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Annotation of mstools/samples/plgblt/bitmap.c, revision 1.1

1.1     ! root        1: /**************************************************************************\
        !             2: *  bitmap.c -- support for reading in and drawing bitmaps.
        !             3: *
        !             4: \**************************************************************************/
        !             5: 
        !             6: #include <windows.h>
        !             7: #include <commdlg.h>
        !             8: 
        !             9: 
        !            10: 
        !            11: /**************************************************************************\
        !            12: *
        !            13: *  function:  DrawBitmap()
        !            14: *
        !            15: *  input parameters:  HDC, HBITMAP
        !            16: *
        !            17: *  Draw the bitmap into the hdc.  Source rectangle computed to include the
        !            18: *   whole bitmap.  Destination location is 0,0.
        !            19: *
        !            20: *  global variables: none.
        !            21: *
        !            22: \**************************************************************************/
        !            23: VOID DrawBitmap (HDC hdc, HBITMAP hbm)
        !            24: {
        !            25:     BOOL f;
        !            26:     HDC hdcBits;
        !            27:     BITMAP bm;
        !            28: 
        !            29:     hdcBits = CreateCompatibleDC(hdc);
        !            30:     GetObject (hbm, sizeof(BITMAP), &bm);
        !            31:     SelectObject(hdcBits,hbm);
        !            32:     f = BitBlt(hdc,0,0,bm.bmWidth, bm.bmHeight,hdcBits,0,0,SRCCOPY);
        !            33:     DeleteDC(hdcBits);
        !            34: }
        !            35: 
        !            36: 
        !            37: 
        !            38: /**************************************************************************\
        !            39: *
        !            40: *  function:  GetBitmap()
        !            41: *
        !            42: *  input parameters:
        !            43: *   hdc - hdc to make the bitmap compatible with.
        !            44: *   hInst - instance handle
        !            45: *
        !            46: *  Put up a common dialog box to open a new *.BMP file.
        !            47: *   Once this is complete, open the file, read in the information,
        !            48: *   and create a compatible bitmap.
        !            49: *
        !            50: *  returns:  handle to the bitmap iff successful.  NULL otherwise.
        !            51: *
        !            52: \**************************************************************************/
        !            53: HBITMAP GetBitmap (HDC hdc, HANDLE hInst, BOOL monochrome)
        !            54: {
        !            55:     HBITMAP hbm;
        !            56:     PBITMAPFILEHEADER pbmfh;
        !            57:     PBITMAPINFOHEADER pbmih;
        !            58:     PBYTE             pBits;
        !            59:     int fh;
        !            60:     int bfOffBits;
        !            61:     int nbytes;
        !            62:     OPENFILENAME  of;
        !            63:     char buffer [MAX_PATH];
        !            64: 
        !            65:     buffer[0] = 0;
        !            66: 
        !            67:     /* set up the OPENFILE structure,
        !            68:      *  then use the appropriate common dialog
        !            69:      */
        !            70:     of.lStructSize       = sizeof (OPENFILENAME);
        !            71:     of.hwndOwner         = NULL;
        !            72:     of.hInstance         = hInst;
        !            73:     of.lpstrFilter       = "Bitmaps\000 *.BMP\000\000";
        !            74:     of.lpstrCustomFilter = NULL;
        !            75:     of.nMaxCustFilter    = NULL;
        !            76:     of.nFilterIndex      = NULL;
        !            77:     of.lpstrFile         = buffer;
        !            78:     of.nMaxFile          = MAX_PATH;
        !            79:     of.lpstrFileTitle    = NULL;
        !            80:     of.nMaxFileTitle     = NULL;
        !            81:     of.lpstrInitialDir   = "c:\\nt\\windows";
        !            82:     of.lpstrTitle        = NULL;
        !            83:     of.Flags             = OFN_READONLY;
        !            84:     of.nFileOffset       = NULL;
        !            85:     of.nFileExtension    = NULL;
        !            86:     of.lpstrDefExt       = NULL;
        !            87:     of.lCustData         = NULL;
        !            88:     of.lpfnHook          = NULL;
        !            89:     of.lpTemplateName    = NULL;
        !            90:     if (!GetOpenFileName (&of)) return NULL;
        !            91: 
        !            92:     /* Try to open the file.  If successful, then allocate space for it,
        !            93:      *  and read in all of the bytes.
        !            94:      */
        !            95:     fh = _lopen (buffer, OF_READ);
        !            96:     if (fh == -1) return NULL;
        !            97:     nbytes = GetFileSize ((HANDLE) fh, NULL);
        !            98: 
        !            99:     /* The contents of the file are read in here in three parts.  First
        !           100:      *  the bitmap file header is read, then the bitmap header along with
        !           101:      *  the color table, then finally the actual bit data.  I.e. from
        !           102:      *  a total of nbytes...
        !           103:      *    1.  sizeof (BITMAPFILEHEADER)
        !           104:      *    2.  bfOffBits- sizeof (BITMAPFILEHEADER)
        !           105:      *    3.  (nbytes - bfOffBits)
        !           106:      */
        !           107: 
        !           108:     /* read in the bitmap file header.  save the offset to bits. */
        !           109:     if (!(pbmfh = (PBITMAPFILEHEADER)LocalAlloc (LPTR, sizeof (BITMAPFILEHEADER))))
        !           110:         return NULL;
        !           111:     _lread (fh, (LPSTR)pbmfh, sizeof (BITMAPFILEHEADER));
        !           112:     bfOffBits=pbmfh->bfOffBits;
        !           113: 
        !           114:     /* read in the bitmap info header and the color table right after it.
        !           115:      * both BITMAPINFOHEADER and BITMAPINFO needed for CreateDIBitmap()
        !           116:      */
        !           117:     if (!(pbmih = (PBITMAPINFOHEADER)LocalAlloc (LPTR, bfOffBits- sizeof (BITMAPFILEHEADER))))
        !           118:         return NULL;
        !           119:     _lread (fh, (LPSTR)pbmih, bfOffBits- sizeof (BITMAPFILEHEADER));
        !           120: 
        !           121:     /* finally read in the bit data. */
        !           122:     if (!(pBits = (PBYTE)LocalAlloc (LPTR, (nbytes - bfOffBits)))) return NULL;
        !           123:     _lread (fh, (LPSTR)pBits, (nbytes - bfOffBits));
        !           124: 
        !           125: 
        !           126:     /* in the case of desiring a monochrome bitmap (input parameter),
        !           127:      *  verify that is what we got.
        !           128:      */
        !           129:     if (monochrome && ( pbmih->biBitCount != 1)) {
        !           130:         MessageBox (NULL, "Mask must be monochrome bitmap.",
        !           131:                     "Error", MB_APPLMODAL | MB_ICONSTOP | MB_OK);
        !           132:         hbm = NULL;
        !           133:     } else
        !           134: 
        !           135: 
        !           136:     hbm = CreateDIBitmap (hdc, pbmih, CBM_INIT,
        !           137:                           pBits, (PBITMAPINFO) pbmih, DIB_RGB_COLORS);
        !           138: 
        !           139:     LocalFree (LocalHandle ((LPSTR)pBits));
        !           140:     LocalFree (LocalHandle ((LPSTR)pbmih));
        !           141:     LocalFree (LocalHandle ((LPSTR)pbmfh));
        !           142:     _lclose (fh);
        !           143: 
        !           144:     return hbm;
        !           145: }

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