author | Claus Gittinger <cg@exept.de> |
Wed, 01 Dec 1999 21:25:19 +0100 | |
changeset 1278 | 0fc24ae3a3e3 |
parent 1094 | b861869852b5 |
child 1558 | 1ae43779327f |
permissions | -rw-r--r-- |
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" |
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COPYRIGHT (c) 1993 by Claus Gittinger |
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All Rights Reserved |
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
|
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other person. No title to or ownership of the software is |
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10 |
hereby transferred. |
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" |
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||
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ImageReader subclass:#JPEGReader |
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instanceVariableNames:'jpeg_decompress_struct jpeg_error_mgr_struct colorComponents |
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forceGrayscale forceDitherMode' |
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classVariableNames:'ErrorPrinting' |
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poolDictionaries:'' |
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category:'Graphics-Images-Support' |
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! |
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!JPEGReader primitiveDefinitions! |
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%{ |
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/* |
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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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#ifdef WIN32 |
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# undef longjmp |
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# undef setjmp |
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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 { |
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struct jpeg_error_mgr pub; |
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jmp_buf setjmp_buffer; |
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}; |
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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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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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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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fprintf(stderr, "%s\n", buffer); |
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} |
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} |
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/* |
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* Optional progress monitor: display a percent-done figure on stderr. |
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*/ |
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#ifdef PROGRESS_REPORT |
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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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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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fprintf(stderr, "\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); |
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} else { |
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fprintf(stderr, "\r %3d%% ", percent_done); |
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} |
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fflush(stderr); |
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} |
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} |
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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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fprintf(stderr, "\r \r"); |
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fflush(stderr); |
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} |
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} |
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#endif |
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%} |
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! ! |
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!JPEGReader class methodsFor:'documentation'! |
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copyright |
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" |
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COPYRIGHT (c) 1993 by Claus Gittinger |
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All Rights Reserved |
16 | 152 |
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21 | 153 |
This software is furnished under a license and may be used |
154 |
only in accordance with the terms of that license and with the |
|
155 |
inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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! |
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documentation |
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" |
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Reader for JPEG images. |
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This uses the libpeg library to read the image |
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Only reading of files is supported. |
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[See also:] |
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Image Form Icon |
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BlitImageReader FaceReader GIFReader PBMReader PCXReader |
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ST80FormReader SunRasterReader TargaReader TIFFReader WindowsIconReader |
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XBMReader XPMReader XWDReader |
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" |
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! ! |
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!JPEGReader class methodsFor:'initialization'! |
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initialize |
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"install myself in the Image classes fileFormat table |
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for the `.jpg' and '.jpeg' extensions." |
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MIMETypes defineImageType:'image/jpeg' suffix:'jpg' reader:self. |
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MIMETypes defineImageType:nil suffix:'jpeg' reader:self. |
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"Modified: 1.2.1997 / 15:01:55 / cg" |
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! ! |
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!JPEGReader class methodsFor:'testing'! |
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isValidImageFile:aFileName |
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"return true, if aFileName contains a JPG image. |
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Only look at the files name here ..." |
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(aFileName asLowercase endsWith:'.jpg') ifTrue:[^ true]. |
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(aFileName asLowercase endsWith:'.jpeg') ifTrue:[^ true]. |
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^ false |
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"Created: 11.4.1997 / 16:26:25 / cg" |
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! ! |
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!JPEGReader methodsFor:'accessing'! |
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forceDitherMode:something |
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"set the dither mode, to one of #none or #ordered" |
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forceDitherMode := something. |
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"Modified: 16.4.1997 / 20:34:59 / cg" |
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! |
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forceGrayscale:something |
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"set the forceGrayscale mode; if true, grayScale images are |
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returned, even if the input contains a color image." |
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forceGrayscale := something. |
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"Created: 16.4.1997 / 20:33:44 / cg" |
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"Modified: 16.4.1997 / 20:34:29 / cg" |
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! ! |
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!JPEGReader methodsFor:'private'! |
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create_jpeg_decompress_struct |
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|errMgrStructSize decompressStructSize fp errorOccurred| |
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fp := inStream filePointer. |
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fp isNil ifTrue:[ |
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self error:'can only read from an external stream'. |
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^ self. |
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]. |
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%{ |
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534 | 235 |
errMgrStructSize = __MKSMALLINT(sizeof(struct my_error_mgr)); |
532 | 236 |
decompressStructSize = __MKSMALLINT(sizeof(struct jpeg_decompress_struct)); |
528 | 237 |
%}. |
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jpeg_error_mgr_struct := ExternalBytes unprotectedNew:errMgrStructSize. |
240 |
jpeg_decompress_struct := ExternalBytes unprotectedNew:decompressStructSize. |
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errorOccurred := false. |
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%{ /* STACK: 200000 */ |
528 | 244 |
struct jpeg_decompress_struct *cinfoPtr; |
534 | 245 |
struct my_error_mgr *jerrPtr; |
528 | 246 |
OBJ j_e_m = __INST(jpeg_error_mgr_struct); |
247 |
OBJ j_d_s = __INST(jpeg_decompress_struct); |
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248 |
FILE *f = __FILEVal(fp); |
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250 |
if (__isExternalBytes(j_d_s) |
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&& __isExternalBytes(j_e_m)) { |
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cinfoPtr = (struct jpeg_decompress_struct *)(__externalBytesAddress(j_d_s)); |
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jerrPtr = (struct my_error_mgr *)(__externalBytesAddress(j_e_m)); |
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/* |
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* Initialize the JPEG decompression object with default error handling. |
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*/ |
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cinfoPtr->err = jpeg_std_error(jerrPtr); |
528 | 259 |
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534 | 260 |
/* |
261 |
* prepare to handle errors smoothly ... |
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262 |
*/ |
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263 |
jerrPtr->pub.error_exit = my_error_exit; |
|
264 |
if (setjmp(jerrPtr->setjmp_buffer)) { |
|
265 |
/* |
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266 |
* error occurred ... |
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267 |
*/ |
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268 |
jpeg_destroy_decompress(cinfoPtr); |
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269 |
RETURN (false); |
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270 |
} |
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/* |
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* use my message print function |
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*/ |
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jerrPtr->pub.output_message = my_output_message; |
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jpeg_create_decompress(cinfoPtr); |
528 | 278 |
#if 0 |
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/* |
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* Insert custom COM marker processor. |
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*/ |
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jpeg_set_marker_processor(cinfoPtr, JPEG_COM, COM_handler); |
528 | 283 |
#endif |
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cinfoPtr->err->trace_level = 0; |
528 | 285 |
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#if 0 |
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/* colors setting */ |
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288 |
cinfoPtr->desired_number_of_colors = val; |
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289 |
cinfoPtr->quantize_colors = TRUE; |
528 | 290 |
#endif |
291 |
#if 0 |
|
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292 |
/* dct setting */ |
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293 |
cinfoPtr->dct_method = JDCT_ISLOW; |
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294 |
or: cinfoPtr->dct_method = JDCT_IFAST; |
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295 |
or: cinfoPtr->dct_method = JDCT_FLOAT; |
528 | 296 |
#endif |
297 |
||
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298 |
/* dither setting */ |
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299 |
cinfoPtr->dither_mode = JDITHER_FS; |
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300 |
if (__INST(forceDitherMode) == @symbol(none)) { |
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301 |
cinfoPtr->dither_mode = JDITHER_NONE; |
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302 |
} else { |
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|
303 |
if (__INST(forceDitherMode) == @symbol(ordered)) { |
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304 |
cinfoPtr->dither_mode = JDITHER_ORDERED; |
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|
305 |
} |
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306 |
} |
528 | 307 |
|
308 |
#if 0 |
|
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309 |
/* fast setting */ |
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|
310 |
cinfoPtr->two_pass_quantize = FALSE; |
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|
311 |
cinfoPtr->dither_mode = JDITHER_ORDERED; |
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|
312 |
cinfoPtr->desired_number_of_colors = 216; |
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|
313 |
cinfoPtr->dct_method = JDCT_FASTEST; |
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|
314 |
cinfoPtr->do_fancy_upsampling = FALSE; |
528 | 315 |
#endif |
316 |
||
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|
317 |
if (__INST(forceGrayscale) == true) { |
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|
318 |
/* grayscale setting */ |
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|
319 |
cinfoPtr->out_color_space = JCS_GRAYSCALE; |
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|
320 |
} |
528 | 321 |
|
322 |
#if 0 |
|
1061
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|
323 |
/* maxmemory setting */ |
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|
324 |
cinfoPtr->mem->max_memory_to_use = lval * 1000L; |
528 | 325 |
#endif |
534 | 326 |
|
528 | 327 |
#if 0 |
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|
328 |
/* nosmooth setting */ |
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|
329 |
cinfoPtr->do_fancy_upsampling = FALSE; |
528 | 330 |
#endif |
534 | 331 |
|
528 | 332 |
#if 0 |
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|
333 |
/* onepass setting */ |
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|
334 |
cinfoPtr->two_pass_quantize = FALSE; |
528 | 335 |
#endif |
336 |
||
1061
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|
337 |
/* Specify data source for decompression */ |
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|
338 |
jpeg_stdio_src(cinfoPtr, f); |
528 | 339 |
|
1061
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|
340 |
/* Read file header, set default decompression parameters */ |
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|
341 |
(void) jpeg_read_header(cinfoPtr, TRUE); |
528 | 342 |
|
1061
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|
343 |
/* Calculate output image dimensions so we can allocate space */ |
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|
344 |
jpeg_calc_output_dimensions(cinfoPtr); |
528 | 345 |
|
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|
346 |
__INST(width) = __MKSMALLINT(cinfoPtr->output_width); |
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|
347 |
__INST(height) = __MKSMALLINT(cinfoPtr->output_height); |
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|
348 |
__INST(colorComponents) = __MKSMALLINT(cinfoPtr->output_components); |
528 | 349 |
|
350 |
#if 0 |
|
1061
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|
351 |
/* could now set additional values in cinfo |
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|
352 |
* (colormap) |
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|
353 |
*/ |
528 | 354 |
#endif |
534 | 355 |
|
528 | 356 |
} |
534 | 357 |
%}. |
358 |
^ true |
|
528 | 359 |
! |
360 |
||
361 |
decompressChunkInto:aByteArray startingAt:index |
|
1080
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declared stack for jpeg functions (they seem to need some)
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|
362 |
%{ /* STACK: 200000 */ |
528 | 363 |
struct jpeg_decompress_struct *cinfoPtr; |
534 | 364 |
struct my_error_mgr *jerrPtr; |
1061
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|
365 |
char *rowPtr = NULL; |
528 | 366 |
OBJ j_d_s = __INST(jpeg_decompress_struct); |
534 | 367 |
OBJ j_e_m = __INST(jpeg_error_mgr_struct); |
528 | 368 |
int num_scanlines; |
369 |
char *rowPointers[4]; |
|
370 |
||
1061
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|
371 |
|
e487ecc3d506
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|
372 |
if (__isByteArray(aByteArray)) { |
e487ecc3d506
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|
373 |
rowPtr = (char *)(__ByteArrayInstPtr(aByteArray)->ba_element); |
e487ecc3d506
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|
374 |
} else if (__isExternalBytes(aByteArray)) { |
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|
375 |
rowPtr = __externalBytesAddress(aByteArray); |
e487ecc3d506
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|
376 |
} |
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|
377 |
|
528 | 378 |
if (__isExternalBytes(j_d_s) |
1061
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|
379 |
&& (rowPtr != NULL) |
534 | 380 |
&& __isExternalBytes(j_e_m)) { |
1061
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|
381 |
cinfoPtr = (struct jpeg_decompress_struct *)(__externalBytesAddress(j_d_s)); |
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|
382 |
jerrPtr = (struct my_error_mgr *)(__externalBytesAddress(j_e_m)); |
528 | 383 |
|
1061
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changeset
|
384 |
rowPtr += __intVal(index) - 1; |
528 | 385 |
|
1061
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|
386 |
rowPointers[0] = rowPtr; |
e487ecc3d506
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diff
changeset
|
387 |
rowPointers[1] = NULL; |
e487ecc3d506
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parents:
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changeset
|
388 |
rowPointers[2] = NULL; |
e487ecc3d506
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parents:
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changeset
|
389 |
rowPointers[3] = NULL; |
e487ecc3d506
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Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
390 |
|
e487ecc3d506
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Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
391 |
if (cinfoPtr->output_scanline < cinfoPtr->output_height) { |
e487ecc3d506
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Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
392 |
if (setjmp(jerrPtr->setjmp_buffer)) { |
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
393 |
/* |
e487ecc3d506
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Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
394 |
* error occurred ... |
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
395 |
*/ |
534 | 396 |
jpeg_destroy_decompress(cinfoPtr); |
397 |
RETURN (__MKSMALLINT(-1)); |
|
398 |
} |
|
1061
e487ecc3d506
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Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
399 |
num_scanlines = jpeg_read_scanlines(cinfoPtr, |
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
400 |
rowPointers, |
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
401 |
1); |
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
402 |
RETURN (__MKSMALLINT(num_scanlines)); |
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
403 |
} |
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
404 |
RETURN (__MKSMALLINT(0)); |
528 | 405 |
} |
406 |
%}. |
|
1061
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
407 |
self halt:'bad arguments'. |
528 | 408 |
! |
409 |
||
410 |
finish_decompress |
|
1080
3be38bb2d33c
declared stack for jpeg functions (they seem to need some)
Claus Gittinger <cg@exept.de>
parents:
1070
diff
changeset
|
411 |
%{ /* STACK: 200000 */ |
536 | 412 |
struct jpeg_decompress_struct *cinfoPtr; |
534 | 413 |
struct my_error_mgr *jerrPtr; |
528 | 414 |
OBJ j_d_s = __INST(jpeg_decompress_struct); |
534 | 415 |
OBJ j_e_m = __INST(jpeg_error_mgr_struct); |
528 | 416 |
|
534 | 417 |
if (__isExternalBytes(j_d_s) |
418 |
&& __isExternalBytes(j_e_m)) { |
|
1061
e487ecc3d506
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Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
419 |
cinfoPtr = (struct jpeg_decompress_struct *)(__externalBytesAddress(j_d_s)); |
534 | 420 |
jerrPtr = (struct my_error_mgr *)(__externalBytesAddress(j_e_m)); |
528 | 421 |
|
534 | 422 |
if (setjmp(jerrPtr->setjmp_buffer)) { |
423 |
jpeg_destroy_decompress(cinfoPtr); |
|
424 |
RETURN (false); |
|
425 |
} |
|
426 |
||
1061
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
427 |
/* finish decompressor */ |
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
428 |
(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
|
429 |
(void) jpeg_destroy_decompress(cinfoPtr); |
534 | 430 |
RETURN (true); |
528 | 431 |
} |
432 |
%} |
|
433 |
! |
|
434 |
||
535 | 435 |
get_error_message |
436 |
%{ |
|
536 | 437 |
struct jpeg_decompress_struct *cinfoPtr; |
535 | 438 |
OBJ j_d_s = __INST(jpeg_decompress_struct); |
439 |
char buffer[JMSG_LENGTH_MAX+1]; |
|
440 |
||
441 |
if (__isExternalBytes(j_d_s)) { |
|
536 | 442 |
cinfoPtr = (struct jpeg_decompress_struct *)(__externalBytesAddress(j_d_s)); |
535 | 443 |
|
444 |
(*cinfoPtr->err->format_message) (cinfoPtr, buffer); |
|
445 |
buffer[JMSG_LENGTH_MAX] = '\0'; |
|
446 |
RETURN ( __MKSTRING(buffer)); |
|
447 |
} |
|
448 |
%}. |
|
449 |
^ nil |
|
450 |
! |
|
451 |
||
528 | 452 |
start_decompress |
1080
3be38bb2d33c
declared stack for jpeg functions (they seem to need some)
Claus Gittinger <cg@exept.de>
parents:
1070
diff
changeset
|
453 |
%{ /* STACK: 200000 */ |
536 | 454 |
struct jpeg_decompress_struct *cinfoPtr; |
534 | 455 |
struct my_error_mgr *jerrPtr; |
528 | 456 |
OBJ j_d_s = __INST(jpeg_decompress_struct); |
534 | 457 |
OBJ j_e_m = __INST(jpeg_error_mgr_struct); |
528 | 458 |
|
534 | 459 |
if (__isExternalBytes(j_d_s) |
460 |
&& __isExternalBytes(j_e_m)) { |
|
1061
e487ecc3d506
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Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
461 |
cinfoPtr = (struct jpeg_decompress_struct *)(__externalBytesAddress(j_d_s)); |
534 | 462 |
jerrPtr = (struct my_error_mgr *)(__externalBytesAddress(j_e_m)); |
463 |
||
464 |
if (setjmp(jerrPtr->setjmp_buffer)) { |
|
465 |
jpeg_destroy_decompress(cinfoPtr); |
|
466 |
RETURN (false); |
|
467 |
} |
|
528 | 468 |
|
1061
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
469 |
/* Start decompressor */ |
e487ecc3d506
define my own error printing function (req'd to avoid bad
Claus Gittinger <cg@exept.de>
parents:
951
diff
changeset
|
470 |
(void) jpeg_start_decompress(cinfoPtr); |
534 | 471 |
RETURN (true); |
528 | 472 |
} |
473 |
%} |
|
474 |
! ! |
|
475 |
||
476 |
!JPEGReader methodsFor:'reading from stream'! |
|
477 |
||
478 |
fromStream:aStream |
|
479 |
"read a JPG image from a stream" |
|
480 |
||
951
de8417214dfd
read from an internal stream (save to tempfile, then read)
Claus Gittinger <cg@exept.de>
parents:
895
diff
changeset
|
481 |
|dataIdx bytesPerRow returnCode pos1 ok tmpFile s| |
528 | 482 |
|
895
ebac67edf08e
check for inStream being an external stream.
Claus Gittinger <cg@exept.de>
parents:
669
diff
changeset
|
483 |
aStream isExternalStream ifFalse:[ |
1070
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
484 |
"/ 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
|
485 |
|
1070
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
486 |
tmpFile := Filename newTemporary. |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
487 |
[ |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
488 |
s := tmpFile writeStream binary. |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
489 |
s nextPutAll:aStream contents. |
9c845473f95d
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Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
490 |
s close. |
9c845473f95d
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Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
491 |
s := tmpFile readStream binary. |
9c845473f95d
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Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
492 |
^ self fromStream:s. |
9c845473f95d
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Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
493 |
] valueNowOrOnUnwindDo:[ |
9c845473f95d
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Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
494 |
s notNil ifTrue:[s close]. |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
495 |
tmpFile delete. |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
496 |
]. |
951
de8417214dfd
read from an internal stream (save to tempfile, then read)
Claus Gittinger <cg@exept.de>
parents:
895
diff
changeset
|
497 |
|
1070
9c845473f95d
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parents:
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diff
changeset
|
498 |
"/ 'JPEGReader [info]: can only read from real streams' infoPrintCR. |
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parents:
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changeset
|
499 |
"/ ^ nil |
895
ebac67edf08e
check for inStream being an external stream.
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
500 |
]. |
ebac67edf08e
check for inStream being an external stream.
Claus Gittinger <cg@exept.de>
parents:
669
diff
changeset
|
501 |
|
528 | 502 |
inStream := aStream. |
669
d38a796ad10b
care for files with 128 byte header before actual image
Claus Gittinger <cg@exept.de>
parents:
647
diff
changeset
|
503 |
pos1 := inStream position. |
528 | 504 |
|
895
ebac67edf08e
check for inStream being an external stream.
Claus Gittinger <cg@exept.de>
parents:
669
diff
changeset
|
505 |
|
535 | 506 |
(self create_jpeg_decompress_struct not |
507 |
or:[self start_decompress not]) ifTrue:[ |
|
1070
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parents:
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diff
changeset
|
508 |
ok := false. |
669
d38a796ad10b
care for files with 128 byte header before actual image
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
509 |
|
1070
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oops - fileName delete; not destroy
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parents:
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diff
changeset
|
510 |
"/ if there was no SOI marker, |
9c845473f95d
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parents:
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diff
changeset
|
511 |
"/ try again, skipping first 128 bytes |
9c845473f95d
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Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
512 |
"/ (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
|
513 |
|
1070
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
514 |
inStream position:pos1. |
9c845473f95d
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Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
515 |
((inStream nextByte ~~ 16rFF) |
9c845473f95d
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Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
516 |
or:[inStream nextByte ~~ 16rD8]) ifTrue:[ |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
517 |
inStream position:pos1 + 128. |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
518 |
((inStream nextByte == 16rFF) |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
519 |
and:[inStream nextByte == 16rD8]) ifTrue:[ |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
520 |
inStream position:pos1 + 128. |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
521 |
ok := self create_jpeg_decompress_struct |
9c845473f95d
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Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
522 |
and:[self start_decompress] |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
523 |
]. |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
524 |
]. |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
525 |
ok ifFalse:[ |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
526 |
'JPEGReader [info]: ' infoPrint. self get_error_message infoPrintCR. |
9c845473f95d
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Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
527 |
^ nil |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
528 |
] |
535 | 529 |
]. |
528 | 530 |
|
531 |
data := ByteArray uninitializedNew:(width * height * colorComponents). |
|
532 |
dataIdx := 1. |
|
533 |
bytesPerRow := colorComponents * width. |
|
534 |
||
534 | 535 |
[(returnCode := self decompressChunkInto:data startingAt:dataIdx) > 0] whileTrue:[ |
1070
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
536 |
"/ got a row in the buffer ... |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
537 |
dataIdx := dataIdx + bytesPerRow |
528 | 538 |
]. |
534 | 539 |
returnCode < 0 ifTrue:[ |
1070
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
540 |
'JPEGReader [info]: ' infoPrint. self get_error_message infoPrintCR. |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
541 |
^ nil |
534 | 542 |
]. |
528 | 543 |
|
535 | 544 |
(self finish_decompress) ifFalse:[ |
1070
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
545 |
'JPEGReader [info]: ' infoPrint. self get_error_message infoPrintCR. |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
546 |
^ nil |
535 | 547 |
]. |
528 | 548 |
|
549 |
colorComponents == 3 ifTrue:[ |
|
1070
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
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diff
changeset
|
550 |
photometric := #rgb. |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
551 |
samplesPerPixel := 3. |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
552 |
bitsPerSample := #(8 8 8). |
528 | 553 |
] ifFalse:[ |
1070
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
554 |
photometric := #blackIs0. |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
555 |
samplesPerPixel := 1. |
9c845473f95d
oops - fileName delete; not destroy
Claus Gittinger <cg@exept.de>
parents:
1061
diff
changeset
|
556 |
bitsPerSample := #(8). |
528 | 557 |
]. |
558 |
||
559 |
" |
|
560 |
JPEGReader fromFile:'../../support/libjpeg-6a/testimg.jpg' |
|
561 |
" |
|
562 |
" |
|
563 |
|stream reader| |
|
564 |
||
565 |
stream := '../../support/libjpeg-6a/testimg.jpg' asFilename readStream. |
|
566 |
reader := JPEGReader new. |
|
567 |
reader forceGrayscale:true. |
|
568 |
reader forceDitherMode:#ordered. |
|
569 |
reader fromStream:stream. |
|
570 |
^ reader image |
|
571 |
" |
|
572 |
||
895
ebac67edf08e
check for inStream being an external stream.
Claus Gittinger <cg@exept.de>
parents:
669
diff
changeset
|
573 |
"Modified: / 4.4.1998 / 18:48:46 / cg" |
528 | 574 |
! ! |
575 |
||
199 | 576 |
!JPEGReader class methodsFor:'documentation'! |
577 |
||
578 |
version |
|
1094
b861869852b5
renamed __new() to __STX___new()
Claus Gittinger <cg@exept.de>
parents:
1083
diff
changeset
|
579 |
^ '$Header: /cvs/stx/stx/libview2/JPEGReader.st,v 1.39 1999-02-12 14:59:12 cg Exp $' |
199 | 580 |
! ! |
581 |
JPEGReader initialize! |