https://gitlab.synchro.net/main/sbbs/-/commit/ed96e305648879fab20f557c
Added Files:
src/doors/syncscumm/test/test_termgfx_present_rgbx.c unit_termgfx_present_rgbx.sh
Log Message:
syncscumm: unit-test the truecolor present_rgbx path

Task 4 of the termgfx truecolor present plan: a headless test for termgfx_termio_present_rgbx(), the 32-bit XRGB present path Task 3
added. Drives it via the existing SYNCSCUMM_SIXELOUT capture mode (no
tty needed) with a 64x48 frame -- deliberately not 320x200, to
exercise the w/h-parameterized geometry present_rgbx() takes -- and
decodes the captured sixel's palette registers.

Three assertions: a solid-color frame's register matches the source
RGB on the sixel encoder's 0-100 scale (proving the R,G,B,X byte
order and the quantize/encode path); a two-color frame yields both
colors as distinct registers (proving the quantizer sees distinct
colors); and re-running the solid frame with per-pixel garbage in the
X byte produces byte-identical output to the X=255 run (proving the
pad byte is dropped, not just untested).

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