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Fix font readability by expanding blacks and trimming whites (#55)

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## Summary

* Previously, only pure black pixels in the font were marked as black,
this expands the black range, and makes the lightest pixels white

## Additional Context

* Noticed personally it was kind of "thin" and washed out a bit, this
massively helps, should also address concerns raised here:
https://github.com/daveallie/crosspoint-reader/discussions/39
This commit is contained in:
Dave Allie
2025-12-18 21:39:13 +11:00
committed by GitHub
parent 063a1df851
commit 5e1694748c
10 changed files with 18016 additions and 19335 deletions
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10
lib/EpdFont/scripts/fontconvert.py
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@@ -176,7 +176,7 @@ for i_start, i_end in intervals:
px = 0
if is2Bit:
# 0 = white, 15 black, 8+ dark grey, 7- light grey
# 0-3 white, 4-7 light grey, 8-11 dark grey, 12-15 black
# Downsample to 2-bit bitmap
pixels2b = []
px = 0
@@ -187,11 +187,11 @@ for i_start, i_end in intervals:
bm = pixels4g[y * pitch + (x // 2)]
bm = (bm >> ((x % 2) * 4)) & 0xF
if bm == 15:
if bm >= 12:
px += 3
elif bm >= 8:
px += 2
elif bm > 0:
elif bm >= 4:
px += 1
if (y * bitmap.width + x) % 4 == 3:
@@ -211,7 +211,7 @@ for i_start, i_end in intervals:
# print(line)
# print('')
else:
# Downsample to 1-bit bitmap - treat any non-zero as black
# Downsample to 1-bit bitmap - treat any 2+ as black
pixelsbw = []
px = 0
pitch = (bitmap.width // 2) + (bitmap.width % 2)
@@ -219,7 +219,7 @@ for i_start, i_end in intervals:
for x in range(bitmap.width):
px = px << 1
bm = pixels4g[y * pitch + (x // 2)]
px += 1 if ((x & 1) == 0 and bm & 0xF > 0) or ((x & 1) == 1 and bm & 0xF0 > 0) else 0
px += 1 if ((x & 1) == 0 and bm & 0xE > 0) or ((x & 1) == 1 and bm & 0xE0 > 0) else 0
if (y * bitmap.width + x) % 8 == 7:
pixelsbw.append(px)