author | Tero Marttila <terom@fixme.fi> |
Mon, 28 Dec 2009 19:54:41 +0200 | |
changeset 2 | 05de54150a4c |
parent 1 | f3cde3db1fef |
child 3 | da7c6dcafb43 |
permissions | -rw-r--r-- |
0 | 1 |
#include "cache.h" |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <fcntl.h> |
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#include <sys/mman.h> |
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#include <errno.h> |
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static int pt_cache_new (struct pt_cache **cache_ptr, const char *path) |
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{ |
15 |
struct pt_cache *cache; |
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// alloc |
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if ((cache = calloc(1, sizeof(*cache))) == NULL) |
19 |
return -1; |
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if ((cache->path = strdup(path)) == NULL) |
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goto error; |
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// init |
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cache->fd = -1; |
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// ok |
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*cache_ptr = cache; |
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return 0; |
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error: |
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// cleanup |
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if (cache) |
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pt_cache_destroy(cache); |
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return -1; |
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38 |
} |
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int pt_cache_open (struct pt_cache **cache_ptr, const char *path, int mode) |
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{ |
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struct pt_cache *cache; |
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// alloc |
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if (pt_cache_new(&cache, path)) |
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return -1; |
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// ok |
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*cache_ptr = cache; |
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51 |
return 0; |
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} |
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int pt_cache_stale (struct pt_cache *cache, const char *img_path) |
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{ |
2 | 56 |
struct stat st_img, st_cache; |
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// test original file |
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if (stat(img_path, &st_img) < 0) |
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return -1; |
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// test cache file |
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if (stat(cache->path, &st_cache) < 0) { |
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// always stale if it doesn't exist yet |
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if (errno == ENOENT) |
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return 1; |
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else |
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return -1; |
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} |
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// compare mtime |
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return (st_img.st_mtime > st_cache.st_mtime); |
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} |
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/** |
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* Abort any incomplete open operation, cleaning up |
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*/ |
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static void pt_cache_abort (struct pt_cache *cache) |
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{ |
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if (cache->mmap != NULL) { |
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munmap(cache->mmap, cache->size); |
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82 |
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cache->mmap = NULL; |
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84 |
} |
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85 |
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if (cache->fd >= 0) { |
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close(cache->fd); |
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88 |
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cache->fd = -1; |
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90 |
} |
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91 |
} |
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92 |
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/** |
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* Open the cache file as an fd. |
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* |
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* XXX: needs locking |
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97 |
*/ |
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static int pt_cache_open_fd (struct pt_cache *cache, int *fd_ptr) |
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99 |
{ |
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100 |
int fd; |
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101 |
int flags = 0; |
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102 |
|
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103 |
// determine open flags |
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104 |
// XXX: O_RDONLY | O_WRONLY == O_RDWR? |
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105 |
if (cache->mode & PT_IMG_READ) |
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106 |
flags |= O_RDONLY; |
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107 |
|
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108 |
if (cache->mode & PT_IMG_WRITE) |
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109 |
flags |= (O_WRONLY | O_CREAT); |
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110 |
|
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111 |
// actual open() |
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112 |
if ((fd = open(cache->path, flags)) < 0) |
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113 |
return -1; |
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114 |
|
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115 |
// ok |
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116 |
*fd_ptr = fd; |
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117 |
|
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118 |
return 0; |
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119 |
} |
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120 |
|
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121 |
/** |
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122 |
* Mmap the opened cache file from offset PT_CACHE_PAGE, using the calculated size stored in cache->size |
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123 |
*/ |
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124 |
static int pt_cache_open_mmap (struct pt_cache *cache, void **addr_ptr) |
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125 |
{ |
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126 |
int prot = 0; |
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127 |
void *addr; |
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128 |
|
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129 |
// determine prot |
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130 |
if (cache->mode & PT_IMG_READ) |
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131 |
prot |= PROT_READ; |
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132 |
|
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133 |
if (cache->mode & PT_IMG_WRITE) |
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134 |
prot |= PROT_WRITE; |
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135 |
|
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136 |
// perform mmap() from second page on |
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137 |
if ((addr = mmap(NULL, cache->size, prot, MAP_SHARED, cache->fd, PT_CACHE_PAGE)) == MAP_FAILED) |
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138 |
return -1; |
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139 |
|
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140 |
// ok |
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141 |
*addr_ptr = addr; |
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142 |
|
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143 |
return 0; |
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144 |
} |
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145 |
|
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146 |
/** |
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147 |
* Write out the cache header into the opened file |
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148 |
*/ |
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149 |
static int pt_cache_write_header (struct pt_cache *cache, const struct pt_cache_header *header) |
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150 |
{ |
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151 |
size_t len = sizeof(*header); |
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152 |
const char *buf = (const char *) header; |
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153 |
|
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154 |
// seek to start |
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155 |
if (lseek(cache->fd, 0, SEEK_SET) != 0) |
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156 |
return -1; |
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157 |
|
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158 |
// write out full header |
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159 |
while (len) { |
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160 |
ssize_t ret; |
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161 |
|
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162 |
// try and write out the header |
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163 |
if ((ret = write(cache->fd, buf, len)) < 0) |
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164 |
return -1; |
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165 |
|
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166 |
// update offset |
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167 |
buf += ret; |
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168 |
len -= ret; |
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169 |
} |
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170 |
|
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171 |
// done |
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172 |
return 0; |
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173 |
} |
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174 |
|
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175 |
/** |
0 | 176 |
* Create a new cache file, open it, and write out the header. |
177 |
*/ |
|
1
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178 |
static int pt_cache_open_create (struct pt_cache *cache, struct pt_cache_header *header) |
0 | 179 |
{ |
2 | 180 |
// no access |
181 |
if (!(cache->mode & PT_IMG_WRITE)) { |
|
182 |
errno = EPERM; |
|
183 |
return -1; |
|
184 |
} |
|
185 |
||
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186 |
// open |
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187 |
if (pt_cache_open_fd(cache, &cache->fd)) |
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188 |
return -1; |
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189 |
|
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190 |
// calculate data size |
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191 |
cache->size = sizeof(*header) + header->height * header->row_bytes; |
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192 |
|
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193 |
// grow file |
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194 |
if (ftruncate(cache->fd, PT_CACHE_PAGE + cache->size) < 0) |
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195 |
goto error; |
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196 |
|
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197 |
// open mmap |
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198 |
if (pt_cache_open_mmap(cache, (void **) &cache->mmap)) |
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199 |
goto error; |
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200 |
|
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201 |
// write header |
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202 |
if (pt_cache_write_header(cache, header)) |
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203 |
goto error; |
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|
204 |
|
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|
205 |
// done |
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206 |
return 0; |
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|
207 |
|
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|
208 |
error: |
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|
209 |
// cleanup |
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210 |
pt_cache_abort(cache); |
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211 |
|
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212 |
return -1; |
0 | 213 |
} |
214 |
||
215 |
int pt_cache_update_png (struct pt_cache *cache, png_structp png, png_infop info) |
|
216 |
{ |
|
217 |
struct pt_cache_header header; |
|
1
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|
218 |
|
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219 |
// XXX: check cache_mode |
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220 |
// XXX: check image doesn't use any options we don't handle |
0 | 221 |
|
222 |
memset(&header, 0, sizeof(header)); |
|
223 |
||
224 |
// fill in basic info |
|
1
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225 |
header.width = png_get_image_width(png, info); |
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|
226 |
header.height = png_get_image_height(png, info); |
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227 |
header.bit_depth = png_get_bit_depth(png, info); |
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|
228 |
header.color_type = png_get_color_type(png, info); |
0 | 229 |
|
230 |
// fill in other info |
|
1
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|
231 |
header.row_bytes = png_get_rowbytes(png, info); |
f3cde3db1fef
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|
232 |
|
f3cde3db1fef
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|
233 |
// create and write out header |
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Tero Marttila <terom@fixme.fi>
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|
234 |
if (pt_cache_open_create(cache, &header)) |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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diff
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|
235 |
return -1; |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
parents:
0
diff
changeset
|
236 |
|
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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|
237 |
// XXX: pallette etc. |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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0
diff
changeset
|
238 |
|
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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diff
changeset
|
239 |
// write out raw image data a row at a time |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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diff
changeset
|
240 |
for (size_t row = 0; row < header.height; row++) { |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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|
241 |
// read row data, non-interlaced |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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|
242 |
png_read_row(png, cache->mmap + row * header.row_bytes, NULL); |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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diff
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|
243 |
} |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
parents:
0
diff
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|
244 |
|
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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|
245 |
// done! |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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changeset
|
246 |
return 0; |
0 | 247 |
} |
1
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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diff
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|
248 |
|
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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|
249 |
void pt_cache_destroy (struct pt_cache *cache) |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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|
250 |
{ |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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|
251 |
free(cache->path); |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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|
252 |
|
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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|
253 |
pt_cache_abort(cache); |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
parents:
0
diff
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|
254 |
|
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
parents:
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diff
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|
255 |
free(cache); |
f3cde3db1fef
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Tero Marttila <terom@fixme.fi>
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diff
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|
256 |
} |