This function obtains the pixel at coordinates (nXpos, nYpos), storing it right justified (that is, in the least significant bits) at the location pointed to by lpPixel.
Declaration:
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AT_ERRCOUNT ACCUAPI IG_DIB_pixel_get (
HIGEAR hIGear,
AT_PIXPOS nXpos,
AT_PIXPOS nYpos,
LPAT_PIXEL lpPixel
);
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Arguments:
| hIGear | HIGEAR handle of image. |
| nXpos | X offset (in pixels) from beginning of raster line. First pixel on line is pixel number 0. |
| nYpos | Raster line number. 0 is top line. |
| lpPixel | Far pointer to byte at which to store pixel (or to a 3-byte area if a 24-bit pixel). |
Return Value:
Returns the number of ImageGear errors that occurred during this function call. If there are no errors, the return value is IGE_SUCCESS.
Supported Raster Image Formats:
All pixel formats supported by ImageGear Professional.
Sample:
Pixel Access, FlashPix
Example:
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HIGEAR hIGear; /* HIGEAR handle of image */ AT_PIXEL cPixelValue[3];/* 3 bytes in case 24-bit image */ /* Get value of the upper-leftmost pixel in image: */ IG_DIB_pixel_get ( hIGear, 0, 0, &cPixelValue[0] ); |
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Remarks:
If the pixel is 1-bit or 4-bit, the remaining bits of the byte will be set to zeroes.
If the pixel is 24-bit, 3 bytes are returned. These will be in the order Blue-Green-Red (unless you have changed the order of the image bitmap bytes such as by calling function IG_IP_swap_red_blue()).
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ImageGear's pixel access functions consider the coordinates (0,0) to refer to the upper left-hand corner of the bitmap data. They do not follow the DIB's orientation, which considers (0,0) to refer to the lower left-hand corner of the bitmap. |