Re: GdkPixbufLoader size-prepared troubles

[Alesh Slovak <alesh slovak avasys jp>]

Hi Jim,

Thanks for taking the time to reply.

On 08/11/2010 02:13 PM, Jim Hayward wrote:
> Bluefish uses the size-prepared signal to scale images while they are
> being written. The size-prepared signal is only emitted one.

I took a look at the code you provided, but it doesn't seem to be using the 
other pixbuf loader signals: area-prepared and area-updated. So it doesn't 
directly map to what I am trying to do. However, your code and your comment 
below did lead me down the right path.

> > But when I do this, the image data never makes it into the pixbuf, although the
> > pixbuf itself appears to get sized correctly.
>
> Are you trying to get the pixbuf from the loader too soon?

This appears to be the case. I was getting the pixbuf from the loader in the 
handler for the area-prepared signal, which worked just fine as long as I didn't 
call gdk_pixbuf_loader_set_size() in the size-prepared handler.

Getting the pixbuf in the area-updated handler fixes this particular problem. So 
now I can get a scaled image out of the pixbuf loader. I am still receiving 
multiple size-prepared signals, but it doesn't seem to be having any ill effects 
as far as I can tell.

I happened to notice one peculiar thing though, when I call 
gdk_pixbuf_loader_set_size(), the area-updated signal is only ever called once, 
after the image has finished loading. Thus, I can't update the display to show 
the image loading progressively. I guess loading/displaying image data 
progressively and scaling at the same time are not supported by GdkPixbufLoader?

Thanks again,
--
Alesh Slovak                    Linux Team -- AVASYS Corporation
alesh slovak avasys jp          http://avasys.jp