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feat: add RTL support in epub and txt readers (#1700)

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Co-authored-by: Zach Nelson <zach@zdnelson.com>
This commit is contained in:
Uri Tauber
2026-05-29 03:25:17 -04:00
committed by GitHub
co-authored by Zach Nelson
parent cc2079a578
commit f5bc554ae7
27 changed files with 1621 additions and 119 deletions
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lib/GfxRenderer/GfxRenderer.h
+14 -3
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@@ -3,6 +3,14 @@
#include <EpdFontFamily.h>
#include <HalDisplay.h>
namespace BidiUtils {
// Paragraph base direction for the Unicode BiDi algorithm (UAX#9).
// AUTO: scan text for first strong directional character (P2/P3 rules)
// LTR: force left-to-right paragraph embedding level
// RTL: force right-to-left paragraph embedding level
enum class BidiBaseDir : signed char { AUTO = -1, LTR = 0, RTL = 1 };
} // namespace BidiUtils
class FontCacheManager;
class SdCardFont;
@@ -175,11 +183,14 @@ class GfxRenderer {
void fillPolygon(const int* xPoints, const int* yPoints, int numPoints, bool state = true) const;
// Text
int getTextWidth(int fontId, const char* text, EpdFontFamily::Style style = EpdFontFamily::REGULAR) const;
int getTextWidth(int fontId, const char* text, EpdFontFamily::Style style = EpdFontFamily::REGULAR,
BidiUtils::BidiBaseDir baseDir = BidiUtils::BidiBaseDir::AUTO) const;
void drawCenteredText(int fontId, int y, const char* text, bool black = true,
EpdFontFamily::Style style = EpdFontFamily::REGULAR) const;
EpdFontFamily::Style style = EpdFontFamily::REGULAR,
BidiUtils::BidiBaseDir baseDir = BidiUtils::BidiBaseDir::AUTO) const;
void drawText(int fontId, int x, int y, const char* text, bool black = true,
EpdFontFamily::Style style = EpdFontFamily::REGULAR) const;
EpdFontFamily::Style style = EpdFontFamily::REGULAR,
BidiUtils::BidiBaseDir baseDir = BidiUtils::BidiBaseDir::AUTO) const;
int getSpaceWidth(int fontId, EpdFontFamily::Style style = EpdFontFamily::REGULAR) const;
/// Returns the total inter-word advance: fp4::toPixel(spaceAdvance + kern(leftCp,' ') + kern(' ',rightCp)).
/// Using a single snap avoids the +/-1 px rounding error that arises when space advance and kern are