Grcov report - lut.rs

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//! WOFF2 lookup tables.

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use crate::tag::*;

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// When table tags are encoded into a WOFF2 TableDirectoryEntry this table is used to provide a

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// 5-bit encoding for common tables. The tables are in the order that they are encoded such that

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// the value read from the file can be looked up in this array to get the corresponding tag. If the

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// value is 0b11111 (63), which is not present in this table, then this is an indication that a

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// 4-byte tag follows the tag in the data stream.

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// https://www.w3.org/TR/WOFF2/#table_dir_format

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pub static KNOWN_TABLE_TAGS: [u32; 63] = [

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    CMAP, HEAD, HHEA, HMTX, MAXP, NAME, OS_2, POST, CVT, FPGM, GLYF, LOCA, PREP, CFF, VORG, EBDT,

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    EBLC, GASP, HDMX, KERN, LTSH, PCLT, VDMX, VHEA, VMTX, BASE, GDEF, GPOS, GSUB, EBSC, JSTF, MATH,

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    CBDT, CBLC, COLR, CPAL, SVG, SBIX, ACNT, AVAR, BDAT, BLOC, BSLN, CVAR, FDSC, FEAT, FMTX, FVAR,

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    GVAR, HSTY, JUST, LCAR, MORT, MORX, OPBD, PROP, TRAK, ZAPF, SILF, GLAT, GLOC, FEAT2, SILL,

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];

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pub struct XYTriplet {

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    pub x_is_negative: bool,

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    pub y_is_negative: bool,

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    pub byte_count: u8,

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    pub x_bits: u8,

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    pub y_bits: u8,

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    pub delta_x: u16,

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    pub delta_y: u16,

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impl XYTriplet {

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    pub fn dx(&self, data: u32) -> i16 {

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        let mask = (1u32 << self.x_bits) - 1;

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        let shift = (self.byte_count * 8) - self.x_bits;

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        let dx = ((data >> shift) & mask) + u32::from(self.delta_x);

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        if self.x_is_negative {

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            -(dx as i16)

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        } else {

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            dx as i16

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    pub fn dy(&self, data: u32) -> i16 {

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        let mask = (1u32 << self.y_bits) - 1;

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        let shift = (self.byte_count * 8) - self.x_bits - self.y_bits;

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        let dy = ((data >> shift) & mask) + u32::from(self.delta_y);

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        if self.y_is_negative {

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            -(dy as i16)

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        } else {

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            dy as i16

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// Lookup table for decoding transformed glyf table point coordinates

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// https://www.w3.org/TR/WOFF2/#glyf_table_format

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#[rustfmt::skip]

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pub static COORD_LUT: [XYTriplet; 128] = [

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    XYTriplet { byte_count: 1, x_bits: 0,  y_bits: 8,  delta_x: 0,    delta_y: 0,    x_is_negative: false, y_is_negative: true  },

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    XYTriplet { byte_count: 1, x_bits: 0,  y_bits: 8,  delta_x: 0,    delta_y: 0,    x_is_negative: false, y_is_negative: false },

60

    XYTriplet { byte_count: 1, x_bits: 0,  y_bits: 8,  delta_x: 0,    delta_y: 256,  x_is_negative: false, y_is_negative: true  },

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    XYTriplet { byte_count: 1, x_bits: 0,  y_bits: 8,  delta_x: 0,    delta_y: 256,  x_is_negative: false, y_is_negative: false },

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    XYTriplet { byte_count: 1, x_bits: 0,  y_bits: 8,  delta_x: 0,    delta_y: 512,  x_is_negative: false, y_is_negative: true  },

63

    XYTriplet { byte_count: 1, x_bits: 0,  y_bits: 8,  delta_x: 0,    delta_y: 512,  x_is_negative: false, y_is_negative: false },

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    XYTriplet { byte_count: 1, x_bits: 0,  y_bits: 8,  delta_x: 0,    delta_y: 768,  x_is_negative: false, y_is_negative: true  },

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    XYTriplet { byte_count: 1, x_bits: 0,  y_bits: 8,  delta_x: 0,    delta_y: 768,  x_is_negative: false, y_is_negative: false },

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    XYTriplet { byte_count: 1, x_bits: 0,  y_bits: 8,  delta_x: 0,    delta_y: 1024, x_is_negative: false, y_is_negative: true  },

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    XYTriplet { byte_count: 1, x_bits: 0,  y_bits: 8,  delta_x: 0,    delta_y: 1024, x_is_negative: false, y_is_negative: false },

68

    XYTriplet { byte_count: 1, x_bits: 8,  y_bits: 0,  delta_x: 0,    delta_y: 0,    x_is_negative: true,  y_is_negative: false },

69

    XYTriplet { byte_count: 1, x_bits: 8,  y_bits: 0,  delta_x: 0,    delta_y: 0,    x_is_negative: false, y_is_negative: false },

70

    XYTriplet { byte_count: 1, x_bits: 8,  y_bits: 0,  delta_x: 256,  delta_y: 0,    x_is_negative: true,  y_is_negative: false },

71

    XYTriplet { byte_count: 1, x_bits: 8,  y_bits: 0,  delta_x: 256,  delta_y: 0,    x_is_negative: false, y_is_negative: false },

72

    XYTriplet { byte_count: 1, x_bits: 8,  y_bits: 0,  delta_x: 512,  delta_y: 0,    x_is_negative: true,  y_is_negative: false },

73

    XYTriplet { byte_count: 1, x_bits: 8,  y_bits: 0,  delta_x: 512,  delta_y: 0,    x_is_negative: false, y_is_negative: false },

74

    XYTriplet { byte_count: 1, x_bits: 8,  y_bits: 0,  delta_x: 768,  delta_y: 0,    x_is_negative: true,  y_is_negative: false },

75

    XYTriplet { byte_count: 1, x_bits: 8,  y_bits: 0,  delta_x: 768,  delta_y: 0,    x_is_negative: false, y_is_negative: false },

76

    XYTriplet { byte_count: 1, x_bits: 8,  y_bits: 0,  delta_x: 1024, delta_y: 0,    x_is_negative: true,  y_is_negative: false },

77

    XYTriplet { byte_count: 1, x_bits: 8,  y_bits: 0,  delta_x: 1024, delta_y: 0,    x_is_negative: false, y_is_negative: false },

78

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 1,    delta_y: 1,    x_is_negative: true,  y_is_negative: true  },

79

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 1,    delta_y: 1,    x_is_negative: false, y_is_negative: true  },

80

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 1,    delta_y: 1,    x_is_negative: true,  y_is_negative: false },

81

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 1,    delta_y: 1,    x_is_negative: false, y_is_negative: false },

82

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 1,    delta_y: 17,   x_is_negative: true,  y_is_negative: true  },

83

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 1,    delta_y: 17,   x_is_negative: false, y_is_negative: true  },

84

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 1,    delta_y: 17,   x_is_negative: true,  y_is_negative: false },

85

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 1,    delta_y: 17,   x_is_negative: false, y_is_negative: false },

86

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 1,    delta_y: 33,   x_is_negative: true,  y_is_negative: true  },

87

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 1,    delta_y: 33,   x_is_negative: false, y_is_negative: true  },

88

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 1,    delta_y: 33,   x_is_negative: true,  y_is_negative: false },

89

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 1,    delta_y: 33,   x_is_negative: false, y_is_negative: false },

90

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 1,    delta_y: 49,   x_is_negative: true,  y_is_negative: true  },

91

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 1,    delta_y: 49,   x_is_negative: false, y_is_negative: true  },

92

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 1,    delta_y: 49,   x_is_negative: true,  y_is_negative: false },

93

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 1,    delta_y: 49,   x_is_negative: false, y_is_negative: false },

94

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 17,   delta_y: 1,    x_is_negative: true,  y_is_negative: true  },

95

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 17,   delta_y: 1,    x_is_negative: false, y_is_negative: true  },

96

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 17,   delta_y: 1,    x_is_negative: true,  y_is_negative: false },

97

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 17,   delta_y: 1,    x_is_negative: false, y_is_negative: false },

98

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 17,   delta_y: 17,   x_is_negative: true,  y_is_negative: true  },

99

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 17,   delta_y: 17,   x_is_negative: false, y_is_negative: true  },

100

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 17,   delta_y: 17,   x_is_negative: true,  y_is_negative: false },

101

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 17,   delta_y: 17,   x_is_negative: false, y_is_negative: false },

102

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 17,   delta_y: 33,   x_is_negative: true,  y_is_negative: true  },

103

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 17,   delta_y: 33,   x_is_negative: false, y_is_negative: true  },

104

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 17,   delta_y: 33,   x_is_negative: true,  y_is_negative: false },

105

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 17,   delta_y: 33,   x_is_negative: false, y_is_negative: false },

106

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 17,   delta_y: 49,   x_is_negative: true,  y_is_negative: true  },

107

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 17,   delta_y: 49,   x_is_negative: false, y_is_negative: true  },

108

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 17,   delta_y: 49,   x_is_negative: true,  y_is_negative: false },

109

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 17,   delta_y: 49,   x_is_negative: false, y_is_negative: false },

110

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 33,   delta_y: 1,    x_is_negative: true,  y_is_negative: true  },

111

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 33,   delta_y: 1,    x_is_negative: false, y_is_negative: true  },

112

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 33,   delta_y: 1,    x_is_negative: true,  y_is_negative: false },

113

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 33,   delta_y: 1,    x_is_negative: false, y_is_negative: false },

114

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 33,   delta_y: 17,   x_is_negative: true,  y_is_negative: true  },

115

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 33,   delta_y: 17,   x_is_negative: false, y_is_negative: true  },

116

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 33,   delta_y: 17,   x_is_negative: true,  y_is_negative: false },

117

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 33,   delta_y: 17,   x_is_negative: false, y_is_negative: false },

118

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 33,   delta_y: 33,   x_is_negative: true,  y_is_negative: true  },

119

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 33,   delta_y: 33,   x_is_negative: false, y_is_negative: true  },

120

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 33,   delta_y: 33,   x_is_negative: true,  y_is_negative: false },

121

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 33,   delta_y: 33,   x_is_negative: false, y_is_negative: false },

122

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 33,   delta_y: 49,   x_is_negative: true,  y_is_negative: true  },

123

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 33,   delta_y: 49,   x_is_negative: false, y_is_negative: true  },

124

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 33,   delta_y: 49,   x_is_negative: true,  y_is_negative: false },

125

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 33,   delta_y: 49,   x_is_negative: false, y_is_negative: false },

126

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 49,   delta_y: 1,    x_is_negative: true,  y_is_negative: true  },

127

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 49,   delta_y: 1,    x_is_negative: false, y_is_negative: true  },

128

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 49,   delta_y: 1,    x_is_negative: true,  y_is_negative: false },

129

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 49,   delta_y: 1,    x_is_negative: false, y_is_negative: false },

130

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 49,   delta_y: 17,   x_is_negative: true,  y_is_negative: true  },

131

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 49,   delta_y: 17,   x_is_negative: false, y_is_negative: true  },

132

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 49,   delta_y: 17,   x_is_negative: true,  y_is_negative: false },

133

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 49,   delta_y: 17,   x_is_negative: false, y_is_negative: false },

134

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 49,   delta_y: 33,   x_is_negative: true,  y_is_negative: true  },

135

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 49,   delta_y: 33,   x_is_negative: false, y_is_negative: true  },

136

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 49,   delta_y: 33,   x_is_negative: true,  y_is_negative: false },

137

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 49,   delta_y: 33,   x_is_negative: false, y_is_negative: false },

138

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 49,   delta_y: 49,   x_is_negative: true,  y_is_negative: true  },

139

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 49,   delta_y: 49,   x_is_negative: false, y_is_negative: true  },

140

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 49,   delta_y: 49,   x_is_negative: true,  y_is_negative: false },

141

    XYTriplet { byte_count: 1, x_bits: 4,  y_bits: 4,  delta_x: 49,   delta_y: 49,   x_is_negative: false, y_is_negative: false },

142

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 1,    delta_y: 1,    x_is_negative: true,  y_is_negative: true  },

143

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 1,    delta_y: 1,    x_is_negative: false, y_is_negative: true  },

144

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 1,    delta_y: 1,    x_is_negative: true,  y_is_negative: false },

145

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 1,    delta_y: 1,    x_is_negative: false, y_is_negative: false },

146

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 1,    delta_y: 257,  x_is_negative: true,  y_is_negative: true  },

147

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 1,    delta_y: 257,  x_is_negative: false, y_is_negative: true  },

148

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 1,    delta_y: 257,  x_is_negative: true,  y_is_negative: false },

149

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 1,    delta_y: 257,  x_is_negative: false, y_is_negative: false },

150

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 1,    delta_y: 513,  x_is_negative: true,  y_is_negative: true  },

151

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 1,    delta_y: 513,  x_is_negative: false, y_is_negative: true  },

152

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 1,    delta_y: 513,  x_is_negative: true,  y_is_negative: false },

153

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 1,    delta_y: 513,  x_is_negative: false, y_is_negative: false },

154

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 257,  delta_y: 1,    x_is_negative: true,  y_is_negative: true  },

155

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 257,  delta_y: 1,    x_is_negative: false, y_is_negative: true  },

156

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 257,  delta_y: 1,    x_is_negative: true,  y_is_negative: false },

157

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 257,  delta_y: 1,    x_is_negative: false, y_is_negative: false },

158

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 257,  delta_y: 257,  x_is_negative: true,  y_is_negative: true  },

159

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 257,  delta_y: 257,  x_is_negative: false, y_is_negative: true  },

160

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 257,  delta_y: 257,  x_is_negative: true,  y_is_negative: false },

161

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 257,  delta_y: 257,  x_is_negative: false, y_is_negative: false },

162

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 257,  delta_y: 513,  x_is_negative: true,  y_is_negative: true  },

163

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 257,  delta_y: 513,  x_is_negative: false, y_is_negative: true  },

164

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 257,  delta_y: 513,  x_is_negative: true,  y_is_negative: false },

165

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 257,  delta_y: 513,  x_is_negative: false, y_is_negative: false },

166

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 513,  delta_y: 1,    x_is_negative: true,  y_is_negative: true  },

167

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 513,  delta_y: 1,    x_is_negative: false, y_is_negative: true  },

168

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 513,  delta_y: 1,    x_is_negative: true,  y_is_negative: false },

169

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 513,  delta_y: 1,    x_is_negative: false, y_is_negative: false },

170

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 513,  delta_y: 257,  x_is_negative: true,  y_is_negative: true  },

171

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 513,  delta_y: 257,  x_is_negative: false, y_is_negative: true  },

172

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 513,  delta_y: 257,  x_is_negative: true,  y_is_negative: false },

173

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 513,  delta_y: 257,  x_is_negative: false, y_is_negative: false },

174

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 513,  delta_y: 513,  x_is_negative: true,  y_is_negative: true  },

175

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 513,  delta_y: 513,  x_is_negative: false, y_is_negative: true  },

176

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 513,  delta_y: 513,  x_is_negative: true,  y_is_negative: false },

177

    XYTriplet { byte_count: 2, x_bits: 8,  y_bits: 8,  delta_x: 513,  delta_y: 513,  x_is_negative: false, y_is_negative: false },

178

    XYTriplet { byte_count: 3, x_bits: 12, y_bits: 12, delta_x: 0,    delta_y: 0,    x_is_negative: true,  y_is_negative: true  },

179

    XYTriplet { byte_count: 3, x_bits: 12, y_bits: 12, delta_x: 0,    delta_y: 0,    x_is_negative: false, y_is_negative: true  },

180

    XYTriplet { byte_count: 3, x_bits: 12, y_bits: 12, delta_x: 0,    delta_y: 0,    x_is_negative: true,  y_is_negative: false },

181

    XYTriplet { byte_count: 3, x_bits: 12, y_bits: 12, delta_x: 0,    delta_y: 0,    x_is_negative: false, y_is_negative: false },

182

    XYTriplet { byte_count: 4, x_bits: 16, y_bits: 16, delta_x: 0,    delta_y: 0,    x_is_negative: true,  y_is_negative: true  },

183

    XYTriplet { byte_count: 4, x_bits: 16, y_bits: 16, delta_x: 0,    delta_y: 0,    x_is_negative: false, y_is_negative: true  },

184

    XYTriplet { byte_count: 4, x_bits: 16, y_bits: 16, delta_x: 0,    delta_y: 0,    x_is_negative: true,  y_is_negative: false },

185

    XYTriplet { byte_count: 4, x_bits: 16, y_bits: 16, delta_x: 0,    delta_y: 0,    x_is_negative: false, y_is_negative: false },

186

];