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fix: Prepare SD card font caches from txt reader (#1973)

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## Summary

SD card font fixes:
- `TxtReaderActivity` needs to call `renderer.ensureSdCardFontReady` to
build the advance lookup table to support rendering with SD card fonts.
This revealed that `TxtReaderActivity` was inconsistently performing
layout with `getTextWidth`, when the renderer actually uses
`getTextAdvanceX`, which can lead to minor inconsistencies in alignment.
- Avoid allocating one big `allText` string in
`ParsedText::layoutAndExtractLines`. Instead, pass the vector of word
strings directly to `SdCardFont::buildAdvanceTable`, where the algorithm
just needs to iterate codepoints anyway.

---

### AI Usage

While CrossPoint doesn't have restrictions on AI tools in contributing,
please be transparent about their usage as it
helps set the right context for reviewers.

Did you use AI tools to help write this code? _**PARTIALLY**_

---------

Co-authored-by: Justin Mitchell <justin@jmitch.com>
This commit is contained in:
Zach Nelson
2026-05-15 09:50:41 -05:00
committed by GitHub
co-authored by Justin Mitchell
parent 5fa5a71ba2
commit b186529120
6 changed files with 126 additions and 90 deletions
Download Patch File Download Diff File Expand all files Collapse all files
lib/GfxRenderer/GfxRenderer.cpp
+12 -1
View File
@@ -53,11 +53,22 @@ const uint8_t* GfxRenderer::getGlyphBitmap(const EpdFontData* fontData, const Ep
void GfxRenderer::ensureSdCardFontReady(int fontId, const char* utf8Text, uint8_t styleMask) const {
auto it = sdCardFonts_.find(fontId);
if (it != sdCardFonts_.end()) {
int missed = it->second->buildAdvanceTable(utf8Text, styleMask);
if (missed > 0) {
LOG_DBG("GFX", "ensureSdCardFontReady: %d glyph(s) not found", missed);
}
}
}
void GfxRenderer::ensureSdCardFontReady(int fontId, const std::vector<std::string>& words, bool includeHyphen,
uint8_t styleMask) const {
auto it = sdCardFonts_.find(fontId);
if (it != sdCardFonts_.end()) {
// Augment the persistent advance-only table for layout measurement.
// The table survives across paragraphs/sections (capped per font), so
// repeated indexing of the same SD font amortizes glyph-metric SD reads.
int missed = it->second->buildAdvanceTable(utf8Text, styleMask);
int missed = it->second->buildAdvanceTable(words, includeHyphen, styleMask);
if (missed > 0) {
LOG_DBG("GFX", "ensureSdCardFontReady: %d glyph(s) not found", missed);
}