dlls/ole32/ole32_main.c

   1 /*
   2  *  OLE32 Initialization
   3  *
   4  * Copyright 2000 Huw D M Davies for CodeWeavers
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include <stdarg.h>
  22 #include <stdio.h>
  23
  24 #include "windef.h"
  25 #include "winbase.h"
  26 #include "wingdi.h"
  27 #include "winuser.h"
  28 #include "winnls.h"
  29 #include "objbase.h"
  30 #include "ole2.h"
  31 #include "wine/debug.h"
  32
  33 WINE_DEFAULT_DEBUG_CHANNEL(ole);
  34
  35 #define HIMETRIC_INCHES 2540
  36
  37 /***********************************************************************
  38  *              OleMetafilePictFromIconAndLabel (OLE32.@)
  39  */
  40 HGLOBAL WINAPI OleMetafilePictFromIconAndLabel(HICON hIcon, LPOLESTR lpszLabel,
  41                                                LPOLESTR lpszSourceFile, UINT iIconIndex)
  42 {
  43         METAFILEPICT mfp;
  44         HDC hdc;
  45         HGLOBAL hmem = NULL;
  46         LPVOID mfdata;
  47         static const char szIconOnly[] = "IconOnly";
  48         SIZE text_size = { 0, 0 };
  49         INT width;
  50         INT icon_width;
  51         INT icon_height;
  52         INT label_offset;
  53         HDC hdcScreen;
  54         LOGFONTW lf;
  55         HFONT font;
  56
  57         TRACE("%p %p %s %d\n", hIcon, lpszLabel, debugstr_w(lpszSourceFile), iIconIndex);
  58
  59         if( !hIcon )
  60                 return NULL;
  61
  62         if (!SystemParametersInfoW(SPI_GETICONTITLELOGFONT, sizeof(lf), &lf, 0))
  63                 return NULL;
  64
  65         font = CreateFontIndirectW(&lf);
  66         if (!font)
  67                 return NULL;
  68
  69         hdc = CreateMetaFileW(NULL);
  70         if( !hdc )
  71         {
  72                 DeleteObject(font);
  73                 return NULL;
  74         }
  75
  76         SelectObject(hdc, font);
  77
  78         ExtEscape(hdc, MFCOMMENT, sizeof(szIconOnly), szIconOnly, 0, NULL);
  79
  80         icon_width = GetSystemMetrics(SM_CXICON);
  81         icon_height = GetSystemMetrics(SM_CYICON);
  82         /* FIXME: should we give the label a bit of padding here? */
  83         label_offset = icon_height;
  84         if (lpszLabel)
  85         {
  86                 HFONT screen_old_font;
  87                 /* metafile DCs don't support GetTextExtentPoint32, so size the font
  88                  * using the desktop window DC */
  89                 hdcScreen = GetDC(NULL);
  90                 screen_old_font = SelectObject(hdcScreen, font);
  91                 GetTextExtentPoint32W(hdcScreen, lpszLabel, lstrlenW(lpszLabel), &text_size);
  92                 SelectObject(hdcScreen, screen_old_font);
  93                 ReleaseDC(NULL, hdcScreen);
  94
  95                 width = 3 * icon_width;
  96         }
  97         else
  98                 width = icon_width;
  99
 100         SetMapMode(hdc, MM_ANISOTROPIC);
 101         SetWindowOrgEx(hdc, 0, 0, NULL);
 102         SetWindowExtEx(hdc, width, label_offset + text_size.cy, NULL);
 103
 104         /* draw the icon centered */
 105         DrawIcon(hdc, (width-icon_width) / 2, 0, hIcon);
 106         if(lpszLabel)
 107                 /* draw the label centered too, if provided */
 108                 TextOutW(hdc, (width-text_size.cx) / 2, label_offset, lpszLabel, lstrlenW(lpszLabel));
 109
 110         if (lpszSourceFile)
 111         {
 112                 char szIconIndex[10];
 113                 int path_length = WideCharToMultiByte(CP_ACP,0,lpszSourceFile,-1,NULL,0,NULL,NULL);
 114                 if (path_length > 1)
 115                 {
 116                         char * szPath = CoTaskMemAlloc(path_length * sizeof(CHAR));
 117                         if (szPath)
 118                         {
 119                                 WideCharToMultiByte(CP_ACP,0,lpszSourceFile,-1,szPath,path_length,NULL,NULL);
 120                                 ExtEscape(hdc, MFCOMMENT, path_length, szPath, 0, NULL);
 121                                 CoTaskMemFree(szPath);
 122                         }
 123                 }
 124                 snprintf(szIconIndex, 10, "%u", iIconIndex);
 125                 ExtEscape(hdc, MFCOMMENT, strlen(szIconIndex)+1, szIconIndex, 0, NULL);
 126         }
 127
 128         mfp.mm = MM_ANISOTROPIC;
 129         hdcScreen = GetDC(NULL);
 130         mfp.xExt = MulDiv(width, HIMETRIC_INCHES, GetDeviceCaps(hdcScreen, LOGPIXELSX));
 131         mfp.yExt = MulDiv(label_offset + text_size.cy, HIMETRIC_INCHES, GetDeviceCaps(hdcScreen, LOGPIXELSY));
 132         ReleaseDC(NULL, hdcScreen);
 133         mfp.hMF = CloseMetaFile(hdc);
 134         DeleteObject(font);
 135         if( !mfp.hMF )
 136                 return NULL;
 137
 138         hmem = GlobalAlloc( GMEM_MOVEABLE, sizeof(mfp) );
 139         if( !hmem )
 140         {
 141                 DeleteMetaFile(mfp.hMF);
 142                 return NULL;
 143         }
 144
 145         mfdata = GlobalLock( hmem );
 146         if( !mfdata )
 147         {
 148                 GlobalFree( hmem );
 149                 DeleteMetaFile(mfp.hMF);
 150                 return NULL;
 151         }
 152
 153         memcpy(mfdata,&mfp,sizeof(mfp));
 154         GlobalUnlock( hmem );
 155
 156         TRACE("returning %p\n",hmem);
 157
 158         return hmem;
 159 }
 160
 161 /******************************************************************************
 162  *              IsValidInterface        [OLE32.@]
 163  *
 164  * Determines whether a pointer is a valid interface.
 165  *
 166  * PARAMS
 167  *  punk [I] Interface to be tested.
 168  *
 169  * RETURNS
 170  *  TRUE, if the passed pointer is a valid interface, or FALSE otherwise.
 171  */
 172 BOOL WINAPI IsValidInterface(LPUNKNOWN punk)
 173 {
 174         return !(IsBadReadPtr(punk,4) ||
 175                  IsBadReadPtr(punk->lpVtbl,4) ||
 176                  IsBadReadPtr(punk->lpVtbl->QueryInterface,9) ||
 177                  IsBadCodePtr((FARPROC)punk->lpVtbl->QueryInterface));
 178 }