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Bug 643726 - net-libs/webkit-gtk-2.18.4 should match opengl/gles2 USE flag with x11-libs/cairo
Summary: net-libs/webkit-gtk-2.18.4 should match opengl/gles2 USE flag with x11-libs/c...
Alias: None
Product: Gentoo Linux
Classification: Unclassified
Component: Current packages (show other bugs)
Hardware: All Linux
: Normal normal (vote)
Assignee: Gentoo Linux Gnome Desktop Team
Depends on:
Reported: 2018-01-06 17:49 UTC by Cedric Sodhi
Modified: 2018-07-23 22:30 UTC (History)
1 user (show)

See Also:
Package list:
Runtime testing required: ---


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Description Cedric Sodhi 2018-01-06 17:49:51 UTC
For those installs using (depending on the exact definition of those flags, but generally) USE="+gles2 -opengl" (i.e. only GL ES, not full GL), webkit-gtk should not try to pull in cairo[opengl] due to webgl, but should be satisfied by cairo[gles2] or cairo[opengl], possibly depending on the choice of USE flags in webkit-gtk.
Comment 1 Mart Raudsepp gentoo-dev 2018-01-25 14:35:34 UTC
Tried to change webgl cairo dep to cairo[opengl?,gles2?] but repoman put a wrench in it, as cairo[gles2] seems use masked. Feel free to help investigating why that is. I can't make the changes in webkit-gtk without use.masking things too, as it stands.
Additionally gst-plugins-bad[opengl] stuff probably would need the same treatment, and I'm not sure what the story is for non-webgl opengl usages (there's no cairo[gles2] dep for USE=gles2, though a cairo_gl_surface_create seems required, which could come from either cairo[gles2] or cairo[opengl]).
Comment 2 Pacho Ramos gentoo-dev 2018-01-25 17:05:34 UTC
The gles2 use masking looks to be caused by cairo gl and gles2 being mutually exclusive:
Comment 3 Larry the Git Cow gentoo-dev 2018-07-23 22:30:05 UTC
The bug has been closed via the following commit(s):

commit 73d95b14d48bc96582f3dca2029ffdf790d1aafd
Author:     Mart Raudsepp <>
AuthorDate: 2018-07-23 09:36:00 +0000
Commit:     Mart Raudsepp <>
CommitDate: 2018-07-23 22:23:43 +0000

    net-libs/webkit-gtk-2.20.3: disable experimental accelerated 2D canvas
    ACCELERATED_2D_CANVAS is considered experimental by upstream. I'm not sure
    what the justification was for enabling it with USE="webgl opengl" for us.
    The only reason this code isn't removed fully from upstream is because it
    _MIGHT_ be useful for some embedded use cases, yet it doesn't work with
    GLES2 yet, only desktop opengl.
    Additionally, for us this is causing additional cairo[opengl] dependency
    that can't be avoided for just non-experimental WebGL support via desktop
    GL as it was setup before in ebuild. No-one but Gentoo is building with
    this experimental option (not even upstream developers), and any issues
    about it won't really be cared about.
    Disable it and drop the cairo[opengl] dependency.
    If this is ever added back for any reason, make sure cairo[opengl] isn't
    depended on when not necessary (when accelerated 2d canvas is disabled,
    e.g. previously USE="opengl gles2" pulled in cairo[opengl] still, albeit
    that combination was not allowed previously, but a future webkit-gtk
    upstream version may support them together) and review if cairo-glesv2
    is supported (and so it'd be supported with USE=gles2 too, unlike now).
    Package-Manager: Portage-2.3.43, Repoman-2.3.10

 net-libs/webkit-gtk/webkit-gtk-2.20.3.ebuild | 16 ++--------------
 1 file changed, 2 insertions(+), 14 deletions(-)