hlsdk-portable/game_shared/vgui_loadtga.cpp

//========= Copyright (c) 1996-2002, Valve LLC, All rights reserved. ============
//
// Purpose: 
//
// $NoKeywords: $
//=============================================================================

#include "../cl_dll/wrect.h"
#include "../cl_dll/cl_dll.h"
#include "VGUI.h"
#include "vgui_loadtga.h"
#include "VGUI_InputStream.h"

// ---------------------------------------------------------------------- //
// Helper class for loading tga files.
// ---------------------------------------------------------------------- //
class MemoryInputStream : public vgui::InputStream
{
public:
	MemoryInputStream()
	{
		m_pData = NULL;
		m_DataLen = m_ReadPos = 0;
	}
		
	virtual void	seekStart( bool &success )
	{
		m_ReadPos = 0;
		success = true;
	}

	virtual void	seekRelative( int count, bool &success )
	{
		m_ReadPos += count;
		success = true;
	}

	virtual void	seekEnd( bool &success )
	{
		m_ReadPos = m_DataLen;
		success = true;
	}

	virtual int	getAvailable( bool &success )
	{
		// This is what vgui does for files...
		success = false;
		return 0;
	}

	virtual uchar	readUChar( bool & success )
	{
		if( m_ReadPos >= 0 && m_ReadPos < m_DataLen )
		{
			success = true;
			uchar ret = m_pData[m_ReadPos];
			++m_ReadPos;
			return ret;
		}
		else
		{
			success = false;
			return 0;
		}
	}

	virtual void	readUChar( uchar *buf, int count, bool &success )
	{
		for( int i = 0; i < count; i++)
			buf[i] = readUChar( success );
	}

	virtual void	close( bool &success) 
	{
		m_pData = NULL;
		m_DataLen = m_ReadPos = 0;
	}

	uchar			*m_pData;
	int			 m_DataLen;
	int			 m_ReadPos;
};

vgui::BitmapTGA *vgui_LoadTGA( char const *pFilename )
{
	MemoryInputStream stream;
	
	stream.m_pData = gEngfuncs.COM_LoadFile( (char*)pFilename, 5, &stream.m_DataLen );
	if( !stream.m_pData )
		return NULL;
	
	stream.m_ReadPos = 0;
	vgui::BitmapTGA *pRet = new vgui::BitmapTGA( &stream, true );
	gEngfuncs.COM_FreeFile( stream.m_pData );

	return pRet;
}

vgui::BitmapTGA *vgui_LoadTGANoInvertAlpha( char const *pFilename )
{
	MemoryInputStream stream;

	stream.m_pData = gEngfuncs.COM_LoadFile( (char*)pFilename, 5, &stream.m_DataLen );
	if( !stream.m_pData )
		return NULL;

	stream.m_ReadPos = 0;
	vgui::BitmapTGA *pRet = new vgui::BitmapTGA( &stream, false );
	gEngfuncs.COM_FreeFile( stream.m_pData );
	
	return pRet;
}