libwebp-sys

使用 bindgen 将 FFI 绑定到 libwebp。

libwebp 使用 cc crate 构建。它需要一个 C 编译器，但不使用 cmake。

将 TARGET_CPU 环境变量设置为 native 或您所需的 CPU 架构以优化该 C 代码。

用法

将以下内容添加到您项目的 Cargo.toml

[dependencies]
libwebp-sys = "0.9"

或要求具有 SIMD 支持的新 CPU

[dependencies]
libwebp-sys = { version = "0.9", features = ["avx2", "sse41", "neon"] }

或要求 no_std 支持

libwebp-sys = { version = "0.9", default-features = false, features = ["parallel", "neon"] }

示例

编码

pub fn encode_webp(input_image: &[u8], width: u32, height: u32, quality: i32) -> Result<Vec<u8>> {
    unsafe {
	    let mut out_buf = std::ptr::null_mut();
	    let stride = width as i32 * 4;
	    let len = WebPEncodeRGBA(input_image.as_ptr(), width as i32, height as i32, stride, quality as f32, &mut out_buf);
	    Ok(std::slice::from_raw_parts(out_buf, len as usize).into())
    }
}

解码

pub fn decode_webp(buf: &[u8]) -> Result<Vec<u8>> {
	let mut width = 0;
	let mut height = 0;
	let len = buf.len();
	unsafe {
		WebPGetInfo(buf.as_ptr(), len, &mut width, &mut height);
		let out_buf = WebPDecodeRGBA(buf.as_ptr(), len, &mut width, &mut height);
	}
	Ok(std::slice::::from_raw_parts(out_buf, width * height * 4).into())
}