Handle unknown background formats gracefully #174
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The dimensions of the background image are used as a default window size if the specification does not contain a `window.size` object. Skipping this is useful because reading the background image's dimensions won't work if it's in a format that `image-size` doesn't understand, particularly PDF.
When reading the background image's dimensions fails, appdmg now tells the user that the error can be avoided by giving `window.size` in the JSON specification.
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It would also be useful to update the readme to mention that PDF is supported as background. Here:
And here: |
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One of the image formats supported by Finder for the background image is, somewhat surprisingly, PDF. That's a vector graphics format, so this could be used to make a single background image that scales cleanly to any screen resolution, without having to make a separate
@2xversion of the image.Problem: appdmg chokes when trying to use a PDF as the background image, because
image-sizedoesn't understand that format (and PDF doesn't have a pixel size anyway).This PR does two things to help with that problem:
image-sizeif awindow.sizeis given in the JSON specification file.image-sizefails, give a helpful error message that explains what actually happened (couldn't read the image size) and how to avoid it (by giving awindow.size).