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
;
39 /* get the default language from the locale
40 (based on gtk_get_default_language in gtkmain.c) */
41 locale
= g_strdup(setlocale(LC_CTYPE
, NULL
));
42 if ((p
= strchr(locale
, '.'))) *p
= '\0'; /* strip off the . */
43 if ((p
= strchr(locale
, '@'))) *p
= '\0'; /* strip off the @ */
45 /* measure the ascent and descent */
46 metrics
= pango_context_get_metrics(inst
->pango
, f
->font_desc
,
47 pango_language_from_string(locale
));
48 f
->ascent
= pango_font_metrics_get_ascent(metrics
);
49 f
->descent
= pango_font_metrics_get_descent(metrics
);
50 pango_font_metrics_unref(metrics
);
55 RrFont
*RrFontOpen(const RrInstance
*inst
, const gchar
*name
, gint size
,
56 RrFontWeight weight
, RrFontSlant slant
)
61 PangoAttrList
*attrlist
;
63 out
= g_new(RrFont
, 1);
66 out
->font_desc
= pango_font_description_new();
67 out
->layout
= pango_layout_new(inst
->pango
);
68 out
->shortcut_underline
= pango_attr_underline_new(PANGO_UNDERLINE_LOW
);
69 out
->shortcut_underline
->start_index
= 0;
70 out
->shortcut_underline
->end_index
= 0;
72 attrlist
= pango_attr_list_new();
73 /* shortcut_underline is owned by the attrlist */
74 pango_attr_list_insert(attrlist
, out
->shortcut_underline
);
75 /* the attributes are owned by the layout */
76 pango_layout_set_attributes(out
->layout
, attrlist
);
77 pango_attr_list_unref(attrlist
);
80 case RR_FONTWEIGHT_LIGHT
: pweight
= PANGO_WEIGHT_LIGHT
; break;
81 case RR_FONTWEIGHT_NORMAL
: pweight
= PANGO_WEIGHT_NORMAL
; break;
82 case RR_FONTWEIGHT_SEMIBOLD
: pweight
= PANGO_WEIGHT_SEMIBOLD
; break;
83 case RR_FONTWEIGHT_BOLD
: pweight
= PANGO_WEIGHT_BOLD
; break;
84 case RR_FONTWEIGHT_ULTRABOLD
: pweight
= PANGO_WEIGHT_ULTRABOLD
; break;
85 default: g_assert_not_reached();
89 case RR_FONTSLANT_NORMAL
: pstyle
= PANGO_STYLE_NORMAL
; break;
90 case RR_FONTSLANT_ITALIC
: pstyle
= PANGO_STYLE_ITALIC
; break;
91 case RR_FONTSLANT_OBLIQUE
: pstyle
= PANGO_STYLE_OBLIQUE
; break;
92 default: g_assert_not_reached();
96 pango_font_description_set_family(out
->font_desc
, name
);
97 pango_font_description_set_weight(out
->font_desc
, pweight
);
98 pango_font_description_set_style(out
->font_desc
, pstyle
);
99 pango_font_description_set_size(out
->font_desc
, size
* PANGO_SCALE
);
101 /* setup the layout */
102 pango_layout_set_font_description(out
->layout
, out
->font_desc
);
103 pango_layout_set_single_paragraph_mode(out
->layout
, TRUE
);
104 pango_layout_set_ellipsize(out
->layout
, PANGO_ELLIPSIZE_MIDDLE
);
106 /* get the ascent and descent */
107 measure_font(inst
, out
);
112 RrFont
*RrFontOpenDefault(const RrInstance
*inst
)
114 return RrFontOpen(inst
, RrDefaultFontFamily
, RrDefaultFontSize
,
115 RrDefaultFontWeight
, RrDefaultFontSlant
);
118 void RrFontRef(RrFont
*f
)
123 void RrFontClose(RrFont
*f
)
127 g_object_unref(f
->layout
);
128 pango_font_description_free(f
->font_desc
);
134 static void font_measure_full(const RrFont
*f
, const gchar
*str
,
135 gint
*x
, gint
*y
, gint shadow_x
, gint shadow_y
)
139 pango_layout_set_text(f
->layout
, str
, -1);
140 pango_layout_set_width(f
->layout
, -1);
141 pango_layout_get_pixel_extents(f
->layout
, NULL
, &rect
);
142 *x
= rect
.width
+ ABS(shadow_x
) + 4 /* we put a 2 px edge on each side */;
143 *y
= rect
.height
+ ABS(shadow_y
);
146 RrSize
*RrFontMeasureString(const RrFont
*f
, const gchar
*str
,
147 gint shadow_x
, gint shadow_y
)
150 size
= g_new(RrSize
, 1);
151 font_measure_full(f
, str
, &size
->width
, &size
->height
, shadow_x
, shadow_y
);
155 gint
RrFontHeight(const RrFont
*f
, gint shadow_y
)
157 return (f
->ascent
+ f
->descent
) / PANGO_SCALE
+ ABS(shadow_y
);
160 static inline int font_calculate_baseline(RrFont
*f
, gint height
)
162 /* For my own reference:
164 * ^space/2 ^height ^baseline
167 * | | | | |_ _____ _| |_ _ _
168 * | | | | _/ -_) \ / _| || |
169 * | v_________v \__\___/_\_\\__|\_, |
175 return (((height
* PANGO_SCALE
) /* height of the space in pango units */
176 - (f
->ascent
+ f
->descent
)) /* minus space taken up by text */
177 / 2 /* divided by two -> half of the empty space (this is the top
179 + f
->ascent
) /* now move down to the baseline */
180 / PANGO_SCALE
; /* back to pixels */
183 void RrFontDraw(XftDraw
*d
, RrTextureText
*t
, RrRect
*area
)
189 PangoAttrList
*attrlist
;
191 /* center the text vertically
192 We do this centering based on the 'baseline' since different fonts have
193 different top edges. It looks bad when the whole string is moved when 1
194 character from a non-default language is included in the string */
196 font_calculate_baseline(t
->font
, area
->height
);
198 /* the +2 and -4 leave a small blank edge on the sides */
203 pango_layout_set_text(t
->font
->layout
, t
->string
, -1);
204 pango_layout_set_width(t
->font
->layout
, w
* PANGO_SCALE
);
206 /* * * end of setting up the layout * * */
208 pango_layout_get_pixel_extents(t
->font
->layout
, NULL
, &rect
);
211 /* pango_layout_set_alignment doesn't work with
212 pango_xft_render_layout_line */
213 switch (t
->justify
) {
214 case RR_JUSTIFY_LEFT
:
216 case RR_JUSTIFY_RIGHT
:
219 case RR_JUSTIFY_CENTER
:
224 if (t
->shadow_offset_x
|| t
->shadow_offset_y
) {
225 c
.color
.red
= t
->shadow_color
->r
| t
->shadow_color
->r
<< 8;
226 c
.color
.green
= t
->shadow_color
->g
| t
->shadow_color
->g
<< 8;
227 c
.color
.blue
= t
->shadow_color
->b
| t
->shadow_color
->b
<< 8;
228 c
.color
.alpha
= 0xffff * t
->shadow_alpha
/ 255;
229 c
.pixel
= t
->shadow_color
->pixel
;
232 pango_xft_render_layout_line
233 (d
, &c
, pango_layout_get_line(t
->font
->layout
, 0),
234 (x
+ t
->shadow_offset_x
) * PANGO_SCALE
,
235 (y
+ t
->shadow_offset_y
) * PANGO_SCALE
);
238 c
.color
.red
= t
->color
->r
| t
->color
->r
<< 8;
239 c
.color
.green
= t
->color
->g
| t
->color
->g
<< 8;
240 c
.color
.blue
= t
->color
->b
| t
->color
->b
<< 8;
241 c
.color
.alpha
= 0xff | 0xff << 8; /* fully opaque text */
242 c
.pixel
= t
->color
->pixel
;
245 const gchar
*c
= t
->string
+ t
->shortcut_pos
;
247 t
->font
->shortcut_underline
->start_index
= t
->shortcut_pos
;
248 t
->font
->shortcut_underline
->end_index
= t
->shortcut_pos
+
249 (g_utf8_next_char(c
) - c
);
251 /* the attributes are owned by the layout.
252 re-add the attributes to the layout after changing the
253 start and end index */
254 attrlist
= pango_layout_get_attributes(t
->font
->layout
);
255 pango_attr_list_ref(attrlist
);
256 pango_layout_set_attributes(t
->font
->layout
, attrlist
);
257 pango_attr_list_unref(attrlist
);
260 /* layout_line() uses y to specify the baseline
261 The line doesn't need to be freed, it's a part of the layout */
262 pango_xft_render_layout_line
263 (d
, &c
, pango_layout_get_line(t
->font
->layout
, 0),
264 x
* PANGO_SCALE
, y
* PANGO_SCALE
);
267 t
->font
->shortcut_underline
->start_index
= 0;
268 t
->font
->shortcut_underline
->end_index
= 0;
269 /* the attributes are owned by the layout.
270 re-add the attributes to the layout after changing the
271 start and end index */
272 attrlist
= pango_layout_get_attributes(t
->font
->layout
);
273 pango_attr_list_ref(attrlist
);
274 pango_layout_set_attributes(t
->font
->layout
, attrlist
);
275 pango_attr_list_unref(attrlist
);