Here is an excerpt from one of my plugin functions that does this,
ignore the extraneous code, but it will give you an idea:
static long buildRGBPicture (long imageWidth,long imageHeight, long
imageBitsPerSample,
long
redImageDataAddress, long grnImageDataAddress, long
bluImageDataAddress, long grayImageDataAddress,
REALmemoryBlock RGBlevelsNsatVals, long transferFnAddress,
long pseudocolorMap, REALpicture displayedPic)
{ register long xCtr, yCtr, n;
unsigned char *transferFnPtr;
register unsigned short *redImageShortDataPtr,
*grnImageShortDataPtr, *bluImageShortDataPtr, *grayImageShortDataPtr;
long imagePixels,
imageBytesPerSample;
register long nShiftBits,
sourceLineAddrOffset, imageDataLineOffset;
REALpictureDescription sourceDes = {0}; // Create a
Picture Description
PixMapHandle sourceMap;
long sourceWidth,
sourceHeight, lineLen, j;
long *sourceData; // base
addr of pix data
register long redSample, grnSample,
bluSample, graySample, RGBmax,
satValue, redColor, grnColor, bluColor;
register float redSatValue, grnSatValue,
bluSatValue,
graySatValue, redFloorValue, grnFloorValue, bluFloorValue,
grayFloorValue;
register float redLevel, grnLevel, bluLevel,
grayLevel;
long* RGBlevelsNsatValsPtr;
register float redSlope, grnSlope, bluSlope,
graySlope;
register unsigned char *redTransferArray, *grnTransferArray,
*bluTransferArray, *grayTransferArray; // now used to pre-computed
additional transfer fns for efficient sat pix, rather than evaluating
each pixel transfer individually
register unsigned char *pseudocolorLUTRed, *pseudocolorLUTGrn,
*pseudocolorLUTBlu; // used to for new pseudocolor channel display
REALLockPictureDescription( displayedPic , &sourceDes ); // Lock the
Description
sourceMap = GetGWorldPixMap( (GWorldPtr) sourceDes.pictureData); //
Get the pixmap
// Get pixmap parameters
sourceWidth = sourceDes.width;
sourceHeight = sourceDes.height;
lineLen = GetPixRowBytes( sourceMap ) / 4;
// Lock the pixmap
if ( !LockPixels( sourceMap ) )
{ REALUnlockPictureDescription( displayedPic ); // lock failed: unlock
Description & return error
return 3;
}
sourceData = (long*) GetPixBaseAddr( sourceMap ); // get the base addr
of pix data
sourceLineAddrOffset = 0;
imageShortDataPtr = (unsigned short *) imageDataAddress;
{ for (yCtr=0; yCtr<imageHeight; yCtr++)
{ for (xCtr=0; xCtr<imageWidth; xCtr++)
{ // get your redSample, grnSample, bluSample your own
way, range 0..255
redSample = redTransferArray[*(imageShortDataPtr++)];
grnSample = grnTransferArray[*(imageShortDataPtr++)];
bluSample = bluTransferArray[*(imageShortDataPtr++)];
sourceData[sourceLineAddrOffset+xCtr] = (redSample <<
16) |
(grnSample << 8) | (bluSample); // Intel needs to be byte-swapped, see
my recent post
}
sourceLineAddrOffset += lineLen; // an addition may be
cheaper than
a mult as before
}
}
REALUnlockPictureDescription( displayedPic ); // unlock description
before returning
On 2/17/07, David Linker <[EMAIL PROTECTED]> wrote:
How do I load raw image data, say RGB pixels, into a picture without
doing it one pixel at a time.
I am working on a scanner front end for Mac OS X, and will be getting
the image data as pixels, which may be B/W, grayscale or color, and
the later as separate planes of color or interlaced.
The data will be read into a MemoryBlock, and it seems that there
should be a method for converting at least some of these formats
directly to what used to be a PixMap on Mac OS.
Any ideas?
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Peter K. Stys, MD
Professor of Medicine(Neurology), Senior Scientist
Ottawa Health Research Institute, Div. of Neuroscience
Ottawa Hospital / University of Ottawa
Ontario, CANADA
tel: (613)761-5444
fax: (613)761-5330
http://www.ohri.ca/profiles/stys.asp
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