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"
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COPYRIGHT (c) 1994 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:#PCXReader
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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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!PCXReader class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1994 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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this class provides methods for loading 8-plane PCX bitmap files.
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201
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Due to not having too many examples for testing, this could fail
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to read some files.
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(especially, I have no uncompressed files for testing).
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Only 8-bit (i.e. 256 color) PCX images are supported.
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Image writing is not supported.
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[See also:]
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BlitImageReader FaceReader GIFReader JPEGReader PBMReader
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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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!PCXReader class methodsFor:'initialization'!
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initialize
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"tell Image-class, that a new fileReader is present
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for the '.pcx' and '.PCX' extensions."
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Image fileFormats at:'.pcx' put:self.
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Image fileFormats at:'.PCX' put:self.
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! !
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!PCXReader class methodsFor:'testing'!
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isValidImageFile:aFilename
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"return true, if aFilename contains a PCX image"
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|count header 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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header := ByteArray uninitializedNew:128.
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count := inStream nextBytes:128 into:header.
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inStream close.
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((count == 128) and:[self isValidPCXHeader:header]) ifFalse:[
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^ false
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].
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^ true
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"Modified: 17.9.1995 / 17:32:07 / claus"
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!
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isValidPCXHeader:aHeader
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"return true, if aHeader looks like a PCX image header"
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"check id"
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((aHeader at:1) ~~ 16r0A) ifTrue:[
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^ false
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].
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"check version"
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(#(0 2 3 5) includes:(aHeader at:2)) ifFalse:[
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^ false
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].
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^ true
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! !
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!PCXReader methodsFor:'reading from file'!
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fromStream:aStream
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"read an image in pcx format from aStream"
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|fileSize header img|
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inStream := aStream.
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inStream binary.
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fileSize := aStream size.
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fileSize < 128 ifTrue:[
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self error:'PCXREADER: short file'.
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^ nil
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].
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header := ByteArray uninitializedNew:128.
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aStream nextBytes:128 into:header.
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(self class isValidPCXHeader:header) ifFalse:[
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self error:'PCXREADER: wrong header'.
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^ nil
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].
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img := self fromStreamWithHeader:header.
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^ img
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!
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fromStreamWithHeader:header
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"read an raw image in pcx format from aStream.
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The header has already been read into the header argument."
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| inDepth version compression nPlanes xmin ymin xmax ymax
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paletteType rawMap rMap gMap bMap
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endIndex "{Class: SmallInteger }"
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srcIndex "{Class: SmallInteger }"
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dstIndex "{Class: SmallInteger }"
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rowIndex "{Class: SmallInteger }"
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h "{Class: SmallInteger }"
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byte "{Class: SmallInteger }"
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nByte "{Class: SmallInteger }"
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srcBytesPerRow "{Class: SmallInteger }"
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value "{Class: SmallInteger }"
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idx2 "{Class: SmallInteger }"
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dataBytes buffer
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bufferIndex "{Class: SmallInteger }"
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bendIndex "{Class: SmallInteger }"
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nBuffer "{Class: SmallInteger }"|
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version := header at:2.
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"/ 'version=' print. version printNL.
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compression := header at:3.
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"/ 'compression=' print. compression printNL.
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(#(0 1) includes:compression) ifFalse:[
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self error:'PCXREADER: unknown compression'.
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^ nil
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].
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inDepth := header at:4.
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"/ 'depth=' print. inDepth printNL.
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nPlanes := header at:66.
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"/ 'planes=' print. nPlanes printNL.
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srcBytesPerRow := header wordAt:67 MSB:false.
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"/ 'srcBytesPerRow=' print. srcBytesPerRow printNL.
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paletteType := header at:69.
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"
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although it would be easy to implement ...
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I have no test pictures for other formats.
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So its not (yet) implemented
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"
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((inDepth ~~ 8) or:[nPlanes ~~ 1]) ifTrue:[
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'PCXReader: depth: ' errorPrint. inDepth errorPrint.
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' planes:' errorPrint. nPlanes errorPrintNL.
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'PCXReader: can only handle 1-plane 256 color images' errorPrintNL.
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^ nil
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].
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xmin := header wordAt:5 MSB:false.
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ymin := header wordAt:7 MSB:false.
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xmax := header wordAt:9 MSB:false.
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ymax := header wordAt:11 MSB:false.
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width := (xmax - xmin + 1).
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height := (ymax - ymin + 1).
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"/ 'width=' print. width printNL.
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"/ 'height=' print. width printNL.
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(version == 2) ifTrue:[
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"read the 16-entry colormap"
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rawMap := ByteArray uninitializedNew:(16*3).
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rawMap replaceFrom:1 to:(16*3) with:header startingAt:17.
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rMap := Array new:16.
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gMap := Array new:16.
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bMap := Array new:16.
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srcIndex := 1.
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1 to:16 do:[:i |
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rMap at:i put:(rawMap at:srcIndex).
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srcIndex := srcIndex + 1.
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gMap at:i put:(rawMap at:srcIndex).
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srcIndex := srcIndex + 1.
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bMap at:i put:(rawMap at:srcIndex).
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srcIndex := srcIndex + 1.
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].
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].
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compression == 1 ifTrue:[
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data := dataBytes := ByteArray uninitializedNew:(height * srcBytesPerRow).
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buffer := ByteArray uninitializedNew:4096.
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bufferIndex := 1.
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bendIndex := 1.
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rowIndex := 1.
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h := height.
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1 to:h do:[:row |
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dstIndex := rowIndex.
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endIndex := dstIndex + srcBytesPerRow.
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[dstIndex < endIndex] whileTrue:[
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bufferIndex == bendIndex ifTrue:[
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nBuffer := inStream nextBytes:4096 into:buffer.
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bufferIndex := 1.
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bendIndex := nBuffer + 1.
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].
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byte := buffer at:bufferIndex.
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bufferIndex := bufferIndex + 1.
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((byte bitAnd:2r11000000) ~~ 2r11000000) ifTrue:[
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dataBytes at:dstIndex put:byte.
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dstIndex := dstIndex + 1.
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] ifFalse:[
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nByte := byte bitAnd:2r00111111.
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bufferIndex == bendIndex ifTrue:[
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nBuffer := inStream nextBytes:4096 into:buffer.
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bufferIndex := 1.
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bendIndex := nBuffer + 1.
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].
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value := buffer at:bufferIndex.
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bufferIndex := bufferIndex + 1.
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idx2 := ((dstIndex + nByte) min:endIndex) - 1.
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dataBytes from:dstIndex to:idx2 put:value.
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dstIndex := dstIndex + nByte.
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].
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].
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rowIndex := endIndex.
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].
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"/ have to compress - above code reads srcBytesPerRow
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"/ (to keep in sync with RLE); but we want width bytesPerRow
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"/ Can compress in the data-area; leftover pixels are simply ignored
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"/ by other image processing code
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"/
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srcBytesPerRow ~~ width ifTrue:[
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dstIndex := width + 1.
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srcIndex := srcBytesPerRow + 1.
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2 to:h do:[:row |
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dataBytes replaceFrom:dstIndex to:dstIndex+width-1 with:dataBytes startingAt:srcIndex.
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dstIndex := dstIndex + width.
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srcIndex := srcIndex + srcBytesPerRow
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]
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].
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nBuffer := endIndex - bufferIndex.
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] ifFalse:[
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201
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"
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actually untested ...
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"
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data := dataBytes := ByteArray uninitializedNew:(height * width).
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srcBytesPerRow ~~ width ifTrue:[
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dstIndex := 1.
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1 to:h do:[:row |
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inStream nextBytes:width into:data startingAt:dstIndex.
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dstIndex := dstIndex + width.
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inStream skip:(srcBytesPerRow - width).
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]
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] ifFalse:[
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inStream nextBytes:(height * width) into:data.
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].
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nBuffer := 0.
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].
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(version == 5) ifTrue:[
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"read the 256-entry colormap"
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27
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nBuffer ~~ 0 ifTrue:[
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byte := buffer at:bufferIndex.
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289 |
bufferIndex := bufferIndex + 1. nBuffer := nBuffer - 1.
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] ifFalse:[
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byte := inStream next
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].
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29
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201
|
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byte == 16r0C ifFalse:[
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'PCXREADER: no valid 256-entry palette (got' errorPrint.
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296 |
byte errorPrint. '; expected ' errorPrint. 16rC0 errorPrint. ')' errorPrintNL.
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297 |
].
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298 |
rawMap := ByteArray uninitializedNew:(256*3).
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299 |
nBuffer ~~ 0 ifTrue:[
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300 |
rawMap replaceFrom:1 to:(256*3) with:buffer startingAt:bufferIndex.
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301 |
nBuffer < (256*3) ifTrue:[
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inStream nextBytes:((256*3)-nBuffer) into:rawMap startingAt:nBuffer+1
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303 |
]
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304 |
] ifFalse:[
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305 |
inStream nextBytes:(256*3) into:rawMap.
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306 |
].
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307 |
rMap := Array new:256.
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308 |
gMap := Array new:256.
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309 |
bMap := Array new:256.
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310 |
srcIndex := 1.
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311 |
1 to:256 do:[:i |
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312 |
rMap at:i put:(rawMap at:srcIndex).
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313 |
srcIndex := srcIndex + 1.
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|
314 |
gMap at:i put:(rawMap at:srcIndex).
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315 |
srcIndex := srcIndex + 1.
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316 |
bMap at:i put:(rawMap at:srcIndex).
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|
317 |
srcIndex := srcIndex + 1.
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|
318 |
].
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27
|
319 |
].
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|
320 |
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|
321 |
photometric := #palette.
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|
322 |
samplesPerPixel := 1.
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|
323 |
bitsPerSample := #(8).
|
|
35
|
324 |
colorMap := Colormap redVector:rMap greenVector:gMap blueVector:bMap.
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|
27
|
325 |
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|
326 |
"
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|
327 |
|i f|
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|
29
|
328 |
i := Image fromFile:'somefile.pcx'.
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|
329 |
i inspect.
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27
|
330 |
"
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|
331 |
! !
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|
332 |
|
|
201
|
333 |
!PCXReader class methodsFor:'documentation'!
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|
334 |
|
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|
335 |
version
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|
336 |
^ '$Header: /cvs/stx/stx/libview2/PCXReader.st,v 1.12 1996-04-23 10:36:29 cg Exp $'
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|
337 |
! !
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27
|
338 |
PCXReader initialize!
|