"{ Encoding: utf8 }"

"

 COPYRIGHT (c) 1995 by Claus Gittinger

	      All Rights Reserved

 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.

"

"{ Package: 'stx:libview' }"

"{ NameSpace: Smalltalk }"

Image subclass:#Depth16Image

	instanceVariableNames:''

	classVariableNames:''

	poolDictionaries:''

	category:'Graphics-Images'

!

!Depth16Image class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1995 by Claus Gittinger

	      All Rights Reserved

 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.

"

!

documentation

"

    this class represents 16 bit images.

    Only the minimum protocol is implemented here; much more is

    needed for higher performance operations on depth16 images.

    (however, 16bit images are seldom used, so falling back into the

    slow general methods from Image should not hurt too much ..)

    [author:]

	Claus Gittinger

    [see also:]

	Depth1Image Depth2Image Depth4Image Depth8Image Depth24Image

	ImageReader

"

! !

!Depth16Image class methodsFor:'queries'!

defaultPhotometric

    "return the default photometric pixel interpretation"

    ^ #rgb

    "Created: / 27-05-2007 / 14:04:11 / cg"

!

imageDepth

    "return the depth of images represented by instances of

     this class - here we return 16"

    ^ 16

    "Modified: 20.4.1996 / 23:40:01 / cg"

! !

!Depth16Image methodsFor:'accessing-pixels'!

pixelAtX:x y:y

    "retrieve a pixel at x/y; return a pixelValue (0..16rFFFF).

     The interpretation of the returned value depends on the photometric

     and the colormap. See also Image>>atX:y:)

     Pixels start at x=0 , y=0 for upper left pixel, end at

     x = width-1, y=height-1 for lower right pixel"

    |lineIndex "{ Class: SmallInteger }"|

    pixelFunction notNil ifTrue:[^ pixelFunction value:x value:y].

    lineIndex := (width * 2 * y) + 1.

    ^ bytes unsignedInt16At:(lineIndex + (x * 2)) MSB:true.

    "Created: 24.4.1997 / 16:06:19 / cg"

!

pixelAtX:x y:y put:aPixelValue

    "set the pixel at x/y to aPixelValue (0..16rFFFF).

     The interpretation of the pixelValue depends on the photometric

     and the colormap. (see also: Image>>atX:y:put:)

     Pixels start at x=0 , y=0 for upper left pixel, end at

     x = width-1, y=height-1 for lower right pixel"

    |lineIndex "{ Class: SmallInteger }"|

    bytes isNil ifTrue:[ self createPixelStore ].

    lineIndex := (width * 2 * y) + 1.

    bytes unsignedInt16At:(lineIndex + (x * 2)) put:aPixelValue MSB:true

    "Created: 24.4.1997 / 17:06:21 / cg"

!

rowAt:y putAll:pixelArray startingAt:startIndex

    "store a single rows bits from bits in the pixelArray argument;

     The interpretation of the pixel values depends on the photometric.

     Notice: row coordinate starts at 0."

    |dstIdx "{ Class: SmallInteger }"

     srcIdx "{ Class: SmallInteger }"

     pixel

     bytes|

    bytes := self bits.

    dstIdx := (width * 2 * y) + 1.

    srcIdx := startIndex.

    1 to:width do:[:col |

        pixel := pixelArray at:srcIdx.

        "/ msbFirst

        "/ bytes unsignedInt16At:dstIdx put:pixel MSB:true.

        bytes at:dstIdx put:((pixel bitShift:-8) bitAnd:16rFF).

        bytes at:dstIdx+1 put:(pixel bitAnd:16rFF).

        dstIdx := dstIdx + 2.

        srcIdx := srcIdx + 1.

    ].

    "Created: 24.4.1997 / 15:50:27 / cg"

! !

!Depth16Image methodsFor:'initialization'!

initialize

    super initialize.

    samplesPerPixel := 3.

    bitsPerSample := #[5 5 5].

    "Created: / 27-05-2007 / 14:09:46 / cg"

    "Modified: / 30-01-2017 / 18:24:16 / stefan"

! !

!Depth16Image methodsFor:'magnification'!

magnifyRowFrom:srcBytes offset:srcStart

	  into:dstBytes offset:dstStart factor:mX

    "magnify a single pixel row - can only magnify by integer factors"

%{

    unsigned char *srcP, *dstP;

    int _mag;

    REGISTER int i;

    REGISTER unsigned char byte1, byte2;

    int _pixels;

    OBJ w = __INST(width);

    if (__bothSmallInteger(srcStart, dstStart)

     && __bothSmallInteger(w, mX)

     && __isByteArrayLike(srcBytes) && __isByteArray(dstBytes)) {

	_mag = __intVal(mX);

	srcP = __ByteArrayInstPtr(srcBytes)->ba_element - 1 + __intVal(srcStart);

	dstP = __ByteArrayInstPtr(dstBytes)->ba_element - 1 + __intVal(dstStart);

	_pixels = __intVal(w);

	while (_pixels--) {

	    byte1 = *srcP;

	    byte2 = *(srcP+1);

	    srcP += 2;

	    for (i=_mag; i>0; i--) {

		*dstP = byte1;

		*(dstP+1) = byte2;

		dstP += 2;

	    }

	}

	RETURN (self);

    }

%}.

    super

	magnifyRowFrom:srcBytes offset:srcStart

	into:dstBytes offset:dstStart factor:mX

! !

!Depth16Image methodsFor:'queries'!

bitsPerPixel

    "return the number of bits per pixel"

    ^ 16

!

bitsPerRow

    "return the number of bits in one scanline of the image"

    ^ width * 16

!

bytesPerRow

    "return the number of bytes in one scanline of the image"

    ^ width * 2.

!

valueFromRGB:rgb

    "given a color as rgb-value, with 8 bits per component and r in high 8 bits, 

     return the corresponding pixel value.

     The red component is in the high 8 bits.

     Non-representable colors return nil."

    |pixel redBits greenBits blueBits r g b a|

    b := rgb bitAnd:16rFF.

    g := (rgb bitShift:-8) bitAnd:16rFF.

    r := (rgb bitShift:-16) bitAnd:16rFF.

    a := 255.

    photometric == #rgb ifTrue:[

        samplesPerPixel >= 3 ifTrue:[

            "/ rrrrrrrrggggggggbbbbbbbb -> rrrrrgggggbbbbb

            "/ r,g,b  r in hi bits, b in low bits 

            redBits := bitsPerSample at:1.

            greenBits := bitsPerSample at:2.

            blueBits := bitsPerSample at:3.

            r := r bitShift:(redBits-8).

            g := g bitShift:(greenBits-8).

            b := b bitShift:(blueBits-8).

            pixel := (((r bitShift:greenBits) + g) bitShift:blueBits) + b.

            ^ pixel

        ]

    ].

    ^ super valueFromRGB:rgb

    "Created: / 12-07-2019 / 14:48:31 / Stefan Reise"

! !

!Depth16Image class methodsFor:'documentation'!

version

    ^ '$Header$'

!

version_CVS

    ^ '$Header$'

! !