browser_video_capture/
macros.rs

1#[macro_export]
2macro_rules! js_set {
3    ($target:expr, $field:literal, $value:expr) => {
4        web_sys::js_sys::Reflect::set(
5            $target.as_ref(),
6            &web_sys::wasm_bindgen::JsValue::from($field),
7            &$value.into(),
8        )
9        .unwrap()
10        .then_some(())
11        .unwrap();
12    };
13}
14
15#[macro_export]
16macro_rules! impl_canvas_capture_area {
17    ($name:ty) => {
18        impl crate::CaptureArea for $name {
19            fn capture_width(&self) -> u32 {
20                self.canvas.width()
21            }
22
23            fn capture_height(&self) -> u32 {
24                self.canvas.height()
25            }
26
27            fn set_capture_width(&self, width: u32) {
28                self.canvas.set_width(width);
29            }
30
31            fn set_capture_height(&self, height: u32) {
32                self.canvas.set_height(height);
33            }
34        }
35    };
36}
37
38#[macro_export]
39macro_rules! get_context {
40    ("2d" $name:literal, $canvas:expr, $options:expr) => {
41        $canvas.get_context_with_context_options("2d", &$options.into())
42    };
43    ("webgl" $name:literal, $canvas:expr, $options:expr) => {
44        $canvas.get_context_with_context_options(
45            $options
46                .experimental
47                .then_some(concat!($name, "-experimental"))
48                .unwrap_or($name),
49            &$options.into(),
50        )
51    };
52    ("webgl2" $name:literal, $canvas:expr, $options:expr) => {
53        $canvas.get_context_with_context_options(
54            $options
55                .experimental
56                .then_some(concat!($name, "-experimental"))
57                .unwrap_or($name),
58            &$options.into(),
59        )
60    };
61}
62
63#[macro_export]
64macro_rules! impl_capture_from_canvas {
65    ($id:tt, $capture:ty, $canvas:ty, $context:ty, $option:ty) => {
66        impl $capture {
67            pub fn from_canvas(canvas: $canvas, color: crate::CaptureColor) -> Result<Option<Self>, js_sys::Error> {
68                canvas
69                    .get_context($id)
70                    .map(|value| {
71                        value
72                            .map(|obj| obj.dyn_into::<$context>().unwrap())
73                            .map(|context| Self::new(canvas, context, color))
74                    })
75                    .map_err(|value| value.into())
76            }
77
78            pub fn from_canvas_with_options(
79                canvas: $canvas,
80                color: crate::CaptureColor,
81                options: $option,
82            ) -> Result<Option<Self>, js_sys::Error> {
83                get_context!($id $id, canvas, options)
84                    .map(|value| {
85                        value
86                            .map(|obj| obj.dyn_into::<$context>().unwrap())
87                            .map(|context| Self::new(canvas, context, color))
88                    })
89                    .map_err(|value| value.into())
90            }
91        }
92    };
93}
94
95#[macro_export]
96macro_rules! options_field {
97    ("" $obj:expr, $alias:literal, $value:expr) => {
98    };
99
100    ($field:tt $obj:expr, $alias:literal, $value:expr) => {
101        js_set!($obj, $alias, $value);
102    };
103}
104
105#[macro_export]
106macro_rules! impl_context_options {
107    ($name:tt $($alias:literal $field:tt: $typ:ty),+) => {
108        #[derive(Default, Debug, Clone, Copy, PartialEq, Eq)]
109        pub struct $name {
110            $(pub $field: $typ,)+
111        }
112
113        impl $name {
114            $(pub fn $field(mut self, value: $typ) -> Self {
115                self.$field = value;
116                self
117            })+
118        }
119
120        impl Into<JsValue> for $name {
121            fn into(self) -> JsValue {
122                let options = js_sys::Object::new();
123                $(options_field!($alias options, $alias, self.$field);)+
124                options.into()
125            }
126        }
127    };
128}
browser_video_capture/macros.rs

browser_video_capture/
macros.rs
