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Diffstat (limited to 'src/libjin/Graphics/Font/Decoder.cpp')
| -rw-r--r-- | src/libjin/Graphics/Font/Decoder.cpp | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/src/libjin/Graphics/Font/Decoder.cpp b/src/libjin/Graphics/Font/Decoder.cpp new file mode 100644 index 0000000..10927f0 --- /dev/null +++ b/src/libjin/Graphics/Font/Decoder.cpp @@ -0,0 +1,93 @@ +#include <stdlib.h> +#include <string.h> +#include "Decoder.h" + +namespace jin +{ +namespace graphics +{ + + /* utf8 byte string to unicode codepoint */ + static const char *utf8toCodepoint(const char *p, unsigned *res) { + return nullptr; + + } + + ///////////////////////////////////////////////////////////////////////////// + // decoders + ///////////////////////////////////////////////////////////////////////////// + + const void* Utf8::decode(const void* data, Codepoint* res) const + { + const char* p = (char*)data; + unsigned x, mask, shift; + switch (*p & 0xf0) { + case 0xf0: mask = 0x07; shift = 18; break; + case 0xe0: mask = 0x0f; shift = 12; break; + case 0xc0: + case 0xd0: mask = 0x1f; shift = 6; break; + default: + *res = *p; + return p + 1; + } + x = (*p & mask) << shift; + do { + if (*(++p) == '\0') { + *res = x; + return p; + } + shift -= 6; + x |= (*p & 0x3f) << shift; + } while (shift); + *res = x; + return p + 1; + } + + const void* Utf8::next(const void* data) const + { + const char* p = (char*)data; + unsigned x, mask, shift; + switch (*p & 0xf0) { + case 0xf0: mask = 0x07; shift = 18; break; + case 0xe0: mask = 0x0f; shift = 12; break; + case 0xc0: + case 0xd0: mask = 0x1f; shift = 6; break; + default: + return p + 1; + } + x = (*p & mask) << shift; + do { + if (*(++p) == '\0') { + return p; + } + shift -= 6; + x |= (*p & 0x3f) << shift; + } while (shift); + return p + 1; + } +/* + const void* Utf16::decode(const void* data, Codepoint* res) const + { + return nullptr; + } + + const void* Utf16::next(const void* data) const + { + return nullptr; + } +*/ + const void* Ascii::decode(const void* data, Codepoint* res) const + { + const char* p = (char*)data; + *res = *p; + return p + 1; + } + + const void* Ascii::next(const void* data) const + { + const char* p = (char*)data; + return p + 1; + } + +} // graphics +} // jin
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