Hm, could this be related to e10s? I remember we had to do some work to make the devtools screenshot command e10s-compatible. Now it runs in the content process, whereas before it would run in the parent process. Trying to take a screenshot from the parent process with e10s enabled would end up with an white canvas. In fact, if you open the dev toolbar (shift-F2) and type in 'screenshot --chrome', this will take a screenshot of the whole browser window, and you'll see that the content area is just a white rectangle if you have e10s enabled.
On Wed, Jan 20, 2016 at 10:50 AM, <m.bauermeis...@sto.com> wrote: > I'm not sure what exactly I'm doing wrong but neither drawWindow, nor > asyncDrawXULElement seem to work for me. Not even for screenshots of the > whole window. > > "Borrowing" from capture.js/screenshot.js also made me none the wiser. > > Is there something wrong with how I'm trying to copy the contents of the > window to the canvas? > > > <?xml version="1.0"?> > <?xml-stylesheet href="chrome://global/skin/" type="text/css"?> > <window xmlns=" > http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"; > xmlns:html="http://www.w3.org/1999/xhtml"; id="window"> > > <button>Test</button> > > <html:canvas id="canvas" width="1024" height="768"> > </html:canvas> > > <script> > > var canvas = document.getElementById("canvas"); > var ctx = canvas.getContext("2d"); > ctx.drawWindow(window, 0, 0, 1024, 768, "rgba(255,255,255,1)"); > </script> > </window> > _______________________________________________ > dev-platform mailing list > dev-platform@lists.mozilla.org > https://lists.mozilla.org/listinfo/dev-platform > _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
