fbdev+xrand: no scaling?

[Alex Deucher]

On Fri, Jun 14, 2013 at 9:12 AM, Alex Deucher <alexdeucher at gmail.com> wrote:
> 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.

s/sort/support/

>
> 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
>>>
>>> _______________________________________________
>>> xorg-devel at lists.x.org: X.Org development
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>>
>>