Struct mozjpeg_sys::jpeg_compress_struct

source ·

#[repr(C)]
pub struct jpeg_compress_struct {Show 37 fields
    pub common: jpeg_common_struct,
    pub dest: *mut jpeg_destination_mgr,
    pub image_width: JDIMENSION,
    pub image_height: JDIMENSION,
    pub input_components: c_int,
    pub in_color_space: J_COLOR_SPACE,
    pub input_gamma: f64,
    pub data_precision: c_int,
    pub num_components: c_int,
    pub jpeg_color_space: J_COLOR_SPACE,
    pub comp_info: *mut jpeg_component_info,
    pub quant_tbl_ptrs: [*mut JQUANT_TBL; 4],
    pub dc_huff_tbl_ptrs: [*mut JHUFF_TBL; 4],
    pub ac_huff_tbl_ptrs: [*mut JHUFF_TBL; 4],
    pub arith_dc_L: [u8; 16],
    pub arith_dc_U: [u8; 16],
    pub arith_ac_K: [u8; 16],
    pub num_scans: c_int,
    pub scan_info: *const jpeg_scan_info,
    pub raw_data_in: boolean,
    pub arith_code: boolean,
    pub optimize_coding: boolean,
    pub CCIR601_sampling: boolean,
    pub smoothing_factor: c_int,
    pub dct_method: J_DCT_METHOD,
    pub restart_interval: c_uint,
    pub restart_in_rows: c_int,
    pub write_JFIF_header: boolean,
    pub JFIF_major_version: u8,
    pub JFIF_minor_version: u8,
    pub density_unit: u8,
    pub X_density: u16,
    pub Y_density: u16,
    pub write_Adobe_marker: boolean,
    pub next_scanline: JDIMENSION,
    pub max_h_samp_factor: c_int,
    pub max_v_samp_factor: c_int,
    /* private fields */
}

Fields§

§common: jpeg_common_struct§dest: *mut jpeg_destination_mgr§image_width: JDIMENSION

Description of source image — these fields must be filled in by outer application before starting compression.

§image_height: JDIMENSION§input_components: c_int§in_color_space: J_COLOR_SPACE

in_color_space must be correct before you can even call jpeg_set_defaults().

§input_gamma: f64

image gamma of input image

§data_precision: c_int

bits of precision in image data

§num_components: c_int§jpeg_color_space: J_COLOR_SPACE§comp_info: *mut jpeg_component_info

comp_info[i] describes component that appears i’th in SOF

§quant_tbl_ptrs: [*mut JQUANT_TBL; 4]§dc_huff_tbl_ptrs: [*mut JHUFF_TBL; 4]

ptrs to coefficient quantization tables, or NULL if not defined, and corresponding scale factors (percentage, initialized 100).

§ac_huff_tbl_ptrs: [*mut JHUFF_TBL; 4]§arith_dc_L: [u8; 16]§arith_dc_U: [u8; 16]§arith_ac_K: [u8; 16]§num_scans: c_int§scan_info: *const jpeg_scan_info§raw_data_in: boolean

TRUE=caller supplies downsampled data

§arith_code: boolean§optimize_coding: boolean

TRUE=optimize entropy encoding parms

§CCIR601_sampling: boolean§smoothing_factor: c_int§dct_method: J_DCT_METHOD§restart_interval: c_uint

MCUs per restart, or 0 for no restart

§restart_in_rows: c_int§write_JFIF_header: boolean§JFIF_major_version: u8§JFIF_minor_version: u8§density_unit: u8§X_density: u16§Y_density: u16§write_Adobe_marker: boolean§next_scanline: JDIMENSION§max_h_samp_factor: c_int§max_v_samp_factor: c_int