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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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17
lib/EpdFont/builtinFonts/notosans_12_italic.h
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@@ -7,7 +7,7 @@
#pragma once
#include "EpdFontData.h"
static const uint8_t notosans_12_italicBitmaps[48397] = {
static const uint8_t notosans_12_italicBitmaps[48530] = {
0x00, 0xB8, 0x03, 0xE0, 0x0F, 0x40, 0x7C, 0x02, 0xF0, 0x0F, 0x80, 0x3D, 0x00, 0xF0, 0x07, 0xC0,
0x1E, 0x00, 0xB4, 0x03, 0xC0, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x0F, 0x40, 0x7E, 0x01, 0xF4, 0x01,
0x00, 0x00, 0x1E, 0x0F, 0x0B, 0x87, 0xC2, 0xD1, 0xE0, 0xF0, 0xB4, 0x38, 0x2C, 0x0D, 0x0E, 0x02,
@@ -3032,7 +3032,16 @@ static const uint8_t notosans_12_italicBitmaps[48397] = {
0x0F, 0x00, 0x2E, 0x07, 0xC0, 0x0B, 0x82, 0xE0, 0x07, 0xC0, 0xF9, 0x5B, 0xD0, 0x3F, 0xFF, 0x80,
0x0F, 0xAB, 0xF4, 0x07, 0xC0, 0x1F, 0x02, 0xE0, 0x03, 0xD0, 0xF4, 0x00, 0xF8, 0x3C, 0x00, 0x3D,
0x0F, 0x00, 0x1F, 0x07, 0xC0, 0x1F, 0x82, 0xFF, 0xFF, 0x80, 0xFF, 0xFE, 0x40, 0x03, 0x8B, 0x00,
0x00, 0xD3, 0x80, 0x00, 0x10, 0x40, 0x00, 0x2A, 0xA8, 0xFF, 0xE1, 0x55, 0x00,
0x00, 0xD3, 0x80, 0x00, 0x10, 0x40, 0x00, 0x2A, 0xA8, 0xFF, 0xE1, 0x55, 0x00, 0x00, 0x00, 0x03,
0x00, 0x00, 0x00, 0x00, 0x00, 0x3F, 0x00, 0x00, 0x00, 0x00, 0x03, 0xFF, 0x00, 0x00, 0x00, 0x00,
0x3F, 0xFF, 0x00, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x3D, 0x00, 0x2F, 0x00, 0x00,
0x03, 0xE0, 0x00, 0x2F, 0x00, 0x00, 0x3F, 0xC6, 0xD0, 0x7F, 0x00, 0x03, 0xFF, 0xFF, 0xC1, 0xFF,
0x00, 0x3F, 0xFF, 0xFE, 0x07, 0xFF, 0x03, 0xFF, 0xFF, 0xE0, 0x3F, 0xFF, 0x2F, 0xFF, 0xFE, 0x03,
0xFF, 0xFE, 0x3F, 0xFF, 0xF0, 0x3F, 0xFF, 0xF0, 0x3F, 0xFF, 0x82, 0xFF, 0xFF, 0x00, 0x3F, 0xFF,
0x5F, 0xFF, 0xF0, 0x00, 0x3F, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x3F, 0xF5, 0xFF, 0xF0, 0x00, 0x00,
0x3F, 0x41, 0xFF, 0x00, 0x00, 0x00, 0x3D, 0x07, 0xF0, 0x00, 0x00, 0x00, 0x3E, 0xBF, 0x00, 0x00,
0x00, 0x00, 0x3F, 0xF0, 0x00, 0x00, 0x00, 0x00, 0x3F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x20, 0x00,
0x00, 0x00,
};
static const EpdGlyph notosans_12_italicGlyphs[] = {
@@ -3869,6 +3878,7 @@ static const EpdGlyph notosans_12_italicGlyphs[] = {
{ 17, 21, 15, -1, 21, 90, 48223 }, // ₾
{ 13, 24, 14, 1, 21, 78, 48313 }, // ₿
{ 7, 3, 8, 0, 8, 6, 48391 }, // −
{ 23, 23, 25, 1, 19, 133, 48397 }, // <20>
};
static const EpdUnicodeInterval notosans_12_italicIntervals[] = {
@@ -3883,13 +3893,14 @@ static const EpdUnicodeInterval notosans_12_italicIntervals[] = {
{ 0x2066, 0x206F, 0x316 },
{ 0x20A0, 0x20BF, 0x320 },
{ 0x2212, 0x2212, 0x340 },
{ 0xFFFD, 0xFFFD, 0x341 },
};
static const EpdFontData notosans_12_italic = {
notosans_12_italicBitmaps,
notosans_12_italicGlyphs,
notosans_12_italicIntervals,
11,
12,
34,
27,
-8,