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
|
#include <cairo/cairo.h>
#include <math.h>
#include <wchar.h>
#include "entry.h"
#include "log.h"
#include "nelem.h"
static void rounded_rectangle(cairo_t *cr, uint32_t width, uint32_t height, uint32_t r)
{
cairo_new_path(cr);
/* Top-left */
cairo_arc(cr, r, r, r, -M_PI, -M_PI_2);
/* Top-right */
cairo_arc(cr, width - r, r, r, -M_PI_2, 0);
/* Bottom-right */
cairo_arc(cr, width - r, height - r, r, 0, M_PI_2);
/* Bottom-left */
cairo_arc(cr, r, height - r, r, M_PI_2, M_PI);
cairo_close_path(cr);
}
void entry_init(struct entry *entry, uint8_t *restrict buffer, uint32_t width, uint32_t height, uint32_t scale)
{
entry->image.width = width;
entry->image.height = height;
entry->image.scale = scale;
/*
* Create the cairo surfaces and contexts we'll be using.
*
* In order to avoid an unnecessary copy when passing the image to the
* Wayland server, we accept a pointer to the mmap-ed file that our
* Wayland buffers are created from. This is assumed to be
* (width * height * (sizeof(uint32_t) == 4) * 2) bytes,
* to allow for double buffering.
*/
cairo_surface_t *surface = cairo_image_surface_create_for_data(
buffer,
CAIRO_FORMAT_ARGB32,
width,
height,
width * sizeof(uint32_t)
);
cairo_surface_set_device_scale(surface, scale, scale);
cairo_t *cr = cairo_create(surface);
entry->cairo[0].surface = surface;
entry->cairo[0].cr = cr;
entry->cairo[1].surface = cairo_image_surface_create_for_data(
&buffer[width * height * sizeof(uint32_t)],
CAIRO_FORMAT_ARGB32,
width,
height,
width * sizeof(uint32_t)
);
cairo_surface_set_device_scale(entry->cairo[1].surface, scale, scale);
entry->cairo[1].cr = cairo_create(entry->cairo[1].surface);
/*
* Cairo drawing operations take the scale into account,
* so we account for that here.
*/
width /= scale;
height /= scale;
/* Draw the background */
struct color color = entry->background_color;
cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
cairo_save(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_paint(cr);
cairo_restore(cr);
/* Draw the border with outlines */
cairo_set_line_width(cr, 4 * entry->border.outline_width + 2 * entry->border.width);
rounded_rectangle(cr, width, height, entry->corner_radius);
color = entry->border.outline_color;
cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
cairo_stroke_preserve(cr);
color = entry->border.color;
cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
cairo_set_line_width(cr, 2 * entry->border.outline_width + 2 * entry->border.width);
cairo_stroke_preserve(cr);
color = entry->border.outline_color;
cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
cairo_set_line_width(cr, 2 * entry->border.outline_width);
cairo_stroke_preserve(cr);
/* Clear the overdrawn bits outside of the rounded corners */
cairo_rectangle(cr, 0, 0, width, height);
cairo_set_source_rgba(cr, 0, 0, 0, 0.5);
cairo_save(cr);
cairo_set_fill_rule(cr, CAIRO_FILL_RULE_EVEN_ODD);
cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
cairo_fill(cr);
cairo_restore(cr);
/* Move and clip following draws to be within this outline */
cairo_translate(
cr,
2 * entry->border.outline_width + entry->border.width,
2 * entry->border.outline_width + entry->border.width);
width -= 4 * entry->border.outline_width + 2 * entry->border.width;
height -= 4 * entry->border.outline_width + 2 * entry->border.width;
cairo_rectangle(cr, 0, 0, width, height);
cairo_clip(cr);
/* Move and clip following draws to be within the specified padding */
cairo_translate(cr, entry->padding, entry->padding);
width -= 2 * entry->padding;
height -= 2 * entry->padding;
cairo_rectangle(cr, 0, 0, width, height);
cairo_clip(cr);
/* Setup the backend. */
entry_backend_init(entry, &width, &height, scale);
/*
* To avoid performing all this drawing twice, we take a small
* shortcut. After performing all the drawing as normal on our first
* Cairo context, we can copy over just the important state (the
* transformation matrix and clip rectangle) and perform a memcpy()
* to initialise the other context.
*
* This memcpy can pretty expensive however, and isn't needed until
* we need to draw our second buffer (i.e. when the user presses a
* key). In order to minimise startup time, the memcpy() isn't
* performed here, but instead happens later, just after the first
* frame has been displayed on screen (and while the user is unlikely
* to press another key for the <10ms it takes to memcpy).
*/
cairo_matrix_t mat;
cairo_get_matrix(cr, &mat);
cairo_set_matrix(entry->cairo[1].cr, &mat);
cairo_rectangle(entry->cairo[1].cr, 0, 0, width, height);
cairo_clip(entry->cairo[1].cr);
}
void entry_destroy(struct entry *entry)
{
entry_backend_destroy(entry);
cairo_destroy(entry->cairo[0].cr);
cairo_destroy(entry->cairo[1].cr);
cairo_surface_destroy(entry->cairo[0].surface);
cairo_surface_destroy(entry->cairo[1].surface);
}
void entry_update(struct entry *entry)
{
log_debug("Start rendering entry.\n");
cairo_t *cr = entry->cairo[entry->index].cr;
cairo_save(cr);
/* Clear the image. */
struct color color = entry->background_color;
cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
cairo_save(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_paint(cr);
cairo_restore(cr);
/* Draw our text. */
color = entry->foreground_color;
cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
entry_backend_update(entry);
cairo_restore(cr);
log_debug("Finish rendering entry.\n");
entry->index = !entry->index;
}
void entry_set_scale(struct entry *entry, uint32_t scale)
{
entry->image.scale = scale;
cairo_surface_set_device_scale(entry->cairo[0].surface, scale, scale);
cairo_surface_set_device_scale(entry->cairo[1].surface, scale, scale);
}
|
