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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/SdCardFont.h
+10 -4
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@@ -47,9 +47,12 @@ class SdCardFont {
// Build a compact advance-only table for layout measurement.
// Extracts ALL unique codepoints from words (no MAX_PAGE_GLYPHS cap),
// batch-reads advanceX from SD, stores in a sorted per-style table.
// extraText: optional additional codepoints to warm in the same SD pass
// (e.g. shaped Arabic presentation forms the measurement path will look up).
// Returns number of codepoints not found in font coverage.
int buildAdvanceTable(const char* utf8Text, uint8_t styleMask = 0x0F);
int buildAdvanceTable(const std::vector<std::string>& words, bool includeHyphen, uint8_t styleMask = 0x0F);
int buildAdvanceTable(const char* utf8Text, uint8_t styleMask = 0x0F, const char* extraText = nullptr);
int buildAdvanceTable(const std::vector<std::string>& words, bool includeHyphen, uint8_t styleMask = 0x0F,
const char* extraText = nullptr);
// Look up advanceX for a codepoint from the advance table.
// Returns the 12.4 fixed-point advance, or 0 if not found.
@@ -140,11 +143,13 @@ class SdCardFont {
// Full intervals loaded from file (kept in RAM for codepoint lookup)
EpdUnicodeInterval* fullIntervals = nullptr;
EPD_PACKED_BEGIN
struct BmpInterval16 {
uint16_t first;
uint16_t last;
uint16_t offset;
} __attribute__((packed));
} EPD_PACKED_ATTR;
EPD_PACKED_END
static_assert(sizeof(BmpInterval16) == 6, "BmpInterval16 must remain compact");
BmpInterval16* bmpIntervals = nullptr;
bool intervalsAreBmp16 = false;
@@ -249,7 +254,8 @@ class SdCardFont {
int32_t findGlobalGlyphIndex(const PerStyle& s, uint32_t codepoint) const;
int fetchAdvancesForCodepoints(uint32_t* codepoints, uint32_t cpCount, uint8_t styleMask);
template <typename Iter>
int buildAdvanceTableRange(Iter begin, Iter end, bool includeSpace, bool includeHyphen, uint8_t styleMask);
int buildAdvanceTableRange(Iter begin, Iter end, bool includeSpace, bool includeHyphen, uint8_t styleMask,
const char* extraText = nullptr);
int prewarmStyle(uint8_t styleIdx, const uint32_t* codepoints, uint32_t cpCount, bool metadataOnly);
// Global helpers