"

 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.

"

ImageReader subclass:#FaceReader

         instanceVariableNames:''

         classVariableNames:''

         poolDictionaries:''

         category:'Graphics-Support'

!

FaceReader comment:'

COPYRIGHT (c) 1993 by Claus Gittinger

              All Rights Reserved

this class knows how to read face files.

$Header: /cvs/stx/stx/libview2/FaceReader.st,v 1.5 1994-01-08 17:12:56 claus Exp $

written spring 93 by claus

'!

!FaceReader methodsFor:'reading from file'!

fromFile:aFileName

    |line 

     dstIndex "{ Class: SmallInteger }"

     bytesPerRow

     lo       "{ Class: SmallInteger }"

     hi       "{ Class: SmallInteger }"

     val      "{ Class: SmallInteger }"

     inHeader s depth|

    inStream := self class streamReadingFile:aFileName.

    inStream isNil ifTrue:[^ nil].

    line := inStream nextLine.

    line isNil ifTrue:[

        inStream close.

        ^ nil

    ].

    inHeader := true.

    [inHeader] whileTrue:[

        (line startsWith:'Image:') ifTrue:[

            s := ReadStream on:line.

            s position:7.

            width := Number readFrom:s.

            height := Number readFrom:s.

            depth := Number readFrom:s.

            inHeader := false.

        ].

        line := inStream nextLine

    ].

    depth == 8 ifFalse:[

        self error:'only depth 8 supported'

    ].

    [line isEmpty] whileTrue:[

        line := inStream nextLine.

    ].

    bytesPerRow := width * depth // 8.

    ((width * depth \\ 8) ~~ 0) ifTrue:[

        bytesPerRow := bytesPerRow + 1

    ].

    data := ByteArray uninitializedNew:(bytesPerRow * height).

    dstIndex := data size.

    [line notNil] whileTrue:[

        1 to:(line size) by:2 do:[:cI |

            hi := (line at:cI) digitValue.

            lo := (line at:(cI + 1)) digitValue.

            val := (hi bitShift:4) bitOr:lo.

            data at:dstIndex put:val.

            dstIndex := dstIndex - 1

        ].

        line := inStream nextLine

    ].

    photometric := #whiteIs0.

    samplesPerPixel := 1.

    bitsPerSample := #(8)

    "FaceReader fromFile:'../goodies/faces/next.com/steve.face'"

    "this is NOT steve jobs :-)"

! !