Re: GTK3 deprecation fix (GtkFontSelection replaced with GtkFontChooser)

[Frans Oilinki <moilinki@gmail.com>]

Hello Jan,

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... ;-)

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
>>
>
>