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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_bolditalic.h
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@@ -7,7 +7,7 @@
#pragma once
#include "EpdFontData.h"
static const uint8_t notosans_12_bolditalicBitmaps[52863] = {
static const uint8_t notosans_12_bolditalicBitmaps[52996] = {
0x01, 0xFE, 0x02, 0xFE, 0x02, 0xFD, 0x03, 0xFC, 0x03, 0xFC, 0x03, 0xF8, 0x07, 0xF4, 0x0B, 0xF0,
0x0B, 0xF0, 0x0F, 0xE0, 0x0F, 0xD0, 0x0F, 0xC0, 0x00, 0x00, 0x00, 0x00, 0x2F, 0x00, 0x7F, 0x80,
0xBF, 0x80, 0x7F, 0x00, 0x04, 0x00, 0x2F, 0x4B, 0xD3, 0xF4, 0xFD, 0x3F, 0x0F, 0xC3, 0xE0, 0xF8,
@@ -3311,7 +3311,16 @@ static const uint8_t notosans_12_bolditalicBitmaps[52863] = {
0xFC, 0x0F, 0xE0, 0x3F, 0x82, 0xFD, 0x03, 0xFF, 0xFF, 0x40, 0x7F, 0xFF, 0x80, 0x0B, 0xFF, 0xFD,
0x00, 0xFF, 0x1F, 0xF0, 0x0F, 0xE0, 0x7F, 0x80, 0xFD, 0x03, 0xF8, 0x1F, 0xC0, 0x7F, 0x42, 0xFC,
0x1F, 0xF0, 0x3F, 0xFF, 0xFE, 0x03, 0xFF, 0xFF, 0x80, 0x3F, 0xFF, 0x90, 0x00, 0x34, 0xF0, 0x00,
0x07, 0x0E, 0x00, 0x00, 0x50, 0x40, 0x00, 0x05, 0x54, 0x3F, 0xFD, 0x7F, 0xFC, 0x7F, 0xFC,
0x07, 0x0E, 0x00, 0x00, 0x50, 0x40, 0x00, 0x05, 0x54, 0x3F, 0xFD, 0x7F, 0xFC, 0x7F, 0xFC, 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_bolditalicGlyphs[] = {
@@ -4148,6 +4157,7 @@ static const EpdGlyph notosans_12_bolditalicGlyphs[] = {
{ 18, 21, 15, -1, 21, 95, 52676 }, // ₾
{ 14, 24, 14, 0, 21, 84, 52771 }, // ₿
{ 8, 4, 8, 0, 9, 8, 52855 }, // −
{ 23, 23, 25, 1, 19, 133, 52863 }, // <20>
};
static const EpdUnicodeInterval notosans_12_bolditalicIntervals[] = {
@@ -4162,13 +4172,14 @@ static const EpdUnicodeInterval notosans_12_bolditalicIntervals[] = {
{ 0x2066, 0x206F, 0x316 },
{ 0x20A0, 0x20BF, 0x320 },
{ 0x2212, 0x2212, 0x340 },
{ 0xFFFD, 0xFFFD, 0x341 },
};
static const EpdFontData notosans_12_bolditalic = {
notosans_12_bolditalicBitmaps,
notosans_12_bolditalicGlyphs,
notosans_12_bolditalicIntervals,
11,
12,
34,
27,
-8,