Struct mozjpeg_sys::jpeg_decompress_struct
source · #[repr(C)]pub struct jpeg_decompress_struct {Show 43 fields
pub common: jpeg_common_struct,
pub src: *mut jpeg_source_mgr,
pub image_width: JDIMENSION,
pub image_height: JDIMENSION,
pub num_components: c_int,
pub jpeg_color_space: J_COLOR_SPACE,
pub out_color_space: J_COLOR_SPACE,
pub scale_num: c_uint,
pub scale_denom: c_uint,
pub output_gamma: f64,
pub buffered_image: boolean,
pub raw_data_out: boolean,
pub dct_method: J_DCT_METHOD,
pub do_fancy_upsampling: boolean,
pub do_block_smoothing: boolean,
pub quantize_colors: boolean,
pub dither_mode: J_DITHER_MODE,
pub two_pass_quantize: boolean,
pub desired_number_of_colors: c_int,
pub enable_1pass_quant: boolean,
pub enable_external_quant: boolean,
pub enable_2pass_quant: boolean,
pub output_width: JDIMENSION,
pub output_height: JDIMENSION,
pub out_color_components: c_int,
pub output_components: c_int,
pub rec_outbuf_height: c_int,
pub actual_number_of_colors: c_int,
pub colormap: JSAMPARRAY_MUT,
pub output_scanline: JDIMENSION,
pub input_scan_number: c_int,
pub input_iMCU_row: JDIMENSION,
pub output_scan_number: c_int,
pub output_iMCU_row: JDIMENSION,
pub coef_bits: *mut c_void,
pub quant_tbl_ptrs: [*mut JQUANT_TBL; 4],
pub comp_info: *mut jpeg_component_info,
pub density_unit: u8,
pub X_density: u16,
pub Y_density: u16,
pub marker_list: *mut jpeg_marker_struct,
pub max_h_samp_factor: c_int,
pub max_v_samp_factor: c_int,
/* private fields */
}
Fields§
§common: jpeg_common_struct
§src: *mut jpeg_source_mgr
§image_width: JDIMENSION
Basic description of image — filled in by jpeg_read_header()
image_height: JDIMENSION
§num_components: c_int
§jpeg_color_space: J_COLOR_SPACE
§out_color_space: J_COLOR_SPACE
Decompression processing parameters — these fields must be set before calling jpeg_start_decompress(). Note that jpeg_read_header() initializes them to default values.
scale_num: c_uint
§scale_denom: c_uint
§output_gamma: f64
image gamma wanted in output
buffered_image: boolean
§raw_data_out: boolean
TRUE=downsampled data wanted
dct_method: J_DCT_METHOD
§do_fancy_upsampling: boolean
§do_block_smoothing: boolean
§quantize_colors: boolean
§dither_mode: J_DITHER_MODE
§two_pass_quantize: boolean
§desired_number_of_colors: c_int
§enable_1pass_quant: boolean
§enable_external_quant: boolean
§enable_2pass_quant: boolean
§output_width: JDIMENSION
Description of actual output image that will be returned to application. These fields are computed by jpeg_start_decompress(). You can also use jpeg_calc_output_dimensions() to determine these values in advance of calling jpeg_start_decompress().
output_height: JDIMENSION
§out_color_components: c_int
§output_components: c_int
§rec_outbuf_height: c_int
min recommended height of scanline buffer If the buffer passed to jpeg_read_scanlines() is less than this many rows high, space and time will be wasted due to unnecessary data copying. Usually rec_outbuf_height will be 1 or 2, at most 4.
actual_number_of_colors: c_int
§colormap: JSAMPARRAY_MUT
§output_scanline: JDIMENSION
Row index of next scanline to be read from jpeg_read_scanlines(). Application may use this to control its processing loop, e.g., “while (output_scanline < output_height)”.
input_scan_number: c_int
Current input scan number and number of iMCU rows completed in scan. These indicate the progress of the decompressor input side.
input_iMCU_row: JDIMENSION
§output_scan_number: c_int
§output_iMCU_row: JDIMENSION
§coef_bits: *mut c_void
Current progression status. coef_bits[c][i] indicates the precision with which component c’s DCT coefficient i (in zigzag order) is known. It is -1 when no data has yet been received, otherwise it is the point transform (shift) value for the most recent scan of the coefficient (thus, 0 at completion of the progression). This pointer is NULL when reading a non-progressive file.
quant_tbl_ptrs: [*mut JQUANT_TBL; 4]
Internal JPEG parameters — the application usually need not look at these fields. Note that the decompressor output side may not use any parameters that can change between scans.
comp_info: *mut jpeg_component_info
§density_unit: u8
§X_density: u16
§Y_density: u16
§marker_list: *mut jpeg_marker_struct
§max_h_samp_factor: c_int
These fields are computed during decompression startup
max_v_samp_factor: c_int