Re: Get lenght (bytes) of pixels in GdkPixbuf

["Gustavo J. A. M. " Carneiro <gjc inescporto pt>]

On Mon, 2003-02-10 at 12:40, Vladimir Djokic wrote:
>       Good day,
>       Developers!
>
>       I'm stuck. In school project, have a NewStudentDlg, and among other
> data to input, there is a student photo option. 
>       I load GdkPixbuf from file, scale if needed, and create new GktImage
> (from GdkPixbuf) to show in this dlg. But, since I'm using MySQL to
> store student data, I need to get pixels (thats easy, there is a func:),
> but NEED length of this data, too (want to store image in MySQL
> database). I have been reading docs about GdkPixbuf, but made little
> progress.

  It depends in how you store the information. Do you mean you store the
pixbuf as raw data in the database?
  The minimum buffer size holding the image would be:
        size = (height - 1)*rowstride + width*n_channels; (possibly, gdk-pixbuf
allocates height*rowstride, but some bytes at the end would be unused
this way.

  *However*, are you sure it's a good idea to store raw images? Wouldn't
it be better to save the pixbuf (gdk_pixbuf_save) to a file, and then
just store the file name in the database?

>       If someone could just point me where to look (I know google is God:),
> and what to read, so I can understand how this stuff works, or just tell
> me what steps I need to take to get length of pixel data?
>
>       Thanks,
>       Vladimir.
-- 
Gustavo João Alves Marques Carneiro
<gjc inescporto pt> <gustavo users sourceforge net>