COPYRIGHT (c) 1993 by Claus Gittinger

              All Rights Reserved

'!

!WindowsIconReader class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1993 by Claus Gittinger

 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.

"

!

version

"

$Header: /cvs/stx/stx/libview2/WindowsIconReader.st,v 1.6 1994-06-03 00:54:08 claus Exp $

"

!

documentation

"

    this class provides methods for loading Windows and OS2 icon files..

"

! !

fromOS2File: aFilename 

    inStream := self class streamReadingFile:aFilename.

    inStream isNil ifTrue:[^ nil].

    inStream binary.

    ^ self fromOS2Stream.

!

fromWindowsBMPFile: aFilename 

    inStream binary.

    ^ self fromWindowsBMPStream.

!

fromWindowsICOFile: aFilename 

    inStream := self class streamReadingFile:aFilename.

    inStream isNil ifTrue:[^ nil].

    ^ self fromWindowsICOStream.

    "

     Image fromFile:'/phys/clam2//LocalLibrary/Images/WIN_icons/ibm.ico'.

    "

!

fromWindowsICOStream

    | header inDepth

      rawMap rMap gMap bMap srcIndex dstIndex

      data4 mask tmp bytesPerRow nColor|

    header := ByteArray uninitializedNew:(6 + 16 + 40).

    inStream nextBytes:(6 + 16 + 40) into:header.

    width := header at:(6+1).

    height := header at:(7+1).

    nColor := header at:(8+1).

    "10, 11, 12, 13, 14 ? (reserve)"

    "15, 16, 17, 18       pixel array size"

    "19, 20, 21, 22       offset        "

    "23, ... , 62         ?"

    rawMap := ByteArray uninitializedNew:(16*4).

    inStream nextBytes:(16*4) into:rawMap.

        bMap at:i put:(rawMap at:srcIndex).

        rMap at:i put:(rawMap at:srcIndex).

        srcIndex := srcIndex + 1.

     WindowsIconReader new fromWindowsICOFile:'/phys/clam2//LocalLibrary/Images/WIN_icons/ibm.ico'.

fromWindowsBMPStream 

    | fileSize header inDepth inPlanes compression

      imgSize resH resV numColor numImportantColor

      dataStart

      data4 mask tmp bytesPerRow fourBytesPerColorInfo|

    fileSize := inStream size.

    "read the header"

    header := ByteArray uninitializedNew:16r54.

    inStream nextBytes:18 into:header.

    ((header at:(16r0E + 1)) == 40) ifTrue:[    "header-size"

        "

         its an Windows3.x BMP file

         or OS/2 vsn 2 BMP file

        "

        'BMP: Win3.x or OS/2 vsn 2 format' errorPrintNL.

        inStream nextBytes:(40-4) into:header startingAt:19.

        width := header wordAt:(16r12 + 1).  "(header at:19) + ((header at:20) * 256).   "

        height := header wordAt:(16r16 + 1). "(header at:23) + ((header at:24) * 256).   "

        inPlanes := header wordAt:(16r1A + 1).

        inDepth := header wordAt:(16r1C + 1).

        compression := header wordAt:(16r1E + 1).

        imgSize := header doubleWordAt:(16r22 + 1).

        resH := header doubleWordAt:(16r26 + 1).

        resV := header doubleWordAt:(16r2A + 1).

        numColor := header doubleWordAt:(16r2E + 1).

        numImportantColor := header doubleWordAt:(16r32 + 1).

        numColor == 0 ifTrue:[

            "

             some bmp-writers seem to leave this as zero (which is wrong)

            "

            numColor := 1 bitShift:inDepth.

            'BMP: missing nColor in header - assume ' errorPrint. numColor errorPrintNL

        ].

        rawMap := ByteArray uninitializedNew:(numColor * 4).

        inStream nextBytes:(numColor * 4) into:rawMap.

        fourBytesPerColorInfo := true.

        dataStart := header wordAt:(16r0A + 1)

    ] ifFalse:[

        ((header at:(16r0E + 1)) == 12) ifTrue:[     "core-info header size"

            "

             its an OS/2 (vsn1.2) BMP file

            "

           'BMP: OS/2 vsn 1.2 format' errorPrintNL.

            inStream nextBytes:(12-4) into:header startingAt:19.

            width := header wordAt:(16r12 + 1).  "(header at:19) + ((header at:20) * 256).   "

            height := header wordAt:(16r14 + 1). "(header at:21) + ((header at:22) * 256).   "

            inPlanes := header wordAt:(16r16 + 1).

            inDepth := header wordAt:(16r18 + 1).

            numColor := 1 bitShift:inDepth.

            rawMap := ByteArray uninitializedNew:(numColor * 3).

            inStream nextBytes:(numColor * 3) into:rawMap.

            fourBytesPerColorInfo := false.

            compression := 0.

            dataStart := header wordAt:(16r0A + 1)

        ] ifFalse:[

            'BMP: unknown format' errorPrintNL.

            inStream close.

            ^ nil

        ].

    ].

    "read the colormap"

    rMap := Array new:numColor.

    gMap := Array new:numColor.

    bMap := Array new:numColor.

    srcIndex := 1.

    1 to:numColor do:[:i |

        bMap at:i put:(rawMap at:srcIndex).

        srcIndex := srcIndex + 1.

        gMap at:i put:(rawMap at:srcIndex).

        srcIndex := srcIndex + 1.

        rMap at:i put:(rawMap at:srcIndex).

        srcIndex := srcIndex + 1.

        fourBytesPerColorInfo ifTrue:[

            srcIndex := srcIndex + 1.

        ]

    ].

    "

     currently only normal (non-rle) bitmaps

     supported

    "

    compression ~~ 0 ifTrue:[

        'BMP compression type ' errorPrint. compression errorPrint.

        'not supported' errorPrintNL.

        inStream close.

        ^ nil

    ].

    inPlanes ~~ 1 ifTrue:[

        'BMP only 1 plane images supported' errorPrintNL.

        inStream close.

        ^ nil

    ].

    "read the data bits"

    bytesPerRow := width * inDepth + 7 // 8.

    data4 := ByteArray uninitializedNew:(height * bytesPerRow).

    inStream position:(dataStart + 1).

    inStream nextBytes:(height * bytesPerRow) into:data4.

    "read mask"

"

    mask := ByteArray new:(width * height / 8).

    inStream nextBytes:(width * height / 8) into:mask.

"

    "stupid: last row first"

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

    srcIndex := 1.

    dstIndex := (height - 1) * bytesPerRow + 1.

    1 to:height do:[:row |

        tmp replaceFrom:dstIndex to:(dstIndex + bytesPerRow - 1)

                   with:data4 startingAt:srcIndex.

        srcIndex := srcIndex + bytesPerRow.

        dstIndex := dstIndex - bytesPerRow.

    ].

    data4 := tmp.

    "expand into bytes"

    data := ByteArray new:(width * height).

    data4 expandPixels:inDepth width:width height:height

                  into:data mapping:nil.

    photometric := #palette.

    samplesPerPixel := 1.

    bitsPerSample := #(8).

    colorMap := Array with:rMap with:gMap with:bMap.

    inStream close.

!

fromFile: aFilename 

    | fileSize header |

    fileSize < 16 ifTrue:[

        inStream close.

        self error:'WINREADER: short file'.

        ^ nil

    ].

    header := ByteArray uninitializedNew:4.

    inStream nextBytes:4 into:header.

    (header startsWith:#(66 77)) ifTrue:[     "BM"

        inStream position:1.

        'WINREADER: Win3.x or OS/2 vsn 2 BM format' errorPrintNL.

        ^ self fromWindowsBMPStream

    ].

    (header startsWith:#(66 65)) ifTrue:[     "BA"

        inStream position:1.

        'WINREADER: OS/2 vsn 2 BA format' errorPrintNL.

        ^ self fromOS2Stream

    ].

    (header startsWith:#(73 67)) ifTrue:[     "IC"

        inStream position:1.

        'WINREADER: OS/2 IC format' errorPrintNL.

        ^ self fromOS2Stream

    ].

    (header startsWith:#(80 84)) ifTrue:[     "PT"

        inStream position:1.

        'WINREADER: OS/2 PT format' errorPrintNL.

        ^ self fromOS2Stream

    ].

    (header startsWith:#(0 0 1 0)) ifTrue:[

        inStream position:1.

        'WINREADER: Win3.x ICO format' errorPrintNL.

        ^ self fromWindowsICOStream

    ].

    self error:'WINREADER: format not supported'.

    inStream close.

    ^ nil

    "

     Image fromFile:'/phys/clam//LocalLibrary/Images/OS2_icons/dos.ico'

    "

!

fromOS2Stream 

    | header inDepth

      rawMap rMap gMap bMap srcIndex dstIndex

      data4 mask tmp bytesPerRow nColors nByte|

    inStream binary.