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Hide unicode directional control characters

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They shouldn't be looked up in the font and displayed under any
circumstances.
This commit is contained in:
Dav999 2024-01-03 18:55:42 +01:00 committed by Misa Elizabeth Kai
parent 45ec77973b
commit 2003eed2a5
3 changed files with 31 additions and 8 deletions
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6
desktop_version/src/Font.cpp
View file

@ -1074,6 +1074,12 @@ static int print_char(
{
/* Draws the glyph for a codepoint at x,y.
* Returns the amount of pixels to advance the cursor. */
if (is_directional_character(codepoint) || is_joiner(codepoint))
{
// Some characters should be completely invisible
return 0;
}
const Font* f_glyph;
GlyphInfo* glyph = find_glyphinfo(f, codepoint, &f_glyph);
if (glyph == NULL)

29
desktop_version/src/FontBidi.cpp
View file

@ -263,6 +263,25 @@ void bidi_destroy(void)
}
bool is_directional_character(const uint32_t codepoint)
{
// LEFT-TO-RIGHT MARK and RIGHT-TO-LEFT MARK
if (codepoint == 0x200E || codepoint == 0x200F) return true;
// Some other directional formatting: LRE, RLE, PDF, RLO, LRO
if (codepoint >= 0x202A && codepoint <= 0x202E) return true;
// The more recent isolates: LRI, RLI, FSI, PDI
if (codepoint >= 0x2066 && codepoint <= 0x2069) return true;
return false;
}
bool is_joiner(const uint32_t codepoint)
{
return codepoint == 0x200C || codepoint == 0x200D;
}
bool bidi_should_transform(const char* text)
{
/* Just as an optimization, only run the whole bidi machinery if the
@ -278,14 +297,8 @@ bool bidi_should_transform(const char* text)
// 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;
// Any directional control character
if (is_directional_character(ch)) return true;
// Hebrew presentation forms
if (ch >= 0xFB1D && ch <= 0xFB4F) return true;

4
desktop_version/src/FontBidi.h
View file

@ -1,11 +1,15 @@
#ifndef FONTBIDI_H
#define FONTBIDI_H
#include <stdint.h>
namespace font
{
void bidi_init(void);
void bidi_destroy(void);
bool is_directional_character(uint32_t codepoint);
bool is_joiner(uint32_t codepoint);
bool bidi_should_transform(const char* text);
const char* bidi_transform(const char* text);