author | Claus Gittinger <cg@exept.de> |
Mon, 12 Dec 2011 21:25:19 +0100 | |
changeset 2973 | b708ff319811 |
parent 2972 | c9b3ef795181 |
child 2974 | 9d47730e05e0 |
permissions | -rw-r--r-- |
6 | 1 |
" |
2 |
COPYRIGHT (c) 1993 by Claus Gittinger |
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28 | 3 |
All Rights Reserved |
6 | 4 |
|
5 |
This software is furnished under a license and may be used |
|
6 |
only in accordance with the terms of that license and with the |
|
7 |
inclusion of the above copyright notice. This software may not |
|
8 |
be provided or otherwise made available to, or used by, any |
|
9 |
other person. No title to or ownership of the software is |
|
10 |
hereby transferred. |
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11 |
" |
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#valueNowOrOnUnwindDo: -> #ensure:
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"{ Package: 'stx:libview2' }" |
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2 | 14 |
ImageReader subclass:#JPEGReader |
537 | 15 |
instanceVariableNames:'jpeg_decompress_struct jpeg_error_mgr_struct colorComponents |
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forceGrayscale forceDitherMode app1SegmentHandler' |
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classVariableNames:'ErrorPrinting' |
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poolDictionaries:'' |
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category:'Graphics-Images-Readers' |
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! |
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!JPEGReader primitiveDefinitions! |
23 |
%{ |
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25 |
/* |
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* includes, defines, structure definitions |
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* and typedefs come here. |
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*/ |
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#include <stdio.h> |
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#ifdef sunos |
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# include <sys/types.h> |
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#endif |
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#include <jpeglib.h> |
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#include <jerror.h> |
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struct my_error_mgr { |
40 |
struct jpeg_error_mgr pub; |
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jmp_buf setjmp_buffer; |
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42 |
}; |
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%} |
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! ! |
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!JPEGReader primitiveFunctions! |
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%{ |
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/* |
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* any local C (helper) functions |
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* come here (please, define as static) |
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*/ |
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static |
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my_error_exit(cinfo) |
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j_common_ptr cinfo; |
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{ |
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struct my_error_mgr *myerrPtr = (struct my_error_mgr *) cinfo->err; |
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if (@global(ErrorPrinting) == true) { |
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console_fprintf(stderr, "JPEGReader [warning]: jpeg error\n"); |
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} |
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longjmp(myerrPtr->setjmp_buffer, 1); |
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} |
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static |
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my_output_message(cinfo) |
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j_common_ptr cinfo; |
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{ |
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char buffer[JMSG_LENGTH_MAX]; |
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if (@global(ErrorPrinting) == true) { |
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console_fprintf(stderr, "libJPEG [error]: "); |
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/* Create the message */ |
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(*cinfo->err->format_message) (cinfo, buffer); |
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/* Send it to stderr, adding a newline */ |
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console_fprintf(stderr, "%s\n", buffer); |
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} |
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} |
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/* |
85 |
* Optional progress monitor: display a percent-done figure on stderr. |
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*/ |
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87 |
||
88 |
#ifdef PROGRESS_REPORT |
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||
90 |
void |
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JPG_progress_monitor (j_common_ptr cinfo) |
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{ |
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cd_progress_ptr prog = (cd_progress_ptr) cinfo->progress; |
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int total_passes = prog->pub.total_passes + prog->total_extra_passes; |
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int percent_done = (int) (prog->pub.pass_counter*100L/prog->pub.pass_limit); |
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97 |
if (percent_done != prog->percent_done) { |
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prog->percent_done = percent_done; |
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if (total_passes > 1) { |
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console_fprintf("\rPass %d/%d: %3d%% ", |
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prog->pub.completed_passes + prog->completed_extra_passes + 1, |
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total_passes, percent_done); |
528 | 103 |
} else { |
2283 | 104 |
console_fprintf("\r %3d%% ", percent_done); |
528 | 105 |
} |
2283 | 106 |
console_fflush(stderr); |
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} |
108 |
} |
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111 |
void |
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JPG_start_progress_monitor (j_common_ptr cinfo, cd_progress_ptr progress) |
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{ |
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/* Enable progress display, unless trace output is on */ |
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if (cinfo->err->trace_level == 0) { |
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progress->pub.progress_monitor = progress_monitor; |
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progress->completed_extra_passes = 0; |
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progress->total_extra_passes = 0; |
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progress->percent_done = -1; |
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cinfo->progress = &progress->pub; |
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} |
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} |
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void |
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JPG_end_progress_monitor (j_common_ptr cinfo) |
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{ |
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/* Clear away progress display */ |
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if (cinfo->err->trace_level == 0) { |
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console_fprintf(stderr, "\r \r"); |
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} |
132 |
} |
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#endif /* PROGRESS_REPORT */ |
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/* fetch a byte from the stream */ |
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unsigned int |
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JPG_jpeg_getc (j_decompress_ptr cinfo) |
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/* Read next byte */ |
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{ |
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struct jpeg_source_mgr *datasrc = cinfo->src; |
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|
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if (datasrc->bytes_in_buffer == 0) { |
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if (! (*datasrc->fill_input_buffer) (cinfo)) |
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return -1; |
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} |
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datasrc->bytes_in_buffer--; |
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return (*datasrc->next_input_byte++) & 0xFF; |
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} |
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%} |
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! ! |
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!JPEGReader class methodsFor:'documentation'! |
156 |
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157 |
copyright |
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158 |
" |
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159 |
COPYRIGHT (c) 1993 by Claus Gittinger |
|
28 | 160 |
All Rights Reserved |
16 | 161 |
|
21 | 162 |
This software is furnished under a license and may be used |
163 |
only in accordance with the terms of that license and with the |
|
164 |
inclusion of the above copyright notice. This software may not |
|
165 |
be provided or otherwise made available to, or used by, any |
|
166 |
other person. No title to or ownership of the software is |
|
167 |
hereby transferred. |
|
168 |
" |
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169 |
! |
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16 | 170 |
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21 | 171 |
documentation |
172 |
" |
|
173 |
Reader for JPEG images. |
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199 | 174 |
|
532 | 175 |
This uses the libpeg library to read the image |
199 | 176 |
|
177 |
Only reading of files is supported. |
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178 |
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179 |
[See also:] |
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180 |
Image Form Icon |
2282 | 181 |
BlitImageReader FaceReader GIFReader PBMReader PCXReader |
182 |
ST80FormReader SunRasterReader TargaReader TIFFReader WindowsIconReader |
|
183 |
XBMReader XPMReader XWDReader |
|
21 | 184 |
" |
185 |
! ! |
|
16 | 186 |
|
28 | 187 |
!JPEGReader class methodsFor:'initialization'! |
188 |
||
189 |
initialize |
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199 | 190 |
"install myself in the Image classes fileFormat table |
398 | 191 |
for the `.jpg' and '.jpeg' extensions." |
199 | 192 |
|
647 | 193 |
MIMETypes defineImageType:'image/jpeg' suffix:'jpg' reader:self. |
194 |
MIMETypes defineImageType:nil suffix:'jpeg' reader:self. |
|
199 | 195 |
|
398 | 196 |
"Modified: 1.2.1997 / 15:01:55 / cg" |
28 | 197 |
! ! |
198 |
||
522 | 199 |
!JPEGReader class methodsFor:'testing'! |
200 |
||
2768 | 201 |
isValidImageFile:aFilenameOrString |
522 | 202 |
"return true, if aFileName contains a JPG image. |
203 |
Only look at the files name here ..." |
|
204 |
||
2768 | 205 |
|suffix| |
206 |
||
207 |
suffix := aFilenameOrString asFilename suffix asLowercase. |
|
208 |
^ suffix = 'jpg' or:[suffix = 'jpeg']. |
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522 | 209 |
|
210 |
"Created: 11.4.1997 / 16:26:25 / cg" |
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2768 | 211 |
|
212 |
" |
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213 |
self isValidImageFile:'xxx.jpg' |
|
214 |
" |
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2 | 215 |
! ! |
199 | 216 |
|
528 | 217 |
!JPEGReader methodsFor:'accessing'! |
218 |
||
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app1SegmentHandler:aBlock |
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"set a handler block for app1 segment data (geolocation in exif format)" |
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221 |
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222 |
app1SegmentHandler := aBlock |
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! |
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224 |
|
528 | 225 |
forceDitherMode:something |
226 |
"set the dither mode, to one of #none or #ordered" |
|
227 |
||
228 |
forceDitherMode := something. |
|
229 |
||
230 |
"Modified: 16.4.1997 / 20:34:59 / cg" |
|
231 |
! |
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232 |
||
233 |
forceGrayscale:something |
|
234 |
"set the forceGrayscale mode; if true, grayScale images are |
|
235 |
returned, even if the input contains a color image." |
|
236 |
||
237 |
forceGrayscale := something. |
|
238 |
||
239 |
"Created: 16.4.1997 / 20:33:44 / cg" |
|
240 |
"Modified: 16.4.1997 / 20:34:29 / cg" |
|
241 |
! ! |
|
242 |
||
243 |
!JPEGReader methodsFor:'private'! |
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244 |
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245 |
app1SegmentCallback |
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"return a callback function which invokes the app1SegmentHandlerBlock if defined. |
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247 |
This will be called to handle the exif segment, containing geolocation tags. |
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Return nil, if there is no handler blcok defined" |
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|
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|cb| |
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app1SegmentHandler isNil ifTrue:[^ nil]. |
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253 |
|
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254 |
cb := ExternalFunctionCallback new. |
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255 |
cb returnType:#bool argumentTypes:#(pointer). |
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256 |
cb generateClosure. |
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257 |
cb action:[:args | self fetchApp1SegmentData. true]. |
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258 |
^ cb code. 'can be passed to C'. |
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259 |
! |
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|
260 |
|
528 | 261 |
create_jpeg_decompress_struct |
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|errMgrStructSize decompressStructSize fp errorOccurred app1SegmentCallbackFunction| |
528 | 263 |
|
264 |
fp := inStream filePointer. |
|
265 |
fp isNil ifTrue:[ |
|
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self error:'can only read from an external stream'. |
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267 |
^ self. |
528 | 268 |
]. |
269 |
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app1SegmentCallbackFunction := self app1SegmentCallback. |
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271 |
|
528 | 272 |
%{ |
2050 | 273 |
errMgrStructSize = __mkSmallInteger(sizeof(struct my_error_mgr)); |
274 |
decompressStructSize = __mkSmallInteger(sizeof(struct jpeg_decompress_struct)); |
|
528 | 275 |
%}. |
276 |
||
532 | 277 |
jpeg_error_mgr_struct := ExternalBytes unprotectedNew:errMgrStructSize. |
278 |
jpeg_decompress_struct := ExternalBytes unprotectedNew:decompressStructSize. |
|
534 | 279 |
errorOccurred := false. |
528 | 280 |
|
1698 | 281 |
%{ /* STACK: 400000 */ |
528 | 282 |
struct jpeg_decompress_struct *cinfoPtr; |
534 | 283 |
struct my_error_mgr *jerrPtr; |
528 | 284 |
OBJ j_e_m = __INST(jpeg_error_mgr_struct); |
285 |
OBJ j_d_s = __INST(jpeg_decompress_struct); |
|
286 |
FILE *f = __FILEVal(fp); |
|
287 |
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288 |
if (__isExternalBytesLike(j_d_s) |
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289 |
&& __isExternalBytesLike(j_e_m)) { |
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290 |
cinfoPtr = (struct jpeg_decompress_struct *)(__externalBytesAddress(j_d_s)); |
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291 |
jerrPtr = (struct my_error_mgr *)(__externalBytesAddress(j_e_m)); |
528 | 292 |
|
2282 | 293 |
/* |
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294 |
* Initialize the JPEG decompression object with default error handling. |
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295 |
*/ |
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296 |
cinfoPtr->err = jpeg_std_error(jerrPtr); |
528 | 297 |
|
534 | 298 |
/* |
299 |
* prepare to handle errors smoothly ... |
|
300 |
*/ |
|
301 |
jerrPtr->pub.error_exit = my_error_exit; |
|
302 |
if (setjmp(jerrPtr->setjmp_buffer)) { |
|
2282 | 303 |
/* |
534 | 304 |
* error occurred ... |
305 |
*/ |
|
306 |
jpeg_destroy_decompress(cinfoPtr); |
|
307 |
RETURN (false); |
|
308 |
} |
|
309 |
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310 |
/* |
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311 |
* use my message print function |
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312 |
*/ |
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313 |
jerrPtr->pub.output_message = my_output_message; |
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314 |
|
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315 |
jpeg_create_decompress(cinfoPtr); |
528 | 316 |
#if 0 |
2282 | 317 |
/* |
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318 |
* Insert custom COM marker processor. |
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319 |
*/ |
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320 |
jpeg_set_marker_processor(cinfoPtr, JPEG_COM, COM_handler); |
528 | 321 |
#endif |
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322 |
if (app1SegmentCallbackFunction != nil) { |
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323 |
jpeg_marker_parser_method cb = NULL; |
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324 |
|
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325 |
if (__isExternalFunction(app1SegmentCallbackFunction)) { |
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326 |
cb = (jpeg_marker_parser_method)__externalFunctionVal(app1SegmentCallbackFunction); |
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327 |
} else if (__isExternalAddress(app1SegmentCallbackFunction)) { |
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|
328 |
cb = (jpeg_marker_parser_method)__externalAddressVal(app1SegmentCallbackFunction); |
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329 |
} else { |
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|
330 |
/* ignore, but should report an error... */ |
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331 |
} |
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|
332 |
jpeg_set_marker_processor(cinfoPtr, JPEG_APP0+1, cb); |
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333 |
} |
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|
334 |
|
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335 |
cinfoPtr->err->trace_level = 0; |
528 | 336 |
|
337 |
#if 0 |
|
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338 |
/* colors setting */ |
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339 |
cinfoPtr->desired_number_of_colors = val; |
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340 |
cinfoPtr->quantize_colors = TRUE; |
528 | 341 |
#endif |
342 |
#if 0 |
|
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343 |
/* dct setting */ |
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344 |
cinfoPtr->dct_method = JDCT_ISLOW; |
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345 |
or: cinfoPtr->dct_method = JDCT_IFAST; |
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|
346 |
or: cinfoPtr->dct_method = JDCT_FLOAT; |
528 | 347 |
#endif |
348 |
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349 |
/* dither setting */ |
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350 |
cinfoPtr->dither_mode = JDITHER_FS; |
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|
351 |
if (__INST(forceDitherMode) == @symbol(none)) { |
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|
352 |
cinfoPtr->dither_mode = JDITHER_NONE; |
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|
353 |
} else { |
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|
354 |
if (__INST(forceDitherMode) == @symbol(ordered)) { |
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|
355 |
cinfoPtr->dither_mode = JDITHER_ORDERED; |
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|
356 |
} |
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|
357 |
} |
528 | 358 |
|
359 |
#if 0 |
|
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|
360 |
/* fast setting */ |
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|
361 |
cinfoPtr->two_pass_quantize = FALSE; |
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|
362 |
cinfoPtr->dither_mode = JDITHER_ORDERED; |
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|
363 |
cinfoPtr->desired_number_of_colors = 216; |
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|
364 |
cinfoPtr->dct_method = JDCT_FASTEST; |
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|
365 |
cinfoPtr->do_fancy_upsampling = FALSE; |
528 | 366 |
#endif |
367 |
||
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|
368 |
if (__INST(forceGrayscale) == true) { |
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|
369 |
/* grayscale setting */ |
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|
370 |
cinfoPtr->out_color_space = JCS_GRAYSCALE; |
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|
371 |
} |
528 | 372 |
|
373 |
#if 0 |
|
1061
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|
374 |
/* maxmemory setting */ |
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|
375 |
cinfoPtr->mem->max_memory_to_use = lval * 1000L; |
528 | 376 |
#endif |
534 | 377 |
|
528 | 378 |
#if 0 |
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|
379 |
/* nosmooth setting */ |
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|
380 |
cinfoPtr->do_fancy_upsampling = FALSE; |
528 | 381 |
#endif |
534 | 382 |
|
528 | 383 |
#if 0 |
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|
384 |
/* onepass setting */ |
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|
385 |
cinfoPtr->two_pass_quantize = FALSE; |
528 | 386 |
#endif |
387 |
||
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|
388 |
/* Specify data source for decompression */ |
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|
389 |
jpeg_stdio_src(cinfoPtr, f); |
528 | 390 |
|
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|
391 |
/* Read file header, set default decompression parameters */ |
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|
392 |
(void) jpeg_read_header(cinfoPtr, TRUE); |
528 | 393 |
|
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|
394 |
/* Calculate output image dimensions so we can allocate space */ |
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|
395 |
jpeg_calc_output_dimensions(cinfoPtr); |
528 | 396 |
|
2050 | 397 |
__INST(width) = __mkSmallInteger(cinfoPtr->output_width); |
398 |
__INST(height) = __mkSmallInteger(cinfoPtr->output_height); |
|
399 |
__INST(colorComponents) = __mkSmallInteger(cinfoPtr->output_components); |
|
528 | 400 |
|
401 |
#if 0 |
|
1061
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|
402 |
/* could now set additional values in cinfo |
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|
403 |
* (colormap) |
e487ecc3d506
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|
404 |
*/ |
528 | 405 |
#endif |
534 | 406 |
|
528 | 407 |
} |
534 | 408 |
%}. |
409 |
^ true |
|
528 | 410 |
! |
411 |
||
412 |
decompressChunkInto:aByteArray startingAt:index |
|
1698 | 413 |
%{ /* STACK: 400000 */ |
528 | 414 |
struct jpeg_decompress_struct *cinfoPtr; |
534 | 415 |
struct my_error_mgr *jerrPtr; |
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|
416 |
char *rowPtr = NULL; |
528 | 417 |
OBJ j_d_s = __INST(jpeg_decompress_struct); |
534 | 418 |
OBJ j_e_m = __INST(jpeg_error_mgr_struct); |
528 | 419 |
int num_scanlines; |
420 |
char *rowPointers[4]; |
|
421 |
||
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|
422 |
|
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|
423 |
if (__isByteArray(aByteArray)) { |
1747
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|
424 |
rowPtr = (char *)(__ByteArrayInstPtr(aByteArray)->ba_element); |
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|
425 |
} else if (__isExternalBytesLike(aByteArray)) { |
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|
426 |
rowPtr = __externalBytesAddress(aByteArray); |
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|
427 |
} |
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|
428 |
|
1747
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|
429 |
if (__isExternalBytesLike(j_d_s) |
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|
430 |
&& (rowPtr != NULL) |
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|
431 |
&& __isExternalBytesLike(j_e_m)) { |
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|
432 |
cinfoPtr = (struct jpeg_decompress_struct *)(__externalBytesAddress(j_d_s)); |
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|
433 |
jerrPtr = (struct my_error_mgr *)(__externalBytesAddress(j_e_m)); |
528 | 434 |
|
1061
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|
435 |
rowPtr += __intVal(index) - 1; |
528 | 436 |
|
1061
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|
437 |
rowPointers[0] = rowPtr; |
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|
438 |
rowPointers[1] = NULL; |
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|
439 |
rowPointers[2] = NULL; |
e487ecc3d506
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|
440 |
rowPointers[3] = NULL; |
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
441 |
|
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
442 |
if (cinfoPtr->output_scanline < cinfoPtr->output_height) { |
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
443 |
if (setjmp(jerrPtr->setjmp_buffer)) { |
2282 | 444 |
/* |
1061
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
445 |
* error occurred ... |
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
446 |
*/ |
534 | 447 |
jpeg_destroy_decompress(cinfoPtr); |
2050 | 448 |
RETURN (__mkSmallInteger(-1)); |
534 | 449 |
} |
2282 | 450 |
num_scanlines = jpeg_read_scanlines(cinfoPtr, |
1061
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
451 |
rowPointers, |
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
452 |
1); |
2050 | 453 |
RETURN (__mkSmallInteger(num_scanlines)); |
1061
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
454 |
} |
2050 | 455 |
RETURN (__mkSmallInteger(0)); |
528 | 456 |
} |
457 |
%}. |
|
1061
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
458 |
self halt:'bad arguments'. |
528 | 459 |
! |
460 |
||
2972 | 461 |
extractApp1DataFrom:data |
462 |
(data startsWith:#[16r45 16r78 16r69 16r66 16r0] " = 'Exif' + 0-byte" ) ifTrue:[ |
|
463 |
self extractExifDataFrom:data. |
|
464 |
]. |
|
465 |
||
466 |
"Created: / 12-12-2011 / 21:22:23 / cg" |
|
467 |
! |
|
468 |
||
469 |
extractExifDataFrom:data |
|
470 |
self halt |
|
471 |
||
472 |
"Created: / 12-12-2011 / 21:22:32 / cg" |
|
473 |
! |
|
474 |
||
475 |
fetchApp1SegmentData |
|
476 |
|byte1 byte2 count| |
|
477 |
||
478 |
byte1 := self jpeg_getc. |
|
479 |
byte2 := self jpeg_getc. |
|
480 |
count := (byte1 bitShift:8) + byte2. "/ msb first |
|
481 |
count := count - 2. "/ count itself is included |
|
482 |
data := ByteArray new:count. |
|
483 |
1 to: count do:[:i | |
|
484 |
data at:i put:(self jpeg_getc). |
|
485 |
]. |
|
486 |
self halt. |
|
487 |
app1SegmentHandler value:data. |
|
488 |
! |
|
489 |
||
528 | 490 |
finish_decompress |
1698 | 491 |
%{ /* STACK: 400000 */ |
536 | 492 |
struct jpeg_decompress_struct *cinfoPtr; |
534 | 493 |
struct my_error_mgr *jerrPtr; |
528 | 494 |
OBJ j_d_s = __INST(jpeg_decompress_struct); |
534 | 495 |
OBJ j_e_m = __INST(jpeg_error_mgr_struct); |
528 | 496 |
|
1747
90a5fcae4b4b
also handle subclasses of externalBytes
Claus Gittinger <cg@exept.de>
parents:
1745
diff
changeset
|
497 |
if (__isExternalBytesLike(j_d_s) |
90a5fcae4b4b
also handle subclasses of externalBytes
Claus Gittinger <cg@exept.de>
parents:
1745
diff
changeset
|
498 |
&& __isExternalBytesLike(j_e_m)) { |
1061
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
499 |
cinfoPtr = (struct jpeg_decompress_struct *)(__externalBytesAddress(j_d_s)); |
534 | 500 |
jerrPtr = (struct my_error_mgr *)(__externalBytesAddress(j_e_m)); |
528 | 501 |
|
534 | 502 |
if (setjmp(jerrPtr->setjmp_buffer)) { |
503 |
jpeg_destroy_decompress(cinfoPtr); |
|
504 |
RETURN (false); |
|
505 |
} |
|
506 |
||
1061
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
507 |
/* finish decompressor */ |
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
508 |
(void) jpeg_finish_decompress(cinfoPtr); |
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
509 |
(void) jpeg_destroy_decompress(cinfoPtr); |
534 | 510 |
RETURN (true); |
528 | 511 |
} |
512 |
%} |
|
513 |
! |
|
514 |
||
535 | 515 |
get_error_message |
516 |
%{ |
|
536 | 517 |
struct jpeg_decompress_struct *cinfoPtr; |
535 | 518 |
OBJ j_d_s = __INST(jpeg_decompress_struct); |
519 |
char buffer[JMSG_LENGTH_MAX+1]; |
|
520 |
||
1747
90a5fcae4b4b
also handle subclasses of externalBytes
Claus Gittinger <cg@exept.de>
parents:
1745
diff
changeset
|
521 |
if (__isExternalBytesLike(j_d_s)) { |
536 | 522 |
cinfoPtr = (struct jpeg_decompress_struct *)(__externalBytesAddress(j_d_s)); |
535 | 523 |
|
524 |
(*cinfoPtr->err->format_message) (cinfoPtr, buffer); |
|
525 |
buffer[JMSG_LENGTH_MAX] = '\0'; |
|
526 |
RETURN ( __MKSTRING(buffer)); |
|
527 |
} |
|
528 |
%}. |
|
529 |
^ nil |
|
530 |
! |
|
531 |
||
2972 | 532 |
jpeg_getc |
533 |
%{ |
|
534 |
OBJ j_d_s = __INST(jpeg_decompress_struct); |
|
535 |
||
536 |
if (__isExternalBytesLike(j_d_s)) { |
|
537 |
struct jpeg_decompress_struct *cinfoPtr; |
|
538 |
int byte; |
|
539 |
||
540 |
cinfoPtr = (struct jpeg_decompress_struct *)(__externalBytesAddress(j_d_s)); |
|
541 |
||
542 |
byte = JPG_jpeg_getc (cinfoPtr); |
|
543 |
RETURN( __MKSMALLINT(byte) ); |
|
544 |
} |
|
545 |
%}. |
|
546 |
self primitiveFailed |
|
547 |
! |
|
548 |
||
528 | 549 |
start_decompress |
1698 | 550 |
%{ /* STACK: 400000 */ |
536 | 551 |
struct jpeg_decompress_struct *cinfoPtr; |
534 | 552 |
struct my_error_mgr *jerrPtr; |
528 | 553 |
OBJ j_d_s = __INST(jpeg_decompress_struct); |
534 | 554 |
OBJ j_e_m = __INST(jpeg_error_mgr_struct); |
528 | 555 |
|
1747
90a5fcae4b4b
also handle subclasses of externalBytes
Claus Gittinger <cg@exept.de>
parents:
1745
diff
changeset
|
556 |
if (__isExternalBytesLike(j_d_s) |
90a5fcae4b4b
also handle subclasses of externalBytes
Claus Gittinger <cg@exept.de>
parents:
1745
diff
changeset
|
557 |
&& __isExternalBytesLike(j_e_m)) { |
1061
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
558 |
cinfoPtr = (struct jpeg_decompress_struct *)(__externalBytesAddress(j_d_s)); |
534 | 559 |
jerrPtr = (struct my_error_mgr *)(__externalBytesAddress(j_e_m)); |
560 |
||
561 |
if (setjmp(jerrPtr->setjmp_buffer)) { |
|
562 |
jpeg_destroy_decompress(cinfoPtr); |
|
563 |
RETURN (false); |
|
564 |
} |
|
528 | 565 |
|
1061
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
566 |
/* Start decompressor */ |
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
567 |
(void) jpeg_start_decompress(cinfoPtr); |
534 | 568 |
RETURN (true); |
528 | 569 |
} |
570 |
%} |
|
571 |
! ! |
|
572 |
||
1805 | 573 |
!JPEGReader methodsFor:'reading'! |
528 | 574 |
|
575 |
fromStream:aStream |
|
576 |
"read a JPG image from a stream" |
|
577 |
||
951
de8417214dfd
read from an internal stream (save to tempfile, then read)
Claus Gittinger <cg@exept.de>
parents:
895
diff
changeset
|
578 |
|dataIdx bytesPerRow returnCode pos1 ok tmpFile s| |
528 | 579 |
|
895
ebac67edf08e
check for inStream being an external stream.
Claus Gittinger <cg@exept.de>
parents:
669
diff
changeset
|
580 |
aStream isExternalStream ifFalse:[ |
2972 | 581 |
"/ libJpeg can only handle real OS-streams |
951
de8417214dfd
read from an internal stream (save to tempfile, then read)
Claus Gittinger <cg@exept.de>
parents:
895
diff
changeset
|
582 |
|
2972 | 583 |
tmpFile := Filename newTemporary. |
584 |
[ |
|
585 |
s := tmpFile writeStream binary. |
|
586 |
s nextPutAll:aStream contents. |
|
587 |
s close. |
|
588 |
s := tmpFile readStream binary. |
|
589 |
^ self fromStream:s. |
|
590 |
] ensure:[ |
|
591 |
s notNil ifTrue:[s close]. |
|
592 |
tmpFile delete. |
|
593 |
]. |
|
2282 | 594 |
|
2972 | 595 |
"/ 'JPEGReader [info]: can only read from real streams' infoPrintCR. |
596 |
"/ ^ nil |
|
895
ebac67edf08e
check for inStream being an external stream.
Claus Gittinger <cg@exept.de>
parents:
669
diff
changeset
|
597 |
]. |
ebac67edf08e
check for inStream being an external stream.
Claus Gittinger <cg@exept.de>
parents:
669
diff
changeset
|
598 |
|
528 | 599 |
inStream := aStream. |
669
d38a796ad10b
care for files with 128 byte header before actual image
Claus Gittinger <cg@exept.de>
parents:
647
diff
changeset
|
600 |
pos1 := inStream position. |
528 | 601 |
|
2972 | 602 |
"/ to extract app1 data (for example, exif geolocation tags), |
603 |
"/ uncomment the following and implement the exif tag reader... |
|
2973
b708ff319811
comment/format in: #fromStream:
Claus Gittinger <cg@exept.de>
parents:
2972
diff
changeset
|
604 |
"/ Warning: this does not yet work as expected. |
b708ff319811
comment/format in: #fromStream:
Claus Gittinger <cg@exept.de>
parents:
2972
diff
changeset
|
605 |
"/ app1SegmentHandler := [:data | self halt. self extractApp1DataFrom:data]. |
895
ebac67edf08e
check for inStream being an external stream.
Claus Gittinger <cg@exept.de>
parents:
669
diff
changeset
|
606 |
|
535 | 607 |
(self create_jpeg_decompress_struct not |
608 |
or:[self start_decompress not]) ifTrue:[ |
|
2972 | 609 |
ok := false. |
669
d38a796ad10b
care for files with 128 byte header before actual image
Claus Gittinger <cg@exept.de>
parents:
647
diff
changeset
|
610 |
|
2972 | 611 |
"/ if there was no SOI marker, |
612 |
"/ try again, skipping first 128 bytes |
|
613 |
"/ (seems to be generated by some jpg writers) |
|
669
d38a796ad10b
care for files with 128 byte header before actual image
Claus Gittinger <cg@exept.de>
parents:
647
diff
changeset
|
614 |
|
2972 | 615 |
inStream position:pos1. |
616 |
((inStream nextByte ~~ 16rFF) |
|
617 |
or:[inStream nextByte ~~ 16rD8]) ifTrue:[ |
|
618 |
inStream position:pos1 + 128. |
|
619 |
((inStream nextByte == 16rFF) |
|
620 |
and:[inStream nextByte == 16rD8]) ifTrue:[ |
|
621 |
inStream position:pos1 + 128. |
|
622 |
ok := self create_jpeg_decompress_struct |
|
623 |
and:[self start_decompress] |
|
624 |
]. |
|
625 |
]. |
|
626 |
ok ifFalse:[ |
|
627 |
'JPEGReader [info]: ' infoPrint. self get_error_message infoPrintCR. |
|
628 |
^ nil |
|
629 |
] |
|
535 | 630 |
]. |
528 | 631 |
|
632 |
data := ByteArray uninitializedNew:(width * height * colorComponents). |
|
633 |
dataIdx := 1. |
|
634 |
bytesPerRow := colorComponents * width. |
|
635 |
||
534 | 636 |
[(returnCode := self decompressChunkInto:data startingAt:dataIdx) > 0] whileTrue:[ |
2972 | 637 |
"/ got a row in the buffer ... |
638 |
dataIdx := dataIdx + bytesPerRow |
|
2282 | 639 |
]. |
534 | 640 |
returnCode < 0 ifTrue:[ |
2972 | 641 |
'JPEGReader [info]: ' infoPrint. self get_error_message infoPrintCR. |
642 |
^ nil |
|
534 | 643 |
]. |
528 | 644 |
|
535 | 645 |
(self finish_decompress) ifFalse:[ |
2972 | 646 |
'JPEGReader [info]: ' infoPrint. self get_error_message infoPrintCR. |
647 |
^ nil |
|
535 | 648 |
]. |
528 | 649 |
|
650 |
colorComponents == 3 ifTrue:[ |
|
2972 | 651 |
photometric := #rgb. |
652 |
samplesPerPixel := 3. |
|
653 |
bitsPerSample := #(8 8 8). |
|
528 | 654 |
] ifFalse:[ |
2972 | 655 |
photometric := #blackIs0. |
656 |
samplesPerPixel := 1. |
|
657 |
bitsPerSample := #(8). |
|
528 | 658 |
]. |
659 |
||
660 |
" |
|
2768 | 661 |
JPEGReader fromFile:'../../support/libjpeg-7/testimg.jpg' |
528 | 662 |
" |
663 |
" |
|
664 |
|stream reader| |
|
665 |
||
2768 | 666 |
stream := '../../support/libjpeg-7/testimg.jpg' asFilename readStream. |
528 | 667 |
reader := JPEGReader new. |
668 |
reader forceGrayscale:true. |
|
669 |
reader forceDitherMode:#ordered. |
|
670 |
reader fromStream:stream. |
|
671 |
^ reader image |
|
672 |
" |
|
673 |
||
2973
b708ff319811
comment/format in: #fromStream:
Claus Gittinger <cg@exept.de>
parents:
2972
diff
changeset
|
674 |
"Modified (comment): / 12-12-2011 / 21:25:09 / cg" |
528 | 675 |
! ! |
676 |
||
199 | 677 |
!JPEGReader class methodsFor:'documentation'! |
678 |
||
679 |
version |
|
2973
b708ff319811
comment/format in: #fromStream:
Claus Gittinger <cg@exept.de>
parents:
2972
diff
changeset
|
680 |
^ '$Header: /cvs/stx/stx/libview2/JPEGReader.st,v 1.53 2011-12-12 20:25:19 cg Exp $' |
2768 | 681 |
! |
682 |
||
683 |
version_CVS |
|
2973
b708ff319811
comment/format in: #fromStream:
Claus Gittinger <cg@exept.de>
parents:
2972
diff
changeset
|
684 |
^ '$Header: /cvs/stx/stx/libview2/JPEGReader.st,v 1.53 2011-12-12 20:25:19 cg Exp $' |
199 | 685 |
! ! |
1745
4fa0fad2a463
code cleanup (colorMap handling)
Claus Gittinger <cg@exept.de>
parents:
1698
diff
changeset
|
686 |
|
199 | 687 |
JPEGReader initialize! |