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maybe even better layouting (ie the previous was off by a few marks). memo to self, what do to about PangoLanguage?

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This commit is contained in:
Mikael Magnusson 2005-07-16 16:11:58 +00:00
parent e37b07bfa0
commit 2fb7b70ccb
1 changed files with 37 additions and 13 deletions
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48
render/font.c
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@ -43,9 +43,7 @@ FcObjectType objs[] = {
{ OB_SHADOW_ALPHA, FcTypeInteger }
};
PangoFontMap *pfm;
PangoContext *context;
static PangoContext *context;
static gboolean started = FALSE;
static void font_startup(void)
@ -58,7 +56,6 @@ static void font_startup(void)
#ifdef USE_PANGO
g_type_init();
/* these will never be freed, but we will need them until we shut down anyway */
pfm = pango_xft_get_font_map(RrDisplay(NULL), RrScreen(NULL));
context = pango_xft_get_context(RrDisplay(NULL), RrScreen(NULL));
#endif /* USE_PANGO */
/* Here we are teaching xft about the shadow, shadowoffset & shadowtint */
@ -127,8 +124,8 @@ static RrFont *openfont(const RrInstance *inst, gchar *fontstring)
pango_font_description_set_size(out->pango_font_description, tmp_int*PANGO_SCALE);
}
PangoFontset *pfs = pango_font_map_load_fontset(pfm, context, out->pango_font_description, NULL);
PangoFontMetrics *metrics = pango_fontset_get_metrics(pfs);
PangoLanguage *ln;
PangoFontMetrics *metrics = pango_context_get_metrics(context, out->pango_font_description, ln = pango_language_from_string("en_US"));
out->pango_ascent = pango_font_metrics_get_ascent(metrics);
out->pango_descent = pango_font_metrics_get_descent(metrics);
pango_font_metrics_unref(metrics);
@ -234,7 +231,8 @@ gint RrFontHeight(const RrFont *f)
#ifdef USE_PANGO
return (f->pango_ascent
+ f->pango_descent
) / PANGO_SCALE;
) / PANGO_SCALE +
(f->shadow ? f->offset : 0);
#else
return f->xftfont->ascent + f->xftfont->descent +
(f->shadow ? f->offset : 0);
@ -246,6 +244,30 @@ gint RrFontMaxCharWidth(const RrFont *f)
return (signed) f->xftfont->max_advance_width;
}
#ifdef USE_PANGO
static inline int font_calculate_baseline(RrFont *f, gint height)
{
/* For my own reference:
* _________
* ^space/2 ^height ^baseline
* v_________|_ |
* | ^ascent | _ _
* | | | | |_ _____ _| |_ _ _
* | | | | _/ -_) \ / _| || |
* | v_________v \__\___/_\_\\__|\_, |
* | ^descent |__/
* __________|_v
* ^space/2 |
* V_________v
*/
int asc = f->pango_ascent;
int ascdesc = asc + f->pango_descent;
int space = height * PANGO_SCALE - ascdesc;
int baseline = space / 2 + asc;
return baseline / PANGO_SCALE;
}
#endif
void RrFontDraw(XftDraw *d, RrTextureText *t, RrRect *area)
{
gint x,y,w,h;
@ -262,16 +284,18 @@ void RrFontDraw(XftDraw *d, RrTextureText *t, RrRect *area)
pl = pango_layout_new (context);
#endif /* USE_PANGO */
/* center vertically */
/* center vertically
* for xft we pass the top edge of the text for positioning... */
#ifndef USE_PANGO
y = area->y +
(area->height - RrFontHeight(t->font)) / 2;
#else
/* but for pango we pass the baseline, since different fonts have
* different top edges. It looks stupid when the baseline of "normal"
* text jumps up and down when a "strange" character is just added
* to the end of the text */
y = area->y +
area->height / 2 +
/* go to great lengths to center the text while keeping the baseline in
* the same place */
t->font->pango_descent / PANGO_SCALE;
font_calculate_baseline(t->font, area->height);
#endif
/* the +2 and -4 leave a small blank edge on the sides */
x = area->x + 2;