fbdev+xrand: no scaling?

[Alex Deucher]

On Fri, Jun 14, 2013 at 9:07 AM, john fulgor <johnfulgor at yahoo.com> wrote:
>
> Well, isn't there some trick I can try? Investigate on the linux framebuffer
> driver?
> I'm very surprised how it is difficult to get a matrix of pixels ans squeeze
> it.

You can try and implement sort for transforms using software and
shadow framebuffer.

Alex

> John
>
> ________________________________
> Da: Alex Deucher <alexdeucher at gmail.com>
> A: john fulgor <johnfulgor at yahoo.com>
> Cc: "xorg-devel at lists.x.org" <xorg-devel at lists.x.org>
> Inviato: Venerdì 14 Giugno 2013 14:38
> Oggetto: Re: fbdev+xrand: no scaling?
>
> On Fri, Jun 14, 2013 at 7:04 AM, john fulgor <johnfulgor at yahoo.com> wrote:
>> Hello all,
>> I need to scale my application output to fit my tablet display. I've tried
>> to randr extension (http://crunchbang.org/forums/viewtopic.php?id=20634)
>> but
>> it does not work. Digging in the code I've found that crtc->transforms is
>> set to False in the RRCrtcTransformSet. Does this mean that transform is
>> not
>> available on my configuration? If so, shall it be so difficult to grab the
>> pixels, scale them and send them out? Is there a place in code where I can
>> get access to pixels and perform this transform? I'm a software developer,
>> but I've no experience with x server. No matter if the solution is not
>> elegant, I need to solve this problem someway.
>>
>> I've tried with Xfbdev+x11vnc+vncviever, but it is very very slow.
>
> At the moment crtc transformations require hardware acceleration.
>
> Alex
>
>>
>>
>> int RRCrtcTransformSet(RRCrtcPtr crtc,
>>                    PictTransformPtr transform,
>>                    struct pixman_f_transform *f_transform,
>>                    struct pixman_f_transform *f_inverse,
>>                    char *filter_name,
>>                    int filter_len, xFixed * params, int nparams)
>> {
>>    PictFilterPtr filter = NULL;
>>    int width = 0, height = 0;
>>    if (!crtc->transforms)
>>        return BadValue;  /*Fails here!*/
>>
>>
>> kernel 3.0.57
>> server 1.11.3
>>
>> 1024x600
>>
>> fbdev
>>
>> Thank you!
>> Patrick
>>
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>
>