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