在Safari上的createImageBitmap替代 [英] createImageBitmap alternative on Safari

问题描述

我想用web worker上运行的一些asm.js代码生成图像。我想定期将这种计算的最新状态与其他一些内容一起合成到用户可见的二维画布上。目前我的代码是

I'd like to generate images in a bit of asm.js code running on a web worker. And I'd like to regularly composite the latest state of that computation onto a user-visible 2d canvas, together with some other content. Currently I have code which

1. 构建了一个 ImageData 使用它的构造函数，基于asm.js代码使用的数组缓冲区的一部分，


2. 调用 createImageBitmap 将 ImageData 转换为 ImageBitmap ，


3. 将图像位图从工作人员传输到GUI线程和


4. 使用 ImageBitmap 作为 CanvasRenderingContext2D.drawImage 。

1. constructs an ImageData object using its constructor, based on a portion of the array buffer used by the asm.js code,
2. calls createImageBitmap to turn the ImageData into an ImageBitmap,
3. transfers that image bitmap from the worker to the GUI thread and
4. uses that ImageBitmap as an argument to CanvasRenderingContext2D.drawImage.

事情在最近的Chrome和Firefox中运行良好，但Safari 9.1.3显然没有 createImageBitmap 函数。 我如何以一种适用于Safari的方式进行上述操作？

Things work nicely in recent Chrome and Firefox, but Safari 9.1.3 apparently has no createImageBitmap function. How would I do something like the above in a way that works on Safari?

是否有一些图像的低成本编码，为它创建一个 data：image / png ... ？有没有其他方法可以将一个字节数组转换为可以馈送给 drawImage ？

Is there some low-cost encoding of images, short of creating a data:image/png… for it? Is there some other way to turn a byte array into something you can feed to drawImage?

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