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
|
use std::convert::TryFrom;
use crate::{block::ColorTable, gif::Image, reader::DecodingError, Color};
pub struct ColorImage {
width: u16,
height: u16,
data: Vec<Pixel>,
}
impl ColorImage {
pub(crate) fn from_indicies(
width: u16,
height: u16,
indicies: &[u8],
table: &ColorTable,
transindex: Option<u8>,
) -> Result<Self, DecodingError> {
let mut data = vec![Pixel::Transparent; (width * height) as usize];
for (image_index, color_index) in indicies.into_iter().enumerate() {
if let Some(trans) = transindex {
if trans == *color_index {
data[image_index] = Pixel::Transparent;
}
} else {
data[image_index] = Pixel::Color(
table
.get(*color_index)
.ok_or(DecodingError::ColorIndexOutOfBounds)?,
);
}
}
Ok(ColorImage {
width,
height,
data,
})
}
}
impl<'a> TryFrom<Image<'a>> for ColorImage {
type Error = DecodingError;
fn try_from(img: Image<'a>) -> Result<Self, Self::Error> {
ColorImage::from_indicies(
img.width,
img.height,
img.indicies,
img.palette,
img.transparent_index,
)
}
}
#[derive(Copy, Clone, Debug, PartialEq)]
pub enum Pixel {
Color(Color),
Transparent,
}
|
