"

 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 (eg. rgb+alpha) images.

    Only the minimum protocol is implemented here; much more is

    needed for higher performance operations on depth32 images.

    (however, 32bit images are currntly relatively seldom used, 

     so falling back into the slow general methods from Image does not hurt too much.

     This situation will change, when more support for alpha channels is added and they

     are more heavily used in ST/X...)

    [author:]

        Claus Gittinger

    [see also:]

        Depth1Image Depth2Image Depth4Image Depth8Image Depth16Image Depth24Image

        ImageReader

"

! !

!Depth32Image class methodsFor:'queries'!

defaultPhotometric

    "return the default photometric pixel interpretation"

    "/ here we return #rgb - thus ignoring any alpha channel.

    "/ the reason is that many displays and graphics formats do use

    "/ 32bit per pixel, but provide an alpha value of 0, instead of 255.

    "/ Thus returning rgba here would make many images invisible (totally transparent)

    ^ #rgb

    "Created: / 27-05-2007 / 14:03:59 / cg"

    "Modified: / 16-02-2017 / 17:41:09 / cg"

    "Modified (comment): / 16-02-2017 / 19:00:25 / 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 aVal|

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

    photometric == #rgb ifTrue:[

        rVal := bytes at:(index).

        gVal := bytes at:(index + 1).

        bVal := bytes at:(index + 2).

        ^ Color redByte:rVal greenByte:gVal blueByte:bVal

    ].

    photometric == #rgba ifTrue:[

        rVal := bytes at:(index).

        gVal := bytes at:(index + 1).

        bVal := bytes at:(index + 2).

        aVal := bytes at:(index + 3).

        ^ Color redByte:rVal greenByte:gVal blueByte:bVal alphaByte:aVal

    ].

    photometric == #argb ifTrue:[

        aVal := bytes at:(index).

        rVal := bytes at:(index + 1).

        gVal := bytes at:(index + 2).

        bVal := bytes at:(index + 3).

        ^ Color redByte:rVal greenByte:gVal blueByte:bVal alphaByte:aVal

    ].

    "/ the inherited method should handle all cases.

    ^ super colorAtX:x y:y. 

!

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:[

        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:0.              

        ^ self

    ].

    (photometric == #rgba) ifTrue:[

        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:(aColor alphaByte). "alpha channel"

        ^ self

    ].

    (photometric == #argb) ifTrue:[

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

        bytes at:(index) put:255.                    "alpha channel"

        bytes at:(index + 1) put:(aColor redByte).

        bytes at:(index + 2) put:(aColor greenByte).

        bytes at:(index + 3) put:(aColor blueByte).             

        ^ self

    ].

    super colorAtX:x y:y put:aColor.

    "Modified: / 21-02-2017 / 01:49:58 / cg"

!

pixelAtX:x y:y

    "retrieve a pixel at x/y; return a pixelValue.

     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.

    |pixelIndex "{ Class: SmallInteger }"|

%{  /* NOCONTEXT */

    OBJ b = __INST(bytes);

    OBJ w = __INST(width);

    if (__isByteArrayLike(b)

     && __bothSmallInteger(x, y)

     && __isSmallInteger(w)

     && (__INST(pixelFunction)==nil) ) {

        int _idx;

        _idx = ((__intVal(w) * __intVal(y)) + __intVal(x))*4;

        if (((unsigned)(_idx+3)) < __byteArraySize(b)) {

            unsigned char *pPix = &(__ByteArrayInstPtr(b)->ba_element[_idx]);

            unsigned int _pix;

#if __POINTER_SIZE__ == 8

            RETURN( __MKSMALLINT(_pix) );

#else

            RETURN( __MKUINT(_pix) );

#endif

        }

    }

%}.

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

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

    "left pixel in high bits"

    "Created: / 24-04-1997 / 19:00:28 / 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

    ].

    "Created: / 24-04-1997 / 19:00:28 / 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."

     w "{ Class: SmallInteger }"|

    bytes := self bits.

    dstIdx := (y * self bytesPerRow) + 1.

    w := width - 1.

    0 to:w do:[:col |

        pixel := pixelArray at:(startIndex + col).

        dstIdx := dstIdx + 4.

    ].

    ^ pixelArray

! !

!Depth32Image methodsFor:'converting rgb images'!

computeAlphaValuesFromMask:aMaskImage

    "convert a mask into alpha values;

    |alphaMask|

    self 

        valuesFromX:0 y:0 toX:(width-1) y:(height-1)

        do:[:x :y :pixelValue |

            (aMaskImage pixelAtX:x y:y) ~~ 0 ifTrue:[

                self pixelAtX:x y:y put:(pixelValue bitOr:alphaMask).

            ] ifFalse:[

                self pixelAtX:x y:y put:(pixelValue bitClear:alphaMask).

            ].

        ].

    photometric := #rgba

!

rgbImageAsTrueColorFormOn:aDevice

    "return a truecolor form from the rgba or argb-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;

        int redOffs = 0;

        int greenOffs = 1;  

        int blueOffs = 2;

        int alphaOffs = 3;

        if (__INST(photometric) == @symbol(argb)) {

            redOffs = 1; greenOffs = 2; blueOffs = 3; alphaOffs = 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--) {                        

# ifdef __MSBFIRST

                            dstPtr[0] = srcPtr[redOffs];

                            dstPtr[1] = srcPtr[greenOffs];

                            dstPtr[2] = srcPtr[blueOffs];

# else /* not MSB */

                            dstPtr[0] = srcPtr[blueOffs];

                            dstPtr[1] = srcPtr[greenOffs];

                            dstPtr[2] = srcPtr[redOffs];

# 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[redOffs] << lShRed;

                            v |= (srcPtr[greenOffs] << lShGreen);

                            v |= (srcPtr[blueOffs] << 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[redOffs] >> rShRed;

                        g = srcPtr[greenOffs] >> rShGreen;

                        b = srcPtr[blueOffs] >> 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:[

        "/

        "/ 8, 16 or 32 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;

            int redOffs = 0;

            int greenOffs = 1;  

            int blueOffs = 2;

            int alphaOffs = 3;

            if (__INST(photometric) == @symbol(argb)) {

                redOffs = 1; greenOffs = 2; blueOffs = 3; alphaOffs = 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[redOffs] << lShRed;

                            v |= (srcPtr[greenOffs] << lShGreen);

                            v |= (srcPtr[blueOffs] << lShBlue);

# ifdef __MSBFIRST

                            ((short *)dstPtr)[0] = v;

# else /* not MSB */

                            dstPtr[0] = (v>>8) & 0xFF;

                            dstPtr[1] = (v) & 0xFF;

# endif /* not MSB */

                            dstPtr += 2;