77 lines
2.1 KiB
Rust
77 lines
2.1 KiB
Rust
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use super::sys;
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pub struct Image {
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pub(crate) inner: *mut sys::zbar_image_s,
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/// Set to store the data of inner, as it will otherwise be freed when the data is dropped.
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inner_data: Option<Vec<u8>>,
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}
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impl Image {
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/// Link: [`sys::zbar_image_create`]
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pub(crate) fn alloc() -> Self {
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Self {
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inner: unsafe { sys::zbar_image_create() },
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inner_data: None,
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}
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}
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/// Link: [`sys::zbar_image_set_format`]
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///
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/// A FourCC code can be given in the format:
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///
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/// ```no_run
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/// self.set_format(b"Y800")
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/// ````
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pub(crate) fn set_format(&mut self, fourcc: &[u8; 4]) {
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let fourcc: u64 = fourcc[0] as u64
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| ((fourcc[1] as u64) << 8)
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| ((fourcc[2] as u64) << 16)
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| ((fourcc[3] as u64) << 24);
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unsafe { sys::zbar_image_set_format(self.inner, fourcc) }
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}
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/// Link: [`sys::zbar_image_set_size`]
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fn set_size(&mut self, width: u32, height: u32) {
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unsafe { sys::zbar_image_set_size(self.inner, width, height) }
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}
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/// Link: [`sys::zbar_image_set_data`]
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///
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/// Accepts raw data in the configured format. See: [`Image::set_format`]
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fn set_data(&mut self, data: Vec<u8>) {
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unsafe {
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sys::zbar_image_set_data(
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self.inner,
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data.as_ptr().cast(),
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data.len() as u64,
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None,
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)
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}
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// keep data in self to avoid use after free when data goes out of scope
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let _ = self.inner_data.insert(data);
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}
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}
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#[cfg(feature = "image")]
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mod impls {
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use super::*;
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use image::{DynamicImage, GenericImageView};
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impl From<DynamicImage> for Image {
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fn from(value: DynamicImage) -> Self {
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let mut image = Self::alloc();
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let (width, height) = value.dimensions();
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image.set_size(width, height);
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image.set_format(b"Y800");
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image.set_data(value.to_luma8().into_raw());
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image
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}
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}
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}
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impl Drop for Image {
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fn drop(&mut self) {
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unsafe { sys::zbar_image_destroy(self.inner) }
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}
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}
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