!基于MFC的DX8程序用精灵贴图,显示出来的图片大小和原始的不相同

// D3DTestDlg.cpp : implementation file
//

#include "stdafx.h"
#include "D3DTest.h"
#include "D3DTestDlg.h"
#include "d3d8.h"
#include "d3dx8math.h"

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

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

LPDIRECT3D8            g_pD3D = NULL;
LPDIRECT3DDEVICE8    g_pDevice = NULL;
LPD3DXSPRITE        g_pSprite = NULL;
D3DPRESENT_PARAMETERS g_Present;
LPDIRECT3DTEXTURE8    g_pTexture = NULL;

class CAboutDlg : public CDialog
{
public:
    CAboutDlg();

// Dialog Data
    //{{AFX_DATA(CAboutDlg)
    enum { IDD = IDD_ABOUTBOX };
    //}}AFX_DATA

    // ClassWizard generated virtual function overrides
    //{{AFX_VIRTUAL(CAboutDlg)
    protected:
    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
    //}}AFX_VIRTUAL

// Implementation
protected:
    //{{AFX_MSG(CAboutDlg)
    //}}AFX_MSG
    DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
    //{{AFX_DATA_INIT(CAboutDlg)
    //}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialog::DoDataExchange(pDX);
    //{{AFX_DATA_MAP(CAboutDlg)
    //}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
    //{{AFX_MSG_MAP(CAboutDlg)
        // No message handlers
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CD3DTestDlg dialog

CD3DTestDlg::CD3DTestDlg(CWnd* pParent /*=NULL*/)
    : CDialog(CD3DTestDlg::IDD, pParent)
{
    //{{AFX_DATA_INIT(CD3DTestDlg)
        // NOTE: the ClassWizard will add member initialization here
    //}}AFX_DATA_INIT
    // Note that LoadIcon does not require a subsequent DestroyIcon in Win32
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CD3DTestDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialog::DoDataExchange(pDX);
    //{{AFX_DATA_MAP(CD3DTestDlg)
    DDX_Control(pDX, IDC_STA_SHOW, m_staShow);
    //}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CD3DTestDlg, CDialog)
    //{{AFX_MSG_MAP(CD3DTestDlg)
    ON_WM_SYSCOMMAND()
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_WM_TIMER()
    //}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CD3DTestDlg message handlers

BOOL CD3DTestDlg::OnInitDialog()
{
    CDialog::OnInitDialog();

    // Add "About..." menu item to system menu.

    // IDM_ABOUTBOX must be in the system command range.
    ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
    ASSERT(IDM_ABOUTBOX < 0xF000);

    CMenu* pSysMenu = GetSystemMenu(FALSE);
    if (pSysMenu != NULL)
    {
        CString strAboutMenu;
        strAboutMenu.LoadString(IDS_ABOUTBOX);
        if (!strAboutMenu.IsEmpty())
        {
            pSysMenu->AppendMenu(MF_SEPARATOR);
            pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
        }
    }

    // Set the icon for this dialog.  The framework does this automatically
    //  when the application's main window is not a dialog
    SetIcon(m_hIcon, TRUE);            // Set big icon
    SetIcon(m_hIcon, FALSE);        // Set small icon
    
    // TODO: Add extra initialization here
    this->InitD3D(m_staShow.GetSafeHwnd());
    if (FAILED(::D3DXCreateTextureFromFile(g_pDevice, "Test.bmp", &g_pTexture)))
    {
        int a = 0;
        ++a;
    }

    this->SetTimer(1001, 8, NULL);
    return TRUE;  // return TRUE  unless you set the focus to a control
}

void CD3DTestDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
    if ((nID & 0xFFF0) == IDM_ABOUTBOX)
    {
        CAboutDlg dlgAbout;
        dlgAbout.DoModal();
    }
    else
    {
        CDialog::OnSysCommand(nID, lParam);
    }
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CD3DTestDlg::OnPaint() 
{
    if (IsIconic())
    {
        CPaintDC dc(this); // device context for painting

        SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

        // Center icon in client rectangle
        int cxIcon = GetSystemMetrics(SM_CXICON);
        int cyIcon = GetSystemMetrics(SM_CYICON);
        CRect rect;
        GetClientRect(&rect);
        int x = (rect.Width() - cxIcon + 1) / 2;
        int y = (rect.Height() - cyIcon + 1) / 2;

        // Draw the icon
        dc.DrawIcon(x, y, m_hIcon);
    }
    else
    {
        CDialog::OnPaint();
    }
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CD3DTestDlg::OnQueryDragIcon()
{
    return (HCURSOR) m_hIcon;
}

bool CD3DTestDlg::InitD3D(HWND hWnd)
{
    g_pD3D = Direct3DCreate8(D3D_SDK_VERSION);
    
    HRESULT hr;
    D3DDISPLAYMODE d3ddm;
    hr = g_pD3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT, &d3ddm);
    if(FAILED(hr))
        return false;
    
    //D3DPRESENT_PARAMETERS d3dpp;
    ZeroMemory(&g_Present, sizeof(g_Present));
    g_Present.BackBufferFormat = d3ddm.Format;
    g_Present.BackBufferCount = 1;
    g_Present.MultiSampleType = D3DMULTISAMPLE_NONE;
    g_Present.SwapEffect = D3DSWAPEFFECT_DISCARD;
    g_Present.hDeviceWindow = hWnd;
    g_Present.Windowed = TRUE;
    g_Present.EnableAutoDepthStencil = TRUE;
    g_Present.AutoDepthStencilFormat = D3DFMT_D24S8;
    g_Present.Flags = 0;
    g_Present.FullScreen_RefreshRateInHz = D3DPRESENT_RATE_DEFAULT;
    //d3dpp.FullScreen_PresentationInterval = D3DPRESENT_INTERVAL_IMMEDIATE;
    
    hr = g_pD3D->CreateDevice(D3DADAPTER_DEFAULT,
        D3DDEVTYPE_HAL,
        hWnd,
        D3DCREATE_SOFTWARE_VERTEXPROCESSING,
        &g_Present,
        &g_pDevice);
    
    if(FAILED(hr))
        return false;
    
    if (FAILED(D3DXCreateSprite(g_pDevice, &g_pSprite)))
        return false;

    if (FAILED(D3DXCreateSprite(g_pDevice, &g_pSprite)))
        return false;
    
    return true;
}

void CD3DTestDlg::OnTimer(UINT nIDEvent) 
{
    // TODO: Add your message handler code here and/or call default
    if (1001 == nIDEvent)
    {
        this->OnRender();
    }
    CDialog::OnTimer(nIDEvent);
}

int CD3DTestDlg::IfDeviceLost()
{
    HRESULT hr;
    if (FAILED(hr = g_pDevice->TestCooperativeLevel()))
    {
        if (D3DERR_DEVICELOST == hr)
            return 1;
        
        if (D3DERR_DEVICENOTRESET)
            return 2;
    }
    return 0;
}

bool CD3DTestDlg::ResetDevice()
{
    if (FAILED(g_pDevice->Reset(&g_Present)))
    {
        return false;
    }
    DWORD current;
    g_pDevice->GetRenderState(D3DRS_AMBIENT, &current);
    if (current != D3DCOLOR_ARGB(255, 255, 255, 255))
        g_pDevice->SetRenderState(D3DRS_AMBIENT, D3DCOLOR_ARGB(255, 255, 255, 255));
    
    return true;
}

void CD3DTestDlg::OnRender()
{
    if (NULL == g_pDevice)
    {
        return;
    }

    int nRet = this->IfDeviceLost();
    if (nRet == 1)
    {
        return;
    }
    else if (nRet == 2)
    {

        return;
    }

    g_pDevice->BeginScene();
    g_pDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, D3DCOLOR_ARGB(255, 255, 255, 255), 1.0f, 0);

    if (g_pSprite && g_pTexture)
    {
        D3DXVECTOR2 dvTran(0.0f, 0.0f);
        g_pSprite->Draw(g_pTexture, NULL, NULL, NULL, 0.0f, &dvTran, 0xFFFFFFFF);
    }

    g_pDevice->EndScene();
    g_pDevice->Present(NULL, NULL, NULL, NULL);
}