1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
|
#include "config.h"
#include "pango-run-private.h"
#include "pango-attr-private.h"
#include "pango-item-private.h"
#include "pango-impl-utils.h"
#include "pango-font-metrics-private.h"
#include "pango-attributes-private.h"
#include <math.h>
/**
* PangoRun:
*
* A `PangoRun` represents a single run within a `PangoLine`.
*
* A run is a range of text with uniform script, font and attributes that
* is shaped as a unit.
*
* Script, font and attributes of a run can be accessed via
* [method@Pango.Run.get_item]. The glyphs that result from shaping
* the text of the run can be obtained via [method@Pango.Run.get_glyphs].
*/
/**
* pango_run_get_item:
* @run: a `PangoRun`
*
* Gets the `PangoItem` for the run.
*
* Returns: (transfer none): the `PangoItem` of @run
*/
PangoItem *
pango_run_get_item (PangoRun *run)
{
return run->glyph_item.item;
}
/**
* pango_run_get_glyphs:
* @run: a `PangoRun`
*
* Gets the `PangoGlyphString` for the run.
*
* Returns: (transfer none): the `PangoGlyphString` of @run
*/
PangoGlyphString *
pango_run_get_glyphs (PangoRun *run)
{
return run->glyph_item.glyphs;
}
static void
pango_shape_get_extents (int n_chars,
PangoAttribute *attr,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect)
{
if (n_chars > 0)
{
ShapeData *data = (ShapeData *)attr->pointer_value;
PangoRectangle *shape_ink = &data->ink_rect;
PangoRectangle *shape_logical = &data->logical_rect;
if (ink_rect)
{
ink_rect->x = MIN (shape_ink->x, shape_ink->x + shape_logical->width * (n_chars - 1));
ink_rect->width = MAX (shape_ink->width, shape_ink->width + shape_logical->width * (n_chars - 1));
ink_rect->y = shape_ink->y;
ink_rect->height = shape_ink->height;
}
if (logical_rect)
{
logical_rect->x = MIN (shape_logical->x, shape_logical->x + shape_logical->width * (n_chars - 1));
logical_rect->width = MAX (shape_logical->width, shape_logical->width + shape_logical->width * (n_chars - 1));
logical_rect->y = shape_logical->y;
logical_rect->height = shape_logical->height;
}
}
else
{
if (ink_rect)
{
ink_rect->x = 0;
ink_rect->y = 0;
ink_rect->width = 0;
ink_rect->height = 0;
}
if (logical_rect)
{
logical_rect->x = 0;
logical_rect->y = 0;
logical_rect->width = 0;
logical_rect->height = 0;
}
}
}
/**
* pango_run_get_extents:
* @run: a `PangoRun`
* @trim: `PangoLeadingTrim` flags
* @ink_rect: (out caller-allocates) (optional): return location
* for the ink extents
* @logical_rect: (out caller-allocates) (optional): return location
* for the logical extents
*
* Gets the extents of a `PangoRun`.
*
* The @trim flags specify if line-height attributes are taken
* into consideration for determining the logical height. See the
* [CSS inline layout](https://www.w3.org/TR/css-inline-3/#inline-height)
* specification for details.
*/
void
pango_run_get_extents (PangoRun *run,
PangoLeadingTrim trim,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect)
{
PangoGlyphItem *glyph_item = &run->glyph_item;
ItemProperties properties;
gboolean has_underline;
gboolean has_overline;
gboolean has_strikethrough;
PangoRectangle logical;
PangoFontMetrics *metrics = NULL;
int y_offset;
pango_item_get_properties (glyph_item->item, &properties);
has_underline = properties.uline_style != PANGO_LINE_STYLE_NONE;
has_overline = properties.oline_style != PANGO_LINE_STYLE_NONE;
has_strikethrough = properties.strikethrough_style != PANGO_LINE_STYLE_NONE;
if (!logical_rect && (glyph_item->item->analysis.flags & PANGO_ANALYSIS_FLAG_CENTERED_BASELINE))
logical_rect = &logical;
if (!logical_rect && (has_underline || has_overline || has_strikethrough))
logical_rect = &logical;
if (properties.shape)
pango_shape_get_extents (glyph_item->item->num_chars, properties.shape,
ink_rect, logical_rect);
else
pango_glyph_string_extents (glyph_item->glyphs, glyph_item->item->analysis.font,
ink_rect, logical_rect);
if (ink_rect && (has_underline || has_overline || has_strikethrough))
{
int underline_thickness;
int underline_position;
int strikethrough_thickness;
int strikethrough_position;
int new_pos;
if (!metrics)
metrics = pango_font_get_metrics (glyph_item->item->analysis.font,
glyph_item->item->analysis.language);
underline_thickness = pango_font_metrics_get_underline_thickness (metrics);
underline_position = pango_font_metrics_get_underline_position (metrics);
strikethrough_thickness = pango_font_metrics_get_strikethrough_thickness (metrics);
strikethrough_position = pango_font_metrics_get_strikethrough_position (metrics);
/* the underline/strikethrough takes x, width of logical_rect.
* Reflect that into ink_rect.
*/
new_pos = MIN (ink_rect->x, logical_rect->x);
ink_rect->width = MAX (ink_rect->x + ink_rect->width, logical_rect->x + logical_rect->width) - new_pos;
ink_rect->x = new_pos;
/* We should better handle the case of height==0 in the following cases.
* If ink_rect->height == 0, we should adjust ink_rect->y appropriately.
*/
if (has_strikethrough)
{
if (ink_rect->height == 0)
{
ink_rect->height = strikethrough_thickness;
ink_rect->y = -strikethrough_position;
}
}
if (properties.oline_style == PANGO_LINE_STYLE_SOLID ||
properties.oline_style == PANGO_LINE_STYLE_DASHED ||
properties.oline_style == PANGO_LINE_STYLE_DOTTED)
{
ink_rect->y -= underline_thickness;
ink_rect->height += underline_thickness;
}
else if (properties.oline_style == PANGO_LINE_STYLE_DOUBLE ||
properties.oline_style == PANGO_LINE_STYLE_WAVY)
{
ink_rect->y -= 3 * underline_thickness;
ink_rect->height += 3 * underline_thickness;
}
if (properties.uline_style == PANGO_LINE_STYLE_SOLID ||
properties.uline_style == PANGO_LINE_STYLE_DASHED ||
properties.uline_style == PANGO_LINE_STYLE_DOTTED)
{
if (properties.uline_position == PANGO_UNDERLINE_POSITION_UNDER)
ink_rect->height += 2 * underline_thickness;
else
ink_rect->height = MAX (ink_rect->height,
underline_thickness - underline_position - ink_rect->y);
}
else if (properties.uline_style == PANGO_LINE_STYLE_DOUBLE ||
properties.uline_style == PANGO_LINE_STYLE_WAVY)
{
if (properties.uline_position == PANGO_UNDERLINE_POSITION_UNDER)
ink_rect->height += 4 * underline_thickness;
else
ink_rect->height = MAX (ink_rect->height,
3 * underline_thickness - underline_position - ink_rect->y);
}
}
y_offset = glyph_item->y_offset;
if (glyph_item->item->analysis.flags & PANGO_ANALYSIS_FLAG_CENTERED_BASELINE)
{
gboolean is_hinted = (logical_rect->y & logical_rect->height & (PANGO_SCALE - 1)) == 0;
int adjustment = logical_rect->y + logical_rect->height / 2;
if (is_hinted)
adjustment = PANGO_UNITS_ROUND (adjustment);
y_offset += adjustment;
}
if (ink_rect)
ink_rect->y -= y_offset;
if (logical_rect)
logical_rect->y -= y_offset;
if (logical_rect && trim != PANGO_LEADING_TRIM_BOTH)
{
int leading;
if (properties.absolute_line_height != 0 || properties.line_height != 0.0)
{
int line_height;
line_height = MAX (properties.absolute_line_height, ceilf (properties.line_height * logical_rect->height));
leading = (line_height - logical_rect->height);
}
else
{
/* line-height 'normal' in the CSS inline layout spec */
if (!metrics)
metrics = pango_font_get_metrics (glyph_item->item->analysis.font,
glyph_item->item->analysis.language);
leading = MAX (metrics->height - (metrics->ascent + metrics->descent) + properties.line_spacing, 0);
}
if ((trim & PANGO_LEADING_TRIM_START) == 0)
logical_rect->y -= leading / 2;
if (trim == PANGO_LEADING_TRIM_NONE)
logical_rect->height += leading;
else
logical_rect->height += (leading - leading / 2);
}
if (metrics)
pango_font_metrics_free (metrics);
}
|
