reactos/dll/cpl/desk/dibitmap.c

   1 /* $Id$
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS Display Control Panel
   5  * FILE:            lib/cpl/desk/dibitmap.c
   6  * PURPOSE:         DIB loading
   7  *
   8  * PROGRAMMERS:     Trevor McCort (lycan359@gmail.com)
   9  */
  10
  11 #include "desk.h"
  12
  13 PDIBITMAP
  14 DibLoadImage(LPTSTR lpFilename)
  15 {
  16     BOOL     bSuccess;
  17     DWORD    dwFileSize, dwHighSize, dwBytesRead;
  18     HANDLE   hFile;
  19     PDIBITMAP lpBitmap;
  20
  21     hFile = CreateFile(lpFilename,
  22                        GENERIC_READ,
  23                        FILE_SHARE_READ,
  24                        NULL,
  25                        OPEN_EXISTING,
  26                        FILE_FLAG_SEQUENTIAL_SCAN,
  27                        NULL);
  28     if (hFile == INVALID_HANDLE_VALUE)
  29         return NULL;
  30
  31     dwFileSize = GetFileSize(hFile, &dwHighSize);
  32
  33     if (dwHighSize)
  34     {
  35         CloseHandle(hFile);
  36         return NULL;
  37     }
  38
  39     lpBitmap = HeapAlloc(GetProcessHeap(), 0, sizeof(DIBITMAP));
  40     if (lpBitmap == NULL)
  41         return NULL;
  42
  43     lpBitmap->header = HeapAlloc(GetProcessHeap(), 0, dwFileSize);
  44     if (lpBitmap->header == NULL)
  45     {
  46         CloseHandle(hFile);
  47         return NULL;
  48     }
  49
  50     bSuccess = ReadFile(hFile, lpBitmap->header, dwFileSize, &dwBytesRead, NULL);
  51     CloseHandle(hFile);
  52
  53     if (!bSuccess ||
  54         (dwBytesRead != dwFileSize) ||
  55         (lpBitmap->header->bfType != * (WORD *) "BM") ||
  56         (lpBitmap->header->bfSize != dwFileSize))
  57     {
  58         HeapFree(GetProcessHeap(), 0, lpBitmap->header);
  59         return NULL;
  60     }
  61
  62     lpBitmap->info = (BITMAPINFO *)(lpBitmap->header + 1);
  63     lpBitmap->bits = (BYTE *)lpBitmap->header + lpBitmap->header->bfOffBits;
  64
  65     /* Get the DIB width and height */
  66     if (lpBitmap->info->bmiHeader.biSize == sizeof(BITMAPCOREHEADER))
  67     {
  68         lpBitmap->width  = ((BITMAPCOREHEADER *)lpBitmap->info)->bcWidth;
  69         lpBitmap->height = ((BITMAPCOREHEADER *)lpBitmap->info)->bcHeight;
  70     }
  71     else
  72     {
  73         lpBitmap->width   =     lpBitmap->info->bmiHeader.biWidth;
  74         lpBitmap->height  = abs(lpBitmap->info->bmiHeader.biHeight);
  75     }
  76
  77     return lpBitmap;
  78 }
  79
  80
  81 VOID
  82 DibFreeImage(PDIBITMAP lpBitmap)
  83 {
  84     if (lpBitmap == NULL)
  85         return;
  86
  87     /* Free the header */
  88     if (lpBitmap->header != NULL)
  89         HeapFree(GetProcessHeap(), 0, lpBitmap->header);
  90
  91     /* Free the bitmap structure */
  92     if (lpBitmap != NULL)
  93         HeapFree(GetProcessHeap(), 0, lpBitmap);
  94 }