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fix: render U+FFFD replacement character instead of ? (#366)

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The current behavior of rendering `?` for an unknown Unicode character
can be hard to distinguish from a typo. Use the standard Unicode
"replacement character" instead, that's what it's designed for:

https://en.wikipedia.org/wiki/Specials_(Unicode_block)

I'm making this PR as a draft because I'm not sure I did everything that
was needed to change the character set covered by the fonts. Running
that script is in its own commit. If this is proper, I'll rebase/squash
into one commit and un-draft.

Co-authored-by: Maeve Andrews <maeve@git.mail.maeveandrews.com>
This commit is contained in:
Maeve Andrews
2026-01-19 05:58:43 -06:00
committed by GitHub
parent 7a792a5384
commit 5fef99c641
37 changed files with 620 additions and 100 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
lib/EpdFont/builtinFonts/notosans_16_regular.h
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@@ -7,7 +7,7 @@
#pragma once
#include "EpdFontData.h"
static const uint8_t notosans_16_regularBitmaps[78480] = {
static const uint8_t notosans_16_regularBitmaps[78728] = {
0x3F, 0x0F, 0xC3, 0xF0, 0xFC, 0x3F, 0x0F, 0xC3, 0xF0, 0xFC, 0x3F, 0x0F, 0xC3, 0xF0, 0xF8, 0x2E,
0x0B, 0x82, 0xE0, 0xB8, 0x2D, 0x01, 0x00, 0x00, 0x00, 0x3F, 0x2F, 0xDB, 0xF9, 0xFC, 0x04, 0x00,
0xBC, 0x0B, 0xDB, 0xC0, 0xBD, 0xBC, 0x0B, 0xDB, 0xC0, 0x7C, 0xBC, 0x07, 0xC7, 0xC0, 0x7C, 0x7C,
@@ -4913,6 +4913,22 @@ static const uint8_t notosans_16_regularBitmaps[78480] = {
0x2F, 0x80, 0x00, 0x01, 0xFD, 0x00, 0x00, 0x0B, 0xF9, 0x06, 0xD0, 0x2F, 0xFF, 0xFD, 0x00, 0x7F,
0xFF, 0x80, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x01, 0x55, 0x55, 0x54, 0x3F, 0xFF, 0xFF, 0xE3,
0xFF, 0xFF, 0xFD, 0x7F, 0xFF, 0xFF, 0xFF, 0x5F, 0xFF, 0xFF, 0xFF, 0xD1, 0x55, 0x55, 0x55, 0x50,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0D, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0xFD, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0xFD, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0xFF, 0xFD, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F, 0xFF, 0xFD, 0x00, 0x00, 0x00, 0x00,
0x00, 0xFF, 0xFF, 0xFD, 0x00, 0x00, 0x00, 0x00, 0x0F, 0xE4, 0x06, 0xFD, 0x00, 0x00, 0x00, 0x00,
0xF8, 0x00, 0x00, 0xFD, 0x00, 0x00, 0x00, 0x0F, 0xE0, 0x00, 0x00, 0xFD, 0x00, 0x00, 0x00, 0xFF,
0xC1, 0xA8, 0x03, 0xFD, 0x00, 0x00, 0x0F, 0xFF, 0xBF, 0xF4, 0x0B, 0xFD, 0x00, 0x00, 0xFF, 0xFF,
0xFF, 0xE0, 0x2F, 0xFD, 0x00, 0x0F, 0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0xFD, 0x00, 0xFF, 0xFF, 0xFF,
0xF0, 0x07, 0xFF, 0xFD, 0x0F, 0xFF, 0xFF, 0xFF, 0x00, 0x7F, 0xFF, 0xFD, 0x3F, 0xFF, 0xFF, 0xF0,
0x07, 0xFF, 0xFF, 0xF4, 0x3F, 0xFF, 0xFF, 0x80, 0xBF, 0xFF, 0xFF, 0x40, 0x3F, 0xFF, 0xFD, 0x03,
0xFF, 0xFF, 0xF4, 0x00, 0x3F, 0xFF, 0xF4, 0x1F, 0xFF, 0xFF, 0x40, 0x00, 0x3F, 0xFF, 0xFF, 0xFF,
0xFF, 0xF4, 0x00, 0x00, 0x3F, 0xFF, 0xFF, 0xFF, 0xFF, 0x40, 0x00, 0x00, 0x3F, 0xFF, 0x5B, 0xFF,
0xF4, 0x00, 0x00, 0x00, 0x3F, 0xF0, 0x0F, 0xFF, 0x40, 0x00, 0x00, 0x00, 0x3F, 0xC0, 0x2F, 0xF4,
0x00, 0x00, 0x00, 0x00, 0x3F, 0x00, 0xFF, 0x40, 0x00, 0x00, 0x00, 0x00, 0x3F, 0x5B, 0xF4, 0x00,
0x00, 0x00, 0x00, 0x00, 0x3F, 0xFF, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x3F, 0xF4, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x3F, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x34, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
static const EpdGlyph notosans_16_regularGlyphs[] = {
@@ -5750,6 +5766,7 @@ static const EpdGlyph notosans_16_regularGlyphs[] = {
{ 15, 32, 19, 3, 28, 120, 78263 }, // ₿
{ 14, 24, 16, 1, 19, 84, 78383 }, // ⃀
{ 17, 3, 19, 1, 13, 13, 78467 }, // −
{ 31, 32, 33, 1, 26, 248, 78480 }, // <20>
};
static const EpdUnicodeInterval notosans_16_regularIntervals[] = {
@@ -5764,13 +5781,14 @@ static const EpdUnicodeInterval notosans_16_regularIntervals[] = {
{ 0x2066, 0x206F, 0x316 },
{ 0x20A0, 0x20C0, 0x320 },
{ 0x2212, 0x2212, 0x341 },
{ 0xFFFD, 0xFFFD, 0x342 },
};
static const EpdFontData notosans_16_regular = {
notosans_16_regularBitmaps,
notosans_16_regularGlyphs,
notosans_16_regularIntervals,
11,
12,
45,
36,
-10,