Add support for Chromium viewport configuration for screenshots

[gg-gaborginter]

Add support for Chromium viewport configuration for screenshots

[gulien]

Hey @gg-gaborginter,

I was playing with viewportWidth and viewportHeight, and I was not able to make them work.
For instance, increasing the value of viewportWidth did not make the website CSS "adapt", but instead it kept the same width (e.g., website sticked to the left of the screenshot) while capturing more "background". viewportHeight was working OK, meaning I was able to take screenshots of a portion of the site.

Also, keep in mind that screenshots are not a first class citizen in Gotenberg, but merely a tool to make a sort of "preview" of the PDF conversion result.

[gg-gaborginter]

Hi @gulien,

We are at the moment using a self-built, similar setup for both purposes: PDF and screenshot generation. With screenshots, as the window size can't be influenced anyhow else on the Chromium API, we set the viewport sizes instead and restricted the width of the page body through CSS.

I made some tests with the HTML viewport meta tag, by fixing the width and height explicitly, but without the viewport setting on the Chromium page instance, the screenshot was made of the whole window size (lots of white space all around the desired content).

I understand that the screenshot feature is not a first-class citizen. It would be nice, though, to have the option to control some of the settings that Chromium offers. I'm willing to contribute, so I created a pull request, as well: #787

[stale]

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