1 /* Pango
2 * pangocairofc-font.c: Cairo font handling, fontconfig backend
3 *
4 * Copyright (C) 2000-2005 Red Hat Software
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Library General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Library General Public License for more details.
15 *
16 * You should have received a copy of the GNU Library General Public
17 * License along with this library; if not, write to the
18 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 * Boston, MA 02111-1307, USA.
20 */
21
22 #include "config.h"
23
24 /* Freetype has undefined macros in its header */
25 #pragma GCC diagnostic push
26 #pragma GCC diagnostic ignored "-Wundef"
27 #include <cairo-ft.h>
28 #pragma GCC diagnostic pop
29
30 #include "pangofc-fontmap-private.h"
31 #include "pangocairo-private.h"
32 #include "pangocairo-fc-private.h"
33 #include "pangofc-private.h"
34 #include "pango-impl-utils.h"
35
36 #include <hb-ot.h>
37 #include <freetype/ftmm.h>
38
39 #define PANGO_TYPE_CAIRO_FC_FONT (pango_cairo_fc_font_get_type ())
40 #define PANGO_CAIRO_FC_FONT(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), PANGO_TYPE_CAIRO_FC_FONT, PangoCairoFcFont))
41 #define PANGO_CAIRO_FC_FONT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), PANGO_TYPE_CAIRO_FC_FONT, PangoCairoFcFontClass))
42 #define PANGO_CAIRO_IS_FONT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), PANGO_TYPE_CAIRO_FC_FONT))
43 #define PANGO_CAIRO_FC_FONT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), PANGO_TYPE_CAIRO_FC_FONT, PangoCairoFcFontClass))
44
45 typedef struct _PangoCairoFcFont PangoCairoFcFont;
46 typedef struct _PangoCairoFcFontClass PangoCairoFcFontClass;
47
48 struct _PangoCairoFcFont
49 {
50 PangoFcFont font;
51 PangoCairoFontPrivate cf_priv;
52 };
53
54 struct _PangoCairoFcFontClass
55 {
56 PangoFcFontClass parent_class;
57 };
58
59 _PANGO_EXTERN
60 GType pango_cairo_fc_font_get_type (void);
61
62 /********************************
63 * Method implementations *
64 ********************************/
65
66 static cairo_font_face_t *
pango_cairo_fc_font_create_font_face(PangoCairoFont * cfont)67 pango_cairo_fc_font_create_font_face (PangoCairoFont *cfont)
68 {
69 PangoFcFont *fcfont = (PangoFcFont *) (cfont);
70
71 return cairo_ft_font_face_create_for_pattern (fcfont->font_pattern);
72 }
73
74 static PangoFontMetrics *
pango_cairo_fc_font_create_base_metrics_for_context(PangoCairoFont * cfont,PangoContext * context)75 pango_cairo_fc_font_create_base_metrics_for_context (PangoCairoFont *cfont,
76 PangoContext *context)
77 {
78 PangoFcFont *fcfont = (PangoFcFont *) (cfont);
79
80 return pango_fc_font_create_base_metrics_for_context (fcfont, context);
81 }
82
83 static void
cairo_font_iface_init(PangoCairoFontIface * iface)84 cairo_font_iface_init (PangoCairoFontIface *iface)
85 {
86 iface->create_font_face = pango_cairo_fc_font_create_font_face;
87 iface->create_base_metrics_for_context = pango_cairo_fc_font_create_base_metrics_for_context;
88 iface->cf_priv_offset = G_STRUCT_OFFSET (PangoCairoFcFont, cf_priv);
89 }
90
91 G_DEFINE_TYPE_WITH_CODE (PangoCairoFcFont, pango_cairo_fc_font, PANGO_TYPE_FC_FONT,
92 { G_IMPLEMENT_INTERFACE (PANGO_TYPE_CAIRO_FONT, cairo_font_iface_init) })
93
94 static void
pango_cairo_fc_font_finalize(GObject * object)95 pango_cairo_fc_font_finalize (GObject *object)
96 {
97 PangoCairoFcFont *cffont = (PangoCairoFcFont *) object;
98
99 _pango_cairo_font_private_finalize (&cffont->cf_priv);
100
101 G_OBJECT_CLASS (pango_cairo_fc_font_parent_class)->finalize (object);
102 }
103
104 /* we want get_glyph_extents extremely fast, so we use a small wrapper here
105 * to avoid having to lookup the interface data like we do for get_metrics
106 * in _pango_cairo_font_get_metrics(). */
107 static void
pango_cairo_fc_font_get_glyph_extents(PangoFont * font,PangoGlyph glyph,PangoRectangle * ink_rect,PangoRectangle * logical_rect)108 pango_cairo_fc_font_get_glyph_extents (PangoFont *font,
109 PangoGlyph glyph,
110 PangoRectangle *ink_rect,
111 PangoRectangle *logical_rect)
112 {
113 PangoCairoFcFont *cffont = (PangoCairoFcFont *) (font);
114
115 _pango_cairo_font_private_get_glyph_extents (&cffont->cf_priv,
116 glyph,
117 ink_rect,
118 logical_rect);
119 }
120
121 static FT_Face
pango_cairo_fc_font_lock_face(PangoFcFont * font)122 pango_cairo_fc_font_lock_face (PangoFcFont *font)
123 {
124 PangoCairoFcFont *cffont = (PangoCairoFcFont *) (font);
125 cairo_scaled_font_t *scaled_font = _pango_cairo_font_private_get_scaled_font (&cffont->cf_priv);
126
127 if (G_UNLIKELY (!scaled_font))
128 return NULL;
129
130 return cairo_ft_scaled_font_lock_face (scaled_font);
131 }
132
133 static void
pango_cairo_fc_font_unlock_face(PangoFcFont * font)134 pango_cairo_fc_font_unlock_face (PangoFcFont *font)
135 {
136 PangoCairoFcFont *cffont = (PangoCairoFcFont *) (font);
137 cairo_scaled_font_t *scaled_font = _pango_cairo_font_private_get_scaled_font (&cffont->cf_priv);
138
139 if (G_UNLIKELY (!scaled_font))
140 return;
141
142 cairo_ft_scaled_font_unlock_face (scaled_font);
143 }
144
145 static void
pango_cairo_fc_font_class_init(PangoCairoFcFontClass * class)146 pango_cairo_fc_font_class_init (PangoCairoFcFontClass *class)
147 {
148 GObjectClass *object_class = G_OBJECT_CLASS (class);
149 PangoFontClass *font_class = PANGO_FONT_CLASS (class);
150 PangoFcFontClass *fc_font_class = PANGO_FC_FONT_CLASS (class);
151
152 object_class->finalize = pango_cairo_fc_font_finalize;
153
154 font_class->get_glyph_extents = pango_cairo_fc_font_get_glyph_extents;
155 font_class->get_metrics = _pango_cairo_font_get_metrics;
156
157 fc_font_class->lock_face = pango_cairo_fc_font_lock_face;
158 fc_font_class->unlock_face = pango_cairo_fc_font_unlock_face;
159 }
160
161 static void
pango_cairo_fc_font_init(PangoCairoFcFont * cffont G_GNUC_UNUSED)162 pango_cairo_fc_font_init (PangoCairoFcFont *cffont G_GNUC_UNUSED)
163 {
164 }
165
166 /********************
167 * Private API *
168 ********************/
169
170 static double
get_font_size(const FcPattern * pattern)171 get_font_size (const FcPattern *pattern)
172 {
173 double size;
174 double dpi;
175
176 if (FcPatternGetDouble (pattern, FC_PIXEL_SIZE, 0, &size) == FcResultMatch)
177 return size;
178
179 /* Just in case FC_PIXEL_SIZE got unset between pango_fc_make_pattern()
180 * and here. That would be very weird.
181 */
182
183 if (FcPatternGetDouble (pattern, FC_DPI, 0, &dpi) != FcResultMatch)
184 dpi = 72;
185
186 if (FcPatternGetDouble (pattern, FC_SIZE, 0, &size) == FcResultMatch)
187 return size * dpi / 72.;
188
189 /* Whatever */
190 return 18.;
191 }
192
193 static gpointer
get_gravity_class(void)194 get_gravity_class (void)
195 {
196 static GEnumClass *class = NULL; /* MT-safe */
197
198 if (g_once_init_enter (&class))
199 g_once_init_leave(&class, (gpointer)g_type_class_ref (PANGO_TYPE_GRAVITY));
200
201 return class;
202 }
203
204 static PangoGravity
get_gravity(const FcPattern * pattern)205 get_gravity (const FcPattern *pattern)
206 {
207 char *s;
208
209 if (FcPatternGetString (pattern, PANGO_FC_GRAVITY, 0, (FcChar8 **)(void *)&s) == FcResultMatch)
210 {
211 GEnumValue *value = g_enum_get_value_by_nick (get_gravity_class (), s);
212 return value->value;
213 }
214
215 return PANGO_GRAVITY_SOUTH;
216 }
217
218 PangoFcFont *
_pango_cairo_fc_font_new(PangoCairoFcFontMap * cffontmap,PangoFcFontKey * key)219 _pango_cairo_fc_font_new (PangoCairoFcFontMap *cffontmap,
220 PangoFcFontKey *key)
221 {
222 PangoCairoFcFont *cffont;
223 const FcPattern *pattern = pango_fc_font_key_get_pattern (key);
224 cairo_matrix_t font_matrix;
225 FcMatrix fc_matrix, *fc_matrix_val;
226 double size;
227 int i;
228 cairo_font_options_t *options;
229
230 g_return_val_if_fail (PANGO_IS_CAIRO_FC_FONT_MAP (cffontmap), NULL);
231 g_return_val_if_fail (pattern != NULL, NULL);
232
233 cffont = g_object_new (PANGO_TYPE_CAIRO_FC_FONT,
234 "pattern", pattern,
235 "fontmap", cffontmap,
236 NULL);
237
238 size = get_font_size (pattern) /
239 pango_matrix_get_font_scale_factor (pango_fc_font_key_get_matrix (key));
240
241 FcMatrixInit (&fc_matrix);
242 for (i = 0; FcPatternGetMatrix (pattern, FC_MATRIX, i, &fc_matrix_val) == FcResultMatch; i++)
243 FcMatrixMultiply (&fc_matrix, &fc_matrix, fc_matrix_val);
244
245 cairo_matrix_init (&font_matrix,
246 fc_matrix.xx,
247 - fc_matrix.yx,
248 - fc_matrix.xy,
249 fc_matrix.yy,
250 0., 0.);
251
252 cairo_matrix_scale (&font_matrix, size, size);
253
254 options = pango_fc_font_key_get_context_key (key);
255
256 _pango_cairo_font_private_initialize (&cffont->cf_priv,
257 (PangoCairoFont *) cffont,
258 get_gravity (pattern),
259 options,
260 pango_fc_font_key_get_matrix (key),
261 &font_matrix);
262
263 ((PangoFcFont *)(cffont))->is_hinted = _pango_cairo_font_private_is_metrics_hinted (&cffont->cf_priv);
264
265 return (PangoFcFont *) cffont;
266 }
267