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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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27
lib/EpdFont/builtinFonts/notosans_18_bolditalic.h
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@@ -7,7 +7,7 @@
#pragma once
#include "EpdFontData.h"
static const uint8_t notosans_18_bolditalicBitmaps[115270] = {
static const uint8_t notosans_18_bolditalicBitmaps[115577] = {
0x00, 0x1F, 0xFE, 0x00, 0x2F, 0xFE, 0x00, 0x3F, 0xFD, 0x00, 0x3F, 0xFC, 0x00, 0x3F, 0xFC, 0x00,
0x7F, 0xF8, 0x00, 0x7F, 0xF4, 0x00, 0xBF, 0xF0, 0x00, 0xFF, 0xF0, 0x00, 0xFF, 0xE0, 0x00, 0xFF,
0xD0, 0x01, 0xFF, 0xC0, 0x02, 0xFF, 0x80, 0x02, 0xFF, 0x40, 0x03, 0xFF, 0x00, 0x03, 0xFF, 0x00,
@@ -7212,7 +7212,26 @@ static const uint8_t notosans_18_bolditalicBitmaps[115270] = {
0xFF, 0xFF, 0xFF, 0x40, 0x0B, 0xFF, 0xFF, 0xFF, 0x00, 0x03, 0xFF, 0xFF, 0xF8, 0x00, 0x00, 0x03,
0xE0, 0xF8, 0x00, 0x00, 0x00, 0xF8, 0x3E, 0x00, 0x00, 0x00, 0x3D, 0x0F, 0x40, 0x00, 0x00, 0x1A,
0x06, 0x80, 0x00, 0x00, 0x05, 0x55, 0x54, 0x2F, 0xFF, 0xFC, 0x3F, 0xFF, 0xFC, 0x3F, 0xFF, 0xF8,
0x3F, 0xFF, 0xF4, 0x15, 0x55, 0x50,
0x3F, 0xFF, 0xF4, 0x15, 0x55, 0x50, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x01, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1F, 0xE0, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x01, 0xFF, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1F, 0xFF, 0xE0, 0x00,
0x00, 0x00, 0x00, 0x00, 0x01, 0xFF, 0xFF, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1F, 0xFF, 0xFF,
0xE0, 0x00, 0x00, 0x00, 0x00, 0x01, 0xFF, 0xFA, 0xFF, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x1F, 0xE0,
0x00, 0x2F, 0xE0, 0x00, 0x00, 0x00, 0x01, 0xFC, 0x00, 0x00, 0x0F, 0xE0, 0x00, 0x00, 0x00, 0x1F,
0xF0, 0x00, 0x00, 0x1F, 0xE0, 0x00, 0x00, 0x01, 0xFF, 0xD0, 0x6A, 0x00, 0x3F, 0xE0, 0x00, 0x00,
0x1F, 0xFF, 0xDF, 0xFE, 0x00, 0xFF, 0xE0, 0x00, 0x01, 0xFF, 0xFF, 0xFF, 0xFC, 0x03, 0xFF, 0xE0,
0x00, 0x1F, 0xFF, 0xFF, 0xFF, 0xE0, 0x0F, 0xFF, 0xE0, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x7F,
0xFF, 0xE0, 0x1F, 0xFF, 0xFF, 0xFF, 0xE0, 0x03, 0xFF, 0xFF, 0xE0, 0xFF, 0xFF, 0xFF, 0xFE, 0x00,
0x3F, 0xFF, 0xFF, 0xE2, 0xFF, 0xFF, 0xFF, 0xF0, 0x07, 0xFF, 0xFF, 0xFF, 0x02, 0xFF, 0xFF, 0xFF,
0x40, 0x7F, 0xFF, 0xFF, 0xF0, 0x02, 0xFF, 0xFF, 0xFC, 0x03, 0xFF, 0xFF, 0xFF, 0x00, 0x02, 0xFF,
0xFF, 0xF0, 0x0F, 0xFF, 0xFF, 0xF0, 0x00, 0x02, 0xFF, 0xFF, 0xEA, 0xBF, 0xFF, 0xFF, 0x00, 0x00,
0x02, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 0x00, 0x00, 0x02, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00,
0x00, 0x00, 0x02, 0xFF, 0xF4, 0x0F, 0xFF, 0xF0, 0x00, 0x00, 0x00, 0x02, 0xFF, 0x80, 0x1F, 0xFF,
0x00, 0x00, 0x00, 0x00, 0x02, 0xFE, 0x00, 0x7F, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x02, 0xFC, 0x02,
0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xF9, 0x6F, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,
0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xFF, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x02, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xF0, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00,
};
static const EpdGlyph notosans_18_bolditalicGlyphs[] = {
@@ -8049,6 +8068,7 @@ static const EpdGlyph notosans_18_bolditalicGlyphs[] = {
{ 26, 31, 23, -1, 31, 202, 114866 }, // ₾
{ 21, 35, 21, 0, 31, 184, 115068 }, // ₿
{ 12, 6, 12, 0, 13, 18, 115252 }, // −
{ 35, 35, 38, 1, 29, 307, 115270 }, // <20>
};
static const EpdUnicodeInterval notosans_18_bolditalicIntervals[] = {
@@ -8063,13 +8083,14 @@ static const EpdUnicodeInterval notosans_18_bolditalicIntervals[] = {
{ 0x2066, 0x206F, 0x316 },
{ 0x20A0, 0x20BF, 0x320 },
{ 0x2212, 0x2212, 0x340 },
{ 0xFFFD, 0xFFFD, 0x341 },
};
static const EpdFontData notosans_18_bolditalic = {
notosans_18_bolditalicBitmaps,
notosans_18_bolditalicGlyphs,
notosans_18_bolditalicIntervals,
11,
12,
51,
41,
-11,