dll/win32/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 #define WIN32_NO_STATUS
  20 #define _INC_WINDOWS
  21 #define COM_NO_WINDOWS_H
  22
  23 #define COBJMACROS
  24 #include <config.h>
  25
  26 #include <stdarg.h>
  27
  28 #include <windef.h>
  29 #include <winbase.h>
  30 #include <objbase.h>
  31 #include <wincodec.h>
  32
  33 #include "wincodecs_private.h"
  34
  35 #include <wine/debug.h>
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(wincodecs);
  38
  39 extern BOOL WINAPI WIC_DllMain(HINSTANCE, DWORD, LPVOID) DECLSPEC_HIDDEN;
  40
  41 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
  42 {
  43
  44     switch (fdwReason)
  45     {
  46         case DLL_PROCESS_ATTACH:
  47             DisableThreadLibraryCalls(hinstDLL);
  48             break;
  49     }
  50
  51     return WIC_DllMain(hinstDLL, fdwReason, lpvReserved);
  52 }
  53
  54 HRESULT WINAPI DllCanUnloadNow(void)
  55 {
  56     return S_FALSE;
  57 }
  58
  59 HRESULT copy_pixels(UINT bpp, const BYTE *srcbuffer,
  60     UINT srcwidth, UINT srcheight, INT srcstride,
  61     const WICRect *rc, UINT dststride, UINT dstbuffersize, BYTE *dstbuffer)
  62 {
  63     UINT bytesperrow;
  64     UINT row_offset; /* number of bits into the source rows where the data starts */
  65     WICRect rect;
  66
  67     if (!rc)
  68     {
  69         rect.X = 0;
  70         rect.Y = 0;
  71         rect.Width = srcwidth;
  72         rect.Height = srcheight;
  73         rc = &rect;
  74     }
  75     else
  76     {
  77         if (rc->X < 0 || rc->Y < 0 || rc->X+rc->Width > srcwidth || rc->Y+rc->Height > srcheight)
  78             return E_INVALIDARG;
  79     }
  80
  81     bytesperrow = ((bpp * rc->Width)+7)/8;
  82
  83     if (dststride < bytesperrow)
  84         return E_INVALIDARG;
  85
  86     if ((dststride * (rc->Height-1)) + ((rc->Width * bpp) + 7)/8 > dstbuffersize)
  87         return E_INVALIDARG;
  88
  89     /* if the whole bitmap is copied and the buffer format matches then it's a matter of a single memcpy */
  90     if (rc->X == 0 && rc->Y == 0 && rc->Width == srcwidth && rc->Height == srcheight &&
  91         srcstride == dststride && srcstride == bytesperrow)
  92     {
  93         memcpy(dstbuffer, srcbuffer, srcstride * srcheight);
  94         return S_OK;
  95     }
  96
  97     row_offset = rc->X * bpp;
  98
  99     if (row_offset % 8 == 0)
 100     {
 101         /* everything lines up on a byte boundary */
 102         INT row;
 103         const BYTE *src;
 104         BYTE *dst;
 105
 106         src = srcbuffer + (row_offset / 8) + srcstride * rc->Y;
 107         dst = dstbuffer;
 108         for (row=0; row < rc->Height; row++)
 109         {
 110             memcpy(dst, src, bytesperrow);
 111             src += srcstride;
 112             dst += dststride;
 113         }
 114         return S_OK;
 115     }
 116     else
 117     {
 118         /* we have to do a weird bitwise copy. eww. */
 119         FIXME("cannot reliably copy bitmap data if bpp < 8\n");
 120         return E_FAIL;
 121     }
 122 }
 123
 124 void reverse_bgr8(UINT bytesperpixel, LPBYTE bits, UINT width, UINT height, INT stride)
 125 {
 126     UINT x, y;
 127     BYTE *pixel, temp;
 128
 129     for (y=0; y<height; y++)
 130     {
 131         pixel = bits + stride * y;
 132
 133         for (x=0; x<width; x++)
 134         {
 135             temp = pixel[2];
 136             pixel[2] = pixel[0];
 137             pixel[0] = temp;
 138             pixel += bytesperpixel;
 139         }
 140     }
 141 }
 142
 143 HRESULT get_pixelformat_bpp(const GUID *pixelformat, UINT *bpp)
 144 {
 145     HRESULT hr;
 146     IWICComponentInfo *info;
 147     IWICPixelFormatInfo *formatinfo;
 148
 149     hr = CreateComponentInfo(pixelformat, &info);
 150     if (SUCCEEDED(hr))
 151     {
 152         hr = IWICComponentInfo_QueryInterface(info, &IID_IWICPixelFormatInfo, (void**)&formatinfo);
 153
 154         if (SUCCEEDED(hr))
 155         {
 156             hr = IWICPixelFormatInfo_GetBitsPerPixel(formatinfo, bpp);
 157
 158             IWICPixelFormatInfo_Release(formatinfo);
 159         }
 160
 161         IWICComponentInfo_Release(info);
 162     }
 163
 164     return hr;
 165 }