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     PDIBITMAP lpBitmap;
  16     GpBitmap  *bitmap;
  17     BitmapData lock;
  18
  19     if (GdipCreateBitmapFromFile(lpFilename, &bitmap) != Ok)
  20     {
  21         return NULL;
  22     }
  23
  24     lpBitmap = HeapAlloc(GetProcessHeap(), 0, sizeof(DIBITMAP));
  25     if (lpBitmap == NULL)
  26     {
  27         GdipDisposeImage((GpImage*)bitmap);
  28         return NULL;
  29     }
  30
  31     lpBitmap->info = HeapAlloc(GetProcessHeap(), 0, sizeof(BITMAPINFO));
  32     if (lpBitmap->info == NULL)
  33     {
  34         HeapFree(GetProcessHeap(), 0, lpBitmap);
  35         GdipDisposeImage((GpImage*)bitmap);
  36         return NULL;
  37     }
  38
  39     if (GdipGetImageWidth((GpImage*)bitmap, &lpBitmap->width) != Ok ||
  40         GdipGetImageHeight((GpImage*)bitmap, &lpBitmap->height) != Ok)
  41     {
  42         HeapFree(GetProcessHeap(), 0, lpBitmap->info);
  43         HeapFree(GetProcessHeap(), 0, lpBitmap);
  44         GdipDisposeImage((GpImage*)bitmap);
  45         return NULL;
  46     }
  47
  48     lpBitmap->bits = HeapAlloc(GetProcessHeap(), 0, lpBitmap->width * lpBitmap->height * 4);
  49     if (!lpBitmap->bits)
  50     {
  51         HeapFree(GetProcessHeap(), 0, lpBitmap->info);
  52         HeapFree(GetProcessHeap(), 0, lpBitmap);
  53         GdipDisposeImage((GpImage*)bitmap);
  54         return NULL;
  55     }
  56
  57     ZeroMemory(lpBitmap->info, sizeof(BITMAPINFO));
  58     lpBitmap->info->bmiHeader.biSize        = sizeof(BITMAPINFOHEADER);
  59     lpBitmap->info->bmiHeader.biWidth       = lpBitmap->width;
  60     lpBitmap->info->bmiHeader.biHeight      = -(INT)lpBitmap->height;
  61     lpBitmap->info->bmiHeader.biPlanes      = 1;
  62     lpBitmap->info->bmiHeader.biBitCount    = 32;
  63     lpBitmap->info->bmiHeader.biCompression = BI_RGB;
  64     lpBitmap->info->bmiHeader.biSizeImage   = lpBitmap->width * lpBitmap->height * 4;
  65
  66     lock.Width = lpBitmap->width;
  67     lock.Height = lpBitmap->height;
  68     lock.Stride = lpBitmap->width * 4;
  69     lock.PixelFormat = PixelFormat32bppPARGB;
  70     lock.Scan0  = lpBitmap->bits;
  71     lock.Reserved = 0;
  72
  73     if (GdipBitmapLockBits(bitmap, NULL, ImageLockModeRead | ImageLockModeUserInputBuf, PixelFormat32bppPARGB, &lock) != Ok)
  74     {
  75         HeapFree(GetProcessHeap(), 0, lpBitmap->bits);
  76         HeapFree(GetProcessHeap(), 0, lpBitmap->info);
  77         HeapFree(GetProcessHeap(), 0, lpBitmap);
  78         GdipDisposeImage((GpImage*)bitmap);
  79         return NULL;
  80     }
  81
  82     GdipBitmapUnlockBits(bitmap, &lock);
  83     GdipDisposeImage((GpImage*)bitmap);
  84
  85     return lpBitmap;
  86 }
  87
  88
  89 VOID
  90 DibFreeImage(PDIBITMAP lpBitmap)
  91 {
  92     if (lpBitmap == NULL)
  93         return;
  94
  95     /* Free the image data */
  96     if (lpBitmap->bits != NULL)
  97         HeapFree(GetProcessHeap(), 0, lpBitmap->bits);
  98
  99     /* Free the bitmap info */
 100     if (lpBitmap->info != NULL)
 101         HeapFree(GetProcessHeap(), 0, lpBitmap->info);
 102
 103     /* Free the bitmap structure */
 104     if (lpBitmap != NULL)
 105         HeapFree(GetProcessHeap(), 0, lpBitmap);
 106 }