"

 COPYRIGHT (c) 1992 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.

"

ImageReader subclass:#XBMReader

!

XBMReader comment:'

COPYRIGHT (c) 1992 by Claus Gittinger

'!

!XBMReader class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1992 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

"

"

!

documentation

"

    this class provides methods for loading and saving x-bitmap-file images.

    These images can (for example) be created using the bitmap editor supplied

    with X. 

    Only monochrome images can be represented in this format.

    See also: XPMRreader, SunReader, WinIconReader, GIFReader and TIFFReader

"

! !

!XBMReader methodsFor:'writing to file'!

save:image onFile:aFileName

    "save image as XBM file on aFileName"

    |reverseBits bits srcIndex rowBytes|

    outStream := FileStream newFileNamed:aFileName.

    outStream isNil ifTrue:[

    ].

    width := image width.

    height := image height.

    photometric := image photometric.

    samplesPerPixel := image samplesPerPixel.

    bitsPerSample := image bitsPerSample.

    colorMap := image colorMap.

    ((samplesPerPixel ~~ 1)

    or:[((bitsPerSample at:1) ~~ 1)

    or:[(photometric ~~ #blackIs0) and:[photometric ~~ #whiteIs0]]]) ifTrue:[

    ].

    outStream nextPutAll: '#define xbm_width '.

    outStream nextPutAll:(width printString).

    outStream cr.

    outStream nextPutAll: '#define xbm_height '.

    outStream nextPutAll:(height printString).

    outStream cr.

    outStream nextPutAll: 'static char xbm_bits[] = {'; cr.

    reverseBits := self class reverseBits.

    rowBytes := width + 7 // 8.

    data := image bits.

    srcIndex := 1.

    height timesRepeat:[

    ].

    outStream nextPutAll: '};'; cr.

    outStream close

    "XBMReader save:(Image fromFile:'bitmaps/SBrowser.xbm') onFile:'test.xbm'"

! !

!XBMReader class methodsFor:'testing'!

isValidImageFile:aFileName

    "return true, if aFileName contains an x-bitmap-file image"

    |line inStream index1 index2 keyword|

    inStream := self streamReadingFile:aFileName.

    inStream isNil ifTrue:[^ false].

    line := inStream nextLine.

    line isNil ifTrue:[

    ].

    [line startsWith:'#'] whileFalse:[

    ].

    index1 := line indexOf:(Character space).

    index2 := line indexOf:(Character space) startingAt:(index1 + 1).

    (index2 == 0) ifTrue:[

    ].

    keyword := line copyFrom:index1 to:(index2 - 1).

    (keyword endsWith:'_width') ifFalse:[

    ].

    inStream close.

    ^ true

! !

!XBMReader methodsFor:'reading from file'!

fromFile:aFileName

    |line 

     index    "{ Class: SmallInteger }"

     dstIndex "{ Class: SmallInteger }"

     bytesPerRow

     lo       "{ Class: SmallInteger }"

     hi       "{ Class: SmallInteger }"

     val      "{ Class: SmallInteger }"

     reverseBits|

    inStream := self class streamReadingFile:aFileName.

    inStream isNil ifTrue:[^ nil].

    line := inStream nextLine.

    line isNil ifTrue:[

    ].

    [line startsWith:'#'] whileFalse:[

    ].

    (line startsWith:'#define') ifFalse:[

    ].

    index := line indexOf:(Character space).

    index := line indexOf:(Character space) startingAt:(index + 1).

    (index == 0) ifTrue:[

    ].

    ((line copyTo:index - 1) endsWith:'width') ifFalse:[

    ].

    line := line copyFrom:(index + 1).

    width := Number readFromString:line.

    line := inStream nextLine.

    index := line indexOf:(Character space).

    index := line indexOf:(Character space) startingAt:(index + 1).

    (index == 0) ifTrue:[

    ].

    ((line copyTo:index - 1) endsWith:'height') ifFalse:[

    ].

    line := line copyFrom:(index + 1).

    height := Number readFromString:line.

    bytesPerRow := width // 8.

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

    ].

    reverseBits := self class reverseBits.

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

    dstIndex := 1.

    line := inStream nextLine.

    [line startsWith:'#'] whileTrue:[

    ].

    line := inStream nextLine.

    [line notNil] whileTrue:[

    ].

    photometric := #whiteIs0.

    samplesPerPixel := 1.

    bitsPerSample := #(1).

    "XBMReader fromFile:'bitmaps/globe1.xbm'" 

! !