*Update()

[mffl]

hi guys,

anyone has an idea what's the difference between these sdk functions?

void FullUpdate();
void SoftUpdate();
void FineUpdate();
void DynamicUpdate();

thanks

[review]

Hi mffl and welcome to the forum,

I wondered what the differences were as well, a while back but its pretty straight forward. I haven't done much programming on the pocketbook in recent months so I just recall things from the top of my head...

the e-ink displays have a ghosting effect if you dont flash them first to the inverse colour you want to set. If you run a "fullupdate" it will make a full screen refresh, flashing first mainly black and then to the desired pattern. However, that is rather annoying if you want to have something like a progress bar as in one of my apps.

The differences between soft, fine and dynamic are (without knowing now which is which, but you can easily write a small app to test it): one is without antialiasing, one just flashes the local area black and white and one just doesnt invert the screen at all, leading potentially to ghosting effects.

As I said, this is all from the top of my head. I can look it up when I get home if you still cant figure out which mode to use.

review

[MartinZ]

Hi review,

thanks for info (i did not ask, but i wondered as well...)

could you perhaps write down such good knowledge somewhere in a Wiki (isn't there one?). I would add my own experiences there as well (though I believe i haven't got so far than you so far.)

MartinZ

[pbmaniac]

One of them updates the whole page (after clearing the page first, which results in a black flashing page), another one just updates the whole page but without clearing it first (so that you will se some ghosting effects).

Besides that, there are two more modes: one that is used for updating e.g. only a certain specified region of the screen which only contains two-colored (b/w) items (e.g. menu elements). (This should be the fastest one)
And - finally - there is one more mode which does the same as the third one does, except that it updates the specified region for greyscale items (4 bit color).