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Speeding up some wchar<>UTF8 functions and some specialization for Ascii. (testing 500 KB text for #200)

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This commit is contained in:
ocornut 2015-06-18 11:30:10 -06:00
parent c06373de93
commit 9180126db6
1 changed files with 53 additions and 45 deletions
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98
imgui.cpp
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@ -564,11 +564,12 @@ static inline int ImUpperPowerOfTwo(int v) { v--; v |= v >> 1; v |= v >> 2; v
static inline bool ImCharIsSpace(int c) { return c == ' ' || c == '\t' || c == 0x3000; }
// Helpers: UTF-8 <> wchar
static int ImTextCharToUtf8(char* buf, size_t buf_size, unsigned int in_char); // return output UTF-8 bytes count
static inline int ImTextCharToUtf8(char* buf, size_t buf_size, unsigned int in_char); // return output UTF-8 bytes count
static ptrdiff_t ImTextStrToUtf8(char* buf, size_t buf_size, const ImWchar* in_text, const ImWchar* in_text_end); // return output UTF-8 bytes count
static int ImTextCharFromUtf8(unsigned int* out_char, const char* in_text, const char* in_text_end); // return input UTF-8 bytes count
static ptrdiff_t ImTextStrFromUtf8(ImWchar* buf, size_t buf_size, const char* in_text, const char* in_text_end, const char** in_remaining = NULL); // return input UTF-8 bytes count
static int ImTextCountCharsFromUtf8(const char* in_text, const char* in_text_end); // return number of UTF-8 code-points (NOT bytes count)
static inline int ImTextCountUtf8BytesFromChar(unsigned int in_char); // return output UTF-8 bytes count
static int ImTextCountUtf8BytesFromStr(const ImWchar* in_text, const ImWchar* in_text_end); // return number of bytes to express string as UTF-8 code-points
//-----------------------------------------------------------------------------
@ -9745,48 +9746,50 @@ static int ImTextCountCharsFromUtf8(const char* in_text, const char* in_text_end
}
// Based on stb_to_utf8() from github.com/nothings/stb/
static int ImTextCharToUtf8(char* buf, size_t buf_size, unsigned int c)
static inline int ImTextCharToUtf8(char* buf, size_t buf_size, unsigned int c)
{
if (c)
if (c < 0x80)
{
size_t i = 0;
size_t n = buf_size;
if (c < 0x80)
{
if (i+1 > n) return 0;
buf[i++] = (char)c;
return 1;
}
else if (c < 0x800)
{
if (i+2 > n) return 0;
buf[i++] = (char)(0xc0 + (c >> 6));
buf[i++] = (char)(0x80 + (c & 0x3f));
return 2;
}
else if (c >= 0xdc00 && c < 0xe000)
{
return 0;
}
else if (c >= 0xd800 && c < 0xdc00)
{
if (i+4 > n) return 0;
buf[i++] = (char)(0xf0 + (c >> 18));
buf[i++] = (char)(0x80 + ((c >> 12) & 0x3f));
buf[i++] = (char)(0x80 + ((c >> 6) & 0x3f));
buf[i++] = (char)(0x80 + ((c ) & 0x3f));
return 4;
}
//else if (c < 0x10000)
{
if (i+3 > n) return 0;
buf[i++] = (char)(0xe0 + (c >> 12));
buf[i++] = (char)(0x80 + ((c>> 6) & 0x3f));
buf[i++] = (char)(0x80 + ((c ) & 0x3f));
return 3;
}
buf[0] = (char)c;
return 1;
}
return 0;
if (c < 0x800)
{
if (buf_size < 2) return 0;
buf[0] = (char)(0xc0 + (c >> 6));
buf[1] = (char)(0x80 + (c & 0x3f));
return 2;
}
if (c >= 0xdc00 && c < 0xe000)
{
return 0;
}
if (c >= 0xd800 && c < 0xdc00)
{
if (buf_size < 4) return 0;
buf[0] = (char)(0xf0 + (c >> 18));
buf[1] = (char)(0x80 + ((c >> 12) & 0x3f));
buf[2] = (char)(0x80 + ((c >> 6) & 0x3f));
buf[3] = (char)(0x80 + ((c ) & 0x3f));
return 4;
}
//else if (c < 0x10000)
{
if (buf_size < 3) return 0;
buf[0] = (char)(0xe0 + (c >> 12));
buf[1] = (char)(0x80 + ((c>> 6) & 0x3f));
buf[2] = (char)(0x80 + ((c ) & 0x3f));
return 3;
}
}
static inline int ImTextCountUtf8BytesFromChar(unsigned int c)
{
if (c < 0x80) return 1;
if (c < 0x800) return 2;
if (c >= 0xdc00 && c < 0xe000) return 0;
if (c >= 0xd800 && c < 0xdc00) return 4;
return 3;
}
static ptrdiff_t ImTextStrToUtf8(char* buf, size_t buf_size, const ImWchar* in_text, const ImWchar* in_text_end)
@ -9795,8 +9798,11 @@ static ptrdiff_t ImTextStrToUtf8(char* buf, size_t buf_size, const ImWchar* in_t
const char* buf_end = buf + buf_size;
while (buf_out < buf_end-1 && (!in_text_end || in_text < in_text_end) && *in_text)
{
buf_out += ImTextCharToUtf8(buf_out, (uintptr_t)(buf_end-buf_out-1), (unsigned int)*in_text);
in_text++;
unsigned int c = (unsigned int)(*in_text++);
if (c < 0x80)
*buf_out++ = (char)c;
else
buf_out += ImTextCharToUtf8(buf_out, (uintptr_t)(buf_end-buf_out-1), c);
}
*buf_out = 0;
return buf_out - buf;
@ -9807,9 +9813,11 @@ static int ImTextCountUtf8BytesFromStr(const ImWchar* in_text, const ImWchar* in
int bytes_count = 0;
while ((!in_text_end || in_text < in_text_end) && *in_text)
{
char dummy[5]; // FIXME-OPT
bytes_count += ImTextCharToUtf8(dummy, 5, (unsigned int)*in_text);
in_text++;
unsigned int c = (unsigned int)(*in_text++);
if (c < 0x80)
bytes_count++;
else
bytes_count += ImTextCountUtf8BytesFromChar(c);
}
return bytes_count;
}