send custom device-pixel-ratio?

[kylerove]

It would be nice to have an option to send a device-pixel-ratio other than 1 (to target retina-scale graphics on compatible sites).

[paulhammond]

I just took a quick look at the docs, and there's no obvious way to do this. The backing scale stuff happens at a pretty low level in WebKit and Cocoa - it's not just a case of supplying a scale factor when initializing the web view. That doesn't mean it's impossible, but it's not going to be easy, and I don't know when I'm going to get to it. If someone else can work out how to do it I'd love to merge their code though!

[kylerove]

Thats too bad it's so low-level because manipulating it would make it easier to capture retina screenshots on non-retina displays.
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On Thu, Apr 4, 2013 at 12:21 PM, Paul Hammond notifications@github.com
wrote:

I just took a quick look at the docs, and there's no obvious way to do this. The backing scale stuff happens at a pretty low level in WebKit and Cocoa - it's not just a case of supplying a scale factor when initializing the web view. That doesn't mean it's impossible, but it's not going to be easy, and I don't know when I'm going to get to it. If someone else can work out how to do it I'd love to merge their code though!

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#38 (comment)

[stefanneubig]

I saw that with phantomJS you simply do this CSS magic to get screenshots with retina resolution. Would this be an idea for webkit2png also?

document.body.style.webkitTransform = "scale(2)";
document.body.style.webkitTransformOrigin = "0% 0%";
/* fix the body width that overflows out of the viewport */
document.body.style.width = "50%";