liborc question

[Peter Maersk-Moller]

Hi Jérôme.

On Mon, Sep 28, 2015 at 6:39 PM, Jérôme Laheurte <
jerome-bugzilla at jeromelaheurte.net> wrote:

> Unless something has drastically changed since the last time I wrote Orc
> code, that is not possible; source and destination pointers are incremented
> by the « register » size, which must be a power of 2 up to eight, I think;
> three is out of the question.
>

So operating on an array of 3 bytes per pixels such as the RGB/BGR layout
with the byte array layout RGBRGBRGB... is really difficult or near
impossible?

And if that is the case, if one wants to use orc, the array needs to be
conerted into something like RGB.RGB.RGB. etc. with an extra byte? And such
a conversion can't really be done much faster than with a loop like this

for (int i=0 ; i < N ; i++) {
  *dst++ = *src++;
  *dst++ = *src++;
  *dst++ = *src++;
  *dst++ = 255;
};

which to begin with was what I wanted orc to substitute using SIMDs
commands.

Is that more or less the conclusion?

Best regards
Peter MM
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