L_GetRgnContourPoints
#include "l_bitmap.h"
L_INT EXT_FUNCTION L_GetRgnContourPoints (pBitmap pXForm, ppPoints, puSize)
pBITMAPHANDLE pBitmap; |
/* pointer to the bitmap handle */ |
pRGNXFORM pXForm; |
/* pointer to a coordinate-translation structure */ |
/* pointer to a pointer */ | |
/* pointer to a variable to be updated */ |
Returns the contour coordinates of a region.
Parameter |
Description |
pBitmap |
Pointer to the bitmap handle. |
pXForm |
Pointer to an RGNXFORM structure that LEADTOOLS uses to translate between display coordinates and bitmap coordinates. |
|
If you specify NULL in this parameter, the scalar fields default to 1, the offsets default to 0, and the view perspective defaults to the bitmap's view perspective. |
ppPoints |
Pointer to a pointer to be updated with an array that contains the coordinate points of the contour for the specified region. A memory buffer for this array is allocated by the function. When the array is no longer needed, the user should free it by calling the GlobalFreePtr macro. |
puSize |
Address of a variable to be updated with the number of points in the buffer. |
Returns
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
Comments
This function works only on bitmaps having a region. If a bitmap does not have a region the function returns the error: Not Initialized.
To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.
This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.
This function supports signed data images.
Required DLLs and Libraries
LTIMG For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
Platforms
Windows 95 / 98 / Me, Windows 2000 / XP.
See Also
Example
BITMAPHANDLE LeadBitmap; /* Bitmap handle for the image */
RECT rcRect;
POINT L_FAR * pPoints;
L_UINT uSize;
/* Load a bitmap at its own bits per pixel */
L_LoadBitmap (TEXT("image3.cmp"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
rcRect.top = LeadBitmap.Height/3;
rcRect.bottom = LeadBitmap.Height*2/3;
rcRect.left = LeadBitmap.Width/3;
rcRect.right = LeadBitmap.Width*2/3;
L_SetBitmapRgnEllipse (&LeadBitmap, NULL, &rcRect, L_RGN_SET);
L_GetRgnContourPoints (&LeadBitmap, NULL, &pPoints, &uSize);