2003863 - createImageBitmap gives unhelpful/incorrect error messages

Status: NEW

(Core :: Graphics: Canvas2D, defect)

Description

[Jake Archibald [:jakea]]

createImageBitmap(new Blob(['YO']));

• Firefox: DOMException: An attempt was made to use an object that is not, or is no longer, usable
• Chrome: InvalidStateError: The source image could not be decoded.
• Safari: InvalidStateError: Cannot decode the data in the argument to createImageBitmap

Firefox's error seems unhelpful/incorrect.

Comment 1

[Timothy Nikkel (:tnikkel)]

Is there other cases where it gives unhelpful error messages that you encountered that seem distinct from this? If there is more, might be good to list them.

Comment 2

[Jake Archibald [:jakea]]

Here's a test https://random-stuff.jakearchibald.com/bug-repros/createimagebitmap-errors/ (see the console) - it's not completely exhaustive, but pretty detailed.

• "Invalid SVG <img>" should error with something like "The SVG image is invalid"
• "Zero width SVG blob" should error with something like "The SVG image must have nozero width"
• "Zero height SVG blob" should error with something like "The SVG image must have nozero height"
• "Zero width and height SVG blob" should error with either of the above, or both
• "Image hasn't loaded yet" should error with "Image is not completely available"
• "<canvas> with zero width" should error with something like "The <canvas> must have a nonzero width"
• "<canvas> with zero height" should error with something like "The <canvas> must have a nonzero height"
• As one of the above for the width + height 0 case, or both
• "Detached ImageBitmap" should error with something like "The ImageBitmap is detached (closed/transferred)"
• "SVG blob without natural dimensions and no resizeWidth/resizeHeight" should error with something like "The SVG image lacks natural dimensions"
• "Invalid image data" should error with something like "The image could not be decoded"