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
);
70 attrlist
= pango_attr_list_new();
71 /* shortcut_underline is owned by the attrlist */
72 pango_attr_list_insert(attrlist
, out
->shortcut_underline
);
73 /* the attributes are owned by the layout */
74 pango_layout_set_attributes(out
->layout
, attrlist
);
75 pango_attr_list_unref(attrlist
);
78 case RR_FONTWEIGHT_LIGHT
: pweight
= PANGO_WEIGHT_LIGHT
; break;
79 case RR_FONTWEIGHT_NORMAL
: pweight
= PANGO_WEIGHT_NORMAL
; break;
80 case RR_FONTWEIGHT_SEMIBOLD
: pweight
= PANGO_WEIGHT_SEMIBOLD
; break;
81 case RR_FONTWEIGHT_BOLD
: pweight
= PANGO_WEIGHT_BOLD
; break;
82 case RR_FONTWEIGHT_ULTRABOLD
: pweight
= PANGO_WEIGHT_ULTRABOLD
; break;
83 default: g_assert_not_reached();
87 case RR_FONTSLANT_NORMAL
: pstyle
= PANGO_STYLE_NORMAL
; break;
88 case RR_FONTSLANT_ITALIC
: pstyle
= PANGO_STYLE_ITALIC
; break;
89 case RR_FONTSLANT_OBLIQUE
: pstyle
= PANGO_STYLE_OBLIQUE
; break;
90 default: g_assert_not_reached();
94 pango_font_description_set_family(out
->font_desc
, name
);
95 pango_font_description_set_weight(out
->font_desc
, pweight
);
96 pango_font_description_set_style(out
->font_desc
, pstyle
);
97 pango_font_description_set_size(out
->font_desc
, size
* PANGO_SCALE
);
99 /* setup the layout */
100 pango_layout_set_font_description(out
->layout
, out
->font_desc
);
101 pango_layout_set_single_paragraph_mode(out
->layout
, TRUE
);
102 pango_layout_set_ellipsize(out
->layout
, PANGO_ELLIPSIZE_MIDDLE
);
104 /* get the ascent and descent */
105 measure_font(inst
, out
);
110 RrFont
*RrFontOpenDefault(const RrInstance
*inst
)
112 return RrFontOpen(inst
, RrDefaultFontFamily
, RrDefaultFontSize
,
113 RrDefaultFontWeight
, RrDefaultFontSlant
);
116 void RrFontRef(RrFont
*f
)
121 void RrFontClose(RrFont
*f
)
125 g_object_unref(f
->layout
);
126 pango_font_description_free(f
->font_desc
);
132 static void font_measure_full(const RrFont
*f
, const gchar
*str
,
133 gint
*x
, gint
*y
, gint shadow_x
, gint shadow_y
)
137 pango_layout_set_text(f
->layout
, str
, -1);
138 pango_layout_set_width(f
->layout
, -1);
139 pango_layout_get_pixel_extents(f
->layout
, NULL
, &rect
);
140 *x
= rect
.width
+ ABS(shadow_x
);
141 *y
= rect
.height
+ ABS(shadow_y
);
144 RrSize
*RrFontMeasureString(const RrFont
*f
, const gchar
*str
,
145 gint shadow_x
, gint shadow_y
)
148 size
= g_new(RrSize
, 1);
149 font_measure_full(f
, str
, &size
->width
, &size
->height
, shadow_x
, shadow_y
);
153 gint
RrFontHeight(const RrFont
*f
, gint shadow_y
)
155 return (f
->ascent
+ f
->descent
) / PANGO_SCALE
+ ABS(shadow_y
);
158 static inline int font_calculate_baseline(RrFont
*f
, gint height
)
160 /* For my own reference:
162 * ^space/2 ^height ^baseline
165 * | | | | |_ _____ _| |_ _ _
166 * | | | | _/ -_) \ / _| || |
167 * | v_________v \__\___/_\_\\__|\_, |
173 return (((height
* PANGO_SCALE
) /* height of the space in pango units */
174 - (f
->ascent
+ f
->descent
)) /* minus space taken up by text */
175 / 2 /* divided by two -> half of the empty space (this is the top
177 + f
->ascent
) /* now move down to the baseline */
178 / PANGO_SCALE
; /* back to pixels */
181 void RrFontDraw(XftDraw
*d
, RrTextureText
*t
, RrRect
*area
)
187 PangoAttrList
*attrlist
;
189 /* center the text vertically
190 We do this centering based on the 'baseline' since different fonts have
191 different top edges. It looks bad when the whole string is moved when 1
192 character from a non-default language is included in the string */
194 font_calculate_baseline(t
->font
, area
->height
);
196 /* the +2 and -4 leave a small blank edge on the sides */
201 pango_layout_set_text(t
->font
->layout
, t
->string
, -1);
202 pango_layout_set_width(t
->font
->layout
, w
* PANGO_SCALE
);
204 /* * * end of setting up the layout * * */
206 pango_layout_get_pixel_extents(t
->font
->layout
, NULL
, &rect
);
209 /* pango_layout_set_alignment doesn't work with
210 pango_xft_render_layout_line */
211 switch (t
->justify
) {
212 case RR_JUSTIFY_LEFT
:
214 case RR_JUSTIFY_RIGHT
:
217 case RR_JUSTIFY_CENTER
:
222 t
->font
->shortcut_underline
->start_index
= 0;
223 t
->font
->shortcut_underline
->end_index
= 0;
225 if (t
->shadow_offset_x
|| t
->shadow_offset_y
) {
226 c
.color
.red
= t
->shadow_color
->r
| t
->shadow_color
->r
<< 8;
227 c
.color
.green
= t
->shadow_color
->g
| t
->shadow_color
->g
<< 8;
228 c
.color
.blue
= t
->shadow_color
->b
| t
->shadow_color
->b
<< 8;
229 c
.color
.alpha
= 0xffff * t
->shadow_alpha
/ 255;
230 c
.pixel
= t
->shadow_color
->pixel
;
232 /* the attributes are owned by the layout.
233 re-add the attributes to the layout after changing the
234 start and end index */
235 attrlist
= pango_layout_get_attributes(t
->font
->layout
);
236 pango_attr_list_ref(attrlist
);
237 pango_layout_set_attributes(t
->font
->layout
, attrlist
);
238 pango_attr_list_unref(attrlist
);
241 pango_xft_render_layout_line
242 (d
, &c
, pango_layout_get_line(t
->font
->layout
, 0),
243 (x
+ t
->shadow_offset_x
) * PANGO_SCALE
,
244 (y
+ t
->shadow_offset_y
) * PANGO_SCALE
);
247 c
.color
.red
= t
->color
->r
| t
->color
->r
<< 8;
248 c
.color
.green
= t
->color
->g
| t
->color
->g
<< 8;
249 c
.color
.blue
= t
->color
->b
| t
->color
->b
<< 8;
250 c
.color
.alpha
= 0xff | 0xff << 8; /* fully opaque text */
251 c
.pixel
= t
->color
->pixel
;
254 const gchar
*c
= t
->string
+ t
->shortcut_pos
;
256 if (g_utf8_validate(c
, -1, NULL
)) {
257 t
->font
->shortcut_underline
->start_index
= t
->shortcut_pos
;
258 t
->font
->shortcut_underline
->end_index
= t
->shortcut_pos
+
259 (g_utf8_next_char(c
) - c
);
261 /* the attributes are owned by the layout.
262 re-add the attributes to the layout after changing the
263 start and end index */
264 attrlist
= pango_layout_get_attributes(t
->font
->layout
);
265 pango_attr_list_ref(attrlist
);
266 pango_layout_set_attributes(t
->font
->layout
, attrlist
);
267 pango_attr_list_unref(attrlist
);
271 /* layout_line() uses y to specify the baseline
272 The line doesn't need to be freed, it's a part of the layout */
273 pango_xft_render_layout_line
274 (d
, &c
, pango_layout_get_line(t
->font
->layout
, 0),
275 x
* PANGO_SCALE
, y
* PANGO_SCALE
);