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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
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28
lib/EpdFont/builtinFonts/bookerly_18_italic.h
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@@ -7,7 +7,7 @@
#pragma once
#include "EpdFontData.h"
static const uint8_t bookerly_18_italicBitmaps[108017] = {
static const uint8_t bookerly_18_italicBitmaps[108341] = {
0x00, 0x00, 0x00, 0x00, 0xBE, 0x00, 0x2F, 0xD0, 0x03, 0xFC, 0x00, 0x7F, 0x80, 0x0B, 0xF0, 0x00,
0xFF, 0x00, 0x0F, 0xE0, 0x00, 0xFC, 0x00, 0x1F, 0xC0, 0x02, 0xF8, 0x00, 0x2F, 0x40, 0x03, 0xF0,
0x00, 0x3F, 0x00, 0x03, 0xE0, 0x00, 0x7D, 0x00, 0x07, 0xC0, 0x00, 0xBC, 0x00, 0x0F, 0x80, 0x00,
@@ -6759,7 +6759,27 @@ static const uint8_t bookerly_18_italicBitmaps[108017] = {
0x50, 0x0A, 0x80, 0x00, 0x02, 0x90, 0x00, 0x01, 0xA0, 0x3F, 0xF0, 0x00, 0x1F, 0xF4, 0x00, 0x0B,
0xFC, 0x7F, 0xF0, 0x00, 0x2F, 0xF8, 0x00, 0x0F, 0xFD, 0x7F, 0xF0, 0x00, 0x2F, 0xF8, 0x00, 0x0F,
0xFD, 0x3F, 0xD0, 0x00, 0x0F, 0xF0, 0x00, 0x07, 0xF8, 0x05, 0x00, 0x00, 0x01, 0x40, 0x00, 0x00,
0x40,
0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x28, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xBE, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
0xFF, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0B, 0xFF, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x2F, 0xFF, 0xF8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xBE, 0x56, 0xFE, 0x00, 0x00, 0x00,
0x00, 0x00, 0x02, 0xE0, 0x00, 0x2F, 0x80, 0x00, 0x00, 0x00, 0x00, 0x0B, 0xC0, 0x00, 0x07, 0xE0,
0x00, 0x00, 0x00, 0x00, 0x2F, 0xC0, 0x00, 0x01, 0xF8, 0x00, 0x00, 0x00, 0x00, 0xBF, 0xD1, 0xA9,
0x00, 0xBE, 0x00, 0x00, 0x00, 0x02, 0xFF, 0xFF, 0xFF, 0xD0, 0x3F, 0x80, 0x00, 0x00, 0x0B, 0xFF,
0xFF, 0xFF, 0xF0, 0x2F, 0xE0, 0x00, 0x00, 0x2F, 0xFF, 0xFF, 0xFF, 0xF8, 0x1F, 0xF8, 0x00, 0x00,
0xBF, 0xFF, 0xFF, 0xFF, 0xFC, 0x0F, 0xFE, 0x00, 0x02, 0xFF, 0xFF, 0xFF, 0xFF, 0xFC, 0x0F, 0xFF,
0x80, 0x0B, 0xFF, 0xFF, 0xFF, 0xFF, 0xF4, 0x1F, 0xFF, 0xE0, 0x2F, 0xFF, 0xFF, 0xFF, 0xFE, 0x40,
0x1F, 0xFF, 0xF8, 0x7F, 0xFF, 0xFF, 0xFF, 0x80, 0x00, 0x3F, 0xFF, 0xFD, 0x1F, 0xFF, 0xFF, 0xF8,
0x00, 0x00, 0xFF, 0xFF, 0xF4, 0x07, 0xFF, 0xFF, 0xF8, 0x00, 0x07, 0xFF, 0xFF, 0xD0, 0x01, 0xFF,
0xFF, 0xF8, 0x00, 0xBF, 0xFF, 0xFF, 0x40, 0x00, 0x7F, 0xFF, 0xFC, 0x0B, 0xFF, 0xFF, 0xFD, 0x00,
0x00, 0x1F, 0xFF, 0xFC, 0x0F, 0xFF, 0xFF, 0xF4, 0x00, 0x00, 0x07, 0xFF, 0xFD, 0x0F, 0xFF, 0xFF,
0xD0, 0x00, 0x00, 0x01, 0xFF, 0xFE, 0x1F, 0xFF, 0xFF, 0x40, 0x00, 0x00, 0x00, 0x7F, 0xFF, 0xFF,
0xFF, 0xFD, 0x00, 0x00, 0x00, 0x00, 0x1F, 0xFF, 0xEB, 0xFF, 0xF4, 0x00, 0x00, 0x00, 0x00, 0x07,
0xFF, 0x00, 0xFF, 0xD0, 0x00, 0x00, 0x00, 0x00, 0x01, 0xFE, 0x00, 0xFF, 0x40, 0x00, 0x00, 0x00,
0x00, 0x00, 0x7F, 0x00, 0xFD, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x97, 0xF4, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x07, 0xFF, 0xD0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xFF, 0x40,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7D, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x14, 0x00, 0x00, 0x00, 0x00,
};
static const EpdGlyph bookerly_18_italicGlyphs[] = {
@@ -7491,6 +7511,7 @@ static const EpdGlyph bookerly_18_italicGlyphs[] = {
{ 22, 27, 38, 8, 27, 149, 107811 }, // ⊥
{ 6, 6, 24, 9, 13, 9, 107960 }, // ⋅
{ 32, 6, 38, 3, 13, 48, 107969 }, // ⋯
{ 36, 36, 38, 1, 32, 324, 108017 }, // <20>
};
static const EpdUnicodeInterval bookerly_18_italicIntervals[] = {
@@ -7554,13 +7575,14 @@ static const EpdUnicodeInterval bookerly_18_italicIntervals[] = {
{ 0x22A5, 0x22A5, 0x2D5 },
{ 0x22C5, 0x22C5, 0x2D6 },
{ 0x22EF, 0x22EF, 0x2D7 },
{ 0xFFFD, 0xFFFD, 0x2D8 },
};
static const EpdFontData bookerly_18_italic = {
bookerly_18_italicBitmaps,
bookerly_18_italicGlyphs,
bookerly_18_italicIntervals,
60,
61,
49,
40,
-10,