author | Claus Gittinger <cg@exept.de> |
Tue, 19 Jun 2018 14:43:47 +0200 | |
changeset 4134 | 92df688b5ffe |
parent 3587 | f6156f8918ea |
permissions | -rw-r--r-- |
" COPYRIGHT (c) 1993 by Claus Gittinger All Rights Reserved This software is furnished under a license and may be used only in accordance with the terms of that license and with the inclusion of the above copyright notice. This software may not be provided or otherwise made available to, or used by, any other person. No title to or ownership of the software is hereby transferred. " "{ Package: 'stx:libview2' }" "{ NameSpace: Smalltalk }" ImageReader subclass:#ST80FormReader instanceVariableNames:'' classVariableNames:'' poolDictionaries:'' category:'Graphics-Images-Readers' ! !ST80FormReader class methodsFor:'documentation'! copyright " COPYRIGHT (c) 1993 by Claus Gittinger All Rights Reserved This software is furnished under a license and may be used only in accordance with the terms of that license and with the inclusion of the above copyright notice. This software may not be provided or otherwise made available to, or used by, any other person. No title to or ownership of the software is hereby transferred. " ! documentation " this class provides methods for loading and saving st80-bitmap-file images. I am not sure, if this format is still supported/used by newer ST-80 versions; it used to be in 2.x versions (from what can be deduced by some bitmaps found in the manchester goodies). No writing is supported by this class. [See also:] Image Form Icon BlitImageReader FaceReader JPEGReader GIFReader PBMReader PCXReader SunRasterReader TargaReader TIFFReader WindowsIconReader XBMReader XPMReader XWDReader " ! ! !ST80FormReader class methodsFor:'initialization'! initialize "install myself in the Image classes fileFormat table for the `.form' extension." MIMETypes defineImageType:nil suffix:'form' reader:self. "Created: 1.2.1997 / 15:09:49 / cg" ! ! !ST80FormReader class methodsFor:'testing'! canRepresent:anImage "return true, if anImage can be represented in my file format. Only B&Wimages are supported." |photometric| anImage depth ~~ 1 ifTrue:[^ false]. (((photometric := anImage photometric) ~~ #blackIs0) and:[photometric ~~ #whiteIs0]) ifTrue:[^ false.]. ^ true ! isValidImageFile:aFileName "return true, if aFileName contains an st80-bitmap-file image" |code inStream ok w h| inStream := self streamReadingFile:aFileName. inStream isNil ifTrue:[^ false]. inStream binary. code := inStream nextUnsignedInt16MSB:true. ok := (code == 1). w := inStream nextUnsignedInt16MSB:true. h := inStream nextUnsignedInt16MSB:true. ((w == 0) or:[h == 0]) ifTrue:[ ok := false ]. inStream close. ^ ok "Modified: 21.4.1997 / 19:48:56 / cg" ! ! !ST80FormReader methodsFor:'reading'! fromStream:aStream "read an image in my format from aStream" |nBytes code offsetX offsetY| inStream := aStream. inStream binary. code := inStream nextUnsignedShortMSB:true. code isNil ifTrue:[ ^ nil ]. code ~~ 1 ifTrue:[ ^ self fileFormatError:'expected magic 1'. ]. width := aStream nextUnsignedShortMSB:true. height := aStream nextUnsignedShortMSB:true. ((width == 0) or:[height == 0]) ifTrue:[ ^ self fileFormatError:'zero width/height'. ]. offsetX := aStream nextUnsignedShortMSB:true. offsetY := aStream nextUnsignedShortMSB:true. self reportDimension. nBytes := width + 15 // 16 * 2 * height. data := ByteArray new:nBytes. aStream nextBytes:nBytes into:data. photometric := #whiteIs0. samplesPerPixel := 1. bitsPerSample := #(1) "ST80FormReader fromFile:''" "Modified: / 4.4.1998 / 18:24:40 / cg" ! ! !ST80FormReader methodsFor:'writing'! save:image onStream:aStream "save image as XBM file on aStream." (self class canRepresent:image) ifFalse:[ ^ Image cannotRepresentImageSignal raiseWith:image errorString:('ST80Form format only supports monochrome images'). ]. image mask notNil ifTrue:[ Image informationLostQuerySignal raiseWith:image errorString:('ST80Form format does not support an imageMask'). ]. outStream := aStream. width := image width. height := image height. photometric := image photometric. samplesPerPixel := image samplesPerPixel. bitsPerSample := image bitsPerSample. colorMap := image colorMap. outStream binary. outStream nextPutWord:1. outStream nextPutWord:width. outStream nextPutWord:height. outStream nextPutWord:0. outStream nextPutWord:0. outStream nextPutBytes:(data size) from:data. " ST80FormReader save:(Image fromFile:'bitmaps/SBrowser.xbm') onFile:'test.form' " "Modified: 27.2.1997 / 12:46:00 / cg" ! ! !ST80FormReader class methodsFor:'documentation'! version ^ '$Header$' ! ! ST80FormReader initialize!