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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

28
lib/EpdFont/builtinFonts/bookerly_18_bold.h
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@@ -7,7 +7,7 @@
#pragma once
#include "EpdFontData.h"
static const uint8_t bookerly_18_boldBitmaps[112410] = {
static const uint8_t bookerly_18_boldBitmaps[112734] = {
0x01, 0x54, 0x1F, 0xFC, 0x3F, 0xF8, 0x3F, 0xF8, 0x7F, 0xF4, 0x7F, 0xF4, 0x7F, 0xF0, 0x7F, 0xF0,
0x7F, 0xF0, 0x7F, 0xF0, 0x3F, 0xF0, 0x3F, 0xF0, 0x3F, 0xF0, 0x3F, 0xF0, 0x3F, 0xF0, 0x3F, 0xF0,
0x2F, 0xF0, 0x2F, 0xF0, 0x1F, 0xF0, 0x1F, 0xF0, 0x0F, 0xF0, 0x09, 0x00, 0x00, 0x00, 0x00, 0x00,
@@ -7033,7 +7033,27 @@ static const uint8_t bookerly_18_boldBitmaps[112410] = {
0x00, 0x00, 0x54, 0x00, 0x00, 0x54, 0x01, 0xFF, 0xC0, 0x00, 0xBF, 0xF0, 0x00, 0x3F, 0xF4, 0x3F,
0xFE, 0x00, 0x0F, 0xFF, 0x40, 0x0B, 0xFF, 0xC3, 0xFF, 0xF0, 0x01, 0xFF, 0xF4, 0x00, 0xBF, 0xFC,
0x3F, 0xFE, 0x00, 0x1F, 0xFF, 0x00, 0x0B, 0xFF, 0xC1, 0xFF, 0xC0, 0x00, 0xFF, 0xE0, 0x00, 0x3F,
0xF4, 0x01, 0x50, 0x00, 0x01, 0x50, 0x00, 0x00, 0x54, 0x00,
0xF4, 0x01, 0x50, 0x00, 0x01, 0x50, 0x00, 0x00, 0x54, 0x00, 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_boldGlyphs[] = {
@@ -7765,6 +7785,7 @@ static const EpdGlyph bookerly_18_boldGlyphs[] = {
{ 22, 27, 38, 8, 27, 149, 112187 }, // ⊥
{ 8, 7, 24, 8, 14, 14, 112336 }, // ⋅
{ 34, 7, 38, 2, 14, 60, 112350 }, // ⋯
{ 36, 36, 38, 1, 32, 324, 112410 }, // <20>
};
static const EpdUnicodeInterval bookerly_18_boldIntervals[] = {
@@ -7828,13 +7849,14 @@ static const EpdUnicodeInterval bookerly_18_boldIntervals[] = {
{ 0x22A5, 0x22A5, 0x2D5 },
{ 0x22C5, 0x22C5, 0x2D6 },
{ 0x22EF, 0x22EF, 0x2D7 },
{ 0xFFFD, 0xFFFD, 0x2D8 },
};
static const EpdFontData bookerly_18_bold = {
bookerly_18_boldBitmaps,
bookerly_18_boldGlyphs,
bookerly_18_boldIntervals,
60,
61,
49,
40,
-10,