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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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hereby transferred.
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"
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2
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ImageReader subclass:#JPEGReader
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instanceVariableNames:''
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classVariableNames:''
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poolDictionaries:''
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category:'Graphics-Images support'
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2
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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
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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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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 is a quick&dirty hack, using the PD djpeg tool to convert
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the JPG image to GIF first, then reads the GIF image using GIFReader.
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Of course, this is slower than it should be. If lots of JPG reading
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is done, this class should be rewritten, to directly call the (C) JPG
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decoding functions.
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Only reading of files is supported.
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CAVEAT:
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you have to have the djpeg program installed.
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[See also:]
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BlitImageReader FaceReader GIFReader PBMReader PCXReader
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ST80FormReader SunRasterReader 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', '.jpeg' and '.JPG' extensions."
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Image fileFormats at:'.jpg' put:self.
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Image fileFormats at:'.jpeg' put:self.
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Image fileFormats at:'.JPG' put:self.
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"Modified: 23.4.1996 / 12:28:03 / cg"
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! !
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!JPEGReader class methodsFor:'reading from file'!
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fromFile:aFileName
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"read a jpg image from a file.
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Make it the easy way: let djpeg convert it to gif,
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then let GIFReader read the file."
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|tempFileName reader|
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tempFileName := '/tmp/img' , (OperatingSystem getProcessId printString).
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'JPEGREADER: converting to gif ..' errorPrintNL.
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(OperatingSystem executeCommand:'djpeg -gif ' , aFileName , ' > ' , tempFileName)
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ifTrue:[
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reader := GIFReader fromFile:tempFileName.
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OperatingSystem executeCommand:'rm ' , tempFileName.
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^ reader
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].
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'JPEGREADER: conversion failed ..' errorPrintNL.
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self warn:'cannot execute jpeg converter: djpeg'.
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^ nil
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"
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JPEGReader fromFile:'bitmaps/testimg.jpg'
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"
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"Modified: 23.4.1996 / 12:30:12 / cg"
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! !
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!JPEGReader class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libview2/JPEGReader.st,v 1.12 1996-04-23 10:30:44 cg Exp $'
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! !
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JPEGReader initialize!
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