初始化奇妙小屏幕控制器项目

2026-09-08 22:56:52 +08:00
commit 8d368de3b5
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+export const SCENE_VERSION = 1;
+export const SCENE_WIDTH = 64;
+export const SCENE_HEIGHT = 64;
+export const RGB_CHANNELS = 3;
+export const RGBA_CHANNELS = 4;
+export const RGB_BYTE_LENGTH = SCENE_WIDTH * SCENE_HEIGHT * RGB_CHANNELS;
+export const RGBA_BYTE_LENGTH = SCENE_WIDTH * SCENE_HEIGHT * RGBA_CHANNELS;
+
+export const SCENE_STORAGE_KEY = "matrixController:scene";
+export const LEGACY_STORAGE_KEYS = Object.freeze({
+  sceneV1: "matrixController:scene:v1",
+  canvasV3: "matrixController:canvas:v3",
+  canvasV2: "matrixController:canvas:v2",
+  canvasRgb: "matrixCanvasRgb",
+  textV1: "matrixController:text:v1",
+});
+
+export const DEFAULT_TEXT_ELEMENT = Object.freeze({
+  type: "text",
+  text: "ok",
+  font: "default",
+  size: 12,
+  x: 32,
+  y: 26,
+  align: "center",
+  color: "#FFFFFF",
+  revision: 0,
+});
+
+const ALIGNMENTS = new Set(["left", "center", "right"]);
+const BASE64_ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+const HEX_COLOR = /^#[0-9A-Fa-f]{6}$/;
+
+function isRecord(value) {
+  return value !== null && typeof value === "object" && !Array.isArray(value);
+}
+
+function finiteInteger(value, fallback, minimum, maximum) {
+  const number = Number(value);
+  if (!Number.isFinite(number)) return fallback;
+  return Math.max(minimum, Math.min(maximum, Math.round(number)));
+}
+
+function normalizeColor(value, fallback = DEFAULT_TEXT_ELEMENT.color) {
+  return typeof value === "string" && HEX_COLOR.test(value.trim())
+    ? value.trim().toUpperCase()
+    : fallback;
+}
+
+function normalizeId(value) {
+  if (typeof value !== "string") return null;
+  const id = value.trim();
+  return id && id.length <= 128 ? id : null;
+}
+
+function byteArray(value, expectedLength) {
+  if (value === null || value === undefined || typeof value.length !== "number") return null;
+  if (value.length !== expectedLength) return null;
+  const result = new Uint8ClampedArray(expectedLength);
+  for (let index = 0; index < expectedLength; index += 1) {
+    const channel = value[index];
+    if (!Number.isInteger(channel) || channel < 0 || channel > 255) return null;
+    result[index] = channel;
+  }
+  return result;
+}
+
+function encodeBase64(bytes) {
+  let encoded = "";
+  for (let index = 0; index < bytes.length; index += 3) {
+    const first = bytes[index];
+    const hasSecond = index + 1 < bytes.length;
+    const hasThird = index + 2 < bytes.length;
+    const second = hasSecond ? bytes[index + 1] : 0;
+    const third = hasThird ? bytes[index + 2] : 0;
+    encoded += BASE64_ALPHABET[first >> 2];
+    encoded += BASE64_ALPHABET[((first & 3) << 4) | (second >> 4)];
+    encoded += hasSecond ? BASE64_ALPHABET[((second & 15) << 2) | (third >> 6)] : "=";
+    encoded += hasThird ? BASE64_ALPHABET[third & 63] : "=";
+  }
+  return encoded;
+}
+
+function decodeBase64(value) {
+  if (typeof value !== "string" || value.length % 4 !== 0) return null;
+  if (!/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$/.test(value)) return null;
+  const padding = value.endsWith("==") ? 2 : value.endsWith("=") ? 1 : 0;
+  const result = new Uint8ClampedArray((value.length / 4) * 3 - padding);
+  let output = 0;
+  for (let index = 0; index < value.length; index += 4) {
+    const first = BASE64_ALPHABET.indexOf(value[index]);
+    const second = BASE64_ALPHABET.indexOf(value[index + 1]);
+    const third = value[index + 2] === "=" ? 0 : BASE64_ALPHABET.indexOf(value[index + 2]);
+    const fourth = value[index + 3] === "=" ? 0 : BASE64_ALPHABET.indexOf(value[index + 3]);
+    const packed = (first << 18) | (second << 12) | (third << 6) | fourth;
+    if (output < result.length) result[output++] = (packed >> 16) & 255;
+    if (output < result.length) result[output++] = (packed >> 8) & 255;
+    if (output < result.length) result[output++] = packed & 255;
+  }
+  return result;
+}
+
+function parseJsonValue(value) {
+  if (typeof value !== "string") return value;
+  try {
+    return JSON.parse(value);
+  } catch (_error) {
+    return null;
+  }
+}
+
+function sourceValue(source, alias, storageKey) {
+  if (!isRecord(source)) return null;
+  if (Object.prototype.hasOwnProperty.call(source, alias)) return source[alias];
+  if (Object.prototype.hasOwnProperty.call(source, storageKey)) return source[storageKey];
+  return null;
+}
+
+function copyTextElement(element) {
+  return {
+    id: element.id,
+    type: "text",
+    text: element.text,
+    font: element.font,
+    size: element.size,
+    x: element.x,
+    y: element.y,
+    align: element.align,
+    color: element.color,
+    revision: element.revision,
+  };
+}
+
+function storageTextElement(element) {
+  const { revision: _revision, ...stored } = copyTextElement(element);
+  return stored;
+}
+
+function normalizedElementList(elements) {
+  if (!Array.isArray(elements)) return [];
+  const normalized = [];
+  const usedIds = new Set();
+  for (const value of elements) {
+    const element = normalizeTextElement(value, { strict: true });
+    if (!element || usedIds.has(element.id)) continue;
+    usedIds.add(element.id);
+    normalized.push(element);
+  }
+  return normalized;
+}
+
+function assertScene(scene) {
+  if (!isRecord(scene)) throw new TypeError("scene must be an object");
+  if (scene.version !== SCENE_VERSION || scene.width !== SCENE_WIDTH || scene.height !== SCENE_HEIGHT) {
+    throw new RangeError("scene must be version 1 with a 64x64 frame");
+  }
+  const pixels = byteArray(scene.pixels, RGB_BYTE_LENGTH);
+  if (!pixels) throw new RangeError("scene pixels must contain 64x64 RGB888 bytes");
+  if (!Array.isArray(scene.elements)) throw new TypeError("scene elements must be an array");
+  const elements = normalizedElementList(scene.elements);
+  if (elements.length !== scene.elements.length) throw new TypeError("scene contains an invalid or duplicate element");
+  return { pixels, elements };
+}
+
+function sceneWithElements(scene, elements) {
+  const checked = assertScene(scene);
+  return {
+    version: SCENE_VERSION,
+    width: SCENE_WIDTH,
+    height: SCENE_HEIGHT,
+    pixels: checked.pixels,
+    elements: elements.map(copyTextElement),
+  };
+}
+
+export function createRgbPixels(color = [0, 0, 0]) {
+  const channels = byteArray(color, RGB_CHANNELS);
+  if (!channels) throw new RangeError("color must contain three RGB bytes");
+  const pixels = new Uint8ClampedArray(RGB_BYTE_LENGTH);
+  for (let offset = 0; offset < pixels.length; offset += RGB_CHANNELS) pixels.set(channels, offset);
+  return pixels;
+}
+
+export function createScene({ pixels = createRgbPixels(), elements = [] } = {}) {
+  const checkedPixels = byteArray(pixels, RGB_BYTE_LENGTH);
+  if (!checkedPixels) throw new RangeError("scene pixels must contain 64x64 RGB888 bytes");
+  return {
+    version: SCENE_VERSION,
+    width: SCENE_WIDTH,
+    height: SCENE_HEIGHT,
+    pixels: checkedPixels,
+    elements: normalizedElementList(elements),
+  };
+}
+
+export function sceneToStorageValue(scene) {
+  const checked = assertScene(scene);
+  return {
+    version: SCENE_VERSION,
+    width: SCENE_WIDTH,
+    height: SCENE_HEIGHT,
+    pixelRgb: encodeBase64(checked.pixels),
+    elements: checked.elements.map(storageTextElement),
+  };
+}
+
+export function serializeScene(scene) {
+  return JSON.stringify(sceneToStorageValue(scene));
+}
+
+export function deserializeScene(value) {
+  const stored = parseJsonValue(value);
+  if (!isRecord(stored)) return null;
+  if (stored.version !== SCENE_VERSION || stored.width !== SCENE_WIDTH || stored.height !== SCENE_HEIGHT) return null;
+  const decoded = decodeBase64(stored.pixelRgb);
+  if (!decoded || decoded.length !== RGB_BYTE_LENGTH) return null;
+  return createScene({
+    pixels: decoded,
+    elements: normalizedElementList(stored.elements),
+  });
+}
+
+export function inspectSceneStorageValue(value) {
+  if (value === null || value === undefined) return { status: "missing", scene: null };
+  let stored = value;
+  if (typeof value === "string") {
+    try {
+      stored = JSON.parse(value);
+    } catch (_error) {
+      return { status: "damaged", scene: null };
+    }
+  }
+  if (!isRecord(stored)) return { status: "damaged", scene: null };
+  if (Number.isInteger(stored.version) && stored.version > SCENE_VERSION) {
+    return { status: "future", scene: null };
+  }
+  const restored = deserializeScene(stored);
+  return restored
+    ? { status: "valid", scene: restored }
+    : { status: "damaged", scene: null };
+}
+
+export function nextTextElementId(elements = []) {
+  const used = new Set(
+    Array.isArray(elements)
+      ? elements.map((element) => normalizeId(element?.id)).filter(Boolean)
+      : [],
+  );
+  let sequence = 1;
+  while (used.has(`text-${sequence}`)) sequence += 1;
+  return `text-${sequence}`;
+}
+
+export function normalizeTextElement(value = {}, { id = null, strict = false } = {}) {
+  if (!isRecord(value) || (value.type !== undefined && value.type !== "text")) return null;
+  if (strict && (typeof value.text !== "string" || !normalizeId(value.id))) return null;
+  const normalizedId = normalizeId(value.id) || normalizeId(id) || "text-1";
+  const text = typeof value.text === "string" ? value.text.slice(0, 512) : DEFAULT_TEXT_ELEMENT.text;
+  const font = typeof value.font === "string" && value.font.trim()
+    ? value.font.trim().slice(0, 512)
+    : DEFAULT_TEXT_ELEMENT.font;
+  return {
+    id: normalizedId,
+    type: "text",
+    text,
+    font,
+    size: finiteInteger(value.size, DEFAULT_TEXT_ELEMENT.size, 1, 64),
+    x: finiteInteger(value.x, DEFAULT_TEXT_ELEMENT.x, -128, 128),
+    y: finiteInteger(value.y, DEFAULT_TEXT_ELEMENT.y, -128, 128),
+    align: ALIGNMENTS.has(value.align) ? value.align : DEFAULT_TEXT_ELEMENT.align,
+    color: normalizeColor(value.color),
+    revision: finiteInteger(value.revision, 0, 0, Number.MAX_SAFE_INTEGER),
+  };
+}
+
+export function createTextElement(existingElements = [], overrides = {}) {
+  const id = nextTextElementId(existingElements);
+  return normalizeTextElement({ ...DEFAULT_TEXT_ELEMENT, ...overrides, id }, { id });
+}
+
+export function addTextElement(scene, overrides = {}) {
+  const checked = assertScene(scene);
+  const element = createTextElement(checked.elements, overrides);
+  return sceneWithElements(scene, [...checked.elements, element]);
+}
+
+export function updateTextElement(scene, id, patch = {}) {
+  const checked = assertScene(scene);
+  const targetId = normalizeId(id);
+  const index = checked.elements.findIndex((element) => element.id === targetId);
+  if (index < 0 || !isRecord(patch)) return scene;
+  const current = checked.elements[index];
+  const updated = normalizeTextElement({
+    ...current,
+    ...patch,
+    id: current.id,
+    type: "text",
+    revision: current.revision + 1,
+  }, { id: current.id });
+  const elements = checked.elements.map((element, elementIndex) => (
+    elementIndex === index ? updated : copyTextElement(element)
+  ));
+  return sceneWithElements(scene, elements);
+}
+
+export function deleteTextElement(scene, id) {
+  const checked = assertScene(scene);
+  const targetId = normalizeId(id);
+  if (!checked.elements.some((element) => element.id === targetId)) return scene;
+  return sceneWithElements(scene, checked.elements.filter((element) => element.id !== targetId));
+}
+
+export function duplicateTextElement(scene, id) {
+  const checked = assertScene(scene);
+  const source = checked.elements.find((element) => element.id === normalizeId(id));
+  if (!source) return scene;
+  const duplicate = createTextElement(checked.elements, {
+    ...source,
+    x: source.x + 2,
+    y: source.y + 2,
+    revision: 0,
+  });
+  return sceneWithElements(scene, [...checked.elements, duplicate]);
+}
+
+function legacyCanvasPixels(value) {
+  const parsed = parseJsonValue(value);
+  if (!isRecord(parsed)) return null;
+  return byteArray(parsed.pixels, RGB_BYTE_LENGTH);
+}
+
+function legacyCsvPixels(value) {
+  if (typeof value !== "string") return byteArray(value, RGB_BYTE_LENGTH);
+  const channels = value.split(",").map((channel) => Number(channel));
+  return byteArray(channels, RGB_BYTE_LENGTH);
+}
+
+function migrateTextV1(value, options) {
+  const parsed = parseJsonValue(value);
+  if (!isRecord(parsed)) return null;
+  const text = parsed["text-value"] ?? parsed.text;
+  if (typeof text !== "string") return null;
+  return normalizeTextElement({
+    id: "text-1",
+    type: "text",
+    text,
+    font: parsed["text-font"] ?? parsed.font ?? options.defaultFont,
+    size: parsed["text-size"] ?? parsed.size ?? options.defaultTextSize,
+    x: parsed["text-x"] ?? parsed.x,
+    y: parsed["text-y"] ?? parsed.y,
+    align: parsed["text-align"] ?? parsed.align,
+    color: parsed["text-color"] ?? parsed.color,
+  }, { id: "text-1" });
+}
+
+export function migrateLegacyScene(source = {}, options = {}) {
+  const migrationOptions = {
+    defaultFont: typeof options.defaultFont === "string" && options.defaultFont.trim()
+      ? options.defaultFont.trim()
+      : DEFAULT_TEXT_ELEMENT.font,
+    defaultTextSize: finiteInteger(options.defaultTextSize, DEFAULT_TEXT_ELEMENT.size, 1, 64),
+  };
+  const canvasCandidates = [
+    ["canvasV3", LEGACY_STORAGE_KEYS.canvasV3],
+    ["canvasV2", LEGACY_STORAGE_KEYS.canvasV2],
+  ];
+  let pixels = null;
+  for (const [alias, storageKey] of canvasCandidates) {
+    pixels = legacyCanvasPixels(sourceValue(source, alias, storageKey));
+    if (pixels) break;
+  }
+  if (!pixels) {
+    pixels = legacyCsvPixels(sourceValue(source, "matrixCanvasRgb", LEGACY_STORAGE_KEYS.canvasRgb));
+  }
+  const text = migrateTextV1(
+    sourceValue(source, "textV1", LEGACY_STORAGE_KEYS.textV1),
+    migrationOptions,
+  );
+  if (!pixels && !text) return null;
+  return createScene({
+    pixels: pixels || createRgbPixels(),
+    elements: text ? [text] : [],
+  });
+}
+
+function draftLoadResult(scene, {
+  canPersist,
+  status,
+  notice = null,
+} = {}) {
+  return { scene, canPersist, status, notice };
+}
+
+function blockedDraft(scene, status, notice) {
+  return draftLoadResult(scene, { canPersist: false, status, notice });
+}
+
+function readStorageSnapshot(storage) {
+  if (!storage || typeof storage.getItem !== "function") {
+    throw new TypeError("browser storage is unavailable");
+  }
+  const values = {};
+  values.current = storage.getItem(SCENE_STORAGE_KEY);
+  for (const [alias, key] of Object.entries(LEGACY_STORAGE_KEYS)) {
+    values[alias] = storage.getItem(key);
+  }
+  return values;
+}
+
+function invalidSplitLegacyKeys(values) {
+  const invalid = [];
+  if (values.canvasV3 !== null && !legacyCanvasPixels(values.canvasV3)) invalid.push(LEGACY_STORAGE_KEYS.canvasV3);
+  if (values.canvasV2 !== null && !legacyCanvasPixels(values.canvasV2)) invalid.push(LEGACY_STORAGE_KEYS.canvasV2);
+  if (values.canvasRgb !== null && !legacyCsvPixels(values.canvasRgb)) invalid.push(LEGACY_STORAGE_KEYS.canvasRgb);
+  if (values.textV1 !== null && !migrateTextV1(values.textV1, {
+    defaultFont: DEFAULT_TEXT_ELEMENT.font,
+    defaultTextSize: DEFAULT_TEXT_ELEMENT.size,
+  })) invalid.push(LEGACY_STORAGE_KEYS.textV1);
+  return invalid;
+}
+
+function writeMigratedDraft(storage, scene, hasLegacyData) {
+  try {
+    if (typeof storage.setItem !== "function") throw new TypeError("browser storage is read-only");
+    storage.setItem(SCENE_STORAGE_KEY, serializeScene(scene));
+  } catch (_error) {
+    return blockedDraft(
+      scene,
+      "write-failed",
+      hasLegacyData
+        ? "浏览器无法写入升级后的画板草稿；旧草稿已原样保留，本页不会覆盖它。"
+        : "浏览器无法初始化画板草稿；本页编辑不会自动保存或应用。",
+    );
+  }
+
+  if (!hasLegacyData) {
+    return draftLoadResult(scene, { canPersist: true, status: "created" });
+  }
+
+  const cleanupFailures = [];
+  for (const key of Object.values(LEGACY_STORAGE_KEYS)) {
+    try {
+      if (typeof storage.removeItem !== "function") throw new TypeError("browser storage cannot remove old keys");
+      storage.removeItem(key);
+    } catch (_error) {
+      cleanupFailures.push(key);
+    }
+  }
+  if (cleanupFailures.length) {
+    return draftLoadResult(scene, {
+      canPersist: true,
+      status: "cleanup-warning",
+      notice: "画板草稿已升级，但部分旧版草稿键无法清理；旧值仍被保留。",
+    });
+  }
+  return draftLoadResult(scene, {
+    canPersist: true,
+    status: "migrated",
+    notice: "已将旧版浏览器画板草稿升级到当前格式。",
+  });
+}
+
+export function restoreSceneDraft(storage) {
+  const blankScene = createScene();
+  let values;
+  try {
+    values = readStorageSnapshot(storage);
+  } catch (_error) {
+    return blockedDraft(
+      blankScene,
+      "read-failed",
+      "浏览器草稿存储不可用；本页不会自动保存或应用空白画板。",
+    );
+  }
+
+  const current = inspectSceneStorageValue(values.current);
+  if (current.status === "valid") {
+    return draftLoadResult(current.scene, { canPersist: true, status: "current" });
+  }
+  if (current.status === "future") {
+    return blockedDraft(
+      blankScene,
+      "future-version",
+      "检测到更高版本的浏览器画板草稿；原值已保留，本页不会覆盖或应用它。",
+    );
+  }
+  if (current.status === "damaged") {
+    return blockedDraft(
+      blankScene,
+      "damaged-current",
+      "浏览器画板草稿损坏或格式无法识别；原值已保留，本页不会覆盖或应用它。",
+    );
+  }
+
+  const legacyScene = inspectSceneStorageValue(values.sceneV1);
+  if (legacyScene.status === "future") {
+    return blockedDraft(
+      blankScene,
+      "future-legacy-version",
+      "旧版草稿键中包含更高版本数据；原值已保留，本页不会覆盖或应用它。",
+    );
+  }
+  if (legacyScene.status === "damaged") {
+    return blockedDraft(
+      blankScene,
+      "damaged-legacy-scene",
+      "旧版画板草稿损坏或无法迁移；原值已保留，本页不会覆盖或应用它。",
+    );
+  }
+
+  const hasSplitLegacyData = ["canvasV3", "canvasV2", "canvasRgb", "textV1"]
+    .some((alias) => values[alias] !== null);
+  const hasLegacyData = values.sceneV1 !== null || hasSplitLegacyData;
+  const invalidLegacyKeys = invalidSplitLegacyKeys(values);
+  const migrated = migrateLegacyScene({
+    canvasV3: values.canvasV3,
+    canvasV2: values.canvasV2,
+    matrixCanvasRgb: values.canvasRgb,
+    textV1: values.textV1,
+  });
+  if (invalidLegacyKeys.length) {
+    return blockedDraft(
+      legacyScene.scene || migrated || blankScene,
+      "legacy-migration-failed",
+      "旧版画布或文字草稿损坏，无法安全迁移；旧值已保留，本页不会覆盖或应用它。",
+    );
+  }
+  if (legacyScene.status === "valid") {
+    return writeMigratedDraft(storage, legacyScene.scene, hasLegacyData);
+  }
+  if (hasSplitLegacyData && !migrated) {
+    return blockedDraft(
+      blankScene,
+      "legacy-migration-failed",
+      "旧版画布或文字草稿损坏，无法安全迁移；旧值已保留，本页不会覆盖或应用它。",
+    );
+  }
+  return writeMigratedDraft(storage, migrated || blankScene, hasLegacyData);
+}
+
+function compositeInto(target, rgba) {
+  for (let sourceOffset = 0, targetOffset = 0; sourceOffset < rgba.length; sourceOffset += 4, targetOffset += 3) {
+    const alpha = rgba[sourceOffset + 3];
+    if (alpha === 0) continue;
+    if (alpha === 255) {
+      target[targetOffset] = rgba[sourceOffset];
+      target[targetOffset + 1] = rgba[sourceOffset + 1];
+      target[targetOffset + 2] = rgba[sourceOffset + 2];
+      continue;
+    }
+    const inverse = 255 - alpha;
+    target[targetOffset] = Math.round((rgba[sourceOffset] * alpha + target[targetOffset] * inverse) / 255);
+    target[targetOffset + 1] = Math.round((rgba[sourceOffset + 1] * alpha + target[targetOffset + 1] * inverse) / 255);
+    target[targetOffset + 2] = Math.round((rgba[sourceOffset + 2] * alpha + target[targetOffset + 2] * inverse) / 255);
+  }
+}
+
+export function compositeRgbaLayer(pixels, rgba) {
+  const result = byteArray(pixels, RGB_BYTE_LENGTH);
+  const layer = byteArray(rgba, RGBA_BYTE_LENGTH);
+  if (!result) throw new RangeError("base pixels must contain 64x64 RGB888 bytes");
+  if (!layer) throw new RangeError("layer must contain 64x64 RGBA8888 bytes");
+  compositeInto(result, layer);
+  return result;
+}
+
+export function compositeRgbaLayers(pixels, layers = []) {
+  const result = byteArray(pixels, RGB_BYTE_LENGTH);
+  if (!result) throw new RangeError("base pixels must contain 64x64 RGB888 bytes");
+  if (!Array.isArray(layers)) throw new TypeError("layers must be an array");
+  for (const value of layers) {
+    const layer = byteArray(value, RGBA_BYTE_LENGTH);
+    if (!layer) throw new RangeError("each layer must contain 64x64 RGBA8888 bytes");
+    compositeInto(result, layer);
+  }
+  return result;
+}