ImageGear Professional for Unix
IG_DIB_row_set
| ImageGear Professional v18.2 > API Reference Guide > Core Component API Reference > Core Component Functions Reference > DIB Functions > IG_DIB_row_set |
This function writes a consecutive row of nLength pixels that begin at lpPixel, into image hIGear`s DIB image bitmap.
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AT_ERRCOUNT ACCUAPI IG_DIB_row_set (
HIGEAR hIGear,
AT_PIXPOS nXpos,
AT_PIXPOS nYpos,
AT_DIMENSION nLength,
const LPVOID lpPixel,
AT_MODE nFormat
);
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| Name | Type | Description |
| hIGear | HIGEAR | HIGEAR handle of image. |
| nXpos | AT_PIXPOS | X offset (in pixels) from beginning of raster line. First pixel on line is pixel number 0. |
| nYpos | AT_PIXPOS | Raster line number. 0 is top line. |
| nLength | AT_DIMENSION | Number of consecutive pixels to transfer. |
| lpPixel | const LPVOID | Far pointer to byte at which the pixels to transfer begin. |
| nFormat | AT_MODE | Format in which the raster data is stored: IG_PIXEL_PACKED, IG_PIXEL_UNPACKED, IG_PIXEL_RLE. |
Returns the number of ImageGear errors that occurred during this function call. If there are no errors, the return value is IGE_SUCCESS.
All pixel formats supported by ImageGear Professional.
See the example for function IG_DIB_row_get().
The row is written into raster line nYpos, beginning at pixel offset nXpos. If nFormat is set to IG_PIXEL_UNPACKED, and the image is 1-bit or 4-bit, your pixels to be transferred should be one to a byte, right justified (that is, in the least significant bits). If a 24-bit image, each pixel should occupy 3 bytes, ordered Blue-Green-Red. (See the section Device-Independent Bitmaps (DIB) for more details on pixel storage in DIBs.)
(If (nXpos + nLength) is greater than the width of the image as indicated in the DIB header, an error will result.
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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. If the image you are modifying is 1-bit, you will probably need to convert the image from run-end encoded to a standard DIB, before you can set pixel values. Please see the section Accessing Image Pixels for details. |