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Implement bidi_should_transform()

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This now returns true if any of the characters in the text belong to
the Arabic or Hebrew alphabet, or are one of the Unicode directional
formatting characters. This is just so the bidi machinery doesn't have
to run 100% of the time for 100% of the languages. I will also make it
so the Arabic language pack, as well as custom levels, have an RTL
attribute that always enables bidi (and does things like
right-alignment in textboxes and other design-flipping)
This commit is contained in:
Dav999 2024-01-03 18:20:25 +01:00 committed by Misa Elizabeth Kai
parent 822755a75f
commit 45ec77973b
1 changed files with 33 additions and 2 deletions
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35
desktop_version/src/FontBidi.cpp
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@ -265,8 +265,39 @@ void bidi_destroy(void)
bool bidi_should_transform(const char* text)
{
// TODO
return true;
/* Just as an optimization, only run the whole bidi machinery if the
* language is actually an RTL one, _or_ if an RTL character is found. */
const char* text_ptr = text;
uint32_t ch;
while ((ch = UTF8_next(&text_ptr)))
{
// The standard Hebrew and Arabic blocks
if (ch >= 0x590 && ch <= 0x77F) return true;
// Extended Arabic B and A
if (ch >= 0x870 && ch <= 0x8FF) return true;
// LEFT-TO-RIGHT MARK and RIGHT-TO-LEFT MARK
if (ch == 0x200E || ch == 0x200F) return true;
// Some other directional formatting: LRE, RLE, PDF, RLO, LRO
if (ch >= 0x202A && ch <= 0x202E) return true;
// The more recent isolates: LRI, RLI, FSI, PDI
if (ch >= 0x2066 && ch <= 0x2069) return true;
// Hebrew presentation forms
if (ch >= 0xFB1D && ch <= 0xFB4F) return true;
// Arabic presentation forms A
if (ch >= 0xFB50 && ch <= 0xFDFF) return true;
// Arabic presentation forms B
if (ch >= 0xFE70 && ch <= 0xFEFE) return true;
}
return false;
}
const char* bidi_transform(const char* text)