[libdrm,v3,0/9] util, modetest: Add support for low-color frame buffer formats

Message

Geert Uytterhoeven July 28, 2023, 9:52 a.m. UTC

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 v2[1]:
  - 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[2]:
  - 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 opened a merge request at [3].

Thanks for your comments!

[1] https://lore.kernel.org/r/[e-mail]/
[2] https://lore.kernel.org/r/[e-mail]/
[3] 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 C4 format

 tests/modetest/buffers.c  |  15 ++
 tests/modetest/modetest.c |   9 +-
 tests/util/format.c       |   5 +-
 tests/util/format.h       |   1 +
 tests/util/pattern.c      | 416 ++++++++++++++++++++++++++++++++++----
 tests/util/pattern.h      |   2 +-
 6 files changed, 405 insertions(+), 43 deletions(-)