<MkRange
+			v-model="layer.angle"
+			:min="-1"
+			:max="1"
+			:step="0.01"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.angle }}</template>
+		</MkRange>
+
+		<MkRange
+			v-model="layer.opacity"
+			:min="0"
+			:max="1"
+			:step="0.01"
+			:textConverter="(v) => (v * 100).toFixed(1) + '%'"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.opacity }}</template>
+		</MkRange>
+
+		<MkSwitch v-model="layer.repeat">
+			<template #label>{{ i18n.ts._watermarkEditor.repeat }}</template>
+		</MkSwitch>
+	</template>
+
+	<template v-else-if="layer.type === 'image'">
+		<MkButton inline rounded primary @click="chooseFile">{{ i18n.ts.selectFile }}</MkButton>
+
+		<FormSlot>
+			<template #label>{{ i18n.ts._watermarkEditor.position }}</template>
+			<MkPositionSelector
+				v-model:x="layer.align.x"
+				v-model:y="layer.align.y"
+			></MkPositionSelector>
+		</FormSlot>
+
+		<MkRange
+			v-model="layer.scale"
+			:min="0"
+			:max="1"
+			:step="0.01"
+			:textConverter="(v) => (v * 100).toFixed(1) + '%'"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.scale }}</template>
+		</MkRange>
+
+		<MkRange
+			v-model="layer.angle"
+			:min="-1"
+			:max="1"
+			:step="0.01"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.angle }}</template>
+		</MkRange>
+
+		<MkRange
+			v-model="layer.opacity"
+			:min="0"
+			:max="1"
+			:step="0.01"
+			:textConverter="(v) => (v * 100).toFixed(1) + '%'"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.opacity }}</template>
+		</MkRange>
+
+		<MkSwitch v-model="layer.repeat">
+			<template #label>{{ i18n.ts._watermarkEditor.repeat }}</template>
+		</MkSwitch>
+
+		<MkSwitch v-model="layer.cover">
+			<template #label>{{ i18n.ts._watermarkEditor.cover }}</template>
+		</MkSwitch>
+	</template>
+
+	<template v-else-if="layer.type === 'stripe'">
+		<MkRange
+			v-model="layer.frequency"
+			:min="1"
+			:max="30"
+			:step="0.01"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.stripeFrequency }}</template>
+		</MkRange>
+
+		<MkRange
+			v-model="layer.threshold"
+			:min="0"
+			:max="1"
+			:step="0.01"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.stripeWidth }}</template>
+		</MkRange>
+
+		<MkRange
+			v-model="layer.angle"
+			:min="-1"
+			:max="1"
+			:step="0.01"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.angle }}</template>
+		</MkRange>
+
+		<MkRange
+			v-model="layer.opacity"
+			:min="0"
+			:max="1"
+			:step="0.01"
+			:textConverter="(v) => (v * 100).toFixed(1) + '%'"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.opacity }}</template>
+		</MkRange>
+	</template>
+
+	<template v-else-if="layer.type === 'polkadot'">
+		<MkRange
+			v-model="layer.angle"
+			:min="-1"
+			:max="1"
+			:step="0.01"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.angle }}</template>
+		</MkRange>
+
+		<MkRange
+			v-model="layer.scale"
+			:min="0"
+			:max="10"
+			:step="0.01"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.scale }}</template>
+		</MkRange>
+
+		<MkRange
+			v-model="layer.majorRadius"
+			:min="0"
+			:max="1"
+			:step="0.01"
+			:textConverter="(v) => (v * 100).toFixed(1) + '%'"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.polkadotMainDotRadius }}</template>
+		</MkRange>
+
+		<MkRange
+			v-model="layer.majorOpacity"
+			:min="0"
+			:max="1"
+			:step="0.01"
+			:textConverter="(v) => (v * 100).toFixed(1) + '%'"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.polkadotMainDotOpacity }}</template>
+		</MkRange>
+
+		<MkRange
+			v-model="layer.minorDivisions"
+			:min="0"
+			:max="16"
+			:step="1"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.polkadotSubDotDivisions }}</template>
+		</MkRange>
+
+		<MkRange
+			v-model="layer.minorRadius"
+			:min="0"
+			:max="1"
+			:step="0.01"
+			:textConverter="(v) => (v * 100).toFixed(1) + '%'"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.polkadotSubDotRadius }}</template>
+		</MkRange>
+
+		<MkRange
+			v-model="layer.minorOpacity"
+			:min="0"
+			:max="1"
+			:step="0.01"
+			:textConverter="(v) => (v * 100).toFixed(1) + '%'"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.polkadotSubDotOpacity }}</template>
+		</MkRange>
+	</template>
+
+	<template v-else-if="layer.type === 'checker'">
+		<MkRange
+			v-model="layer.angle"
+			:min="-1"
+			:max="1"
+			:step="0.01"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.angle }}</template>
+		</MkRange>
+
+		<MkRange
+			v-model="layer.scale"
+			:min="0"
+			:max="10"
+			:step="0.01"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.scale }}</template>
+		</MkRange>
+
+		<MkRange
+			v-model="layer.opacity"
+			:min="0"
+			:max="1"
+			:step="0.01"
+			:textConverter="(v) => (v * 100).toFixed(1) + '%'"
+			continuousUpdate
+		>
+			<template #label>{{ i18n.ts._watermarkEditor.opacity }}</template>
+		</MkRange>
+	</template>
+</div>
+</template>
+
+<script setup lang="ts">
+import { ref, useTemplateRef, watch, onMounted, onUnmounted } from 'vue';
+import type { WatermarkPreset } from '@/utility/watermark.js';
+import { i18n } from '@/i18n.js';
+import MkSelect from '@/components/MkSelect.vue';
+import MkButton from '@/components/MkButton.vue';
+import MkInput from '@/components/MkInput.vue';
+import MkSwitch from '@/components/MkSwitch.vue';
+import MkRange from '@/components/MkRange.vue';
+import FormSlot from '@/components/form/slot.vue';
+import MkPositionSelector from '@/components/MkPositionSelector.vue';
+import * as os from '@/os.js';
+import { selectFile } from '@/utility/drive.js';
+import { misskeyApi } from '@/utility/misskey-api.js';
+import { prefer } from '@/preferences.js';
+
+const layer = defineModel<WatermarkPreset['layers'][number]>('layer', { required: true });
+
+const driveFile = ref();
+const driveFileError = ref(false);
+onMounted(async () => {
+	if (layer.value.type === 'image' && layer.value.imageId != null) {
+		await misskeyApi('drive/files/show', {
+			fileId: layer.value.imageId,
+		}).then((res) => {
+			driveFile.value = res;
+		}).catch((err) => {
+			driveFileError.value = true;
+		});
+	}
+});
+
+function chooseFile(ev: MouseEvent) {
+	selectFile(ev.currentTarget ?? ev.target, i18n.ts.selectFile).then((file) => {
+		if (!file.type.startsWith('image')) {
+			os.alert({
+				type: 'warning',
+				title: i18n.ts._watermarkEditor.driveFileTypeWarn,
+				text: i18n.ts._watermarkEditor.driveFileTypeWarnDescription,
+			});
+			return;
+		}
+
+		layer.value.imageId = file.id;
+		layer.value.imageUrl = file.url;
+		driveFileError.value = false;
+	});
+}
+</script>
+
+<style module>
+.root {
+
+}
+</style>
diff --git a/packages/frontend/src/components/MkWatermarkEditorDialog.vue b/packages/frontend/src/components/MkWatermarkEditorDialog.vue
new file mode 100644
index 0000000000..4cfb4a72bc
--- /dev/null
+++ b/packages/frontend/src/components/MkWatermarkEditorDialog.vue
@@ -0,0 +1,455 @@
+<!--
+SPDX-FileCopyrightText: syuilo and misskey-project
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
+<template>
+<MkModalWindow
+	ref="dialog"
+	:width="1000"
+	:height="600"
+	:scroll="false"
+	:withOkButton="true"
+	@close="cancel()"
+	@ok="save()"
+	@closed="emit('closed')"
+>
+	<template #header><i class="ti ti-copyright"></i> {{ i18n.ts._watermarkEditor.title }}</template>
+
+	<div :class="$style.root">
+		<div :class="$style.container">
+			<div :class="$style.preview">
+				<canvas ref="canvasEl" :class="$style.previewCanvas"></canvas>
+				<div :class="$style.previewContainer">
+					<div class="_acrylic" :class="$style.previewTitle">{{ i18n.ts.preview }}</div>
+					<div v-if="props.image == null" class="_acrylic" :class="$style.previewControls">
+						<button class="_button" :class="[$style.previewControlsButton, sampleImageType === '3_2' ? $style.active : null]" @click="sampleImageType = '3_2'"><i class="ti ti-crop-landscape"></i></button>
+						<button class="_button" :class="[$style.previewControlsButton, sampleImageType === '2_3' ? $style.active : null]" @click="sampleImageType = '2_3'"><i class="ti ti-crop-portrait"></i></button>
+					</div>
+				</div>
+			</div>
+			<div :class="$style.controls">
+				<div class="_spacer _gaps">
+					<MkSelect v-model="type" :items="[{ label: i18n.ts._watermarkEditor.text, value: 'text' }, { label: i18n.ts._watermarkEditor.image, value: 'image' }, { label: i18n.ts._watermarkEditor.advanced, value: 'advanced' }]">
+						<template #label>{{ i18n.ts._watermarkEditor.type }}</template>
+					</MkSelect>
+
+					<div v-if="type === 'text' || type === 'image'">
+						<XLayer
+							v-for="(layer, i) in preset.layers"
+							:key="layer.id"
+							v-model:layer="preset.layers[i]"
+						></XLayer>
+					</div>
+					<div v-else-if="type === 'advanced'" class="_gaps_s">
+						<MkFolder v-for="(layer, i) in preset.layers" :key="layer.id" :defaultOpen="false" :canPage="false">
+							<template #label>
+								<div v-if="layer.type === 'text'">{{ i18n.ts._watermarkEditor.text }}</div>
+								<div v-if="layer.type === 'image'">{{ i18n.ts._watermarkEditor.image }}</div>
+								<div v-if="layer.type === 'stripe'">{{ i18n.ts._watermarkEditor.stripe }}</div>
+								<div v-if="layer.type === 'polkadot'">{{ i18n.ts._watermarkEditor.polkadot }}</div>
+								<div v-if="layer.type === 'checker'">{{ i18n.ts._watermarkEditor.checker }}</div>
+							</template>
+							<template #footer>
+								<div class="_buttons">
+									<MkButton iconOnly @click="removeLayer(layer)"><i class="ti ti-trash"></i></MkButton>
+									<MkButton iconOnly @click="swapUpLayer(layer)"><i class="ti ti-arrow-up"></i></MkButton>
+									<MkButton iconOnly @click="swapDownLayer(layer)"><i class="ti ti-arrow-down"></i></MkButton>
+								</div>
+							</template>
+
+							<XLayer
+								v-model:layer="preset.layers[i]"
+							></XLayer>
+						</MkFolder>
+
+						<MkButton rounded primary style="margin: 0 auto;" @click="addLayer"><i class="ti ti-plus"></i></MkButton>
+					</div>
+				</div>
+			</div>
+		</div>
+	</div>
+</MkModalWindow>
+</template>
+
+<script setup lang="ts">
+import { ref, useTemplateRef, watch, onMounted, onUnmounted, reactive, nextTick } from 'vue';
+import type { WatermarkPreset } from '@/utility/watermark.js';
+import { WatermarkRenderer } from '@/utility/watermark.js';
+import { i18n } from '@/i18n.js';
+import MkModalWindow from '@/components/MkModalWindow.vue';
+import MkSelect from '@/components/MkSelect.vue';
+import MkButton from '@/components/MkButton.vue';
+import MkFolder from '@/components/MkFolder.vue';
+import XLayer from '@/components/MkWatermarkEditorDialog.Layer.vue';
+import * as os from '@/os.js';
+import { deepClone } from '@/utility/clone.js';
+import { ensureSignin } from '@/i.js';
+import { genId } from '@/utility/id.js';
+
+const $i = ensureSignin();
+
+function createTextLayer(): WatermarkPreset['layers'][number] {
+	return {
+		id: genId(),
+		type: 'text',
+		text: `(c) @${$i.username}`,
+		align: { x: 'right', y: 'bottom' },
+		scale: 0.3,
+		angle: 0,
+		opacity: 0.75,
+		repeat: false,
+	};
+}
+
+function createImageLayer(): WatermarkPreset['layers'][number] {
+	return {
+		id: genId(),
+		type: 'image',
+		imageId: null,
+		imageUrl: null,
+		align: { x: 'right', y: 'bottom' },
+		scale: 0.3,
+		angle: 0,
+		opacity: 0.75,
+		repeat: false,
+		cover: false,
+	};
+}
+
+function createStripeLayer(): WatermarkPreset['layers'][number] {
+	return {
+		id: genId(),
+		type: 'stripe',
+		angle: 0.5,
+		frequency: 10,
+		threshold: 0.1,
+		black: false,
+		opacity: 0.75,
+	};
+}
+
+function createPolkadotLayer(): WatermarkPreset['layers'][number] {
+	return {
+		id: genId(),
+		type: 'polkadot',
+		angle: 0.5,
+		scale: 3,
+		majorRadius: 0.1,
+		minorRadius: 0.25,
+		majorOpacity: 0.75,
+		minorOpacity: 0.5,
+		minorDivisions: 4,
+		black: false,
+		opacity: 0.75,
+	};
+}
+
+function createCheckerLayer(): WatermarkPreset['layers'][number] {
+	return {
+		id: genId(),
+		type: 'checker',
+		angle: 0.5,
+		scale: 3,
+		black: false,
+		opacity: 0.75,
+	};
+}
+
+const props = defineProps<{
+	preset?: WatermarkPreset | null;
+	image?: File | null;
+}>();
+
+const preset = reactive<WatermarkPreset>(deepClone(props.preset) ?? {
+	id: genId(),
+	name: '',
+	layers: [createTextLayer()],
+});
+
+const emit = defineEmits<{
+	(ev: 'ok', preset: WatermarkPreset): void;
+	(ev: 'cancel'): void;
+	(ev: 'closed'): void;
+}>();
+
+const dialog = useTemplateRef('dialog');
+
+async function cancel() {
+	const { canceled } = await os.confirm({
+		text: i18n.ts._watermarkEditor.quitWithoutSaveConfirm,
+	});
+	if (canceled) return;
+
+	emit('cancel');
+	dialog.value?.close();
+}
+
+const type = ref(preset.layers.length > 1 ? 'advanced' : preset.layers[0].type);
+watch(type, () => {
+	if (type.value === 'text') {
+		preset.layers = [createTextLayer()];
+	} else if (type.value === 'image') {
+		preset.layers = [createImageLayer()];
+	} else if (type.value === 'advanced') {
+		// nop
+	}
+});
+
+watch(preset, async (newValue, oldValue) => {
+	if (renderer != null) {
+		renderer.setLayers(preset.layers);
+	}
+}, { deep: true });
+
+const canvasEl = useTemplateRef('canvasEl');
+
+const sampleImage_3_2 = new Image();
+sampleImage_3_2.src = '/client-assets/sample/3-2.jpg';
+const sampleImage_3_2_loading = new Promise<void>(resolve => {
+	sampleImage_3_2.onload = () => resolve();
+});
+
+const sampleImage_2_3 = new Image();
+sampleImage_2_3.src = '/client-assets/sample/2-3.jpg';
+const sampleImage_2_3_loading = new Promise<void>(resolve => {
+	sampleImage_2_3.onload = () => resolve();
+});
+
+const sampleImageType = ref(props.image != null ? 'provided' : '3_2');
+watch(sampleImageType, async () => {
+	if (renderer != null) {
+		renderer.destroy(false);
+		renderer = null;
+		initRenderer();
+	}
+});
+
+let renderer: WatermarkRenderer | null = null;
+let imageBitmap: ImageBitmap | null = null;
+
+async function initRenderer() {
+	if (canvasEl.value == null) return;
+
+	if (sampleImageType.value === '3_2') {
+		renderer = new WatermarkRenderer({
+			canvas: canvasEl.value,
+			renderWidth: 1500,
+			renderHeight: 1000,
+			image: sampleImage_3_2,
+		});
+	} else if (sampleImageType.value === '2_3') {
+		renderer = new WatermarkRenderer({
+			canvas: canvasEl.value,
+			renderWidth: 1000,
+			renderHeight: 1500,
+			image: sampleImage_2_3,
+		});
+	} else if (props.image != null) {
+		imageBitmap = await window.createImageBitmap(props.image);
+
+		const MAX_W = 1000;
+		const MAX_H = 1000;
+		let w = imageBitmap.width;
+		let h = imageBitmap.height;
+
+		if (w > MAX_W || h > MAX_H) {
+			const scale = Math.min(MAX_W / w, MAX_H / h);
+			w *= scale;
+			h *= scale;
+		}
+
+		renderer = new WatermarkRenderer({
+			canvas: canvasEl.value,
+			renderWidth: w,
+			renderHeight: h,
+			image: imageBitmap,
+		});
+	}
+
+	await renderer!.setLayers(preset.layers);
+
+	renderer!.render();
+}
+
+onMounted(async () => {
+	const closeWaiting = os.waiting();
+
+	await nextTick(); // waitingがレンダリングされるまで待つ
+
+	await sampleImage_3_2_loading;
+	await sampleImage_2_3_loading;
+
+	await initRenderer();
+
+	closeWaiting();
+});
+
+onUnmounted(() => {
+	if (renderer != null) {
+		renderer.destroy();
+		renderer = null;
+	}
+	if (imageBitmap != null) {
+		imageBitmap.close();
+		imageBitmap = null;
+	}
+});
+
+async function save() {
+	const { canceled, result: name } = await os.inputText({
+		title: i18n.ts.name,
+		default: preset.name,
+	});
+	if (canceled) return;
+
+	preset.name = name || '';
+
+	dialog.value?.close();
+	if (renderer != null) {
+		renderer.destroy();
+		renderer = null;
+	}
+
+	emit('ok', preset);
+}
+
+function addLayer(ev: MouseEvent) {
+	os.popupMenu([{
+		text: i18n.ts._watermarkEditor.text,
+		action: () => {
+			preset.layers.push(createTextLayer());
+		},
+	}, {
+		text: i18n.ts._watermarkEditor.image,
+		action: () => {
+			preset.layers.push(createImageLayer());
+		},
+	}, {
+		text: i18n.ts._watermarkEditor.stripe,
+		action: () => {
+			preset.layers.push(createStripeLayer());
+		},
+	}, {
+		text: i18n.ts._watermarkEditor.polkadot,
+		action: () => {
+			preset.layers.push(createPolkadotLayer());
+		},
+	}, {
+		text: i18n.ts._watermarkEditor.checker,
+		action: () => {
+			preset.layers.push(createCheckerLayer());
+		},
+	}], ev.currentTarget ?? ev.target);
+}
+
+function swapUpLayer(layer: WatermarkPreset['layers'][number]) {
+	const index = preset.layers.findIndex(l => l.id === layer.id);
+	if (index > 0) {
+		const tmp = preset.layers[index - 1];
+		preset.layers[index - 1] = preset.layers[index];
+		preset.layers[index] = tmp;
+	}
+}
+
+function swapDownLayer(layer: WatermarkPreset['layers'][number]) {
+	const index = preset.layers.findIndex(l => l.id === layer.id);
+	if (index < preset.layers.length - 1) {
+		const tmp = preset.layers[index + 1];
+		preset.layers[index + 1] = preset.layers[index];
+		preset.layers[index] = tmp;
+	}
+}
+
+function removeLayer(layer: WatermarkPreset['layers'][number]) {
+	preset.layers = preset.layers.filter(l => l.id !== layer.id);
+}
+</script>
+
+<style module>
+.root {
+	container-type: inline-size;
+	height: 100%;
+}
+
+.container {
+	height: 100%;
+	display: grid;
+	grid-template-columns: 1fr 400px;
+}
+
+.preview {
+	position: relative;
+	background-color: var(--MI_THEME-bg);
+	background-size: auto auto;
+	background-image: repeating-linear-gradient(135deg, transparent, transparent 6px, var(--MI_THEME-panel) 6px, var(--MI_THEME-panel) 12px);
+}
+
+.previewContainer {
+	display: flex;
+	flex-direction: column;
+	height: 100%;
+	user-select: none;
+	-webkit-user-drag: none;
+}
+
+.previewTitle {
+	position: absolute;
+	z-index: 100;
+	top: 8px;
+	left: 8px;
+	padding: 6px 10px;
+	border-radius: 6px;
+	font-size: 85%;
+}
+
+.previewControls {
+	position: absolute;
+	z-index: 100;
+	bottom: 8px;
+	right: 8px;
+	display: flex;
+	align-items: center;
+	gap: 8px;
+	padding: 6px 10px;
+	border-radius: 6px;
+}
+
+.previewControlsButton {
+	&.active {
+		color: var(--MI_THEME-accent);
+	}
+}
+
+.previewSpinner {
+	position: absolute;
+	top: 50%;
+	left: 50%;
+	transform: translate(-50%, -50%);
+	pointer-events: none;
+	user-select: none;
+	-webkit-user-drag: none;
+}
+
+.previewCanvas {
+	position: absolute;
+	top: 0;
+	left: 0;
+	width: 100%;
+	height: 100%;
+	padding: 20px;
+	box-sizing: border-box;
+	object-fit: contain;
+}
+
+.controls {
+	overflow-y: scroll;
+}
+
+@container (max-width: 800px) {
+	.container {
+		grid-template-columns: 1fr;
+		grid-template-rows: 1fr 1fr;
+	}
+}
+</style>