SkUTF.cpp File Reference

#include "src/base/SkUTF.h"
#include "include/private/base/SkTFitsIn.h"

Go to the source code of this file.

Functions
static constexpr int32_t	left_shift (int32_t value, int32_t shift)
template<typename T >
static constexpr bool	is_align2 (T x)
template<typename T >
static constexpr bool	is_align4 (T x)
static constexpr bool	utf16_is_high_surrogate (uint16_t c)
static constexpr bool	utf16_is_low_surrogate (uint16_t c)
static int	utf8_byte_type (uint8_t c)
static bool	utf8_type_is_valid_leading_byte (int type)
static bool	utf8_byte_is_continuation (uint8_t c)
template<typename T >
static SkUnichar	next_fail (const T **ptr, const T *end)

Function Documentation

is_align2()

template<typename T >

static constexpr bool is_align2 ( T  x )

staticconstexpr

Definition at line 12 of file SkUTF.cpp.

{ return 0 == (x & 1); }

is_align4()

template<typename T >

static constexpr bool is_align4 ( T  x )

staticconstexpr

Definition at line 14 of file SkUTF.cpp.

{ return 0 == (x & 3); }

left_shift()

static constexpr int32_t left_shift ( int32_t  value, int32_t  shift  )

inlinestaticconstexpr

Definition at line 8 of file SkUTF.cpp.

                                                                         {
    return (int32_t) ((uint32_t) value << shift);
}

next_fail()

template<typename T >

static SkUnichar next_fail ( const T **  ptr, const T *  end  )

static

Definition at line 113 of file SkUTF.cpp.

                                                        {
    *ptr = end;
    return -1;
}

utf16_is_high_surrogate()

static constexpr bool utf16_is_high_surrogate ( uint16_t  c )

inlinestaticconstexpr

Definition at line 16 of file SkUTF.cpp.

{ return (c & 0xFC00) == 0xD800; }

utf16_is_low_surrogate()

static constexpr bool utf16_is_low_surrogate ( uint16_t  c )

inlinestaticconstexpr

Definition at line 18 of file SkUTF.cpp.

{ return (c & 0xFC00) == 0xDC00; }

utf8_byte_is_continuation()

static bool utf8_byte_is_continuation ( uint8_t  c )

static

Definition at line 43 of file SkUTF.cpp.

{ return utf8_byte_type(c) == 0; }

utf8_byte_type()

static int utf8_byte_type ( uint8_t  c )

static

Returns

-1 iff invalid UTF8 byte, 0 iff UTF8 continuation byte, 1 iff ASCII byte, 2 iff leading byte of 2-byte sequence, 3 iff leading byte of 3-byte sequence, and 4 iff leading byte of 4-byte sequence. I.e.: if return value > 0, then gives length of sequence.

Definition at line 28 of file SkUTF.cpp.

                                     {
    if (c < 0x80) {
        return 1;
    } else if (c < 0xC0) {
        return 0;
    } else if (c >= 0xF5 || (c & 0xFE) == 0xC0) { // "octet values c0, c1, f5 to ff never appear"
        return -1;
    } else {
        int value = (((0xe5 << 24) >> ((unsigned)c >> 4 << 1)) & 3) + 1;
        // assert(value >= 2 && value <=4);
        return value;
    }
}

utf8_type_is_valid_leading_byte()

static bool utf8_type_is_valid_leading_byte ( int  type )

static

Definition at line 41 of file SkUTF.cpp.

{ return type > 0; }