text: /****************************************************************************
  Copyright (c) 2010 cocos2d-x.org
  
  http://www.cocos2d-x.org
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  THE SOFTWARE.
  ****************************************************************************/
  
  NS_CC_BEGIN;
  
  /**
  @brief	A memory DC which uses to draw text on bitmap.
  */
  class BitmapDC
  {
  public:
      BitmapDC(HWND hWnd = NULL)
      : m_hDC(NULL)
      , m_hBmp(NULL)
      , m_hFont((HFONT)GetStockObject(DEFAULT_GUI_FONT))
  	, m_hWnd(NULL)
      {
  		m_hWnd = hWnd;
          HDC hdc = GetDC(hWnd);
          m_hDC   = CreateCompatibleDC(hdc);
          ReleaseDC(hWnd, hdc);
      }
  
      ~BitmapDC()
      {
          prepareBitmap(0, 0);
          if (m_hDC)
          {
              DeleteDC(m_hDC);
          }
          HFONT hDefFont = (HFONT)GetStockObject(DEFAULT_GUI_FONT);
          if (hDefFont != m_hFont)
          {
              DeleteObject(m_hFont);
              m_hFont = hDefFont;
          }
  		// release temp font resource	
  		if (m_curFontPath.size() > 0)
  		{
  			wchar_t * pwszBuffer = utf8ToUtf16(m_curFontPath);
  			if (pwszBuffer)
  			{
  				RemoveFontResource(pwszBuffer);
  				SendMessage( m_hWnd, WM_FONTCHANGE, 0, 0);
  				delete [] pwszBuffer;
  				pwszBuffer = NULL;
  			}
  		}
      }
  
  	wchar_t * utf8ToUtf16(std::string nString)
  	{
  		wchar_t * pwszBuffer = NULL;
  		do 
  		{
  			if (nString.size() < 0)
  			{
  				break;
  			}
  			// utf-8 to utf-16
  			int nLen = nString.size();
  			int nBufLen  = nLen + 1;			
  			pwszBuffer = new wchar_t[nBufLen];
  			CC_BREAK_IF(! pwszBuffer);
  			memset(pwszBuffer,0,nBufLen);
  			nLen = MultiByteToWideChar(CP_UTF8, 0, nString.c_str(), nLen, pwszBuffer, nBufLen);		
  			pwszBuffer[nLen] = '\0';
  		} while (0);	
  		return pwszBuffer;
  
  	}
  
      bool setFont(const char * pFontName = NULL, int nSize = 0)
      {
          bool bRet = false;
          do 
          {
  			std::string fontName = pFontName;
  			std::string fontPath;
              HFONT       hDefFont = (HFONT)GetStockObject(DEFAULT_GUI_FONT);
              LOGFONTA    tNewFont = {0};
              LOGFONTA    tOldFont = {0};
              GetObjectA(hDefFont, sizeof(tNewFont), &tNewFont);
              if (fontName.c_str())
              {	
  				// create font from ttf file
  				int nFindttf = fontName.find(".ttf");
  				int nFindTTF = fontName.find(".TTF");
  				if (nFindttf >= 0 || nFindTTF >= 0)
  				{
  					fontPath = CCFileUtils::fullPathFromRelativePath(fontName.c_str());
  					int nFindPos = fontName.rfind("/");
  					fontName = &fontName[nFindPos+1];
  					nFindPos = fontName.rfind(".");
  					fontName = fontName.substr(0,nFindPos);				
  				}
  				tNewFont.lfCharSet = DEFAULT_CHARSET;
                  strcpy_s(tNewFont.lfFaceName, LF_FACESIZE, fontName.c_str());
              }
              if (nSize)
              {
                  tNewFont.lfHeight = -nSize;
              }
              GetObjectA(m_hFont,  sizeof(tOldFont), &tOldFont);
  
              if (tOldFont.lfHeight == tNewFont.lfHeight
                  && ! strcpy(tOldFont.lfFaceName, tNewFont.lfFaceName))
              {
                  // already has the font 
                  bRet = true;
                  break;
              }
  
              // delete old font
              if (m_hFont != hDefFont)
              {
                  DeleteObject(m_hFont);
  				// release old font register
  				if (m_curFontPath.size() > 0)
  				{
  					wchar_t * pwszBuffer = utf8ToUtf16(m_curFontPath);
  					if (pwszBuffer)
  					{
  						if(RemoveFontResource(pwszBuffer))
  						{
  							SendMessage( m_hWnd, WM_FONTCHANGE, 0, 0);
  						}						
  						delete [] pwszBuffer;
  						pwszBuffer = NULL;
  					}
  				}
  				fontPath.size()>0?(m_curFontPath = fontPath):(m_curFontPath.clear());
  				// register temp font
  				if (m_curFontPath.size() > 0)
  				{
  					wchar_t * pwszBuffer = utf8ToUtf16(m_curFontPath);
  					if (pwszBuffer)
  					{
  						if(AddFontResource(pwszBuffer))
  						{
  							SendMessage( m_hWnd, WM_FONTCHANGE, 0, 0);
  						}						
  						delete [] pwszBuffer;
  						pwszBuffer = NULL;
  					}
  				}
              }
              m_hFont = NULL;
  
              // create new font
              m_hFont = CreateFontIndirectA(&tNewFont);
              if (! m_hFont)
              {
                  // create failed, use default font
                  m_hFont = hDefFont;
                  break;
              }
              
              bRet = true;
          } while (0);
          return bRet;
      }
  
      SIZE sizeWithText(const char * pszText, int nLen, DWORD dwFmt, LONG nWidthLimit)
      {
          SIZE tRet = {0};
          do 
          {
              CC_BREAK_IF(! pszText || nLen <= 0);
  
              RECT rc = {0, 0, 0, 0};
              DWORD dwCalcFmt = DT_CALCRECT;
  
              if (nWidthLimit > 0)
              {
                  rc.right = nWidthLimit;
                  dwCalcFmt |= DT_WORDBREAK
                      | (dwFmt & DT_CENTER)
                      | (dwFmt & DT_RIGHT);
              }
              // use current font to measure text extent
              HGDIOBJ hOld = SelectObject(m_hDC, m_hFont);
  
              // measure text size
              DrawTextA(m_hDC, pszText, nLen, &rc, dwCalcFmt);
              SelectObject(m_hDC, hOld);
  
              tRet.cx = rc.right;
              tRet.cy = rc.bottom;
          } while (0);
  
          return tRet;
      }
  
      bool prepareBitmap(int nWidth, int nHeight)
      {
          // release bitmap
          if (m_hBmp)
          {
              DeleteObject(m_hBmp);
              m_hBmp = NULL;
          }
          if (nWidth > 0 && nHeight > 0)
          {
              m_hBmp = CreateBitmap(nWidth, nHeight, 1, 32, NULL);
              if (! m_hBmp)
              {
                  return false;
              }
          }
          return true;
      }
  
      int drawText(const char * pszText, SIZE& tSize, CCImage::ETextAlign eAlign)
      {
          int nRet = 0;
          wchar_t * pwszBuffer = 0;
          do 
          {
              CC_BREAK_IF(! pszText);
  
              DWORD dwFmt = DT_WORDBREAK;
              DWORD dwHoriFlag = eAlign & 0x0f;
              DWORD dwVertFlag = (eAlign & 0xf0) >> 4;
  
              switch (dwHoriFlag)
              {
              case 1: // left
                  dwFmt |= DT_LEFT;
                  break;
              case 2: // right
                  dwFmt |= DT_RIGHT;
                  break;
              case 3: // center
                  dwFmt |= DT_CENTER;
                  break;
              }
  
              int nLen = strlen(pszText);
              SIZE newSize = sizeWithText(pszText, nLen, dwFmt, tSize.cx);
  
              RECT rcText = {0};
              // if content width is 0, use text size as content size
              if (tSize.cx <= 0)
              {
                  tSize = newSize;
                  rcText.right  = newSize.cx;
                  rcText.bottom = newSize.cy;
              }
              else
              {
  
                  LONG offsetX = 0;
                  LONG offsetY = 0;
                  rcText.right = newSize.cx; // store the text width to rectangle
  
                  // calculate text horizontal offset
                  if (1 != dwHoriFlag          // and text isn't align to left
                      && newSize.cx < tSize.cx)   // and text's width less then content width,
                  {                               // then need adjust offset of X.
                      offsetX = (2 == dwHoriFlag) ? tSize.cx - newSize.cx     // align to right
                          : (tSize.cx - newSize.cx) / 2;                      // align to center
                  }
  
                  // if content height is 0, use text height as content height
                  // else if content height less than text height, use content height to draw text
                  if (tSize.cy <= 0)
                  {
                      tSize.cy = newSize.cy;
                      dwFmt   |= DT_NOCLIP;
                      rcText.bottom = newSize.cy; // store the text height to rectangle
                  }
                  else if (tSize.cy < newSize.cy)
                  {
                      // content height larger than text height need, clip text to rect
                      rcText.bottom = tSize.cy;
                  }
                  else
                  {
                      rcText.bottom = newSize.cy; // store the text height to rectangle
  
                      // content larger than text, need adjust vertical position
                      dwFmt |= DT_NOCLIP;
  
                      // calculate text vertical offset
                      offsetY = (2 == dwVertFlag) ? tSize.cy - newSize.cy     // align to bottom
                          : (3 == dwVertFlag) ? (tSize.cy - newSize.cy) / 2   // align to middle
                          : 0;                                                // align to top
                  }
  
                  if (offsetX || offsetY)
                  {
                      OffsetRect(&rcText, offsetX, offsetY);
                  }
              }
  
              CC_BREAK_IF(! prepareBitmap(tSize.cx, tSize.cy));
  
              // draw text
              HGDIOBJ hOldFont = SelectObject(m_hDC, m_hFont);
              HGDIOBJ hOldBmp  = SelectObject(m_hDC, m_hBmp);
              
              SetBkMode(m_hDC, TRANSPARENT);
              SetTextColor(m_hDC, RGB(255, 255, 255)); // white color
  
              // utf-8 to utf-16
              int nBufLen  = nLen + 1;
              pwszBuffer = new wchar_t[nBufLen];
              CC_BREAK_IF(! pwszBuffer);
              nLen = MultiByteToWideChar(CP_UTF8, 0, pszText, nLen, pwszBuffer, nBufLen);
  
              // draw text
              nRet = DrawTextW(m_hDC, pwszBuffer, nLen, &rcText, dwFmt);
              //DrawTextA(m_hDC, pszText, nLen, &rcText, dwFmt);
  
              SelectObject(m_hDC, hOldBmp);
              SelectObject(m_hDC, hOldFont);
          } while (0);
          CC_SAFE_DELETE_ARRAY(pwszBuffer);
          return nRet;
      }
  
      CC_SYNTHESIZE_READONLY(HDC, m_hDC, DC);
      CC_SYNTHESIZE_READONLY(HBITMAP, m_hBmp, Bitmap);
  private:
      friend class CCImage;
      HFONT   m_hFont;
  	HWND	m_hWnd;
  	std::string m_curFontPath;
  };
  
  static BitmapDC& sharedBitmapDC()
  {
      static BitmapDC s_BmpDC;
      return s_BmpDC;
  }
  
  bool CCImage::initWithString(
                                 const char *    pText, 
                                 int             nWidth/* = 0*/, 
                                 int             nHeight/* = 0*/,
                                 ETextAlign      eAlignMask/* = kAlignCenter*/,
                                 const char *    pFontName/* = nil*/,
                                 int             nSize/* = 0*/)
  {
      bool bRet = false;
      unsigned char * pImageData = 0;
      do 
      {
          CC_BREAK_IF(! pText);       
  
          BitmapDC& dc = sharedBitmapDC();
  
          if (! dc.setFont(pFontName, nSize))
          {
              CCLog("Can't found font(%s), use system default", pFontName);
          }
  
          // draw text
          SIZE size = {nWidth, nHeight};
          CC_BREAK_IF(! dc.drawText(pText, size, eAlignMask));
  
          pImageData = new unsigned char[size.cx * size.cy * 4];
          CC_BREAK_IF(! pImageData);
  
          struct
          {
              BITMAPINFOHEADER bmiHeader;
              int mask[4];
          } bi = {0};
          bi.bmiHeader.biSize = sizeof(bi.bmiHeader);
          CC_BREAK_IF(! GetDIBits(dc.getDC(), dc.getBitmap(), 0, 0, 
              NULL, (LPBITMAPINFO)&bi, DIB_RGB_COLORS));
  
          m_nWidth    = (short)size.cx;
          m_nHeight   = (short)size.cy;
          m_bHasAlpha = true;
          m_bPreMulti = false;
          m_pData     = pImageData;
          pImageData  = 0;
          m_nBitsPerComponent = 8;
          // copy pixed data
          bi.bmiHeader.biHeight = (bi.bmiHeader.biHeight > 0)
             ? - bi.bmiHeader.biHeight : bi.bmiHeader.biHeight;
          GetDIBits(dc.getDC(), dc.getBitmap(), 0, m_nHeight, m_pData, 
              (LPBITMAPINFO)&bi, DIB_RGB_COLORS);
  
          // change pixel's alpha value to 255, when it's RGB != 0
          COLORREF * pPixel = NULL;
          for (int y = 0; y < m_nHeight; ++y)
          {
              pPixel = (COLORREF *)m_pData + y * m_nWidth;
              for (int x = 0; x < m_nWidth; ++x)
              {
                  COLORREF& clr = *pPixel;
                  if (GetRValue(clr) || GetGValue(clr) || GetBValue(clr))
                  {
                      clr |= 0xff000000;
                  }
                  ++pPixel;
              }
          }
  
          bRet = true;
      } while (0);
  
      return bRet;
  }
  
  NS_CC_END;
  