L_StartResize
#include "l_bitmap.h"
L_LTKRN_API L_INT L_StartResize(nOldWidth, nOldHeight, nNewWidth, nNewHeight, ppResizeData)
L_INT nOldWidth; |
/* original width of the image */ |
L_INT nOldHeight; |
/* original height of the image */ |
L_INT nNewWidth; |
/* new width for the image */ |
L_INT nNewHeight; |
/* new height for the image */ |
L_VOID** ppResizeData; |
/* address of a pointer for resize data */ |
Sets up information for the L_Resize function.
Parameter |
Description |
nOldWidth |
Specifies the original width of the image. |
nOldHeight |
Specifies the original height of the image. |
nNewWidth |
Specifies the new width for the image. |
nNewHeight |
Specifies the new height for the image. |
ppResizeData |
Address of a pointer for a resize data packet. This specifies the area to be filled in with data for the L_Resize function. L_StartResize allocates the memory, and L_StopResize frees it. Note that you will pass the address of a pointer variable. |
Returns
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
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
Windows 2000 / XP/Vista, Windows CE.
See Also
Functions: |
L_ResizeBitmap, L_SizeBitmap, L_Resize, L_StopResize, L_DlgResize, L_SizeBitmapInterpolate |
Topics: |
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Example
For complete sample code, refer to the RESIZE example. This example resizes each line in one bitmap and writes it to another bitmap.
L_INT StartResizeExample(pBITMAPHANDLE pLeadBitmap) { L_INT nRet; L_VOID* pResizeData; L_INT CopyWidth, CopyHeight; L_UCHAR* pBuf; /* Buffer to hold the input row */ HGLOBAL hBuf; /* Handle to the input buffer */ BITMAPHANDLE TmpBitmap; /* Bitmap containing input data */ L_INT DestRow; /* Row counter for the output */ L_INT i, n; /* Loop counters */ /* Load the input bitmap, at 24 bits per pixel */ nRet = L_LoadBitmap (TEXT("C:\\Program Files\\LEAD Technologies\\LEADTOOLS 15\\Images\\IMAGE3.CMP"), &TmpBitmap, sizeof(BITMAPHANDLE), 24, ORDER_BGR, NULL, NULL); if(nRet != SUCCESS) return nRet; /* Allocate the buffer the size of one line of 24-bit input data */ hBuf = GlobalAlloc(GMEM_MOVEABLE, TmpBitmap.Width * 3); pBuf = (L_UCHAR*)GlobalLock( hBuf ); /* Create the new bitmap */ if(pLeadBitmap->Flags.Allocated) L_FreeBitmap(pLeadBitmap); nRet = L_CreateBitmap(pLeadBitmap, sizeof(BITMAPHANDLE), TYPE_CONV, TmpBitmap.Width / 2, TmpBitmap.Height / 2, 24, TmpBitmap.Order, NULL, TmpBitmap.ViewPerspective, NULL, 0); if(nRet != SUCCESS) return nRet; /* Initialize the resize process */ nRet = L_StartResize (TmpBitmap.Width, TmpBitmap.Height, TmpBitmap.Width / 2, TmpBitmap.Height / 2, &pResizeData); if(nRet != SUCCESS) return nRet; /* Initialize the destination row number */ DestRow = 0; /* Use L_Resize to process each row in the bitmap */ L_AccessBitmap(pLeadBitmap); L_AccessBitmap(&TmpBitmap); for(i=0; i < TmpBitmap.Height; i++) { nRet = (L_INT)L_GetBitmapRow(&TmpBitmap, pBuf, i, TmpBitmap.BytesPerLine); if(nRet < 1) return nRet; nRet = L_Resize (pBuf, i, TmpBitmap.BitsPerPixel, &CopyWidth, &CopyHeight, pResizeData); if(nRet != SUCCESS) { if(nRet != 0)// 0 means line was not needed for the resize return nRet; } /* Output as many or as few rows as nRet = L_Resize supplies */ for(n=0; n < CopyHeight; n++) { nRet =(L_INT )L_PutBitmapRow(pLeadBitmap, pBuf, DestRow, CopyWidth * 3); if(nRet < 1) return nRet; DestRow++; } } L_ReleaseBitmap(&TmpBitmap); L_ReleaseBitmap(pLeadBitmap); L_FreeBitmap(&TmpBitmap); /* End the resize process */ nRet = L_StopResize (pResizeData); if(nRet != SUCCESS) return nRet; /* Free memory that we no longer need */ GlobalFree(hBuf); return SUCCESS; }