问题
just to save some time, probably anybody tried this or saw somewhere related info.
asking about DirectDraw and not about DirectX because I need to support Win2000 and up, and I cannot install DirectX on target PC
回答1:
tried capturing by Direct3D and compared with GDI way. Results are not unambiguous. On my Win7 x64 with rather good video card D3D way shows ~2 times performance boost. On my WinXP 32bits laptop with not-integrated but old video card D3D works much much much longer. On another WinXP (I don't know any hardware details) D3D works almost 2 times slower.
来源：https://stackoverflow.com/questions/4975312/is-screenshotting-by-directdraw-faster-than-gdi-way