libwebp

This is a binding to the libwebp library.

Usage

Preparation

# Cargo.toml

[dependencies]
libwebp = { version = "0.1.2", features = ["0_6"] }

Simple decoding

use libwebp::WebPDecodeRGBA;

let data: &[u8];

let (width, height, buf) = WebPDecodeRGBA(data).unwrap();
eprintln!("width = {}, height = {}", width, height);
eprintln!(
    "top-left pixel: rgba({}, {}, {}, {})",
    buf[0],
    buf[1],
    buf[2],
    buf[3] as f64 / 255.0,
)

Simple encoding

use libwebp::WebPEncodeRGBA;

let buf: &[u8] = &[
    255, 255, 255, 255, // white
    255, 0, 0, 255, // red
    0, 255, 0, 255, // green
    0, 0, 255, 255, // blue
];
let data = WebPEncodeRGBA(buf, 2, 2, 8, 75.0).unwrap();
let lossless_data = WebPEncodeLosslessRGBA(buf, 2, 2, 8).unwrap();

Minimum Supported Rust Version (MSRV)

Rust 1.31.0

Features

• demux ... enables libwebpdemux functions.
• mux ... enables libwebpmux functions.
• 0_5 ... enables functions introduced in libwebp 0.5.0.
• 0_6 ... enables functions introduced in libwebp 0.6.0.
• 1_1 ... enables functions introduced in libwebp 1.1.0.
• static ... statically link against the bundled libwebp.
• extern-types ... enables #![feature(extern_types)].

Linking

If libwebp is found in the system, it links against the library. Otherwise it builds and links against the bundled libwebp.

In these cases, static link is preferred:

• For musl target.
• When cross-compiling.
• static feature is turned on.
• LIBWEBP_SYS_STATIC environment variable is set to 1 when building.

Related repositories

• https://github.com/qnighy/libwebp-sys2-rs
• https://github.com/qnighy/libwebp-image-rs

Completeness

• types.h
  • WebPMalloc
  • WebPFree
• decode.h
  • WebPGetDecoderVersion
  • WebPGetInfo
  • WebPDecode*
  • WebPDecodeYUV
  • WebPDecode*Into
  • WebPDecodeYUVInto
  • WEBP_CSP_MODE
  • WebPIsPremultipliedMode
  • WebPIsAlphaMode
  • WebPIsRGBMode
  • WebPRGBABuffer
  • WebPYUVABuffer
  • WebPDecBuffer
  • WebPInitDecBuffer
  • WebPFreeDecBuffer
  • VP8StatusCode
  • WebPIDecoder (internal memory)
  • WebPIDecoder (external memory)
  • WebPINewDecoder (internal memory)
  • WebPINewDecoder (external memory)
  • WebPINewRGB (internal memory)
  • WebPINewRGB (external memory)
  • WebPINewYUVA (internal memory)
  • WebPINewYUVA (external memory)
  • WebPIDelete
  • WebPIAppend
  • WebPIUpdate
  • WebPIDecGetRGB
  • WebPIDecGetYUVA
  • WebPIDecodedArea
  • WebPBitstreamFeatures
  • WebPGetFeatures
  • WebPDecoderOptions
  • WebPDecoderConfig
  • WebPInitDecoderConfig
  • WebPIDecode
  • WebPDecode
• encode.h
  • WebPGetEncoderVersion
  • WebPEncode*
  • WebPEncodeLossless*
  • WebPImageHint
  • WebPConfig
  • WebPPreset
  • WebPConfigInit
  • WebPConfigPreset
  • WebPConfigLosslessPreset
  • WebPValidateConfig
  • WebPAuxStats
  • WebPWriterFunction
  • WebPMemoryWriter
  • WebPMemoryWriterInit
  • WebPMemoryWriterClear
  • WebPMemoryWrite
  • WebPProgressHook
  • WebPEncCSP
  • WebPEncodingError
  • WEBP_MAX_DIMENSION
  • WebPPicture
  • WebPPictureInit
  • WebPPictureAlloc
  • WebPPictureFree
  • WebPPictureCopy
  • WebPPlaneDistortion
  • WebPPictureDistortion
  • WebPPictureCrop
  • WebPPictureView
  • WebPPictureIsView
  • WebPPictureRescale
  • WebPPictureImportRGB
  • WebPPictureImportRGBA
  • WebPPictureImportRGBX
  • WebPPictureImportBGR
  • WebPPictureImportBGRA
  • WebPPictureImportBGRX
  • WebPPictureARGBToYUVA
  • WebPPictureARGBToYUVADithered
  • WebPPictureSharpARGBToYUVA
  • WebPPictureSmartARGBToYUVA
  • WebPPictureYUVAToARGB
  • WebPCleanupTransparentArea
  • WebPPictureHasTransparency
  • WebPBlendAlpha
  • WebPEncode
• mux_types.h
  • Not at all
• demux.h
  • Not at all
• mux.h
  • Not at all