ImageBitmapRenderingContext

这是一个实验中的功能
此功能某些浏览器尚在开发中，请参考浏览器兼容性表格以得到在不同浏览器中适合使用的前缀。由于该功能对应的标准文档可能被重新修订，所以在未来版本的浏览器中该功能的语法和行为可能随之改变。

ImageBitmapRenderingContext 接口是 canvas 的渲染上下文，它只提供了使用给定 ImageBitmap 替换 canvas 的功能。它的上下文 ID (HTMLCanvasElement.getContext() 或 OffscreenCanvas.getContext() 的第一个参数) 是 "bitmaprenderer"。

这个接口可用于 window context 和 worker context.

方法

ImageBitmapRenderingContext.transferFromImageBitmap(): 在与此渲染上下文相关的 canvas 中显示给定的 ImageBitmap 。 ImageBitmap 的所有权被转移到画布上。这个函数以前命名为transferImageBitmap()，但在规范中修改了原名字。为了避免影响之前的代码，旧名称作为别名被保留下来。

Currently drafted as a proposal in the OffscreenCanvas specification.

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
Basic support ExperimentalNon-standard	Chrome Full support 66	Edge ?	Firefox Full support 46	IE No support No	Opera ?	Safari No support No	WebView Android Full support 66	Chrome Android Full support 66	Edge Mobile ?	Firefox Android Full support 46	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No
`transferFromImageBitmap` ExperimentalNon-standard	Chrome Full support 66	Edge ?	Firefox Full support 52 Full support 52 No support 46 — 52 Alternate Name Alternate Name Uses the non-standard name: `transferImageBitmap`	IE No support No	Opera ?	Safari No support No	WebView Android Full support 66	Chrome Android Full support 66	Edge Mobile ?	Firefox Android Full support 52 Full support 52 No support 46 — 52 Alternate Name Alternate Name Uses the non-standard name: `transferImageBitmap`	Opera Android ?	Safari iOS ?	Samsung Internet Android No support No

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown
Experimental. Expect behavior to change in the future.: Experimental. Expect behavior to change in the future.
Non-standard. Expect poor cross-browser support.: Non-standard. Expect poor cross-browser support.
Uses a non-standard name.: Uses a non-standard name.