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_wrap(out
->layout
, PANGO_WRAP_WORD_CHAR
);
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
,
143 gboolean flow
, gint maxwidth
)
147 pango_layout_set_text(f
->layout
, str
, -1);
149 pango_layout_set_single_paragraph_mode(f
->layout
, FALSE
);
150 pango_layout_set_width(f
->layout
, maxwidth
* PANGO_SCALE
);
153 /* single line mode */
154 pango_layout_set_single_paragraph_mode(f
->layout
, TRUE
);
155 pango_layout_set_width(f
->layout
, -1);
158 /* pango_layout_get_pixel_extents lies! this is the right way to get the
159 size of the text's area */
160 pango_layout_get_extents(f
->layout
, NULL
, &rect
);
161 #if PANGO_VERSION_MAJOR > 1 || \
162 (PANGO_VERSION_MAJOR == 1 && PANGO_VERSION_MINOR >= 16)
163 /* pass the logical rect as the ink rect, this is on purpose so we get the
164 full area for the text */
165 pango_extents_to_pixels(&rect
, NULL
);
167 rect
.width
= (rect
.width
+ PANGO_SCALE
- 1) / PANGO_SCALE
;
168 rect
.height
= (rect
.height
+ PANGO_SCALE
- 1) / PANGO_SCALE
;
170 *x
= rect
.width
+ ABS(shadow_x
) + 4 /* we put a 2 px edge on each side */;
171 *y
= rect
.height
+ ABS(shadow_y
);
174 RrSize
*RrFontMeasureString(const RrFont
*f
, const gchar
*str
,
175 gint shadow_x
, gint shadow_y
,
176 gboolean flow
, gint maxwidth
)
180 g_assert(!flow
|| maxwidth
> 0);
182 size
= g_new(RrSize
, 1);
183 font_measure_full(f
, str
, &size
->width
, &size
->height
, shadow_x
, shadow_y
,
188 gint
RrFontHeight(const RrFont
*f
, gint shadow_y
)
190 return (f
->ascent
+ f
->descent
) / PANGO_SCALE
+ ABS(shadow_y
);
193 static inline int font_calculate_baseline(RrFont
*f
, gint height
)
195 /* For my own reference:
197 * ^space/2 ^height ^baseline
200 * | | | | |_ _____ _| |_ _ _
201 * | | | | _/ -_) \ / _| || |
202 * | v_________v \__\___/_\_\\__|\_, |
208 return (((height
* PANGO_SCALE
) /* height of the space in pango units */
209 - (f
->ascent
+ f
->descent
)) /* minus space taken up by text */
210 / 2 /* divided by two -> half of the empty space (this is the top
212 + f
->ascent
) /* now move down to the baseline */
213 / PANGO_SCALE
; /* back to pixels */
216 void RrFontDraw(XftDraw
*d
, RrTextureText
*t
, RrRect
*area
)
222 PangoAttrList
*attrlist
;
223 PangoEllipsizeMode ell
;
225 g_assert(!t
->flow
|| t
->maxwidth
> 0);
229 /* center the text vertically
230 We do this centering based on the 'baseline' since different fonts
231 have different top edges. It looks bad when the whole string is
232 moved when 1 character from a non-default language is included in
234 y
+= font_calculate_baseline(t
->font
, area
->height
);
236 /* the +2 and -4 leave a small blank edge on the sides */
239 if (t
->flow
) w
= MAX(w
, t
->maxwidth
);
243 switch (t
->ellipsize
) {
244 case RR_ELLIPSIZE_NONE
:
245 ell
= PANGO_ELLIPSIZE_NONE
;
247 case RR_ELLIPSIZE_START
:
248 ell
= PANGO_ELLIPSIZE_START
;
250 case RR_ELLIPSIZE_MIDDLE
:
251 ell
= PANGO_ELLIPSIZE_MIDDLE
;
253 case RR_ELLIPSIZE_END
:
254 ell
= PANGO_ELLIPSIZE_END
;
258 pango_layout_set_text(t
->font
->layout
, t
->string
, -1);
259 pango_layout_set_width(t
->font
->layout
, w
* PANGO_SCALE
);
260 pango_layout_set_ellipsize(t
->font
->layout
, ell
);
261 pango_layout_set_single_paragraph_mode(t
->font
->layout
, !t
->flow
);
263 /* * * end of setting up the layout * * */
265 pango_layout_get_pixel_extents(t
->font
->layout
, NULL
, &rect
);
268 /* pango_layout_set_alignment doesn't work with
269 pango_xft_render_layout_line */
270 switch (t
->justify
) {
271 case RR_JUSTIFY_LEFT
:
273 case RR_JUSTIFY_RIGHT
:
276 case RR_JUSTIFY_CENTER
:
281 if (t
->shadow_offset_x
|| t
->shadow_offset_y
) {
282 /* From nvidia's readme (chapter 23):
284 When rendering to a 32-bit window, keep in mind that the X RENDER
285 extension, used by most composite managers, expects "premultiplied
286 alpha" colors. This means that if your color has components (r,g,b)
287 and alpha value a, then you must render (a*r, a*g, a*b, a) into the
290 c
.color
.red
= (t
->shadow_color
->r
| t
->shadow_color
->r
<< 8) *
291 t
->shadow_alpha
/ 255;
292 c
.color
.green
= (t
->shadow_color
->g
| t
->shadow_color
->g
<< 8) *
293 t
->shadow_alpha
/ 255;
294 c
.color
.blue
= (t
->shadow_color
->b
| t
->shadow_color
->b
<< 8) *
295 t
->shadow_alpha
/ 255;
296 c
.color
.alpha
= 0xffff * t
->shadow_alpha
/ 255;
297 c
.pixel
= t
->shadow_color
->pixel
;
301 pango_xft_render_layout_line
303 #if PANGO_VERSION_MAJOR > 1 || \
304 (PANGO_VERSION_MAJOR == 1 && PANGO_VERSION_MINOR >= 16)
305 pango_layout_get_line_readonly(t
->font
->layout
, 0),
307 pango_layout_get_line(t
->font
->layout
, 0),
309 (x
+ t
->shadow_offset_x
) * PANGO_SCALE
,
310 (y
+ t
->shadow_offset_y
) * PANGO_SCALE
);
313 pango_xft_render_layout(d
, &c
, t
->font
->layout
,
314 (x
+ t
->shadow_offset_x
) * PANGO_SCALE
,
315 (y
+ t
->shadow_offset_y
) * PANGO_SCALE
);
319 c
.color
.red
= t
->color
->r
| t
->color
->r
<< 8;
320 c
.color
.green
= t
->color
->g
| t
->color
->g
<< 8;
321 c
.color
.blue
= t
->color
->b
| t
->color
->b
<< 8;
322 c
.color
.alpha
= 0xff | 0xff << 8; /* fully opaque text */
323 c
.pixel
= t
->color
->pixel
;
326 const gchar
*s
= t
->string
+ t
->shortcut_pos
;
328 t
->font
->shortcut_underline
->start_index
= t
->shortcut_pos
;
329 t
->font
->shortcut_underline
->end_index
= t
->shortcut_pos
+
330 (g_utf8_next_char(s
) - s
);
332 /* the attributes are owned by the layout.
333 re-add the attributes to the layout after changing the
334 start and end index */
335 attrlist
= pango_layout_get_attributes(t
->font
->layout
);
336 pango_attr_list_ref(attrlist
);
337 pango_layout_set_attributes(t
->font
->layout
, attrlist
);
338 pango_attr_list_unref(attrlist
);
341 /* layout_line() uses y to specify the baseline
342 The line doesn't need to be freed, it's a part of the layout */
344 pango_xft_render_layout_line
346 #if PANGO_VERSION_MAJOR > 1 || \
347 (PANGO_VERSION_MAJOR == 1 && PANGO_VERSION_MINOR >= 16)
348 pango_layout_get_line_readonly(t
->font
->layout
, 0),
350 pango_layout_get_line(t
->font
->layout
, 0),
356 pango_xft_render_layout(d
, &c
, t
->font
->layout
,
362 t
->font
->shortcut_underline
->start_index
= 0;
363 t
->font
->shortcut_underline
->end_index
= 0;
364 /* the attributes are owned by the layout.
365 re-add the attributes to the layout after changing the
366 start and end index */
367 attrlist
= pango_layout_get_attributes(t
->font
->layout
);
368 pango_attr_list_ref(attrlist
);
369 pango_layout_set_attributes(t
->font
->layout
, attrlist
);
370 pango_attr_list_unref(attrlist
);