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batcher and spritefont support utf8 strings

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This commit is contained in:
Noel Berry
2021-01-08 12:01:39 -08:00
parent 3bc36981cb
commit ecb9da86aa
4 changed files with 114 additions and 28 deletions
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44
src/containers/str.cpp
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@ -79,6 +79,50 @@ void Str::set_length(int len)
m_length = len;
}
uint32_t Str::utf8_at(int index) const
{
uint32_t charcode = 0;
int t = (unsigned char)(this->operator[](index++));
if (t < 128)
return t;
int high_bit_mask = (1 << 6) - 1;
int high_bit_shift = 0;
int total_bits = 0;
int other_bits = 6;
while ((t & 0xC0) == 0xC0)
{
t <<= 1;
t &= 0xff;
total_bits += 6;
high_bit_mask >>= 1;
high_bit_shift++;
charcode <<= other_bits;
charcode |= ((unsigned char)(this->operator[](index++))) & ((1 << other_bits) - 1);
}
charcode |= ((t >> high_bit_shift) & high_bit_mask) << total_bits;
return charcode;
}
int Str::utf8_length(int index) const
{
auto c = this->operator[](index);
if ((c & 0xFE) == 0xFC)
return 6;
if ((c & 0xFC) == 0xF8)
return 5;
if ((c & 0xF8) == 0xF0)
return 4;
else if ((c & 0xF0) == 0xE0)
return 3;
else if ((c & 0xE0) == 0xC0)
return 2;
return 1;
}
Str& Str::append(char c)
{
reserve(m_length + 1);