[改善] コメント座標の遅延評価機能を追加

src/@types/IComment.ts

@@ -4,6 +4,7 @@ import type { IRenderer } from "@/@types/renderer";
 export interface IComment {
   comment: FormattedCommentWithSize;
   invisible: boolean;
+  index: number;
   loc: CommentLoc;
   width: number;
   long: number;

src/@types/options.ts

@@ -41,6 +41,7 @@ export type BaseOptions = {
   showFPS: boolean;
   useLegacy: boolean;
   video: HTMLVideoElement | undefined;
+  lazy: boolean;
 };
 export type Options = Partial<BaseOptions>;
 

src/comments/BaseComment.ts

@@ -30,19 +30,22 @@ class BaseComment implements IComment {
   public readonly pluginName: string = "BaseComment";
   public image?: IRenderer | null;
   public buttonImage?: IRenderer | null;
+  public index: number;
 
   /**
    * コンストラクタ
    * @param comment 処理対象のコメント
    * @param renderer 描画対象のレンダラークラス
+   * @param index コメントのインデックス
    */
-  constructor(comment: FormattedComment, renderer: IRenderer) {
+  constructor(comment: FormattedComment, renderer: IRenderer, index: number) {
     this.renderer = renderer;
     this.posY = 0;
     this.pos = { x: 0, y: 0 };
     comment.content = comment.content.replace(/\t/g, "\u2003\u2003");
     this.comment = this.convertComment(comment);
     this.cacheKey = this.getCacheKey();
+    this.index = index;
   }
   get invisible() {
     return this.comment.invisible;

src/comments/FlashComment.ts

@@ -34,8 +34,8 @@ class FlashComment extends BaseComment {
   private _globalScale: number;
   override readonly pluginName: string = "FlashComment";
   override buttonImage: IRenderer;
-  constructor(comment: FormattedComment, renderer: IRenderer) {
-    super(comment, renderer);
+  constructor(comment: FormattedComment, renderer: IRenderer, index: number) {
+    super(comment, renderer, index);
     this._globalScale ??= getConfig(config.commentScale, true);
     this.buttonImage = renderer.getCanvas();
   }

src/comments/HTML5Comment.ts

@@ -28,8 +28,8 @@ import { BaseComment } from "./BaseComment";
 
 class HTML5Comment extends BaseComment {
   override readonly pluginName: string = "HTML5Comment";
-  constructor(comment: FormattedComment, context: IRenderer) {
-    super(comment, context);
+  constructor(comment: FormattedComment, context: IRenderer, index: number) {
+    super(comment, context, index);
     this.posY = 0;
   }
 

src/definition/config.ts

@@ -26,6 +26,7 @@ const defaultOptions: BaseOptions = {
   showFPS: false,
   useLegacy: false,
   video: undefined,
+  lazy: false,
 };
 
 let config: BaseConfig;

src/main.ts

@@ -53,6 +53,8 @@ class NiconiComments {
   public showFPS: boolean;
   public showCommentCount: boolean;
   private lastVpos: number;
+  private processedCommentIndex: number;
+  private comments: IComment[];
   private readonly renderer: IRenderer;
   private readonly collision: Collision;
   private readonly timeline: Timeline;
@@ -135,26 +137,29 @@ class NiconiComments {
       right: [],
     };
     this.lastVpos = -1;
-    this.preRendering(parsedData);
+    this.processedCommentIndex = 0;
+
+    this.comments = this.preRendering(parsedData);
 
     logger(`constructor complete: ${performance.now() - constructorStart}ms`);
   }
 
   /**
    * 事前に当たり判定を考慮してコメントの描画場所を決定する
    * @param rawData コメントデータ
+   * @returns コメントのインスタンス配列
    */
   private preRendering(rawData: FormattedComment[]) {
     const preRenderingStart = performance.now();
     if (options.keepCA) {
       rawData = changeCALayer(rawData);
     }
-    let instances = rawData.reduce<IComment[]>((pv, val) => {
-      pv.push(createCommentInstance(val, this.renderer));
+    let instances = rawData.reduce<IComment[]>((pv, val, index) => {
+      pv.push(createCommentInstance(val, this.renderer, index));
       return pv;
     }, []);
-    this.getCommentPos(instances);
-    this.sortComment();
+    this.getCommentPos(instances, instances.length, options.lazy);
+    this.sortTimelineComment();
 
     const plugins: IPluginList = [];
     for (const plugin of config.plugins) {
@@ -175,25 +180,34 @@ class NiconiComments {
 
     setPlugins(plugins);
     logger(`preRendering complete: ${performance.now() - preRenderingStart}ms`);
+    return instances;
   }
 
   /**
    * 計算された描画サイズをもとに各コメントの配置位置を決定する
    * @param data コメントデータ
+   * @param end 終了インデックス
+   * @param lazy 遅延処理を行うか
    */
-  private getCommentPos(data: IComment[]) {
+  private getCommentPos(data: IComment[], end: number, lazy: boolean = false) {
     const getCommentPosStart = performance.now();
-    for (const comment of data) {
+    if (this.processedCommentIndex + 1 >= end) return;
+    for (const comment of data.slice(this.processedCommentIndex, end)) {
       if (comment.invisible) continue;
       if (comment.loc === "naka") {
-        processMovableComment(comment, this.collision, this.timeline);
+        processMovableComment(comment, this.collision, this.timeline, lazy);
       } else {
         processFixedComment(
           comment,
           this.collision[comment.loc],
           this.timeline,
+          lazy,
         );
       }
+      this.processedCommentIndex = comment.index;
+    }
+    if (lazy) {
+      this.processedCommentIndex = 0;
     }
     logger(
       `getCommentPos complete: ${performance.now() - getCommentPosStart}ms`,
@@ -203,7 +217,7 @@ class NiconiComments {
   /**
    * 投稿者コメントを前に移動
    */
-  private sortComment() {
+  private sortTimelineComment() {
     const sortCommentStart = performance.now();
     for (const vpos of Object.keys(this.timeline)) {
       const item = this.timeline[Number(vpos)];
@@ -228,8 +242,10 @@ class NiconiComments {
    * @param rawComments コメントデータ
    */
   public addComments(...rawComments: FormattedComment[]) {
-    const comments = rawComments.reduce<IComment[]>((pv, val) => {
-      pv.push(createCommentInstance(val, this.renderer));
+    const comments = rawComments.reduce<IComment[]>((pv, val, index) => {
+      pv.push(
+        createCommentInstance(val, this.renderer, this.comments.length + index),
+      );
       return pv;
     }, []);
     for (const plugin of plugins) {
@@ -333,6 +349,7 @@ class NiconiComments {
         if (comment.invisible) {
           continue;
         }
+        this.getCommentPos(this.comments, comment.index + 1);
         comment.draw(vpos, this.showCollision, cursor);
       }
     }

src/utils/comment.ts

@@ -585,25 +585,15 @@ const isBanActive = (vpos: number): boolean => {
  * @param comment 固定コメント
  * @param collision コメントの衝突判定用配列
  * @param timeline コメントのタイムライン
+ * @param lazy Y座標の計算を遅延させるか
  */
 const processFixedComment = (
   comment: IComment,
   collision: CollisionItem,
   timeline: Timeline,
+  lazy: boolean = false,
 ) => {
-  let posY = 0,
-    isChanged = true,
-    count = 0;
-  while (isChanged && count < 10) {
-    isChanged = false;
-    count++;
-    for (let j = 0; j < comment.long; j++) {
-      const result = getPosY(posY, comment, collision[comment.vpos + j]);
-      posY = result.currentPos;
-      isChanged = result.isChanged;
-      if (result.isBreak) break;
-    }
-  }
+  const posY = lazy ? -1 : getFixedPosY(comment, collision);
   for (let j = 0; j < comment.long; j++) {
     const vpos = comment.vpos + j;
     arrayPush(timeline, vpos, comment);
@@ -618,49 +608,17 @@ const processFixedComment = (
  * @param comment nakaコメント
  * @param collision コメントの衝突判定用配列
  * @param timeline コメントのタイムライン
+ * @param lazy Y座標の計算を遅延させるか
  */
 const processMovableComment = (
   comment: IComment,
   collision: Collision,
   timeline: Timeline,
+  lazy: boolean = false,
 ) => {
   const beforeVpos =
     Math.round(-288 / ((1632 + comment.width) / (comment.long + 125))) - 100;
-  const posY = (() => {
-    if (config.canvasHeight < comment.height) {
-      return (comment.height - config.canvasHeight) / -2;
-    }
-    let posY = 0;
-    let isChanged = true;
-    while (isChanged) {
-      isChanged = false;
-      for (let j = beforeVpos, n = comment.long + 125; j < n; j++) {
-        const vpos = comment.vpos + j;
-        const leftPos = getPosX(comment.comment, vpos);
-        let isBreak = false;
-        if (
-          leftPos + comment.width >= config.collisionRange.right &&
-          leftPos <= config.collisionRange.right
-        ) {
-          const result = getPosY(posY, comment, collision.right[vpos]);
-          posY = result.currentPos;
-          isChanged ||= result.isChanged;
-          isBreak = result.isBreak;
-        }
-        if (
-          leftPos + comment.width >= config.collisionRange.left &&
-          leftPos <= config.collisionRange.left
-        ) {
-          const result = getPosY(posY, comment, collision.left[vpos]);
-          posY = result.currentPos;
-          isChanged ||= result.isChanged;
-          isBreak = result.isBreak;
-        }
-        if (isBreak) return posY;
-      }
-    }
-    return posY;
-  })();
+  const posY = lazy ? -1 : getMovablePosY(comment, collision, beforeVpos);
   for (let j = beforeVpos, n = comment.long + 125; j < n; j++) {
     const vpos = comment.vpos + j;
     const leftPos = getPosX(comment.comment, vpos);
@@ -683,6 +641,63 @@ const processMovableComment = (
   comment.posY = posY;
 };
 
+const getFixedPosY = (comment: IComment, collision: CollisionItem) => {
+  let posY = 0,
+    isChanged = true,
+    count = 0;
+  while (isChanged && count < 10) {
+    isChanged = false;
+    count++;
+    for (let j = 0; j < comment.long; j++) {
+      const result = getPosY(posY, comment, collision[comment.vpos + j]);
+      posY = result.currentPos;
+      isChanged = result.isChanged;
+      if (result.isBreak) break;
+    }
+  }
+  return posY;
+};
+
+const getMovablePosY = (
+  comment: IComment,
+  collision: Collision,
+  beforeVpos: number,
+) => {
+  if (config.canvasHeight < comment.height) {
+    return (comment.height - config.canvasHeight) / -2;
+  }
+  let posY = 0;
+  let isChanged = true;
+  while (isChanged) {
+    isChanged = false;
+    for (let j = beforeVpos, n = comment.long + 125; j < n; j++) {
+      const vpos = comment.vpos + j;
+      const leftPos = getPosX(comment.comment, vpos);
+      let isBreak = false;
+      if (
+        leftPos + comment.width >= config.collisionRange.right &&
+        leftPos <= config.collisionRange.right
+      ) {
+        const result = getPosY(posY, comment, collision.right[vpos]);
+        posY = result.currentPos;
+        isChanged ||= result.isChanged;
+        isBreak = result.isBreak;
+      }
+      if (
+        leftPos + comment.width >= config.collisionRange.left &&
+        leftPos <= config.collisionRange.left
+      ) {
+        const result = getPosY(posY, comment, collision.left[vpos]);
+        posY = result.currentPos;
+        isChanged ||= result.isChanged;
+        isBreak = result.isBreak;
+      }
+      if (isBreak) return posY;
+    }
+  }
+  return posY;
+};
+
 /**
  * 当たり判定からコメントを配置できる場所を探す
  * @param currentPos 現在のy座標
@@ -779,6 +794,8 @@ const parseFont = (font: CommentFont, size: string | number): string => {
 
 export {
   getDefaultCommand,
+  getFixedPosY,
+  getMovablePosY,
   getPosX,
   getPosY,
   isBanActive,

src/utils/plugins.ts

@@ -7,18 +7,20 @@ import { config } from "@/definition/config";
  * コメントのインスタンスを生成する
  * @param comment コメント
  * @param context 描画対象のCanvasコンテキスト
+ * @param index コメントのインデックス
  * @returns プラグインまたは内臓のコメントインスタンス
  */
 const createCommentInstance = (
   comment: FormattedComment,
   context: IRenderer,
+  index: number,
 ) => {
   for (const plugin of config.commentPlugins) {
     if (plugin.condition(comment)) {
-      return new plugin.class(comment, context);
+      return new plugin.class(comment, context, index);
     }
   }
-  return new HTML5Comment(comment, context);
+  return new HTML5Comment(comment, context, index);
 };
 
 export { createCommentInstance };