Hi all,
A long outstanding issue with the DRM subsystem has been the lack of
support for low-color displays, as used typically on older desktop
systems, and on small embedded displays.
This patch series adds support for color-indexed frame buffer formats
with 2, 4, and 16 colors. It has been tested on ARAnyM using a
work-in-progress Atari DRM driver.
Changes compared to v3[1]:
- Rename util_smpte_index_gamma() to util_smpte_fill_lut(), and its
first parameter from size to ncolors,
- Move smpte_color_lut[] down,
- Kill FILL_COLOR() macro,
- Add and use EXPAND_COLOR() macro,
- Replace FILL_COLOR() use by bw_color_lut[],
- Replace FILL_COLOR() use by pentile_color_lut[],
- Add missing C[12] to oneline-summary,
- Do not remove memset() of full lut, else some entries may stay
uninitialized.
Changes compared to v2[2]:
- Add Acked-by,
- Add Wikipedia link,
- Dropped "[RFC] drm_fourcc: Add DRM_FORMAT_C[124]", as these were
added in commit 329eebcf32793361 ("drm_fourcc: sync drm_fourcc with
latest drm-next kernel") in libdrm-2.4.115.
Changes compared to v1[3]:
- SMPTE color LUT accuracy,
- Factor out smpte color LUT,
- Restructure patches,
- Improve descriptions.
- Store number of colors for indexed formats,
- Add SMPTE pattern support for the C1 and C2 formats.
I have also updated the merge request at [4].
Thanks for your comments!
[1] https://lore.kernel.org/r/cover.1690537375.git.geert@xxxxxxxxxxxxxx
[2] https://lore.kernel.org/r/cover.1657302034.git.geert@xxxxxxxxxxxxxx/
[3] https://lore.kernel.org/r/cover.1646683737.git.geert@xxxxxxxxxxxxxx/
[4] https://gitlab.freedesktop.org/mesa/drm/-/merge_requests/314
Geert Uytterhoeven (9):
util: improve SMPTE color LUT accuracy
util: factor out and optimize C8 SMPTE color LUT
util: add support for DRM_FORMAT_C[124]
util: store number of colors for indexed formats
util: add SMPTE pattern support for C4 format
util: add SMPTE pattern support for C1 format
util: add SMPTE pattern support for C2 format
modetest: add support for DRM_FORMAT_C[124]
modetest: add SMPTE pattern support for C[124] formats
tests/modetest/buffers.c | 15 ++
tests/modetest/modetest.c | 9 +-
tests/util/format.c | 5 +-
tests/util/format.h | 1 +
tests/util/pattern.c | 430 ++++++++++++++++++++++++++++++++++----
tests/util/pattern.h | 2 +-
6 files changed, 415 insertions(+), 47 deletions(-)
--
2.34.1
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
