directx 透明視窗

第一步

新增類class cuimagedc

hbitmap getbmphandle(void)

dword* getbits(void)

protected:

hbitmap m_hbmp;

hdc  m_hdc;

char*   m_pbits;

};cuimagedc::cuimagedc()

cuimagedc::~cuimagedc()

void cuimagedc::create(int nwidth, int nheight)

void cuimagedc::delete()

第二步建立變數

lpdirect3dsu***ce9      g_pd3dsu***ce   = null;

cuimagedc   g_dcsu***ce;

第三步在建立好裝置後新增

if (failed(g_d3ddevice->createrendertarget(640, 480,

d3dfmt_a8r8g8b8, d3dmultisample_none, 0,

/*!g_is9ex*/false, // lockable

&g_pd3dsu***ce, null)))

g_d3ddevice->setrendertarget(0, g_pd3dsu***ce);

g_d3ddevice->setrenderstate(d3drs_cullmode, d3dcull_none);

// turn off d3d lighting to use vertex colors

g_d3ddevice->setrenderstate(d3drs_lighting, false);

// enable alpha blending.

g_d3ddevice->setrenderstate(d3drs_alphablendenable, true);

g_dcsu***ce.create(640, -480);

setwindowlong(hwnd, gwl_exstyle, (getwindowlong(hwnd, gwl_exstyle) & ~ws_ex_transparent) | ws_ex_layered);

第四步在渲染函式中新增

d3dlocked_rect lockedrect;

rect rc, rcsu***ce = ;

::getwindowrect(hwnd, &rc);

point ptwinpos = ;

point ptsrc = ;

size szwin = ;

blendfunction stblend = ;

hdc  hdcwnd = getwindowdc(hwnd);

lpdirect3dsu***ce9      g_psyssu***ce   = null;

g_d3ddevice->createoffscreenplainsu***ce(640, 480,

d3dfmt_a8r8g8b8, d3dpool_systemmem, &g_psyssu***ce, null);

g_d3ddevice->getrendertargetdata(g_pd3dsu***ce, g_psyssu***ce);

g_psyssu***ce->lockrect(&lockedrect, &rcsu***ce, d3dlock_readonly);

memcpy(g_dcsu***ce.getbits(), lockedrect.pbits, 4 * 640 * 480);

updatelayeredwindow(hwnd, hdcwnd, &ptwinpos, &szwin, g_dcsu***ce.getsafehdc(), &ptsrc, rgb(255,255,255), &stblend, ulw_alpha| ulw_colorkey);

g_psyssu***ce->unlockrect();

g_psyssu***ce->release();

完成後 窗體為透明色,  可以繪製各種無窗體的圖形和文理

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