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- /*
- * jcmaster.h
- *
- * This file was part of the Independent JPEG Group's software:
- * Copyright (C) 1991-1997, Thomas G. Lane.
- * mozjpeg Modifications:
- * Copyright (C) 2014, Mozilla Corporation.
- * For conditions of distribution and use, see the accompanying README file.
- *
- * This file contains the master control structures for the JPEG compressor.
- */
- /* Private state */
- typedef enum {
- main_pass, /* input data, also do first output step */
- huff_opt_pass, /* Huffman code optimization pass */
- output_pass, /* data output pass */
- trellis_pass /* trellis quantization pass */
- } c_pass_type;
- typedef struct {
- struct jpeg_comp_master pub; /* public fields */
- c_pass_type pass_type; /* the type of the current pass */
- int pass_number; /* # of passes completed */
- int total_passes; /* total # of passes needed */
- int scan_number; /* current index in scan_info[] */
- /* fields for scan optimisation */
- int pass_number_scan_opt_base; /* pass number where scan optimization begins */
- unsigned char * scan_buffer[64]; /* buffer for a given scan */
- unsigned long scan_size[64]; /* size for a given scan */
- int actual_Al[64]; /* actual value of Al used for a scan */
- unsigned long best_cost; /* bit count for best frequency split */
- int best_freq_split_idx_luma; /* index for best frequency split (luma) */
- int best_freq_split_idx_chroma; /* index for best frequency split (chroma) */
- int best_Al_luma; /* best value for Al found in scan search (luma) */
- int best_Al_chroma; /* best value for Al found in scan search (luma) */
- boolean interleave_chroma_dc; /* indicate whether to interleave chroma DC scans */
- struct jpeg_destination_mgr * saved_dest; /* saved value of cinfo->dest */
- /*
- * This is here so we can add libjpeg-turbo version/build information to the
- * global string table without introducing a new global symbol. Adding this
- * information to the global string table allows one to examine a binary
- * object and determine which version of libjpeg-turbo it was built from or
- * linked against.
- */
- const char *jpeg_version;
- } my_comp_master;
- typedef my_comp_master * my_master_ptr;
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