reactos/dll/cpl/desk/dibitmap.c

   1 /* $Id: dibitmap.c 54535 2011-11-29 14:55:58Z dgorbachev $
   2  *
   3  * COPYRIGHT:       See COPYING in the top level directory
   4  * PROJECT:         ReactOS Display Control Panel
   5  * FILE:            dll/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     {
  42         CloseHandle(hFile);
  43         return NULL;
  44     }
  45
  46     lpBitmap->header = HeapAlloc(GetProcessHeap(), 0, dwFileSize);
  47     if (lpBitmap->header == NULL)
  48     {
  49         HeapFree(GetProcessHeap(), 0, lpBitmap);
  50         CloseHandle(hFile);
  51         return NULL;
  52     }
  53
  54     bSuccess = ReadFile(hFile, lpBitmap->header, dwFileSize, &dwBytesRead, NULL);
  55     CloseHandle(hFile);
  56
  57     if (!bSuccess ||
  58         (dwBytesRead != dwFileSize) ||
  59         (lpBitmap->header->bfType != * (WORD *) "BM") ||
  60         (lpBitmap->header->bfSize != dwFileSize))
  61     {
  62         HeapFree(GetProcessHeap(), 0, lpBitmap->header);
  63         HeapFree(GetProcessHeap(), 0, lpBitmap);
  64         return NULL;
  65     }
  66
  67     lpBitmap->info = (BITMAPINFO *)(lpBitmap->header + 1);
  68     lpBitmap->bits = (BYTE *)lpBitmap->header + lpBitmap->header->bfOffBits;
  69
  70     /* Get the DIB width and height */
  71     if (lpBitmap->info->bmiHeader.biSize == sizeof(BITMAPCOREHEADER))
  72     {
  73         lpBitmap->width  = ((BITMAPCOREHEADER *)lpBitmap->info)->bcWidth;
  74         lpBitmap->height = ((BITMAPCOREHEADER *)lpBitmap->info)->bcHeight;
  75     }
  76     else
  77     {
  78         lpBitmap->width   =     lpBitmap->info->bmiHeader.biWidth;
  79         lpBitmap->height  = abs(lpBitmap->info->bmiHeader.biHeight);
  80     }
  81
  82     return lpBitmap;
  83 }
  84
  85
  86 VOID
  87 DibFreeImage(PDIBITMAP lpBitmap)
  88 {
  89     if (lpBitmap == NULL)
  90         return;
  91
  92     /* Free the header */
  93     if (lpBitmap->header != NULL)
  94         HeapFree(GetProcessHeap(), 0, lpBitmap->header);
  95
  96     /* Free the bitmap structure */
  97     if (lpBitmap != NULL)
  98         HeapFree(GetProcessHeap(), 0, lpBitmap);
  99 }