Re: GTK3 deprecation fix (GtkFontSelection replaced with GtkFontChooser)

["Jan Djärv" <jan.h.d@swipnet.se>]

20 aug 2012 kl. 11:45 skrev Frans Oilinki:

> Hello Jan,

Hello.

> 
> Sorry for late reply, I just now noticed your email by searching my
> overpouring inbox after witnessing the change in git repository as a
> result of performing "git pull".
> 
> After my initial email report I compared unpatched version of emacs
> with older font selection dialog (running in a different machine), and
> also wondered about the usability degradation. I wish things will
> quickly improve in GTK3 front so that I will not have to feel guilty
> for lowering usability of Emacs with my report... ;-)

When Gtk+ changes we can just move with it.  This change would have been made at some point anyway, so don't feel guilty :-)
On the plus side, it enabled the fix of 3228.

	Jan D.



> 
> Frans
> 
> On Sat, Aug 11, 2012 at 5:00 PM, Jan Djärv <jan.h.d@swipnet.se> wrote:
>> 2012-08-10 11:35, Frans Oilinki skrev:
>>> 
>>> Hello,
>> 
>> 
>> Hello.
>> 
>> I guess we have to conform then.  I fixed this in a backwards compatible
>> fashion.
>> 
>> The chooser dialog is a huge step backwards in usability.  It is larger, it
>> is slower (esp. X over a slow link), it emits warnings to the console when
>> it can't render a font, like this:
>> 
>> (emacs:9374): Pango-WARNING **: failed to choose a font, expect ugly output.
>> engine-type='PangoRenderFc', script='latin'
>> 
>> (emacs:9374): Pango-WARNING **: failed to choose a font, expect ugly output.
>> engine-type='PangoRenderFc', script='common'
>> 
>> and it uses a red X for minus on some themes (see screenshot) which is
>> confusing.  But hey, this is "progress".
>> 
>>        Jan D.
>> 
>> 
>> 
>> 
>>> 
>>> I just tried building the newest emacs master branch (git cloned
>>> repository), running Ubuntu 12.04 GNU/Linux system.
>>> 
>>> I made a mistake of adding option  "--enable-gcc-warnings" to
>>> "./configure" (not anticipating it would add option -Werror :-). The
>>> complete list of options to ./configure: "--prefix=/usr/local
>>> --program-suffix=-git.master --enable-check-lisp-object-type
>>> --enable-link-time-optimization  --enable-gcc-warnings
>>> --with-x-toolkit=gtk3 --with-x".
>>> 
>>> The file "src/gtkutil.c" gave the following warning:
>>> 
>>>     gcc -std=gnu99 -c  -Demacs  -I.
>>> -I/home/fo/work/OpenSource/Emacs/emacs/src -I../lib
>>> -I/home/fo/work/OpenSource/Emacs/emacs/src/../lib   -pthread -isystem
>>> /usr/include/gtk-3.0 -isystem /usr/include/pango-1.0 -isystem
>>> /usr/include/gio-unix-2.0/ -isystem /usr/include/atk-1.0 -isystem
>>> /usr/include/cairo -isystem /usr/include/gdk-pixbuf-2.0 -isystem
>>> /usr/include/freetype2 -isystem /usr/include/glib-2.0 -isystem
>>> /usr/lib/x86_64-linux-gnu/glib-2.0/include -isystem
>>> /usr/include/pixman-1 -isystem /usr/include/libpng12   -isystem
>>> /usr/include/freetype2    -isystem /usr/include/alsa   -pthread
>>> -isystem /usr/include/librsvg-2.0 -isystem /usr/include/glib-2.0
>>> -isystem /usr/lib/x86_64-linux-gnu/glib-2.0/include -isystem
>>> /usr/include/gdk-pixbuf-2.0 -isystem /usr/include/cairo -isystem
>>> /usr/include/libpng12 -isystem /usr/include/pixman-1 -isystem
>>> /usr/include/freetype2   -fopenmp -isystem /usr/include/ImageMagick
>>> -isystem /usr/include/libxml2   -isystem /usr/include/dbus-1.0
>>> -isystem /usr/lib/x86_64-linux-gnu/dbus-1.0/include   -pthread
>>> -isystem /usr/include/glib-2.0 -isystem
>>> /usr/lib/x86_64-linux-gnu/glib-2.0/include   -pthread -isystem
>>> /usr/include/gconf/2 -isystem /usr/include/dbus-1.0 -isystem
>>> /usr/lib/x86_64-linux-gnu/dbus-1.0/include -isystem
>>> /usr/include/glib-2.0 -isystem
>>> /usr/lib/x86_64-linux-gnu/glib-2.0/include   -isystem
>>> /usr/include/freetype2    -isystem /usr/include/freetype2    -MMD -MF
>>> deps/gtkutil.d -MP  -isystem /usr/include/p11-kit-1   -Wall -W
>>> -Wformat-y2k -Wformat-security -Winit-self -Wmissing-include-dirs
>>> -Wunused -Wunknown-pragmas -Wstrict-aliasing
>>> -Wdeclaration-after-statement -Wpointer-arith -Wbad-function-cast
>>> -Wcast-align -Wwrite-strings -Wstrict-prototypes
>>> -Wold-style-definition -Wmissing-prototypes -Wmissing-declarations
>>> -Wmissing-noreturn -Wmissing-format-attribute -Wpacked -Winvalid-pch
>>> -Wvolatile-register-var -Wdisabled-optimization
>>> -Wbuiltin-macro-redefined -Wmudflap -Wpacked-bitfield-compat
>>> -Wattributes -Wcoverage-mismatch -Wunused-macros -Wabi -Wcpp
>>> -Wdeprecated -Wdeprecated-declarations -Wdiv-by-zero
>>> -Wdouble-promotion -Wendif-labels -Wextra -Wformat-contains-nul
>>> -Wformat-extra-args -Wformat-zero-length -Wformat=2 -Wmultichar
>>> -Wnormalized=nfc -Woverflow -Wpointer-to-int-cast -Wpragmas
>>> -Wsuggest-attribute=const -Wsuggest-attribute=noreturn -Wtrampolines
>>> -Wno-missing-field-initializers -Wno-missing-field-initializers
>>> -Wno-sign-compare -Wno-type-limits -Wno-switch -Wno-unused-parameter
>>> -Wno-format-nonliteral -Wno-logical-op -fdiagnostics-show-option
>>> -funit-at-a-time -Werror -g -O2 -flto=1 gtkutil.c
>>>     gtkutil.c: In function ‘xg_get_font_name’:
>>>     gtkutil.c:2003:3: error: ‘gtk_font_selection_dialog_new’ is
>>> deprecated (declared at
>>> /usr/include/gtk-3.0/gtk/deprecated/gtkfontsel.h:142): Use
>>> 'GtkFontChooser' instead [-Werror=deprecated-declarations]
>>>     gtkutil.c:2006:3: error: ‘gtk_font_selection_dialog_set_font_name’
>>> is deprecated (declared at
>>> /usr/include/gtk-3.0/gtk/deprecated/gtkfontsel.h:153): Use
>>> 'GtkFontChooser' instead [-Werror=deprecated-declarations]
>>>     gtkutil.c:2019:7: error: ‘gtk_font_selection_dialog_get_font_name’
>>> is deprecated (declared at
>>> /usr/include/gtk-3.0/gtk/deprecated/gtkfontsel.h:151): Use
>>> 'GtkFontChooser' instead [-Werror=deprecated-declarations]
>>>     cc1: all warnings being treated as errors
>>>     make[1]: *** [gtkutil.o] Error 1
>>>     make[1]: *** Waiting for unfinished jobs....
>>>     make[1]: Leaving directory `/home/fo/work/OpenSource/Emacs/emacs/src'
>>>     make: *** [src] Error 2
>>> 
>>> I found GTK3 API documentation and within couple of minutes of reading
>>> quickly applied the following fix:
>>> 
>>>     $ git diff
>>>      diff --git a/src/gtkutil.c b/src/gtkutil.c
>>>      index 4879479..ce9b851 100644
>>>      --- a/src/gtkutil.c
>>>      +++ b/src/gtkutil.c
>>>      @@ -2000,11 +2000,10 @@ xg_get_font_name (FRAME_PTR f, const char
>>> *default_name)
>>>         sigblock (sigmask (__SIGRTMIN));
>>>       #endif /* HAVE_PTHREAD */
>>> 
>>>      -  w = gtk_font_selection_dialog_new ("Pick a font");
>>>      +  w = gtk_font_chooser_dialog_new ("Pick a font", NULL);
>>>         if (!default_name)
>>>           default_name = "Monospace 10";
>>>      -  gtk_font_selection_dialog_set_font_name
>>> (GTK_FONT_SELECTION_DIALOG (w),
>>>      -                                           default_name);
>>>      +  gtk_font_chooser_set_font (GTK_FONT_CHOOSER (w), default_name);
>>> 
>>>         gtk_widget_set_name (w, "emacs-fontdialog");
>>> 
>>>      @@ -2015,8 +2014,7 @@ xg_get_font_name (FRAME_PTR f, const char
>>> *default_name)
>>>       #endif
>>> 
>>>         if (done == GTK_RESPONSE_OK)
>>>      -    fontname = gtk_font_selection_dialog_get_font_name
>>>      -      (GTK_FONT_SELECTION_DIALOG (w));
>>>      +    fontname = gtk_font_chooser_get_font(GTK_FONT_CHOOSER (w));
>>> 
>>>         gtk_widget_destroy (w);
>>>         return fontname;
>>> 
>>> This fixed the compilation for my Ubuntu 12.04 machine (gtk3 seems to
>>> be version 3.4.2). I tried selecting font (by [SHIFT] +
>>> [LEFT-MOUSE-BUTTON]), and the new font selection widget worked for me.
>>> 
>>> Note that I have never before done programming with GTK API, so you
>>> might review this with some care, and check the compatibility with the
>>> supported versions of GTK3 if you choose to apply this kind of fix to
>>> future versions of Emacs.
>>> 
>>> Best regards and thanks for everybody's work for fabulous text editing
>>> environment (or whatever emacs should be called),
>>> 
>>> Frans
>>> 
>> 
>>