[wx 2.6.3, X11, g++4.0.3] wxHtml crashes in unicode build because of NULL pangoContext

[Ryan Jaeger]

Hi,

 

I'm trying to run the htmlview sample in the wxX11 widgets build. Here are
the config options I used to build widgets:

wxUSE_MONOLITHIC=no 
wxUSE_LIBPNG=yes 
wxUSE_LIBJPEG=yes 
wxUSE_LIBSDL=yes 
wxUSE_SHARED=no 
wxUSE_DEBUG=yes 
wxUSE_UNICODE=yes 
wxUSE_HTML=yes 
wxUSE_MEDIACTRL=yes 
wxUSE_X11=yes

 

The sample compiles without error, but will crash on runtime displaying
these errors:

(process:11956): Pango-CRITICAL **: pango_layout_new: assertion `context !=
NULL' failed 

(process:11956): Pango-CRITICAL **: pango_layout_set_font_description:
assertion `layout ! = NULL' failed 

(process:11956): Pango-CRITICAL **: pango_layout_set_text: assertion `layout
!= NULL' failed 

(process:11956): Pango-CRITICAL **: pango_layout_get_extents: assertion
`layout != NULL' failed

 

I've been able to track the issue to some code in src/x11/dcclient.cpp

 

wxWindowDC::wxWindowDC()

{

    .

    .

   #if wxUSE_UNICODE

     m_context = (pangoContext *)NULL;

     m_fontdesc = (pangoFontDescription *)NULL;

   #endif

}

 

If the m_context is initialized to wxTheApp->GetpangoContext() (as found in
the wxWindowDC(wxWindow *) ctor), then the 

sample app won't crash and it will load (except for the correct fonts.). It
appears that this ctor is being called when the wxWindow(wxWindow*) ctor
should be used instead.

 

I'm having difficulty tracking down why this issue exists in wxHtml and
where the fix should go. Can anyone point me in the right direction?

 

Cheers,

 

ryan

 

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