Pixel coordinate calculation

[Aquachains]

Hello together.
First of all, thank you very much for this awesome project Chlumsky, i read your article and master thesis and tried to understand as much as possible.😅 And thanks for all contributors. 👍
So i write a 2d engine and draw every char with a rect inside a texture.

if i run this snippet:

msdfgen.exe mtsdf -font %1 'l' -scale 1 -translate 1 1 -o %~n1.0.png -size 32 32 -pxrange 2 -printmetrics -testrender render.png 1024 1024

i get as a result:

bounds = 2.75, 0, 5.34375, 24.3125
advance = 8.09375
range = 2

I need pixel values and i cant get to the real values by rounding or truncating.
Here the values i see in Gimp (Position and Size inside the red rectangle):

So the bounds should really be (3, 0, 4, 26). (Depending on the direction of the y-Axis) instead of (2.75, 0, 5.34375, 24.3125)
I tried different chars and different pixel ranges, but i cant see a pattern how to calculate those values.

Can someone help me how to work with the given values?

[Chlumsky]

The formula for pixel bounds based on shape bounds and other parameters may potentially be something along round(scale*bound+translate+-0.5*pxRange), so:

• L: round(1*2.75+1-0.5*2) = round(2.75) = 3
• B: round(1*0+1-0.5*2) = round(0) = 0
• R: round(1*5.34375+1+0.5*2) = round(7.34375) = 7, therefore width = 7-3 = 4
• T: round(1*24.3125+1+0.5*2) = round(26.3125) = 26, threfore height = 26-0 = 26

This could be wrong though, I didn't really check it.

[Aquachains]

Hello Chlumsky, i tested a few chars and it works.
Thank you very much. 👍