feat: add select format to download button

web/src/lib/components/schema/SchemaActions.svelte

@@ -1,31 +1,66 @@
 <script lang="ts">
 	import DownloadButton from "$lib/components/ui/DownloadButton.svelte";
 	import UploadButton from "$lib/components/ui/UploadButton.svelte";
+	import type { OutputMime } from "$lib/core/io";
+	import { outputFormatByMime } from "$lib/core/io";
 	import { t } from "$lib/i18n/t";
+	import type { ResultKind } from "$lib/registry";
+	import SchemaDownload from "./SchemaDownload.svelte";
 
 	interface Props {
 		inputMode: "image" | "text" | "none";
+		resultKind?: ResultKind;
 		canDownload: boolean;
 		running: boolean;
+		format?: OutputMime;
+		quality?: number;
+		alphaLoss?: boolean;
 		onupload: (file: File) => void;
 		ondownload: () => void;
+		onformat?: (mime: OutputMime) => void;
+		onquality?: (value: number) => void;
 	}
-	let { inputMode, canDownload, running, onupload, ondownload }: Props =
-		$props();
+	let {
+		inputMode,
+		resultKind = "image",
+		canDownload,
+		running,
+		format = "image/png",
+		quality = undefined,
+		alphaLoss = false,
+		onupload,
+		ondownload,
+		onformat,
+		onquality,
+	}: Props = $props();
 </script>
 
 <div class="actions">
 	{#if inputMode === "image"}
 		<UploadButton label={t("actions.openImage")} onfile={onupload} />
 	{/if}
-	{#if canDownload}
+	{#if canDownload && resultKind === "image"}
+		<SchemaDownload
+			{format}
+			{quality}
+			{running}
+			{ondownload}
+			onformat={(v) => onformat?.(v)}
+			onquality={(v) => onquality?.(v)}
+		/>
+	{:else if canDownload && resultKind === "files"}
 		<DownloadButton
-			label={t("actions.downloadResult")}
+			label={t("actions.downloadFormat", { format: "ZIP" })}
 			onclick={ondownload}
 			disabled={running}
 		/>
 	{/if}
 </div>
+{#if canDownload && alphaLoss}
+	<p class="alpha-warning" role="status">
+		{t("actions.alphaLoss", { format: outputFormatByMime(format).label })}
+	</p>
+{/if}
 
 <style>
 	.actions {
@@ -34,4 +69,9 @@
 		gap: var(--space-l);
 		flex-wrap: wrap;
 	}
+	.alpha-warning {
+		margin: var(--space-m) 0 0;
+		color: var(--color-warning);
+		font: var(--font-size-s) var(--font-mono);
+	}
 </style>

web/src/lib/components/schema/SchemaDownload.svelte

@@ -0,0 +1,186 @@
+<script lang="ts">
+	import RangeControl from "$lib/components/fields/schema/RangeControl.svelte";
+	import Icon from "$lib/components/ui/Icon.svelte";
+	import {
+		OUTPUT_FORMATS,
+		outputFormatByMime,
+		type OutputMime,
+	} from "$lib/core/io";
+	import type { SliderSpec } from "$lib/registry-schema";
+	import { t } from "$lib/i18n/t";
+	import { ChevronDown, Download } from "@lucide/svelte";
+
+	interface Props {
+		format: OutputMime;
+		quality?: number;
+		running: boolean;
+		ondownload: () => void;
+		onformat: (mime: OutputMime) => void;
+		onquality: (value: number) => void;
+	}
+	let { format, quality, running, ondownload, onformat, onquality }: Props =
+		$props();
+
+	const current = $derived(outputFormatByMime(format));
+	const qualitySetting = $derived(current.settings?.quality);
+	const qualitySpec = $derived(
+		qualitySetting
+			? ({
+					kind: "slider",
+					min: qualitySetting.min,
+					max: qualitySetting.max,
+					step: qualitySetting.step,
+					default: qualitySetting.default,
+				} satisfies SliderSpec)
+			: undefined,
+	);
+
+	let open = $state(false);
+	let root = $state<HTMLDivElement | null>(null);
+
+	function choose(mime: OutputMime) {
+		// Меню — ещё и панель настроек формата: не закрываем при выборе,
+		// чтобы можно было сразу настроить качество.
+		onformat(mime);
+	}
+
+	$effect(() => {
+		if (!open) return;
+		function onPointerDown(e: PointerEvent) {
+			if (!root?.contains(e.target as Node)) open = false;
+		}
+		function onKey(e: KeyboardEvent) {
+			if (e.key === "Escape") open = false;
+		}
+		window.addEventListener("pointerdown", onPointerDown);
+		window.addEventListener("keydown", onKey);
+		return () => {
+			window.removeEventListener("pointerdown", onPointerDown);
+			window.removeEventListener("keydown", onKey);
+		};
+	});
+</script>
+
+<div class="download-split" bind:this={root}>
+	<button
+		type="button"
+		class="main"
+		disabled={running}
+		onclick={() => {
+			open = false;
+			ondownload();
+		}}
+	>
+		<Icon icon={Download} size={14} />
+		<span>{t("actions.download")}</span>
+	</button>
+	<button
+		type="button"
+		class="toggle"
+		aria-haspopup="menu"
+		aria-expanded={open}
+		aria-label={t("actions.formatAria")}
+		disabled={running}
+		onclick={() => (open = !open)}
+	>
+		<span>{current.label}</span>
+		<Icon icon={ChevronDown} size={14} />
+	</button>
+	{#if open}
+		<div class="menu" role="menu">
+			{#each OUTPUT_FORMATS as f (f.mime)}
+				<button
+					type="button"
+					class="item"
+					class:selected={f.mime === format}
+					role="menuitemradio"
+					aria-checked={f.mime === format}
+					onclick={() => choose(f.mime)}
+				>
+					{f.label}
+				</button>
+			{/each}
+			{#if qualitySpec && quality !== undefined}
+				<div class="quality">
+					<RangeControl
+						label={t("fields.quality")}
+						value={quality}
+						spec={qualitySpec}
+						onchange={(q) => onquality(q)}
+					/>
+				</div>
+			{/if}
+		</div>
+	{/if}
+</div>
+
+<style>
+	.download-split {
+		position: relative;
+		display: inline-flex;
+	}
+	.main,
+	.toggle {
+		display: inline-flex;
+		align-items: center;
+		gap: var(--space-m);
+		padding: var(--space-m) var(--space-xl);
+		border: var(--size-border-thick) solid var(--color-main);
+		background: var(--color-main);
+		color: var(--color-background);
+		font-size: var(--font-size-l);
+		font-weight: bold;
+		cursor: pointer;
+	}
+	.main {
+		border-right: none;
+		border-radius: var(--radius-s) 0 0 var(--radius-s);
+	}
+	.toggle {
+		border-radius: 0 var(--radius-s) var(--radius-s) 0;
+		font-family: var(--font-mono);
+		font-size: var(--font-size-s);
+		font-weight: normal;
+	}
+	.main:disabled,
+	.toggle:disabled {
+		opacity: 0.5;
+		cursor: not-allowed;
+	}
+	.menu {
+		position: absolute;
+		top: calc(100% + var(--space-s));
+		right: 0;
+		z-index: var(--z-dropdown);
+		/* Ширина под строку качества: числовое поле + степперы + сброс. */
+		min-width: calc(var(--space-xxxl) * 9);
+		display: grid;
+		gap: var(--space-s);
+		padding: var(--space-m);
+		border: var(--size-border) solid var(--color-border);
+		border-radius: var(--radius-m);
+		background: var(--color-panel);
+	}
+	.item {
+		padding: var(--space-m) var(--space-l);
+		border: var(--size-border) solid transparent;
+		border-radius: var(--radius-s);
+		background: transparent;
+		color: var(--color-text-muted);
+		font: var(--font-size-s) var(--font-mono);
+		text-align: left;
+		cursor: pointer;
+	}
+	.item:hover {
+		color: var(--color-text);
+		border-color: var(--color-border);
+	}
+	.item.selected {
+		color: var(--color-main);
+		border-color: var(--color-main);
+	}
+	.quality {
+		padding-top: var(--space-m);
+		border-top: var(--size-border) solid var(--color-border);
+	}
+</style>

web/src/lib/components/schema/SchemaPreview.svelte

@@ -5,6 +5,7 @@
 	import SchemaResultTile from "./SchemaResultTile.svelte";
 	import SchemaSourceTile from "./SchemaSourceTile.svelte";
 	import type { PixelImage } from "$lib/core/types";
+	import type { OutputMime } from "$lib/core/io";
 	import { t } from "$lib/i18n/t";
 	import type { FileResult, InputMode, ResultKind } from "$lib/registry";
 
@@ -20,12 +21,17 @@
 		textVars?: Record<string, string | number>;
 		running?: boolean;
 		error?: string;
+		format?: OutputMime;
+		quality?: number;
+		alphaLoss?: boolean;
 		onupload: (file: File) => void;
 		ontextsource?: (text: string) => void;
 		onrendertext?: () => void;
 		oncopytext?: () => void;
 		ondownloadtxt?: () => void;
 		ondownload: () => void;
+		onformat?: (mime: OutputMime) => void;
+		onquality?: (value: number) => void;
 	}
 	let {
 		inputMode,
@@ -39,12 +45,17 @@
 		textVars = undefined,
 		running = false,
 		error = "",
+		format = "image/png",
+		quality = undefined,
+		alphaLoss = false,
 		onupload,
 		ontextsource,
 		onrendertext,
 		oncopytext,
 		ondownloadtxt,
 		ondownload,
+		onformat,
+		onquality,
 	}: Props = $props();
 
 	const model = $derived(
@@ -59,10 +70,16 @@
 	<span class="label">{t("resultCard.previewPanel")}</span>
 	<SchemaActions
 		{inputMode}
+		{resultKind}
 		canDownload={model.hasResult}
 		{running}
+		{format}
+		{quality}
+		{alphaLoss}
 		{onupload}
 		{ondownload}
+		{onformat}
+		{onquality}
 	/>
 </div>
 
@@ -98,7 +115,6 @@
 		items={[
 			{ caption: t("sourceCard.source"), value: model.sourceValue },
 			{ caption: t("resultCard.result"), value: model.resultValue },
-			{ caption: t("resultCard.format"), value: model.formatValue },
 		]}
 	/>
 </div>

web/src/lib/components/schema/SchemaToolView.svelte

@@ -2,8 +2,15 @@
 	import SchemaFields from "./SchemaFields.svelte";
 	import SchemaPreview from "./SchemaPreview.svelte";
 	import { debounce } from "$lib/core/debounce";
+	import { hasTransparency } from "$lib/core/analyze";
 	import { ToolError, type ErrorVars } from "$lib/core/errors";
-	import { decodeFile, downloadBlob, encode } from "$lib/core/io";
+	import {
+		decodeFile,
+		downloadBlob,
+		encode,
+		outputFormatByMime,
+		type OutputMime,
+	} from "$lib/core/io";
 	import type { PixelImage } from "$lib/core/types";
 	import { execute } from "$lib/executor";
 	import {
@@ -58,6 +65,33 @@
 	let running = $state(false);
 	let displayError = $state<DisplayError | null>(null);
 	let started = $state(false);
+	let format = $state<OutputMime>("image/png");
+	// Качество lossy-форматов для инструментов без quality-параметра в схеме.
+	let formatQuality = $state<Record<string, number>>({});
+
+	const alphaLoss = $derived(
+		resultKind === "image" &&
+			result !== null &&
+			!outputFormatByMime(format).supportsAlpha &&
+			hasTransparency(result),
+	);
+	// Если в схеме есть quality-параметр (convert-инструменты), он — единый
+	// источник качества; dropdown редактирует его же.
+	const qualityParamId = $derived(tool.output?.qualityParamId);
+	const currentQuality = $derived.by(() => {
+		const setting = outputFormatByMime(format).settings?.quality;
+		if (!setting) return undefined;
+		if (qualityParamId) return Number(values[qualityParamId]);
+		return formatQuality[format] ?? setting.default;
+	});
+
+	function setFormatQuality(q: number) {
+		if (qualityParamId) {
+			setValue(qualityParamId, q);
+		} else {
+			formatQuality = { ...formatQuality, [format]: q };
+		}
+	}
 
 	const errorText = $derived.by(() => {
 		const current = displayError;
@@ -73,6 +107,7 @@
 		if (!schema || started) return;
 		started = true;
 		values = defaultSchemaParams(schema);
+		format = tool.output?.mime ?? "image/png";
 	}
 
 	function setValue(
@@ -196,12 +231,11 @@
 				return;
 			}
 			if (!result) return;
-			const out = tool.output;
-			const quality = out?.qualityParamId
-				? Number(values[out.qualityParamId]) / 100
-				: undefined;
-			const blob = await encode(result, out?.mime ?? "image/png", quality);
-			downloadBlob(blob, `${page.slug}.${out?.ext ?? "png"}`);
+			const out = outputFormatByMime(format);
+			const quality =
+				currentQuality !== undefined ? currentQuality / 100 : undefined;
+			const blob = await encode(result, out.mime, quality);
+			downloadBlob(blob, `${page.slug}.${out.ext}`);
 		} catch (e) {
 			displayError = toDisplayError(e);
 		} finally {
@@ -311,6 +345,11 @@
 					{resultKind}
 					{running}
 					error={errorText}
+					{format}
+					quality={currentQuality}
+					{alphaLoss}
+					onformat={(v) => (format = v)}
+					onquality={setFormatQuality}
 					onupload={handleFile}
 					ontextsource={(textValue) => {
 						textSource = textValue;

web/src/lib/components/schema/schema-preview-model.test.ts

@@ -56,7 +56,6 @@ describe("buildSchemaPreviewModel", () => {
 		).toEqual({
 			sourceValue: "—",
 			resultValue: "2 × 3 px",
-			formatValue: "PNG",
 			hasResult: true,
 		});
 		expect(buildSchemaPreviewModel(input(), translate)).toMatchObject({
@@ -75,7 +74,6 @@ describe("buildSchemaPreviewModel", () => {
 		).toEqual({
 			sourceValue: "—",
 			resultValue: "1 parts",
-			formatValue: "ZIP (PNG)",
 			hasResult: true,
 		});
 		expect(
@@ -96,7 +94,6 @@ describe("buildSchemaPreviewModel", () => {
 				),
 			).toMatchObject({
 				resultValue: "Text",
-				formatValue: "PNG",
 				hasResult: true,
 			});
 			expect(

web/src/lib/components/schema/schema-preview-model.ts

@@ -15,7 +15,6 @@ export type SchemaPreviewModelInput = {
 export type SchemaPreviewModel = {
 	sourceValue: string;
 	resultValue: string;
-	formatValue: string;
 	hasResult: boolean;
 };
 
@@ -49,7 +48,6 @@ export function buildSchemaPreviewModel(
 	return {
 		sourceValue,
 		resultValue,
-		formatValue: resultKind === "files" ? "ZIP (PNG)" : "PNG",
 		hasResult:
 			resultKind === "image"
 				? Boolean(result)

web/src/lib/core/io.ts

@@ -5,6 +5,45 @@ import { type PixelImage } from "./types";
 export type OutputMime =
 	"image/png" | "image/jpeg" | "image/webp" | "image/bmp";
 
+export interface OutputFormatOption {
+	mime: OutputMime;
+	ext: string;
+	label: string;
+	supportsAlpha: boolean;
+	/** Точные настройки формата в dropdown кнопки Download (расширяемо). */
+	settings?: {
+		quality?: { min: number; max: number; step: number; default: number };
+	};
+}
+
+const QUALITY_SETTING = { min: 1, max: 100, step: 1, default: 90 } as const;
+
+/** Варианты формата в кнопке Download (селектор рядом с ней). */
+export const OUTPUT_FORMATS: readonly OutputFormatOption[] = [
+	{ mime: "image/png", ext: "png", label: "PNG", supportsAlpha: true },
+	{
+		mime: "image/jpeg",
+		ext: "jpg",
+		label: "JPG",
+		supportsAlpha: false,
+		settings: { quality: QUALITY_SETTING },
+	},
+	{
+		mime: "image/webp",
+		ext: "webp",
+		label: "WebP",
+		supportsAlpha: true,
+		settings: { quality: QUALITY_SETTING },
+	},
+	{ mime: "image/bmp", ext: "bmp", label: "BMP", supportsAlpha: false },
+];
+
+export function outputFormatByMime(mime: OutputMime): OutputFormatOption {
+	const found = OUTPUT_FORMATS.find((f) => f.mime === mime);
+	if (!found) throw new ToolError("errors.encodeUnsupported", { mime });
+	return found;
+}
+
 export const ACCEPTED_IMAGE_TYPES =
 	"image/png,image/jpeg,image/webp,image/gif,image/bmp,image/x-icon";
 

web/src/lib/i18n/en.ts

@@ -75,7 +75,6 @@ export const en: Dict = {
 		result: "Result",
 		previewPanel: "Preview",
 		parts: "parts",
-		format: "Format",
 		alt: "Result image",
 	},
 	paramsCard: {
@@ -100,7 +99,10 @@ export const en: Dict = {
 		generate: "Generate",
 		generating: "Generating…",
 		openImage: "Open image",
-		downloadResult: "Download result",
+		download: "Download",
+		downloadFormat: "Download {format}",
+		formatAria: "Choose download format",
+		alphaLoss: "Result has transparency — {format} will flatten it",
 	},
 	textSource: {
 		placeholder: "Paste base64 / hex / bytes…",

web/src/lib/i18n/ru.ts

@@ -76,7 +76,6 @@ export const ru: Dict = {
 		result: "Результат",
 		previewPanel: "Предпросмотр",
 		parts: "частей",
-		format: "Формат",
 		alt: "Изображение-результат",
 	},
 	paramsCard: {
@@ -101,7 +100,10 @@ export const ru: Dict = {
 		generate: "Сгенерировать",
 		generating: "Генерация…",
 		openImage: "Открыть изображение",
-		downloadResult: "Скачать результат",
+		download: "Скачать",
+		downloadFormat: "Скачать {format}",
+		formatAria: "Выбор формата скачивания",
+		alphaLoss: "В результате есть прозрачность — {format} её уберёт",
 	},
 	textSource: {
 		placeholder: "Вставьте base64 / hex / байты…",