WindowContentColorspace (primaries x transfer) + set_content_colorspace:
Wayland rebuilds the color-management-v1 image description per spec
(P3/BT.2020 primaries, PQ/HLG transfer with luminances), macOS tags the
Metal layer with the matching CGColorSpace (incl. BT.2100 PQ/HLG),
Windows records it (ACM only honors sRGB). Also: warn when the wgpu
surface fallback would pick an sRGB-suffixed format (double encoding),
share the surface-params uniform across 256 slots (multiple viewers per
frame), and cfg-gate the viewer's GPU-texture source for macOS/Windows.
Mike-Solar
41dac8f33e