reactos/lib/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 "dibitmap.h"
  12
  13 DIBitmap *DibLoadImage(TCHAR *filename)
  14 {
  15     BOOL               bSuccess;
  16     DWORD              dwFileSize, dwHighSize, dwBytesRead;
  17     HANDLE             hFile;
  18     DIBitmap           *bitmap;
  19
  20     hFile = CreateFile(filename,
  21                        GENERIC_READ,
  22                        FILE_SHARE_READ,
  23                        NULL,
  24                        OPEN_EXISTING,
  25                        FILE_FLAG_SEQUENTIAL_SCAN,
  26                        NULL);
  27
  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     bitmap = malloc(sizeof(DIBitmap));
  40     if(!bitmap)
  41         return NULL;
  42
  43     bitmap->header = malloc(dwFileSize);
  44     if(!bitmap->header)
  45     {
  46         CloseHandle(hFile);
  47         return NULL;
  48     }
  49
  50     bSuccess = ReadFile(hFile, bitmap->header, dwFileSize, &dwBytesRead, NULL);
  51     CloseHandle(hFile);
  52
  53     if(!bSuccess || (dwBytesRead != dwFileSize)
  54                  || (bitmap->header->bfType != * (WORD *) "BM")
  55                  || (bitmap->header->bfSize != dwFileSize))
  56     {
  57         free(bitmap->header);
  58         return NULL;
  59     }
  60
  61     bitmap->info = (BITMAPINFO *)(bitmap->header + 1);
  62     bitmap->bits = (BYTE *)bitmap->header + bitmap->header->bfOffBits;
  63
  64     /* Get the DIB width and height */
  65     if(bitmap->info->bmiHeader.biSize == sizeof(BITMAPCOREHEADER))
  66     {
  67         bitmap->width  = ((BITMAPCOREHEADER *)bitmap->info)->bcWidth;
  68         bitmap->height = ((BITMAPCOREHEADER *)bitmap->info)->bcHeight;
  69     }
  70     else
  71     {
  72         bitmap->width   =     bitmap->info->bmiHeader.biWidth;
  73         bitmap->height  = abs(bitmap->info->bmiHeader.biHeight);
  74     }
  75
  76     return bitmap;
  77 }
  78
  79 void DibFreeImage(DIBitmap *bitmap)
  80 {
  81     if(bitmap == NULL)
  82         return;
  83
  84     /* Free the header */
  85     if(bitmap->header != NULL)
  86         free(bitmap->header);
  87
  88     /* Free the bitmap structure */
  89     if(bitmap != NULL)
  90         free(bitmap);
  91 }
  92