Re: Pb w/ gc, pixmap and darea

["Lewin A.R.W. Edwards" <larwe larwe com>]

Hi Taura,

> > >Now you might want to use the GDK RGB buffers if you plan to
> >
> > Eeee, but they are so darn slow. I have an app that opens a screen-size
>
>   Now with respect to your specific issue, if you feel that it would
> be faster on client side only operations and you don't plan to do anything
> fancy then you do not need Gdk RGB buffers.

My scenario is this: I have total control over the hardware (cue manic 
laugh). I know the physical display format. I never need to care about my 
application running correctly on any other hardware. I work internally with 
8:8:8 RGB but the display is physically 5:6:5. All that concerns me is that 
I want a faster way of rendering content onto the screen. I get much faster 
results using the VESA framebuffer console instead of GDK buffers, but I 
don't want to do that because one of my subprograms works much better if it 
can use xvm to change resolution temporarily on the fly.

> However unfortunatly, a lot of users prefer to use Gdk RGB buffers
> (I don't know why though). But I just wanted to warn you on that
> as Gdk RGB buffers apparently are a strong trend. *G*

Heheh. They _are_ very simple and intuitive to work with, I'll say. You can 
take code written for direct hardware access (frame buffer) and work with 
an RGB buffer, occasionally calling gdk to draw that buffer onto the screen.

> > about the bottom sixth of the screen doesn't get rendered. It seems that
> > gdk_draw_rgb_image sends the image in roughly 128x128-sized blocks; I can
> > see them being drawn.
> >
> Well Gdk RGB buffers does use SHM as I recall, but if you plan to use

This is weird. How come it is being rendered in blocks then? It seems to be 
adding block copy operations to some kind of task queue, and these are 
getting executed one by one as a background process which will halt if I 
don't force some idle time in my own process.

> a GdkPixmap only, and do everything on server side (no GdkImages
> or anything) then you don't need the Gdk RGB buffers.

Pixmaps are only supported under 2.x though, aren't they? What exactly do I 
have to do to move from my current model to pixmaps?

-- Lewin A.R.W. Edwards
Embedded Engineer, Digi-Frame Inc.
Work: http://www.digi-frame.com/
Tel (914) 937-4090 9am-6:30pm M-F ET
Personal: http://www.larwe.com/ http://www.zws.com/