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Use common UTF8 infrastructure instead of rewriting one

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This commit is contained in:
Hoe Hao Cheng 2023-07-28 21:00:09 +08:00
parent f88d1a287e
commit 1c890be702
1 changed files with 4 additions and 29 deletions
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33
Common/Render/Text/draw_text_sdl.cpp
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@ -133,39 +133,14 @@ void TextDrawerSDL::PrepareFallbackFonts() {
#endif
}
// Count leading set bits. For use in UTF-8 decoding.
int LeadingOnes(uint8_t byte) {
for (int i = 7; i >= 0; i--) {
if (!((byte >> i) & 1)) return 7 - i;
}
return 8;
}
uint32_t TextDrawerSDL::CheckMissingGlyph(std::string& text) {
TTF_Font *font = fontMap_.find(fontHash_)->second;
UTF8 utf8Decoded(text.c_str());
uint32_t missingGlyph = 0;
const int length = text.length();
for (int i = 0; i < length; i++) {
uint32_t glyph; // UTF-32 char
// Decoding UTF-8 string into UTF-32 codepoints
if (LeadingOnes(text[i]) == 2 && (i + 1 < length)) {
glyph = text[i] & 0b00011111;
glyph = (glyph << 6) | (text[++i] & 0b00111111);
} else if (LeadingOnes(text[i]) == 3 && (i + 2 < length)) {
glyph = text[i] & 0b00001111;
glyph = (glyph << 6) | (text[++i] & 0b00111111);
glyph = (glyph << 6) | (text[++i] & 0b00111111);
} else if (LeadingOnes(text[i]) == 4 && (i + 3 < length)) {
glyph = text[i] & 0b00000111;
glyph = (glyph << 6) | (text[++i] & 0b00111111);
glyph = (glyph << 6) | (text[++i] & 0b00111111);
glyph = (glyph << 6) | (text[++i] & 0b00111111);
} else {
glyph = text[i];
}
for (int i = 0; i < text.length(); ) {
uint32_t glyph = utf8Decoded.next();
i = utf8Decoded.byteIndex();
if (!TTF_GlyphIsProvided32(font, glyph)) {
missingGlyph = glyph;