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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
Download Patch File Download Diff File Expand all files Collapse all files

19
lib/EpdFont/builtinFonts/notosans_14_regular.h
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@@ -7,7 +7,7 @@
#pragma once
#include "EpdFontData.h"
static const uint8_t notosans_14_regularBitmaps[61202] = {
static const uint8_t notosans_14_regularBitmaps[61391] = {
0xBD, 0xBD, 0xBD, 0x7D, 0x7D, 0x7C, 0x7C, 0x7C, 0x3C, 0x3C, 0x3C, 0x3C, 0x3C, 0x3C, 0x3C, 0x00,
0x00, 0x14, 0xBE, 0xFE, 0xBD, 0x14, 0x3E, 0x0B, 0xCF, 0x82, 0xF3, 0xD0, 0xBC, 0xF4, 0x2E, 0x3D,
0x07, 0x8B, 0x41, 0xE2, 0xC0, 0x78, 0x60, 0x09, 0x00, 0x02, 0xC0, 0x1D, 0x00, 0x00, 0x0F, 0x00,
@@ -3833,7 +3833,18 @@ static const uint8_t notosans_14_regularBitmaps[61202] = {
0x00, 0x00, 0xBC, 0x00, 0x00, 0x7D, 0x00, 0x00, 0x3E, 0x00, 0x00, 0x3F, 0x00, 0x00, 0x1F, 0xD0,
0x05, 0x07, 0xFF, 0xFE, 0x00, 0xBF, 0xFD, 0x00, 0x01, 0x40, 0x00, 0x00, 0x00, 0x7F, 0xFF, 0xFE,
0x7F, 0xFF, 0xFE, 0x15, 0x55, 0x54, 0x15, 0x55, 0x55, 0x52, 0xFF, 0xFF, 0xFF, 0xC7, 0xFF, 0xFF,
0xFF, 0x00,
0xFF, 0x00, 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_regularGlyphs[] = {
@@ -4671,6 +4682,7 @@ static const EpdGlyph notosans_14_regularGlyphs[] = {
{ 14, 27, 17, 2, 24, 95, 61032 }, // ₿
{ 12, 21, 14, 1, 16, 63, 61127 }, // ⃀
{ 15, 3, 17, 1, 12, 12, 61190 }, // −
{ 27, 28, 29, 1, 23, 189, 61202 }, // <20>
};
static const EpdUnicodeInterval notosans_14_regularIntervals[] = {
@@ -4685,13 +4697,14 @@ static const EpdUnicodeInterval notosans_14_regularIntervals[] = {
{ 0x2066, 0x206F, 0x316 },
{ 0x20A0, 0x20C0, 0x320 },
{ 0x2212, 0x2212, 0x341 },
{ 0xFFFD, 0xFFFD, 0x342 },
};
static const EpdFontData notosans_14_regular = {
notosans_14_regularBitmaps,
notosans_14_regularGlyphs,
notosans_14_regularIntervals,
11,
12,
40,
32,
-9,