QET had no icon theme: the 446 entries of the icon table and the 116
iconsets in .ui files each named a resource path, so an icon could only
ever be one file, and a variant for another palette or a vector source
had nowhere to go (GitHub #466, #690, #870). This adds the theme layout
without changing a single pixel; a dark variant comes in a follow-up.
The theme "qet" follows the freedesktop layout Qt's icon loader
understands. misc/make_icon_themes.py generates ico/icon-themes.qrc,
which aliases the existing ico/<size>/<name>.png files into
themes/qet/<size>/<name>.png, and ico/themes/qet/index.theme. No file
moves. The four table entries that paired a 16 pixel file with a 22
pixel file of another name (ConductorSettings, DiagramAdd,
DiagramDelete, DialogInformation) get the 22 pixel file aliased under
the 16 pixel name.
QETApp::initIconTheme() registers the theme before initIcons() and makes
it current on every platform, so a desktop icon theme cannot replace
QET's icons. Icons are then looked up by name: QIcon::fromTheme() in
qeticons.cpp and in the few places that built a QIcon from a resource
path directly, and theme="..." on the iconsets in .ui files, with the
resource path kept as fallback. Flags, color swatches, application and
MIME icons stay on their paths.
One entry does not go through the theme. The elements panel draws the
project root with ProjectFileGP in the 50 pixel slot it reserves for
element previews, and the name "project" also carries the 128 pixel
file the configuration dialog uses. On a 2x display Qt's loader picks
that file for a 50 pixel request and fills the slot. ProjectFileGP
loads the 16 and 22 pixel files directly, as before.
tests/qttest/tst_qeticons: every name in the theme resolves, the four
aliases resolve at 22 pixels, a Fusion tool button shows its icon at
3:1 with disabled weaker than enabled, and the project root icon stays
at 22 pixels or less when asked for 50 at 2x while the configuration
dialog still gets its 128 pixel file. The rendering helpers shared
with tst_qetpalette moved to tests/qttest/inkcontrast.h.
Jeff Patterson