Struct mozjpeg_sys::jpeg_component_info

source · [−]
#[repr(C)]
pub struct jpeg_component_info {
    pub component_id: c_int,
    pub component_index: c_int,
    pub h_samp_factor: c_int,
    pub v_samp_factor: c_int,
    pub quant_tbl_no: c_int,
    pub dc_tbl_no: c_int,
    pub ac_tbl_no: c_int,
    pub width_in_blocks: JDIMENSION,
    pub height_in_blocks: JDIMENSION,
    pub quant_table: *mut JQUANT_TBL,
    /* private fields */
}

Fields

component_id: c_int

identifier for this component (0..255)

component_index: c_int

its index in SOF or cinfo->comp_info[]

h_samp_factor: c_int

horizontal sampling factor (1..4)

v_samp_factor: c_int

vertical sampling factor (1..4)

quant_tbl_no: c_int

quantization table selector (0..3)

dc_tbl_no: c_int

DC entropy table selector (0..3)

These values may vary between scans. For compression, they must be supplied by parameter setup; for decompression, they are read from the SOS marker. The decompressor output side may not use these variables.

ac_tbl_no: c_int

AC entropy table selector (0..3)

width_in_blocks: JDIMENSIONheight_in_blocks: JDIMENSIONquant_table: *mut JQUANT_TBL

Trait Implementations

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