634 lines
21 KiB
TypeScript
634 lines
21 KiB
TypeScript
/**
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* Copyright (c) 2025 The xterm.js authors. All rights reserved.
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* @license MIT
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*/
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import { IApcHandler, IImageAddonOptions, IResetHandler, ITerminalExt } from '../Types';
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import { ImageRenderer } from '../ImageRenderer';
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import { ImageStorage, CELL_SIZE_DEFAULT } from '../ImageStorage';
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import Base64Decoder, { type DecodeStatus } from 'xterm-wasm-parts/lib/base64/Base64Decoder.wasm';
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import {
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KittyAction,
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KittyFormat,
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KittyCompression,
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IKittyCommand,
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IPendingTransmission,
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IKittyImageData,
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BYTES_PER_PIXEL_RGB,
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BYTES_PER_PIXEL_RGBA,
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ALPHA_OPAQUE,
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parseKittyCommand
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} from './KittyGraphicsTypes';
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// Memory limit for base64 decoder (4MB, same as IIPHandler)
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const DECODER_KEEP_DATA = 4194304;
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const DECODER_INITIAL_DATA = 4194304; // 4MB
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// Local mirror of const enum (esbuild can't inline const enums from external packages)
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const DECODER_OK: DecodeStatus.OK = 0;
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// Maximum control data size
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const MAX_CONTROL_DATA_SIZE = 512;
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// Semicolon codepoint
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const SEMICOLON = 0x3B;
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/**
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* Kitty graphics protocol handler with streaming base64 decoding.
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*/
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export class KittyGraphicsHandler implements IApcHandler, IResetHandler {
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private _aborted = false;
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private _decodeError = false;
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private _activeDecoder: Base64Decoder | null = null;
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private readonly _maxEncodedBytes: number;
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private readonly _initialEncodedBytes: number;
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// Streaming related states
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/** True while receiving control data (before semicolon). */
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private _inControlData = true;
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/** Buffer for control data. */
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private _controlData = new Uint32Array(MAX_CONTROL_DATA_SIZE);
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private _controlLength = 0;
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/** Pre-calculated encoded size limit */
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private _encodedSizeLimit = 0;
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private _totalEncodedSize = 0;
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/** Parsed command. These are the control data before semicolon. */
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private _parsedCommand: IKittyCommand | null = null;
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// Storage related states
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private _pendingTransmissions: Map<number, IPendingTransmission> = new Map();
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private _nextImageId = 1;
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/** Maps Kitty protocol image ID → ImageStorage internal ID for deletion/lookup. */
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private _kittyIdToStorageId: Map<number, number> = new Map();
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// TODO: Eliminate double storage — raw image data lives here (as Blob) AND rendered
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// ImageBitmaps live in ImageStorage. Currently we only use ImageStorage.addImage(bitmap)
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// for tiling + cursor movement + marker-based eviction.
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//
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// See: https://github.com/xtermjs/xterm.js/pull/5619#issuecomment-3853678815
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private _images: Map<number, IKittyImageData> = new Map();
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constructor(
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private readonly _opts: IImageAddonOptions,
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private readonly _renderer: ImageRenderer,
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private readonly _storage: ImageStorage,
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private readonly _coreTerminal: ITerminalExt
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) {
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// Convert decoded size limit -> max encoded bytes.
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this._maxEncodedBytes = Math.ceil(this._opts.kittySizeLimit * 4 / 3);
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// ensure we preallocate more than configured limit while using 4mb initial size.
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this._initialEncodedBytes = Math.min(DECODER_INITIAL_DATA, this._maxEncodedBytes);
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}
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public reset(): void {
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for (const pending of this._pendingTransmissions.values()) {
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pending.decoder.release();
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}
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this._pendingTransmissions.clear();
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if (this._activeDecoder) {
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this._activeDecoder.release();
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this._activeDecoder = null;
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}
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this._images.clear();
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this._kittyIdToStorageId.clear();
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}
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public start(): void {
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this._aborted = false;
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this._decodeError = false;
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this._inControlData = true;
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this._controlLength = 0;
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this._parsedCommand = null;
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// Pre-calculate encoded limit once: base64 is 4 bytes encoded → 3 bytes decoded
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this._encodedSizeLimit = this._maxEncodedBytes;
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this._totalEncodedSize = 0;
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this._activeDecoder = null;
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}
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public put(data: Uint32Array, start: number, end: number): void {
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if (this._aborted) return;
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if (!this._inControlData) {
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this._streamPayload(data, start, end);
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} else {
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// Scan for semicolon
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let controlEnd = end;
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for (let i = start; i < end; i++) {
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if (data[i] === SEMICOLON) {
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this._inControlData = false;
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controlEnd = i;
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break;
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}
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}
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// Copy control data
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const copyLength = controlEnd - start;
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if (this._controlLength + copyLength > MAX_CONTROL_DATA_SIZE) {
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this._aborted = true;
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return;
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}
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this._controlData.set(data.subarray(start, controlEnd), this._controlLength);
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this._controlLength += copyLength;
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if (!this._inControlData) {
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// Found semicolon - parse control data early for validation
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this._parsedCommand = parseKittyCommand(this._parseControlDataString());
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// Early validation: i+I conflict
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if (this._parsedCommand.id !== undefined && this._parsedCommand.imageNumber !== undefined) {
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this._sendResponse(this._parsedCommand.id, 'EINVAL:cannot specify both i and I keys', this._parsedCommand.quiet ?? 0);
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this._aborted = true;
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return;
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}
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// Delete action doesn't need payload - skip streaming
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if (this._parsedCommand.action === KittyAction.DELETE) {
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return;
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}
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// Stream remaining as payload
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const payloadStart = controlEnd + 1;
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if (payloadStart < end) {
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this._streamPayload(data, payloadStart, end);
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}
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}
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}
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}
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/**
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* Stream payload bytes into the base64 decoder.
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*/
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private _streamPayload(data: Uint32Array, start: number, end: number): void {
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if (this._aborted) return;
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// Check size limit (compare encoded bytes against pre-calculated limit)
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// Include cumulative size from pending transmission for multi-chunk images
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const pendingKey = this._parsedCommand?.id ?? 0;
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const pending = this._pendingTransmissions.get(pendingKey);
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const previousEncodedSize = pending?.totalEncodedSize ?? 0;
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this._totalEncodedSize += end - start;
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const cumulativeEncodedSize = previousEncodedSize + this._totalEncodedSize;
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if (cumulativeEncodedSize > this._encodedSizeLimit) {
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const decoderToRelease = this._activeDecoder ?? pending?.decoder;
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if (decoderToRelease) {
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decoderToRelease.release();
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}
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this._activeDecoder = null;
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if (pending) {
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this._pendingTransmissions.delete(pendingKey);
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}
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this._aborted = true;
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return;
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}
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if (this._decodeError) return;
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if (pending?.decoder && !this._activeDecoder) {
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this._activeDecoder = pending.decoder;
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}
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if (!this._activeDecoder) {
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this._activeDecoder = new Base64Decoder(DECODER_KEEP_DATA, this._maxEncodedBytes, this._initialEncodedBytes);
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this._activeDecoder.init();
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}
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if (this._activeDecoder.put(data.subarray(start, end)) !== DECODER_OK) {
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this._activeDecoder.release();
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this._activeDecoder = null;
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this._decodeError = true;
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if (pending) {
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this._pendingTransmissions.delete(pendingKey);
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}
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}
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}
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public end(success: boolean): boolean | Promise<boolean> {
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if (this._aborted || !success) {
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if (this._activeDecoder) {
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this._activeDecoder.release();
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this._activeDecoder = null;
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}
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return true;
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}
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// No semicolon = no payload (delete, capability query)
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if (this._inControlData) {
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return this._handleNoPayloadCommand();
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}
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// Use command parsed early in put() - i+I already validated there
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const cmd = this._parsedCommand!;
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// Delete action was handled by skipping payload - just execute
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if (cmd.action === KittyAction.DELETE) {
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return this._handleDelete(cmd);
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}
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const pendingKey = cmd.id ?? 0;
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const isMoreComing = cmd.more === 1;
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const pending = this._pendingTransmissions.get(pendingKey);
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if (isMoreComing) {
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if (this._activeDecoder) {
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if (pending) {
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pending.totalEncodedSize += this._totalEncodedSize;
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pending.decodeError = pending.decodeError || this._decodeError;
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} else {
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this._pendingTransmissions.set(pendingKey, {
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cmd: { ...cmd },
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decoder: this._activeDecoder,
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totalEncodedSize: this._totalEncodedSize,
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decodeError: this._decodeError
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});
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}
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this._activeDecoder = null;
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}
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return true;
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}
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let decodeError = this._decodeError;
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let finalCmd = cmd;
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let decoder = this._activeDecoder;
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if (pending) {
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finalCmd = pending.cmd;
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decoder = pending.decoder;
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decodeError = decodeError || pending.decodeError;
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this._pendingTransmissions.delete(pendingKey);
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}
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let imageBytes = new Uint8Array(0);
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if (decoder) {
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if (decoder.end() !== DECODER_OK) {
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decodeError = true;
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}
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imageBytes = decoder.data8;
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}
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this._activeDecoder = null;
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// Handle command first — handlers create Blob/ImageData from imageBytes,
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// which copies the data. Only then is it safe to release the decoder's
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// wasm memory that imageBytes points into.
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const result = this._handleCommandWithBytesAndCmd(finalCmd, imageBytes, decodeError);
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if (decoder) {
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decoder.release();
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}
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return result;
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}
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// Command handling
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private _parseControlDataString(): string {
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let str = '';
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for (let i = 0; i < this._controlLength; i++) {
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str += String.fromCodePoint(this._controlData[i]);
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}
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return str;
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}
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private _handleNoPayloadCommand(): boolean | Promise<boolean> {
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const cmd = parseKittyCommand(this._parseControlDataString());
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// Per spec: specifying both i and I is an error
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if (cmd.id !== undefined && cmd.imageNumber !== undefined) {
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this._sendResponse(cmd.id, 'EINVAL:cannot specify both i and I keys', cmd.quiet ?? 0);
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return true;
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}
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const action = cmd.action ?? 't';
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switch (action) {
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case KittyAction.DELETE:
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return this._handleDelete(cmd);
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case KittyAction.QUERY:
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this._sendResponse(cmd.id ?? 0, 'OK', cmd.quiet ?? 0);
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return true;
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default:
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return true;
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}
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}
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private _handleCommandWithBytesAndCmd(cmd: IKittyCommand, bytes: Uint8Array, decodeError: boolean): boolean | Promise<boolean> {
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const action = cmd.action ?? 't';
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switch (action) {
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case KittyAction.TRANSMIT: {
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const result = this._handleTransmit(cmd, bytes, decodeError);
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if (cmd.id !== undefined && !decodeError && bytes.length > 0) {
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this._sendResponse(cmd.id, 'OK', cmd.quiet ?? 0);
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}
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return result;
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}
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case KittyAction.TRANSMIT_DISPLAY:
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return this._handleTransmitDisplay(cmd, bytes, decodeError);
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case KittyAction.QUERY:
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return this._handleQuery(cmd, bytes, decodeError);
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default:
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return true;
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}
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}
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private _handleTransmit(cmd: IKittyCommand, bytes: Uint8Array, decodeError: boolean): boolean {
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// TODO: Support file-based transmission modes (t=f, t=t, t=s)
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// Currently only supports direct transmission (t=d, the default).
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// - t=f (file): Payload is base64-encoded file path. Terminal reads image from that path.
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// - t=t (temp file): Payload is base64-encoded path in temp directory. Terminal reads, deletes.
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// - t=s Payload is base64-encoded POSIX shm name. Terminal reads from shared memory.
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// These modes require filesystem/IPC access not available in browsers. For Node.js/Electron:
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// 1. Check cmd.transmission (t key) before treating bytes as image data
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// 2. For t=f/t/s: decode bytes as UTF-8 string (the path/name), then read file contents
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// 3. For t=d: treat bytes as image data (current behavior)
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if (decodeError || bytes.length === 0) return true;
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const id = cmd.id ?? this._nextImageId++;
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const image: IKittyImageData = {
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id,
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data: new Blob([bytes as BlobPart]),
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width: cmd.width ?? 0,
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height: cmd.height ?? 0,
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format: (cmd.format ?? KittyFormat.RGBA) as 24 | 32 | 100,
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compression: cmd.compression ?? ''
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};
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this._images.set(id, image);
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return true;
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}
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private _handleTransmitDisplay(cmd: IKittyCommand, bytes: Uint8Array, decodeError: boolean): boolean | Promise<boolean> {
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if (decodeError) return true;
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const pendingKey = cmd.id ?? 0;
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this._handleTransmit(cmd, bytes, decodeError);
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// If still accumulating chunks, don't display yet
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if (this._pendingTransmissions.has(pendingKey)) return true;
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// Display the completed image
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const id = cmd.id ?? this._nextImageId - 1;
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const image = this._images.get(id);
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if (image) {
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const result = this._displayImage(image, cmd);
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if (cmd.id !== undefined) {
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return (result as Promise<boolean>).then(r => {
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this._sendResponse(id, 'OK', cmd.quiet ?? 0);
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return r;
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});
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}
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return result;
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}
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return true;
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}
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private _handleQuery(cmd: IKittyCommand, bytes: Uint8Array, decodeError: boolean): boolean {
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const id = cmd.id ?? 0;
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const quiet = cmd.quiet ?? 0;
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// Check decode error first (invalid base64)
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if (decodeError) {
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this._sendResponse(id, 'EINVAL:invalid base64 data', quiet);
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return true;
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}
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// Capability query (no payload) - just respond OK
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if (bytes.length === 0) {
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this._sendResponse(id, 'OK', quiet);
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return true;
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}
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const format = cmd.format ?? KittyFormat.RGBA;
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if (format === KittyFormat.PNG) {
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this._sendResponse(id, 'OK', quiet);
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} else {
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const width = cmd.width ?? 0;
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const height = cmd.height ?? 0;
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if (!width || !height) {
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this._sendResponse(id, 'EINVAL:width and height required for raw pixel data', quiet);
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return true;
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}
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const bytesPerPixel = format === KittyFormat.RGBA ? BYTES_PER_PIXEL_RGBA : BYTES_PER_PIXEL_RGB;
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const expectedBytes = width * height * bytesPerPixel;
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if (bytes.length < expectedBytes) {
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this._sendResponse(id, `EINVAL:insufficient pixel data`, quiet);
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return true;
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}
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this._sendResponse(id, 'OK', quiet);
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}
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return true;
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}
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private _handleDelete(cmd: IKittyCommand): boolean {
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const id = cmd.id;
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if (id !== undefined) {
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// Abort in-flight chunked upload for this specific image
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const pending = this._pendingTransmissions.get(id);
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if (pending) {
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pending.decoder.release();
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this._pendingTransmissions.delete(id);
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}
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this._images.delete(id);
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const storageId = this._kittyIdToStorageId.get(id);
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if (storageId !== undefined) {
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this._storage.deleteImage(storageId);
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this._kittyIdToStorageId.delete(id);
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}
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} else {
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// Abort all in-flight chunked uploads
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for (const pending of this._pendingTransmissions.values()) {
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pending.decoder.release();
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}
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this._pendingTransmissions.clear();
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this._images.clear();
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for (const storageId of this._kittyIdToStorageId.values()) {
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this._storage.deleteImage(storageId);
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}
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this._kittyIdToStorageId.clear();
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}
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return true;
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}
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private _sendResponse(id: number, message: string, quiet: number): void {
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const isOk = message === 'OK';
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if (isOk && quiet === 1) return;
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if (!isOk && quiet === 2) return;
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const response = `\x1b_Gi=${id};${message}\x1b\\`;
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this._coreTerminal._core.coreService.triggerDataEvent(response);
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}
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// Image display
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private _displayImage(image: IKittyImageData, cmd: IKittyCommand): boolean | Promise<boolean> {
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return this._decodeAndDisplay(image, cmd)
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.then(() => true)
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.catch(() => true);
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}
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private async _decodeAndDisplay(image: IKittyImageData, cmd: IKittyCommand): Promise<void> {
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const bitmap = await this._createBitmap(image);
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const cw = this._renderer.dimensions?.css.cell.width || CELL_SIZE_DEFAULT.width;
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const ch = this._renderer.dimensions?.css.cell.height || CELL_SIZE_DEFAULT.height;
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// Per spec: c/r default to image's natural cell dimensions
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const imgCols = cmd.columns ?? Math.ceil(bitmap.width / cw);
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const imgRows = cmd.rows ?? Math.ceil(bitmap.height / ch);
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let w = bitmap.width;
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let h = bitmap.height;
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// Scale bitmap to fit placement rectangle when c/r are specified
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if (cmd.columns !== undefined || cmd.rows !== undefined) {
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w = Math.round(imgCols * cw);
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h = Math.round(imgRows * ch);
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}
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if (w * h > this._opts.pixelLimit) return;
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// Save cursor position before addImage modifies it
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const buffer = this._coreTerminal._core.buffer;
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const savedX = buffer.x;
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const savedY = buffer.y;
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const savedYbase = buffer.ybase;
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let storageId: number;
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if (w !== bitmap.width || h !== bitmap.height) {
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const resized = await createImageBitmap(bitmap, { resizeWidth: w, resizeHeight: h });
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storageId = this._storage.addImage(resized);
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} else {
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storageId = this._storage.addImage(bitmap);
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}
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this._kittyIdToStorageId.set(image.id, storageId);
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// Kitty cursor movement
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// Per spec: cursor placed at first column after last image column,
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// on the last row of the image. C=1 means don't move cursor.
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if (cmd.cursorMovement === 1) {
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// C=1: restore cursor to position before image was placed
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const scrolled = buffer.ybase - savedYbase;
|
|
buffer.x = savedX;
|
|
buffer.y = Math.max(savedY - scrolled, 0);
|
|
} else {
|
|
// Default (C=0): advance cursor horizontally past the image
|
|
// addImage already positioned cursor on the last row via lineFeeds
|
|
buffer.x = Math.min(savedX + imgCols, this._coreTerminal.cols);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Create ImageBitmap from already-decoded image data.
|
|
*/
|
|
private async _createBitmap(image: IKittyImageData): Promise<ImageBitmap> {
|
|
let bytes: Uint8Array = new Uint8Array(await image.data.arrayBuffer());
|
|
|
|
if (image.compression === KittyCompression.ZLIB) {
|
|
bytes = await this._decompressZlib(bytes);
|
|
}
|
|
|
|
if (image.format === KittyFormat.PNG) {
|
|
const blob = new Blob([bytes as BlobPart], { type: 'image/png' });
|
|
if (!window.createImageBitmap) {
|
|
const url = URL.createObjectURL(blob);
|
|
const img = new Image();
|
|
return new Promise<ImageBitmap>((resolve, reject) => {
|
|
img.addEventListener('load', () => {
|
|
URL.revokeObjectURL(url);
|
|
const canvas = ImageRenderer.createCanvas(window.document, img.width, img.height);
|
|
canvas.getContext('2d')?.drawImage(img, 0, 0);
|
|
createImageBitmap(canvas).then(resolve).catch(reject);
|
|
});
|
|
img.addEventListener('error', reject);
|
|
img.src = url;
|
|
});
|
|
}
|
|
return createImageBitmap(blob);
|
|
}
|
|
|
|
// Raw pixel data
|
|
const width = image.width;
|
|
const height = image.height;
|
|
|
|
if (!width || !height) {
|
|
throw new Error('Width and height required for raw pixel data');
|
|
}
|
|
|
|
const bytesPerPixel = image.format === KittyFormat.RGBA ? BYTES_PER_PIXEL_RGBA : BYTES_PER_PIXEL_RGB;
|
|
const expectedBytes = width * height * bytesPerPixel;
|
|
|
|
if (bytes.length < expectedBytes) {
|
|
throw new Error('Insufficient pixel data');
|
|
}
|
|
|
|
const pixelCount = width * height;
|
|
const data = new Uint8ClampedArray(pixelCount * BYTES_PER_PIXEL_RGBA);
|
|
const isRgba = image.format === KittyFormat.RGBA;
|
|
|
|
let srcOffset = 0;
|
|
let dstOffset = 0;
|
|
for (let i = 0; i < pixelCount; i++) {
|
|
data[dstOffset] = bytes[srcOffset];
|
|
data[dstOffset + 1] = bytes[srcOffset + 1];
|
|
data[dstOffset + 2] = bytes[srcOffset + 2];
|
|
data[dstOffset + 3] = isRgba ? bytes[srcOffset + 3] : ALPHA_OPAQUE;
|
|
srcOffset += bytesPerPixel;
|
|
dstOffset += BYTES_PER_PIXEL_RGBA;
|
|
}
|
|
|
|
return createImageBitmap(new ImageData(data, width, height));
|
|
}
|
|
|
|
private async _decompressZlib(compressed: Uint8Array): Promise<Uint8Array> {
|
|
try {
|
|
return await this._decompress(compressed, 'deflate');
|
|
} catch {
|
|
return await this._decompress(compressed, 'deflate-raw');
|
|
}
|
|
}
|
|
|
|
private async _decompress(compressed: Uint8Array, format: 'deflate' | 'deflate-raw'): Promise<Uint8Array> {
|
|
const ds = new DecompressionStream(format);
|
|
const writer = ds.writable.getWriter();
|
|
writer.write(compressed as BufferSource);
|
|
writer.close();
|
|
|
|
const chunks: Uint8Array[] = [];
|
|
const reader = ds.readable.getReader();
|
|
|
|
while (true) {
|
|
const { done, value } = await reader.read();
|
|
if (done) break;
|
|
chunks.push(value);
|
|
}
|
|
|
|
const totalLength = chunks.reduce((sum, chunk) => sum + chunk.length, 0);
|
|
const result = new Uint8Array(totalLength);
|
|
let offset = 0;
|
|
for (const chunk of chunks) {
|
|
result.set(chunk, offset);
|
|
offset += chunk.length;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
public get images(): ReadonlyMap<number, IKittyImageData> {
|
|
return this._images;
|
|
}
|
|
|
|
public get pendingTransmissions(): ReadonlyMap<number, IPendingTransmission> {
|
|
return this._pendingTransmissions;
|
|
}
|
|
}
|