xcap 0.9.4

XCap is a cross-platform screen capture library written in Rust. It supports Linux (X11, Wayland), MacOS, and Windows. XCap supports screenshot and video recording (WIP).
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use image::RgbaImage;
use objc2_core_foundation::CGRect;
use objc2_core_graphics::{
    CGDataProvider, CGImage, CGWindowID, CGWindowImageOption, CGWindowListCreateImage,
    CGWindowListOption,
};

use crate::error::{XCapError, XCapResult};

pub fn capture(
    cg_rect: CGRect,
    list_option: CGWindowListOption,
    window_id: CGWindowID,
) -> XCapResult<RgbaImage> {
    let cg_image = CGWindowListCreateImage(
        cg_rect,
        list_option,
        window_id,
        CGWindowImageOption::Default,
    );

    let width = CGImage::width(cg_image.as_deref());
    let height = CGImage::height(cg_image.as_deref());
    let data_provider = CGImage::data_provider(cg_image.as_deref());

    let data = CGDataProvider::data(data_provider.as_deref())
        .ok_or_else(|| XCapError::new("Failed to copy data"))?
        .to_vec();

    let bytes_per_row = CGImage::bytes_per_row(cg_image.as_deref());

    // Some platforms e.g. MacOS can have extra bytes at the end of each row.
    // See
    // https://github.com/nashaofu/xcap/issues/29
    // https://github.com/nashaofu/xcap/issues/38
    let mut buffer = Vec::with_capacity(width * height * 4);
    for row in data.chunks_exact(bytes_per_row) {
        buffer.extend_from_slice(&row[..width * 4]);
    }

    for bgra in buffer.chunks_exact_mut(4) {
        bgra.swap(0, 2);
    }

    RgbaImage::from_raw(width as u32, height as u32, buffer)
        .ok_or_else(|| XCapError::new("RgbaImage::from_raw failed"))
}