- int bits;
- BITMAPINFOHEADER *lpbi;
- BITMAPCOREHEADER *lpbc;
-
- lpbi = ((BITMAPINFOHEADER*) pv);
- lpbc = ((BITMAPCOREHEADER*) pv);
-
- /* With the BITMAPINFO format headers, the size of the palette
- * is in biClrUsed, whereas in the BITMAPCORE - style headers, it
- * is dependent on the bits per pixel ( = 2 raised to the power of
- * bits/pixel).
- */
- if (lpbi->biSize != sizeof(BITMAPCOREHEADER)) {
- if (lpbi->biClrUsed != 0)
- return (WORD) lpbi->biClrUsed;
- bits = lpbi->biBitCount;
- }
- else
- bits = lpbc->bcBitCount;
-
- switch (bits) {
- case 1:
- return 2;
- case 4:
- return 16;
- case 8:
- return 256;
- default:
- /* A 24 bitcount DIB has no color table */
- return 0;
- }
-}
-
-/*
- * FUNCTION : lread(int fh, VOID FAR *pv, DWORD ul)
- * PURPOSE : Reads data in steps of 32k till all the data has been read.
- * RETURNS : 0 - If read did not proceed correctly.
- * number of bytes read otherwise.
- */
-
-static DWORD lread(int fh, void far *pv, DWORD ul)
-{
- DWORD ulT = ul;
-#if defined(WINNT) || defined(__WIN32__) || defined(__WIN32__)
- BYTE *hp = (BYTE *) pv;
-#else
- BYTE huge *hp = (BYTE huge *) pv;
-#endif
- while (ul > (DWORD) MAXREAD) {
- if (_lread(fh, (LPSTR) hp, (WORD) MAXREAD) != MAXREAD)
- return 0;
- ul -= MAXREAD;
- hp += MAXREAD;
- }
- if (_lread(fh, (LPSTR) hp, (WXUINT) ul) != (WXUINT) ul)
- return 0;
- return ulT;
-}
-
-/*
- * FUNCTION : lwrite(int fh, VOID FAR *pv, DWORD ul)
- * PURPOSE : Writes data in steps of 32k till all the data is written.
- * RETURNS : 0 - If write did not proceed correctly.
- * number of bytes written otherwise.
- */
-
-static DWORD lwrite(int fh, VOID FAR *pv, DWORD ul)
-{
- DWORD ulT = ul;
-#if defined(WINNT) || defined(__WIN32__) || defined(__WIN32__)
- BYTE *hp = (BYTE *) pv;
-#else
- BYTE huge *hp = (BYTE huge *) pv;
-#endif
- while (ul > MAXREAD) {
- if (_lwrite(fh, (LPSTR) hp, (WORD) MAXREAD) != MAXREAD)
- return 0;
- ul -= MAXREAD;
- hp += MAXREAD;
- }
- if (_lwrite(fh, (LPSTR) hp, (WXUINT) ul) != (WXUINT) ul)
- return 0;
- return ulT;
-}
-
-/*
- * FUNCTION : wxReadDIB(hWnd)
- * PURPOSE : Reads a DIB from a file, obtains a handle to its
- * BITMAPINFO struct. and loads the DIB. Once the DIB
- * is loaded, the function also creates a bitmap and
- * palette out of the DIB for a device-dependent form.
- * RETURNS : TRUE - DIB loaded and bitmap/palette created
- * The DIBINIT structure pointed to by pInfo is
- * filled with the appropriate handles.
- * FALSE - otherwise
- */
-
-bool wxReadDIB(LPTSTR lpFileName, HBITMAP *bitmap, HPALETTE *palette)
-{
- int fh;
- LPBITMAPINFOHEADER lpbi;
- OFSTRUCT of;
- BITMAPFILEHEADER bf;
- WORD nNumColors;
- bool result = FALSE;
- WORD offBits;
- HDC hDC;
- bool bCoreHead = FALSE;
- HANDLE hDIB = 0;
-
- /* Open the file and get a handle to it's BITMAPINFO */
-
- fh = OpenFile (wxConvertWX2MB(lpFileName), &of, OF_READ);
- if (fh == -1) {
- wxLogError(_("Can't open file '%s'"), lpFileName);
- return (0);
- }
-
- hDIB = GlobalAlloc(GHND, (DWORD)(sizeof(BITMAPINFOHEADER) +
- 256 * sizeof(RGBQUAD)));
- if (!hDIB)
- return(0);
-
- lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
-
- /* read the BITMAPFILEHEADER */
- if (sizeof (bf) != _lread (fh, (LPSTR)&bf, sizeof (bf)))
- goto ErrExit;
-
- if (bf.bfType != 0x4d42) /* 'BM' */
- goto ErrExit;
-
- if (sizeof(BITMAPCOREHEADER) != _lread (fh, (LPSTR)lpbi, sizeof(BITMAPCOREHEADER)))
- goto ErrExit;
-
- if (lpbi->biSize == sizeof(BITMAPCOREHEADER))
- {
- lpbi->biSize = sizeof(BITMAPINFOHEADER);
- lpbi->biBitCount = ((LPBITMAPCOREHEADER)lpbi)->bcBitCount;
- lpbi->biPlanes = ((LPBITMAPCOREHEADER)lpbi)->bcPlanes;
- lpbi->biHeight = ((LPBITMAPCOREHEADER)lpbi)->bcHeight;
- lpbi->biWidth = ((LPBITMAPCOREHEADER)lpbi)->bcWidth;
- bCoreHead = TRUE;
- }
- else
- {
- // get to the start of the header and read INFOHEADER
- _llseek(fh,sizeof(BITMAPFILEHEADER),SEEK_SET);
- if (sizeof(BITMAPINFOHEADER) != _lread (fh, (LPSTR)lpbi, sizeof(BITMAPINFOHEADER)))
- goto ErrExit;
- }
-
- nNumColors = (WORD)lpbi->biClrUsed;
- if ( nNumColors == 0 )
- {
- /* no color table for 24-bit, default size otherwise */
- if (lpbi->biBitCount != 24)
- nNumColors = 1 << lpbi->biBitCount; /* standard size table */
- }
-
- /* fill in some default values if they are zero */
- if (lpbi->biClrUsed == 0)
- lpbi->biClrUsed = nNumColors;
-
- if (lpbi->biSizeImage == 0)
- {
- lpbi->biSizeImage = ((((lpbi->biWidth * (DWORD)lpbi->biBitCount) + 31) & ~31) >> 3)
- * lpbi->biHeight;
- }
-
- /* get a proper-sized buffer for header, color table and bits */
- GlobalUnlock(hDIB);
- hDIB = GlobalReAlloc(hDIB, lpbi->biSize +
- nNumColors * sizeof(RGBQUAD) +
- lpbi->biSizeImage, 0);
- if (!hDIB) /* can't resize buffer for loading */
- goto ErrExit2;
-
- lpbi = (LPBITMAPINFOHEADER)GlobalLock(hDIB);
-
- /* read the color table */
- if (!bCoreHead)
- _lread(fh, (LPSTR)(lpbi) + lpbi->biSize, nNumColors * sizeof(RGBQUAD));
- else
projects / wxWidgets.git / blobdiff