1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
use std::fmt;
#[derive(Debug,PartialEq,Clone,Copy)]
pub enum ColorType {
Grayscale,
RGB,
Indexed,
GrayscaleAlpha,
RGBA,
}
impl fmt::Display for ColorType {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f,
"{}",
match *self {
ColorType::Grayscale => "Grayscale",
ColorType::RGB => "RGB",
ColorType::Indexed => "Indexed",
ColorType::GrayscaleAlpha => "Grayscale + Alpha",
ColorType::RGBA => "RGB + Alpha",
})
}
}
impl ColorType {
#[inline]
pub fn png_header_code(&self) -> u8 {
match *self {
ColorType::Grayscale => 0,
ColorType::RGB => 2,
ColorType::Indexed => 3,
ColorType::GrayscaleAlpha => 4,
ColorType::RGBA => 6,
}
}
}
#[derive(Debug,PartialEq,Clone,Copy)]
pub enum BitDepth {
One,
Two,
Four,
Eight,
Sixteen,
}
impl fmt::Display for BitDepth {
#[inline]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f,
"{}",
match *self {
BitDepth::One => "1",
BitDepth::Two => "2",
BitDepth::Four => "4",
BitDepth::Eight => "8",
BitDepth::Sixteen => "16",
})
}
}
impl BitDepth {
#[inline]
pub fn as_u8(&self) -> u8 {
match *self {
BitDepth::One => 1,
BitDepth::Two => 2,
BitDepth::Four => 4,
BitDepth::Eight => 8,
BitDepth::Sixteen => 16,
}
}
#[inline]
pub fn from_u8(depth: u8) -> BitDepth {
match depth {
1 => BitDepth::One,
2 => BitDepth::Two,
4 => BitDepth::Four,
8 => BitDepth::Eight,
16 => BitDepth::Sixteen,
_ => panic!("Unsupported bit depth"),
}
}
}