1316420 - ImageBitmapRenderingContext tests failure

Status: UNCONFIRMED

(Core :: Graphics: Canvas2D, defect, P3)

Description

[xidachen]

User Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.90 Safari/537.36

Steps to reproduce:

When up-streaming some ImageBitmapRenderingContext tests to web-platform-tests, I found that two test cases failed on Firefox.
1. Calling transferFromImageBitmap(null);
2. Suppose we have a canvas and we got its ImageBitmapRenderingContext "ctx", calling ctx.canvas should give the original canvas.

Github pull request here:
https://github.com/w3c/web-platform-tests/pull/4167


Actual results:

1. Calling transferFromImageBitmap(null) gives this error:
Argument 1 of ImageBitmapRenderingContext.transferFromImageBitmap is not an object.

2. Calling ctx.canvas gives undefined.


Expected results:

Already described in the above.

Comment 1

[xidachen]

Another test case failure, which is in the bitmaprenderer-as-imagesource.html in the above pull request,

suppose we have a canvas with size 20*20, we get its bitmap rendering context ctx, and call ctx.transferFromImageBitmap(image) and the image is 10*10, when we do createImageBitmap(canvas), the resulting ImageBitmap should be 10*10.