保存图像到内存DC

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/haimianjie2012/article/details/81913148

HDC* CImageShow::InitShowDC(void)
{
	DeleteAppointedDC(&m_hShowDC);
	m_hShowDC = ::CreateCompatibleDC(this->GetDC()->GetSafeHdc());
	return &m_hShowDC;
}

CDC* pDC = m_ImgShow.GetDC();

BYTE  m_DispColorMap[256][3];	// 颜?色|?表à¨a

////颜?色|?生|¨2成¨|
void MakeNewColor(int Sel ,BYTE NewColorTable[256][3])
{
	int i;
//	BYTE r,g,b;
	for(i =0 ; i < 256; i ++)
	{
		NewColorTable[i][0] = 0;
		NewColorTable[i][1] = 0;
		NewColorTable[i][2] = 0;
	}
	switch(Sel)
	{
	case 0:
		for(i =0 ; i < 256; i ++)
		{
			NewColorTable[i][0] =  CaisiColorBar[i][0];
			NewColorTable[i][1] =  CaisiColorBar[i][1];
			NewColorTable[i][2] =  CaisiColorBar[i][2];
		}
		break;
	case 1://黑¨2白??á色|?标à¨o
		for(i =0 ; i < 256; i ++)
		{
			NewColorTable[i][0] = BlackWhiteColorBar[i][0];
			NewColorTable[i][1] = BlackWhiteColorBar[i][1];
			NewColorTable[i][2] = BlackWhiteColorBar[i][2];
		}
		break;
}
}

void CreateDispBmpData(CDC *pDC,CRect rc,int **tmpdata,int RefShowW,int RefShowH ,BYTE MapColor[256][3] , HDC *hdcMem 
					   ,bool falg)
{
	if ( pDC == NULL || tmpdata == NULL || hdcMem == NULL )
		return ;

	int i,j;
	int tmpw ,tmph;		
	//int Disp_W,Disp_H;
	// 原-数oy据Y大?¨?小?的ì?宽¨a高?
	tmpw = RefShowW /2 *2;
	tmph = RefShowH /2 *2;	

#if 1
    BYTE *pbyDisplayData = NULL;
    ReSize1dDataPointer( pbyDisplayData , tmpw * tmph * 3);
	
	if(!pbyDisplayData)
	{
		return;
	}
		
	for (i = 0; i < tmpw; i++ )
	{
		BYTE d;			
		for (j = 0; j < tmph ; j++)
		{ 				
			d = tmpdata[i][j];  // data
			int m = j *tmpw * 3 + i * 3;
			pbyDisplayData[m] = MapColor[d][2];
			pbyDisplayData[m + 1] = MapColor[d][1];
			pbyDisplayData[m + 2] = MapColor[d][0];
		}			
	}	

	HBITMAP hbmBMP = CreateCompatibleBitmap(pDC->m_hDC, tmpw, tmph );
	HGDIOBJ holdBmp = ::SelectObject(*hdcMem, hbmBMP);
	char image_info[sizeof(BITMAPINFOHEADER) + 256 * sizeof(RGBQUAD)];
	BITMAPINFOHEADER *pbmiHeader = (BITMAPINFOHEADER*)image_info;
	pbmiHeader->biSize = sizeof(BITMAPINFOHEADER);
	pbmiHeader->biWidth = tmpw;
	pbmiHeader->biHeight = tmph;
	pbmiHeader->biPlanes = 1;
	pbmiHeader->biBitCount = 24;
	pbmiHeader->biCompression = BI_RGB;
	pbmiHeader->biSizeImage = tmpw*tmph*3;
	pbmiHeader->biXPelsPerMeter = 0;
	pbmiHeader->biYPelsPerMeter = 0;
	pbmiHeader->biClrUsed = 0;
	pbmiHeader->biClrImportant = 0;	

	SetDIBits(*hdcMem, hbmBMP, 0, pbmiHeader->biHeight, pbyDisplayData, (BITMAPINFO*)pbmiHeader, DIB_RGB_COLORS);

	DeleteObject(hbmBMP);
	ReSize1dDataPointer( pbyDisplayData , 0 );

#endif
}