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_CHECK(1,16,0)
41 lang
= pango_language_get_default();
44 /* get the default language from the locale
45 (based on gtk_get_default_language in gtkmain.c) */
46 locale
= g_strdup(setlocale(LC_CTYPE
, NULL
));
47 if ((p
= strchr(locale
, '.'))) *p
= '\0'; /* strip off the . */
48 if ((p
= strchr(locale
, '@'))) *p
= '\0'; /* strip off the @ */
49 lang
= pango_language_from_string(locale
);
54 /* measure the ascent and descent */
55 metrics
= pango_context_get_metrics(inst
->pango
, f
->font_desc
, lang
);
56 f
->ascent
= pango_font_metrics_get_ascent(metrics
);
57 f
->descent
= pango_font_metrics_get_descent(metrics
);
58 pango_font_metrics_unref(metrics
);
62 RrFont
*RrFontOpen(const RrInstance
*inst
, const gchar
*name
, gint size
,
63 RrFontWeight weight
, RrFontSlant slant
)
68 PangoAttrList
*attrlist
;
70 out
= g_new(RrFont
, 1);
73 out
->font_desc
= pango_font_description_new();
74 out
->layout
= pango_layout_new(inst
->pango
);
75 out
->shortcut_underline
= pango_attr_underline_new(PANGO_UNDERLINE_LOW
);
76 out
->shortcut_underline
->start_index
= 0;
77 out
->shortcut_underline
->end_index
= 0;
79 attrlist
= pango_attr_list_new();
80 /* shortcut_underline is owned by the attrlist */
81 pango_attr_list_insert(attrlist
, out
->shortcut_underline
);
82 /* the attributes are owned by the layout */
83 pango_layout_set_attributes(out
->layout
, attrlist
);
84 pango_attr_list_unref(attrlist
);
87 case RR_FONTWEIGHT_LIGHT
: pweight
= PANGO_WEIGHT_LIGHT
; break;
88 case RR_FONTWEIGHT_NORMAL
: pweight
= PANGO_WEIGHT_NORMAL
; break;
89 case RR_FONTWEIGHT_SEMIBOLD
: pweight
= PANGO_WEIGHT_SEMIBOLD
; break;
90 case RR_FONTWEIGHT_BOLD
: pweight
= PANGO_WEIGHT_BOLD
; break;
91 case RR_FONTWEIGHT_ULTRABOLD
: pweight
= PANGO_WEIGHT_ULTRABOLD
; break;
92 default: g_assert_not_reached();
96 case RR_FONTSLANT_NORMAL
: pstyle
= PANGO_STYLE_NORMAL
; break;
97 case RR_FONTSLANT_ITALIC
: pstyle
= PANGO_STYLE_ITALIC
; break;
98 case RR_FONTSLANT_OBLIQUE
: pstyle
= PANGO_STYLE_OBLIQUE
; break;
99 default: g_assert_not_reached();
103 pango_font_description_set_family(out
->font_desc
, name
);
104 pango_font_description_set_weight(out
->font_desc
, pweight
);
105 pango_font_description_set_style(out
->font_desc
, pstyle
);
106 pango_font_description_set_size(out
->font_desc
, size
* PANGO_SCALE
);
108 /* setup the layout */
109 pango_layout_set_font_description(out
->layout
, out
->font_desc
);
110 pango_layout_set_single_paragraph_mode(out
->layout
, TRUE
);
111 pango_layout_set_ellipsize(out
->layout
, PANGO_ELLIPSIZE_MIDDLE
);
113 /* get the ascent and descent */
114 measure_font(inst
, out
);
119 RrFont
*RrFontOpenDefault(const RrInstance
*inst
)
121 return RrFontOpen(inst
, RrDefaultFontFamily
, RrDefaultFontSize
,
122 RrDefaultFontWeight
, RrDefaultFontSlant
);
125 void RrFontRef(RrFont
*f
)
130 void RrFontClose(RrFont
*f
)
134 g_object_unref(f
->layout
);
135 pango_font_description_free(f
->font_desc
);
141 static void font_measure_full(const RrFont
*f
, const gchar
*str
,
142 gint
*x
, gint
*y
, gint shadow_x
, gint shadow_y
)
146 pango_layout_set_text(f
->layout
, str
, -1);
147 pango_layout_set_width(f
->layout
, -1);
148 pango_layout_get_pixel_extents(f
->layout
, NULL
, &rect
);
149 *x
= rect
.width
+ ABS(shadow_x
) + 4 /* we put a 2 px edge on each side */;
150 *y
= rect
.height
+ ABS(shadow_y
);
153 RrSize
*RrFontMeasureString(const RrFont
*f
, const gchar
*str
,
154 gint shadow_x
, gint shadow_y
)
157 size
= g_new(RrSize
, 1);
158 font_measure_full(f
, str
, &size
->width
, &size
->height
, shadow_x
, shadow_y
);
162 gint
RrFontHeight(const RrFont
*f
, gint shadow_y
)
164 return (f
->ascent
+ f
->descent
) / PANGO_SCALE
+ ABS(shadow_y
);
167 static inline int font_calculate_baseline(RrFont
*f
, gint height
)
169 /* For my own reference:
171 * ^space/2 ^height ^baseline
174 * | | | | |_ _____ _| |_ _ _
175 * | | | | _/ -_) \ / _| || |
176 * | v_________v \__\___/_\_\\__|\_, |
182 return (((height
* PANGO_SCALE
) /* height of the space in pango units */
183 - (f
->ascent
+ f
->descent
)) /* minus space taken up by text */
184 / 2 /* divided by two -> half of the empty space (this is the top
186 + f
->ascent
) /* now move down to the baseline */
187 / PANGO_SCALE
; /* back to pixels */
190 void RrFontDraw(XftDraw
*d
, RrTextureText
*t
, RrRect
*area
)
196 PangoAttrList
*attrlist
;
198 /* center the text vertically
199 We do this centering based on the 'baseline' since different fonts have
200 different top edges. It looks bad when the whole string is moved when 1
201 character from a non-default language is included in the string */
203 font_calculate_baseline(t
->font
, area
->height
);
205 /* the +2 and -4 leave a small blank edge on the sides */
210 pango_layout_set_text(t
->font
->layout
, t
->string
, -1);
211 pango_layout_set_width(t
->font
->layout
, w
* PANGO_SCALE
);
213 /* * * end of setting up the layout * * */
215 pango_layout_get_pixel_extents(t
->font
->layout
, NULL
, &rect
);
218 /* pango_layout_set_alignment doesn't work with
219 pango_xft_render_layout_line */
220 switch (t
->justify
) {
221 case RR_JUSTIFY_LEFT
:
223 case RR_JUSTIFY_RIGHT
:
226 case RR_JUSTIFY_CENTER
:
231 if (t
->shadow_offset_x
|| t
->shadow_offset_y
) {
232 c
.color
.red
= t
->shadow_color
->r
| t
->shadow_color
->r
<< 8;
233 c
.color
.green
= t
->shadow_color
->g
| t
->shadow_color
->g
<< 8;
234 c
.color
.blue
= t
->shadow_color
->b
| t
->shadow_color
->b
<< 8;
235 c
.color
.alpha
= 0xffff * t
->shadow_alpha
/ 255;
236 c
.pixel
= t
->shadow_color
->pixel
;
239 pango_xft_render_layout_line
240 (d
, &c
, pango_layout_get_line(t
->font
->layout
, 0),
241 (x
+ t
->shadow_offset_x
) * PANGO_SCALE
,
242 (y
+ t
->shadow_offset_y
) * PANGO_SCALE
);
245 c
.color
.red
= t
->color
->r
| t
->color
->r
<< 8;
246 c
.color
.green
= t
->color
->g
| t
->color
->g
<< 8;
247 c
.color
.blue
= t
->color
->b
| t
->color
->b
<< 8;
248 c
.color
.alpha
= 0xff | 0xff << 8; /* fully opaque text */
249 c
.pixel
= t
->color
->pixel
;
252 const gchar
*c
= t
->string
+ t
->shortcut_pos
;
254 t
->font
->shortcut_underline
->start_index
= t
->shortcut_pos
;
255 t
->font
->shortcut_underline
->end_index
= t
->shortcut_pos
+
256 (g_utf8_next_char(c
) - c
);
258 /* the attributes are owned by the layout.
259 re-add the attributes to the layout after changing the
260 start and end index */
261 attrlist
= pango_layout_get_attributes(t
->font
->layout
);
262 pango_attr_list_ref(attrlist
);
263 pango_layout_set_attributes(t
->font
->layout
, attrlist
);
264 pango_attr_list_unref(attrlist
);
267 /* layout_line() uses y to specify the baseline
268 The line doesn't need to be freed, it's a part of the layout */
269 pango_xft_render_layout_line
270 (d
, &c
, pango_layout_get_line(t
->font
->layout
, 0),
271 x
* PANGO_SCALE
, y
* PANGO_SCALE
);
274 t
->font
->shortcut_underline
->start_index
= 0;
275 t
->font
->shortcut_underline
->end_index
= 0;
276 /* the attributes are owned by the layout.
277 re-add the attributes to the layout after changing the
278 start and end index */
279 attrlist
= pango_layout_get_attributes(t
->font
->layout
);
280 pango_attr_list_ref(attrlist
);
281 pango_layout_set_attributes(t
->font
->layout
, attrlist
);
282 pango_attr_list_unref(attrlist
);