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) 2003-2007 Dana 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 static void measure_font(const RrInstance
*inst
, RrFont
*f
)
36 PangoFontMetrics
*metrics
;
37 static PangoLanguage
*lang
= NULL
;
40 #if PANGO_VERSION_MAJOR > 1 || \
41 (PANGO_VERSION_MAJOR == 1 && PANGO_VERSION_MINOR >= 16)
42 lang
= pango_language_get_default();
45 /* get the default language from the locale
46 (based on gtk_get_default_language in gtkmain.c) */
47 locale
= g_strdup(setlocale(LC_CTYPE
, NULL
));
48 if ((p
= strchr(locale
, '.'))) *p
= '\0'; /* strip off the . */
49 if ((p
= strchr(locale
, '@'))) *p
= '\0'; /* strip off the @ */
50 lang
= pango_language_from_string(locale
);
55 /* measure the ascent and descent */
56 metrics
= pango_context_get_metrics(inst
->pango
, f
->font_desc
, lang
);
57 f
->ascent
= pango_font_metrics_get_ascent(metrics
);
58 f
->descent
= pango_font_metrics_get_descent(metrics
);
59 pango_font_metrics_unref(metrics
);
63 RrFont
*RrFontOpen(const RrInstance
*inst
, const gchar
*name
, gint size
,
64 RrFontWeight weight
, RrFontSlant slant
)
69 PangoAttrList
*attrlist
;
71 out
= g_new(RrFont
, 1);
74 out
->font_desc
= pango_font_description_new();
75 out
->layout
= pango_layout_new(inst
->pango
);
76 out
->shortcut_underline
= pango_attr_underline_new(PANGO_UNDERLINE_LOW
);
77 out
->shortcut_underline
->start_index
= 0;
78 out
->shortcut_underline
->end_index
= 0;
80 attrlist
= pango_attr_list_new();
81 /* shortcut_underline is owned by the attrlist */
82 pango_attr_list_insert(attrlist
, out
->shortcut_underline
);
83 /* the attributes are owned by the layout */
84 pango_layout_set_attributes(out
->layout
, attrlist
);
85 pango_attr_list_unref(attrlist
);
88 case RR_FONTWEIGHT_LIGHT
: pweight
= PANGO_WEIGHT_LIGHT
; break;
89 case RR_FONTWEIGHT_NORMAL
: pweight
= PANGO_WEIGHT_NORMAL
; break;
90 case RR_FONTWEIGHT_SEMIBOLD
: pweight
= PANGO_WEIGHT_SEMIBOLD
; break;
91 case RR_FONTWEIGHT_BOLD
: pweight
= PANGO_WEIGHT_BOLD
; break;
92 case RR_FONTWEIGHT_ULTRABOLD
: pweight
= PANGO_WEIGHT_ULTRABOLD
; break;
93 default: g_assert_not_reached();
97 case RR_FONTSLANT_NORMAL
: pstyle
= PANGO_STYLE_NORMAL
; break;
98 case RR_FONTSLANT_ITALIC
: pstyle
= PANGO_STYLE_ITALIC
; break;
99 case RR_FONTSLANT_OBLIQUE
: pstyle
= PANGO_STYLE_OBLIQUE
; break;
100 default: g_assert_not_reached();
104 pango_font_description_set_family(out
->font_desc
, name
);
105 pango_font_description_set_weight(out
->font_desc
, pweight
);
106 pango_font_description_set_style(out
->font_desc
, pstyle
);
107 pango_font_description_set_size(out
->font_desc
, size
* PANGO_SCALE
);
109 /* setup the layout */
110 pango_layout_set_font_description(out
->layout
, out
->font_desc
);
111 pango_layout_set_single_paragraph_mode(out
->layout
, TRUE
);
112 pango_layout_set_wrap(out
->layout
, PANGO_WRAP_WORD_CHAR
);
114 /* get the ascent and descent */
115 measure_font(inst
, out
);
120 RrFont
*RrFontOpenDefault(const RrInstance
*inst
)
122 return RrFontOpen(inst
, RrDefaultFontFamily
, RrDefaultFontSize
,
123 RrDefaultFontWeight
, RrDefaultFontSlant
);
126 void RrFontRef(RrFont
*f
)
131 void RrFontClose(RrFont
*f
)
135 g_object_unref(f
->layout
);
136 pango_font_description_free(f
->font_desc
);
142 static void font_measure_full(const RrFont
*f
, const gchar
*str
,
143 gint
*x
, gint
*y
, gint shadow_x
, gint shadow_y
,
148 pango_layout_set_text(f
->layout
, str
, -1);
149 pango_layout_set_width(f
->layout
,
150 (maxwidth
<= 0 ? -1 : maxwidth
* PANGO_SCALE
));
152 /* pango_layout_get_pixel_extents lies! this is the right way to get the
153 size of the text's area */
154 pango_layout_get_extents(f
->layout
, NULL
, &rect
);
155 #if PANGO_VERSION_MAJOR > 1 || \
156 (PANGO_VERSION_MAJOR == 1 && PANGO_VERSION_MINOR >= 16)
157 /* pass the logical rect as the ink rect, this is on purpose so we get the
158 full area for the text */
159 pango_extents_to_pixels(&rect
, NULL
);
161 rect
.width
= (rect
.width
+ PANGO_SCALE
- 1) / PANGO_SCALE
;
162 rect
.height
= (rect
.height
+ PANGO_SCALE
- 1) / PANGO_SCALE
;
164 *x
= rect
.width
+ ABS(shadow_x
) + 4 /* we put a 2 px edge on each side */;
165 *y
= rect
.height
+ ABS(shadow_y
);
168 RrSize
*RrFontMeasureString(const RrFont
*f
, const gchar
*str
,
169 gint shadow_x
, gint shadow_y
, gint maxwidth
)
172 size
= g_new(RrSize
, 1);
173 font_measure_full(f
, str
, &size
->width
, &size
->height
, shadow_x
, shadow_y
,
178 gint
RrFontHeight(const RrFont
*f
, gint shadow_y
)
180 return (f
->ascent
+ f
->descent
) / PANGO_SCALE
+ ABS(shadow_y
);
183 static inline int font_calculate_baseline(RrFont
*f
, gint height
)
185 /* For my own reference:
187 * ^space/2 ^height ^baseline
190 * | | | | |_ _____ _| |_ _ _
191 * | | | | _/ -_) \ / _| || |
192 * | v_________v \__\___/_\_\\__|\_, |
198 return (((height
* PANGO_SCALE
) /* height of the space in pango units */
199 - (f
->ascent
+ f
->descent
)) /* minus space taken up by text */
200 / 2 /* divided by two -> half of the empty space (this is the top
202 + f
->ascent
) /* now move down to the baseline */
203 / PANGO_SCALE
; /* back to pixels */
206 void RrFontDraw(XftDraw
*d
, RrTextureText
*t
, RrRect
*area
)
212 PangoAttrList
*attrlist
;
213 PangoEllipsizeMode ell
;
215 /* center the text vertically
216 We do this centering based on the 'baseline' since different fonts have
217 different top edges. It looks bad when the whole string is moved when 1
218 character from a non-default language is included in the string */
220 font_calculate_baseline(t
->font
, area
->height
);
222 /* the +2 and -4 leave a small blank edge on the sides */
227 switch (t
->ellipsize
) {
228 case RR_ELLIPSIZE_NONE
:
229 ell
= PANGO_ELLIPSIZE_NONE
;
231 case RR_ELLIPSIZE_START
:
232 ell
= PANGO_ELLIPSIZE_START
;
234 case RR_ELLIPSIZE_MIDDLE
:
235 ell
= PANGO_ELLIPSIZE_MIDDLE
;
237 case RR_ELLIPSIZE_END
:
238 ell
= PANGO_ELLIPSIZE_END
;
242 pango_layout_set_text(t
->font
->layout
, t
->string
, -1);
243 pango_layout_set_width(t
->font
->layout
, w
* PANGO_SCALE
);
244 pango_layout_set_ellipsize(t
->font
->layout
, ell
);
246 /* * * end of setting up the layout * * */
248 pango_layout_get_pixel_extents(t
->font
->layout
, NULL
, &rect
);
251 /* pango_layout_set_alignment doesn't work with
252 pango_xft_render_layout_line */
253 switch (t
->justify
) {
254 case RR_JUSTIFY_LEFT
:
256 case RR_JUSTIFY_RIGHT
:
259 case RR_JUSTIFY_CENTER
:
264 if (t
->shadow_offset_x
|| t
->shadow_offset_y
) {
265 c
.color
.red
= t
->shadow_color
->r
| t
->shadow_color
->r
<< 8;
266 c
.color
.green
= t
->shadow_color
->g
| t
->shadow_color
->g
<< 8;
267 c
.color
.blue
= t
->shadow_color
->b
| t
->shadow_color
->b
<< 8;
268 c
.color
.alpha
= 0xffff * t
->shadow_alpha
/ 255;
269 c
.pixel
= t
->shadow_color
->pixel
;
272 pango_xft_render_layout_line
273 (d
, &c
, pango_layout_get_line(t
->font
->layout
, 0),
274 (x
+ t
->shadow_offset_x
) * PANGO_SCALE
,
275 (y
+ t
->shadow_offset_y
) * PANGO_SCALE
);
278 c
.color
.red
= t
->color
->r
| t
->color
->r
<< 8;
279 c
.color
.green
= t
->color
->g
| t
->color
->g
<< 8;
280 c
.color
.blue
= t
->color
->b
| t
->color
->b
<< 8;
281 c
.color
.alpha
= 0xff | 0xff << 8; /* fully opaque text */
282 c
.pixel
= t
->color
->pixel
;
285 const gchar
*s
= t
->string
+ t
->shortcut_pos
;
287 t
->font
->shortcut_underline
->start_index
= t
->shortcut_pos
;
288 t
->font
->shortcut_underline
->end_index
= t
->shortcut_pos
+
289 (g_utf8_next_char(s
) - s
);
291 /* the attributes are owned by the layout.
292 re-add the attributes to the layout after changing the
293 start and end index */
294 attrlist
= pango_layout_get_attributes(t
->font
->layout
);
295 pango_attr_list_ref(attrlist
);
296 pango_layout_set_attributes(t
->font
->layout
, attrlist
);
297 pango_attr_list_unref(attrlist
);
300 /* layout_line() uses y to specify the baseline
301 The line doesn't need to be freed, it's a part of the layout */
302 pango_xft_render_layout_line
303 (d
, &c
, pango_layout_get_line(t
->font
->layout
, 0),
304 x
* PANGO_SCALE
, y
* PANGO_SCALE
);
307 t
->font
->shortcut_underline
->start_index
= 0;
308 t
->font
->shortcut_underline
->end_index
= 0;
309 /* the attributes are owned by the layout.
310 re-add the attributes to the layout after changing the
311 start and end index */
312 attrlist
= pango_layout_get_attributes(t
->font
->layout
);
313 pango_attr_list_ref(attrlist
);
314 pango_layout_set_attributes(t
->font
->layout
, attrlist
);
315 pango_attr_list_unref(attrlist
);