Hello List,
i will start this thread to found a good way to implementet the K4,
..K8 screen support aka "Retina Display".
Basicly BeOS and Haiku works with pixel in a pixel matrix without add
value "px"
BRect (0, 0, 100, 300) and not BRect( 0px, 0px, 100px, 300px), so this
make it good for a implementation he work automaticly to scale from
pixel to dip.
A simpel calculation are
PIXEL / DEVICE_PIXEL_RATIO = DIP
PIXEL = DIP * DEVICE_PIXEL_RATIO
So we can implements two helper function as privat app_server code ig:
float PixelToDpi(pixel)
{
// PIXEL / DEVICE_PIXEL_RATIO = DIP
return new_pixel_dip;
}
float DpiToPixel(dip)
{
// PIXEL = DIP * DEVICE_PIXEL_RATIO
return new_dip_pixel;
}
I found some information, i hope it help. the question is how smart
can we implementet this without braking the API and for automaticly
scaled.
http://blog.qt.digia.com/blog/2013/04/25/retina-display-support-for-mac-os-ios-and-x11/
https://www.brandbuilderwebsites.com/blog/2012/03/29/device-independent-pixel-formula-for-mobile-devices/
https://bbs.archlinux.org/viewtopic.php?id=39665
https://developer.appcelerator.com/question/125317/calculate-apps-density-pixel-width--height-using-titaniumplatformdisplaycapsdpi
