Below ICON_MIN_CELL_PX (42px cell width) everything still draws as the
plain colored dot it always has, a game icon at that size would just
be an illegible smudge. Past that threshold, Nest/Target/Ally markers
switch to the game's own unit icon for their type, drawn as a Cairo
surface (raw Cairo draw_func, not GTK widgets, so this loads PNGs
directly via cairo.ImageSurface.create_from_png(), cached per path so
a repeat draw doesn't re-hit disk).
icons.py's target_icon_path(type, is_ally) is the TargetType -> icon
file mapping, best-effort guesses the same way the Shell descriptions
were (flagged for correction): most types map onto the game's own
Enemy_*/Friendly_* unit icons (is_ally picks which set, falling back
to Enemy_ if a given type has no Friendly_ counterpart), TANK reuses
the Armor_Mechanized artwork (no dedicated tank icon exists), and
STRIKE gets its own crosshair (assets/icons/misc/Crosshair.png, not a
unit icon at all, a planned impact point) rather than a unit icon.
An ambiguous candidate (hollow, dashed-ring marker) never switches to
the icon regardless of zoom, an icon there would look more confident
about an unconfirmed position than the dashed ring is supposed to
convey.
Verified with rendered screenshots at both zoom levels: plain dots
below the threshold, real icons above it (Tank/Infantry/MarineGarrison/
Nest all confirmed showing their correct icons), and the Strike
crosshair specifically.
Dominik Roth
e352dff531