combostew/operations/wrapper/
filter_type.rs

1use std::error::Error;
2use std::fmt::{Debug, Formatter};
3
4// Wrapper for image::FilterType.
5// Does only exists, because image::FilterType does not implement PartialEq and Debug.
6pub enum FilterTypeWrap {
7    Inner(image::FilterType),
8}
9
10impl PartialEq<FilterTypeWrap> for FilterTypeWrap {
11    fn eq(&self, other: &FilterTypeWrap) -> bool {
12        match (self, other) {
13            (
14                FilterTypeWrap::Inner(image::FilterType::CatmullRom),
15                FilterTypeWrap::Inner(image::FilterType::CatmullRom),
16            ) => true,
17            (
18                FilterTypeWrap::Inner(image::FilterType::Gaussian),
19                FilterTypeWrap::Inner(image::FilterType::Gaussian),
20            ) => true,
21            (
22                FilterTypeWrap::Inner(image::FilterType::Lanczos3),
23                FilterTypeWrap::Inner(image::FilterType::Lanczos3),
24            ) => true,
25            (
26                FilterTypeWrap::Inner(image::FilterType::Nearest),
27                FilterTypeWrap::Inner(image::FilterType::Nearest),
28            ) => true,
29            (
30                FilterTypeWrap::Inner(image::FilterType::Triangle),
31                FilterTypeWrap::Inner(image::FilterType::Triangle),
32            ) => true,
33            _ => false,
34        }
35    }
36}
37
38impl Clone for FilterTypeWrap {
39    fn clone(&self) -> Self {
40        match self {
41            FilterTypeWrap::Inner(a) => FilterTypeWrap::Inner(*a),
42        }
43    }
44}
45
46impl Eq for FilterTypeWrap {}
47
48impl Debug for FilterTypeWrap {
49    fn fmt(&self, f: &mut Formatter) -> Result<(), std::fmt::Error> {
50        let msg = match self {
51            FilterTypeWrap::Inner(image::FilterType::CatmullRom) => {
52                "image::FilterType::CatmullRom (Wrapper)"
53            }
54            FilterTypeWrap::Inner(image::FilterType::Gaussian) => {
55                "image::FilterType::Gaussian (Wrapper)"
56            }
57            FilterTypeWrap::Inner(image::FilterType::Lanczos3) => {
58                "image::FilterType::Lanczos3 (Wrapper)"
59            }
60            FilterTypeWrap::Inner(image::FilterType::Nearest) => {
61                "image::FilterType::Nearest (Wrapper)"
62            }
63            FilterTypeWrap::Inner(image::FilterType::Triangle) => {
64                "image::FilterType::Triangle (Wrapper)"
65            }
66        };
67
68        f.write_str(msg)
69    }
70}
71
72impl From<FilterTypeWrap> for image::FilterType {
73    fn from(wrap: FilterTypeWrap) -> Self {
74        match wrap {
75            FilterTypeWrap::Inner(w) => w,
76        }
77    }
78}
79
80impl FilterTypeWrap {
81    pub fn try_from_str(val: &str) -> Result<FilterTypeWrap, Box<dyn Error>> {
82        match val.to_lowercase().as_str() {
83            "catmullrom" | "cubic" => Ok(FilterTypeWrap::Inner(image::FilterType::CatmullRom)),
84            "gaussian" => Ok(FilterTypeWrap::Inner(image::FilterType::Gaussian)),
85            "lanczos3" => Ok(FilterTypeWrap::Inner(image::FilterType::Lanczos3)),
86            "nearest" => Ok(FilterTypeWrap::Inner(image::FilterType::Nearest)),
87            "triangle" => Ok(FilterTypeWrap::Inner(image::FilterType::Triangle)),
88            fail => Err(format!("No such sampling filter: {}", fail).into()),
89        }
90    }
91}
combostew/operations/wrapper/filter_type.rs

combostew/operations/wrapper/
filter_type.rs
