Visual font height is 15, not 16

[isral]

I use VS code on Windows 10. I found that block or vertical line is not connected vertically because the height is not full 16px. And I found the height is (120 - -30) / 10 = 15 from line 33591:

    <TTGlyph name="block" xMin="0" yMin="-30" xMax="80" yMax="120">
      <contour>
        <pt x="80" y="-30" on="1"/>
        <pt x="0" y="-30" on="1"/>
        <pt x="0" y="120" on="1"/>
        <pt x="80" y="120" on="1"/>
      </contour>
      <instructions><assembly>
        </assembly></instructions>
    </TTGlyph>

README.md said "8x16 font".

[mikejzx]

I think that this might be intentional. See the two screenshots below:

The second is a modified version of the font, with a larger vertical line. I personally think it looks a little out-of-place and too large

Here's the patch file of my changes if you'd like to try it out:

diff --git a/FSEX.ttx b/FSEX.ttx
index 4253408..8fce78b 100644
--- a/FSEX.ttx
+++ b/FSEX.ttx
@@ -33437,12 +33437,12 @@
         </assembly></instructions>
     </TTGlyph>

-    <TTGlyph name="bar" xMin="30" yMin="-30" xMax="50" yMax="90">
+    <TTGlyph name="bar" xMin="30" yMin="-30" xMax="50" yMax="130">
       <contour>
         <pt x="50" y="-30" on="1"/>
         <pt x="30" y="-30" on="1"/>
-        <pt x="30" y="90" on="1"/>
-        <pt x="50" y="90" on="1"/>
+        <pt x="30" y="130" on="1"/>
+        <pt x="50" y="130" on="1"/>
       </contour>
       <instructions><assembly>
         </assembly></instructions>

[iiiGerardoiii]

@isral can you post those characters in text? I'm guessing it's "│", but I'm using that character in Sublime Text and Windows Terminal and they're not showing that much spacing. Maybe these programs are using a secondary font to show that character?

Here's Sublime Text on the left, Windows Terminal on the right:

[isral]

I disabled clear-type so the screenshot doesn't have weird color.

░▒▓█ ░▒▓█ ┌┬┐ ├┼┤ └┴┘

[kika]

If this is U+2502 endpoint you are talking about it renders correctly on my system (MacOS, iTerm2)

[isral]

If this is U+2502 endpoint you are talking about it renders correctly on my system (MacOS, iTerm2)

17px on your screenshot, overlapped 1px

[kika]

This is some iTerm trickery, I guess. Look at the vertical bar, it actually goes onto the space of the next text row (the green block in the dashed selection rectangle is part of the letter on the next row). But this pixel is dimmed.

The non-solid blocks are indeed short by one pixel on the top

[kika]

Same characters in MacOS Terminal with line spacing 0.935:

Line spacing: 1 (default)

And the blocks are okay in both cases. Anyone understands what's going on here?

[jengelh]

Anyone understands what's going on here?

Like the initial comment said, the glyph (e.g. U+2599 of the somewhat older v3.02.9) is really just 150 units tall, and the font info specifies an em size of 160 (of which 130 are ascent).