L_LineProfile
#include "l_bitmap.h"
L_INT EXT_FUNCTION L_LineProfile(pBitmapHndl, FirstPoint, SecondPoint, pRed, pGreen, pBlue)
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pBITMAPHANDLE pBitmapHndl; |
/* pointer to the bitmap handle */ |
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POINT FirstPoint; |
/* starting point of the line */ |
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POINT SecondPoint; |
/* end point of the line */ |
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/* pointer to a pointer */ | |
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/* pointer to a pointer */ | |
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/* pointer to a pointer */ |
Allocates three arrays and updates them with the R, G and B profile for each pixel in the specified line.
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Parameter |
Description |
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pBitmapHndl |
Pointer to the bitmap handle that references the bitmap for which to get the line profile. |
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FirstPoint |
POINT structure that contains the starting point for the line. |
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SecondPoint |
POINT structure that contains the end point for the line. Information for this point is included in the arrays. |
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pRed |
Pointer to a pointer to be updated with an array that contains the red values for the line specified by FirstPoint and SecondPoint. A memory buffer for this array is allocated by the function. When the array is no longer needed, it should be freed by the user by calling the GlobalFreePtr macro. |
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pGreen |
Pointer to a pointer to be updated with an array that contains the green values for the line specified by FirstPoint and SecondPoint. A memory buffer for this array is allocated by the function. When the array is no longer needed, it should be freed by the user by calling the GlobalFreePtr macro. |
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pBlue |
Pointer to a pointer to be updated with an array that contains the blue values for the line specified by FirstPoint and SecondPoint. A memory buffer for this array is allocated by the function. When the array is no longer needed, it should be freed by the user by calling the GlobalFreePtr macro. |
Returns
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SUCCESS |
The function was successful. |
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< 1 |
An error occurred. Refer to Return Codes. |
Comments
The range of the returned values will be from 0 - 65535 for 64-bit, 48-bit and 16-bit grayscale images and from 0 - 4095 for 12-bit grayscale images. Otherwise, it is from 0 to 255.
This function allocates memory buffers for the three arrays using the GlobalAllocPtr macro. When the buffers are no longer needed, they should be freed by calling the GlobalFreePtr macro. If the GlobalFreePtr macro is not supported by the compiler, the buffers can be freed using the following code:
void MyGlobalFreePtr(void *ptr)
{
HGLOBAL hGlobal = (HGLOBAL) GlobalHandle(ptr);
GlobalUnlock(hGlobal);
GlobalFree(hGlobal);
}
This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Supportfor 12 and 16-bit grayscale and 48 and 64-bit color images is available only in the Document/Medical toolkits.
This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.
Required DLLs and Libraries
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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
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Functions: |
L_AccessBitmap, L_ReleaseBitmap, L_ClearBitmap, L_GetBitmapRow, L_PutBitmapRow, L_GetBitmapRowCol, L_PutBitmapRowCol, L_PutPixelColor, L_GetPixelColor |
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Topics: |
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Example
/* This example assumes there is a bitmap loaded into Bitmap, which is of type BITMAPHANDLE. */
L_INT L_FAR * nactRed;
L_INT L_FAR * nactGreen;
L_INT L_FAR * nactBlue;
POINT StartPoint, EndPoint;
BITMAPHANDLE Bitmap;
nactRed=NULL;
nactGreen=NULL;
nactBlue=NULL;
L_LineProfile(&Bitmap,StartPoint,EndPoint,&nactRed,&nactGreen,&nactBlue);
// … use the colors in the arrays here
// free the three buffers
GlobalFreePtr(nactRed);
GlobalFreePtr(nactGreen);
GlobalFreePtr(nactBlue);