feat: add dataURLOptions parameter control canvas image format and quality

docs/recipes/canvas.md

@@ -21,6 +21,11 @@ rrweb.record({
   sampling: {
     canvas: 15,
   },
+  // optional image format settings
+  dataURLOptions: {
+    type: 'image/webp',
+    quality: 0.6,
+  },
 });
 ```
 

docs/recipes/canvas.zh_CN.md

@@ -21,6 +21,11 @@ rrweb.record({
   sampling: {
     canvas: 15,
   },
+  // 图像的格式
+  dataURLOptions: {
+    type: 'image/webp',
+    quality: 0.6,
+  },
 });
 ```
 

guide.md

@@ -151,6 +151,7 @@ The parameter of `rrweb.record` accepts the following options.
 | maskInputFn          | -                  | customize mask input content recording logic                                                                                                                                                  |
 | maskTextFn           | -                  | customize mask text content recording logic                                                                                                                                                   |
 | slimDOMOptions       | {}                 | remove unnecessary parts of the DOM <br />refer to the [list](https://github.com/rrweb-io/rrweb/blob/588164aa12f1d94576f89ae0210b98f6e971c895/packages/rrweb-snapshot/src/types.ts#L97-L108)  |
+| dataURLOptions       | {}                 | Canvas image format and quality ,This parameter will be passed to the OffscreenCanvas.convertToBlob(),Using this parameter effectively reduces the size of the recorded data                  |
 | inlineStylesheet     | true               | whether to inline the stylesheet in the events                                                                                                                                                |
 | hooks                | {}                 | hooks for events<br />refer to the [list](https://github.com/rrweb-io/rrweb/blob/9488deb6d54a5f04350c063d942da5e96ab74075/src/types.ts#L207)                                                  |
 | packFn               | -                  | refer to the [storage optimization recipe](./docs/recipes/optimize-storage.md)                                                                                                                |

guide.zh_CN.md

@@ -151,6 +151,7 @@ setInterval(save, 10 * 1000);
 | hooks                | {}                 | 各类事件的回调<br />类型详见[列表](https://github.com/rrweb-io/rrweb/blob/9488deb6d54a5f04350c063d942da5e96ab74075/src/types.ts#L207)                                                 |
 | packFn               | -                  | 数据压缩函数，详见[优化存储策略](./docs/recipes/optimize-storage.zh_CN.md)                                                                                                            |
 | sampling             | -                  | 数据抽样策略，详见[优化存储策略](./docs/recipes/optimize-storage.zh_CN.md)                                                                                                            |
+| dataURLOptions       | {}                 | Canvas 图像快照的格式和质量,这个参数将传递给 OffscreenCanvas.convertToBlob()，使用这个参数能有效减小录制数据的大小                                                                    |
 | recordCanvas         | false              | 是否记录 canvas 内容, 可用选项：false, true                                                                                                                                           |
 | inlineImages         | false              | 是否将图片内容记内联录制                                                                                                                                                              |
 | collectFonts         | false              | 是否记录页面中的字体文件                                                                                                                                                              |

packages/rrweb/src/record/index.ts

@@ -64,6 +64,7 @@ function record<T = eventWithTime>(
     hooks,
     packFn,
     sampling = {},
+    dataURLOptions = {},
     mousemoveWait,
     recordCanvas = false,
     userTriggeredOnInput = false,
@@ -240,6 +241,7 @@ function record<T = eventWithTime>(
     blockSelector,
     mirror,
     sampling: sampling.canvas,
+    dataURLOptions,
   });
 
   const shadowDomManager = new ShadowDomManager({
@@ -252,6 +254,7 @@ function record<T = eventWithTime>(
       maskTextSelector,
       inlineStylesheet,
       maskInputOptions,
+      dataURLOptions,
       maskTextFn,
       maskInputFn,
       recordCanvas,
@@ -290,6 +293,7 @@ function record<T = eventWithTime>(
       maskAllInputs: maskInputOptions,
       maskTextFn,
       slimDOM: slimDOMOptions,
+      dataURLOptions,
       recordCanvas,
       inlineImages,
       onSerialize: (n) => {
@@ -471,6 +475,7 @@ function record<T = eventWithTime>(
           keepIframeSrcFn,
           blockSelector,
           slimDOMOptions,
+          dataURLOptions,
           mirror,
           iframeManager,
           stylesheetManager,

packages/rrweb/src/record/mutation.ts

@@ -169,6 +169,7 @@ export default class MutationBuffer {
   private recordCanvas: observerParam['recordCanvas'];
   private inlineImages: observerParam['inlineImages'];
   private slimDOMOptions: observerParam['slimDOMOptions'];
+  private dataURLOptions: observerParam['dataURLOptions'];
   private doc: observerParam['doc'];
   private mirror: observerParam['mirror'];
   private iframeManager: observerParam['iframeManager'];
@@ -191,6 +192,7 @@ export default class MutationBuffer {
       'recordCanvas',
       'inlineImages',
       'slimDOMOptions',
+      'dataURLOptions',
       'doc',
       'mirror',
       'iframeManager',
@@ -301,6 +303,7 @@ export default class MutationBuffer {
         maskTextFn: this.maskTextFn,
         maskInputFn: this.maskInputFn,
         slimDOMOptions: this.slimDOMOptions,
+        dataURLOptions: this.dataURLOptions,
         recordCanvas: this.recordCanvas,
         inlineImages: this.inlineImages,
         onSerialize: (currentN) => {

packages/rrweb/src/record/observers/canvas/canvas-manager.ts

@@ -1,4 +1,4 @@
-import type { ICanvas, Mirror } from 'rrweb-snapshot';
+import type { ICanvas, Mirror, DataURLOptions } from 'rrweb-snapshot';
 import type {
   blockClass,
   canvasManagerMutationCallback,
@@ -63,21 +63,25 @@ export class CanvasManager {
     blockSelector: string | null;
     mirror: Mirror;
     sampling?: 'all' | number;
+    dataURLOptions: DataURLOptions;
   }) {
     const {
       sampling = 'all',
       win,
       blockClass,
       blockSelector,
       recordCanvas,
+      dataURLOptions,
     } = options;
     this.mutationCb = options.mutationCb;
     this.mirror = options.mirror;
 
     if (recordCanvas && sampling === 'all')
       this.initCanvasMutationObserver(win, blockClass, blockSelector);
     if (recordCanvas && typeof sampling === 'number')
-      this.initCanvasFPSObserver(sampling, win, blockClass, blockSelector);
+      this.initCanvasFPSObserver(sampling, win, blockClass, blockSelector, {
+        dataURLOptions,
+      });
   }
 
   private processMutation: canvasManagerMutationCallback = (
@@ -102,6 +106,9 @@ export class CanvasManager {
     win: IWindow,
     blockClass: blockClass,
     blockSelector: string | null,
+    options: {
+      dataURLOptions: DataURLOptions;
+    },
   ) {
     const canvasContextReset = initCanvasContextObserver(
       win,
@@ -202,6 +209,7 @@ export class CanvasManager {
               bitmap,
               width: canvas.width,
               height: canvas.height,
+              dataURLOptions: options.dataURLOptions,
             },
             [bitmap],
           );

packages/rrweb/src/record/workers/image-bitmap-data-url-worker.ts

@@ -1,4 +1,5 @@
 import { encode } from 'base64-arraybuffer';
+import type { DataURLOptions } from 'rrweb-snapshot';
 import type {
   ImageBitmapDataURLWorkerParams,
   ImageBitmapDataURLWorkerResponse,
@@ -25,12 +26,13 @@ interface ImageBitmapDataURLResponseWorker {
 async function getTransparentBlobFor(
   width: number,
   height: number,
+  dataURLOptions: DataURLOptions,
 ): Promise<string> {
   const id = `${width}-${height}`;
   if (transparentBlobMap.has(id)) return transparentBlobMap.get(id)!;
   const offscreen = new OffscreenCanvas(width, height);
   offscreen.getContext('2d'); // creates rendering context for `converToBlob`
-  const blob = await offscreen.convertToBlob(); // takes a while
+  const blob = await offscreen.convertToBlob(dataURLOptions); // takes a while
   const arrayBuffer = await blob.arrayBuffer();
   const base64 = encode(arrayBuffer); // cpu intensive
   transparentBlobMap.set(id, base64);
@@ -45,16 +47,20 @@ worker.onmessage = async function (e) {
   if (!('OffscreenCanvas' in globalThis))
     return worker.postMessage({ id: e.data.id });
 
-  const { id, bitmap, width, height } = e.data;
+  const { id, bitmap, width, height, dataURLOptions } = e.data;
 
-  const transparentBase64 = getTransparentBlobFor(width, height);
+  const transparentBase64 = getTransparentBlobFor(
+    width,
+    height,
+    dataURLOptions,
+  );
 
   const offscreen = new OffscreenCanvas(width, height);
   const ctx = offscreen.getContext('2d')!;
 
   ctx.drawImage(bitmap, 0, 0);
   bitmap.close();
-  const blob = await offscreen.convertToBlob(); // takes a while
+  const blob = await offscreen.convertToBlob(dataURLOptions); // takes a while
   const type = blob.type;
   const arrayBuffer = await blob.arrayBuffer();
   const base64 = encode(arrayBuffer); // cpu intensive

packages/rrweb/src/types.ts

@@ -6,6 +6,7 @@ import type {
   SlimDOMOptions,
   MaskInputFn,
   MaskTextFn,
+  DataURLOptions,
 } from 'rrweb-snapshot';
 import type { PackFn, UnpackFn } from './packer/base';
 import type { IframeManager } from './record/iframe-manager';
@@ -251,6 +252,7 @@ export type recordOptions<T> = {
   hooks?: hooksParam;
   packFn?: PackFn;
   sampling?: SamplingStrategy;
+  dataURLOptions?: DataURLOptions;
   recordCanvas?: boolean;
   userTriggeredOnInput?: boolean;
   collectFonts?: boolean;
@@ -290,6 +292,7 @@ export type observerParam = {
   userTriggeredOnInput: boolean;
   collectFonts: boolean;
   slimDOMOptions: SlimDOMOptions;
+  dataURLOptions: DataURLOptions;
   doc: Document;
   mirror: Mirror;
   iframeManager: IframeManager;
@@ -323,6 +326,7 @@ export type MutationBufferParam = Pick<
   | 'recordCanvas'
   | 'inlineImages'
   | 'slimDOMOptions'
+  | 'dataURLOptions'
   | 'doc'
   | 'mirror'
   | 'iframeManager'
@@ -563,6 +567,7 @@ export type ImageBitmapDataURLWorkerParams = {
   bitmap: ImageBitmap;
   width: number;
   height: number;
+  dataURLOptions: DataURLOptions;
 };
 
 export type ImageBitmapDataURLWorkerResponse =