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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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20
lib/EpdFont/builtinFonts/notosans_14_italic.h
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@@ -7,7 +7,7 @@
#pragma once
#include "EpdFontData.h"
static const uint8_t notosans_14_italicBitmaps[65135] = {
static const uint8_t notosans_14_italicBitmaps[65324] = {
0x00, 0x3F, 0x00, 0x1F, 0x80, 0x0B, 0xD0, 0x02, 0xF0, 0x00, 0xFC, 0x00, 0x3E, 0x00, 0x0F, 0x40,
0x07, 0xC0, 0x02, 0xF0, 0x00, 0xF8, 0x00, 0x3D, 0x00, 0x0F, 0x00, 0x07, 0xC0, 0x01, 0xE0, 0x00,
0xB4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x40, 0x03, 0xF0, 0x01, 0xFC, 0x00, 0x7F, 0x00, 0x05,
@@ -4078,7 +4078,19 @@ static const uint8_t notosans_14_italicBitmaps[65135] = {
0x0B, 0xFF, 0xFD, 0x00, 0x0F, 0xC0, 0x6F, 0x80, 0x0F, 0x80, 0x0B, 0xD0, 0x0F, 0x40, 0x03, 0xE0,
0x1F, 0x00, 0x03, 0xE0, 0x2F, 0x00, 0x03, 0xE0, 0x3E, 0x00, 0x07, 0xD0, 0x3E, 0x00, 0x0F, 0xC0,
0x7D, 0x01, 0xBF, 0x40, 0x7F, 0xFF, 0xFD, 0x00, 0xBF, 0xFF, 0xD0, 0x00, 0x07, 0x4B, 0x00, 0x00,
0x0B, 0x0F, 0x00, 0x00, 0x0E, 0x0E, 0x00, 0x00, 0x3F, 0xFF, 0x0F, 0xFF, 0xC1, 0x55, 0x50,
0x0B, 0x0F, 0x00, 0x00, 0x0E, 0x0E, 0x00, 0x00, 0x3F, 0xFF, 0x0F, 0xFF, 0xC1, 0x55, 0x50, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xD0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0F,
0xD0, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xD0, 0x00, 0x00, 0x00, 0x00, 0x0F, 0xFF, 0xD0, 0x00,
0x00, 0x00, 0x00, 0xFF, 0xFF, 0xD0, 0x00, 0x00, 0x00, 0x0F, 0xE9, 0x6F, 0xD0, 0x00, 0x00, 0x00,
0xF4, 0x00, 0x0F, 0xD0, 0x00, 0x00, 0x0F, 0xC0, 0x00, 0x0F, 0xD0, 0x00, 0x00, 0xFF, 0x86, 0xE0,
0x2F, 0xD0, 0x00, 0x0F, 0xFF, 0xFF, 0xC0, 0x7F, 0xD0, 0x00, 0xFF, 0xFF, 0xFF, 0x02, 0xFF, 0xD0,
0x0F, 0xFF, 0xFF, 0xF4, 0x0F, 0xFF, 0xD0, 0xFF, 0xFF, 0xFF, 0x40, 0xBF, 0xFF, 0xD7, 0xFF, 0xFF,
0xF4, 0x0B, 0xFF, 0xFF, 0x87, 0xFF, 0xFF, 0x80, 0xFF, 0xFF, 0xF8, 0x07, 0xFF, 0xFE, 0x07, 0xFF,
0xFF, 0x80, 0x07, 0xFF, 0xF8, 0x2F, 0xFF, 0xF8, 0x00, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x00,
0x07, 0xFF, 0xFF, 0xFF, 0xF8, 0x00, 0x00, 0x07, 0xFD, 0x07, 0xFF, 0x80, 0x00, 0x00, 0x07, 0xF0,
0x0F, 0xF8, 0x00, 0x00, 0x00, 0x07, 0xD0, 0x3F, 0x80, 0x00, 0x00, 0x00, 0x07, 0xD7, 0xF8, 0x00,
0x00, 0x00, 0x00, 0x07, 0xFF, 0x80, 0x00, 0x00, 0x00, 0x00, 0x07, 0xF8, 0x00, 0x00, 0x00, 0x00,
0x00, 0x07, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00,
};
static const EpdGlyph notosans_14_italicGlyphs[] = {
@@ -4915,6 +4927,7 @@ static const EpdGlyph notosans_14_italicGlyphs[] = {
{ 20, 24, 17, -1, 24, 120, 64900 }, // ₾
{ 16, 27, 16, 1, 24, 108, 65020 }, // ₿
{ 9, 3, 9, 0, 9, 7, 65128 }, // −
{ 27, 28, 29, 1, 23, 189, 65135 }, // <20>
};
static const EpdUnicodeInterval notosans_14_italicIntervals[] = {
@@ -4929,13 +4942,14 @@ static const EpdUnicodeInterval notosans_14_italicIntervals[] = {
{ 0x2066, 0x206F, 0x316 },
{ 0x20A0, 0x20BF, 0x320 },
{ 0x2212, 0x2212, 0x340 },
{ 0xFFFD, 0xFFFD, 0x341 },
};
static const EpdFontData notosans_14_italic = {
notosans_14_italicBitmaps,
notosans_14_italicGlyphs,
notosans_14_italicIntervals,
11,
12,
40,
32,
-9,