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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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16
lib/EpdFont/builtinFonts/notosans_12_bold.h
View File

@@ -7,7 +7,7 @@
#pragma once
#include "EpdFontData.h"
static const uint8_t notosans_12_boldBitmaps[49639] = {
static const uint8_t notosans_12_boldBitmaps[49772] = {
0x7F, 0xAF, 0xE7, 0xF9, 0xFD, 0x7F, 0x5F, 0xD7, 0xF4, 0xFD, 0x3F, 0x0F, 0xC3, 0xF0, 0xFC, 0x00,
0x00, 0x02, 0xE2, 0xFE, 0xBF, 0x9F, 0xD0, 0x40, 0x7F, 0x0F, 0xD7, 0xF0, 0xFD, 0x7F, 0x0F, 0xC3,
0xF0, 0xFC, 0x3F, 0x0F, 0xC3, 0xE0, 0xBC, 0x29, 0x06, 0x80, 0x00, 0x0F, 0x43, 0xD0, 0x00, 0x1F,
@@ -3110,7 +3110,15 @@ static const uint8_t notosans_12_boldBitmaps[49639] = {
0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xFF, 0x00, 0x00, 0xBF, 0x40, 0x00, 0x7F,
0xC0, 0x14, 0x3F, 0xFF, 0xF8, 0x0F, 0xFF, 0xF8, 0x02, 0xFF, 0xF4, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0xFF, 0xFF, 0xFC, 0xFF, 0xFF, 0xFC, 0x55, 0x55, 0x54, 0x00, 0x00, 0x00, 0x3F, 0xFF, 0xFF,
0xDF, 0xFF, 0xFF, 0xF5, 0xAA, 0xAA, 0xA8,
0xDF, 0xFF, 0xFF, 0xF5, 0xAA, 0xAA, 0xA8, 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_boldGlyphs[] = {
@@ -3948,6 +3956,7 @@ static const EpdGlyph notosans_12_boldGlyphs[] = {
{ 12, 24, 14, 2, 21, 72, 49497 }, // ₿
{ 12, 19, 13, 1, 14, 57, 49569 }, // ⃀
{ 13, 4, 15, 1, 11, 13, 49626 }, // −
{ 23, 23, 25, 1, 19, 133, 49639 }, // <20>
};
static const EpdUnicodeInterval notosans_12_boldIntervals[] = {
@@ -3962,13 +3971,14 @@ static const EpdUnicodeInterval notosans_12_boldIntervals[] = {
{ 0x2066, 0x206F, 0x316 },
{ 0x20A0, 0x20C0, 0x320 },
{ 0x2212, 0x2212, 0x341 },
{ 0xFFFD, 0xFFFD, 0x342 },
};
static const EpdFontData notosans_12_bold = {
notosans_12_boldBitmaps,
notosans_12_boldGlyphs,
notosans_12_boldIntervals,
11,
12,
34,
27,
-8,