src/Utils/MiscUI/ExtTextOutFL.h

   1 // TortoiseGit - a Windows shell extension for easy version control
   2
   3 // Copyright (C) 2008, 2010 - TortoiseSVN
   4
   5 // This program is free software; you can redistribute it and/or
   6 // modify it under the terms of the GNU General Public License
   7 // as published by the Free Software Foundation; either version 2
   8 // of the License, or (at your option) any later version.
   9
  10 // This program is distributed in the hope that it will be useful,
  11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 // GNU General Public License for more details.
  14
  15 // You should have received a copy of the GNU General Public License
  16 // along with this program; if not, write to the Free Software Foundation,
  17 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 //
  19 #pragma once
  20 #include <mlang.h>
  21
  22
  23 // these functions are taken from an article of the 'old new thing' blog:
  24 // http://blogs.msdn.com/oldnewthing/archive/2004/07/16/185261.aspx
  25
  26
  27 HRESULT TextOutFL(HDC hdc, int x, int y, LPCWSTR psz, int cch)
  28 {
  29         ATL::CComPtr<IMLangFontLink2> pfl;
  30         HRESULT hr = pfl.CoCreateInstance(CLSID_CMultiLanguage, NULL, CLSCTX_ALL);
  31         if (FAILED(hr))
  32                 return hr;
  33
  34         HFONT hfOrig = (HFONT)GetCurrentObject(hdc, OBJ_FONT);
  35         POINT ptOrig;
  36         DWORD dwAlignOrig = GetTextAlign(hdc);
  37         if (!(dwAlignOrig & TA_UPDATECP))
  38         {
  39                 SetTextAlign(hdc, dwAlignOrig | TA_UPDATECP);
  40         }
  41         MoveToEx(hdc, x, y, &ptOrig);
  42         DWORD dwFontCodePages = 0;
  43         hr = pfl->GetFontCodePages(hdc, hfOrig, &dwFontCodePages);
  44         if (SUCCEEDED(hr))
  45         {
  46                 while (cch > 0)
  47                 {
  48                         DWORD dwActualCodePages;
  49                         long cchActual;
  50                         hr = pfl->GetStrCodePages(psz, cch, dwFontCodePages, &dwActualCodePages, &cchActual);
  51                         if (FAILED(hr))
  52                         {
  53                                 break;
  54                         }
  55
  56                         if (dwActualCodePages & dwFontCodePages)
  57                         {
  58                                 TextOut(hdc, 0, 0, psz, cchActual);
  59                         }
  60                         else
  61                         {
  62                                 HFONT hfLinked;
  63                                 if (FAILED(hr = pfl->MapFont(hdc, dwActualCodePages, 0, &hfLinked)))
  64                                 {
  65                                         break;
  66                                 }
  67                                 SelectObject(hdc, (HGDIOBJ)(HFONT)hfLinked);
  68                                 TextOut(hdc, 0, 0, psz, cchActual);
  69                                 SelectObject(hdc, (HGDIOBJ)(HFONT)hfOrig);
  70                                 pfl->ReleaseFont(hfLinked);
  71                         }
  72                         psz += cchActual;
  73                         cch -= cchActual;
  74                 }
  75                 if (FAILED(hr))
  76                 {
  77                         //  We started outputting characters so we have to finish.
  78                         //  Do the rest without font linking since we have no choice.
  79                         TextOut(hdc, 0, 0, psz, cch);
  80                         hr = S_FALSE;
  81                 }
  82         }
  83
  84         pfl.Release();
  85
  86         if (!(dwAlignOrig & TA_UPDATECP))
  87         {
  88                 SetTextAlign(hdc, dwAlignOrig);
  89                 MoveToEx(hdc, ptOrig.x, ptOrig.y, NULL);
  90         }
  91
  92         return hr;
  93 }
  94
  95 void TextOutTryFL(HDC hdc, int x, int y, LPCWSTR psz, int cch)
  96 {
  97         if (FAILED(TextOutFL(hdc, x, y, psz, cch)))
  98         {
  99                 TextOut(hdc, x, y, psz, cch);
 100         }
 101 }
 102