How to eliminate flicker

gugu911

[Note]: Please speak after reading

[Purpose]: My purpose is to achieve rolling captions like Jinshanbei

[Already implemented]: I use dual buffer technology to copy the memory DC to the screen DC, to achieve a single pixel level movement.

[Now problem]: Although the single pixel moves after the program is run, it still seems to flicker.

[Analysis]: I dare to analyze, the visual frequency of the human eye is 24 frames, which means that at least 24 pixels must be moved in one second (because I moved by a single pixel), but for the elephant Jinshan back word this For this kind of software, if you move too many pixels in one second, the word moves too fast, and people haven't seen it clearly ...

[Method I have tried]: Use D3D technology (because DDraw has been canceled), draw 2D text, the situation is much better, after all, it is hardware processing, but looking at the resource manager, the CPU usage of the program runs unexpectedly It's 50% and can't stand it ...

Please brainstorm.

lcdxhj

Writing assembly code directly should be the fastest ...

lixiaof6471

Single pixel movement ?!

gugu911

TO:lixiaof6471

Refers to the pixel level movement, moving forward 1 pixel at a time

xqglory

You try the function of the middle mouse button in IE (I tried it in Firefox), in the case of multiple words, there will still be flashes, gdi is not fast enough, I said sometimes, most of the time It's fast enough. This is a doomed thing. I think if you use compilation, it's about the same CPU rate as d3d, and it seems difficult to do it if you want the horse to run and not to eat grass. In addition, the refresh rate of the computer is not 24 frames, but 30 frames. The minimum requirement for modern games is 30 to avoid flickering. In many cases of pixels, especially almost 90% of pixels like large blocks of text have to be changed, and there is no cropping technology available. Alas, this is the case, it is difficult to do not flicker. The game can do not flicker, and the cutting technique is a very important factor.
I said that, but there is no shortage of talented people, geniuses or something, and I expect someone downstairs to have genius ideas.

xqglory

Not "not blinking" but "not dropping frames"
correct!

2511718

Create a separate window, draw the text first, and then move this window.

Or you can refer to ScrollDC as a GDI function

gugu911

Thanks for the tips from friends upstairs, I hope everyone can understand what I mean :)

gugu911

TO:2511718
I think what you said will increase the window, resulting in a large number of OnPaint () calls, maybe ...
But I will try
Thank you