drm/format-helper: Add drm_fb_xrgb8888_to_mono_reversed()

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Add support to convert from XR24 to reversed monochrome for drivers that
control monochromatic display panels, that only have 1 bit per pixel.

The function does a line-by-line conversion doing an intermediate step
first from XR24 to 8-bit grayscale and then to reversed monochrome.

The drm_fb_gray8_to_mono_reversed_line() helper was based on code from
drivers/gpu/drm/tiny/repaper.c driver.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20220214133710.3278506-3-javierm@redhat.com

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Javier Martinez Canillas 2022-02-14 14:37:06 +01:00

parent 4a564e59bf

commit bcf8b616de

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GPG key ID: C751E590D63F3D69

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110

drivers/gpu/drm/drm_format_helper.c

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4

include/drm/drm_format_helper.h

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