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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