Caching from dc

beva 15 days ago

Okay, as I now am the proud owner of a mip device (I'm clearly one of the mip over amoled lovers as of today), I want to use onPartialUpdate.

Is it possible to copy part of the dc or the complete dc to a buffered bitmap?

Or is the way for analog to draw on a buffered bitmap till the seconds hand needs to be drawn and than push the buffered bitmap to dc and reuse it in onPartialUpdate to restore the background of the previous seconds hand?

jim_m_58 15 days ago

look at the analog sample in the sdk

beva 14 days ago in reply to jim_m_58

I did, that's why I am asking.

jim_m_58 14 days ago in reply to beva

You'll see it uses buffered bitmaps. you get a copy of the dc, and then use that in onPatialUpdate after setting a clip region.

beva 14 days ago in reply to jim_m_58

I wonder if we are looking at the same sample, as the one I'm looking at writes to the buffered bitmap and that gets pushed to dc. I can't find a way to copy dc to a buffered bitmap.

beva 14 days ago in reply to beva

I allready build the always push buffer to bc option, it should save some battery life for amoled as well. But I'd still like to know.

jim_m_58 14 days ago in reply to beva

Look back in this forum from when onBartialUpdate/bufferedBitmap was introduces. (2017) and there are lots of threads about how this works and how that Analog sample works.

beva 14 days ago in reply to jim_m_58

I do know how that sample works, I actually allready build the proces to write to dc from the buffered bitmap. What I want to know is if it is possible to copy content from the views dc to a buffered bitmap.