Re: help about the display iterator.

[A. Soare]

Thanks.

Yes, I have read the beginning of xdisp.c.

I have also saw the trace of redisplay_internal. I did saw that 
redisplay_internal is the function that created the desired_matrix, i.e. the 
new image of the next refresh of screen. And also from redisplay_internal are 
called the low-level graphical functions that send the image to the video card.

What confuses me very hard is the number of variables that appear inside 
redisplay_internal. I do not understand where to start reading this function. 
For example, when I see

  /* The flag redisplay_performed_directly_p is set by
     direct_output_for_insert when it already did the whole screen
     update necessary.  */
  if (redisplay_performed_directly_p)
    {
      redisplay_performed_directly_p = 0;
      if (!hscroll_windows (selected_window))
        return;
    }

 I understand that when redisplay_internal is called after 
direct_output_for_insert, redisplay_internal stops here. But 
direct_output_for_insert is never called on my emacs. I use GTK+ now.

So it is almost impossible to understand what happens just looking at the code.

To be more specific, let us consider this simple case: suppose that I use the 
console, not graphics, and that I press the key 'x'; could you make me a brief 
description of the trace of the code, starting from the moment when the 
function read_char forces redisplay, until the character is send to the 
phisical display?

Thanks in advance for any help.

Alin.





> 
> "A. Soare" <address@hidden> writes:
> 
> > However, I do not understand the mechanism from `redisplay_ineternal'
> > (I have the impression that it's this function that creates the
> > desired_matrix of glyphs) and refresh the display.
> 
> You'll have to be more specific in asking these sorts of questions, I'm
> afraid.  Have you looked at the commentary at the beginning of xdisp.c?
> 
> 


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