"{ 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:#Depth32Image
	instanceVariableNames:''
	classVariableNames:''
	poolDictionaries:''
	category:'Graphics-Images'
!

!Depth32Image 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 32 bit images.
    Only the minimum protocol is implemented here; much more is
    needed for higher performance operations on depth32 images.
    (however, 32bit images are very 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 Depth16Image Depth24Image
	ImageReader
"
! !

!Depth32Image class methodsFor:'queries'!

defaultPhotometric
    "return the default photometric pixel interpretation"

    ^ #rgb

    "Created: / 27-05-2007 / 14:03:59 / cg"
    "Modified: / 06-06-2007 / 11:12:13 / cg"
!

imageDepth
    "return the depth of images represented by instances of
     this class - here we return 32"

    ^ 32

    "Modified: 20.4.1996 / 23:40:01 / cg"
    "Created: 24.4.1997 / 19:00:28 / cg"
! !

!Depth32Image methodsFor:'accessing-pixels'!

colorAtX:x y:y
    "retrieve a pixel at x/y; return a color.
     Pixels start at x=0 , y=0 for upper left pixel, end at
     x = width-1, y=height-1 for lower right pixel"

    |index "{ Class: SmallInteger }"
     rVal gVal bVal|

    photometric ~~ #rgb ifTrue:[^ super colorAtX:x y:y].

    index := 1 + (((width * y) + x) * 4).
    rVal := bytes at:(index).
    gVal := bytes at:(index + 1).
    bVal := bytes at:(index + 2).

    ^ Color redByte:rVal greenByte:gVal blueByte:bVal
!

colorAtX:x y:y put:aColor
    "set the pixel at x/y to aColor.
     Pixels start at x=0 , y=0 for upper left pixel, end at
     x = width-1, y=height-1 for lower right pixel."

    |index "{ Class: SmallInteger }"|

    photometric ~~ #rgb ifTrue:[^ super colorAtX:x y:y put:aColor].

    index := 1 + (((width * y) + x) * 4).
    bytes at:(index) put:(aColor redByte).
    bytes at:(index + 1) put:(aColor greenByte).
    bytes at:(index + 2) put:(aColor blueByte).
    bytes at:(index + 3) put:255.               "alpha channel"
!

pixelAtX:x y:y
    "retrieve a pixel at x/y; return a pixelValue.
     Pixels start at x=0 , y=0 for upper left pixel, end at
     x = width-1, y=height-1 for lower right pixel"

    |pixelIndex "{ Class: SmallInteger }"|

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

    pixelIndex := 1 + (((width * y) + x) * 4).

    "left pixel in high bits"
    ^ bytes doubleWordAt:pixelIndex MSB:true.

    "Created: 24.4.1997 / 19:00:28 / cg"
    "Modified: 24.4.1997 / 23:11:05 / cg"
!

pixelAtX:x y:y put:aPixelValue
    "set the pixel at x/y to aPixelValue.
     Pixels start at x=0 , y=0 for upper left pixel, end at
     x = width-1, y=height-1 for lower right pixel"

    |pixelIndex "{ Class: SmallInteger }"|

    pixelIndex := 1 + (((width * y) + x) * 4).
    bytes isNil ifTrue:[
        self createPixelStore
    ].
    bytes doubleWordAt:pixelIndex put:aPixelValue MSB:true

    "Created: / 24-04-1997 / 19:00:28 / cg"
    "Modified: / 06-06-2007 / 12:20:57 / cg"
!

rowAt:y putAll:pixelArray startingAt:startIndex
    "store a single rows bits from bits in the pixelArray argument;
     Return the pixelArray.
     Notice: row coordinate starts at 0."

    |bytes dstIdx pixel|

    bytes := self bits.
    dstIdx := (y * self bytesPerRow) + 1.
    0 to:width-1 do:[:col |
        pixel := pixelArray at:(startIndex + col).
        bytes at:dstIdx put:((pixel bitShift:-24) bitAnd:16rFF).
        bytes at:dstIdx+1 put:((pixel bitShift:-16) bitAnd:16rFF).
        bytes at:dstIdx+2 put:((pixel bitShift:-8) bitAnd:16rFF).
        bytes at:dstIdx+3 put:(pixel bitAnd:16rFF).
        dstIdx := dstIdx + 4.
    ].
    ^ pixelArray
! !

!Depth32Image methodsFor:'converting rgb images'!

rgbImageAsTrueColorFormOn:aDevice
    "return a truecolor form from the rgb-picture."

    |bytes bestFormat usedDeviceDepth usedDeviceBitsPerPixel usedDevicePadding
     myDepth form imageBits padd
     rightShiftR rightShiftG rightShiftB shiftRed shiftGreen shiftBlue|

    bytes := self bits.

    bestFormat := self bestSupportedImageFormatFor:aDevice.

    usedDeviceDepth := bestFormat at:#depth.
    usedDeviceBitsPerPixel := bestFormat at:#bitsPerPixel.
    usedDevicePadding := bestFormat at:#padding.

    rightShiftR := (8 - aDevice bitsRed).
    rightShiftG := (8 - aDevice bitsGreen).
    rightShiftB := (8 - aDevice bitsBlue).

    shiftRed := aDevice shiftRed.
    shiftGreen := aDevice shiftGreen.
    shiftBlue := aDevice shiftBlue.

    "/
    "/ for now, only a few formats are supported
    "/
    myDepth := self bitsPerPixel.
    usedDeviceBitsPerPixel == 24 ifTrue:[
	"/
	"/ 24 bit/pixel
	"/
	imageBits := ByteArray uninitializedNew:(width * height * 3).
	usedDevicePadding := 8.

	"/ now, walk over the image and compose 24bit values from the r/g/b/a triples
%{
	unsigned char *srcPtr = 0;
	unsigned char *dstPtr = 0;

	if (__isByteArrayLike(bytes)) {
	    srcPtr = __ByteArrayInstPtr(bytes)->ba_element;
	} else {
	    if (__isExternalBytesLike(bytes)) {
		srcPtr = __externalBytesAddress(bytes);
	    }
	}
	if (__isByteArray(imageBits)) {
	    dstPtr = __ByteArrayInstPtr(imageBits)->ba_element;
	} else {
	    if (__isExternalBytesLike(imageBits)) {
		dstPtr = __externalBytesAddress(imageBits);
	    }
	}

	if (__bothSmallInteger(__INST(height), __INST(width))
	 && __bothSmallInteger(rightShiftR, shiftRed)
	 && __bothSmallInteger(rightShiftG, shiftGreen)
	 && __bothSmallInteger(rightShiftB, shiftBlue)
	 && srcPtr
	 && dstPtr) {
	    int rShRed = __intVal(rightShiftR),
		rShGreen = __intVal(rightShiftG),
		rShBlue = __intVal(rightShiftB),
		lShRed = __intVal(shiftRed),
		lShGreen = __intVal(shiftGreen),
		lShBlue = __intVal(shiftBlue);
	    int x, y, w;

	    w = __intVal(__INST(width));
	    if ((rShRed == 0) && (rShGreen == 0) && (rShBlue == 0)) {
		if ((lShRed == 0) && (lShGreen == 8) && (lShBlue == 16)) {
		    for (y=__intVal(__INST(height)); y > 0; y--) {
			for (x=w; x > 0; x--) {
			    unsigned v;

			    v = srcPtr[0] << 0;
			    v |= (srcPtr[1] << 8);
			    v |= (srcPtr[2] << 16);
# ifdef __MSBFIRST
			    dstPtr[0] = srcPtr[0];
			    dstPtr[1] = srcPtr[1];
			    dstPtr[2] = srcPtr[2];
# else /* not MSB */
			    dstPtr[0] = srcPtr[2];
			    dstPtr[1] = srcPtr[1];
			    dstPtr[2] = srcPtr[0];
# endif /* not MSB */
			    dstPtr += 3;
			    srcPtr += 4;
			}
		    }
		} else {
		    for (y=__intVal(__INST(height)); y > 0; y--) {
			for (x=w; x > 0; x--) {
			    unsigned v;

			    v = srcPtr[0] << lShRed;
			    v |= (srcPtr[1] << lShGreen);
			    v |= (srcPtr[2] << lShBlue);
# ifdef __MSBFIRST
			    dstPtr[0] = (v) & 0xFF;
			    dstPtr[1] = (v>>8) & 0xFF;
			    dstPtr[2] = (v>>16) & 0xFF;
# else /* not MSB */
			    dstPtr[0] = (v>>16) & 0xFF;
			    dstPtr[1] = (v>>8) & 0xFF;
			    dstPtr[2] = (v) & 0xFF;
# endif /* not MSB */
			    dstPtr += 3;
			    srcPtr += 4;
			}
		    }
		}
	    } else {
		for (y=__intVal(__INST(height)); y > 0; y--) {
		    for (x=w; x > 0; x--) {
			unsigned r, g, b, v;

			r = srcPtr[0] >> rShRed;
			g = srcPtr[1] >> rShGreen;
			b = srcPtr[2] >> rShBlue;
			v = r << lShRed;
			v |= (g << lShGreen);
			v |= (b << lShBlue);
# ifdef __MSBFIRST
			dstPtr[0] = (v) & 0xFF;
			dstPtr[1] = (v>>8) & 0xFF;
			dstPtr[2] = (v>>16) & 0xFF;
# else /* not MSB */
			dstPtr[0] = (v>>16) & 0xFF;
			dstPtr[1] = (v>>8) & 0xFF;
			dstPtr[2] = (v) & 0xFF;
# endif /* not MSB */
			dstPtr += 3;
			srcPtr += 4;
		    }
		}
	    }
	}
%}.
    ] ifFalse:[
	"/
	"/ 16 bit/pixel ...
	"/
	(usedDeviceBitsPerPixel == 16) ifTrue:[
	    padd := width \\ (usedDevicePadding // 16).
	    imageBits := ByteArray uninitializedNew:((width + padd) * height * 2).

	    "/ now, walk over the image and compose 16bit values from the r/g/b triples

%{
	    unsigned char *srcPtr = 0;
	    unsigned char *dstPtr = 0;

	    if (__isByteArrayLike(bytes)) {
		srcPtr = __ByteArrayInstPtr(bytes)->ba_element;
	    } else {
		if (__isExternalBytesLike(bytes)) {
		    srcPtr = __externalBytesAddress(bytes);
		}
	    }
	    if (__isByteArray(imageBits)) {
		dstPtr = __ByteArrayInstPtr(imageBits)->ba_element;
	    } else {
		if (__isExternalBytesLike(imageBits)) {
		    dstPtr = __externalBytesAddress(imageBits);
		}
	    }

	    if (__bothSmallInteger(__INST(height),__INST(width))
	     && __bothSmallInteger(rightShiftR, shiftRed)
	     && __bothSmallInteger(rightShiftG, shiftGreen)
	     && __bothSmallInteger(rightShiftB, shiftBlue)
	     && srcPtr
	     && dstPtr) {
		int rShRed = __intVal(rightShiftR),
		    rShGreen = __intVal(rightShiftG),
		    rShBlue = __intVal(rightShiftB),
		    lShRed = __intVal(shiftRed),
		    lShGreen = __intVal(shiftGreen),
		    lShBlue = __intVal(shiftBlue);
		int x, y, w;
		int p;

		w = __intVal(__INST(width));
		p = __intVal(padd) * 2;

		if ((rShRed == 0) && (rShGreen == 0) && (rShBlue == 0)) {
		    for (y=__intVal(__INST(height)); y > 0; y--) {
			for (x=w; x > 0; x--) {
			    unsigned v;

			    v = srcPtr[0] << lShRed;
			    v |= (srcPtr[1] << lShGreen);
			    v |= (srcPtr[2] << lShBlue);
# ifdef __MSBFIRST
			    ((short *)dstPtr)[0] = v;
# else /* not MSB */
			    dstPtr[0] = (v>>8) & 0xFF;
			    dstPtr[1] = (v) & 0xFF;
# endif /* not MSB */
			    dstPtr += 2;
			    srcPtr += 4;
			}
			dstPtr += p;
		    }
		} else {
		    if (p == 0) {
			int n = __intVal(__INST(height)) * w;

			while (n >= 2) {
			    unsigned w, r, g, b, v;

			    n -= 2;

			    r = srcPtr[0];
			    g = srcPtr[1];
			    b = srcPtr[2];
			    v = (r >> rShRed) << lShRed;
			    v |= ((g >> rShGreen) << lShGreen);
			    v |= ((b >> rShBlue) << lShBlue);
# ifdef __MSBFIRST
			    ((short *)dstPtr)[0] = v;
# else
			    dstPtr[0] = (v>>8) & 0xFF;
			    dstPtr[1] = (v) & 0xFF;
# endif /* not MSB */

			    r = srcPtr[3];
			    g = srcPtr[4];
			    b = srcPtr[5];
			    v = (r >> rShRed) << lShRed;
			    v |= ((g >> rShGreen) << lShGreen);
			    v |= ((b >> rShBlue) << lShBlue);
# ifdef __MSBFIRST
			    ((short *)dstPtr)[1] = v;
# else
			    dstPtr[2] = (v>>8) & 0xFF;
			    dstPtr[3] = (v) & 0xFF;
# endif /* not MSB */
			    dstPtr += 4;
			    srcPtr += 8;
			}

			while (n--) {
			    unsigned r, g, b, v;

			    r = srcPtr[0] >> rShRed;
			    g = srcPtr[1] >> rShGreen;
			    b = srcPtr[2] >> rShBlue;
			    v = r << lShRed;
			    v |= (g << lShGreen);
			    v |= (b << lShBlue);
# ifdef __MSBFIRST
			    ((short *)dstPtr)[0] = v;
# else /* not MSB */
			    dstPtr[0] = (v>>8) & 0xFF;
			    dstPtr[1] = (v) & 0xFF;
# endif /* not MSB */
			    dstPtr += 2;
			    srcPtr += 4;
			}
		    } else {
			for (y=__intVal(__INST(height)); y > 0; y--) {
			    for (x=w; x > 0; x--) {
				unsigned r, g, b, v;

				r = srcPtr[0] >> rShRed;
				g = srcPtr[1] >> rShGreen;
				b = srcPtr[2] >> rShBlue;
				v = r << lShRed;
				v |= (g << lShGreen);
				v |= (b << lShBlue);
# ifdef __MSBFIRST
				((short *)dstPtr)[0] = v;
# else /* not MSB */
				dstPtr[0] = (v>>8) & 0xFF;
				dstPtr[1] = (v) & 0xFF;
# endif /* not MSB */
				dstPtr += 2;
				srcPtr += 4;
			    }
			    dstPtr += p;
			}
		    }
		}
	    }
%}.
	] ifFalse:[
	    "/
	    "/ 32 bits/pixel ...
	    "/
	    (usedDeviceBitsPerPixel == 32) ifTrue:[
		usedDevicePadding := 8.
		imageBits := ByteArray uninitializedNew:(width * height * 4).

		"/ now, walk over the image and compose 32bit values from the r/g/b triples

%{
		unsigned char *srcPtr = 0;
		unsigned char *dstPtr = 0;

		if (__isByteArrayLike(bytes)) {
		    srcPtr = __ByteArrayInstPtr(bytes)->ba_element;
		} else {
		    if (__isExternalBytesLike(bytes)) {
			srcPtr = __externalBytesAddress(bytes);
		    }
		}
		if (__isByteArray(imageBits)) {
		    dstPtr = __ByteArrayInstPtr(imageBits)->ba_element;
		} else {
		    if (__isExternalBytesLike(imageBits)) {
			dstPtr = __externalBytesAddress(imageBits);
		    }
		}

		if (__bothSmallInteger(__INST(height), __INST(width))
		 && __bothSmallInteger(rightShiftR, shiftRed)
		 && __bothSmallInteger(rightShiftG, shiftGreen)
		 && __bothSmallInteger(rightShiftB, shiftBlue)
		 && srcPtr
		 && dstPtr) {
		    int rShRed = __intVal(rightShiftR),
			rShGreen = __intVal(rightShiftG),
			rShBlue = __intVal(rightShiftB),
			lShRed = __intVal(shiftRed),
			lShGreen = __intVal(shiftGreen),
			lShBlue = __intVal(shiftBlue);
		    int x, y, w;

		    w = __intVal(__INST(width));
		    if ((rShRed == 0) && (rShGreen == 0) && (rShBlue == 0)) {
			for (y=__intVal(__INST(height)); y > 0; y--) {
			    for (x=w; x > 0; x--) {
				unsigned v;

				v = srcPtr[0] << lShRed;
				v |= (srcPtr[1] << lShGreen);
				v |= (srcPtr[2] << lShBlue);
# ifdef __MSBFIRST
				((int *)dstPtr)[0] = v;
# else /* not MSB */
				dstPtr[0] = (v>>24) & 0xFF;
				dstPtr[1] = (v>>16) & 0xFF;
				dstPtr[2] = (v>>8) & 0xFF;
				dstPtr[3] = (v) & 0xFF;
# endif /* not MSB */
				dstPtr += 4;
				srcPtr += 4;
			    }
			}
		    } else {
			for (y=__intVal(__INST(height)); y > 0; y--) {
			    for (x=w; x > 0; x--) {
				unsigned r, g, b, v;

				r = srcPtr[0] >> rShRed;
				g = srcPtr[1] >> rShGreen;
				b = srcPtr[2] >> rShBlue;
				v = r << lShRed;
				v |= (g << lShGreen);
				v |= (b << lShBlue);
# ifdef __MSBFIRST
				((int *)dstPtr)[0] = v;
# else /* not MSB */
				dstPtr[0] = (v>>24) & 0xFF;
				dstPtr[1] = (v>>16) & 0xFF;
				dstPtr[2] = (v>>8) & 0xFF;
				dstPtr[3] = (v) & 0xFF;
# endif /* not MSB */
				dstPtr += 4;
				srcPtr += 4;
			    }
			}
		    }
		}
%}.
	    ] ifFalse:[
		"/
		"/ 8 bits/pixel ...
		"/
		(usedDeviceBitsPerPixel == 8) ifTrue:[
		    usedDevicePadding := 8.
		    imageBits := ByteArray uninitializedNew:(width * height).

		    "/ now, walk over the image and compose 8bit values from the r/g/b triples

%{
		    unsigned char *srcPtr = 0;
		    unsigned char *dstPtr = 0;

		    if (__isByteArrayLike(bytes)) {
			srcPtr = __ByteArrayInstPtr(bytes)->ba_element;
		    } else {
			if (__isExternalBytesLike(bytes)) {
			    srcPtr = __externalBytesAddress(bytes);
			}
		    }
		    if (__isByteArray(imageBits)) {
			dstPtr = __ByteArrayInstPtr(imageBits)->ba_element;
		    } else {
			if (__isExternalBytesLike(imageBits)) {
			    dstPtr = __externalBytesAddress(imageBits);
			}
		    }

		    if (__bothSmallInteger(__INST(height), __INST(width))
		     && __bothSmallInteger(rightShiftR, shiftRed)
		     && __bothSmallInteger(rightShiftG, shiftGreen)
		     && __bothSmallInteger(rightShiftB, shiftBlue)
		     && srcPtr
		     && dstPtr) {
			int rShRed = __intVal(rightShiftR),
			    rShGreen = __intVal(rightShiftG),
			    rShBlue = __intVal(rightShiftB),
			    lShRed = __intVal(shiftRed),
			    lShGreen = __intVal(shiftGreen),
			    lShBlue = __intVal(shiftBlue);
			int x, y, w;

			w = __intVal(__INST(width));
			if ((rShRed == 0) && (rShGreen == 0) && (rShBlue == 0)) {
			    for (y=__intVal(__INST(height)); y > 0; y--) {
				for (x=w; x > 0; x--) {
				    unsigned v;

				    v = srcPtr[0] << lShRed;
				    v |= (srcPtr[1] << lShGreen);
				    v |= (srcPtr[2] << lShBlue);
				    dstPtr[0] = v;

				    dstPtr += 1;
				    srcPtr += 4;
				}
			    }
			} else {
			    for (y=__intVal(__INST(height)); y > 0; y--) {
				for (x=w; x > 0; x--) {
				    unsigned r, g, b, v;

				    r = srcPtr[0] >> rShRed;
				    g = srcPtr[1] >> rShGreen;
				    b = srcPtr[2] >> rShBlue;
				    v = r << lShRed;
				    v |= (g << lShGreen);
				    v |= (b << lShBlue);

				    dstPtr[0] = v;

				    dstPtr += 1;
				    srcPtr += 4;
				}
			    }
			}
		    }
%}.
		]
	    ].
	]
    ].

    imageBits isNil ifTrue:[
	'IMAGE: unimplemented trueColor depth in #rgbImageAsTrueColorFormOn: ' errorPrint.
	usedDeviceBitsPerPixel errorPrintCR.
	^ self asMonochromeFormOn:aDevice
    ].

    form := Form width:width height:height depth:usedDeviceDepth onDevice:aDevice.
    form isNil ifTrue:[
	'Depth32Image [warning]: display bitmap creation failed' errorPrintCR.
	^ nil
    ].
    form initGC.

    form
	copyBitsFrom:imageBits
	bitsPerPixel:usedDeviceBitsPerPixel
	depth:usedDeviceDepth
	padding:usedDevicePadding
	width:width height:height
	x:0 y:0 toX:0 y:0.

    ^ form

    "Created: / 27-05-2007 / 16:54:19 / cg"
    "Modified: / 29-05-2007 / 12:19:04 / cg"
! !

!Depth32Image methodsFor:'image manipulations'!

negative
    |bytes index newImage newBytes nBytes r g b|

    photometric ~~ #rgb ifTrue:[
        ^ super negative.
    ].
    bytes := self bits.

    newImage := self copy.
    nBytes := bytes size.
    newImage bits:(newBytes := ByteArray new:nBytes).
    index := 1.
    [index < nBytes] whileTrue:[
        r := bytes at:index.
        newBytes at:index put:(255-r).
        index := index + 1.
        g := bytes at:index.
        newBytes at:index put:(255-g).
        index := index + 1.
        b := bytes at:index.
        newBytes at:index put:(255-b).
        index := index + 1.
        b := bytes at:index.
        newBytes at:index put:b.
        index := index + 1.
    ].
    ^ newImage
! !

!Depth32Image methodsFor:'initialization'!

initialize
    super initialize.
    samplesPerPixel := 4.
    bitsPerSample := #(8 8 8 8).

    "Created: / 27-05-2007 / 14:09:16 / cg"
! !

!Depth32Image 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, byte3, byte4;
    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);
	    byte3 = *(srcP+2);
	    byte4 = *(srcP+3);
	    srcP += 4;
	    for (i=_mag; i>0; i--) {
		*dstP = byte1;
		*(dstP+1) = byte2;
		*(dstP+2) = byte3;
		*(dstP+3) = byte4;
		dstP += 4;
	    }
	}
	RETURN (self);
    }
%}.
    super
	magnifyRowFrom:srcBytes offset:srcStart
	into:dstBytes offset:dstStart factor:mX

    "Created: / 28-05-2007 / 15:20:52 / cg"
! !

!Depth32Image methodsFor:'queries'!

bitsPerPixel
    "return the number of bits per pixel"

    ^ 32

    "Created: 24.4.1997 / 19:00:28 / cg"
!

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

    ^ width * 32

    "Created: 24.4.1997 / 19:00:28 / cg"
!

bitsPerSample
    "return the number of bits per sample.
     The return value is an array of bits-per-plane."

    bitsPerSample notNil ifTrue:[^ bitsPerSample].
    ^ #(8 8 8 8)
!

blueBitsOf:pixel
    "given a pixel-value, return the blue component as byteValue (0..255)"

    ^ (pixel bitShift:-8) bitAnd:16rFF.
!

blueComponentOf:pixel
    "given a pixel-value, return the blue component in percent (0..100)"

    ^ (100.0 / 255.0) *  ((pixel bitShift:-8) bitAnd:16rFF).
!

blueMaskForPixelValue
    "return the mask used with translation from pixelValues to blueBits"

    ^ 16rFF
!

blueShiftForPixelValue
    "return the shift amount used with translation from pixelValues to blueBits"

    ^ -8
!

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

    ^ width * 4.

    "Created: 24.4.1997 / 19:00:28 / cg"
!

greenBitsOf:pixel
    "given a pixel-value, return the green component as byteValue (0..255)"

    ^ (pixel bitShift:-16) bitAnd:16rFF.
!

greenComponentOf:pixel
    "given a pixel-value, return the green component in percent (0..100)"

    ^ (100.0 / 255.0) * ((pixel bitShift:-16) bitAnd:16rFF).
!

greenMaskForPixelValue
    "return the mask used with translation from pixelValues to redBits"

    ^ 16rFF
!

greenShiftForPixelValue
    "return the shift amount used with translation from pixelValues to greenBits"

    ^ -16
!

hasAlphaChannel
    ^ true
!

redBitsOf:pixel
    "given a pixel-value, return the red component as byteValue (0..255)"

    ^ (pixel bitShift:-24) bitAnd:16rFF.
!

redComponentOf:pixel
    "given a pixel-value, return the red component in percent (0..100)"

    ^ (100.0 / 255.0) * ((pixel bitShift:-24) bitAnd:16rFF).
!

redMaskForPixelValue
    "return the mask used with translation from pixelValues to redBits"

    ^ 16rFF
!

redShiftForPixelValue
    "return the shift amount used with translation from pixelValues to redBits"

    ^ -24
!

rgbFromValue:pixelValue
    "given a pixel value, return the corresponding 24bit rgbValue (rrggbb, red is MSB)."

    ^ pixelValue rightShift:8     "lsb is alpha channel"
!

samplesPerPixel
    "return the number of samples per pixel in the image."

    samplesPerPixel notNil ifTrue:[^ samplesPerPixel].
    ^ 4
!

valueFromRedBits:redBits greenBits:greenBits blueBits:blueBits
    ^ (((((redBits bitShift:8) bitOr:greenBits) bitShift:8) bitOr:blueBits) bitShift:8) bitOr:255
! !

!Depth32Image class methodsFor:'documentation'!

version
    ^ '$Header: /cvs/stx/stx/libview/Depth32Image.st,v 1.14 2015-04-23 21:31:10 stefan Exp $'
!

version_CVS
    ^ '$Header: /cvs/stx/stx/libview/Depth32Image.st,v 1.14 2015-04-23 21:31:10 stefan Exp $'
! !