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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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19
lib/EpdFont/builtinFonts/bookerly_14_regular.h
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@@ -7,7 +7,7 @@
#pragma once
#include "EpdFontData.h"
static const uint8_t bookerly_14_regularBitmaps[62675] = {
static const uint8_t bookerly_14_regularBitmaps[62864] = {
0x1A, 0x1F, 0xCB, 0xE2, 0xF4, 0xBD, 0x2F, 0x4B, 0xC2, 0xF0, 0xBC, 0x2F, 0x07, 0xC1, 0xF0, 0x7C,
0x0F, 0x03, 0xC0, 0xF0, 0x00, 0x00, 0x00, 0x40, 0xFC, 0xBF, 0x5F, 0xC1, 0x40, 0x18, 0x06, 0x1F,
0x07, 0xCB, 0xC2, 0xF1, 0xF0, 0xBC, 0x7C, 0x1F, 0x1F, 0x07, 0xC7, 0xC1, 0xF1, 0xF0, 0x7C, 0x34,
@@ -3925,7 +3925,18 @@ static const uint8_t bookerly_14_regularBitmaps[62675] = {
0xAA, 0xA6, 0xFF, 0xFF, 0xFF, 0xFE, 0xBF, 0xFF, 0xFF, 0xFF, 0x80, 0x0A, 0x43, 0xFC, 0x3F, 0xC2,
0xF8, 0x00, 0x00, 0x0A, 0x00, 0x01, 0xA0, 0x00, 0x29, 0x0F, 0xF0, 0x01, 0xFD, 0x00, 0x2F, 0xC3,
0xFC, 0x00, 0xBF, 0x80, 0x0F, 0xF0, 0xFD, 0x00, 0x0F, 0xC0, 0x01, 0xF8, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xE0, 0x00, 0x00,
0x00, 0x00, 0x00, 0x2F, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x02, 0xFF, 0xE0, 0x00, 0x00, 0x00, 0x00,
0x2E, 0x5B, 0xE0, 0x00, 0x00, 0x00, 0x02, 0xC0, 0x02, 0xE0, 0x00, 0x00, 0x00, 0x2E, 0x00, 0x01,
0xE0, 0x00, 0x00, 0x02, 0xFC, 0x69, 0x02, 0xE0, 0x00, 0x00, 0x2F, 0xFF, 0xFF, 0x03, 0xE0, 0x00,
0x02, 0xFF, 0xFF, 0xFF, 0x0F, 0xE0, 0x00, 0x2F, 0xFF, 0xFF, 0xFC, 0x2F, 0xE0, 0x02, 0xFF, 0xFF,
0xFF, 0xF0, 0xBF, 0xE0, 0x2F, 0xFF, 0xFF, 0xFF, 0x42, 0xFF, 0xE2, 0xFF, 0xFF, 0xFE, 0x40, 0x0F,
0xFF, 0xE3, 0xFF, 0xFF, 0xC0, 0x00, 0xFF, 0xFF, 0x03, 0xFF, 0xFF, 0x00, 0x2F, 0xFF, 0xF0, 0x03,
0xFF, 0xFC, 0x0B, 0xFF, 0xFF, 0x00, 0x03, 0xFF, 0xF0, 0xBF, 0xFF, 0xF0, 0x00, 0x03, 0xFF, 0xD1,
0xFF, 0xFF, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0xFF, 0xF0, 0x00, 0x00, 0x03, 0xFF, 0xEF, 0xFF, 0x00,
0x00, 0x00, 0x03, 0xFC, 0x0F, 0xF0, 0x00, 0x00, 0x00, 0x03, 0xF0, 0x3F, 0x00, 0x00, 0x00, 0x00,
0x03, 0xD2, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x03, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0xF0,
0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
static const EpdGlyph bookerly_14_regularGlyphs[] = {
@@ -4657,6 +4668,7 @@ static const EpdGlyph bookerly_14_regularGlyphs[] = {
{ 17, 21, 29, 6, 21, 90, 62545 }, // ⊥
{ 6, 5, 18, 6, 10, 8, 62635 }, // ⋅
{ 25, 5, 29, 2, 10, 32, 62643 }, // ⋯
{ 27, 28, 29, 1, 24, 189, 62675 }, // <20>
};
static const EpdUnicodeInterval bookerly_14_regularIntervals[] = {
@@ -4720,13 +4732,14 @@ static const EpdUnicodeInterval bookerly_14_regularIntervals[] = {
{ 0x22A5, 0x22A5, 0x2D5 },
{ 0x22C5, 0x22C5, 0x2D6 },
{ 0x22EF, 0x22EF, 0x2D7 },
{ 0xFFFD, 0xFFFD, 0x2D8 },
};
static const EpdFontData bookerly_14_regular = {
bookerly_14_regularBitmaps,
bookerly_14_regularGlyphs,
bookerly_14_regularIntervals,
60,
61,
38,
31,
-8,