Added fixed fat font glyphs X and 2 screenshots

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michaelangel007 2016-01-28 10:02:00 -08:00
parent f17bf393f7
commit c5d98dfd24

133
README.md
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@ -1,6 +1,6 @@
#Apple ]\[ //e HGR Font 6502 Assembly Language Tutorial
Revision: 62, Jan 28, 2016.
Revision: 63, Jan 28, 2016.
# Table of Contents
@ -2517,7 +2517,7 @@ OK, that's much better.
![Screenshot ASCII Table Font BB Upside Down](pics/ascii_table_3_fontbb.png?raw=true)
Hmmm, some of those glyphs are badly designed (inconsistent.) :-/ That's the biggest problem amateur artists have; they haven't yet internalized a "consistent style" -- their's is all over the place. This comes with experience of knowing:
Hmmm, some of those glyphs are badly designed (inconsistent.) :-/ That's the biggest problem amateur artists have; they haven't yet internalized a "consistent style" -- theirs is all over the place. This comes with experience of knowing:
* When to follow the "rules", and
* When to bend/break the "rules".
@ -2551,13 +2551,13 @@ Change the `S` = $53 @ `6298`:
From:
```
6298:80 9E B3 B0 9E 83 B3 9E 'S
6298:80 9E B3 B0 9E 83 B3 9E
```
To:
```
6298:80 9E BF B8 9E 87 BF 9E 'S
6298:80 9E BF B8 9E 87 BF 9E
```
Let's display our new glyphs at row 12.
@ -2571,10 +2571,10 @@ Let's display our new glyphs at row 12.
While that matches the style of `5` it doesn't match the style of `A`.
Let's fix the and bottom rows.
Let's fix the top and bottom rows.
```
6298:80 9F BF B8 9E 87 BF BE 'S
6298:80 9F BF B8 9E 87 BF BE
```
![Screenshot ASCII Table Font BB S3](pics/ascii_table_s3_fontbb.png?raw=true)
@ -2654,7 +2654,128 @@ b) Did I manually enter in those hex values?
`<<Forthcoming!>>`
The next glyph that stands out is the `X`.
Change the `X` = $53 @ `6298`:
From:
```
62C0:80 B3 B3 9E 8C 9E B3 B3
```
To:
```
62C0:80 33 B3 9E 8C 9E B3 33
```
![Screenshot ASCII Table Font BB X2](pics/ascii_table_x2_fontbb.png?raw=true)
Hmm. Close, but no cigar. We need to shift the top and bottom row's right edge pixels over by 1 pixel:
```
XxXx....XxXx
xXxX....xXxX
xXxXxXxX
xXxX
xXxXxXxX
xXxX....xXxX
XxXx....XxXx
```
```
XxXx......XxXx
xXxX....xXxX
xXxXxXxX
xXxX
xXxXxXxX
xXxX....xXxX
XxXx......XxXx
```
OK, this should fix it:
```
62C0:80 63 B3 9E 8C 9E B3 63
```
![Screenshot ASCII Table Font BB X3](pics/ascii_table_x3_fontbb.png?raw=true)
Hmm, that's not really an improvement -- we lost our symmetry. Let's review with-out the half-pixel shift.
```
XX..XX 1
XX..XX 2
XXXX 3
XX 4
XXXX 5
XX XX 6
XX..XX 7
```
We really want the top and rows "anchored" and nudge rows 2 and 6 in half a pixel
From:
```
62C0:80 B3 B3 9E 8C 9E B3 63
```
To:
```
62C0:80 B3 9B 9E 8C 9E 9B B3
```
![Screenshot ASCII Table Font BB X4](pics/ascii_table_x4_fontbb.png?raw=true)
Ugh! That's even worse!
Why?
Because all the other rows are already half-pixel shifted over -- let's "undo" that for this glyph:
```
62C0:80 33 9B 1E 0C 1E 9B 33
```
![Screenshot ASCII Table Font BB X5](pics/ascii_table_x5_fontbb.png?raw=true)
Almost!
We just need to add 1/2 a pixel on the left edge and 1/2 a pixel on the right edge of the middle row 4.
```
62C0:80 33 9B 1E 8E 1E 9B 33
```
![Screenshot ASCII Table Font BB X6](pics/ascii_table_x6_fontbb.png?raw=true)
![Screenshot ASCII Table Font BB X7](pics/ascii_table_x7_fontbb.png?raw=true)
Looking good!
Except we have one minor problem -- the "kerning" between the `W` and `X` versus the `X` and `Y` is no longer consistent.
Why?
This is because all the glyphs in the font has the high-bit ON which means every glyph is half-pixel shifted to the right.
In order to fix this we need to "undo" ALL these half pixel shifts -- all we need to do is subtract `$80`, or better yet `XOR $80` from every byte.
We can either do this now, or fix the other glyphs and do this later.
Let's touch up the `2` and `Q` first.
We want to fix row 4 of the `2`:
6190:80 BF BF 8E 38 B3 BF 9E
Excellent!
![Screenshot ASCII Table Font BB 2b](pics/ascii_table_2b_fontbb.png?raw=true)
![Screenshot ASCII Table Font BB 2c](pics/ascii_table_2c_fontbb.png?raw=true)
# What's next?