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"
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COPYRIGHT (c) 1997 by eXept Software AG / 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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"{ Package: 'stx:libview' }"
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"{ NameSpace: Smalltalk }"
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ColorPalette subclass:#FixedPalette
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instanceVariableNames:'redShift redMask greenShift greenMask blueShift blueMask'
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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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!FixedPalette class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1997 by eXept Software AG / 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 will (sooner or later) take over and/or redefine some of the Colormap functionality.
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This migration will be done both to cleanup the code and for VW compatibility.
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Notice: For now, the whole functionality is still in Colormap
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[see also:]
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Color Image Form
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"
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! !
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!FixedPalette class methodsFor:'instance creation'!
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redShift:reds redMask:redm greenShift:grns greenMask:grnm blueShift:blus blueMask:blum
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^ self new
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redShift:reds redMask:redm
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greenShift:grns greenMask:grnm
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blueShift:blus blueMask:blum
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"Created: 20.6.1997 / 16:15:15 / cg"
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! !
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!FixedPalette methodsFor:'initialization'!
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redShift:rs redMask:rm greenShift:gs greenMask:gm blueShift:bs blueMask:bm
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redShift := rs.
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redMask := rm.
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greenShift := gs.
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greenMask := gm.
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blueShift := bs.
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blueMask := bm
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"Created: 20.6.1997 / 16:16:49 / cg"
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! !
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!FixedPalette methodsFor:'printing & storing'!
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displayString
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^ self storeString
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!
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printOn:aStream
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self storeOn:aStream
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!
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storeInstVarsOn:aStream
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aStream nextPutAll:' redShift:'. redShift storeOn:aStream.
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aStream nextPutAll:' redMask:'. redMask storeOn:aStream.
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aStream nextPutAll:' greenShift:'. greenShift storeOn:aStream.
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aStream nextPutAll:' greenMask:'. greenMask storeOn:aStream.
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aStream nextPutAll:' blueShift:'. blueShift storeOn:aStream.
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aStream nextPutAll:' blueMask:'. blueMask storeOn:aStream.
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!
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storeOn:aStream
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aStream nextPutAll:'(' , self class name.
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self storeInstVarsOn:aStream.
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aStream nextPutAll:')'.
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! !
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!FixedPalette methodsFor:'queries'!
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alphaByteAt:index
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"return the (simulated) alphaByte at index.
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Notice that index is 1.."
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^ 0
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bitsAlpha
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^ 0
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bitsBlue
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^ blueMask highBit
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bitsGreen
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^ greenMask highBit
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!
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bitsRed
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^ redMask highBit
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!
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blueByteAt:index
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"return the (simulated) blueByte at index.
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Notice that index is 1.."
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|b bb|
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blueMask == 0 ifTrue:[^ 0]. "/ no blue component
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b := ((index-1 bitShift:blueShift negated) bitAnd:blueMask).
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bb := (b * 255.0 / (blueMask)) rounded.
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^ bb
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"
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(FixedPalette redShift:16 redMask:16rFF greenShift:8 greenMask:16rFF blueShift:0 blueMask:16rFF) blueByteAt:16rFFFFFF+1
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(FixedPalette redShift:10 redMask:16r1F greenShift:5 greenMask:16r1F blueShift:0 blueMask:16r1F) blueByteAt:16r7FFF+1
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(FixedPalette redShift:11 redMask:16r1F greenShift:5 greenMask:16r3F blueShift:0 blueMask:16r1F) blueByteAt:16rFFFF+1
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(FixedPalette redShift:11 redMask:16r1F greenShift:5 greenMask:16r3F blueShift:0 blueMask:16r1F) blueByteAt:0+1
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(FixedPalette redShift:11 redMask:16r1F greenShift:5 greenMask:16r3F blueShift:0 blueMask:16r1F) blueByteAt:16r7FFF+1
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"
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!
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greenByteAt:index
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"return the (simulated) greenByte at index.
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Notice that index is 1.."
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|g gb|
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greenMask == 0 ifTrue:[^ 0]. "/ no green component
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g := ((index-1 bitShift:greenShift negated) bitAnd:greenMask).
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gb := (g * 255.0 / (greenMask)) rounded.
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^ gb
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"
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(FixedPalette redShift:16 redMask:16rFF greenShift:8 greenMask:16rFF blueShift:0 blueMask:16rFF) greenByteAt:16rFFFFFF+1
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(FixedPalette redShift:10 redMask:16r1F greenShift:5 greenMask:16r1F blueShift:0 blueMask:16r1F) greenByteAt:16r7FFF+1
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(FixedPalette redShift:11 redMask:16r1F greenShift:5 greenMask:16r3F blueShift:0 blueMask:16r1F) greenByteAt:16rFFFF+1
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(FixedPalette redShift:11 redMask:16r1F greenShift:5 greenMask:16r3F blueShift:0 blueMask:16r1F) greenByteAt:0+1
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(FixedPalette redShift:11 redMask:16r1F greenShift:5 greenMask:16r3F blueShift:0 blueMask:16r1F) greenByteAt:16r7FFF+1
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"
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!
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isFixedPalette
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^ true
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!
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redByteAt:index
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"return the (simulated) redByte at index.
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Notice that index is 1.."
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|r rb|
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redMask == 0 ifTrue:[^ 0]. "/ no red component
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r := ((index-1 bitShift:redShift negated) bitAnd:redMask).
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rb := (r * 255.0 / (redMask)) rounded.
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^ rb
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"
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(FixedPalette redShift:16 redMask:16rFF greenShift:8 greenMask:16rFF blueShift:0 blueMask:16rFF) redByteAt:16rFFFFFF+1
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(FixedPalette redShift:10 redMask:16r1F greenShift:5 greenMask:16r1F blueShift:0 blueMask:16r1F) redByteAt:16r7FFF+1
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(FixedPalette redShift:11 redMask:16r1F greenShift:5 greenMask:16r3F blueShift:0 blueMask:16r1F) redByteAt:16rFFFF+1
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(FixedPalette redShift:11 redMask:16r1F greenShift:5 greenMask:16r3F blueShift:0 blueMask:16r1F) redByteAt:0+1
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(FixedPalette redShift:11 redMask:16r1F greenShift:5 greenMask:16r3F blueShift:0 blueMask:16r1F) redByteAt:16r7FFF+1
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"
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!
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size
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"return the number of (simulated) colors in this colormap"
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^ ((redMask bitShift:redShift)
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+ (greenMask bitShift:greenShift)
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+ (blueMask bitShift:blueShift)) + 1
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"
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(FixedPalette redShift:16 redMask:16rFF greenShift:8 greenMask:16rFF blueShift:0 blueMask:16rFF) size
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(FixedPalette redShift:10 redMask:16r1F greenShift:5 greenMask:16r1F blueShift:0 blueMask:16r1F) size
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(FixedPalette redShift:11 redMask:16r1F greenShift:5 greenMask:16r3F blueShift:0 blueMask:16r1F) size
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"
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! !
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!FixedPalette class methodsFor:'documentation'!
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version
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^ '$Header$'
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! !
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