[Gimp-developer] How to get the data out of boundary in area-filte​r-operatio​ns of GIMP?

[Zhang Peixuan <zhangpeixuan cn gmail com>]

Hello all,

 

In GIMP,the area-filter-operations always get more pixel data out of the input buffer's extent, then output the processed data.

So, how the pixel datas out of extent are gotten in  gegl-buffer-set and gegl-buffer-get ,maybe they are all set 0x00, or another setting method??

such as:

      gegl_buffer_get(input_buffer, 1.0, src_rect,  format, in_data,GEGL_AUTO_ROWSTRIDE);

if src_rect is larger than input_buffer->extent ,what data will be stored in in_data? What is the machanism?

 

Now our progress is slow ,because of the problem. So,can anyone help us explain it?

We're so glad to receive any advice from you!

 

Thanks a lot!