forked from linuxmint/cinnamon
-
Notifications
You must be signed in to change notification settings - Fork 0
/
st-shadow.c
190 lines (170 loc) · 5.31 KB
/
st-shadow.c
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
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* st-shadow.c: Boxed type holding for -st-shadow attributes
*
* Copyright 2009, 2010 Florian Müllner
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 2.1 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
* more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "st-shadow.h"
/**
* SECTION: st-shadow
* @short_description: Boxed type for -st-shadow attributes
*
* #StShadow is a boxed type for storing attributes of the -st-shadow
* property, modelled liberally after the CSS3 box-shadow property.
* See http://www.css3.info/preview/box-shadow/
*
*/
/**
* st_shadow_new:
* @color: shadow's color
* @xoffset: horizontal offset
* @yoffset: vertical offset
* @blur: blur radius
* @spread: spread radius
* @inset: whether the shadow should be inset
*
* Creates a new #StShadow
*
* Returns: the newly allocated shadow. Use st_shadow_free() when done
*/
StShadow *
st_shadow_new (ClutterColor *color,
gdouble xoffset,
gdouble yoffset,
gdouble blur,
gdouble spread,
gboolean inset)
{
StShadow *shadow;
shadow = g_slice_new (StShadow);
shadow->color = *color;
shadow->xoffset = xoffset;
shadow->yoffset = yoffset;
shadow->blur = blur;
shadow->spread = spread;
shadow->inset = inset;
shadow->ref_count = 1;
return shadow;
}
/**
* st_shadow_ref:
* @shadow: a #StShadow
*
* Atomically increments the reference count of @shadow by one.
*
* Returns: the passed in #StShadow.
*/
StShadow *
st_shadow_ref (StShadow *shadow)
{
g_return_val_if_fail (shadow != NULL, NULL);
g_return_val_if_fail (shadow->ref_count > 0, shadow);
g_atomic_int_inc (&shadow->ref_count);
return shadow;
}
/**
* st_shadow_unref:
* @shadow: a #StShadow
*
* Atomically decrements the reference count of @shadow by one.
* If the reference count drops to 0, all memory allocated by the
* #StShadow is released.
*/
void
st_shadow_unref (StShadow *shadow)
{
g_return_if_fail (shadow != NULL);
g_return_if_fail (shadow->ref_count > 0);
if (g_atomic_int_dec_and_test (&shadow->ref_count))
g_slice_free (StShadow, shadow);
}
/**
* st_shadow_equal:
* @shadow: a #StShadow
* @other: a different #StShadow
*
* Check if two shadow objects are identical. Note that two shadows may
* compare non-identically if they differ only by floating point rounding
* errors.
*
* Return value: %TRUE if the two shadows are identical
*/
gboolean
st_shadow_equal (StShadow *shadow,
StShadow *other)
{
g_return_val_if_fail (shadow != NULL, FALSE);
g_return_val_if_fail (other != NULL, FALSE);
/* We use strict equality to compare double quantities; this means
* that, for example, a shadow offset of 0.25in does not necessarily
* compare equal to a shadow offset of 18pt in this test. Assume
* that a few false negatives are mostly harmless.
*/
return (clutter_color_equal (&shadow->color, &other->color) &&
shadow->xoffset == other->xoffset &&
shadow->yoffset == other->yoffset &&
shadow->blur == other->blur &&
shadow->spread == other->spread &&
shadow->inset == other->inset);
}
/**
* st_shadow_get_box:
* @shadow: a #StShadow
* @actor_box: the box allocated to a #ClutterAlctor
* @shadow_box: computed box occupied by @shadow
*
* Gets the box used to paint @shadow, which will be partly
* outside of @actor_box
*/
void
st_shadow_get_box (StShadow *shadow,
const ClutterActorBox *actor_box,
ClutterActorBox *shadow_box)
{
g_return_if_fail (shadow != NULL);
g_return_if_fail (actor_box != NULL);
g_return_if_fail (shadow_box != NULL);
/* Inset shadows are drawn below the border, so returning
* the original box is not actually correct; still, it's
* good enough for the purpose of determing additional space
* required outside the actor box.
*/
if (shadow->inset)
{
*shadow_box = *actor_box;
return;
}
shadow_box->x1 = actor_box->x1 + shadow->xoffset
- shadow->blur - shadow->spread;
shadow_box->x2 = actor_box->x2 + shadow->xoffset
+ shadow->blur + shadow->spread;
shadow_box->y1 = actor_box->y1 + shadow->yoffset
- shadow->blur - shadow->spread;
shadow_box->y2 = actor_box->y2 + shadow->yoffset
+ shadow->blur + shadow->spread;
}
GType
st_shadow_get_type (void)
{
static GType _st_shadow_type = 0;
if (G_UNLIKELY (_st_shadow_type == 0))
_st_shadow_type =
g_boxed_type_register_static ("StShadow",
(GBoxedCopyFunc) st_shadow_ref,
(GBoxedFreeFunc) st_shadow_unref);
return _st_shadow_type;
}