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7188
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"{ Package: 'stx:libview' }"
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"{ NameSpace: Smalltalk }"
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FixedPalette subclass:#FixedPaletteWithAlpha
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instanceVariableNames:'alphaShift alphaMask'
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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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7199
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!FixedPaletteWithAlpha methodsFor:'accessing'!
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alphaShift:alphaShiftArg alphaMask:alphaMaskArg
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alphaShift := alphaShiftArg.
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alphaMask := alphaMaskArg.
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! !
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7188
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!FixedPaletteWithAlpha methodsFor:'printing & storing'!
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storeInstVarsOn:aStream
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super storeInstVarsOn:aStream.
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aStream nextPutAll:' alphaShift:'. alphaShift storeOn:aStream.
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aStream nextPutAll:' alphaMask:'. alphaMask storeOn:aStream.
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! !
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!FixedPaletteWithAlpha 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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|a aa|
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alphaMask == 0 ifTrue:[^ 0]. "/ no alpha component
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a := ((index-1 bitShift:alphaShift negated) bitAnd:alphaMask).
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aa := (a * 255.0 / (alphaMask)) rounded.
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^ aa
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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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bitsAlpha
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^ alphaMask highBit
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! !
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!FixedPaletteWithAlpha class methodsFor:'documentation'!
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version
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^ '$Header$'
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!
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version_CVS
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^ '$Header$'
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! !
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