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
|
#include "fitz.h"
/*
* Unpack image samples and optionally pad pixels with opaque alpha
*/
#define get1(buf,x) ((buf[x >> 3] >> ( 7 - (x & 7) ) ) & 1 )
#define get2(buf,x) ((buf[x >> 2] >> ( ( 3 - (x & 3) ) << 1 ) ) & 3 )
#define get4(buf,x) ((buf[x >> 1] >> ( ( 1 - (x & 1) ) << 2 ) ) & 15 )
#define get8(buf,x) (buf[x])
#define get16(buf,x) (buf[x << 1])
static unsigned char get1tab1[256][8];
static unsigned char get1tab1p[256][16];
static unsigned char get1tab255[256][8];
static unsigned char get1tab255p[256][16];
static void
initget1tables(void)
{
static int once = 0;
unsigned char bits[1];
int i, k, x;
/* TODO: mutex lock here */
if (once)
return;
for (i = 0; i < 256; i++)
{
bits[0] = i;
for (k = 0; k < 8; k++)
{
x = get1(bits, k);
get1tab1[i][k] = x;
get1tab1p[i][k * 2] = x;
get1tab1p[i][k * 2 + 1] = 255;
get1tab255[i][k] = x * 255;
get1tab255p[i][k * 2] = x * 255;
get1tab255p[i][k * 2 + 1] = 255;
}
}
once = 1;
}
void
fz_unpacktile(fz_pixmap *dst, unsigned char * restrict src, int n, int depth, int stride, int scale)
{
int pad, x, y, k;
int w = dst->w;
pad = 0;
if (dst->n > n)
pad = 255;
initget1tables();
for (y = 0; y < dst->h; y++)
{
unsigned char *sp = src + y * stride;
unsigned char *dp = dst->samples + y * (dst->w * dst->n);
/* Specialized loops */
if (n == 1 && depth == 1 && scale == 1 && !pad)
{
int w3 = w >> 3;
for (x = 0; x < w3; x++)
{
memcpy(dp, get1tab1[*sp++], 8);
dp += 8;
}
x = x << 3;
if (x < w)
memcpy(dp, get1tab1[*sp], w - x);
}
else if (n == 1 && depth == 1 && scale == 255 && !pad)
{
int w3 = w >> 3;
for (x = 0; x < w3; x++)
{
memcpy(dp, get1tab255[*sp++], 8);
dp += 8;
}
x = x << 3;
if (x < w)
memcpy(dp, get1tab255[*sp], w - x);
}
else if (n == 1 && depth == 1 && scale == 1 && pad)
{
int w3 = w >> 3;
for (x = 0; x < w3; x++)
{
memcpy(dp, get1tab1p[*sp++], 16);
dp += 16;
}
x = x << 3;
if (x < w)
memcpy(dp, get1tab1p[*sp], (w - x) << 1);
}
else if (n == 1 && depth == 1 && scale == 255 && pad)
{
int w3 = w >> 3;
for (x = 0; x < w3; x++)
{
memcpy(dp, get1tab255p[*sp++], 16);
dp += 16;
}
x = x << 3;
if (x < w)
memcpy(dp, get1tab255p[*sp], (w - x) << 1);
}
else if (depth == 8 && !pad)
{
int len = w * n;
while (len--)
*dp++ = *sp++;
}
else if (depth == 8 && pad)
{
for (x = 0; x < w; x++)
{
for (k = 0; k < n; k++)
*dp++ = *sp++;
*dp++ = 255;
}
}
else
{
int b = 0;
for (x = 0; x < w; x++)
{
for (k = 0; k < n; k++)
{
switch (depth)
{
case 1: *dp++ = get1(sp, b) * scale; break;
case 2: *dp++ = get2(sp, b) * scale; break;
case 4: *dp++ = get4(sp, b) * scale; break;
case 8: *dp++ = get8(sp, b); break;
case 16: *dp++ = get16(sp, b); break;
}
b++;
}
if (pad)
*dp++ = 255;
}
}
}
}
/*
* Apply decode parameters and scale integers
*/
void
fz_decodetile(fz_pixmap *pix, float *decode)
{
int min[FZ_MAXCOLORS + 2];
int max[FZ_MAXCOLORS + 2];
int sub[FZ_MAXCOLORS + 2];
unsigned char *p = pix->samples;
int len = pix->w * pix->h;
int n = pix->n;
int needed;
int k;
needed = 0;
for (k = 0; k < n; k++)
{
min[k] = decode[k * 2] * 255;
max[k] = decode[k * 2 + 1] * 255;
sub[k] = max[k] - min[k];
needed |= min[k] != 0 || max[k] != 255;
}
if (!needed)
return;
while (len--)
{
for (k = 0; k < n; k++)
p[k] = min[k] + fz_mul255(sub[k], p[k]);
p += n;
}
}
|
