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"
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COPYRIGHT (c) 1995 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:#XWDReader
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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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XWDReader comment:'
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COPYRIGHT (c) 1995 by Claus Gittinger
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All Rights Reserved
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$Header: /cvs/stx/stx/libview2/XWDReader.st,v 1.2 1995-02-18 17:56:08 claus Exp $
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'!
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!XWDReader class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1995 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/XWDReader.st,v 1.2 1995-02-18 17:56:08 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 x-window dump (xwd) images.
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"
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! !
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!XWDReader methodsFor:'image reading'!
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fromStream: aStream
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"read an image in XWD (X Window Dump) format."
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|header nColors palette res colors pad
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srcRowByteSize bytesPerRow bitsPerPixel mask colormapSize depth
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dstIndex|
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aStream binary.
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header := (1 to: 25) collect: [:i | aStream nextLong].
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"skip ..."
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101 to:(header at: 1) do: [:i | aStream next].
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depth := header at: 4.
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width := header at: 5.
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height := header at: 6.
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pad := header at: 11.
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bitsPerPixel := header at: 12.
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bitsPerPixel == 24 ifTrue:[
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bitsPerSample := #(8 8 8).
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samplesPerPixel := 3.
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photometric := #rgb
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] ifFalse:[
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bitsPerSample := Array with:bitsPerPixel.
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samplesPerPixel := 1.
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photometric := #palette
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].
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colormapSize := header at: 19.
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nColors := header at: 20.
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colorMap := Array new:colormapSize.
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1 to:nColors do:[:i |
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|clr|
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aStream nextLong.
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clr := ColorValue scaledRed: (aStream nextWord bitShift: -3)
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scaledGreen: (aStream nextWord bitShift: -3)
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scaledBlue: (aStream nextWord bitShift: -3).
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colorMap at:i put:clr.
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aStream nextWord.
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].
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nColors+1 to:colormapSize do: [:i | colorMap at:i put:Color black].
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bytesPerRow := width * bitsPerPixel // 8.
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((width * bitsPerPixel \\ 8) ~~ 0) ifTrue:[
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bytesPerRow := bytesPerRow + 1
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].
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srcRowByteSize := width * bitsPerPixel + pad - 1 // pad * (pad / 8).
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data := ByteArray uninitializedNew: srcRowByteSize * height.
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srcRowByteSize == bytesPerRow ifTrue:[
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aStream nextBytes:srcRowByteSize * height into:data.
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] ifFalse:[
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dstIndex := 1.
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1 to:height do:[:y |
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aStream nextBytes:bytesPerRow into:data startingAt:dstIndex.
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aStream next:(srcRowByteSize - bytesPerRow).
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dstIndex := dstIndex + bytesPerRow.
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].
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self halt.
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]
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"
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XWDReader fromFile:'testfile.xwd'
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"
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! !
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