liborc question

[Peter Maersk-Moller]

Hi

Trying to add some speed-up for handling some gstreamer RGB streams, using
liborc seems the right path for new plugins although it is not necessary
the easiest path. Liborc does not seem to have a functional mailing list so
I hope this is the right place to ask questions.

The goal is to implement the following code using SIMD with liborc

void AddAlphaChannel(u_int8_t *dst, u_int8_t *src, u_int32_t w, u_int32_t h)
{
        for (int row=0 ; row < h ; row++)
                for (int col=0; col < w ; col++) {
                        *dst++ = *src++;
                        *dst++ = *src++;
                        *dst++ = *src++;
                        *dst++ = 0xff;
                }
}

Obviously the source and destination are arrays with width*height pixels.
Trying to do this using liborc seems to be hard, at least right now. The
code I tried in first go is this

.function AddAlphaChannel
.dest 4 dst orc_uint32
.source 1 src orc_uint8
.const 1 a 255
.temp 1 g
.temp 1 r
.temp 2 bg
.temp 2 ra

loadoffb g src 1
loadoffb r src 2
mergebw bg src g
mergebw ra r a
mergewl dst bg ra

However the code is wrong since the destination array has 4 bytes per pixel
and the source array only has 3 bytes per pixel. Any hints on how to use
liborc on arrays where source and destinations has different number of
bytes per set (per pixel).

Best regards
Peter MM
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