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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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'From Smalltalk/X, Version:2.10.4 on 18-feb-1995 at 2:18:48 am'!
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ImageReader subclass:#ST80FormReader
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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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!
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!ST80FormReader 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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version
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"
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$Header: /cvs/stx/stx/libview2/ST80FormReader.st,v 1.9 1995-08-30 17:54:15 claus Exp $
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"
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!
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documentation
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"
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this class provides methods for loading and saving st80-bitmap-file images.
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I am not sure, if this format is still supported/used by newer ST-80
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versions; it used to be in 2.x versions (from what can be deduced by some
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bitmaps found in the manchester goodies).
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No writing is supported by this class.
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"
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! !
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!ST80FormReader class methodsFor:'testing'!
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isValidImageFile:aFileName
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"return true, if aFileName contains an st80-bitmap-file image"
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|code inStream ok|
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inStream := self streamReadingFile:aFileName.
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inStream isNil ifTrue:[^ false].
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inStream binary.
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code := inStream nextWord.
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ok := (code == 1).
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inStream close.
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^ ok
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!
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canRepresent:anImage
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"return true, if anImage can be represented in my file format.
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Only B&Wimages are supported."
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|photometric|
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anImage depth ~~ 1 ifTrue:[^ false].
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(((photometric := anImage photometric) ~~ #blackIs0) and:[photometric ~~ #whiteIs0]) ifTrue:[^ false.].
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^ true
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! !
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!ST80FormReader methodsFor:'writing to file'!
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save:image onFile:aFileName
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"save image as XBM file on aFileName"
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(self class canRepresent:image) ifFalse:[
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self error:'can only save Depth1Images'.
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^ nil.
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].
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outStream := FileStream newFileNamed:aFileName.
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outStream isNil ifTrue:[
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'create error' printNewline.
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^ nil
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].
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width := image width.
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height := image height.
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photometric := image photometric.
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samplesPerPixel := image samplesPerPixel.
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bitsPerSample := image bitsPerSample.
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colorMap := image colorMap.
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outStream binary.
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outStream nextPutWord:1.
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outStream nextPutWord:width.
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outStream nextPutWord:height.
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outStream nextPutWord:0.
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outStream nextPutWord:0.
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outStream nextPutBytes:(data size) from:data.
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outStream close
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"ST80FormReader save:(Image fromFile:'bitmaps/SBrowser.xbm') onFile:'test.form'"
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! !
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!ST80FormReader methodsFor:'reading from file'!
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fromStream:aStream
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|nBytes code offsetX offsetY|
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inStream := aStream.
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inStream binary.
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code := inStream nextWord.
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code isNil ifTrue:[
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^ nil
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].
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width := aStream nextWord.
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height := aStream nextWord.
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offsetX := aStream nextWord.
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offsetY := aStream nextWord.
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nBytes := width + 15 // 16 * 2 * height.
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data := ByteArray new:nBytes.
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aStream nextBytes:nBytes into:data.
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photometric := #whiteIs0.
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samplesPerPixel := 1.
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bitsPerSample := #(1)
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"ST80FormReader fromFile:''"
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! !
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