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Re: [f-cpu] Status quo

On Wed, Apr 1, 2015 at 1:10 AM,  <whygee@xxxxxxxxx> wrote:
> Le 2015-04-01 00:48, Cedric BAIL a Ãcrit :
>> On Tue, Mar 31, 2015 at 11:57 PM,  <whygee@xxxxxxxxx> wrote:
>>> I seem to remember that the RPi's Broadcom chip has several DMA channels,
>>> including one with "2D" capability, it might do what you seem to
>>> describe.
>>> It takes strips of equal sizes from one memory, and puts them with
>>> different
>>> spacings or strides somewhere else. Is that what you think of ?
>> Not really. It would help for the case of DMA from/to the GPU, but not
>> for all the 2D rendering case you could do on the CPU.
> Could you write an elaborate document about it, like a sort of report ?
> I'm confused again and a few diagrams will help me :-)

Here is a link that explains it for a YUV surface :
http://linuxtv.org/downloads/v4l-dvb-apis/re32.html . The same idea
apply whatever the color space.
Cedric BAIL
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