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
|
//! Utilities for logging messages from the library.
#[macro_export]
macro_rules! rsvg_log {
(
$session:expr,
$($arg:tt)+
) => {
if $session.log_enabled() {
println!("{}", format_args!($($arg)+));
}
};
}
/// Captures the basic state of a [`cairo::Context`] for logging purposes.
///
/// A librsvg "transaction" like rendering a
/// [`crate::api::SvgHandle`], which takes a Cairo context, depends on the state of the
/// context as it was passed in by the caller. For example, librsvg may decide to
/// operate differently depending on the context's target surface type, or its current
/// transformation matrix. This struct captures that sort of information.
#[derive(Copy, Clone, Debug, PartialEq)]
struct CairoContextState {
surface_type: cairo::SurfaceType,
matrix: cairo::Matrix,
}
impl CairoContextState {
#[cfg(test)]
fn new(cr: &cairo::Context) -> Self {
let surface_type = cr.target().type_();
let matrix = cr.matrix();
Self {
surface_type,
matrix,
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn captures_cr_state() {
let surface = cairo::ImageSurface::create(cairo::Format::ARgb32, 10, 10).unwrap();
let cr = cairo::Context::new(&surface).unwrap();
let state = CairoContextState::new(&cr);
assert_eq!(
CairoContextState {
surface_type: cairo::SurfaceType::Image,
matrix: cairo::Matrix::identity(),
},
state,
);
let surface = cairo::RecordingSurface::create(cairo::Content::ColorAlpha, None).unwrap();
let cr = cairo::Context::new(&surface).unwrap();
cr.scale(2.0, 3.0);
let state = CairoContextState::new(&cr);
let mut matrix = cairo::Matrix::identity();
matrix.scale(2.0, 3.0);
assert_eq!(
CairoContextState {
surface_type: cairo::SurfaceType::Recording,
matrix,
},
state,
);
}
}
|