O>>Note Graphics drivers can improve performance by supporting bitmaps in off-screen memory and by drawing bitmaps using hardware. For an example of this, see the Permedia display driver sample.
O>>(c) https://docs.microsoft.com/en-us/windows-hardware/drivers/display/creating-device-dependent-bitmaps
O>>Если неубедительно, ...
CS>"bitmaps in off-screen memory" это и есть "картинки в памяти".
Цитата по ссылке которая висит на термине off-screen memory:

off-screen memory
Video memory whose contents do not appear on the video display. Off-screen memory can be used for double buffering, a technique in which a complex graphics image that requires numerous graphics operations can be completely rendered before it is displayed. After each image has been displayed, another image can be constructed in the same way, providing an effective way to achieve animation.

CS>а "by drawing bitmaps using hardware" это и есть как я понимаю BitBlt ускоренный ...
CS>О чём ты вообще?
Понял, надо примеры кода из DDK.