alphamask.cpp

网络游戏魔域源代码 测试可以完整变异

// AlphaMask.cpp: implementation of the CAlphaMask class.
//
//////////////////////////////////////////////////////////////////////


#include "basefunc.h"
#include "MyDataFile.h"
#include "AlphaMask.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

//----------------------------------------
CAlphaMask::CAlphaMask()
{
	m_pBuffer = NULL;
}
//----------------------------------------
CAlphaMask::~CAlphaMask()
{
	SAFE_DELETE(m_pBuffer);
}
//----------------------------------------
BOOL CAlphaMask::CreateBuffer()
{
	SAFE_DELETE(m_pBuffer);
	int nBufferSize = (m_sizeInfo.iWidth * m_sizeInfo.iHeight)/8+1;
	m_pBuffer = new BYTE[nBufferSize];
	if(!m_pBuffer)
		return false;
	return true;
}
//----------------------------------------
BOOL CAlphaMask::IsTransparent(CMyPos posPoint)
{
	if	((posPoint.x < 0) ||
		(posPoint.y < 0) ||
		(posPoint.x >= m_sizeInfo.iWidth) ||
		(posPoint.y >= m_sizeInfo.iHeight))
		return true;
	
	int nIndex = posPoint.x + posPoint.y*m_sizeInfo.iWidth;

	int nByteOffset = 0; //要偏移几个Byte
	int nBitOffset = 0;  //的几个Bit
	nByteOffset = nIndex/8;
	nBitOffset = nIndex%8;
	BYTE* bData = m_pBuffer+nByteOffset;
	

	BYTE bMask = 1 << nBitOffset;
	if(bMask & *bData)
		return false;
	return true;
}
//----------------------------------------
BOOL CAlphaMask::Load(CMySize sizeBmp, char* pszFileName)
{
	if(!pszFileName)
		return false;
	m_sizeInfo = sizeBmp;
	if(!this->CreateBuffer())
		return false;
	// read ...
	FILE* fp = fopen(pszFileName, "rb");
	if(!fp)
	{
		DWORD dwSize = 0;
		void* pBuf = ::MyDataFileLoad(pszFileName, dwSize);
		if (!pBuf)
			return false;

		return this->Load(sizeBmp, pBuf);
	}

	int nBufferSize = (m_sizeInfo.iWidth * m_sizeInfo.iHeight)/8+1;
	fread(m_pBuffer, 1, nBufferSize, fp);
	fclose(fp);

	return true;
}
//----------------------------------------
BOOL CAlphaMask::Load(CMySize sizeBmp, void * pMaskData)
{
	if(!pMaskData)
		return false;
	m_sizeInfo = sizeBmp;
	if(!this->CreateBuffer())
		return false;
	int nBufferSize = (m_sizeInfo.iWidth * m_sizeInfo.iHeight)/8+1;
	memcpy(m_pBuffer,  pMaskData, nBufferSize);
	return true;
}