txtcntnr.cpp

linux下的一款播放器

/* ***** BEGIN LICENSE BLOCK *****
 * Source last modified: $Id: txtcntnr.cpp,v 1.1.2.1 2004/07/09 01:50:20 hubbe Exp $
 * 
 * Portions Copyright (c) 1995-2004 RealNetworks, Inc. All Rights Reserved.
 * 
 * The contents of this file, and the files included with this file,
 * are subject to the current version of the RealNetworks Public
 * Source License (the "RPSL") available at
 * http://www.helixcommunity.org/content/rpsl unless you have licensed
 * the file under the current version of the RealNetworks Community
 * Source License (the "RCSL") available at
 * http://www.helixcommunity.org/content/rcsl, in which case the RCSL
 * will apply. You may also obtain the license terms directly from
 * RealNetworks.  You may not use this file except in compliance with
 * the RPSL or, if you have a valid RCSL with RealNetworks applicable
 * to this file, the RCSL.  Please see the applicable RPSL or RCSL for
 * the rights, obligations and limitations governing use of the
 * contents of the file.
 * 
 * Alternatively, the contents of this file may be used under the
 * terms of the GNU General Public License Version 2 or later (the
 * "GPL") in which case the provisions of the GPL are applicable
 * instead of those above. If you wish to allow use of your version of
 * this file only under the terms of the GPL, and not to allow others
 * to use your version of this file under the terms of either the RPSL
 * or RCSL, indicate your decision by deleting the provisions above
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 * the GPL. If you do not delete the provisions above, a recipient may
 * use your version of this file under the terms of any one of the
 * RPSL, the RCSL or the GPL.
 * 
 * This file is part of the Helix DNA Technology. RealNetworks is the
 * developer of the Original Code and owns the copyrights in the
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 * 
 * This file, and the files included with this file, is distributed
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 * ***** END LICENSE BLOCK ***** */

/////////////////////////////////////////////////////////////////////////////
//
//  TXTCNTNR.CPP
//
//  TextContainer class implementation.
//
//	A class TextContainer object holds the actual buffer of text to be
//	rendered.
//
//  TextContainerList class implementation.
//
//	A class TextContainerList object is a list of TextContainer objects.
//

#include "hxtypes.h"
#include "hxstack.h"
#include "hxslist.h"

#include "rt_types.h" //for _CHAR
#include "rt_string.h"//for stringCopy() and stringAppend().

#include "fontdefs.h"  //(broke defs out of txtattrb.h)
#include "fontinfo.h"  //For ConvertAcrossCharsets()

#include "txtattrb.h" //for class TextAttributes.
#include "txtcntnr.h"

#include "hxheap.h"
#ifdef _DEBUG
#undef HX_THIS_FILE		
static char HX_THIS_FILE[] = __FILE__;
#endif


/////////////////////////////////////////////////////////////////////////////
//class TextContainer methods:  (TextContainerList methods are further down)
/////////////////////////////////////////////////////////////////////////////
//
TextContainer::TextContainer(_CHAR* pText, ULONG32 textLen)
	: m_pBuffer(NULL)
	, m_bTextShouldBeDrawn(FALSE)
	, m_bFinalDrawWasDone(FALSE)
	, m_ulTimeOfLastClearTag(0L)
	, m_lAmountLoopedSoFar(0L)
{
    m_textHasChanged = overwriteText(pText, textLen);
    if(m_textHasChanged)
    {
	m_textLengthPlus1=textLen+1;
    }
    else
    {
	m_textLengthPlus1=0L;
    }
} 


/////////////////////////////////////////////////////////////////////////////
//
void TextContainer::deleteBuffer()
{
    if(m_pBuffer)
    {
	delete [] m_pBuffer;
	m_pBuffer = NULL;

	m_textLengthPlus1 = 0L;
    }
} 


/////////////////////////////////////////////////////////////////////////////
//
BOOL TextContainer::appendText(_CHAR* pMoreText, ULONG32 moreTextLen) 
{
    ULONG32 lenNeeded;
    BOOL append;
    if(moreTextLen<1)
    {
	return FALSE;
    }
    if(!getTextLengthPlus1()  ||  !m_pBuffer)
    {
	lenNeeded = moreTextLen+1;
	append = FALSE;
    }
    else 
    {	/*  Delete current buffer and replace with one long enough for
	 *  new text, too:  */
	lenNeeded = getTextLengthPlus1(); //includes terminating '\0' char.
	lenNeeded += moreTextLen;
	append = TRUE;
    }
    _CHAR* pTmpBuffer = new _CHAR[lenNeeded];
    HX_ASSERT_VALID_PTR(pTmpBuffer);
    if(!pTmpBuffer)
    {
	return(FALSE); //returns FALSE.
    }

    stringCopy(pTmpBuffer, m_pBuffer, m_textLengthPlus1-1);
    if(append)
    {
	stringAppend(pTmpBuffer, lenNeeded-1, pMoreText, moreTextLen);
    }
    deleteBuffer();
    m_pBuffer = pTmpBuffer;
    m_textLengthPlus1 = lenNeeded;
    m_textHasChanged=TRUE;
    return TRUE;
} 


/////////////////////////////////////////////////////////////////////////////
//
BOOL TextContainer::overwriteText(_CHAR* pNewText, ULONG32 len) 
{
    if(!pNewText  ||  0L == len)
    {
	return FALSE;
    }
    deleteBuffer();
    m_pBuffer = new _CHAR[len+1];
    HX_ASSERT_VALID_PTR(m_pBuffer); 
    if(!m_pBuffer)
    {
	return(FALSE);
    }
    stringCopy(m_pBuffer, pNewText, len);
    m_textLengthPlus1 = len+1;
    m_textHasChanged=TRUE;
    return TRUE;
}


    

/////////////////////////////////////////////////////////////////////////////
//
//This function converts characters from mac-roman to iso-8859-1
// (us-ascii) or vice versa, depending on both the client operating
// system and the active charset of *this.  So, if we're rendering on a
// Macintosh, the following RealText as authored in Windows Notepad
// would do as it says:
//	<font charset="iso-8859-1">"