Hi Trevor, On 11/05/2014 21:34, Trevor Linton wrote: > I’ve been in the process of porting webkit (just webcore) to javascript with > emscripten. I have the code compiling and successfully running with cairo, > freetype2, egl/opengles v2/sdl as font/rendering backends. In addition > accelerated compositing and a host of other platform features as needed for > the use. > > The issue i’m running into has to do with transparency, gradients and any > rgba color values where the alpha is anything other than 1. If I use any > CSS/HTML inputs that need gradients or alpha > 0 including drop shadows they > will not render. I’ve traced that the values are successfully getting to the > GraphicsContext and down into cairo. This happens regardless if i’m using a > hardware accelerated path or software only. > > I’m curious if there’s any suggestions or tips that may help track down this > issue as i’m pretty stumped as to what the issue is. My best guess is the > cairo/egl context isn’t setup correctly and calls to cairo that require > compositing with an alpha value blend are not being honored. > > Tips? Suggestions? You can view the code here: > > http://github.com/trevorlinton/webkit.js I don't think the people who can help you are subscribed on webkit-help.
You should try asking the question on webkit-gtk. WebKit-GTK has a configuration similar to yours (Linux + Cairo), they might be able to help. I am not familiar with Cairo but...the next thing I would check for your bug is the backbuffer of the rendering surface you create. You may be rendering on a surface type that does not support alpha. Benjamin _______________________________________________ webkit-help mailing list webkit-help@lists.webkit.org https://lists.webkit.org/mailman/listinfo/webkit-help
