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fix: Correct word width and space calculations (#963)

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## Summary

**What is the goal of this PR?**

This change fixes an issue I noticed while reading where occasionally,
especially in italics, some words would have too much space between
them. The problem was that word width calculations were including any
negative X overhang, and combined with a space before the word, that can
lead to an inconsistently large space.

## Additional Context

Screenshots of some problematic text:

| In CrossPoint 1.0 | With this change |
| -- | -- |
| <img
src="https://github.com/user-attachments/assets/87bf0e4b-341f-4ba9-b3ea-38c13bd26363"
width="400" /> | <img
src="https://github.com/user-attachments/assets/bf11ba20-c297-4ce1-aa07-43477ef86fc2"
width="400" /> |

---

### 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? _**NO**_
This commit is contained in:
Zach Nelson
2026-02-19 03:44:07 -06:00
committed by GitHub
parent 6be4413c97
commit f1740dbe1e
4 changed files with 13 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
lib/Epub/Epub/ParsedText.cpp
View File

@@ -29,15 +29,17 @@ void stripSoftHyphensInPlace(std::string& word) {
}
}
// Returns the rendered width for a word while ignoring soft hyphen glyphs and optionally appending a visible hyphen.
// Returns the advance width for a word while ignoring soft hyphen glyphs and optionally appending a visible hyphen.
// Uses advance width (sum of glyph advances) rather than bounding box width so that italic glyph overhangs
// don't inflate inter-word spacing.
uint16_t measureWordWidth(const GfxRenderer& renderer, const int fontId, const std::string& word,
const EpdFontFamily::Style style, const bool appendHyphen = false) {
if (word.size() == 1 && word[0] == ' ' && !appendHyphen) {
return renderer.getSpaceWidth(fontId);
return renderer.getSpaceWidth(fontId, style);
}
const bool hasSoftHyphen = containsSoftHyphen(word);
if (!hasSoftHyphen && !appendHyphen) {
return renderer.getTextWidth(fontId, word.c_str(), style);
return renderer.getTextAdvanceX(fontId, word.c_str(), style);
}
std::string sanitized = word;
@@ -47,7 +49,7 @@ uint16_t measureWordWidth(const GfxRenderer& renderer, const int fontId, const s
if (appendHyphen) {
sanitized.push_back('-');
}
return renderer.getTextWidth(fontId, sanitized.c_str(), style);
return renderer.getTextAdvanceX(fontId, sanitized.c_str(), style);
}
} // namespace

2
lib/Epub/Epub/blocks/TextBlock.cpp
View File

@@ -33,7 +33,7 @@ void TextBlock::render(const GfxRenderer& renderer, const int fontId, const int
if (w.size() >= 3 && static_cast<uint8_t>(w[0]) == 0xE2 && static_cast<uint8_t>(w[1]) == 0x80 &&
static_cast<uint8_t>(w[2]) == 0x83) {
const char* visiblePtr = w.c_str() + 3;
const int prefixWidth = renderer.getTextAdvanceX(fontId, "\xe2\x80\x83");
const int prefixWidth = renderer.getTextAdvanceX(fontId, "\xe2\x80\x83", currentStyle);
const int visibleWidth = renderer.getTextWidth(fontId, visiblePtr, currentStyle);
startX = wordX + prefixWidth;
underlineWidth = visibleWidth;