Re: gdk_pixbuf_loader_write memory leak

[milton soto <miltonpsoto yahoo com>]

Hi

Thank You VERY VERY much for responding 

I?m new to GTK/GDK and I?m have a hard time
finding (good) information/examples on pixmap/pixbuf

I tried using pixmap?s but kept on getting junk displayed.
I guess I missed a step or two. 

If you can send me a small example or point me to a web page
that has an example on how to do the steps you suggested, I 
would gladly appreciated.



YOUR STEPS

You just need to convert your raw pixels to GdkRGB and display it.

The faster (but it works with local X server only) way is:
1. Create shared pixmap.
2. Allocate all pixels (create relation raw pixel -> actual display 
pixel).
3. Fill pixmap.
4. Put it on screen.
5. Go to 3.


Again,  Thank You for the info.

Milt




--- Olexiy Avramchenko <olexiy irtech cn ua> wrote:
> milton soto wrote:
>
> > Hello
> >
> > I desperately need some help.
> >
> > The following coded works, but has a memory leak.
> >
> >
> > Code Description:
> >
> >   The coded will get a  raw gray picture from  a camera every 
> >   30 millisecond . Each image is converted into a jpeg image 
> >   (raw_to_jpeg). The jpeg image is then loaded into the loader, 
> >   passed to the pixbuf, and render to the display window.
> >
> >
> > Any help will be gladly appreciated.
> >
> > Also, is this the quickest way to display a jpeg image???
> I dont understand what are you doing... Why do you need raw -> jpeg 
> conversion ? It consumes CPU time and you getting worse image quality
> in 
> result.
>
> You just need to convert your raw pixels to GdkRGB and display it.
>
> The faster (but it works with local X server only) way is:
> 1. Create shared pixmap.
> 2. Allocate all pixels (create relation raw pixel -> actual display
> pixel).
> 3. Fill pixmap.
> 4. Put it on screen.
> 5. Go to 3.
>
> > static gboolean update_display (gpointer user_data)
> > {
> >  
> <skipped>
>
> >  gdk_pixbuf_ref(loader_pixbuf);
> Dont ref it. You put an additional reference to object, so it will
> not 
> be freed after single unref.
>
> >  gdk_pixbuf_render_to_drawable(loader_pixbuf,
> > display_area->window,display_area->style->fg_gc[GTK_STATE_NORMAL],
> 0,
> > 0, 0, 0, 640, 480, GDK_RGB_DITHER_NONE, 0, 0);
> >                                          
> >  gdk_pixbuf_unref(loader_pixbuf);
> >
> > }
> >  


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