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Dogcows Code - chaz/openbox/blob - render/font.c
14b9ea14ae8636d3fcde20b286b13e4d5492d5ac
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 Ben 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.
28 #include <X11/Xft/Xft.h>
37 #define ELIPSES_LENGTH(font) \
38 (font->elipses_length + (font->shadow ? font->offset : 0))
40 #define OB_SHADOW "shadow"
41 #define OB_SHADOW_OFFSET "shadowoffset"
42 #define OB_SHADOW_ALPHA "shadowtint"
44 FcObjectType objs
[] = {
45 { OB_SHADOW
, FcTypeBool
},
46 { OB_SHADOW_OFFSET
, FcTypeInteger
},
47 { OB_SHADOW_ALPHA
, FcTypeInteger
}
51 static PangoContext
*context
;
53 static gboolean started
= FALSE
;
55 static void font_startup(void)
58 g_warning(_("Couldn't initialize Xft."));
64 /* these will never be freed, but we will need
65 * them until we shut down anyway */
66 context
= pango_xft_get_context(RrDisplay(NULL
), RrScreen(NULL
));
67 #endif /* USE_PANGO */
68 /* Here we are teaching xft about the shadow, shadowoffset & shadowtint */
69 FcNameRegisterObjectTypes(objs
, (sizeof(objs
) / sizeof(objs
[0])));
72 static void measure_font(RrFont
*f
)
74 /* xOff, yOff is the normal spacing to the next glyph. */
77 /* measure an elipses */
78 XftTextExtentsUtf8(RrDisplay(f
->inst
), f
->xftfont
,
79 (FcChar8
*)ELIPSES
, strlen(ELIPSES
), &info
);
80 f
->elipses_length
= (signed) info
.xOff
;
83 static RrFont
*openfont(const RrInstance
*inst
, gchar
*fontstring
)
85 /* This function is called for each font in the theme file. */
86 /* It returns a pointer to a RrFont struct after filling it. */
88 FcPattern
*pat
, *match
;
93 guchar
*tmp_string
= NULL
;
95 #endif /* USE_PANGO */
97 if (!(pat
= XftNameParse(fontstring
)))
100 match
= XftFontMatch(RrDisplay(inst
), RrScreen(inst
), pat
, &res
);
101 FcPatternDestroy(pat
);
105 out
= g_new(RrFont
, 1);
108 out
->pango_font_description
= pango_font_description_new();
110 if (FcPatternGetString(match
, "family", 0, &tmp_string
) !=
111 FcResultTypeMismatch
) {
112 pango_font_description_set_family(out
->pango_font_description
,
113 (gchar
*)tmp_string
);
116 if (FcPatternGetString(match
, "style", 0, &tmp_string
) !=
117 FcResultTypeMismatch
) {
119 if (!g_ascii_strcasecmp("bold", (gchar
*)tmp_string
)) {
120 pango_font_description_set_weight(out
->pango_font_description
,
124 else if (!g_ascii_strcasecmp("italic", (gchar
*)tmp_string
)) {
125 pango_font_description_set_style(out
->pango_font_description
,
131 if (FcPatternGetInteger(match
, "pixelsize", 0, &tmp_int
) !=
132 FcResultTypeMismatch
) {
133 pango_font_description_set_absolute_size(out
->pango_font_description
,
134 tmp_int
*PANGO_SCALE
);
137 /* based on gtkmain.c gtk_get_default_language() */
140 PangoFontMetrics
*metrics
;
142 locale
= g_strdup(setlocale(LC_CTYPE
, NULL
));
143 if ((p
= strchr(locale
, '.')))
145 if ((p
= strchr(locale
, '@')))
148 pango_context_get_metrics(context
, out
->pango_font_description
,
149 pango_language_from_string(locale
));
150 out
->pango_ascent
= pango_font_metrics_get_ascent(metrics
);
151 out
->pango_descent
= pango_font_metrics_get_descent(metrics
);
153 pango_font_metrics_unref(metrics
);
155 #endif /* USE_PANGO */
157 if (FcPatternGetBool(match
, OB_SHADOW
, 0, &out
->shadow
) != FcResultMatch
)
160 if (FcPatternGetInteger(match
, OB_SHADOW_OFFSET
, 0, &out
->offset
) !=
164 if (FcPatternGetInteger(match
, OB_SHADOW_ALPHA
, 0, &tint
) != FcResultMatch
)
166 if (tint
> 100) tint
= 100;
167 else if (tint
< -100) tint
= -100;
170 font
= XftFontOpenPattern(RrDisplay(inst
), match
);
172 FcPatternDestroy(match
);
179 /* FcPatternDestroy(match); */
180 #endif /* USE_PANGO */
186 RrFont
*RrFontOpen(const RrInstance
*inst
, gchar
*fontstring
)
195 if ((out
= openfont(inst
, fontstring
)))
197 g_warning(_("Unable to load font: %s\n"), fontstring
);
198 g_warning(_("Trying fallback font: %s\n"), "sans");
200 if ((out
= openfont(inst
, "sans")))
202 g_warning(_("Unable to load font: %s\n"), "sans");
207 void RrFontClose(RrFont
*f
)
211 pango_font_description_free(f
->pango_font_description
);
213 XftFontClose(RrDisplay(f
->inst
), f
->xftfont
);
218 static void font_measure_full(const RrFont
*f
, const gchar
*str
,
224 pl
= pango_layout_new (context
);
225 pango_layout_set_text(pl
, str
, -1);
226 pango_layout_set_font_description(pl
, f
->pango_font_description
);
227 pango_layout_set_single_paragraph_mode(pl
, TRUE
);
228 pango_layout_get_pixel_extents(pl
, NULL
, &rect
);
229 *x
= rect
.width
+ (f
->shadow
? ABS(f
->offset
) : 0);
230 *y
= rect
.height
+ (f
->shadow
? ABS(f
->offset
) : 0);
236 XftTextExtentsUtf8(RrDisplay(f
->inst
), f
->xftfont
,
237 (const FcChar8
*)str
, strlen(str
), &info
);
239 *x
= (signed) info
.xOff
+ (f
->shadow
? ABS(f
->offset
) : 0);
240 *y
= info
.height
+ (f
->shadow
? ABS(f
->offset
) : 0);
241 #endif /* USE_PANGO */
244 RrSize
*RrFontMeasureString(const RrFont
*f
, const gchar
*str
)
247 size
= g_new(RrSize
, 1);
248 font_measure_full (f
, str
, &size
->width
, &size
->height
);
252 gint
RrFontHeight(const RrFont
*f
)
255 return (f
->pango_ascent
258 (f
->shadow
? f
->offset
: 0);
260 return f
->xftfont
->ascent
+ f
->xftfont
->descent
+
261 (f
->shadow
? f
->offset
: 0);
265 gint
RrFontMaxCharWidth(const RrFont
*f
)
267 return (signed) f
->xftfont
->max_advance_width
;
271 static inline int font_calculate_baseline(RrFont
*f
, gint height
)
273 /* For my own reference:
275 * ^space/2 ^height ^baseline
278 * | | | | |_ _____ _| |_ _ _
279 * | | | | _/ -_) \ / _| || |
280 * | v_________v \__\___/_\_\\__|\_, |
286 int asc
= f
->pango_ascent
;
287 int ascdesc
= asc
+ f
->pango_descent
;
288 int space
= height
* PANGO_SCALE
- ascdesc
;
289 int baseline
= space
/ 2 + asc
;
290 return baseline
/ PANGO_SCALE
;
294 void RrFontDraw(XftDraw
*d
, RrTextureText
*t
, RrRect
*area
)
303 gboolean shortened
= FALSE
;
308 pl
= pango_layout_new (context
);
309 #endif /* USE_PANGO */
312 * for xft we pass the top edge of the text for positioning... */
315 (area
->height
- RrFontHeight(t
->font
)) / 2;
317 /* but for pango we pass the baseline, since different fonts have
318 * different top edges. It looks stupid when the baseline of "normal"
319 * text jumps up and down when a "strange" character is just added
320 * to the end of the text */
322 font_calculate_baseline(t
->font
, area
->height
);
324 /* the +2 and -4 leave a small blank edge on the sides */
329 text
= g_string_new(t
->string
);
331 l
= g_utf8_strlen(text
->str
, -1);
332 font_measure_full(t
->font
, text
->str
, &mw
, &mh
);
333 while (l
&& mw
> area
->width
) {
335 /* remove a character from the middle */
336 text
= g_string_erase(text
, l
-- / 2, 1);
337 /* if the elipses are too large, don't show them at all */
338 if (ELIPSES_LENGTH(t
->font
) > area
->width
)
340 font_measure_full(t
->font
, text
->str
, &mw
, &mh
);
341 mw
+= ELIPSES_LENGTH(t
->font
);
344 text
= g_string_insert(text
, (l
+ 1) / 2, ELIPSES
);
349 l
= strlen(text
->str
); /* number of bytes */
352 pango_layout_set_text(pl
, text
->str
, -1);
353 pango_layout_set_font_description(pl
, t
->font
->pango_font_description
);
354 pango_layout_set_single_paragraph_mode(pl
, TRUE
);
355 pango_layout_set_width(pl
, w
* PANGO_SCALE
);
356 pango_layout_set_ellipsize(pl
, PANGO_ELLIPSIZE_MIDDLE
);
357 /* This doesn't work with layout_line() of course */
358 /* pango_layout_set_alignment(pl, (PangoAlignment)(t->justify)); */
359 pango_layout_get_pixel_extents(pl
, NULL
, &rect
);
362 #endif /* USE_PANGO */
364 switch (t
->justify
) {
365 case RR_JUSTIFY_LEFT
:
367 case RR_JUSTIFY_RIGHT
:
370 case RR_JUSTIFY_CENTER
:
375 if (t
->font
->shadow
) {
376 if (t
->font
->tint
>= 0) {
380 c
.color
.alpha
= 0xffff * t
->font
->tint
/ 100;
381 c
.pixel
= BlackPixel(RrDisplay(t
->font
->inst
),
382 RrScreen(t
->font
->inst
));
384 c
.color
.red
= 0xffff;
385 c
.color
.green
= 0xffff;
386 c
.color
.blue
= 0xffff;
387 c
.color
.alpha
= 0xffff * -t
->font
->tint
/ 100;
388 c
.pixel
= WhitePixel(RrDisplay(t
->font
->inst
),
389 RrScreen(t
->font
->inst
));
392 XftDrawStringUtf8(d
, &c
, t
->font
->xftfont
, x
+ t
->font
->offset
,
393 t
->font
->xftfont
->ascent
+ y
+ t
->font
->offset
,
394 (FcChar8
*)text
->str
, l
);
395 #else /* USE_PANGO */
397 pango_xft_render_layout_line(d
, &c
, pango_layout_get_line(pl
, 0),
398 (x
+ t
->font
->offset
) * PANGO_SCALE
,
399 (y
+ t
->font
->offset
) * PANGO_SCALE
);
400 #endif /* USE_PANGO */
402 c
.color
.red
= t
->color
->r
| t
->color
->r
<< 8;
403 c
.color
.green
= t
->color
->g
| t
->color
->g
<< 8;
404 c
.color
.blue
= t
->color
->b
| t
->color
->b
<< 8;
405 c
.color
.alpha
= 0xff | 0xff << 8; /* fully opaque text */
406 c
.pixel
= t
->color
->pixel
;
409 XftDrawStringUtf8(d
, &c
, t
->font
->xftfont
, x
,
410 t
->font
->xftfont
->ascent
+ y
,
411 (FcChar8
*)text
->str
, l
);
412 #else /* USE_PANGO */
413 /* layout_line() bases y on the baseline, while layout() bases y on the
414 * top of the ink layout. We want the baseline to always be in the same
415 * place, thusly, we use layout_line()
416 * The actual line doesn't need to be freed (per the pango docs) */
417 pango_xft_render_layout_line(d
, &c
, pango_layout_get_line(pl
, 0),
418 x
* PANGO_SCALE
, y
* PANGO_SCALE
);
422 g_string_free(text
, TRUE
);
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