jgtk uses gtksourceview instead of directly paints on a canvas. If
interline spacing can be done, it would be via gtktextview/gtksourceview
api. gedit on gnome also use gtksourceview, is it also capable of changing
interline spacing?
Вск, 23 Янв 2011, Charles Turner писал(а):
> On Jan 23, 2011, at 6:53 AM, chris burke wrote:
>
> > I don't know how to do this, any ideas? The usual Mac Vim does not use GTK.
>
> I have no practical experience with this but:
>
> The setting for gvim is:
>
> > set linespace = 1 " integer values with 1 being default
>
>
> and gvim on Linux, for example, uses GTK/Cairo/Pango for text rendering.
>
> Looking through the gvim source I found this in gui_gtk_x11.c:
>
> > /*
> > * Adjust gui.char_height (after 'linespace' was changed).
> > */
> > int
> > gui_mch_adjust_charheight(void)
> > {
> > PangoFontMetrics *metrics;
> > int ascent;
> > int descent;
> >
> > metrics = pango_context_get_metrics(gui.text_context, gui.norm_font,
> > pango_context_get_language(gui.text_context));
> > ascent = pango_font_metrics_get_ascent(metrics);
> > descent = pango_font_metrics_get_descent(metrics);
> >
> > pango_font_metrics_unref(metrics);
> >
> > gui.char_height = (ascent + descent + PANGO_SCALE - 1) / PANGO_SCALE
> > + p_linespace;
> > /* LINTED: avoid warning: bitwise operation on signed value */
> > gui.char_ascent = PANGO_PIXELS(ascent + p_linespace * PANGO_SCALE / 2);
> >
> > /* A not-positive value of char_height may crash Vim. Only happens
> > * if 'linespace' is negative (which does make sense sometimes). */
> > gui.char_ascent = MAX(gui.char_ascent, 0);
> > gui.char_height = MAX(gui.char_height, gui.char_ascent + 1);
> >
> > return OK;
> > }
>
>
> There's a mac-specific gui_gtk_mac.c, but it enables options to use the
> native ATSUI rendering features, which is, I guess, not where you want to go.
>
> HTH, Charles
>
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