A single DXGI cursor shape can need BOTH an alpha-blended layer AND a
screen-inverting (XOR) layer at once — a masked-color text I-beam (opaque
hot-spot + inverting bar) or a monochrome cursor mixing opaque and invert
pixels. The old path produced ONE BGRA image per shape and picked ONE blend
(cursor_invert) for the whole shape, so such mixed cursors rendered wrong
(masked-color opaque pixels forced through the invert blend; monochrome
(AND=1,XOR=1) invert pixels approximated as solid black).
Port Apollo/Sunshine's decomposition: convert_pointer_shape now returns a
CursorShape with optional alpha/xor layers; CursorCompositor holds tex_alpha
+ tex_xor and draw_layer renders each with its own blend (alpha = src-over,
HDR-scaled; XOR = inversion, unscaled — it operates on the framebuffer
reference). The CPU software path blends both layers too. Empty layers are
never uploaded or drawn. Removes the single cursor_invert flag.
Fixes#13 in docs/apollo-comparison.md. Independently reviewed (ship);
Windows-only code — compile verified by CI / dev VM.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
enricobuehler
6d7301ccf5