RE: [Gtk1-win-developers] Progress - decloaked GDK pointers

[Donald M. <do...@dr...>]

Do you have a patch for these changes/bug-fixes?

Donald. 

> -----Original Message-----
> From: gtk...@li... 
> [mailto:gtk...@li...] On 
> Behalf Of Robin Rowe
> Sent: 04 March 2004 07:03
> To: gtk...@li...
> Subject: [Gtk1-win-developers] Progress - decloaked GDK pointers
> 
> Hi. Hadn't found time to touch GTK1 for a couple months. Been 
> busy on other
> things.
> 
> My attempt to use GDK2 with GTK1 didn't work out. Am back 
> working on GDK1.
> That has serious problems with releasing HDC handles with 
> live resources in
> them, causing random crashes inside Windows. Same problem 
> we've known about
> since last year. That GDK by design casts objects all over 
> the place defeats
> debugging. This pointer cloaking had me a bit discouraged.
> 
> Changed GTK1 this week to have all the by-design GTK pointer 
> cloaking turned
> off so I can see clearly now what is going on. What that means is that
> GdkWhatever, GdkWhateverPrivate, and GdkWhateverPrivateWin32 
> are all the
> same struct type now. In making that change I discovered one 
> place where an
> up-cast was converting to a type larger than had been 
> allocated in memory.
> One bug fixed.
> 
> Testing with HelloGtk, my new decloaked GDK1 immediately 
> hurled on g_free,
> which puzzled me a bit. Rewrote the basic g_... glib memory 
> handlers to
> streamline them, but it still crashed. Then I realized that 
> for Windows apps
> and dlls there are separate heaps, that you have to keep 
> malloc/free calls
> symmetric to the caller's address space. In other words, no 
> calling local
> free on a pointer malloc-ed inside a dll. Inadvertently, a 
> header file macro
> was doing that. Making all g_... memory functions exported 
> dll functions
> fixed it.
> 
> Am encouraged that I seem to be back on the right track and 
> can see what's
> going on while crawling around in the VC++ debugger and 
> BoundsChecker. Looks
> like quite a few repairs ahead, but making progress.
> 
> After the GTK1 HDC bugs are fixed I would like to work on 
> tablet support and
> a new macro recorder feature. Been wanting to work on both of 
> those a long
> time.
> 
> Cheers,
> 
> Robin
> -------------------------------------------------------------------
> Rob...@Mo...   Hollywood, California
> www.CinePaint.org   Open source digital motion picture film software
> 
> 
> 
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