8a0fc81576
- Input state polling & consuming - is_key_down, is_key_just_pressed, is_key_just_release - consume_key_down, consume_key_just_pressed, consume_key_just_released - Input events - Key event - Scroll event - Text event - unicode.c - utf16_to_utf32
38 lines
No EOL
1.1 KiB
C
38 lines
No EOL
1.1 KiB
C
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#define UTF16_SURROGATE_HIGH_START 0xD800
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#define UTF16_SURROGATE_HIGH_END 0xDBFF
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#define UTF16_SURROGATE_LOW_START 0xDC00
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#define UTF16_SURROGATE_LOW_END 0xDFFF
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#define UTF16_SURROGATE_OFFSET 0x10000
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#define UTF16_SURROGATE_MASK 0x3FF
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// Returns how many utf16 units were converted
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int utf16_to_utf32(const u16 *utf16, u64 length, u32 *utf32) {
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if (length == 0 || utf16 == NULL || utf32 == NULL) {
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return -1;
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}
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u16 first = utf16[0];
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if (first >= UTF16_SURROGATE_HIGH_START && first <= UTF16_SURROGATE_HIGH_END) {
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if (length < 2) {
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return -1;
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}
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u16 second = utf16[1];
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if (second >= UTF16_SURROGATE_LOW_START && second <= UTF16_SURROGATE_LOW_END) {
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*utf32 = ((first - UTF16_SURROGATE_HIGH_START) << 10)
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+ (second - UTF16_SURROGATE_LOW_START)
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+ UTF16_SURROGATE_OFFSET;
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return 2;
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} else {
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return -1;
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}
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} else if (first >= UTF16_SURROGATE_LOW_START && first <= UTF16_SURROGATE_LOW_END) {
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return -1;
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} else {
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*utf32 = first;
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return 1;
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}
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} |