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"
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COPYRIGHT (c) 2009 by eXept Software AG
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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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Image subclass:#Depth64Image
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instanceVariableNames:''
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classVariableNames:''
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poolDictionaries:''
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category:'Graphics-Images'
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!
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!Depth64Image class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 2009 by eXept Software AG
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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 represents 64 bit images as possibly provided by png 4x16bit rgba images.
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Such images are normally not used in real world applications, as humans cannot differentiate
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more than roughly 200 distinct color tone values. However, in image processing (false-color) applications,
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such a fine grain image makes sense and is sometimes used.
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[author:]
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Claus Gittinger
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[see also:]
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Depth1Image Depth2Image Depth4Image Depth8Image Depth16Image Depth24Image Depth32Image
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ImageReader
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"
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! !
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!Depth64Image class methodsFor:'queries'!
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defaultPhotometric
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"return the default photometric pixel interpretation"
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^ #rgba
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!
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imageDepth
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"return the depth of images represented by instances of
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this class - here we return 64"
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^ 64
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! !
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!Depth64Image methodsFor:'accessing-pixels'!
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pixelAtX:x y:y
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"retrieve a pixel at x/y; return a pixelValue.
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Pixels start at x=0 , y=0 for upper left pixel, end at
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x = width-1, y=height-1 for lower right pixel"
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|pixelIndex "{ Class: SmallInteger }"|
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pixelIndex := (width * 8 * y) + 1 + (x * 8).
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^ ((bytes wordAt:pixelIndex MSB:true) bitShift:48)
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+ ((bytes wordAt:pixelIndex+2 MSB:true) bitShift:32)
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+ ((bytes wordAt:pixelIndex+4 MSB:true) bitShift:16)
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+ (bytes wordAt:pixelIndex+6 MSB:true).
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!
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pixelAtX:x y:y put:aPixelValue
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"set the pixel at x/y to aPixelValue.
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Pixels start at x=0 , y=0 for upper left pixel, end at
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x = width-1, y=height-1 for lower right pixel"
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|pixelIndex "{ Class: SmallInteger }"|
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pixelIndex := (width * 8 * y) + 1 + (x * 8).
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bytes isNil ifTrue:[
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self createPixelStore
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].
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bytes wordAt:pixelIndex put:((aPixelValue bitShift:-48) bitAnd:16rFFFF) MSB:true.
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bytes wordAt:pixelIndex+2 put:((aPixelValue bitShift:-32) bitAnd:16rFFFF) MSB:true.
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bytes wordAt:pixelIndex+4 put:((aPixelValue bitShift:-16) bitAnd:16rFFFF) MSB:true.
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bytes wordAt:pixelIndex+6 put:(aPixelValue bitAnd:16rFFFF) MSB:true.
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! !
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!Depth64Image methodsFor:'initialization'!
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initialize
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super initialize.
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samplesPerPixel := 4.
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bitsPerSample := #(16 16 16 16).
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! !
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!Depth64Image methodsFor:'queries'!
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bitsPerPixel
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"return the number of bits per pixel"
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^ 64
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!
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bitsPerRow
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"return the number of bits in one scanline of the image"
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^ width * 64
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!
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bytesPerRow
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"return the number of bytes in one scanline of the image"
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^ width * 8.
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! !
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!Depth64Image class methodsFor:'documentation'!
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version
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^ '$Header: /cvs/stx/stx/libview/Depth64Image.st,v 1.1 2009-08-03 10:11:24 cg Exp $'
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! !
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