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
|
#include <u.h>
#include <libc.h>
#include <draw.h>
Display *display;
Font *font;
Image *screen;
int _drawdebug;
static char deffontname[] = "*default*";
Screen *_screen;
int debuglockdisplay = 1;
/*
static void
drawshutdown(void)
{
Display *d;
d = display;
if(d){
display = nil;
closedisplay(d);
}
}
*/
int
initdraw(void (*error)(Display*, char*), char *fontname, char *label)
{
Subfont *df;
char buf[128];
display = _initdisplay(error, label); /* sets screen too */
if(display == nil)
return -1;
lockdisplay(display);
display->screenimage = display->image;
/*
* Set up default font
*/
df = getdefont(display);
display->defaultsubfont = df;
if(df == nil){
fprint(2, "imageinit: can't open default subfont: %r\n");
Error:
closedisplay(display);
display = nil;
return -1;
}
if(fontname == nil)
fontname = getenv("font"); /* leak */
/*
* Build fonts with caches==depth of screen, for speed.
* If conversion were faster, we'd use 0 and save memory.
*/
if(fontname == nil){
snprint(buf, sizeof buf, "%d %d\n0 %d\t%s\n", df->height, df->ascent,
df->n-1, deffontname);
//BUG: Need something better for this installsubfont("*default*", df);
font = buildfont(display, buf, deffontname);
if(font == nil){
fprint(2, "initdraw: can't open default font: %r\n");
goto Error;
}
}else{
font = openfont(display, fontname); /* BUG: grey fonts */
if(font == nil){
fprint(2, "initdraw: can't open font %s: %r\n", fontname);
goto Error;
}
}
display->defaultfont = font;
display->white = allocimage(display, Rect(0,0,1,1), GREY1, 1, DWhite);
display->black = allocimage(display, Rect(0,0,1,1), GREY1, 1, DBlack);
if(display->white == nil || display->black == nil){
fprint(2, "initdraw: can't allocate white and black");
goto Error;
}
display->opaque = display->white;
display->transparent = display->black;
_screen = allocscreen(display->image, display->white, 0);
screen = _allocwindow(nil, _screen, display->image->r, Refnone, DWhite);
display->screenimage = screen;
draw(screen, screen->r, display->white, nil, ZP);
flushimage(display, 1);
/*
* I don't see any reason to go away gracefully,
* and if some other proc exits holding the display
* lock, this atexit call never finishes.
*
* atexit(drawshutdown);
*/
return 1;
}
/*
* Call with d unlocked.
* Note that disp->defaultfont and defaultsubfont are not freed here.
*/
void
closedisplay(Display *disp)
{
int fd;
char buf[128];
if(disp == nil)
return;
if(disp == display)
display = nil;
if(disp->oldlabel[0]){
snprint(buf, sizeof buf, "%s/label", disp->windir);
fd = open(buf, OWRITE);
if(fd >= 0){
write(fd, disp->oldlabel, strlen(disp->oldlabel));
close(fd);
}
}
free(disp->devdir);
free(disp->windir);
if(disp->white)
freeimage(disp->white);
if(disp->black)
freeimage(disp->black);
free(disp);
}
void
lockdisplay(Display *disp)
{
if(debuglockdisplay){
/* avoid busy looping; it's rare we collide anyway */
while(!canqlock(&disp->qlock)){
fprint(1, "proc %d waiting for display lock...\n", getpid());
sleep(1000);
}
}else
qlock(&disp->qlock);
}
void
unlockdisplay(Display *disp)
{
qunlock(&disp->qlock);
}
void
drawerror(Display *d, char *s)
{
char err[ERRMAX];
if(d->error)
d->error(d, s);
else{
errstr(err, sizeof err);
fprint(2, "draw: %s: %s\n", s, err);
exits(s);
}
}
static
int
doflush(Display *d)
{
int n;
n = d->bufp-d->buf;
if(n <= 0)
return 1;
if(_drawmsgwrite(d, d->buf, n) != n){
if(_drawdebug)
fprint(2, "flushimage fail: d=%p: %r\n", d); /**/
d->bufp = d->buf; /* might as well; chance of continuing */
return -1;
}
d->bufp = d->buf;
return 1;
}
int
flushimage(Display *d, int visible)
{
if(visible){
*d->bufp++ = 'v'; /* five bytes always reserved for this */
if(d->_isnewdisplay){
BPLONG(d->bufp, d->screenimage->id);
d->bufp += 4;
}
}
return doflush(d);
}
uchar*
bufimage(Display *d, int n)
{
uchar *p;
if(n<0 || d == nil || n>d->bufsize){
abort();
werrstr("bad count in bufimage");
return 0;
}
if(d->bufp+n > d->buf+d->bufsize)
if(doflush(d) < 0)
return 0;
p = d->bufp;
d->bufp += n;
return p;
}
|