gdi - Draw the screen to a window using StretchBlt() -

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i'm working on program capture screen , draw on window.

this drawing thread function:

void drawfunc(void*hwnd) {     hdc windowdc=getdc((hwnd)hwnd);     hdc desktopdc=getdc(getdesktopwindow());     for(;;)     {         rect rect;         getclientrect((hwnd)hwnd,&rect);         stretchblt(windowdc,0,0,rect.right-rect.left,rect.bottom-rect.top,desktopdc,0,0,1920,1080,srccopy);     } }

the problem stretchblt slow(about 20 fps) should improve performance? thanks.


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