From: Javier Martinez Canillas <javierm@redhat.com>
To: Thomas Zimmermann <tzimmermann@suse.de>
Cc: dri-devel@lists.freedesktop.org, Thomas Zimmermann <tzimmermann@suse.de>
Subject: Re: [PATCH 9/9] drm/vesadrm: Support DRM_FORMAT_C8
Date: Fri, 11 Jul 2025 14:33:15 +0200 [thread overview]
Message-ID: <87ecumewl0.fsf@minerva.mail-host-address-is-not-set> (raw)
In-Reply-To: <20250617143649.143967-10-tzimmermann@suse.de>
Thomas Zimmermann <tzimmermann@suse.de> writes:
> Add support for DRM_FORMAT_C8 to vesadrm. The new pixel-format
> description PIXEL_FORMAT_C8 describes the layout. Vesadrm's helpers
> vesadrm_fill_palette_lut() and vesadrm_load_palette_lut() set the
> hardware palette according to the CRTC's output format.
>
> The driver emulates XRGB8888 by converting the source buffer to
> RGB332 and using the resulting 256 colors as index into the hardware
> palette. The hardware palette converts back to RGB during scanout.
> This has no overhead compared to other format conversion, but allows
> common userspace, such as Wayland compositors, to operate on the
> display.
>
> Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
> ---
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
--
Best regards,
Javier Martinez Canillas
Core Platforms
Red Hat
prev parent reply other threads:[~2025-07-11 12:37 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-17 14:23 [PATCH 0/9] drm/vesadrm: Support 8-bit palettes Thomas Zimmermann
2025-06-17 14:23 ` [PATCH 1/9] video: pixel_format: Add compare helpers Thomas Zimmermann
2025-07-11 11:55 ` Javier Martinez Canillas
2025-06-17 14:23 ` [PATCH 2/9] video: screen_info: Add pixel-format helper for linear framebuffers Thomas Zimmermann
2025-07-11 11:58 ` Javier Martinez Canillas
2025-06-17 14:23 ` [PATCH 3/9] drm/sysfb: Find screen_info format with helpers Thomas Zimmermann
2025-07-11 12:08 ` Javier Martinez Canillas
2025-06-17 14:23 ` [PATCH 4/9] drm/sysfb: Blit to CRTC destination format Thomas Zimmermann
2025-07-11 12:10 ` Javier Martinez Canillas
2025-06-17 14:23 ` [PATCH 5/9] drm/color-mgmt: Prepare for RGB332 palettes Thomas Zimmermann
2025-07-11 12:24 ` Javier Martinez Canillas
2025-07-11 12:30 ` Thomas Zimmermann
2025-07-14 7:13 ` Thomas Zimmermann
2025-06-17 14:23 ` [PATCH 6/9] drm/format-helper: Add XRGB8888-to-RGB332 to drm_fb_blit() Thomas Zimmermann
2025-07-11 12:25 ` Javier Martinez Canillas
2025-06-17 14:23 ` [PATCH 7/9] drm/vesadrm: Rename vesadrm_set_gamma_lut() to vesadrm_set_color_lut() Thomas Zimmermann
2025-07-11 12:25 ` Javier Martinez Canillas
2025-06-17 14:23 ` [PATCH 8/9] drm/vesadrm: Prepare color management for palette-based framebuffers Thomas Zimmermann
2025-07-11 12:26 ` Javier Martinez Canillas
2025-06-17 14:23 ` [PATCH 9/9] drm/vesadrm: Support DRM_FORMAT_C8 Thomas Zimmermann
2025-07-11 12:33 ` Javier Martinez Canillas [this message]
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