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
151
152
153
154
155
156
157
158
159

use std::ptr;

use crate::base::CGFloat;
use crate::color_space::CGColorSpace;
use crate::data_provider::{CGDataProvider, CGDataProviderRef};
use crate::geometry::CGRect;
use core_foundation::base::{CFRetain, CFTypeID};
use core_foundation::data::CFData;
use foreign_types::{foreign_type, ForeignType, ForeignTypeRef};
use libc::size_t;

#[repr(C)]
pub enum CGImageAlphaInfo {
    CGImageAlphaNone,               /* For example, RGB. */
    CGImageAlphaPremultipliedLast,  /* For example, premultiplied RGBA */
    CGImageAlphaPremultipliedFirst, /* For example, premultiplied ARGB */
    CGImageAlphaLast,               /* For example, non-premultiplied RGBA */
    CGImageAlphaFirst,              /* For example, non-premultiplied ARGB */
    CGImageAlphaNoneSkipLast,       /* For example, RBGX. */
    CGImageAlphaNoneSkipFirst,      /* For example, XRBG. */
    CGImageAlphaOnly,               /* No color data, alpha data only */
}

#[repr(C)]
pub enum CGImageByteOrderInfo {
    CGImageByteOrderMask = 0x7000,
    CGImageByteOrder16Little = 1 << 12,
    CGImageByteOrder32Little = 2 << 12,
    CGImageByteOrder16Big = 3 << 12,
    CGImageByteOrder32Big = 4 << 12,
}

foreign_type! {
    #[doc(hidden)]
    pub unsafe type CGImage {
        type CType = crate::sys::CGImage;
        fn drop = CGImageRelease;
        fn clone = |p| CFRetain(p as *const _) as *mut _;
    }
}

impl CGImage {
    pub fn new(
        width: size_t,
        height: size_t,
        bits_per_component: size_t,
        bits_per_pixel: size_t,
        bytes_per_row: size_t,
        colorspace: &CGColorSpace,
        bitmap_info: u32,
        provider: &CGDataProvider,
        should_interpolate: bool,
        rendering_intent: u32,
    ) -> Self {
        unsafe {
            let result = CGImageCreate(
                width,
                height,
                bits_per_component,
                bits_per_pixel,
                bytes_per_row,
                colorspace.as_ptr(),
                bitmap_info,
                provider.as_ptr(),
                ptr::null_mut(),
                should_interpolate,
                rendering_intent,
            );
            assert!(!result.is_null());
            Self::from_ptr(result)
        }
    }

    pub fn type_id() -> CFTypeID {
        unsafe { CGImageGetTypeID() }
    }
}

impl CGImageRef {
    pub fn width(&self) -> size_t {
        unsafe { CGImageGetWidth(self.as_ptr()) }
    }

    pub fn height(&self) -> size_t {
        unsafe { CGImageGetHeight(self.as_ptr()) }
    }

    pub fn bits_per_component(&self) -> size_t {
        unsafe { CGImageGetBitsPerComponent(self.as_ptr()) }
    }

    pub fn bits_per_pixel(&self) -> size_t {
        unsafe { CGImageGetBitsPerPixel(self.as_ptr()) }
    }

    pub fn bytes_per_row(&self) -> size_t {
        unsafe { CGImageGetBytesPerRow(self.as_ptr()) }
    }

    pub fn color_space(&self) -> CGColorSpace {
        unsafe {
            let cs = CGImageGetColorSpace(self.as_ptr());
            CFRetain(cs as *mut _);
            CGColorSpace::from_ptr(cs)
        }
    }

    /// Returns the raw image bytes wrapped in `CFData`. Note, the returned `CFData` owns the
    /// underlying buffer.
    pub fn data(&self) -> CFData {
        let data_provider =
            unsafe { CGDataProviderRef::from_ptr(CGImageGetDataProvider(self.as_ptr())) };
        data_provider.copy_data()
    }

    /// Returns a cropped image. If the `rect` specifies a rectangle which lies outside of the
    /// image bounds, the `None` is returned.
    pub fn cropped(&self, rect: CGRect) -> Option<CGImage> {
        let image_ptr = unsafe { CGImageCreateWithImageInRect(self.as_ptr(), rect) };
        if !image_ptr.is_null() {
            Some(unsafe { CGImage::from_ptr(image_ptr) })
        } else {
            None
        }
    }
}

#[cfg_attr(feature = "link", link(name = "CoreGraphics", kind = "framework"))]
extern "C" {
    fn CGImageGetTypeID() -> CFTypeID;
    fn CGImageGetWidth(image: crate::sys::CGImageRef) -> size_t;
    fn CGImageGetHeight(image: crate::sys::CGImageRef) -> size_t;
    fn CGImageGetBitsPerComponent(image: crate::sys::CGImageRef) -> size_t;
    fn CGImageGetBitsPerPixel(image: crate::sys::CGImageRef) -> size_t;
    fn CGImageGetBytesPerRow(image: crate::sys::CGImageRef) -> size_t;
    fn CGImageGetColorSpace(image: crate::sys::CGImageRef) -> crate::sys::CGColorSpaceRef;
    fn CGImageGetDataProvider(image: crate::sys::CGImageRef) -> crate::sys::CGDataProviderRef;
    fn CGImageRelease(image: crate::sys::CGImageRef);
    fn CGImageCreate(
        width: size_t,
        height: size_t,
        bitsPerComponent: size_t,
        bitsPerPixel: size_t,
        bytesPerRow: size_t,
        space: crate::sys::CGColorSpaceRef,
        bitmapInfo: u32,
        provider: crate::sys::CGDataProviderRef,
        decode: *const CGFloat,
        shouldInterpolate: bool,
        intent: u32,
    ) -> crate::sys::CGImageRef;
    fn CGImageCreateWithImageInRect(
        image: crate::sys::CGImageRef,
        rect: CGRect,
    ) -> crate::sys::CGImageRef;

    //fn CGImageGetAlphaInfo(image: ::sys::CGImageRef) -> CGImageAlphaInfo;
    //fn CGImageCreateCopyWithColorSpace(image: ::sys::CGImageRef, space: ::sys::CGColorSpaceRef) -> ::sys::CGImageRef
}