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A
asdf1
Participating Frequently
January 20, 2012
Question

render pixel(s)

  • January 20, 2012
  • 1 reply
  • 1398 views

I currently don't see how i can achieve this. I have an array of pixel data, looking like this:

unsigned char pixels[width*height][3]; //1024*768

So to get data fom a pixel i do this:

pixels[0][0] = R;

pixels[0][1] = G;

pixels[0][2] = B;

Next thing i want to do is write all these pixels to my layer.What exactly do i have to do?

This topic has been closed for replies.

1 reply

A
asdf1Author
Participating Frequently
January 21, 2012

I guess i got a bit further. I'm using PF_ITERATE to iterate over all the pixels (not using the suite right now).

So PF_ITERATE calls my callback function for each pixel. My callback function looks like this right now:

static PF_Err 
ChangePixelColor (
          long refcon, 
          long x, long y, 
          PF_Pixel *in, PF_Pixel *out)
{
     register ShiftInfo     *si = (ShiftInfo *)refcon;
     PF_InData               *in_data = si->in_data;
     PF_Err                    err;

     // CHANGE COLOR TO RED?
     // JUST A TRYOUT, DOESN'T HELP :-(
     out->alpha = 255;
     out->red = 255;
     out->green = 0;
     out->blue = 0;

     err = PF_SUBPIXEL_SAMPLE(x, y, &si->samp_pb, out);

     return err;
}

Obviously, this isn't changing any pixels yet, because i'm not sure what to do next. This function gives me the current x and y location of the pixel and also the PF_Pixel *in data.

How can i change the color of the current pixel...?

EDIT

I think i found my problem. I wasn't casting the rgb values to an unsigned char. Its painting the pixels now.

S
Community Expert
shachar carmiCommunity Expert
Community Expert
January 21, 2012

glad to see you solved it man!

now you can get rid of.

err = PF_SUBPIXEL_SAMPLE(x, y, &si->samp_pb, out);

it fetches you the subpixel sample from the input world in the x/y coordinates you provide.

currently you're asking for what AE already gives you in *in.

so you're just slowing yourself down considerably, without any reason.

is you want a faster implementation, look at the CCU sample.

it shows how to access the output pixels directly without using the iteration suite.

if you combine the with iterate_generic() to iterate lines, you'll get much better speed than you would with the current iteration suite.

but no hurry. get your plug-in up and running first.

:-)

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