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Re: Fwd: [PATCH 1/2] Framebuffer split

From: Vladimir 'phcoder' Serbinenko
Subject: Re: Fwd: [PATCH 1/2] Framebuffer split
Date: Mon, 10 Aug 2009 21:43:58 +0200

> I would like a video_fb function like
> grub_video_fb_create_render_target_from_buffer(void * buffer, int
> allocated, const grub_video_mode_info_t * mode_info)
Well this is pretty much what we do directly. New fields can be added
to fbrender_target with no problem. (btw currently driver manages only
screen render target and completely delegates other functions to
> I am sure that for doing transparent rotation in video_fb
> encapsulation is good. I can do without it or patch it in with the
> rotation if I get it into working state.
Actually it's enough to follow simple rules like
blitting target on target isn't rotated but coordinates are adjusted
blitting non-target on target is rotated.
This way video adapter doesn't have to know about nature of blitting operations.
Anyway you need  to adjust width and height returned by mode_info.
A function video_fb_transform_coordinates can do this. This way
framebuffer can apply any transformation, not just rotation w/o driver
to know.
> Thanks
> Michal
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Vladimir 'phcoder' Serbinenko

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