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 extern BOOL WINAPI WIC_DllMain(HINSTANCE, DWORD, LPVOID) DECLSPEC_HIDDEN;
  36
  37 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
  38 {
  39
  40     switch (fdwReason)
  41     {
  42         case DLL_PROCESS_ATTACH:
  43             DisableThreadLibraryCalls(hinstDLL);
  44             break;
  45         case DLL_PROCESS_DETACH:
  46             break;
  47     }
  48
  49     return WIC_DllMain(hinstDLL, fdwReason, lpvReserved);
  50 }
  51
  52 HRESULT WINAPI DllCanUnloadNow(void)
  53 {
  54     return S_FALSE;
  55 }
  56
  57 HRESULT copy_pixels(UINT bpp, const BYTE *srcbuffer,
  58     UINT srcwidth, UINT srcheight, INT srcstride,
  59     const WICRect *rc, UINT dststride, UINT dstbuffersize, BYTE *dstbuffer)
  60 {
  61     UINT bytesperrow;
  62     UINT row_offset; /* number of bits into the source rows where the data starts */
  63     WICRect rect;
  64
  65     if (!rc)
  66     {
  67         rect.X = 0;
  68         rect.Y = 0;
  69         rect.Width = srcwidth;
  70         rect.Height = srcheight;
  71         rc = &rect;
  72     }
  73     else
  74     {
  75         if (rc->X < 0 || rc->Y < 0 || rc->X+rc->Width > srcwidth || rc->Y+rc->Height > srcheight)
  76             return E_INVALIDARG;
  77     }
  78
  79     bytesperrow = ((bpp * rc->Width)+7)/8;
  80
  81     if (dststride < bytesperrow)
  82         return E_INVALIDARG;
  83
  84     if ((dststride * rc->Height) > dstbuffersize)
  85         return E_INVALIDARG;
  86
  87     /* if the whole bitmap is copied and the buffer format matches then it's a matter of a single memcpy */
  88     if (rc->X == 0 && rc->Y == 0 && rc->Width == srcwidth && rc->Height == srcheight && srcstride == dststride)
  89     {
  90         memcpy(dstbuffer, srcbuffer, srcstride * srcheight);
  91         return S_OK;
  92     }
  93
  94     row_offset = rc->X * bpp;
  95
  96     if (row_offset % 8 == 0)
  97     {
  98         /* everything lines up on a byte boundary */
  99         UINT row;
 100         const BYTE *src;
 101         BYTE *dst;
 102
 103         src = srcbuffer + (row_offset / 8) + srcstride * rc->Y;
 104         dst = dstbuffer;
 105         for (row=0; row < rc->Height; row++)
 106         {
 107             memcpy(dst, src, bytesperrow);
 108             src += srcstride;
 109             dst += dststride;
 110         }
 111         return S_OK;
 112     }
 113     else
 114     {
 115         /* we have to do a weird bitwise copy. eww. */
 116         FIXME("cannot reliably copy bitmap data if bpp < 8\n");
 117         return E_FAIL;
 118     }
 119 }
 120
 121 void reverse_bgr8(UINT bytesperpixel, LPBYTE bits, UINT width, UINT height, INT stride)
 122 {
 123     UINT x, y;
 124     BYTE *pixel, temp;
 125
 126     for (y=0; y<height; y++)
 127     {
 128         pixel = bits + stride * y;
 129
 130         for (x=0; x<width; x++)
 131         {
 132             temp = pixel[2];
 133             pixel[2] = pixel[0];
 134             pixel[0] = temp;
 135             pixel += bytesperpixel;
 136         }
 137     }
 138 }