libwebp 0.1.0

A binding to libwebp
Documentation 
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
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150

use std::fmt;
use std::marker::PhantomData;
use std::mem;
use std::ops::{Deref, DerefMut};
use std::os::raw::*;
use std::ptr::NonNull;

pub struct WebpBox<T: ?Sized> {
    ptr: NonNull<T>,
    _marker: PhantomData<T>,
}

impl<T: ?Sized> WebpBox<T> {
    pub unsafe fn from_raw(raw: *mut T) -> WebpBox<T> {
        Self {
            ptr: NonNull::new_unchecked(raw),
            _marker: PhantomData,
        }
    }

    pub fn into_raw(b: WebpBox<T>) -> *mut T {
        let ptr = b.ptr;
        mem::forget(b);
        ptr.as_ptr()
    }
}

impl<T: ?Sized> Deref for WebpBox<T> {
    type Target = T;
    fn deref(&self) -> &Self::Target {
        unsafe { self.ptr.as_ref() }
    }
}

impl<T: ?Sized> DerefMut for WebpBox<T> {
    fn deref_mut(&mut self) -> &mut Self::Target {
        unsafe { self.ptr.as_mut() }
    }
}

impl<T: ?Sized> Drop for WebpBox<T> {
    fn drop(&mut self) {
        unsafe {
            WebPFree(self.ptr.as_ptr() as *mut c_void);
        }
    }
}

#[cfg(feature = "0.5")]
use libwebp_sys::WebPFree;

#[cfg(not(feature = "0.5"))]
#[allow(non_snake_case)]
unsafe fn WebPFree(ptr: *mut c_void) {
    extern "C" {
        fn free(ptr: *mut c_void);
    }
    free(ptr);
}

impl<T: fmt::Debug + ?Sized> fmt::Debug for WebpBox<T> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        fmt::Debug::fmt(self as &T, f)
    }
}

pub struct WebpYuvBox {
    y: NonNull<[u8]>,
    u: NonNull<[u8]>,
    v: NonNull<[u8]>,
}

impl WebpYuvBox {
    pub unsafe fn from_raw_yuv(y: *mut [u8], u: *mut [u8], v: *mut [u8]) -> WebpYuvBox {
        Self {
            y: NonNull::new_unchecked(y),
            u: NonNull::new_unchecked(u),
            v: NonNull::new_unchecked(v),
        }
    }

    pub fn into_raw_yuv(self) -> (*mut [u8], *mut [u8], *mut [u8]) {
        let y = self.y.as_ptr();
        let u = self.u.as_ptr();
        let v = self.v.as_ptr();
        mem::forget(self);
        (y, u, v)
    }

    pub fn y(&self) -> &[u8] {
        unsafe { self.y.as_ref() }
    }
    pub fn y_mut(&mut self) -> &mut [u8] {
        unsafe { self.y.as_mut() }
    }

    pub fn u(&self) -> &[u8] {
        unsafe { self.u.as_ref() }
    }
    pub fn u_mut(&mut self) -> &mut [u8] {
        unsafe { self.u.as_mut() }
    }

    pub fn v(&self) -> &[u8] {
        unsafe { self.v.as_ref() }
    }
    pub fn v_mut(&mut self) -> &mut [u8] {
        unsafe { self.v.as_mut() }
    }

    pub fn yuv(&self) -> (&[u8], &[u8], &[u8]) {
        let y = unsafe { self.y.as_ref() };
        let u = unsafe { self.u.as_ref() };
        let v = unsafe { self.v.as_ref() };
        (y, u, v)
    }
    pub fn yuv_mut(&mut self) -> (&mut [u8], &mut [u8], &mut [u8]) {
        let y = unsafe { self.y.as_mut() };
        let u = unsafe { self.u.as_mut() };
        let v = unsafe { self.v.as_mut() };
        (y, u, v)
    }

    pub fn into_y(self) -> WebpBox<[u8]> {
        let y = self.y;
        mem::forget(self);
        WebpBox {
            ptr: y,
            _marker: PhantomData,
        }
    }
}

impl Drop for WebpYuvBox {
    fn drop(&mut self) {
        unsafe {
            WebPFree(self.y.as_ptr() as *mut c_void);
        }
    }
}

impl fmt::Debug for WebpYuvBox {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("WebpYuvBox")
            .field("y", &self.y())
            .field("u", &self.u())
            .field("v", &self.v())
            .finish()
    }
}