1 /* -*- indent-tabs-mode: nil; tab-width: 4; c-basic-offset: 4; -*-
3 font.c for the Openbox window manager
4 Copyright (c) 2006 Mikael Magnusson
5 Copyright (c) 2003 Ben Jansens
6 Copyright (c) 2003 Derek Foreman
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 See the COPYING file for a copy of the GNU General Public License.
34 #define OB_SHADOW "shadow"
35 #define OB_SHADOW_OFFSET "shadowoffset"
36 #define OB_SHADOW_ALPHA "shadowtint"
38 FcObjectType objs
[] = {
39 { OB_SHADOW
, FcTypeBool
},
40 { OB_SHADOW_OFFSET
, FcTypeInteger
},
41 { OB_SHADOW_ALPHA
, FcTypeInteger
}
44 static gboolean started
= FALSE
;
46 static void font_startup(void)
49 g_warning(_("Couldn't initialize Xft."));
53 /* Here we are teaching xft about the shadow, shadowoffset & shadowtint */
54 FcNameRegisterObjectTypes(objs
, (sizeof(objs
) / sizeof(objs
[0])));
57 static void measure_font(const RrInstance
*inst
, RrFont
*f
)
59 PangoFontMetrics
*metrics
;
62 /* get the default language from the locale
63 (based on gtk_get_default_language in gtkmain.c) */
64 locale
= g_strdup(setlocale(LC_CTYPE
, NULL
));
65 if ((p
= strchr(locale
, '.'))) *p
= '\0'; /* strip off the . */
66 if ((p
= strchr(locale
, '@'))) *p
= '\0'; /* strip off the @ */
68 /* measure the ascent and descent */
69 metrics
= pango_context_get_metrics(inst
->pango
, f
->font_desc
,
70 pango_language_from_string(locale
));
71 f
->ascent
= pango_font_metrics_get_ascent(metrics
);
72 f
->descent
= pango_font_metrics_get_descent(metrics
);
73 pango_font_metrics_unref(metrics
);
78 static RrFont
*openfont(const RrInstance
*inst
, gchar
*fontstring
)
80 /* This function is called for each font in the theme file. */
81 /* It returns a pointer to a RrFont struct after filling it. */
88 if (!(pat
= XftNameParse(fontstring
)))
91 out
= g_new(RrFont
, 1);
93 out
->font_desc
= pango_font_description_new();
94 out
->layout
= pango_layout_new(inst
->pango
);
96 /* get the data from the parsed xft string */
99 if (FcPatternGetString(pat
, "family", 0,
100 (FcChar8
**)&sval
) == FcResultMatch
)
101 pango_font_description_set_family(out
->font_desc
, sval
);
104 if (FcPatternGetInteger(pat
, "weight", 0, &ival
) == FcResultMatch
) {
105 if (ival
== FC_WEIGHT_LIGHT
)
106 pango_font_description_set_weight(out
->font_desc
,
108 else if (ival
== FC_WEIGHT_DEMIBOLD
)
109 pango_font_description_set_weight(out
->font_desc
,
110 PANGO_WEIGHT_SEMIBOLD
);
111 else if (ival
== FC_WEIGHT_BOLD
)
112 pango_font_description_set_weight(out
->font_desc
,
114 else if (ival
== FC_WEIGHT_BLACK
)
115 pango_font_description_set_weight(out
->font_desc
,
116 PANGO_WEIGHT_ULTRABOLD
);
119 if (FcPatternGetInteger(pat
, "slant", 0, &ival
) == FcResultMatch
) {
120 if (ival
== FC_SLANT_ITALIC
)
121 pango_font_description_set_style(out
->font_desc
,
123 else if (ival
== FC_SLANT_OBLIQUE
)
124 pango_font_description_set_style(out
->font_desc
,
125 PANGO_STYLE_OBLIQUE
);
129 if (FcPatternGetInteger(pat
, "size", 0, &ival
) == FcResultMatch
)
130 pango_font_description_set_size(out
->font_desc
, ival
* PANGO_SCALE
);
131 else if (FcPatternGetInteger(pat
, "pixelsize", 0, &ival
) == FcResultMatch
)
132 pango_font_description_set_absolute_size(out
->font_desc
,
135 if (FcPatternGetBool(pat
, OB_SHADOW
, 0, &out
->shadow
) != FcResultMatch
)
138 if (FcPatternGetInteger(pat
, OB_SHADOW_OFFSET
, 0, &out
->offset
) !=
142 if (FcPatternGetInteger(pat
, OB_SHADOW_ALPHA
, 0, &tint
) != FcResultMatch
)
144 if (tint
> 100) tint
= 100;
145 else if (tint
< -100) tint
= -100;
148 /* setup the layout */
149 pango_layout_set_font_description(out
->layout
, out
->font_desc
);
150 pango_layout_set_single_paragraph_mode(out
->layout
, TRUE
);
151 pango_layout_set_ellipsize(out
->layout
, PANGO_ELLIPSIZE_MIDDLE
);
153 /* get the ascent and descent */
154 measure_font(inst
, out
);
159 RrFont
*RrFontOpen(const RrInstance
*inst
, gchar
*fontstring
)
168 if ((out
= openfont(inst
, fontstring
)))
170 g_warning(_("Unable to load font: %s\n"), fontstring
);
171 g_warning(_("Trying fallback font: %s\n"), "sans");
173 if ((out
= openfont(inst
, "sans")))
175 g_warning(_("Unable to load font: %s\n"), "sans");
180 void RrFontClose(RrFont
*f
)
183 g_object_unref(f
->layout
);
184 pango_font_description_free(f
->font_desc
);
189 static void font_measure_full(const RrFont
*f
, const gchar
*str
,
194 pango_layout_set_text(f
->layout
, str
, -1);
195 pango_layout_set_width(f
->layout
, -1);
196 pango_layout_get_pixel_extents(f
->layout
, NULL
, &rect
);
197 *x
= rect
.width
+ (f
->shadow
? ABS(f
->offset
) : 0);
198 *y
= rect
.height
+ (f
->shadow
? ABS(f
->offset
) : 0);
201 RrSize
*RrFontMeasureString(const RrFont
*f
, const gchar
*str
)
204 size
= g_new(RrSize
, 1);
205 font_measure_full(f
, str
, &size
->width
, &size
->height
);
209 gint
RrFontHeight(const RrFont
*f
)
211 return (f
->ascent
+ f
->descent
) / PANGO_SCALE
+
212 (f
->shadow
? f
->offset
: 0);
215 static inline int font_calculate_baseline(RrFont
*f
, gint height
)
217 /* For my own reference:
219 * ^space/2 ^height ^baseline
222 * | | | | |_ _____ _| |_ _ _
223 * | | | | _/ -_) \ / _| || |
224 * | v_________v \__\___/_\_\\__|\_, |
230 return (((height
* PANGO_SCALE
) /* height of the space in pango units */
231 - (f
->ascent
+ f
->descent
)) /* minus space taken up by text */
232 / 2 /* divided by two -> half of the empty space (this is the top
234 + f
->ascent
) /* now move down to the baseline */
235 / PANGO_SCALE
; /* back to pixels */
238 void RrFontDraw(XftDraw
*d
, RrTextureText
*t
, RrRect
*area
)
245 /* center the text vertically
246 We do this centering based on the 'baseline' since different fonts have
247 different top edges. It looks bad when the whole string is moved when 1
248 character from a non-default language is included in the string */
250 font_calculate_baseline(t
->font
, area
->height
);
252 /* the +2 and -4 leave a small blank edge on the sides */
257 pango_layout_set_text(t
->font
->layout
, t
->string
, -1);
258 pango_layout_set_width(t
->font
->layout
, w
* PANGO_SCALE
);
260 pango_layout_get_pixel_extents(t
->font
->layout
, NULL
, &rect
);
263 /* pango_layout_set_alignment doesn't work with
264 pango_xft_render_layout_line */
265 switch (t
->justify
) {
266 case RR_JUSTIFY_LEFT
:
268 case RR_JUSTIFY_RIGHT
:
271 case RR_JUSTIFY_CENTER
:
276 if (t
->font
->shadow
) {
277 if (t
->font
->tint
>= 0) {
281 c
.color
.alpha
= 0xffff * t
->font
->tint
/ 100;
282 c
.pixel
= BlackPixel(RrDisplay(t
->font
->inst
),
283 RrScreen(t
->font
->inst
));
285 c
.color
.red
= 0xffff;
286 c
.color
.green
= 0xffff;
287 c
.color
.blue
= 0xffff;
288 c
.color
.alpha
= 0xffff * -t
->font
->tint
/ 100;
289 c
.pixel
= WhitePixel(RrDisplay(t
->font
->inst
),
290 RrScreen(t
->font
->inst
));
293 pango_xft_render_layout_line
294 (d
, &c
, pango_layout_get_line(t
->font
->layout
, 0),
295 (x
+ t
->font
->offset
) * PANGO_SCALE
,
296 (y
+ t
->font
->offset
) * PANGO_SCALE
);
299 c
.color
.red
= t
->color
->r
| t
->color
->r
<< 8;
300 c
.color
.green
= t
->color
->g
| t
->color
->g
<< 8;
301 c
.color
.blue
= t
->color
->b
| t
->color
->b
<< 8;
302 c
.color
.alpha
= 0xff | 0xff << 8; /* fully opaque text */
303 c
.pixel
= t
->color
->pixel
;
305 /* layout_line() uses y to specify the baseline
306 The line doesn't need to be freed, it's a part of the layout */
307 pango_xft_render_layout_line
308 (d
, &c
, pango_layout_get_line(t
->font
->layout
, 0),
309 x
* PANGO_SCALE
, y
* PANGO_SCALE
);