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 #define COBJMACROS
  21 #include "config.h"
  22
  23 #include <stdarg.h>
  24
  25 #include "windef.h"
  26 #include "winbase.h"
  27 #include "objbase.h"
  28 #include "wincodec.h"
  29
  30 #include "wincodecs_private.h"
  31
  32 #include "wine/debug.h"
  33
  34 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
  35
  36 extern BOOL WINAPI WIC_DllMain(HINSTANCE, DWORD, LPVOID) DECLSPEC_HIDDEN;
  37
  38 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
  39 {
  40
  41     switch (fdwReason)
  42     {
  43         case DLL_PROCESS_ATTACH:
  44             DisableThreadLibraryCalls(hinstDLL);
  45             break;
  46     }
  47
  48     return WIC_DllMain(hinstDLL, fdwReason, lpvReserved);
  49 }
  50
  51 HRESULT WINAPI DllCanUnloadNow(void)
  52 {
  53     return S_FALSE;
  54 }
  55
  56 HRESULT copy_pixels(UINT bpp, const BYTE *srcbuffer,
  57     UINT srcwidth, UINT srcheight, INT srcstride,
  58     const WICRect *rc, UINT dststride, UINT dstbuffersize, BYTE *dstbuffer)
  59 {
  60     UINT bytesperrow;
  61     UINT row_offset; /* number of bits into the source rows where the data starts */
  62     WICRect rect;
  63
  64     if (!rc)
  65     {
  66         rect.X = 0;
  67         rect.Y = 0;
  68         rect.Width = srcwidth;
  69         rect.Height = srcheight;
  70         rc = &rect;
  71     }
  72     else
  73     {
  74         if (rc->X < 0 || rc->Y < 0 || rc->X+rc->Width > srcwidth || rc->Y+rc->Height > srcheight)
  75             return E_INVALIDARG;
  76     }
  77
  78     bytesperrow = ((bpp * rc->Width)+7)/8;
  79
  80     if (dststride < bytesperrow)
  81         return E_INVALIDARG;
  82
  83     if ((dststride * (rc->Height-1)) + ((rc->Width * bpp) + 7)/8 > dstbuffersize)
  84         return E_INVALIDARG;
  85
  86     /* if the whole bitmap is copied and the buffer format matches then it's a matter of a single memcpy */
  87     if (rc->X == 0 && rc->Y == 0 && rc->Width == srcwidth && rc->Height == srcheight &&
  88         srcstride == dststride && srcstride == bytesperrow)
  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         INT 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 }
 139
 140 HRESULT get_pixelformat_bpp(const GUID *pixelformat, UINT *bpp)
 141 {
 142     HRESULT hr;
 143     IWICComponentInfo *info;
 144     IWICPixelFormatInfo *formatinfo;
 145
 146     hr = CreateComponentInfo(pixelformat, &info);
 147     if (SUCCEEDED(hr))
 148     {
 149         hr = IWICComponentInfo_QueryInterface(info, &IID_IWICPixelFormatInfo, (void**)&formatinfo);
 150
 151         if (SUCCEEDED(hr))
 152         {
 153             hr = IWICPixelFormatInfo_GetBitsPerPixel(formatinfo, bpp);
 154
 155             IWICPixelFormatInfo_Release(formatinfo);
 156         }
 157
 158         IWICComponentInfo_Release(info);
 159     }
 160
 161     return hr;
 162 }