All options

2025-11-11 16:26:20 +00:00 · 2020-11-11 12:12:05 +00:00
parent 196e6e1aea
commit be4601b93a
34 changed files with 2484 additions and 166 deletions
--- a/client-tsconfig.json
+++ b/client-tsconfig.json
@@ -7,12 +7,12 @@
  "include": [
    "src/features/**/client/**/*",
    "src/features/**/shared/**/*",
-    // Not really clean, but we need to access the type of the functions here
+    "src/features/client-utils/**/*",
+    "src/shared/**/*",
+    "src/client/**/*",
+    // Not really clean, but we need these to access the type of the functions
    // for comlink
    "src/features/**/worker/**/*",
-    // And again.
-    "src/features-worker/**/*",
-    "src/shared/**/*",
-    "src/client/**/*"
+    "src/features-worker/**/*"
  ]
 }
--- a/lib/feature-plugin.js
+++ b/lib/feature-plugin.js
@@ -214,6 +214,11 @@ export default function () {
        ([path, name]) => `import * as ${name}ProcessorMeta from '${path}';`,
      ),
      `interface Enableable { enabled: boolean; }`,
+      `export interface ProcessorOptions {`,
+      processorMetaTsNames.map(
+        ([_, name]) => `  ${name}: ${name}ProcessorMeta.Options;`,
+      ),
+      `}`,
      `export interface ProcessorState {`,
      processorMetaTsNames.map(
        ([_, name]) => `  ${name}: Enableable & ${name}ProcessorMeta.Options;`,
--- a/package-lock.json
+++ b/package-lock.json
@@ -2312,6 +2312,12 @@
      "integrity": "sha1-HADHQ7QzzQpOgHWPe2SldEDZ/wA=",
      "dev": true
    },
+    "linkstate": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/linkstate/-/linkstate-1.1.1.tgz",
+      "integrity": "sha512-5SICdxQG9FpWk44wSEoM2WOCUNuYfClp10t51XAIV5E7vUILF/dTYxf0vJw6bW2dUd2wcQon+LkNtRijpNLrig==",
+      "dev": true
+    },
    "lint-staged": {
      "version": "10.4.0",
      "resolved": "https://registry.npmjs.org/lint-staged/-/lint-staged-10.4.0.tgz",
--- a/package.json
+++ b/package.json
@@ -21,6 +21,7 @@
    "file-drop-element": "^1.0.1",
    "husky": "^4.3.0",
    "idb-keyval": "^3.2.0",
+    "linkstate": "^1.1.1",
    "lint-staged": "^10.4.0",
    "lodash.camelcase": "^4.3.0",
    "mime-types": "^2.1.27",
--- a/src/client/lazy-app/Compress/Options/Checkbox/index.tsx
+++ b/src/client/lazy-app/Compress/Options/Checkbox/index.tsx
@@ -0,0 +1,23 @@
+import { h, Component } from 'preact';
+import * as style from './style.css';
+import 'add-css:./styles.css';
+import { UncheckedIcon, CheckedIcon } from '../../../icons';
+
+interface Props extends preact.JSX.HTMLAttributes {}
+interface State {}
+
+export default class Checkbox extends Component<Props, State> {
+  render(props: Props) {
+    return (
+      <div class={style.checkbox}>
+        {props.checked ? (
+          <CheckedIcon class={`${style.icon} ${style.checked}`} />
+        ) : (
+          <UncheckedIcon class={style.icon} />
+        )}
+        {/* @ts-ignore - TS bug https://github.com/microsoft/TypeScript/issues/16019 */}
+        <input class={style.realCheckbox} type="checkbox" {...props} />
+      </div>
+    );
+  }
+}
--- a/src/client/lazy-app/Compress/Options/Checkbox/style.css
+++ b/src/client/lazy-app/Compress/Options/Checkbox/style.css
@@ -0,0 +1,22 @@
+.checkbox {
+  display: inline-block;
+  position: relative;
+  --size: 17px;
+}
+
+.real-checkbox {
+  top: 0;
+  position: absolute;
+  opacity: 0;
+  pointer-events: none;
+}
+
+.icon {
+  display: block;
+  width: var(--size);
+  height: var(--size);
+}
+
+.checked {
+  fill: #34b9eb;
+}
--- a/src/client/lazy-app/Compress/Options/Expander/index.tsx
+++ b/src/client/lazy-app/Compress/Options/Expander/index.tsx
@@ -0,0 +1,80 @@
+import { h, Component, ComponentChild, ComponentChildren } from 'preact';
+import * as style from './style.css';
+import 'add-css:./styles.css';
+import { transitionHeight } from '../../../util';
+
+interface Props {
+  children: ComponentChildren;
+}
+interface State {
+  outgoingChildren: ComponentChild[];
+}
+
+export default class Expander extends Component<Props, State> {
+  state: State = {
+    outgoingChildren: [],
+  };
+  private lastElHeight: number = 0;
+
+  componentWillReceiveProps(nextProps: Props) {
+    const children = this.props.children as ComponentChild[];
+    const nextChildren = nextProps.children as ComponentChild[];
+
+    if (!nextChildren[0] && children[0]) {
+      // Cache the current children for the shrink animation.
+      this.setState({ outgoingChildren: children });
+    }
+  }
+
+  componentWillUpdate(nextProps: Props) {
+    const children = this.props.children as ComponentChild[];
+    const nextChildren = nextProps.children as ComponentChild[];
+
+    // Only interested if going from empty to not-empty, or not-empty to empty.
+    if ((children[0] && nextChildren[0]) || (!children[0] && !nextChildren[0]))
+      return;
+    this.lastElHeight = (this
+      .base as HTMLElement).getBoundingClientRect().height;
+  }
+
+  async componentDidUpdate(previousProps: Props) {
+    const children = this.props.children as ComponentChild[];
+    const previousChildren = previousProps.children as ComponentChild[];
+
+    // Only interested if going from empty to not-empty, or not-empty to empty.
+    if (
+      (children[0] && previousChildren[0]) ||
+      (!children[0] && !previousChildren[0])
+    )
+      return;
+
+    // What height do we need to transition to?
+    (this.base as HTMLElement).style.height = '';
+    (this.base as HTMLElement).style.overflow = 'hidden';
+    const newHeight = children[0]
+      ? (this.base as HTMLElement).getBoundingClientRect().height
+      : 0;
+
+    await transitionHeight(this.base as HTMLElement, {
+      duration: 300,
+      from: this.lastElHeight,
+      to: newHeight,
+    });
+
+    // Unset the height & overflow, so element changes do the right thing.
+    (this.base as HTMLElement).style.height = '';
+    (this.base as HTMLElement).style.overflow = '';
+    if (this.state.outgoingChildren[0]) this.setState({ outgoingChildren: [] });
+  }
+
+  render(props: Props, { outgoingChildren }: State) {
+    const children = props.children as ComponentChild[];
+    const childrenExiting = !children[0] && outgoingChildren[0];
+
+    return (
+      <div class={childrenExiting ? style.childrenExiting : ''}>
+        {children[0] ? children : outgoingChildren}
+      </div>
+    );
+  }
+}
--- a/src/client/lazy-app/Compress/Options/Expander/style.css
+++ b/src/client/lazy-app/Compress/Options/Expander/style.css
@@ -0,0 +1,5 @@
+.children-exiting {
+  & > * {
+    pointer-events: none;
+  }
+}
--- a/src/client/lazy-app/Compress/Options/Range/custom-els/RangeInput/index.ts
+++ b/src/client/lazy-app/Compress/Options/Range/custom-els/RangeInput/index.ts
@@ -0,0 +1,165 @@
+import PointerTracker from 'pointer-tracker';
+import * as style from './style.css';
+import 'add-css:./styles.css';
+
+const RETARGETED_EVENTS = ['focus', 'blur'];
+const UPDATE_EVENTS = ['input', 'change'];
+const REFLECTED_PROPERTIES = [
+  'name',
+  'min',
+  'max',
+  'step',
+  'value',
+  'disabled',
+];
+const REFLECTED_ATTRIBUTES = [
+  'name',
+  'min',
+  'max',
+  'step',
+  'value',
+  'disabled',
+];
+
+function getPrescision(value: string): number {
+  const afterDecimal = value.split('.')[1];
+  return afterDecimal ? afterDecimal.length : 0;
+}
+
+class RangeInputElement extends HTMLElement {
+  private _input: HTMLInputElement;
+  private _valueDisplay?: HTMLDivElement;
+  private _ignoreChange = false;
+
+  static get observedAttributes() {
+    return REFLECTED_ATTRIBUTES;
+  }
+
+  constructor() {
+    super();
+    this._input = document.createElement('input');
+    this._input.type = 'range';
+    this._input.className = style.input;
+
+    const tracker = new PointerTracker(this._input, {
+      start: (): boolean => {
+        if (tracker.currentPointers.length !== 0) return false;
+        this._input.classList.add(style.touchActive);
+        return true;
+      },
+      end: () => {
+        this._input.classList.remove(style.touchActive);
+      },
+    });
+
+    for (const event of RETARGETED_EVENTS) {
+      this._input.addEventListener(event, this._retargetEvent, true);
+    }
+
+    for (const event of UPDATE_EVENTS) {
+      this._input.addEventListener(event, this._update, true);
+    }
+  }
+
+  connectedCallback() {
+    if (this.contains(this._input)) return;
+    this.innerHTML =
+      `<div class="${style.thumbWrapper}">` +
+      `<div class="${style.thumb}"></div>` +
+      `<div class="${style.valueDisplay}"></div>` +
+      '</div>';
+
+    this.insertBefore(this._input, this.firstChild);
+    this._valueDisplay = this.querySelector(
+      '.' + style.valueDisplay,
+    ) as HTMLDivElement;
+    // Set inline styles (this is useful when used with frameworks which might clear inline styles)
+    this._update();
+  }
+
+  get labelPrecision(): string {
+    return this.getAttribute('label-precision') || '';
+  }
+
+  set labelPrecision(precision: string) {
+    this.setAttribute('label-precision', precision);
+  }
+
+  attributeChangedCallback(
+    name: string,
+    oldValue: string,
+    newValue: string | null,
+  ) {
+    if (this._ignoreChange) return;
+    if (newValue === null) {
+      this._input.removeAttribute(name);
+    } else {
+      this._input.setAttribute(name, newValue);
+    }
+    this._reflectAttributes();
+    this._update();
+  }
+
+  private _retargetEvent = (event: Event) => {
+    event.stopImmediatePropagation();
+    const retargetted = new Event(event.type, event);
+    this.dispatchEvent(retargetted);
+  };
+
+  private _update = () => {
+    const value = Number(this.value) || 0;
+    const min = Number(this.min) || 0;
+    const max = Number(this.max) || 100;
+    const labelPrecision =
+      Number(this.labelPrecision) || getPrescision(this.step) || 0;
+    const percent = (100 * (value - min)) / (max - min);
+    const displayValue = labelPrecision
+      ? value.toFixed(labelPrecision)
+      : Math.round(value).toString();
+
+    this._valueDisplay!.textContent = displayValue;
+    this.style.setProperty('--value-percent', percent + '%');
+    this.style.setProperty('--value-width', '' + displayValue.length);
+  };
+
+  private _reflectAttributes() {
+    this._ignoreChange = true;
+    for (const attributeName of REFLECTED_ATTRIBUTES) {
+      if (this._input.hasAttribute(attributeName)) {
+        this.setAttribute(
+          attributeName,
+          this._input.getAttribute(attributeName)!,
+        );
+      } else {
+        this.removeAttribute(attributeName);
+      }
+    }
+    this._ignoreChange = false;
+  }
+}
+
+interface RangeInputElement {
+  name: string;
+  min: string;
+  max: string;
+  step: string;
+  value: string;
+  disabled: boolean;
+}
+
+for (const prop of REFLECTED_PROPERTIES) {
+  Object.defineProperty(RangeInputElement.prototype, prop, {
+    get() {
+      return this._input[prop];
+    },
+    set(val) {
+      this._input[prop] = val;
+      this._reflectAttributes();
+      this._update();
+    },
+  });
+}
+
+export default RangeInputElement;
+
+customElements.define('range-input', RangeInputElement);
--- a/src/client/lazy-app/Compress/Options/Range/custom-els/RangeInput/missing-types.d.ts
+++ b/src/client/lazy-app/Compress/Options/Range/custom-els/RangeInput/missing-types.d.ts
@@ -0,0 +1,9 @@
+declare module 'preact' {
+  namespace createElement.JSX {
+    interface IntrinsicElements {
+      'range-input': HTMLAttributes;
+    }
+  }
+}
+
+export {};
--- a/src/client/lazy-app/Compress/Options/Range/custom-els/RangeInput/styles.css
+++ b/src/client/lazy-app/Compress/Options/Range/custom-els/RangeInput/styles.css
@@ -0,0 +1,98 @@
+range-input {
+  position: relative;
+  display: flex;
+  height: 18px;
+  width: 130px;
+  margin: 2px;
+  font: inherit;
+  line-height: 16px;
+  overflow: visible;
+}
+
+/* Disabled inputs are greyed out */
+range-input[disabled] {
+  filter: grayscale(1);
+}
+
+range-input::before {
+  content: '';
+  display: block;
+  position: absolute;
+  top: 8px;
+  left: 0;
+  width: 100%;
+  height: 2px;
+  border-radius: 1px;
+  box-shadow: 0 -0.5px 0 rgba(0, 0, 0, 0.3),
+    inset 0 0.5px 0 rgba(255, 255, 255, 0.2), 0 0.5px 0 rgba(255, 255, 255, 0.3);
+  background: linear-gradient(#34b9eb, #218ab1) 0 / var(--value-percent, 0%)
+    100% no-repeat #eee;
+}
+
+.input {
+  position: relative;
+  width: 100%;
+  padding: 0;
+  margin: 0;
+  opacity: 0;
+}
+
+.thumb {
+  pointer-events: none;
+  position: absolute;
+  bottom: 3px;
+  left: var(--value-percent, 0%);
+  margin-left: -6px;
+  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="10" height="10"><circle cx="5" cy="5" r="1" fill="%235D509E" /></svg>')
+    center no-repeat #34b9eb;
+  border-radius: 50%;
+  width: 12px;
+  height: 12px;
+  box-shadow: 0 0.5px 2px rgba(0, 0, 0, 0.3);
+}
+
+.thumb-wrapper {
+  position: absolute;
+  left: 6px;
+  right: 6px;
+  bottom: 0;
+  height: 0;
+  overflow: visible;
+}
+
+.value-display {
+  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="32" height="62" fill="none"><path fill="%2334B9EB" d="M27.3 27.3C25 29.6 17 35.8 17 43v3c0 3 2.5 5 3.2 5.8a6 6 0 1 1-8.5 0C12.6 51 15 49 15 46v-3c0-7.2-8-13.4-10.3-15.7A16 16 0 0 1 16 0a16 16 0 0 1 11.3 27.3z"/><circle cx="16" cy="56" r="1" fill="%235D509E"/></svg>')
+    top center no-repeat;
+  position: absolute;
+  box-sizing: border-box;
+  left: var(--value-percent, 0%);
+  bottom: 3px;
+  width: 32px;
+  height: 62px;
+  text-align: center;
+  padding: 8px 3px 0;
+  margin: 0 0 0 -16px;
+  filter: drop-shadow(0 1px 3px rgba(0, 0, 0, 0.3));
+  transform-origin: 50% 90%;
+  opacity: 0.0001;
+  transform: scale(0.2);
+  color: #fff;
+  font: inherit;
+  font-size: calc(100% - var(--value-width, 3) / 5 * 0.2em);
+  text-overflow: clip;
+  text-shadow: 0 -0.5px 0 rgba(0, 0, 0, 0.4);
+  transition: all 200ms ease;
+  transition-property: opacity, transform;
+  will-change: transform;
+  pointer-events: none;
+  overflow: hidden;
+}
+
+.touch-active + .thumb-wrapper .value-display {
+  opacity: 1;
+  transform: scale(1);
+}
+
+.touch-active + .thumb-wrapper .thumb {
+  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
+}
--- a/src/client/lazy-app/Compress/Options/Range/index.tsx
+++ b/src/client/lazy-app/Compress/Options/Range/index.tsx
@@ -0,0 +1,55 @@
+import { h, Component } from 'preact';
+import * as style from './style.css';
+import 'add-css:./styles.css';
+import RangeInputElement from './custom-els/RangeInput';
+import '../../custom-els/RangeInput';
+import { linkRef } from 'shared/initial-app/util';
+
+interface Props extends preact.JSX.HTMLAttributes {}
+interface State {}
+
+export default class Range extends Component<Props, State> {
+  rangeWc?: RangeInputElement;
+
+  private onTextInput = (event: Event) => {
+    const input = event.target as HTMLInputElement;
+    const value = input.value.trim();
+    if (!value) return;
+    this.rangeWc!.value = input.value;
+    this.rangeWc!.dispatchEvent(
+      new InputEvent('input', {
+        bubbles: event.bubbles,
+      }),
+    );
+  };
+
+  render(props: Props) {
+    const { children, ...otherProps } = props;
+
+    const { value, min, max, step } = props;
+
+    return (
+      <label class={style.range}>
+        <span class={style.labelText}>{children}</span>
+        {/* On interaction, Safari gives focus to the first element in the label, so the
+        <range-input> is deliberately first. */}
+        <div class={style.rangeWcContainer}>
+          <range-input
+            ref={linkRef(this, 'rangeWc')}
+            class={style.rangeWc}
+            {...otherProps}
+          />
+        </div>
+        <input
+          type="number"
+          class={style.textInput}
+          value={value}
+          min={min}
+          max={max}
+          step={step}
+          onInput={this.onTextInput}
+        />
+      </label>
+    );
+  }
+}
--- a/src/client/lazy-app/Compress/Options/Range/style.css
+++ b/src/client/lazy-app/Compress/Options/Range/style.css
@@ -0,0 +1,55 @@
+.range {
+  position: relative;
+  z-index: 0;
+  display: grid;
+  grid-template-columns: 1fr auto;
+}
+
+.label-text {
+  color: #fff; /* TEMP */
+}
+
+.range-wc-container {
+  position: relative;
+  z-index: 1;
+  grid-row: 2 / 3;
+  grid-column: 1 / 3;
+}
+
+.range-wc {
+  width: 100%;
+}
+
+.text-input {
+  grid-row: 1 / 2;
+  grid-column: 2 / 3;
+
+  text-align: right;
+  background: transparent;
+  color: inherit;
+  font: inherit;
+  border: none;
+  padding: 2px 5px;
+  box-sizing: border-box;
+  text-decoration: underline;
+  text-decoration-style: dotted;
+  text-underline-position: under;
+  width: 48px;
+  position: relative;
+  left: 5px;
+
+  &:focus {
+    background: #fff;
+    color: #000;
+  }
+
+  // Remove the number controls
+  -moz-appearance: textfield;
+
+  &::-webkit-outer-spin-button,
+  &::-webkit-inner-spin-button {
+    -moz-appearance: none;
+    -webkit-appearance: none;
+    margin: 0;
+  }
+}
--- a/src/client/lazy-app/Compress/Options/Select/index.tsx
+++ b/src/client/lazy-app/Compress/Options/Select/index.tsx
@@ -0,0 +1,27 @@
+import { h, Component } from 'preact';
+import * as style from './style.css';
+import 'add-css:./styles.css';
+
+interface Props extends preact.JSX.HTMLAttributes {
+  large?: boolean;
+}
+interface State {}
+
+export default class Select extends Component<Props, State> {
+  render(props: Props) {
+    const { large, ...otherProps } = props;
+
+    return (
+      <div class={style.select}>
+        {/* @ts-ignore - TS bug https://github.com/microsoft/TypeScript/issues/16019 */}
+        <select
+          class={`${style.builtinSelect} ${large ? style.large : ''}`}
+          {...otherProps}
+        />
+        <svg class={style.arrow} viewBox="0 0 10 5">
+          <path d="M0 0l5 5 5-5z" />
+        </svg>
+      </div>
+    );
+  }
+}
--- a/src/client/lazy-app/Compress/Options/Select/style.css
+++ b/src/client/lazy-app/Compress/Options/Select/style.css
@@ -0,0 +1,33 @@
+.select {
+  position: relative;
+}
+
+.builtin-select {
+  background: #2f2f2f;
+  border-radius: 4px;
+  font: inherit;
+  padding: 4px 25px 4px 10px;
+  -webkit-appearance: none;
+  -moz-appearance: none;
+  border: none;
+  color: #fff;
+  width: 100%;
+}
+
+.arrow {
+  position: absolute;
+  right: 8px;
+  top: 50%;
+  transform: translateY(-50%);
+  fill: #fff;
+  width: 10px;
+}
+
+.large {
+  padding: 10px 35px 10px 10px;
+  background: #151515;
+
+  & .arrow {
+    right: 13px;
+  }
+}
--- a/src/client/lazy-app/Compress/Options/index.tsx
+++ b/src/client/lazy-app/Compress/Options/index.tsx
@@ -0,0 +1,190 @@
+import { h, Component } from 'preact';
+
+import * as style from './style.css';
+import 'add-css:./styles.css';
+import { cleanSet, cleanMerge } from '../../util/clean-modify';
+
+import type { SourceImage, OutputType } from '..';
+import {
+  EncoderOptions,
+  EncoderState,
+  ProcessorState,
+  ProcessorOptions,
+  encoderMap,
+} from '../../feature-meta';
+import Expander from './Expander';
+import Checkbox from './Checkbox';
+import Select from './Select';
+import { Options as QuantOptionsComponent } from 'features/processors/quantize/client';
+import { Options as ResizeOptionsComponent } from 'features/processors/resize/client';
+
+interface Props {
+  mobileView: boolean;
+  source?: SourceImage;
+  encoderState?: EncoderState;
+  processorState: ProcessorState;
+  onEncoderTypeChange(newType: OutputType): void;
+  onEncoderOptionsChange(newOptions: EncoderOptions): void;
+  onProcessorOptionsChange(newOptions: ProcessorState): void;
+}
+
+interface State {
+  supportedEncoderMap?: PartialButNotUndefined<typeof encoderMap>;
+}
+
+type PartialButNotUndefined<T> = {
+  [P in keyof T]: T[P];
+};
+
+const supportedEncoderMapP: Promise<PartialButNotUndefined<
+  typeof encoderMap
+>> = (async () => {
+  const supportedEncoderMap: PartialButNotUndefined<typeof encoderMap> = {
+    ...encoderMap,
+  };
+
+  // Filter out entries where the feature test fails
+  await Promise.all(
+    Object.entries(encoderMap).map(async ([encoderName, details]) => {
+      if ('featureTest' in details && !(await details.featureTest())) {
+        delete supportedEncoderMap[encoderName as keyof typeof encoderMap];
+      }
+    }),
+  );
+
+  return supportedEncoderMap;
+})();
+
+export default class Options extends Component<Props, State> {
+  state: State = {
+    supportedEncoderMap: undefined,
+  };
+
+  constructor() {
+    super();
+    supportedEncoderMapP.then((supportedEncoderMap) =>
+      this.setState({ supportedEncoderMap }),
+    );
+  }
+
+  private onEncoderTypeChange = (event: Event) => {
+    const el = event.currentTarget as HTMLSelectElement;
+
+    // The select element only has values matching encoder types,
+    // so 'as' is safe here.
+    const type = el.value as OutputType;
+    this.props.onEncoderTypeChange(type);
+  };
+
+  private onProcessorEnabledChange = (event: Event) => {
+    const el = event.currentTarget as HTMLInputElement;
+    const processor = el.name.split('.')[0] as keyof ProcessorState;
+
+    this.props.onProcessorOptionsChange(
+      cleanSet(this.props.processorState, `${processor}.enabled`, el.checked),
+    );
+  };
+
+  private onQuantizerOptionsChange = (opts: ProcessorOptions['quantize']) => {
+    this.props.onProcessorOptionsChange(
+      cleanMerge(this.props.processorState, 'quantizer', opts),
+    );
+  };
+
+  private onResizeOptionsChange = (opts: ProcessorOptions['resize']) => {
+    this.props.onProcessorOptionsChange(
+      cleanMerge(this.props.processorState, 'resize', opts),
+    );
+  };
+
+  render(
+    { source, encoderState, processorState, onEncoderOptionsChange }: Props,
+    { supportedEncoderMap }: State,
+  ) {
+    const encoder = encoderState && encoderMap[encoderState.type];
+    const EncoderOptionComponent =
+      encoder && 'Options' in encoder ? encoder.Options : undefined;
+
+    return (
+      <div class={style.optionsScroller}>
+        <Expander>
+          {!encoderState ? null : (
+            <div>
+              <h3 class={style.optionsTitle}>Edit</h3>
+              <label class={style.sectionEnabler}>
+                <Checkbox
+                  name="resize.enable"
+                  checked={!!processorState.resize.enabled}
+                  onChange={this.onProcessorEnabledChange}
+                />
+                Resize
+              </label>
+              <Expander>
+                {processorState.resize.enabled ? (
+                  <ResizeOptionsComponent
+                    isVector={Boolean(source && source.vectorImage)}
+                    inputWidth={source ? source.preprocessed.width : 1}
+                    inputHeight={source ? source.preprocessed.height : 1}
+                    options={processorState.resize}
+                    onChange={this.onResizeOptionsChange}
+                  />
+                ) : null}
+              </Expander>
+
+              <label class={style.sectionEnabler}>
+                <Checkbox
+                  name="quantizer.enable"
+                  checked={!!processorState.quantize.enabled}
+                  onChange={this.onProcessorEnabledChange}
+                />
+                Reduce palette
+              </label>
+              <Expander>
+                {processorState.quantize.enabled ? (
+                  <QuantOptionsComponent
+                    options={processorState.quantize}
+                    onChange={this.onQuantizerOptionsChange}
+                  />
+                ) : null}
+              </Expander>
+            </div>
+          )}
+        </Expander>
+
+        <h3 class={style.optionsTitle}>Compress</h3>
+
+        <section class={`${style.optionOneCell} ${style.optionsSection}`}>
+          {supportedEncoderMap ? (
+            <Select
+              value={encoderState ? encoderState.type : ''}
+              onChange={this.onEncoderTypeChange}
+              large
+            >
+              <option value="">Original Image</option>
+              {Object.entries(supportedEncoderMap).map(([type, encoder]) => (
+                <option value={type}>{encoder.meta.label}</option>
+              ))}
+            </Select>
+          ) : (
+            <Select large>
+              <option>Loading…</option>
+            </Select>
+          )}
+        </section>
+
+        <Expander>
+          {EncoderOptionComponent && encoderState && (
+            <EncoderOptionComponent
+              options={
+                // Casting options, as encoderOptionsComponentMap[encodeData.type] ensures
+                // the correct type, but typescript isn't smart enough.
+                encoderState.options as any
+              }
+              onChange={onEncoderOptionsChange}
+            />
+          )}
+        </Expander>
+      </div>
+    );
+  }
+}
--- a/src/client/lazy-app/Compress/Options/style.css
+++ b/src/client/lazy-app/Compress/Options/style.css
@@ -0,0 +1,58 @@
+.options-scroller {
+  overflow-x: hidden;
+  overflow-y: auto;
+  -webkit-overflow-scrolling: touch;
+  --horizontal-padding: 15px;
+}
+
+.options-title {
+  background: rgba(0, 0, 0, 0.9);
+  margin: 0;
+  padding: 10px var(--horizontal-padding);
+  font-weight: normal;
+  font-size: 1.4rem;
+  border-bottom: 1px solid #000;
+}
+
+.option-text-first {
+  display: grid;
+  align-items: center;
+  grid-template-columns: 87px 1fr;
+  grid-gap: 0.7em;
+  padding: 10px var(--horizontal-padding);
+}
+
+.option-one-cell {
+  display: grid;
+  grid-template-columns: 1fr;
+  padding: 10px var(--horizontal-padding);
+}
+
+.option-input-first,
+.section-enabler {
+  cursor: pointer;
+  display: grid;
+  align-items: center;
+  grid-template-columns: auto 1fr;
+  grid-gap: 0.7em;
+  padding: 10px var(--horizontal-padding);
+}
+
+.section-enabler {
+  background: rgba(0, 0, 0, 0.8);
+}
+
+.options-section {
+  background: rgba(0, 0, 0, 0.7);
+}
+
+.text-field {
+  background: #fff;
+  color: #000;
+  font: inherit;
+  border: none;
+  padding: 2px 0 2px 10px;
+  width: 100%;
+  box-sizing: border-box;
+  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.5);
+}
--- a/src/client/lazy-app/Compress/Output/style.css
+++ b/src/client/lazy-app/Compress/Output/style.css
@@ -1,5 +1,5 @@
 .output {
-  composes: abs-fill from '../../../../shared/initial-app/util.scss';
+  composes: abs-fill from '../../../../shared/initial-app/util.css';

  &::before {
    content: '';
@@ -19,12 +19,12 @@
 }

 .two-up {
-  composes: abs-fill from '../../../../shared/initial-app/util.scss';
+  composes: abs-fill from '../../../../shared/initial-app/util.css';
  --accent-color: var(--button-fg);
 }

 .pinch-zoom {
-  composes: abs-fill from '../../../../shared/initial-app/util.scss';
+  composes: abs-fill from '../../../../shared/initial-app/util.css';
  outline: none;
  display: flex;
  justify-content: center;
@@ -32,11 +32,11 @@
 }

 .pinch-target {
-  // This fixes a severe painting bug in Chrome.
-  // We should try to remove this once the issue is fixed.
-  // https://bugs.chromium.org/p/chromium/issues/detail?id=870222#c10
+  /* This fixes a severe painting bug in Chrome.
+   * We should try to remove this once the issue is fixed.
+   * https://bugs.chromium.org/p/chromium/issues/detail?id=870222#c10 */
  will-change: auto;
-  // Prevent the image becoming misshapen due to default flexbox layout.
+  /* Prevent the image becoming misshapen due to default flexbox layout. */
  flex-shrink: 0;
 }

@@ -52,7 +52,7 @@
  flex-wrap: wrap;
  contain: content;

-  // Allow clicks to fall through to the pinch zoom area
+  /* Allow clicks to fall through to the pinch zoom area */
  pointer-events: none;
  & > * {
    pointer-events: auto;
--- a/src/client/lazy-app/Compress/index.tsx
+++ b/src/client/lazy-app/Compress/index.tsx
@@ -27,13 +27,14 @@ import Options from './Options';
 import ResultCache from './result-cache';
 import { cleanMerge, cleanSet } from '../util/clean-modify';
 import './custom-els/MultiPanel';
+// TODO: you are here
 import Results from '../results';
-import { ExpandIcon, CopyAcrossIconProps } from '../../lib/icons';
-import SnackBarElement from '../../lib/SnackBar';
 import WorkerBridge from '../worker-bridge';
 import { resize } from 'features/processors/resize/client';
+import type SnackBarElement from 'shared/initial-app/custom-els/snack-bar';
+import { CopyAcrossIconProps, ExpandIcon } from '../icons';

-type OutputType = EncoderType | 'identity';
+export type OutputType = EncoderType | 'identity';

 export interface SourceImage {
  file: File;
@@ -761,7 +762,7 @@ export default class Compress extends Component<Props, State> {
      <Options
        source={source}
        mobileView={mobileView}
-        preprocessorState={side.latestSettings.processorState}
+        processorState={side.latestSettings.processorState}
        encoderState={side.latestSettings.encoderState}
        onEncoderTypeChange={this.onEncoderTypeChange.bind(
          this,
@@ -771,7 +772,7 @@ export default class Compress extends Component<Props, State> {
          this,
          index as 0 | 1,
        )}
-        onPreprocessorOptionsChange={this.onProcessorOptionsChange.bind(
+        onProcessorOptionsChange={this.onProcessorOptionsChange.bind(
          this,
          index as 0 | 1,
        )}
--- a/src/features/README.md
+++ b/src/features/README.md
@@ -41,9 +41,9 @@ Encoders must have the following:
 - `EncodeOptions` - An interface for the codec's options.
 - `defaultOptions` - An object of type `EncodeOptions`.

-`client/index.ts` which exposes the following.
+`client/index.ts` which exposes the following:

- `encode` - A method which takes args
+- `encode` - A method which takes args:
  - `AbortSignal`
  - `WorkerBridge`
  - `ImageData`
@@ -51,4 +51,15 @@ Encoders must have the following:

 And returns (a promise for) an `ArrayBuffer`.

-Optionally it may include a method `featureTest`, which returns a boolean indicating support for this decoder.
+Optionally it may export a method `featureTest`, which returns a boolean indicating support for this decoder.
+
+Optionally it may export a component, `Options`, with the following props:
+
+```ts
+interface Props {
+  options: EncodeOptions;
+  onChange(newOptions: EncodeOptions): void;
+}
+```
+
+…where `EncodeOptions` are the options for that encoder.
--- a/src/features/client-utils/index.tsx
+++ b/src/features/client-utils/index.tsx
@@ -0,0 +1,58 @@
+import { h, Component } from 'preact';
+import * as style from 'client/lazy-app/Compress/Options/style.css';
+import Range from 'client/lazy-app/Compress/Options/Range';
+
+interface EncodeOptions {
+  quality: number;
+}
+
+interface Props {
+  options: EncodeOptions;
+  onChange(newOptions: EncodeOptions): void;
+}
+
+interface QualityOptionArg {
+  min?: number;
+  max?: number;
+  step?: number;
+}
+
+type Constructor<T extends {} = {}> = new (...args: any[]) => T;
+
+// TypeScript requires an exported type for returned classes. This serves as the
+// type for the class returned by `qualityOption`.
+export interface QualityOptionsInterface extends Component<Props, {}> {}
+
+export function qualityOption(
+  opts: QualityOptionArg = {},
+): Constructor<QualityOptionsInterface> {
+  const { min = 0, max = 100, step = 1 } = opts;
+
+  class QualityOptions extends Component<Props, {}> {
+    onChange = (event: Event) => {
+      const el = event.currentTarget as HTMLInputElement;
+      this.props.onChange({ quality: Number(el.value) });
+    };
+
+    render({ options }: Props) {
+      return (
+        <div class={style.optionsSection}>
+          <div class={style.optionOneCell}>
+            <Range
+              name="quality"
+              min={min}
+              max={max}
+              step={step || 'any'}
+              value={options.quality}
+              onInput={this.onChange}
+            >
+              Quality:
+            </Range>
+          </div>
+        </div>
+      );
+    }
+  }
+
+  return QualityOptions;
+}
--- a/src/features/encoders/avif/client/index.ts
+++ b/src/features/encoders/avif/client/index.ts
@@ -1,9 +0,0 @@
-import { EncodeOptions } from '../shared/meta';
-import type WorkerBridge from 'client/lazy-app/worker-bridge';
-
-export const encode = (
-  signal: AbortSignal,
-  workerBridge: WorkerBridge,
-  imageData: ImageData,
-  options: EncodeOptions,
-) => workerBridge.avifEncode(signal, imageData, options);
--- a/src/features/encoders/avif/client/index.tsx
+++ b/src/features/encoders/avif/client/index.tsx
@@ -0,0 +1,361 @@
+import { EncodeOptions, defaultOptions } from '../shared/meta';
+import type WorkerBridge from 'client/lazy-app/worker-bridge';
+import { h, Component } from 'preact';
+import { preventDefault, shallowEqual } from 'client/lazy-app/util';
+import * as style from 'client/lazy-app/Compress/Options/style.css';
+import Checkbox from 'client/lazy-app/Compress/Options/Checkbox';
+import Expander from 'client/lazy-app/Compress/Options/Expander';
+import Select from 'client/lazy-app/Compress/Options/Select';
+import Range from 'client/lazy-app/Compress/Options/Range';
+import linkState from 'linkstate';
+
+export const encode = (
+  signal: AbortSignal,
+  workerBridge: WorkerBridge,
+  imageData: ImageData,
+  options: EncodeOptions,
+) => workerBridge.avifEncode(signal, imageData, options);
+
+interface Props {
+  options: EncodeOptions;
+  onChange(newOptions: EncodeOptions): void;
+}
+
+interface State {
+  options: EncodeOptions;
+  lossless: boolean;
+  maxQuality: number;
+  minQuality: number;
+  separateAlpha: boolean;
+  losslessAlpha: boolean;
+  maxAlphaQuality: number;
+  minAlphaQuality: number;
+  showAdvanced: boolean;
+  grayscale: boolean;
+  subsample: number;
+  tileRows: number;
+  tileCols: number;
+  effort: number;
+}
+
+const maxQuant = 63;
+const maxSpeed = 10;
+
+export class Options extends Component<Props, State> {
+  static getDerivedStateFromProps(
+    props: Props,
+    state: State,
+  ): Partial<State> | null {
+    if (state.options && shallowEqual(state.options, props.options)) {
+      return null;
+    }
+
+    const { options } = props;
+
+    const lossless = options.maxQuantizer === 0 && options.minQuantizer === 0;
+    const minQuantizerValue = lossless
+      ? defaultOptions.minQuantizer
+      : options.minQuantizer;
+    const maxQuantizerValue = lossless
+      ? defaultOptions.maxQuantizer
+      : options.maxQuantizer;
+    const losslessAlpha =
+      options.maxQuantizerAlpha === 0 && options.minQuantizerAlpha === 0;
+    const minQuantizerAlphaValue = losslessAlpha
+      ? defaultOptions.minQuantizerAlpha
+      : options.minQuantizerAlpha;
+    const maxQuantizerAlphaValue = losslessAlpha
+      ? defaultOptions.maxQuantizerAlpha
+      : options.maxQuantizerAlpha;
+
+    // Create default form state from options
+    return {
+      options,
+      lossless,
+      losslessAlpha,
+      maxQuality: maxQuant - minQuantizerValue,
+      minQuality: maxQuant - maxQuantizerValue,
+      separateAlpha:
+        options.maxQuantizer !== options.maxQuantizerAlpha ||
+        options.minQuantizer !== options.minQuantizerAlpha,
+      maxAlphaQuality: maxQuant - minQuantizerAlphaValue,
+      minAlphaQuality: maxQuant - maxQuantizerAlphaValue,
+      grayscale: options.subsample === 0,
+      subsample:
+        options.subsample === 0 || lossless
+          ? defaultOptions.subsample
+          : options.subsample,
+      tileRows: options.tileRowsLog2,
+      tileCols: options.tileColsLog2,
+      effort: maxSpeed - options.speed,
+    };
+  }
+
+  // The rest of the defaults are set in getDerivedStateFromProps
+  state: State = {
+    showAdvanced: false,
+  } as State;
+
+  private _inputChangeCallbacks = new Map<string, (event: Event) => void>();
+
+  private _inputChange = (prop: keyof State, type: 'number' | 'boolean') => {
+    // Cache the callback for performance
+    if (!this._inputChangeCallbacks.has(prop)) {
+      this._inputChangeCallbacks.set(prop, (event: Event) => {
+        const formEl = event.target as HTMLInputElement | HTMLSelectElement;
+        const newVal =
+          type === 'boolean'
+            ? 'checked' in formEl
+              ? formEl.checked
+              : !!formEl.value
+            : Number(formEl.value);
+
+        const newState: Partial<State> = {
+          [prop]: newVal,
+        };
+
+        // Ensure that min cannot be greater than max
+        switch (prop) {
+          case 'maxQuality':
+            if (newVal < this.state.minQuality) {
+              newState.minQuality = newVal as number;
+            }
+            break;
+          case 'minQuality':
+            if (newVal > this.state.maxQuality) {
+              newState.maxQuality = newVal as number;
+            }
+            break;
+          case 'maxAlphaQuality':
+            if (newVal < this.state.minAlphaQuality) {
+              newState.minAlphaQuality = newVal as number;
+            }
+            break;
+          case 'minAlphaQuality':
+            if (newVal > this.state.maxAlphaQuality) {
+              newState.maxAlphaQuality = newVal as number;
+            }
+            break;
+        }
+
+        const optionState = {
+          ...this.state,
+          ...newState,
+        };
+
+        const maxQuantizer = optionState.lossless
+          ? 0
+          : maxQuant - optionState.minQuality;
+        const minQuantizer = optionState.lossless
+          ? 0
+          : maxQuant - optionState.maxQuality;
+
+        const newOptions: EncodeOptions = {
+          maxQuantizer,
+          minQuantizer,
+          maxQuantizerAlpha: optionState.separateAlpha
+            ? optionState.losslessAlpha
+              ? 0
+              : maxQuant - optionState.minAlphaQuality
+            : maxQuantizer,
+          minQuantizerAlpha: optionState.separateAlpha
+            ? optionState.losslessAlpha
+              ? 0
+              : maxQuant - optionState.maxAlphaQuality
+            : minQuantizer,
+          // Always set to 4:4:4 if lossless
+          subsample: optionState.grayscale
+            ? 0
+            : optionState.lossless
+            ? 3
+            : optionState.subsample,
+          tileColsLog2: optionState.tileCols,
+          tileRowsLog2: optionState.tileRows,
+          speed: maxSpeed - optionState.effort,
+        };
+
+        // Updating options, so we don't recalculate in getDerivedStateFromProps.
+        newState.options = newOptions;
+
+        this.setState(
+          // It isn't clear to me why I have to cast this :)
+          newState as State,
+        );
+
+        this.props.onChange(newOptions);
+      });
+    }
+
+    return this._inputChangeCallbacks.get(prop)!;
+  };
+
+  render(
+    _: Props,
+    {
+      effort,
+      grayscale,
+      lossless,
+      losslessAlpha,
+      maxAlphaQuality,
+      maxQuality,
+      minAlphaQuality,
+      minQuality,
+      separateAlpha,
+      showAdvanced,
+      subsample,
+      tileCols,
+      tileRows,
+    }: State,
+  ) {
+    return (
+      <form class={style.optionsSection} onSubmit={preventDefault}>
+        <label class={style.optionInputFirst}>
+          <Checkbox
+            checked={lossless}
+            onChange={this._inputChange('lossless', 'boolean')}
+          />
+          Lossless
+        </label>
+        <Expander>
+          {!lossless && (
+            <div>
+              <div class={style.optionOneCell}>
+                <Range
+                  min="0"
+                  max="62"
+                  value={maxQuality}
+                  onInput={this._inputChange('maxQuality', 'number')}
+                >
+                  Max quality:
+                </Range>
+              </div>
+              <div class={style.optionOneCell}>
+                <Range
+                  min="0"
+                  max="62"
+                  value={minQuality}
+                  onInput={this._inputChange('minQuality', 'number')}
+                >
+                  Min quality:
+                </Range>
+              </div>
+            </div>
+          )}
+        </Expander>
+        <label class={style.optionInputFirst}>
+          <Checkbox
+            checked={separateAlpha}
+            onChange={this._inputChange('separateAlpha', 'boolean')}
+          />
+          Separate alpha quality
+        </label>
+        <Expander>
+          {separateAlpha && (
+            <div>
+              <label class={style.optionInputFirst}>
+                <Checkbox
+                  checked={losslessAlpha}
+                  onChange={this._inputChange('losslessAlpha', 'boolean')}
+                />
+                Lossless alpha
+              </label>
+              <Expander>
+                {!losslessAlpha && (
+                  <div>
+                    <div class={style.optionOneCell}>
+                      <Range
+                        min="0"
+                        max="62"
+                        value={maxAlphaQuality}
+                        onInput={this._inputChange('maxAlphaQuality', 'number')}
+                      >
+                        Max alpha quality:
+                      </Range>
+                    </div>
+                    <div class={style.optionOneCell}>
+                      <Range
+                        min="0"
+                        max="62"
+                        value={minAlphaQuality}
+                        onInput={this._inputChange('minAlphaQuality', 'number')}
+                      >
+                        Min alpha quality:
+                      </Range>
+                    </div>
+                  </div>
+                )}
+              </Expander>
+            </div>
+          )}
+        </Expander>
+        <label class={style.optionInputFirst}>
+          <Checkbox
+            checked={showAdvanced}
+            onChange={linkState(this, 'showAdvanced')}
+          />
+          Show advanced settings
+        </label>
+        <Expander>
+          {showAdvanced && (
+            <div>
+              {/*<label class={style.optionInputFirst}>
+                <Checkbox
+                  data-set-state="grayscale"
+                  checked={grayscale}
+                  onChange={this._inputChange('grayscale', 'boolean')}
+                />
+                Grayscale
+              </label>*/}
+              <Expander>
+                {!grayscale && !lossless && (
+                  <label class={style.optionTextFirst}>
+                    Subsample chroma:
+                    <Select
+                      data-set-state="subsample"
+                      value={subsample}
+                      onChange={this._inputChange('subsample', 'number')}
+                    >
+                      <option value="1">4:2:0</option>
+                      {/*<option value="2">4:2:2</option>*/}
+                      <option value="3">4:4:4</option>
+                    </Select>
+                  </label>
+                )}
+              </Expander>
+              <div class={style.optionOneCell}>
+                <Range
+                  min="0"
+                  max="6"
+                  value={tileRows}
+                  onInput={this._inputChange('tileRows', 'number')}
+                >
+                  Log2 of tile rows:
+                </Range>
+              </div>
+              <div class={style.optionOneCell}>
+                <Range
+                  min="0"
+                  max="6"
+                  value={tileCols}
+                  onInput={this._inputChange('tileCols', 'number')}
+                >
+                  Log2 of tile cols:
+                </Range>
+              </div>
+            </div>
+          )}
+        </Expander>
+        <div class={style.optionOneCell}>
+          <Range
+            min="0"
+            max="10"
+            value={effort}
+            onInput={this._inputChange('effort', 'number')}
+          >
+            Effort:
+          </Range>
+        </div>
+      </form>
+    );
+  }
+}
--- a/src/features/encoders/avif/client/missing-types.d.ts
+++ b/src/features/encoders/avif/client/missing-types.d.ts
@@ -1,13 +0,0 @@
-/**
- * Copyright 2020 Google Inc. All Rights Reserved.
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *     http://www.apache.org/licenses/LICENSE-2.0
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-/// <reference path="../../../../../missing-types.d.ts" />
--- a/src/features/encoders/browserJPEG/client/index.ts
+++ b/src/features/encoders/browserJPEG/client/index.ts
@@ -1,5 +1,6 @@
 import { canvasEncode } from 'client/lazy-app/util';
 import WorkerBridge from 'client/lazy-app/worker-bridge';
+import { qualityOption } from 'features/client-utils';
 import { mimeType, EncodeOptions } from '../shared/meta';

 export const encode = (
@@ -8,3 +9,5 @@ export const encode = (
  imageData: ImageData,
  options: EncodeOptions,
 ) => canvasEncode(imageData, mimeType, options.quality);
+
+export const Options = qualityOption({ min: 0, max: 1, step: 0.01 });
--- a/src/features/encoders/mozjpeg/client/index.ts
+++ b/src/features/encoders/mozjpeg/client/index.ts
@@ -1,11 +0,0 @@
-import { EncodeOptions } from '../shared/meta';
-import type WorkerBridge from 'client/lazy-app/worker-bridge';
-
-export function encode(
-  signal: AbortSignal,
-  workerBridge: WorkerBridge,
-  imageData: ImageData,
-  options: EncodeOptions,
-) {
-  return workerBridge.mozjpegEncode(signal, imageData, options);
-}
--- a/src/features/encoders/mozjpeg/client/index.tsx
+++ b/src/features/encoders/mozjpeg/client/index.tsx
@@ -0,0 +1,299 @@
+import { EncodeOptions, MozJpegColorSpace } from '../shared/meta';
+import type WorkerBridge from 'client/lazy-app/worker-bridge';
+import { h, Component } from 'preact';
+import {
+  inputFieldChecked,
+  inputFieldValueAsNumber,
+  preventDefault,
+} from 'client/lazy-app/util';
+import * as style from 'client/lazy-app/Compress/Options/style.css';
+import linkState from 'linkstate';
+import Range from 'client/lazy-app/Compress/Options/Range';
+import Checkbox from 'client/lazy-app/Compress/Options/Checkbox';
+import Expander from 'client/lazy-app/Compress/Options/Expander';
+import Select from 'client/lazy-app/Compress/Options/Select';
+
+export function encode(
+  signal: AbortSignal,
+  workerBridge: WorkerBridge,
+  imageData: ImageData,
+  options: EncodeOptions,
+) {
+  return workerBridge.mozjpegEncode(signal, imageData, options);
+}
+
+interface Props {
+  options: EncodeOptions;
+  onChange(newOptions: EncodeOptions): void;
+}
+
+interface State {
+  showAdvanced: boolean;
+}
+
+export class Options extends Component<Props, State> {
+  state: State = {
+    showAdvanced: false,
+  };
+
+  onChange = (event: Event) => {
+    const form = (event.currentTarget as HTMLInputElement).closest(
+      'form',
+    ) as HTMLFormElement;
+    const { options } = this.props;
+
+    const newOptions: EncodeOptions = {
+      // Copy over options the form doesn't currently care about, eg arithmetic
+      ...this.props.options,
+      // And now stuff from the form:
+      // .checked
+      baseline: inputFieldChecked(form.baseline, options.baseline),
+      progressive: inputFieldChecked(form.progressive, options.progressive),
+      optimize_coding: inputFieldChecked(
+        form.optimize_coding,
+        options.optimize_coding,
+      ),
+      trellis_multipass: inputFieldChecked(
+        form.trellis_multipass,
+        options.trellis_multipass,
+      ),
+      trellis_opt_zero: inputFieldChecked(
+        form.trellis_opt_zero,
+        options.trellis_opt_zero,
+      ),
+      trellis_opt_table: inputFieldChecked(
+        form.trellis_opt_table,
+        options.trellis_opt_table,
+      ),
+      auto_subsample: inputFieldChecked(
+        form.auto_subsample,
+        options.auto_subsample,
+      ),
+      separate_chroma_quality: inputFieldChecked(
+        form.separate_chroma_quality,
+        options.separate_chroma_quality,
+      ),
+      // .value
+      quality: inputFieldValueAsNumber(form.quality, options.quality),
+      chroma_quality: inputFieldValueAsNumber(
+        form.chroma_quality,
+        options.chroma_quality,
+      ),
+      chroma_subsample: inputFieldValueAsNumber(
+        form.chroma_subsample,
+        options.chroma_subsample,
+      ),
+      smoothing: inputFieldValueAsNumber(form.smoothing, options.smoothing),
+      color_space: inputFieldValueAsNumber(
+        form.color_space,
+        options.color_space,
+      ),
+      quant_table: inputFieldValueAsNumber(
+        form.quant_table,
+        options.quant_table,
+      ),
+      trellis_loops: inputFieldValueAsNumber(
+        form.trellis_loops,
+        options.trellis_loops,
+      ),
+    };
+    this.props.onChange(newOptions);
+  };
+
+  render({ options }: Props, { showAdvanced }: State) {
+    // I'm rendering both lossy and lossless forms, as it becomes much easier when
+    // gathering the data.
+    return (
+      <form class={style.optionsSection} onSubmit={preventDefault}>
+        <div class={style.optionOneCell}>
+          <Range
+            name="quality"
+            min="0"
+            max="100"
+            value={options.quality}
+            onInput={this.onChange}
+          >
+            Quality:
+          </Range>
+        </div>
+        <label class={style.optionInputFirst}>
+          <Checkbox
+            checked={showAdvanced}
+            onChange={linkState(this, 'showAdvanced')}
+          />
+          Show advanced settings
+        </label>
+        <Expander>
+          {showAdvanced ? (
+            <div>
+              <label class={style.optionTextFirst}>
+                Channels:
+                <Select
+                  name="color_space"
+                  value={options.color_space}
+                  onChange={this.onChange}
+                >
+                  <option value={MozJpegColorSpace.GRAYSCALE}>Grayscale</option>
+                  <option value={MozJpegColorSpace.RGB}>RGB</option>
+                  <option value={MozJpegColorSpace.YCbCr}>YCbCr</option>
+                </Select>
+              </label>
+              <Expander>
+                {options.color_space === MozJpegColorSpace.YCbCr ? (
+                  <div>
+                    <label class={style.optionInputFirst}>
+                      <Checkbox
+                        name="auto_subsample"
+                        checked={options.auto_subsample}
+                        onChange={this.onChange}
+                      />
+                      Auto subsample chroma
+                    </label>
+                    <Expander>
+                      {options.auto_subsample ? null : (
+                        <div class={style.optionOneCell}>
+                          <Range
+                            name="chroma_subsample"
+                            min="1"
+                            max="4"
+                            value={options.chroma_subsample}
+                            onInput={this.onChange}
+                          >
+                            Subsample chroma by:
+                          </Range>
+                        </div>
+                      )}
+                    </Expander>
+                    <label class={style.optionInputFirst}>
+                      <Checkbox
+                        name="separate_chroma_quality"
+                        checked={options.separate_chroma_quality}
+                        onChange={this.onChange}
+                      />
+                      Separate chroma quality
+                    </label>
+                    <Expander>
+                      {options.separate_chroma_quality ? (
+                        <div class={style.optionOneCell}>
+                          <Range
+                            name="chroma_quality"
+                            min="0"
+                            max="100"
+                            value={options.chroma_quality}
+                            onInput={this.onChange}
+                          >
+                            Chroma quality:
+                          </Range>
+                        </div>
+                      ) : null}
+                    </Expander>
+                  </div>
+                ) : null}
+              </Expander>
+              <label class={style.optionInputFirst}>
+                <Checkbox
+                  name="baseline"
+                  checked={options.baseline}
+                  onChange={this.onChange}
+                />
+                Pointless spec compliance
+              </label>
+              <Expander>
+                {options.baseline ? null : (
+                  <label class={style.optionInputFirst}>
+                    <Checkbox
+                      name="progressive"
+                      checked={options.progressive}
+                      onChange={this.onChange}
+                    />
+                    Progressive rendering
+                  </label>
+                )}
+              </Expander>
+              <Expander>
+                {options.baseline ? (
+                  <label class={style.optionInputFirst}>
+                    <Checkbox
+                      name="optimize_coding"
+                      checked={options.optimize_coding}
+                      onChange={this.onChange}
+                    />
+                    Optimize Huffman table
+                  </label>
+                ) : null}
+              </Expander>
+              <div class={style.optionOneCell}>
+                <Range
+                  name="smoothing"
+                  min="0"
+                  max="100"
+                  value={options.smoothing}
+                  onInput={this.onChange}
+                >
+                  Smoothing:
+                </Range>
+              </div>
+              <label class={style.optionTextFirst}>
+                Quantization:
+                <Select
+                  name="quant_table"
+                  value={options.quant_table}
+                  onChange={this.onChange}
+                >
+                  <option value="0">JPEG Annex K</option>
+                  <option value="1">Flat</option>
+                  <option value="2">MSSIM-tuned Kodak</option>
+                  <option value="3">ImageMagick</option>
+                  <option value="4">PSNR-HVS-M-tuned Kodak</option>
+                  <option value="5">Klein et al</option>
+                  <option value="6">Watson et al</option>
+                  <option value="7">Ahumada et al</option>
+                  <option value="8">Peterson et al</option>
+                </Select>
+              </label>
+              <label class={style.optionInputFirst}>
+                <Checkbox
+                  name="trellis_multipass"
+                  checked={options.trellis_multipass}
+                  onChange={this.onChange}
+                />
+                Trellis multipass
+              </label>
+              <Expander>
+                {options.trellis_multipass ? (
+                  <label class={style.optionInputFirst}>
+                    <Checkbox
+                      name="trellis_opt_zero"
+                      checked={options.trellis_opt_zero}
+                      onChange={this.onChange}
+                    />
+                    Optimize zero block runs
+                  </label>
+                ) : null}
+              </Expander>
+              <label class={style.optionInputFirst}>
+                <Checkbox
+                  name="trellis_opt_table"
+                  checked={options.trellis_opt_table}
+                  onChange={this.onChange}
+                />
+                Optimize after trellis quantization
+              </label>
+              <div class={style.optionOneCell}>
+                <Range
+                  name="trellis_loops"
+                  min="1"
+                  max="50"
+                  value={options.trellis_loops}
+                  onInput={this.onChange}
+                >
+                  Trellis quantization passes:
+                </Range>
+              </div>
+            </div>
+          ) : null}
+        </Expander>
+      </form>
+    );
+  }
+}
--- a/src/features/encoders/oxipng/client/index.ts
+++ b/src/features/encoders/oxipng/client/index.ts
@@ -1,18 +0,0 @@
-import {
-  canvasEncode,
-  abortable,
-  blobToArrayBuffer,
-} from 'client/lazy-app/util';
-import { EncodeOptions } from '../shared/meta';
-import type WorkerBridge from 'client/lazy-app/worker-bridge';
-
-export async function encode(
-  signal: AbortSignal,
-  workerBridge: WorkerBridge,
-  imageData: ImageData,
-  options: EncodeOptions,
-) {
-  const pngBlob = await abortable(signal, canvasEncode(imageData, 'image/png'));
-  const pngBuffer = await abortable(signal, blobToArrayBuffer(pngBlob));
-  return workerBridge.oxipngEncode(signal, pngBuffer, options);
-}
--- a/src/features/encoders/oxipng/client/index.tsx
+++ b/src/features/encoders/oxipng/client/index.tsx
@@ -0,0 +1,59 @@
+import {
+  canvasEncode,
+  abortable,
+  blobToArrayBuffer,
+} from 'client/lazy-app/util';
+import { EncodeOptions } from '../shared/meta';
+import type WorkerBridge from 'client/lazy-app/worker-bridge';
+import { h, Component } from 'preact';
+import { inputFieldValueAsNumber, preventDefault } from 'client/lazy-app/util';
+import * as style from 'client/lazy-app/Compress/Options/style.css';
+import Range from 'client/lazy-app/Compress/Options/Range';
+
+export async function encode(
+  signal: AbortSignal,
+  workerBridge: WorkerBridge,
+  imageData: ImageData,
+  options: EncodeOptions,
+) {
+  const pngBlob = await abortable(signal, canvasEncode(imageData, 'image/png'));
+  const pngBuffer = await abortable(signal, blobToArrayBuffer(pngBlob));
+  return workerBridge.oxipngEncode(signal, pngBuffer, options);
+}
+
+type Props = {
+  options: EncodeOptions;
+  onChange(newOptions: EncodeOptions): void;
+};
+
+export class Options extends Component<Props, {}> {
+  onChange = (event: Event) => {
+    const form = (event.currentTarget as HTMLInputElement).closest(
+      'form',
+    ) as HTMLFormElement;
+
+    const options: EncodeOptions = {
+      level: inputFieldValueAsNumber(form.level),
+    };
+    this.props.onChange(options);
+  };
+
+  render({ options }: Props) {
+    return (
+      <form class={style.optionsSection} onSubmit={preventDefault}>
+        <div class={style.optionOneCell}>
+          <Range
+            name="level"
+            min="0"
+            max="3"
+            step="1"
+            value={options.level}
+            onInput={this.onChange}
+          >
+            Effort:
+          </Range>
+        </div>
+      </form>
+    );
+  }
+}
--- a/src/features/encoders/webp/client/index.ts
+++ b/src/features/encoders/webp/client/index.ts
@@ -1,9 +0,0 @@
-import { EncodeOptions } from '../shared/meta';
-import type WorkerBridge from 'client/lazy-app/worker-bridge';
-
-export const encode = (
-  signal: AbortSignal,
-  workerBridge: WorkerBridge,
-  imageData: ImageData,
-  options: EncodeOptions,
-) => workerBridge.webpEncode(signal, imageData, options);
--- a/src/features/encoders/webp/client/index.tsx
+++ b/src/features/encoders/webp/client/index.tsx
@@ -0,0 +1,407 @@
+import { EncodeOptions } from '../shared/meta';
+import type WorkerBridge from 'client/lazy-app/worker-bridge';
+import { h, Component } from 'preact';
+import {
+  inputFieldCheckedAsNumber,
+  inputFieldValueAsNumber,
+  preventDefault,
+} from 'client/lazy-app/util';
+import * as style from 'client/lazy-app/Compress/Options/style.css';
+import linkState from 'linkstate';
+import Range from 'client/lazy-app/Compress/Options/Range';
+import Checkbox from 'client/lazy-app/Compress/Options/Checkbox';
+import Expander from 'client/lazy-app/Compress/Options/Expander';
+import Select from 'client/lazy-app/Compress/Options/Select';
+
+export const encode = (
+  signal: AbortSignal,
+  workerBridge: WorkerBridge,
+  imageData: ImageData,
+  options: EncodeOptions,
+) => workerBridge.webpEncode(signal, imageData, options);
+
+const enum WebPImageHint {
+  WEBP_HINT_DEFAULT, // default preset.
+  WEBP_HINT_PICTURE, // digital picture, like portrait, inner shot
+  WEBP_HINT_PHOTO, // outdoor photograph, with natural lighting
+  WEBP_HINT_GRAPH, // Discrete tone image (graph, map-tile etc).
+}
+
+interface Props {
+  options: EncodeOptions;
+  onChange(newOptions: EncodeOptions): void;
+}
+
+interface State {
+  showAdvanced: boolean;
+}
+
+// From kLosslessPresets in config_enc.c
+// The format is [method, quality].
+const losslessPresets: [number, number][] = [
+  [0, 0],
+  [1, 20],
+  [2, 25],
+  [3, 30],
+  [3, 50],
+  [4, 50],
+  [4, 75],
+  [4, 90],
+  [5, 90],
+  [6, 100],
+];
+const losslessPresetDefault = 6;
+
+function determineLosslessQuality(quality: number, method: number): number {
+  const index = losslessPresets.findIndex(
+    ([presetMethod, presetQuality]) =>
+      presetMethod === method && presetQuality === quality,
+  );
+  if (index !== -1) return index;
+  // Quality doesn't match one of the presets.
+  // This can happen when toggling 'lossless'.
+  return losslessPresetDefault;
+}
+
+export class Options extends Component<Props, State> {
+  state: State = {
+    showAdvanced: false,
+  };
+
+  onChange = (event: Event) => {
+    const form = (event.currentTarget as HTMLInputElement).closest(
+      'form',
+    ) as HTMLFormElement;
+    const lossless = inputFieldCheckedAsNumber(form.lossless);
+    const { options } = this.props;
+    const losslessPresetValue = inputFieldValueAsNumber(
+      form.lossless_preset,
+      determineLosslessQuality(options.quality, options.method),
+    );
+
+    const newOptions: EncodeOptions = {
+      // Copy over options the form doesn't care about, eg emulate_jpeg_size
+      ...options,
+      // And now stuff from the form:
+      lossless,
+      // Special-cased inputs:
+      // In lossless mode, the quality is derived from the preset.
+      quality: lossless
+        ? losslessPresets[losslessPresetValue][1]
+        : inputFieldValueAsNumber(form.quality, options.quality),
+      // In lossless mode, the method is derived from the preset.
+      method: lossless
+        ? losslessPresets[losslessPresetValue][0]
+        : inputFieldValueAsNumber(form.method_input, options.method),
+      image_hint: inputFieldCheckedAsNumber(form.image_hint, options.image_hint)
+        ? WebPImageHint.WEBP_HINT_GRAPH
+        : WebPImageHint.WEBP_HINT_DEFAULT,
+      // .checked
+      exact: inputFieldCheckedAsNumber(form.exact, options.exact),
+      alpha_compression: inputFieldCheckedAsNumber(
+        form.alpha_compression,
+        options.alpha_compression,
+      ),
+      autofilter: inputFieldCheckedAsNumber(
+        form.autofilter,
+        options.autofilter,
+      ),
+      filter_type: inputFieldCheckedAsNumber(
+        form.filter_type,
+        options.filter_type,
+      ),
+      use_sharp_yuv: inputFieldCheckedAsNumber(
+        form.use_sharp_yuv,
+        options.use_sharp_yuv,
+      ),
+      // .value
+      near_lossless:
+        100 -
+        inputFieldValueAsNumber(
+          form.near_lossless,
+          100 - options.near_lossless,
+        ),
+      alpha_quality: inputFieldValueAsNumber(
+        form.alpha_quality,
+        options.alpha_quality,
+      ),
+      alpha_filtering: inputFieldValueAsNumber(
+        form.alpha_filtering,
+        options.alpha_filtering,
+      ),
+      sns_strength: inputFieldValueAsNumber(
+        form.sns_strength,
+        options.sns_strength,
+      ),
+      filter_strength: inputFieldValueAsNumber(
+        form.filter_strength,
+        options.filter_strength,
+      ),
+      filter_sharpness:
+        7 -
+        inputFieldValueAsNumber(
+          form.filter_sharpness,
+          7 - options.filter_sharpness,
+        ),
+      pass: inputFieldValueAsNumber(form.pass, options.pass),
+      preprocessing: inputFieldValueAsNumber(
+        form.preprocessing,
+        options.preprocessing,
+      ),
+      segments: inputFieldValueAsNumber(form.segments, options.segments),
+      partitions: inputFieldValueAsNumber(form.partitions, options.partitions),
+    };
+    this.props.onChange(newOptions);
+  };
+
+  private _losslessSpecificOptions(options: EncodeOptions) {
+    return (
+      <div key="lossless">
+        <div class={style.optionOneCell}>
+          <Range
+            name="lossless_preset"
+            min="0"
+            max="9"
+            value={determineLosslessQuality(options.quality, options.method)}
+            onInput={this.onChange}
+          >
+            Effort:
+          </Range>
+        </div>
+        <div class={style.optionOneCell}>
+          <Range
+            name="near_lossless"
+            min="0"
+            max="100"
+            value={'' + (100 - options.near_lossless)}
+            onInput={this.onChange}
+          >
+            Slight loss:
+          </Range>
+        </div>
+        <label class={style.optionInputFirst}>
+          {/*
+            Although there are 3 different kinds of image hint, webp only
+            seems to do something with the 'graph' type, and I don't really
+            understand what it does.
+          */}
+          <Checkbox
+            name="image_hint"
+            checked={options.image_hint === WebPImageHint.WEBP_HINT_GRAPH}
+            onChange={this.onChange}
+          />
+          Discrete tone image
+        </label>
+      </div>
+    );
+  }
+
+  private _lossySpecificOptions(options: EncodeOptions) {
+    const { showAdvanced } = this.state;
+
+    return (
+      <div key="lossy">
+        <div class={style.optionOneCell}>
+          <Range
+            name="method_input"
+            min="0"
+            max="6"
+            value={options.method}
+            onInput={this.onChange}
+          >
+            Effort:
+          </Range>
+        </div>
+        <div class={style.optionOneCell}>
+          <Range
+            name="quality"
+            min="0"
+            max="100"
+            step="0.1"
+            value={options.quality}
+            onInput={this.onChange}
+          >
+            Quality:
+          </Range>
+        </div>
+        <label class={style.optionInputFirst}>
+          <Checkbox
+            checked={showAdvanced}
+            onChange={linkState(this, 'showAdvanced')}
+          />
+          Show advanced settings
+        </label>
+        <Expander>
+          {showAdvanced ? (
+            <div>
+              <label class={style.optionInputFirst}>
+                <Checkbox
+                  name="alpha_compression"
+                  checked={!!options.alpha_compression}
+                  onChange={this.onChange}
+                />
+                Compress alpha
+              </label>
+              <div class={style.optionOneCell}>
+                <Range
+                  name="alpha_quality"
+                  min="0"
+                  max="100"
+                  value={options.alpha_quality}
+                  onInput={this.onChange}
+                >
+                  Alpha quality:
+                </Range>
+              </div>
+              <div class={style.optionOneCell}>
+                <Range
+                  name="alpha_filtering"
+                  min="0"
+                  max="2"
+                  value={options.alpha_filtering}
+                  onInput={this.onChange}
+                >
+                  Alpha filter quality:
+                </Range>
+              </div>
+              <label class={style.optionInputFirst}>
+                <Checkbox
+                  name="autofilter"
+                  checked={!!options.autofilter}
+                  onChange={this.onChange}
+                />
+                Auto adjust filter strength
+              </label>
+              <Expander>
+                {options.autofilter ? null : (
+                  <div class={style.optionOneCell}>
+                    <Range
+                      name="filter_strength"
+                      min="0"
+                      max="100"
+                      value={options.filter_strength}
+                      onInput={this.onChange}
+                    >
+                      Filter strength:
+                    </Range>
+                  </div>
+                )}
+              </Expander>
+              <label class={style.optionInputFirst}>
+                <Checkbox
+                  name="filter_type"
+                  checked={!!options.filter_type}
+                  onChange={this.onChange}
+                />
+                Strong filter
+              </label>
+              <div class={style.optionOneCell}>
+                <Range
+                  name="filter_sharpness"
+                  min="0"
+                  max="7"
+                  value={7 - options.filter_sharpness}
+                  onInput={this.onChange}
+                >
+                  Filter sharpness:
+                </Range>
+              </div>
+              <label class={style.optionInputFirst}>
+                <Checkbox
+                  name="use_sharp_yuv"
+                  checked={!!options.use_sharp_yuv}
+                  onChange={this.onChange}
+                />
+                Sharp RGB→YUV conversion
+              </label>
+              <div class={style.optionOneCell}>
+                <Range
+                  name="pass"
+                  min="1"
+                  max="10"
+                  value={options.pass}
+                  onInput={this.onChange}
+                >
+                  Passes:
+                </Range>
+              </div>
+              <div class={style.optionOneCell}>
+                <Range
+                  name="sns_strength"
+                  min="0"
+                  max="100"
+                  value={options.sns_strength}
+                  onInput={this.onChange}
+                >
+                  Spatial noise shaping:
+                </Range>
+              </div>
+              <label class={style.optionTextFirst}>
+                Preprocess:
+                <Select
+                  name="preprocessing"
+                  value={options.preprocessing}
+                  onChange={this.onChange}
+                >
+                  <option value="0">None</option>
+                  <option value="1">Segment smooth</option>
+                  <option value="2">Pseudo-random dithering</option>
+                </Select>
+              </label>
+              <div class={style.optionOneCell}>
+                <Range
+                  name="segments"
+                  min="1"
+                  max="4"
+                  value={options.segments}
+                  onInput={this.onChange}
+                >
+                  Segments:
+                </Range>
+              </div>
+              <div class={style.optionOneCell}>
+                <Range
+                  name="partitions"
+                  min="0"
+                  max="3"
+                  value={options.partitions}
+                  onInput={this.onChange}
+                >
+                  Partitions:
+                </Range>
+              </div>
+            </div>
+          ) : null}
+        </Expander>
+      </div>
+    );
+  }
+
+  render({ options }: Props) {
+    // I'm rendering both lossy and lossless forms, as it becomes much easier when
+    // gathering the data.
+    return (
+      <form class={style.optionsSection} onSubmit={preventDefault}>
+        <label class={style.optionInputFirst}>
+          <Checkbox
+            name="lossless"
+            checked={!!options.lossless}
+            onChange={this.onChange}
+          />
+          Lossless
+        </label>
+        {options.lossless
+          ? this._losslessSpecificOptions(options)
+          : this._lossySpecificOptions(options)}
+        <label class={style.optionInputFirst}>
+          <Checkbox
+            name="exact"
+            checked={!!options.exact}
+            onChange={this.onChange}
+          />
+          Preserve transparent data
+        </label>
+      </form>
+    );
+  }
+}
--- a/src/features/processors/quantize/client/index.tsx
+++ b/src/features/processors/quantize/client/index.tsx
@@ -0,0 +1,98 @@
+import { h, Component } from 'preact';
+import { Options as QuantizeOptions } from '../shared/meta';
+import * as style from 'client/lazy-app/Compress/Options/style.css';
+import {
+  inputFieldValueAsNumber,
+  konami,
+  preventDefault,
+} from 'client/lazy-app/util';
+import Expander from 'client/lazy-app/Compress/Options/Expander';
+import Select from 'client/lazy-app/Compress/Options/Select';
+import Range from 'client/lazy-app/Compress/Options/Range';
+
+const konamiPromise = konami();
+
+interface Props {
+  options: QuantizeOptions;
+  onChange(newOptions: QuantizeOptions): void;
+}
+
+interface State {
+  extendedSettings: boolean;
+}
+
+export class Options extends Component<Props, State> {
+  state: State = { extendedSettings: false };
+
+  componentDidMount() {
+    konamiPromise.then(() => {
+      this.setState({ extendedSettings: true });
+    });
+  }
+
+  onChange = (event: Event) => {
+    const form = (event.currentTarget as HTMLInputElement).closest(
+      'form',
+    ) as HTMLFormElement;
+    const { options } = this.props;
+
+    const newOptions: QuantizeOptions = {
+      zx: inputFieldValueAsNumber(form.zx, options.zx),
+      maxNumColors: inputFieldValueAsNumber(
+        form.maxNumColors,
+        options.maxNumColors,
+      ),
+      dither: inputFieldValueAsNumber(form.dither),
+    };
+    this.props.onChange(newOptions);
+  };
+
+  render({ options }: Props, { extendedSettings }: State) {
+    return (
+      <form class={style.optionsSection} onSubmit={preventDefault}>
+        <Expander>
+          {extendedSettings ? (
+            <label class={style.optionTextFirst}>
+              Type:
+              <Select
+                name="zx"
+                value={'' + options.zx}
+                onChange={this.onChange}
+              >
+                <option value="0">Standard</option>
+                <option value="1">ZX</option>
+              </Select>
+            </label>
+          ) : null}
+        </Expander>
+        <Expander>
+          {options.zx ? null : (
+            <div class={style.optionOneCell}>
+              <Range
+                name="maxNumColors"
+                min="2"
+                max="256"
+                value={options.maxNumColors}
+                onInput={this.onChange}
+              >
+                Colors:
+              </Range>
+            </div>
+          )}
+        </Expander>
+        <div class={style.optionOneCell}>
+          <Range
+            name="dither"
+            min="0"
+            max="1"
+            step="0.01"
+            value={options.dither}
+            onInput={this.onChange}
+          >
+            Dithering:
+          </Range>
+        </div>
+      </form>
+    );
+  }
+}
--- a/src/features/processors/resize/client/index.ts
+++ b/src/features/processors/resize/client/index.ts
@@ -1,85 +0,0 @@
-import {
-  builtinResize,
-  BuiltinResizeMethod,
-  drawableToImageData,
-} from 'client/lazy-app/util';
-import {
-  BrowserResizeOptions,
-  VectorResizeOptions,
-  WorkerResizeOptions,
-  Options,
-  workerResizeMethods,
-} from '../shared/meta';
-import { getContainOffsets } from '../shared/util';
-import type { SourceImage } from 'client/lazy-app/Compress';
-import type WorkerBridge from 'client/lazy-app/worker-bridge';
-
-/**
- * Return whether a set of options are worker resize options.
- *
- * @param opts
- */
-function isWorkerOptions(opts: Options): opts is WorkerResizeOptions {
-  return (workerResizeMethods as string[]).includes(opts.method);
-}
-
-function browserResize(data: ImageData, opts: BrowserResizeOptions): ImageData {
-  let sx = 0;
-  let sy = 0;
-  let sw = data.width;
-  let sh = data.height;
-
-  if (opts.fitMethod === 'contain') {
-    ({ sx, sy, sw, sh } = getContainOffsets(sw, sh, opts.width, opts.height));
-  }
-
-  return builtinResize(
-    data,
-    sx,
-    sy,
-    sw,
-    sh,
-    opts.width,
-    opts.height,
-    opts.method.slice('browser-'.length) as BuiltinResizeMethod,
-  );
-}
-
-function vectorResize(
-  data: HTMLImageElement,
-  opts: VectorResizeOptions,
-): ImageData {
-  let sx = 0;
-  let sy = 0;
-  let sw = data.width;
-  let sh = data.height;
-
-  if (opts.fitMethod === 'contain') {
-    ({ sx, sy, sw, sh } = getContainOffsets(sw, sh, opts.width, opts.height));
-  }
-
-  return drawableToImageData(data, {
-    sx,
-    sy,
-    sw,
-    sh,
-    width: opts.width,
-    height: opts.height,
-  });
-}
-
-export async function resize(
-  signal: AbortSignal,
-  source: SourceImage,
-  options: Options,
-  workerBridge: WorkerBridge,
-) {
-  if (options.method === 'vector') {
-    if (!source.vectorImage) throw Error('No vector image available');
-    return vectorResize(source.vectorImage, options);
-  }
-  if (isWorkerOptions(options)) {
-    return workerBridge.resize(signal, source.preprocessed, options);
-  }
-  return browserResize(source.preprocessed, options);
-}
--- a/src/features/processors/resize/client/index.tsx
+++ b/src/features/processors/resize/client/index.tsx
@@ -0,0 +1,334 @@
+import {
+  builtinResize,
+  BuiltinResizeMethod,
+  drawableToImageData,
+} from 'client/lazy-app/util';
+import {
+  BrowserResizeOptions,
+  VectorResizeOptions,
+  WorkerResizeOptions,
+  Options as ResizeOptions,
+  workerResizeMethods,
+} from '../shared/meta';
+import { getContainOffsets } from '../shared/util';
+import type { SourceImage } from 'client/lazy-app/Compress';
+import type WorkerBridge from 'client/lazy-app/worker-bridge';
+import { h, Component } from 'preact';
+import linkState from 'linkstate';
+import {
+  inputFieldValueAsNumber,
+  inputFieldValue,
+  preventDefault,
+  inputFieldChecked,
+} from 'client/lazy-app/util';
+import * as style from 'client/lazy-app/Compress/Options/style.css';
+import { linkRef } from 'shared/initial-app/util';
+import Select from 'client/lazy-app/Compress/Options/Select';
+import Expander from 'client/lazy-app/Compress/Options/Expander';
+import Checkbox from 'client/lazy-app/Compress/Options/Checkbox';
+
+/**
+ * Return whether a set of options are worker resize options.
+ *
+ * @param opts
+ */
+function isWorkerOptions(opts: ResizeOptions): opts is WorkerResizeOptions {
+  return (workerResizeMethods as string[]).includes(opts.method);
+}
+
+function browserResize(data: ImageData, opts: BrowserResizeOptions): ImageData {
+  let sx = 0;
+  let sy = 0;
+  let sw = data.width;
+  let sh = data.height;
+
+  if (opts.fitMethod === 'contain') {
+    ({ sx, sy, sw, sh } = getContainOffsets(sw, sh, opts.width, opts.height));
+  }
+
+  return builtinResize(
+    data,
+    sx,
+    sy,
+    sw,
+    sh,
+    opts.width,
+    opts.height,
+    opts.method.slice('browser-'.length) as BuiltinResizeMethod,
+  );
+}
+
+function vectorResize(
+  data: HTMLImageElement,
+  opts: VectorResizeOptions,
+): ImageData {
+  let sx = 0;
+  let sy = 0;
+  let sw = data.width;
+  let sh = data.height;
+
+  if (opts.fitMethod === 'contain') {
+    ({ sx, sy, sw, sh } = getContainOffsets(sw, sh, opts.width, opts.height));
+  }
+
+  return drawableToImageData(data, {
+    sx,
+    sy,
+    sw,
+    sh,
+    width: opts.width,
+    height: opts.height,
+  });
+}
+
+export async function resize(
+  signal: AbortSignal,
+  source: SourceImage,
+  options: ResizeOptions,
+  workerBridge: WorkerBridge,
+) {
+  if (options.method === 'vector') {
+    if (!source.vectorImage) throw Error('No vector image available');
+    return vectorResize(source.vectorImage, options);
+  }
+  if (isWorkerOptions(options)) {
+    return workerBridge.resize(signal, source.preprocessed, options);
+  }
+  return browserResize(source.preprocessed, options);
+}
+
+interface Props {
+  isVector: Boolean;
+  inputWidth: number;
+  inputHeight: number;
+  options: ResizeOptions;
+  onChange(newOptions: ResizeOptions): void;
+}
+
+interface State {
+  maintainAspect: boolean;
+}
+
+const sizePresets = [0.25, 0.3333, 0.5, 1, 2, 3, 4];
+
+export class Options extends Component<Props, State> {
+  state: State = {
+    maintainAspect: true,
+  };
+
+  private form?: HTMLFormElement;
+  private presetWidths: { [idx: number]: number } = {};
+  private presetHeights: { [idx: number]: number } = {};
+
+  constructor(props: Props) {
+    super(props);
+    this.generatePresetValues(props.inputWidth, props.inputHeight);
+  }
+
+  private reportOptions() {
+    const form = this.form!;
+    const width = form.width as HTMLInputElement;
+    const height = form.height as HTMLInputElement;
+    const { options } = this.props;
+
+    if (!width.checkValidity() || !height.checkValidity()) return;
+
+    const newOptions: ResizeOptions = {
+      width: inputFieldValueAsNumber(width),
+      height: inputFieldValueAsNumber(height),
+      method: form.resizeMethod.value,
+      premultiply: inputFieldChecked(form.premultiply, true),
+      linearRGB: inputFieldChecked(form.linearRGB, true),
+      // Casting, as the formfield only returns the correct values.
+      fitMethod: inputFieldValue(
+        form.fitMethod,
+        options.fitMethod,
+      ) as ResizeOptions['fitMethod'],
+    };
+    this.props.onChange(newOptions);
+  }
+
+  private onChange = () => {
+    this.reportOptions();
+  };
+
+  private getAspect() {
+    return this.props.inputWidth / this.props.inputHeight;
+  }
+
+  componentDidUpdate(prevProps: Props, prevState: State) {
+    if (!prevState.maintainAspect && this.state.maintainAspect) {
+      this.form!.height.value = Math.round(
+        Number(this.form!.width.value) / this.getAspect(),
+      );
+      this.reportOptions();
+    }
+  }
+
+  componentWillReceiveProps(nextProps: Props) {
+    if (
+      this.props.inputWidth !== nextProps.inputWidth ||
+      this.props.inputHeight !== nextProps.inputHeight
+    ) {
+      this.generatePresetValues(nextProps.inputWidth, nextProps.inputHeight);
+    }
+  }
+
+  private onWidthInput = () => {
+    if (this.state.maintainAspect) {
+      const width = inputFieldValueAsNumber(this.form!.width);
+      this.form!.height.value = Math.round(width / this.getAspect());
+    }
+
+    this.reportOptions();
+  };
+
+  private onHeightInput = () => {
+    if (this.state.maintainAspect) {
+      const height = inputFieldValueAsNumber(this.form!.height);
+      this.form!.width.value = Math.round(height * this.getAspect());
+    }
+
+    this.reportOptions();
+  };
+
+  private generatePresetValues(width: number, height: number) {
+    for (const preset of sizePresets) {
+      this.presetWidths[preset] = Math.round(width * preset);
+      this.presetHeights[preset] = Math.round(height * preset);
+    }
+  }
+
+  private getPreset(): number | string {
+    const { width, height } = this.props.options;
+
+    for (const preset of sizePresets) {
+      if (
+        width === this.presetWidths[preset] &&
+        height === this.presetHeights[preset]
+      )
+        return preset;
+    }
+
+    return 'custom';
+  }
+
+  private onPresetChange = (event: Event) => {
+    const select = event.target as HTMLSelectElement;
+    if (select.value === 'custom') return;
+    const multiplier = Number(select.value);
+    (this.form!.width as HTMLInputElement).value =
+      Math.round(this.props.inputWidth * multiplier) + '';
+    (this.form!.height as HTMLInputElement).value =
+      Math.round(this.props.inputHeight * multiplier) + '';
+    this.reportOptions();
+  };
+
+  render({ options, isVector }: Props, { maintainAspect }: State) {
+    return (
+      <form
+        ref={linkRef(this, 'form')}
+        class={style.optionsSection}
+        onSubmit={preventDefault}
+      >
+        <label class={style.optionTextFirst}>
+          Method:
+          <Select
+            name="resizeMethod"
+            value={options.method}
+            onChange={this.onChange}
+          >
+            {isVector && <option value="vector">Vector</option>}
+            <option value="lanczos3">Lanczos3</option>
+            <option value="mitchell">Mitchell</option>
+            <option value="catrom">Catmull-Rom</option>
+            <option value="triangle">Triangle (bilinear)</option>
+            <option value="hqx">hqx (pixel art)</option>
+            <option value="browser-pixelated">Browser pixelated</option>
+            <option value="browser-low">Browser low quality</option>
+            <option value="browser-medium">Browser medium quality</option>
+            <option value="browser-high">Browser high quality</option>
+          </Select>
+        </label>
+        <label class={style.optionTextFirst}>
+          Preset:
+          <Select value={this.getPreset()} onChange={this.onPresetChange}>
+            {sizePresets.map((preset) => (
+              <option value={preset}>{preset * 100}%</option>
+            ))}
+            <option value="custom">Custom</option>
+          </Select>
+        </label>
+        <label class={style.optionTextFirst}>
+          Width:
+          <input
+            required
+            class={style.textField}
+            name="width"
+            type="number"
+            min="1"
+            value={'' + options.width}
+            onInput={this.onWidthInput}
+          />
+        </label>
+        <label class={style.optionTextFirst}>
+          Height:
+          <input
+            required
+            class={style.textField}
+            name="height"
+            type="number"
+            min="1"
+            value={'' + options.height}
+            onInput={this.onHeightInput}
+          />
+        </label>
+        <Expander>
+          {isWorkerOptions(options) ? (
+            <label class={style.optionInputFirst}>
+              <Checkbox
+                name="premultiply"
+                checked={options.premultiply}
+                onChange={this.onChange}
+              />
+              Premultiply alpha channel
+            </label>
+          ) : null}
+          {isWorkerOptions(options) ? (
+            <label class={style.optionInputFirst}>
+              <Checkbox
+                name="linearRGB"
+                checked={options.linearRGB}
+                onChange={this.onChange}
+              />
+              Linear RGB
+            </label>
+          ) : null}
+        </Expander>
+        <label class={style.optionInputFirst}>
+          <Checkbox
+            name="maintainAspect"
+            checked={maintainAspect}
+            onChange={linkState(this, 'maintainAspect')}
+          />
+          Maintain aspect ratio
+        </label>
+        <Expander>
+          {maintainAspect ? null : (
+            <label class={style.optionTextFirst}>
+              Fit method:
+              <Select
+                name="fitMethod"
+                value={options.fitMethod}
+                onChange={this.onChange}
+              >
+                <option value="stretch">Stretch</option>
+                <option value="contain">Contain</option>
+              </Select>
+            </label>
+          )}
+        </Expander>
+      </form>
+    );
+  }
+}