e9a9daa794
Switch to a state-machine UTF-8 decoder from the branchless one. This allows us to avoid copying the string on every `DrawString` call.
27 lines
582 B
C++
27 lines
582 B
C++
#include "utils/utf8.hpp"
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#include <cstddef>
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#include <hoehrmann_utf8.h>
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namespace devilution {
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char32_t DecodeFirstUtf8CodePoint(string_view input, uint8_t *len)
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{
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uint32_t codepoint = 0;
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uint32_t state = UTF8_ACCEPT;
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for (std::size_t i = 0; i < input.size(); ++i) {
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state = utf8_decode_step(state, static_cast<uint8_t>(input[i]), &codepoint);
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if (state == UTF8_ACCEPT) {
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*len = i + 1;
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return codepoint;
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}
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if (state == UTF8_REJECT) {
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*len = i + 1;
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return Utf8DecodeError;
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}
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}
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return codepoint;
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}
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} // namespace devilution
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