imgscaleview.cpp

这是一个图像处理的程序,改变参数控制图片的大小

// ImgScaleView.cpp : implementation of the CImgScaleView class
//

#include "stdafx.h"
#include "ImgScale.h"

#include "ImgScaleDoc.h"
#include "ImgScaleView.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

#include "ImageGeometry.h"
#include "ImageScaleDialog.h"

/////////////////////////////////////////////////////////////////////////////
// CImgScaleView

IMPLEMENT_DYNCREATE(CImgScaleView,  CView)

BEGIN_MESSAGE_MAP(CImgScaleView,  CView)
	//{{AFX_MSG_MAP(CImgScaleView)
	ON_COMMAND(IDM_IMAGE_SCALE,  OnImageScale)
	ON_UPDATE_COMMAND_UI(IDM_IMAGE_SCALE,  OnUpdateImageScale)
	ON_COMMAND(IDM_IMAGE_RESTORE,  OnImageRestore)
	ON_UPDATE_COMMAND_UI(IDM_IMAGE_RESTORE,  OnUpdateImageRestore)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CImgScaleView construction/destruction

CImgScaleView::CImgScaleView()
{
	// TODO: add construction code here
	m_nWidth = 800;
	m_nHeight = 600;
	m_dwOperation = 0L;
	
	m_nQuality = 0;
	m_fsx = m_fsy = 1.0f;

}

CImgScaleView::~CImgScaleView()
{
}

BOOL CImgScaleView::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CImgScaleView drawing

void CImgScaleView::OnDraw(CDC* pDC)
{
	CImgScaleDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	CDib* pDib = pDoc->m_pDib;
	if(pDib)
	{
		BeginWaitCursor();
		m_nWidth = (int)pDib->GetWidth();
		m_nHeight = (int)pDib->GetHeight(); 

		CDC memDC;
		memDC.CreateCompatibleDC(pDC);
		CBitmap ddb;
		ddb.CreateCompatibleBitmap(pDC, m_nWidth, m_nHeight);
		CBitmap* pOldBitmap = memDC.SelectObject(&ddb);

		pDib->Draw(memDC.m_hDC, 0, 0, m_nWidth, m_nHeight, 
					0, 0, m_nWidth, m_nHeight, DIB_RGB_COLORS, SRCCOPY);
		
		if(m_dwOperation == 0L)
			pDC->BitBlt(0, 0, m_nWidth, m_nHeight, &memDC, 0, 0, SRCCOPY);
		else
			Scale(pDC, pDib, 0, 0, m_nWidth, m_nHeight);
			//Scale(pDC, pDib, 100, 100, 100, 100);
		
		memDC.SelectObject(pOldBitmap);
		ddb.DeleteObject();
		EndWaitCursor();
	}

}

/////////////////////////////////////////////////////////////////////////////
// CImgScaleView diagnostics

#ifdef _DEBUG
void CImgScaleView::AssertValid() const
{
	CView::AssertValid();
}

void CImgScaleView::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

CImgScaleDoc* CImgScaleView::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CImgScaleDoc)));
	return (CImgScaleDoc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CImgScaleView message handlers

void CImgScaleView::OnImageScale() 
{
	// TODO: Add your command handler code here
	CImageScaleDialog dlg;
	
	dlg.m_fScalex = m_fsx;
	dlg.m_fScaley = m_fsy;
	dlg.m_nQuality = m_nQuality;


	int responeDlg = dlg.DoModal();
	if(responeDlg == IDOK)
	{
		m_fsx = dlg.m_fScalex;
		m_fsy = dlg.m_fScaley;
		m_nQuality = dlg.m_nQuality;
		m_dwOperation = IMAGE_GEOMETRY_SCALE;
		Invalidate();
	}
}

void CImgScaleView::OnUpdateImageScale(CCmdUI* pCmdUI) 
{
	// TODO: Add your command update UI handler code here
	if(m_dwOperation != 0L)
		pCmdUI ->SetCheck(TRUE);
	else
		pCmdUI ->SetCheck(FALSE);
}

void CImgScaleView::OnImageRestore() 
{
	// TODO: Add your command handler code here
	m_dwOperation = 0L;
	Invalidate();
}

void CImgScaleView::OnUpdateImageRestore(CCmdUI* pCmdUI) 
{
	// TODO: Add your command update UI handler code here
	if(m_dwOperation == 0L)
		pCmdUI ->SetCheck(TRUE);
	else
		pCmdUI ->SetCheck(FALSE);	
}

void CImgScaleView::Scale(CDC *pDC,  CDib *pDib,  int x,  int y,  int nWidth,  int nHeight)
{
	ASSERT(pDib);
	
	//限制处理的区域----防止任意填写数据而使用访问无效
	if((x > (m_nWidth - 1)) || (y > (m_nHeight - 1))) return ;
	//实际处理的宽度和高度
	int w = min(nWidth, m_nWidth - x);
	int h = min(nHeight, m_nHeight - y);
	
	// 32位颜色数据:输入源
	DWORD dwSizeSrc = m_nWidth * m_nHeight * 4;

	//分配全局内存 32位源数据
	BYTE* pbyBitsSrc32 =  new BYTE[dwSizeSrc];
	if(pbyBitsSrc32 == NULL) return;
	memset(pbyBitsSrc32,  0 ,  dwSizeSrc);


	//CDib类只提供了一个全部数据的函数
	pDib->GetDdbData32(pbyBitsSrc32);

	//目的地的有效宽度和有效高度
	int nWidthDst = (int)(m_fsx * nWidth + 0.5f);
	int nHeightDst = (int)(m_fsy * nHeight + 0.5f);
	
	DWORD dwSizeDst = ((DWORD)(nWidthDst * nHeightDst)) * 4;
	
	BYTE* pbyBitsDst32 =  new BYTE[dwSizeDst];
	if(pbyBitsDst32 == NULL) return;
	memset(pbyBitsDst32,  0,  dwSizeDst);
	
	CImageGeometry* ig = new CImageGeometry();
	
	//设置插值质量
	if(m_nQuality == 0)
		ig->SetQuality( IMAGE_GEOMETRY_NEAREST_NEIGHBOR_INTERPOLATE );
	else if(m_nQuality == 1)
		ig->SetQuality( IMAGE_GEOMETRY_BILINEAR_INTERPOLATE );
	else if(m_nQuality == 2)
		ig->SetQuality( IMAGE_GEOMETRY_THREE_ORDER_INTERPOLATE );

	ig->Scale(pbyBitsSrc32, x, y, w, h, m_nWidth, m_nHeight, pbyBitsDst32, nWidthDst, nHeightDst);

	CClientDC dc(this);
	CDC memDC;
	memDC.CreateCompatibleDC(&dc);
	HBITMAP hBitmap = ig->CreateDdb(pDC->m_hDC, nWidthDst, nHeightDst, pbyBitsDst32);
	HBITMAP hOldBitmap = (HBITMAP)memDC.SelectObject(hBitmap);
	pDC->BitBlt(0, 0, nWidthDst, nHeightDst, &memDC, 0, 0, SRCCOPY);
	::DeleteObject(hBitmap);
	memDC.SelectObject(hOldBitmap);

	delete ig;
	delete[] pbyBitsDst32;
	delete[] pbyBitsSrc32;
	ReleaseDC(&dc);
}