dlls/windowscodecs/main.c

   1 /*
   2  * Copyright 2009 Vincent Povirk for CodeWeavers
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19
  20 #include "config.h"
  21
  22 #include <stdarg.h>
  23
  24 #include "windef.h"
  25 #include "winbase.h"
  26 #include "objbase.h"
  27 #include "wincodec.h"
  28
  29 #include "wincodecs_private.h"
  30
  31 #include "wine/debug.h"
  32
  33 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
  34
  35 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
  36 {
  37
  38     switch (fdwReason)
  39     {
  40         case DLL_PROCESS_ATTACH:
  41             DisableThreadLibraryCalls(hinstDLL);
  42             break;
  43         case DLL_PROCESS_DETACH:
  44             break;
  45     }
  46
  47     return TRUE;
  48 }
  49
  50 HRESULT copy_pixels(UINT bpp, const BYTE *srcbuffer,
  51     UINT srcwidth, UINT srcheight, INT srcstride,
  52     const WICRect *rc, UINT dststride, UINT dstbuffersize, BYTE *dstbuffer)
  53 {
  54     UINT bytesperrow;
  55     UINT row_offset; /* number of bits into the source rows where the data starts */
  56
  57     if (rc->X < 0 || rc->Y < 0 || rc->X+rc->Width > srcwidth || rc->Y+rc->Height > srcheight)
  58         return E_INVALIDARG;
  59
  60     bytesperrow = ((bpp * rc->Width)+7)/8;
  61
  62     if (dststride < bytesperrow)
  63         return E_INVALIDARG;
  64
  65     if ((dststride * rc->Height) > dstbuffersize)
  66         return E_INVALIDARG;
  67
  68     row_offset = rc->X * bpp;
  69
  70     if (row_offset % 8 == 0)
  71     {
  72         /* everything lines up on a byte boundary */
  73         UINT row;
  74         const BYTE *src;
  75         BYTE *dst;
  76
  77         src = srcbuffer + (row_offset / 8) + srcstride * rc->Y;
  78         dst = dstbuffer;
  79         for (row=0; row < rc->Height; row++)
  80         {
  81             memcpy(dst, src, bytesperrow);
  82             src += srcstride;
  83             dst += dststride;
  84         }
  85         return S_OK;
  86     }
  87     else
  88     {
  89         /* we have to do a weird bitwise copy. eww. */
  90         FIXME("cannot reliably copy bitmap data if bpp < 8\n");
  91         return E_FAIL;
  92     }
  93 }