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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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18
lib/EpdFont/builtinFonts/bookerly_12_italic.h
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@@ -7,7 +7,7 @@
#pragma once
#include "EpdFontData.h"
static const uint8_t bookerly_12_italicBitmaps[48812] = {
static const uint8_t bookerly_12_italicBitmaps[48962] = {
0x00, 0x14, 0x03, 0xD0, 0x1F, 0x00, 0xF8, 0x03, 0xD0, 0x0F, 0x00, 0x7C, 0x02, 0xD0, 0x0B, 0x00,
0x3C, 0x00, 0xE0, 0x03, 0x80, 0x1D, 0x00, 0x70, 0x00, 0x00, 0x00, 0x00, 0x1D, 0x01, 0xF8, 0x07,
0xC0, 0x04, 0x00, 0x0A, 0x07, 0x0B, 0x87, 0xC3, 0xD2, 0xE0, 0xF0, 0xB4, 0x38, 0x3C, 0x0D, 0x0E,
@@ -3058,7 +3058,17 @@ static const uint8_t bookerly_12_italicBitmaps[48812] = {
0x00, 0x00, 0x2E, 0x00, 0x00, 0x00, 0xB8, 0x00, 0x00, 0x02, 0xE0, 0x00, 0x00, 0x0B, 0x80, 0x00,
0x00, 0x2E, 0x00, 0x00, 0x00, 0xB8, 0x00, 0x05, 0x56, 0xE5, 0x54, 0xBF, 0xFF, 0xFF, 0xFA, 0xFF,
0xFF, 0xFF, 0xE0, 0x10, 0xBD, 0xFE, 0xBC, 0x04, 0x00, 0x04, 0x00, 0x05, 0x1F, 0xC0, 0x0F, 0xC0,
0x0B, 0xDB, 0xF0, 0x03, 0xF0, 0x03, 0xF8, 0xF4, 0x00, 0xF8, 0x00, 0x7C,
0x0B, 0xDB, 0xF0, 0x03, 0xF0, 0x03, 0xF8, 0xF4, 0x00, 0xF8, 0x00, 0x7C, 0x00, 0x00, 0x00, 0x40,
0x00, 0x00, 0x00, 0x00, 0x00, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x7F, 0x80, 0x00, 0x00, 0x00,
0x00, 0x7F, 0xF8, 0x00, 0x00, 0x00, 0x00, 0x74, 0x1F, 0x80, 0x00, 0x00, 0x00, 0x74, 0x00, 0x78,
0x00, 0x00, 0x00, 0x7D, 0x04, 0x0B, 0x80, 0x00, 0x00, 0x7F, 0xFF, 0xE0, 0xF8, 0x00, 0x00, 0x7F,
0xFF, 0xFD, 0x2F, 0x80, 0x00, 0x7F, 0xFF, 0xFF, 0x87, 0xF8, 0x00, 0x7F, 0xFF, 0xFF, 0xE1, 0xFF,
0x80, 0x7F, 0xFF, 0xFF, 0x80, 0xBF, 0xF8, 0x2F, 0xFF, 0xF8, 0x00, 0x3F, 0xFE, 0x02, 0xFF, 0xFC,
0x00, 0xBF, 0xFE, 0x00, 0x2F, 0xFF, 0x42, 0xFF, 0xFE, 0x00, 0x02, 0xFF, 0xE2, 0xFF, 0xFE, 0x00,
0x00, 0x2F, 0xFC, 0xBF, 0xFE, 0x00, 0x00, 0x02, 0xFF, 0xFF, 0xFE, 0x00, 0x00, 0x00, 0x2F, 0xD2,
0xFE, 0x00, 0x00, 0x00, 0x02, 0xF0, 0x3E, 0x00, 0x00, 0x00, 0x00, 0x2D, 0x2E, 0x00, 0x00, 0x00,
0x00, 0x02, 0xFE, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2E, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00,
0x00, 0x00,
};
static const EpdGlyph bookerly_12_italicGlyphs[] = {
@@ -3790,6 +3800,7 @@ static const EpdGlyph bookerly_12_italicGlyphs[] = {
{ 15, 18, 25, 5, 18, 68, 48719 }, // ⊥
{ 4, 4, 16, 6, 9, 4, 48787 }, // ⋅
{ 21, 4, 25, 2, 9, 21, 48791 }, // ⋯
{ 25, 24, 25, 0, 21, 150, 48812 }, // <20>
};
static const EpdUnicodeInterval bookerly_12_italicIntervals[] = {
@@ -3853,13 +3864,14 @@ static const EpdUnicodeInterval bookerly_12_italicIntervals[] = {
{ 0x22A5, 0x22A5, 0x2D5 },
{ 0x22C5, 0x22C5, 0x2D6 },
{ 0x22EF, 0x22EF, 0x2D7 },
{ 0xFFFD, 0xFFFD, 0x2D8 },
};
static const EpdFontData bookerly_12_italic = {
bookerly_12_italicBitmaps,
bookerly_12_italicGlyphs,
bookerly_12_italicIntervals,
60,
61,
33,
27,
-7,