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
|
/*
* Copyright 2009 John-Mark Bell <jmb@netsurf-browser.org>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef NETSURF_CSS_UTILS_H_
#define NETSURF_CSS_UTILS_H_
#include <libcss/libcss.h>
#include "netsurf/css.h"
/** DPI of the screen, in fixed point units */
extern css_fixed nscss_screen_dpi;
/**
* Length conversion context data.
*/
typedef struct nscss_len_ctx {
/**
* Viewport width in px.
* Only used if unit is vh, vw, vi, vb, vmin, or vmax.
*/
int vw;
/**
* Viewport height in px.
* Only used if unit is vh, vw, vi, vb, vmin, or vmax.
*/
int vh;
/**
* Computed style for the document root element.
* May be NULL if unit is not rem, or rlh.
*/
const css_computed_style *root_style;
} nscss_len_ctx;
/**
* Convert an absolute CSS length to points.
*
* \param[in] ctx Length conversion context.
* \param[in] length Absolute CSS length.
* \param[in] unit Unit of the length.
* \return length in points
*/
css_fixed nscss_len2pt(
const nscss_len_ctx *ctx,
css_fixed length,
css_unit unit);
/**
* Convert a CSS length to pixels.
*
* \param[in] ctx Length conversion context.
* \param[in] length Length to convert.
* \param[in] unit Corresponding unit.
* \param[in] style Computed style applying to length.
* May be NULL if unit is not em, ex, cap, ch, or ic.
* \return length in pixels
*/
css_fixed nscss_len2px(
const nscss_len_ctx *ctx,
css_fixed length,
css_unit unit,
const css_computed_style *style);
/**
* Temporary helper wrappers for for libcss computed style getter, while
* we don't support flexbox related property values.
*/
static inline uint8_t ns_computed_display(
const css_computed_style *style, bool root)
{
uint8_t value = css_computed_display(style, root);
if (value == CSS_DISPLAY_FLEX) {
return CSS_DISPLAY_BLOCK;
} else if (value == CSS_DISPLAY_INLINE_FLEX) {
return CSS_DISPLAY_INLINE_BLOCK;
}
return value;
}
static inline uint8_t ns_computed_display_static(
const css_computed_style *style)
{
uint8_t value = css_computed_display_static(style);
if (value == CSS_DISPLAY_FLEX) {
return CSS_DISPLAY_BLOCK;
} else if (value == CSS_DISPLAY_INLINE_FLEX) {
return CSS_DISPLAY_INLINE_BLOCK;
}
return value;
}
static inline uint8_t ns_computed_min_height(
const css_computed_style *style,
css_fixed *length, css_unit *unit)
{
uint8_t value = css_computed_min_height(style, length, unit);
if (value == CSS_MIN_HEIGHT_AUTO) {
value = CSS_MIN_HEIGHT_SET;
*length = 0;
*unit = CSS_UNIT_PX;
}
return value;
}
static inline uint8_t ns_computed_min_width(
const css_computed_style *style,
css_fixed *length, css_unit *unit)
{
uint8_t value = css_computed_min_width(style, length, unit);
if (value == CSS_MIN_WIDTH_AUTO) {
value = CSS_MIN_WIDTH_SET;
*length = 0;
*unit = CSS_UNIT_PX;
}
return value;
}
#endif
|
