Available in LEADTOOLS Imaging Pro, Vector, Document, and Medical Imaging toolkits. |
#include "l_bitmap.h"
L_LTKRN_API L_INT L_SetBitmapDataPointer(pBitmap, pData, dwSize)
pBITMAPHANDLE pBitmap; |
/* pointer to the bitmap handle */ |
L_UCHAR *pData; |
/* data pointer */ |
L_SIZE_T dwSize; |
/* size of the data buffer pointed to by pData */ |
Sets the data pointer for the specified bitmap to the specified data pointer pData.
Parameter |
Description |
pBitmap |
Pointer to the bitmap handle that references the bitmap whose data pointer will be set. |
pData |
Data pointer used to set the specified bitmaps data pointer. |
dwSize |
Size of the data buffer pointed to by pData. |
Returns
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
Comments
This function can be used to change the data pointer of a bitmap that was created by L_CreateBitmap, or allocated by L_AllocateBitmap, with memory type TYPE_USER. The data pointer to of the bitmap is set to the data pointer passed in through pData.
You are responsible for managing the image data. L_FreeBitmap will not free pData.
The memory buffer pointed to by pData must be valid when the bitmap is being used. If you free a memory buffer that is referenced by a bitmap, you will get access violations when you try to use that bitmap.
If you pass NULL for pData, the bitmap has no bitmap data. You should not try to use a bitmap that has no data pointer.
Required DLLs and Libraries
LTKRN 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
Win32, x64.
See Also
Functions: |
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Topics: |
Example
Please note that you need to free the memory allocated for the bitmap and the bitmap data using the following:
L_INT SetBitmapDataPointerExample(pBITMAPHANDLE pBitmap) { // allocate a buffer large enough to hold two copies of the image L_UCHAR* pBuffer = (L_UCHAR*)GlobalAllocPtr(GMEM_MOVEABLE, pBitmap->Size * 2); L_INT i; L_INT nRet; // loop and get the flipped and normal versions of the image into pBuffer for(i = 0; i < pBitmap->Height; i++) { nRet =(L_INT) L_GetBitmapRow(pBitmap, pBuffer + i * pBitmap->BytesPerLine, pBitmap->ViewPerspective == TOP_LEFT ? pBitmap->Height - i - 1 : i, pBitmap->BytesPerLine); if(nRet < 1) return nRet; memcpy( pBuffer + pBitmap->Size + (pBitmap->Height - i - 1) * pBitmap->BytesPerLine, pBuffer + i * pBitmap->BytesPerLine, pBitmap->BytesPerLine); } // free the original image. Note that it is assumed that the image was 24 bit // for simplicity, so that it is not necessary to pass an array of palette entries to L_CreateBitmap // For color images, you would have to get the palette entries and pass them instead of NULL L_FreeBitmap(pBitmap); // this sets the image to be the flipped version if((nRet = L_CreateBitmap(pBitmap, sizeof(BITMAPHANDLE), TYPE_USER, pBitmap->Width, pBitmap->Height, pBitmap->BitsPerPixel, pBitmap->Order, NULL, TOP_LEFT, pBuffer, pBitmap->Size)) == SUCCESS) { MessageBox( NULL, TEXT("The image is flipped"), TEXT(""), MB_OK); // this sets the image to be the non-flipped version return L_SetBitmapDataPointer(pBitmap, pBuffer + pBitmap->Size, pBitmap->Size); } return nRet; }