https://bugs.kde.org/show_bug.cgi?id=502682
Bug ID: 502682
Summary: Compatibility with GTK symbolic icons (GTK icon
recolorization)
Classification: Frameworks and Libraries
Product: frameworks-kiconthemes
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: wishlist
Priority: NOR
Component: general
Assignee: cf...@kde.org
Reporter: fedin-ilja2...@ya.ru
CC: kdelibs-b...@kde.org
Target Milestone: ---
SUMMARY
Being compatible with GTK's icon recolorization could made icon themes made
primarily for GTK desktop environments way more usable in KDE. GTK also allows
icons provided by applications to be recolored unlike KDE's way (since
kiconthemes requires FollowColorScheme=true in index.theme which hicolor
doesn't have) so various icons provided by applications could render better
with this, too.
GTK uses `-symbolic` icon name ending as a sign the icon has to be recolored.
By default, it recolors all elements with text color but if the element has one
of the following classes:
* error
* warning
* success
They are recolored into the following colors accordingly:
* red
* orange
* green
The exact default values are:
https://gitlab.gnome.org/GNOME/gtk/-/blob/a6792b83e33a4e2bc3143dd626b345f5c27d858c/gtk/gtkicontheme.c#L3862-3865
It seem to be themable using GTK themes though:
https://gitlab.gnome.org/GNOME/gtk/-/blob/a6792b83e33a4e2bc3143dd626b345f5c27d858c/gtk/gtkcssstyle.c#L871
Here's how the classes are injected into SVG:
https://gitlab.gnome.org/GNOME/gtk/-/blob/a6792b83e33a4e2bc3143dd626b345f5c27d858c/gtk/gdktextureutils.c#L208
They also seem to support recoloring PNG but not sure how much that's relevant
for kiconthemes:
https://gitlab.gnome.org/GNOME/gtk/-/blob/a6792b83e33a4e2bc3143dd626b345f5c27d858c/gtk/gtkicontheme.c#L2117
As a starting point, this could be enabled only when KDE's icon recolorization
is not enabled, i.e. when the icon theme's index.theme doesn't have
FollowsColorScheme=true
STEPS TO REPRODUCE
1. Use an icon theme made for GTK DEs or an application providing a symbolic
icon made for GTK
OBSERVED RESULT
Icons are recolored as in GTK DEs
EXPECTED RESULT
Icons aren't recolored and look broken
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