Struct WebPPicture

#[repr(C)]
pub struct WebPPicture {

    pub use_argb: c_int,
    pub colorspace: WebPEncCSP,
    pub width: c_int,
    pub height: c_int,
    pub y: *mut u8,
    pub u: *mut u8,
    pub v: *mut u8,
    pub y_stride: c_int,
    pub uv_stride: c_int,
    pub a: *mut u8,
    pub a_stride: c_int,
    pub argb: *mut u32,
    pub argb_stride: c_int,
    pub writer: WebPWriterFunction,
    pub custom_ptr: *mut c_void,
    pub extra_info_type: c_int,
    pub extra_info: *mut u8,
    pub stats: *mut WebPAuxStats,
    pub error_code: WebPEncodingError,
    pub progress_hook: WebPProgressHook,
    pub user_data: *mut c_void,
    /* private fields */
}

Main exchange structure (input samples, output bytes, statistics)

Once WebPPictureInit() has been called, it’s ok to make all the INPUT fields (use_argb, y/u/v, argb, …) point to user-owned data, even if WebPPictureAlloc() has been called. Depending on the value use_argb, it’s guaranteed that either *argb or *y/*u/*v content will be kept untouched.

Fields

use_argb: c_int

Main flag for encoder selecting between ARGB or YUV input. It is recommended to use ARGB input (*argb, argb_stride) for lossless compression, and YUV input (*y, *u, *v, etc.) for lossy compression since these are the respective native colorspace for these formats.

colorspace: WebPEncCSP

colorspace: should be YUV420 for now (=Y’CbCr).

width: c_int

dimensions (less or equal to WEBP_MAX_DIMENSION)

height: c_int

dimensions (less or equal to WEBP_MAX_DIMENSION)

y: *mut u8

pointers to luma/chroma planes.

u: *mut u8

pointers to luma/chroma planes.

v: *mut u8

pointers to luma/chroma planes.

y_stride: c_int

luma/chroma strides.

uv_stride: c_int

luma/chroma strides.

a: *mut u8

pointer to the alpha plane

a_stride: c_int

stride of the alpha plane

argb: *mut u32

Pointer to argb (32 bit) plane.

argb_stride: c_int

This is stride in pixels units, not bytes.

writer: WebPWriterFunction

can be NULL

custom_ptr: *mut c_void

can be used by the writer.

extra_info_type: c_int

1: intra type, 2: segment, 3: quant 4: intra-16 prediction mode, 5: chroma prediction mode, 6: bit cost, 7: distortion

extra_info: *mut u8

if not NULL, points to an array of size ((width + 15) / 16) * ((height + 15) / 16) that will be filled with a macroblock map, depending on extra_info_type.

stats: *mut WebPAuxStats

Pointer to side statistics (updated only if not NULL)

error_code: WebPEncodingError

Error code for the latest error encountered during encoding

progress_hook: WebPProgressHook

If not NULL, report progress during encoding.

user_data: *mut c_void

this field is free to be set to any value and used during callbacks (like progress-report e.g.).

Trait Implementations

impl Clone for WebPPicture

fn clone(&self) -> WebPPicture

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for WebPPicture

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Copy for WebPPicture