dll/cpl/desk/dibitmap.c

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS Display Control Panel
   4  * FILE:            dll/cpl/desk/dibitmap.c
   5  * PURPOSE:         DIB loading
   6  *
   7  * PROGRAMMERS:     Trevor McCort (lycan359@gmail.com)
   8  */
   9
  10 #include "desk.h"
  11
  12 PDIBITMAP
  13 DibLoadImage(LPTSTR lpFilename)
  14 {
  15     BOOL     bSuccess;
  16     DWORD    dwFileSize, dwHighSize, dwBytesRead;
  17     HANDLE   hFile;
  18     PDIBITMAP lpBitmap;
  19
  20     hFile = CreateFile(lpFilename,
  21                        GENERIC_READ,
  22                        FILE_SHARE_READ,
  23                        NULL,
  24                        OPEN_EXISTING,
  25                        FILE_FLAG_SEQUENTIAL_SCAN,
  26                        NULL);
  27     if (hFile == INVALID_HANDLE_VALUE)
  28         return NULL;
  29
  30     dwFileSize = GetFileSize(hFile, &dwHighSize);
  31
  32     if (dwHighSize)
  33     {
  34         CloseHandle(hFile);
  35         return NULL;
  36     }
  37
  38     lpBitmap = HeapAlloc(GetProcessHeap(), 0, sizeof(DIBITMAP));
  39     if (lpBitmap == NULL)
  40     {
  41         CloseHandle(hFile);
  42         return NULL;
  43     }
  44
  45     lpBitmap->header = HeapAlloc(GetProcessHeap(), 0, dwFileSize);
  46     if (lpBitmap->header == NULL)
  47     {
  48         HeapFree(GetProcessHeap(), 0, lpBitmap);
  49         CloseHandle(hFile);
  50         return NULL;
  51     }
  52
  53     bSuccess = ReadFile(hFile, lpBitmap->header, dwFileSize, &dwBytesRead, NULL);
  54     CloseHandle(hFile);
  55
  56     if (!bSuccess ||
  57         (dwBytesRead != dwFileSize) ||
  58         (lpBitmap->header->bfType != * (WORD *) "BM") ||
  59         (lpBitmap->header->bfSize != dwFileSize))
  60     {
  61         HeapFree(GetProcessHeap(), 0, lpBitmap->header);
  62         HeapFree(GetProcessHeap(), 0, lpBitmap);
  63         return NULL;
  64     }
  65
  66     lpBitmap->info = (BITMAPINFO *)(lpBitmap->header + 1);
  67     lpBitmap->bits = (BYTE *)lpBitmap->header + lpBitmap->header->bfOffBits;
  68
  69     /* Get the DIB width and height */
  70     if (lpBitmap->info->bmiHeader.biSize == sizeof(BITMAPCOREHEADER))
  71     {
  72         lpBitmap->width  = ((BITMAPCOREHEADER *)lpBitmap->info)->bcWidth;
  73         lpBitmap->height = ((BITMAPCOREHEADER *)lpBitmap->info)->bcHeight;
  74     }
  75     else
  76     {
  77         lpBitmap->width   =     lpBitmap->info->bmiHeader.biWidth;
  78         lpBitmap->height  = abs(lpBitmap->info->bmiHeader.biHeight);
  79     }
  80
  81     return lpBitmap;
  82 }
  83
  84
  85 VOID
  86 DibFreeImage(PDIBITMAP lpBitmap)
  87 {
  88     if (lpBitmap == NULL)
  89         return;
  90
  91     /* Free the header */
  92     if (lpBitmap->header != NULL)
  93         HeapFree(GetProcessHeap(), 0, lpBitmap->header);
  94
  95     /* Free the bitmap structure */
  96     if (lpBitmap != NULL)
  97         HeapFree(GetProcessHeap(), 0, lpBitmap);
  98 }