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         case DLL_PROCESS_DETACH:
  47             break;
  48     }
  49
  50     return WIC_DllMain(hinstDLL, fdwReason, lpvReserved);
  51 }
  52
  53 HRESULT WINAPI DllCanUnloadNow(void)
  54 {
  55     return S_FALSE;
  56 }
  57
  58 HRESULT copy_pixels(UINT bpp, const BYTE *srcbuffer,
  59     UINT srcwidth, UINT srcheight, INT srcstride,
  60     const WICRect *rc, UINT dststride, UINT dstbuffersize, BYTE *dstbuffer)
  61 {
  62     UINT bytesperrow;
  63     UINT row_offset; /* number of bits into the source rows where the data starts */
  64     WICRect rect;
  65
  66     if (!rc)
  67     {
  68         rect.X = 0;
  69         rect.Y = 0;
  70         rect.Width = srcwidth;
  71         rect.Height = srcheight;
  72         rc = &rect;
  73     }
  74     else
  75     {
  76         if (rc->X < 0 || rc->Y < 0 || rc->X+rc->Width > srcwidth || rc->Y+rc->Height > srcheight)
  77             return E_INVALIDARG;
  78     }
  79
  80     bytesperrow = ((bpp * rc->Width)+7)/8;
  81
  82     if (dststride < bytesperrow)
  83         return E_INVALIDARG;
  84
  85     if ((dststride * rc->Height) > dstbuffersize)
  86         return E_INVALIDARG;
  87
  88     /* if the whole bitmap is copied and the buffer format matches then it's a matter of a single memcpy */
  89     if (rc->X == 0 && rc->Y == 0 && rc->Width == srcwidth && rc->Height == srcheight && srcstride == dststride)
  90     {
  91         memcpy(dstbuffer, srcbuffer, srcstride * srcheight);
  92         return S_OK;
  93     }
  94
  95     row_offset = rc->X * bpp;
  96
  97     if (row_offset % 8 == 0)
  98     {
  99         /* everything lines up on a byte boundary */
 100         UINT row;
 101         const BYTE *src;
 102         BYTE *dst;
 103
 104         src = srcbuffer + (row_offset / 8) + srcstride * rc->Y;
 105         dst = dstbuffer;
 106         for (row=0; row < rc->Height; row++)
 107         {
 108             memcpy(dst, src, bytesperrow);
 109             src += srcstride;
 110             dst += dststride;
 111         }
 112         return S_OK;
 113     }
 114     else
 115     {
 116         /* we have to do a weird bitwise copy. eww. */
 117         FIXME("cannot reliably copy bitmap data if bpp < 8\n");
 118         return E_FAIL;
 119     }
 120 }
 121
 122 void reverse_bgr8(UINT bytesperpixel, LPBYTE bits, UINT width, UINT height, INT stride)
 123 {
 124     UINT x, y;
 125     BYTE *pixel, temp;
 126
 127     for (y=0; y<height; y++)
 128     {
 129         pixel = bits + stride * y;
 130
 131         for (x=0; x<width; x++)
 132         {
 133             temp = pixel[2];
 134             pixel[2] = pixel[0];
 135             pixel[0] = temp;
 136             pixel += bytesperpixel;
 137         }
 138     }
 139 }
 140
 141 HRESULT get_pixelformat_bpp(const GUID *pixelformat, UINT *bpp)
 142 {
 143     HRESULT hr;
 144     IWICComponentInfo *info;
 145     IWICPixelFormatInfo *formatinfo;
 146
 147     hr = CreateComponentInfo(pixelformat, &info);
 148     if (SUCCEEDED(hr))
 149     {
 150         hr = IWICComponentInfo_QueryInterface(info, &IID_IWICPixelFormatInfo, (void**)&formatinfo);
 151
 152         if (SUCCEEDED(hr))
 153         {
 154             hr = IWICPixelFormatInfo_GetBitsPerPixel(formatinfo, bpp);
 155
 156             IWICPixelFormatInfo_Release(formatinfo);
 157         }
 158
 159         IWICComponentInfo_Release(info);
 160     }
 161
 162     return hr;
 163 }