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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:#SunRasterReader
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instanceVariableNames:''
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classVariableNames:''
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poolDictionaries:''
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category:'Graphics-Support'
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!
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SunRasterReader 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/SunRasterReader.st,v 1.8 1994-10-10 02:33:19 claus Exp $
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'!
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!SunRasterReader 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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0
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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/SunRasterReader.st,v 1.8 1994-10-10 02:33:19 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 Sun Raster file images
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"
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! !
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!SunRasterReader class methodsFor:'initialization'!
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initialize
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Image fileFormats at:'.icon' put:self.
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! !
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!SunRasterReader class methodsFor:'testing'!
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isValidImageFile:aFileName
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"return true, if aFileName contains a sunraster image"
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|inStream nr|
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inStream := self streamReadingFile:aFileName.
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inStream isNil ifTrue:[^ false].
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"try sun raster"
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inStream binary.
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((inStream nextWord == 16r59A6)
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and:[inStream nextWord == 16r6A95]) ifTrue: [
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inStream close.
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^ true
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3
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].
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"try sun bitmap image format"
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inStream text.
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inStream reset.
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(inStream skipThroughAll: 'idth') isNil ifTrue: [
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inStream close.
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^ false
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].
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inStream next; skipSeparators.
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nr := Integer readFrom: inStream.
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(nr isNil or:[nr <= 0]) ifTrue: [
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inStream close.
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^ false
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].
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(inStream skipThroughAll: 'eight') isNil ifTrue: [
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inStream close.
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^ false
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].
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inStream next; skipSeparators.
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nr := Integer readFrom: inStream.
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(nr isNil or:[nr <= 0]) ifTrue: [
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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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!SunRasterReader methodsFor:'reading from file'!
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fromFile: aFilename
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| rasterType mapType mapBytes imageWords form depth
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rMap gMap bMap mapLen
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bits a b c index|
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inStream := self class streamReadingFile:aFilename.
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inStream isNil ifTrue:[^ nil].
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inStream binary.
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((inStream nextWord == 16r59A6)
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and:[inStream nextWord == 16r6A95]) ifFalse: [
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inStream close.
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^ self fromSunIconFile:aFilename
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].
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width := inStream nextLong.
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height := inStream nextLong.
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depth := inStream nextLong.
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inStream nextLong. "Ignore the image length since I can't rely on it anyway."
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rasterType _ inStream nextLong.
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mapType := inStream nextLong. "Ignore the raster maptype."
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mapBytes := inStream nextLong.
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depth = 8 ifTrue: [
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mapLen := (mapBytes // 3).
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rMap := ByteArray uninitializedNew:mapLen.
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gMap := ByteArray uninitializedNew:mapLen.
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bMap := ByteArray uninitializedNew:mapLen.
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inStream nextBytes:mapLen into:rMap.
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inStream nextBytes:mapLen into:gMap.
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inStream nextBytes:mapLen into:bMap.
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data := ByteArray uninitializedNew:(width * height).
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inStream nextBytes:(width * height) into:data.
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photometric := #palette.
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samplesPerPixel := 1.
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bitsPerSample := #(8).
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colorMap := Array with:rMap with:gMap with:bMap.
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inStream close.
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^ self
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].
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depth ~~ 1 ifTrue: [
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inStream close.
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self error: 'Raster file is not monochrome'
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].
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form := nil.
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inStream skip: mapBytes. "Skip the color map."
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imageWords _ (width / 16) ceiling * height.
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data := ByteArray uninitializedNew:(imageWords * 2).
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(rasterType between: 0 and: 2) ifFalse: [
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inStream close.
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self error: 'Unknown raster file rasterType'
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].
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(rasterType = 2) ifFalse: [
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"no compression of bytes"
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inStream nextBytes:(imageWords * 2) into:data
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] ifTrue: [
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"run length compression of bytes"
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bits _ ByteArray uninitializedNew: imageWords * 2.
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index := 1.
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a _ inStream next.
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[a notNil] whileTrue: [
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(a = 128) ifFalse: [
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bits at:index put: a.
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index := index + 1
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] ifTrue: [
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b _ inStream next.
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b = 0 ifTrue: [
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bits at:index put:128 .
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index := index + 1
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] ifFalse: [
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c := inStream next.
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1 to:(b+1) do:[:i |
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bits at:index put:c.
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index := index + 1
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]
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]
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].
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a _ inStream next
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].
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1 to: imageWords do: [:i | form bitsWordAt: i put: (bits wordAt: i)]
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].
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photometric := #whiteIs0.
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samplesPerPixel := 1.
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bitsPerSample := #(1).
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inStream close
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"Image fromFile:'../fileIn/bitmaps/founders.im8'"
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!
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fromSunIconFile: aFilename
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|index word
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w "{ Class: SmallInteger }"
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h "{ Class: SmallInteger }"|
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inStream := self class streamReadingFile:aFilename.
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inStream isNil ifTrue:[^ nil].
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(inStream skipThroughAll:'idth') isNil ifTrue: [
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'Not a Sun Raster/Icon File' errorPrintNewline.
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inStream close.
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^nil
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].
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inStream next; skipSeparators. "skip $="
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width := Integer readFrom: inStream.
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(width isNil or:[width <= 0]) ifTrue: [
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'format error (expected number)' errorPrintNewline.
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inStream close.
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^ nil
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].
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w := width.
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(inStream skipThroughAll:'eight') isNil ifTrue: [
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'format error (expected height)' errorPrintNewline.
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inStream close.
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^ nil
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].
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inStream next; skipSeparators. "skip $="
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height := Integer readFrom: inStream.
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(height isNil or:[height <= 0]) ifTrue: [
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'format error (expected number)' errorPrintNewline.
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inStream close.
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^nil
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].
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h := height.
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data := ByteArray uninitializedNew:((width + 7 // 8) * height).
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photometric := #whiteIs0.
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samplesPerPixel := 1.
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bitsPerSample := #(1).
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index := 0.
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1 to:h do: [:row |
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1 to: (w + 15 // 16) do: [:col |
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"rows are rounded up to next multiple of 16 bits"
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(inStream skipThroughAll:'0x') isNil ifTrue: [^ nil].
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word := Integer readFrom:inStream radix:16.
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word isNil ifTrue:[
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'format error' errorPrintNewline.
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inStream close.
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^ nil
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].
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data at: (index _ index + 1) put: (word bitShift:-8).
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data at: (index _ index + 1) put: (word bitAnd:16rFF).
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]
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].
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inStream close.
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! !
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