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
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
|
#include <errno.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <unistd.h>
static int safe_write(int fd, void *buf, size_t size)
{
size_t written = 0;
ssize_t ret = 0;
while (size) {
ret = write(fd, buf, size);
if (ret == -1 && errno == EINTR) {
continue;
} else if (ret > 0) {
written += ret;
buf += ret;
size -= ret;
} else if (written) {
ret = written;
break;
} else {
break;
}
}
return ret;
}
static int safe_read(int fd, void *buf, size_t size)
{
size_t rd = 0;
ssize_t ret = 0;
while (size) {
ret = read(fd, buf, size);
if (ret == -1 && errno == EINTR) {
continue;
} else if (ret > 0) {
rd += ret;
buf += ret;
size -= ret;
} else if (rd) {
ret = rd;
break;
} else {
break;
}
}
return ret;
}
static void detile_gen(void *dst, void *src, unsigned int unit_size,
unsigned int tile_width, unsigned int tile_height,
unsigned int blocks_x, unsigned int blocks_y)
{
unsigned int major_x, minor_x, major_y, minor_y;
unsigned int tile_size = tile_width * tile_height;
unsigned int tile_stride = tile_size * blocks_x;
unsigned int src_p, dst_p;
for (major_y = 0; major_y < blocks_y; major_y++) {
for (minor_y = 0; minor_y < tile_height; minor_y++) {
unsigned int dst_y = major_y * tile_height + minor_y;
for (major_x = 0; major_x < blocks_x; major_x++) {
for (minor_x = 0; minor_x < tile_width; minor_x++) {
unsigned int dst_x = major_x * tile_width + minor_x;
unsigned int src_maj = major_y * tile_stride + major_x * tile_size;
unsigned int src_min = minor_y * tile_width + minor_x;
dst_p = (dst_y * tile_width * blocks_x + dst_x) * unit_size;
src_p = (src_maj + src_min) * unit_size;
memcpy(dst + dst_p, src + src_p, unit_size);
}
}
}
}
}
static void demultitile(void *dst, void *src, unsigned ps, unsigned w, unsigned h)
{
void *tmp = malloc(ps * w * h);
void *src_u, *src_l;
unsigned int tile_bytes;
unsigned int tile_stride;
unsigned int tile_w = w / 4;
unsigned int tile_h = h / 4;
int x, y;
/*
* 4 8 12 16 20 24 28 32 36 40 44 48 52 56 60 64
* u1 u2 l1 l2 u5 u6 l5 l6 u9 u10 l9 l10 u13 u14 l13 l14
* l3 l4 u3 u4 l7 l8 u7 u8 l11 l12 u11 u12 l15 l16 u15 u16
*/
tile_bytes = ps * 4 * 4; /* each 4x4 tile */
tile_stride = tile_bytes * tile_w; /* one full row of tiles */
src_u = src;
src_l = src + tile_stride * tile_h / 2;
if (0) {
fprintf(stderr, "tile bytes = 0x%x\n", tile_bytes);
fprintf(stderr, "tile stride = 0x%x\n", tile_stride);
fprintf(stderr, "u -> l = 0x%x\n", src_l - src_u);
}
for (y = 0; y < tile_h / 2; y++) {
void *dpyu = tmp + y * 2 * tile_stride;
void *dpyl = dpyu + tile_stride;
void *spyu = src_u + y * tile_stride; /* upper half */
void *spyl = src_l + y * tile_stride; /* lower half */
for (x = 0; x < tile_w / 4; x++) {
void *dpu = dpyu + x * 4 * tile_bytes;
void *dpl = dpyl + x * 4 * tile_bytes;
void *spu = spyu + x * 4 * tile_bytes;
void *spl = spyl + x * 4 * tile_bytes;
memcpy(dpu, spu, 2 * tile_bytes);
memcpy(dpu + 2 * tile_bytes, spl, 2 * tile_bytes);
memcpy(dpl, spl + 2 * tile_bytes, 2 * tile_bytes);
memcpy(dpl + 2 * tile_bytes, spu + 2 * tile_bytes, 2 * tile_bytes);
}
}
detile_gen(dst, tmp, ps, 4, 4, tile_w, tile_h);
free(tmp);
}
static void detile(void *dst, void *src, unsigned ps, unsigned w, unsigned h)
{
detile_gen(dst, src, ps, 4, 4, w / 4, h / 4);
}
int main(int argc, char *argv[])
{
struct stat st;
void *ptr, *out;
int fd = 0;
int opt, ret, cpp = 4, width = 0, height = -1, multitile = 0;
size_t size;
while ((opt = getopt(argc, argv, "w:h:m")) != -1) {
switch (opt) {
case 'w':
width = strtoul(optarg, NULL, 10);
break;
case 'h':
height = strtoul(optarg, NULL, 10);
break;
case 'm':
multitile = 1;
break;
default:
fprintf(stderr, "Usage: %s [-w WIDTH] [-h HEIGHT] [FILE]\n",
argv[0]);
return 1;
}
}
if (optind < argc) {
fd = open(argv[optind], O_RDONLY);
if (fd == -1) {
fprintf(stderr, "%s: %s: %m\n", argv[0], argv[optind]);
return 1;
}
} else {
fd = dup(0);
}
if (fstat(fd, &st) == -1) {
fprintf(stderr, "%s: failed to stat: %m\n", argv[0]);
close(fd);
return 1;
}
if (height == -1)
height = st.st_size / (width * cpp);
size = cpp * width * height;
if (st.st_size) {
if (size > st.st_size) {
fprintf(stderr, "%s: width/height exceeds file size\n",
argv[0]);
close(fd);
return 1;
}
ptr = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
if (ptr == (void *)-1) {
fprintf(stderr, "%s: failed to mmap: %m", argv[0]);
close(fd);
return 1;
}
} else {
ptr = malloc(size);
if (!ptr) {
fprintf(stderr, "%s: out of memory\n", argv[0]);
close(fd);
return 1;
}
ret = safe_read(fd, ptr, size);
if (ret < 0) {
fprintf(stderr, "%s: %m\n", argv[0]);
free(ptr);
close(fd);
return 1;
} else if (ret != size) {
fprintf(stderr, "%s: short read\n", argv[0]);
free(ptr);
close(fd);
return 1;
}
}
out = malloc(size);
if (multitile)
demultitile(out, ptr, cpp, width, height);
else
detile(out, ptr, cpp, width, height);
ret = safe_write(1, out, size);
free(out);
if (ret < 0) {
fprintf(stderr, "%s: write: %m\n", argv[0]);
return 1;
} else if (ret != size) {
fprintf(stderr, "%s: short write\n", argv[0]);
return 1;
}
return 0;
}
|
