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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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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 comment:'
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COPYRIGHT (c) 1993 by Claus Gittinger
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All Rights Reserved
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$Header: /cvs/stx/stx/libview2/ST80FormReader.st,v 1.5 1994-11-17 14:29:42 claus Exp $
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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 1.5 1994-11-17 14:29:42 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 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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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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((samplesPerPixel ~~ 1)
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or:[((bitsPerSample at:1) ~~ 1)
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or:[(photometric ~~ #blackIs0) and:[photometric ~~ #whiteIs0]]]) ifTrue:[
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self error:'can only save Depth1Images'.
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outStream close.
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^ nil.
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].
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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 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|
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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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code == 1 ifFalse:[
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inStream close.
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^ false
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].
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inStream close.
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^ true
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! !
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!ST80FormReader methodsFor:'reading from file'!
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fromFile:aFileName
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|nBytes code offsetX offsetY|
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inStream := self class streamReadingFile:aFileName.
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inStream isNil ifTrue:[
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'open error' printNewline.
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^ nil
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].
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inStream binary.
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code := inStream nextWord.
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code isNil ifTrue:[
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inStream close.
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^ nil
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].
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width := inStream nextWord.
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height := inStream nextWord.
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offsetX := inStream nextWord.
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offsetY := inStream nextWord.
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nBytes := width + 15 // 16 * 2 * height.
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data := ByteArray new:nBytes.
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inStream nextBytes:nBytes into:data.
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inStream close.
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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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