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