[Lazarus] New high DPI features in 1.7

[Erwin van den Bosch]

Op 9-12-2016 om 12:41 schreef Ondrej Pokorny via Lazarus:
>
>> When you introduce DPI of a screen and scaling you lost the pixel 
>> perfect drawing too. :(
>
> No :)
>
>> Example: scaling from 96 to 120 dpi = x 1.25
>> So 7 px * 1.25 = 8.75 = 9
>>     21 px * 1.25 = 26.25 = 26
>>     22 px * 1.25 = 27.5 = 28
>> How to get pixel 27?
>
> Easily - use pixel value 27 after scaling.
>
> Ondrej

I'm sorry, don't getting it. You design on a 96 dpi screen. So you have 
pixel 20, 21, 22 etc. There is no such thing as pixel 21.5. When you 
scale you always get rounding errors.

Am I missing something?

Luckily, when everyone has a 4k (or more) screen, nobody can see that 
you one pixel of. So the non pixel perfect will be a non issue in the 
upcoming future. :)

Erwin