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
|
#include "vnc.h"
#include "vncv.h"
enum {
RGB12 = CHAN4(CIgnore, 4, CRed, 4, CGreen, 4, CBlue, 4),
BGR12 = CHAN4(CIgnore, 4, CBlue, 4, CGreen, 4, CRed, 4),
BGR8 = CHAN3(CBlue, 2, CGreen, 3, CRed, 3),
};
void (*cvtpixels)(uchar*, uchar*, int);
static void
chan2fmt(Pixfmt *fmt, ulong chan)
{
ulong c, rc, shift;
shift = 0;
for(rc = chan; rc; rc >>=8){
c = rc & 0xFF;
switch(TYPE(c)){
case CRed:
fmt->red = (Colorfmt){(1<<NBITS(c))-1, shift};
break;
case CBlue:
fmt->blue = (Colorfmt){(1<<NBITS(c))-1, shift};
break;
case CGreen:
fmt->green = (Colorfmt){(1<<NBITS(c))-1, shift};
break;
}
shift += NBITS(c);
}
}
/*
* convert 32-bit data to 24-bit data by skipping
* the last of every four bytes. we skip the last
* because we keep the server in little endian mode.
*/
static void
cvt32to24(uchar *dst, uchar *src, int npixel)
{
int i;
for(i=0; i<npixel; i++){
*dst++ = *src++;
*dst++ = *src++;
*dst++ = *src++;
src++;
}
}
/*
* convert RGB12 (x4r4g4b4) into CMAP8
*/
static uchar rgb12[16*16*16];
static void
mkrgbtab(void)
{
int r, g, b;
for(r=0; r<16; r++)
for(g=0; g<16; g++)
for(b=0; b<16; b++)
rgb12[r*256+g*16+b] = rgb2cmap(r*0x11, g*0x11, b*0x11);
}
static void
cvtrgb12tocmap8(uchar *dst, uchar *src, int npixel)
{
int i, s;
for(i=0; i<npixel; i++){
s = (src[0] | (src[1]<<8)) & 0xFFF;
*dst++ = rgb12[s];
src += 2;
}
}
/*
* convert BGR8 (b2g3r3, default VNC format) to CMAP8
* some bits are lost.
*/
static uchar bgr8[256];
static void
mkbgrtab(void)
{
int i, r, g, b;
for(i=0; i<256; i++){
b = i>>6;
b = (b<<6)|(b<<4)|(b<<2)|b;
g = (i>>3) & 7;
g = (g<<5)|(g<<2)|(g>>1);
r = i & 7;
r = (r<<5)|(r<<2)|(r>>1);
bgr8[i] = rgb2cmap(r, g, b);
}
}
static void
cvtbgr332tocmap8(uchar *dst, uchar *src, int npixel)
{
uchar *ed;
ed = dst+npixel;
while(dst < ed)
*dst++ = bgr8[*src++];
}
static void
cvt16to32(uchar *dst, uchar *src, int npixel)
{
uchar *ed;
int w, r, g, b;
ed = dst+npixel*4;
while(dst < ed){
w = src[1]<<8 | src[0];
b = (w >> 11) & 0x1F;
g = (w >> 5) & 0x3F;
r = (w >> 0) & 0x1F;
dst[0] = b<<(8-5);
dst[1] = g<<(8-6);
dst[2] = r<<(8-5);
dst += 4;
src += 2;
}
}
void
choosecolor(Vnc *v)
{
int bpp, depth;
ulong chan;
chan = screen->chan;
depth = screen->depth;
bpp = depth;
if((bpp / 8) * 8 != bpp)
sysfatal("screen not supported");
if(bpp == 32 && v->Pixfmt.bpp == 16){
cvtpixels = cvt16to32;
goto Done;
}
if(bpp == 24){
if(verbose)
fprint(2, "24bit emulation using 32bpp\n");
bpp = 32;
cvtpixels = cvt32to24;
}
if(chan == CMAP8){
if(bpp12){
if(verbose)
fprint(2, "8bit emulation using 12bpp\n");
bpp = 16;
depth = 12;
chan = RGB12;
cvtpixels = cvtrgb12tocmap8;
mkrgbtab();
}else{
if(verbose)
fprint(2, "8bit emulation using 6bpp\n"); /* 6: we throw away 1 r, g bit */
bpp = 8;
depth = 8;
chan = BGR8;
cvtpixels = cvtbgr332tocmap8;
mkbgrtab();
}
}
v->bpp = bpp;
v->depth = depth;
v->truecolor = 1;
v->bigendian = 0;
chan2fmt(v, chan);
if(v->red.max == 0 || v->green.max == 0 || v->blue.max == 0)
sysfatal("screen not supported");
Done:
if(verbose)
fprint(2, "%d bpp, %d depth, 0x%lx chan, %d truecolor, %d bigendian\n",
v->bpp, v->depth, screen->chan, v->truecolor, v->bigendian);
/* send information to server */
vncwrchar(v, MPixFmt);
vncwrchar(v, 0); /* padding */
vncwrshort(v, 0);
vncwrpixfmt(v, &v->Pixfmt);
vncflush(v);
}
|
