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feat: Arabic/Farsi/Urdu bidi reordering and contextual shaping — PR 1/3 (#2541)

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Co-authored-by: Uri Tauber <uritaube@gmail.com>
This commit is contained in:
Husam Younis
2026-07-13 16:02:21 +03:00
committed by GitHub
co-authored by Uri Tauber
parent 552b2683e6
commit 932a472835
18 changed files with 1087 additions and 62 deletions
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lib/EpdFont/EpdFont.cpp
+5 -4
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@@ -44,16 +44,17 @@ void EpdFont::getTextBounds(const char* string, const int startX, const int star
continue;
}
const int raiseBy = isCombining ? combiningMark::raiseAboveBase(glyph->top, glyph->height, lastBaseTop) : 0;
const combiningMark::Anchor anchor = combiningMark::anchorFor(cp);
const int raiseBy = isCombining ? combiningMark::raiseAboveBase(anchor, glyph->top, glyph->height, lastBaseTop) : 0;
if (!isCombining && prevCp != 0) {
const auto kernFP = getKerning(prevCp, cp); // 4.4 fixed-point kern
lastBaseX += fp4::toPixel(prevAdvanceFP + kernFP);
}
const int glyphBaseX =
isCombining ? combiningMark::centerOver(lastBaseX, lastBaseLeft, lastBaseWidth, glyph->left, glyph->width)
: lastBaseX;
const int glyphBaseX = isCombining ? combiningMark::anchorOver(anchor, lastBaseX, lastBaseLeft, lastBaseWidth,
glyph->left, glyph->width)
: lastBaseX;
const int glyphBaseY = startY - raiseBy;
*minX = std::min(*minX, glyphBaseX + glyph->left);