#include "l_bitmap.h"
L_LTKRN_API L_HDIB L_ConvertToDIB(pBitmap, uType)
Converts a LEAD Technologies bitmap into a Windows device independent bitmap (DIB). When this function is completed, there are two copies of the image in memory: the DIB and the original LEAD bitmap. Freeing one will not affect the other.
Pointer to the bitmap handle referencing the bitmap to change.
Flag that indicates the type of DIB to create. Possible values are:
Value | Meaning |
---|---|
DIB_BITMAPINFOHEADER | [0] DIB that uses a BITMAPINFOHEADER |
DIB_BITMAPV4HEADER | [1] DIB that uses a BITMAPV4HEADER. (Introduced in Windows 95 and Windows NT 4.0) |
DIB_BITMAPV5HEADER | [2] DIB that uses a BITMAPV5HEADER (Introduced in Windows 2000 and Windows 98) |
This function will return a handle to a DIB.
This function allocates a DIB bitmap and copies the LEAD bitmap to the DIB.
A DIB consists of one of the following:
followed by a color table and then the bitmap data. The resulting DIB type is determined by the value of the uType
flag.
The orientation of the image and color order will depend on how the image was loaded into the LEAD bitmap.
If you want to load another image using the same bitmap handle, you must initialize the bitmap handle again.
When you no longer need the DIB, you can free it using the Windows GlobalFree function.
Required DLLs and Libraries
Win32, x64, Linux.
For complete sample code, refer to the DIBDDB
example.
This example takes a LEAD bitmap, converts it to a V5 DIB and writes
out the DIB as a bitmap file
#include <fcntl.h>
static L_INT MySaveFile(HGLOBAL hDIB,
L_TCHAR* pszFileName)
{
DWORD dwSize;
HANDLE fp;
L_UCHAR* pDIB;
BITMAPFILEHEADER bfh;
PBITMAPINFOHEADER pbih;
L_SIZE_T zDIBsize;
zDIBsize = GlobalSize(hDIB);
bfh.bfType = 0x4d42; //"BM";
bfh.bfSize = (DWORD) (sizeof(BITMAPFILEHEADER) + zDIBsize);
bfh.bfReserved1 = 0;
bfh.bfReserved2 = 0;
pDIB = (L_UCHAR *)GlobalLock(hDIB);
pbih = (PBITMAPINFOHEADER)pDIB;
// Compute the offset to the array of color indices.
bfh.bfOffBits = (DWORD) sizeof(BITMAPFILEHEADER) +
pbih->biSize + pbih->biClrUsed * sizeof (RGBQUAD);
fp = CreateFile(pszFileName, GENERIC_WRITE | GENERIC_READ , 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
if (fp == 0)
return FALSE;
WriteFile(fp, &bfh, sizeof(BITMAPFILEHEADER), &dwSize, NULL);
WriteFile(fp, pDIB, (L_UINT) zDIBsize, &dwSize, NULL);
CloseHandle(fp);
GlobalUnlock(hDIB);
return TRUE;
}
L_INT ConvertToDIBExample(pBITMAPHANDLE pBitmap,L_TCHAR* pszFileName)
{
HGLOBAL hDIB;
hDIB = L_ConvertToDIB(pBitmap, DIB_BITMAPINFOHEADER);
MySaveFile(hDIB, pszFileName);
GlobalFree(hDIB);
return SUCCESS;
}
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