DirectShow video line and output text

 

For convenience, it is directly displayed on the video, without dynamic output text and moving the line with the mouse, but it is the same principle, but dynamic needs to capture the mouse status message

Long CX, Cy; hresult hr; HR = PwC-> getnativevideosize (& CX, & cy, null, null); If (failed (HR )) {MSG (text ("getnativevideosize failed! HR = 0x % x \ r \ n "), HR); Return hr;} HDC = getdc (hwndapp); HDC hdcbmp = createcompatibledc (HDC ); g_hfont = createfont (30, 10, 0, 0, 10, false, default_charset, out_default_precis, clip_default_precis, default_quality, default_pitch, _ T (" ")); hfont holdfont = (hfont) SelectObject (hdcbmp, g_hfont); Hpen = createpen (ps_solid, 1, RGB (255, 0, 0); Hpen holdpen = (Hpen) SelectObject (hdcbmp, hpen); int nlength, Ntextbmpwidth, ntextbmpheight; size SZ = {0}; nlength = (INT) _ tcslen (sznewtext); gettextextentpoint32 (hdcbmp, sznewtext, nlength, & sz); ntextbmpheight =. cy; ntextbmpwidth = 400/* Sz. CX */; hbitmap HBM = createcompatiblebitmap (HDC, ntextbmpwidth, callback); releasedc (hwndapp, HDC); bitmap bm; hbitmap hbmold; GetObject (HBM, sizeof (BM ), & BM); hbmold = (hbitmap) SelectObject (hdcbmp, HBM); rect rctext; setre CT (& rctext, 0, 0, ntextbmpwidth, ntextbmpheight); setbkmode (hdcbmp, transparent); // set the transparent background settextcolor (hdcbmp, g_rgbcolors ); // text color: hbrush = (hbrush) getstockobject (null_brush); SelectObject (hdcbmp, hbrush); // draw a picture on the in-place graph // output text // textout (hdcbmp, 0, 0, sznewtext, nlength); drawtext (hdcbmp, sznewtext, sizeof (sznewtext), & rctext, dt_right); // draw lines movetoex (hdcbmp, 10, 10, null ); lineto (hdcbmp, 200,10); // ellipse (hdcb MP, 0, 0, 100, ntextbmpheight); // configure the vmr's bitmap structurevmralphabitmap BMP Info; zeromemory (& BMP info, sizeof (BMP info); BMP info. dwflags = vmrbitmap_hdc; BMP info. HDC = hdcbmp; g_nimagewidth = BM. bmwidth; g_fbitmapcompwidth = (float) g_nimagewidth/(float) CX; BMP info. rdest. left = 0.0f + x_edge_buffer; BMP info. rdest. right = 1.0f-x_edge_buffer; BMP info. rdest. top = (float) (Cy-BM. bmheight)/(flo At) cy-y_edge_buffer; BMP info. rdest. bottom = 1.0f-y_edge_buffer; BMP info. rsrc = rctext; BMP info. falpha = transparency_value; setcolorref (BMP info); HR = pbmp-> setalphabitmap (& BMP info); If (failed (HR) MSG (text ("setalphabitmap failed! HR = 0x % x \ r \ n % s \ 0 "), HR, str_vmr_display_warning ); // select the initial objects back into our device contextdeleteobject (SelectObject (hdcbmp, hbmold); deleteobject (SelectObject (hdcbmp, holdpen); SelectObject (HDC, holdfont ); deleteobject (HBM); deletedc (hdcbmp); Return hr;