| 1 | /*
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| 2 | * jcmaster.c
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| 3 | *
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| 4 | * Copyright (C) 1991-1997, Thomas G. Lane.
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| 5 | * This file is part of the Independent JPEG Group's software.
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| 6 | * For conditions of distribution and use, see the accompanying README file.
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| 7 | *
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| 8 | * This file contains master control logic for the JPEG compressor.
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| 9 | * These routines are concerned with parameter validation, initial setup,
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| 10 | * and inter-pass control (determining the number of passes and the work
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| 11 | * to be done in each pass).
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| 12 | */
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| 13 |
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| 14 | #define JPEG_INTERNALS
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| 15 | #include "jinclude.h"
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| 16 | #include "jpeglib.h"
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| 17 |
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| 18 |
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| 19 | /* Private state */
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| 20 |
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| 21 | typedef enum {
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| 22 | main_pass, /* input data, also do first output step */
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| 23 | huff_opt_pass, /* Huffman code optimization pass */
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| 24 | output_pass /* data output pass */
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| 25 | } c_pass_type;
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| 26 |
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| 27 | typedef struct {
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| 28 | struct jpeg_comp_master pub; /* public fields */
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| 29 |
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| 30 | c_pass_type pass_type; /* the type of the current pass */
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| 31 |
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| 32 | int pass_number; /* # of passes completed */
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| 33 | int total_passes; /* total # of passes needed */
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| 34 |
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| 35 | int scan_number; /* current index in scan_info[] */
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| 36 | } my_comp_master;
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| 37 |
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| 38 | typedef my_comp_master * my_master_ptr;
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| 39 |
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| 40 |
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| 41 | /*
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| 42 | * Support routines that do various essential calculations.
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| 43 | */
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| 44 |
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| 45 | LOCAL(void)
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| 46 | initial_setup (j_compress_ptr cinfo)
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| 47 | /* Do computations that are needed before master selection phase */
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| 48 | {
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| 49 | int ci;
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| 50 | jpeg_component_info *compptr;
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| 51 | long samplesperrow;
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| 52 | JDIMENSION jd_samplesperrow;
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| 53 |
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| 54 | /* Sanity check on image dimensions */
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| 55 | if (cinfo->image_height <= 0 || cinfo->image_width <= 0
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| 56 | || cinfo->num_components <= 0 || cinfo->input_components <= 0)
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| 57 | ERREXIT(cinfo, JERR_EMPTY_IMAGE);
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| 58 |
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| 59 | /* Make sure image isn't bigger than I can handle */
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| 60 | if ((long) cinfo->image_height > (long) JPEG_MAX_DIMENSION ||
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| 61 | (long) cinfo->image_width > (long) JPEG_MAX_DIMENSION)
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| 62 | ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION);
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| 63 |
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| 64 | /* Width of an input scanline must be representable as JDIMENSION. */
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| 65 | samplesperrow = (long) cinfo->image_width * (long) cinfo->input_components;
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| 66 | jd_samplesperrow = (JDIMENSION) samplesperrow;
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| 67 | if ((long) jd_samplesperrow != samplesperrow)
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| 68 | ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
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| 69 |
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| 70 | /* For now, precision must match compiled-in value... */
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| 71 | if (cinfo->data_precision != BITS_IN_JSAMPLE)
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| 72 | ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
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| 73 |
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| 74 | /* Check that number of components won't exceed internal array sizes */
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| 75 | if (cinfo->num_components > MAX_COMPONENTS)
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| 76 | ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
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| 77 | MAX_COMPONENTS);
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| 78 |
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| 79 | /* Compute maximum sampling factors; check factor validity */
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| 80 | cinfo->max_h_samp_factor = 1;
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| 81 | cinfo->max_v_samp_factor = 1;
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| 82 | for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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| 83 | ci++, compptr++) {
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| 84 | if (compptr->h_samp_factor<=0 || compptr->h_samp_factor>MAX_SAMP_FACTOR ||
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| 85 | compptr->v_samp_factor<=0 || compptr->v_samp_factor>MAX_SAMP_FACTOR)
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| 86 | ERREXIT(cinfo, JERR_BAD_SAMPLING);
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| 87 | cinfo->max_h_samp_factor = MAX(cinfo->max_h_samp_factor,
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| 88 | compptr->h_samp_factor);
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| 89 | cinfo->max_v_samp_factor = MAX(cinfo->max_v_samp_factor,
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| 90 | compptr->v_samp_factor);
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| 91 | }
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| 92 |
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| 93 | /* Compute dimensions of components */
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| 94 | for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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| 95 | ci++, compptr++) {
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| 96 | /* Fill in the correct component_index value; don't rely on application */
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| 97 | compptr->component_index = ci;
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| 98 | /* For compression, we never do DCT scaling. */
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| 99 | compptr->DCT_scaled_size = DCTSIZE;
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| 100 | /* Size in DCT blocks */
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| 101 | compptr->width_in_blocks = (JDIMENSION)
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| 102 | jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor,
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| 103 | (long) (cinfo->max_h_samp_factor * DCTSIZE));
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| 104 | compptr->height_in_blocks = (JDIMENSION)
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| 105 | jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor,
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| 106 | (long) (cinfo->max_v_samp_factor * DCTSIZE));
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| 107 | /* Size in samples */
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| 108 | compptr->downsampled_width = (JDIMENSION)
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| 109 | jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor,
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| 110 | (long) cinfo->max_h_samp_factor);
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| 111 | compptr->downsampled_height = (JDIMENSION)
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| 112 | jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor,
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| 113 | (long) cinfo->max_v_samp_factor);
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| 114 | /* Mark component needed (this flag isn't actually used for compression) */
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| 115 | compptr->component_needed = TRUE;
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| 116 | }
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| 117 |
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| 118 | /* Compute number of fully interleaved MCU rows (number of times that
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| 119 | * main controller will call coefficient controller).
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| 120 | */
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| 121 | cinfo->total_iMCU_rows = (JDIMENSION)
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| 122 | jdiv_round_up((long) cinfo->image_height,
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| 123 | (long) (cinfo->max_v_samp_factor*DCTSIZE));
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| 124 | }
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| 125 |
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| 126 |
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| 127 | #ifdef C_MULTISCAN_FILES_SUPPORTED
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| 128 |
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| 129 | LOCAL(void)
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| 130 | validate_script (j_compress_ptr cinfo)
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| 131 | /* Verify that the scan script in cinfo->scan_info[] is valid; also
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| 132 | * determine whether it uses progressive JPEG, and set cinfo->progressive_mode.
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| 133 | */
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| 134 | {
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| 135 | const jpeg_scan_info * scanptr;
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| 136 | int scanno, ncomps, ci, coefi, thisi;
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| 137 | int Ss, Se, Ah, Al;
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| 138 | boolean component_sent[MAX_COMPONENTS];
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| 139 | #ifdef C_PROGRESSIVE_SUPPORTED
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| 140 | int * last_bitpos_ptr;
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| 141 | int last_bitpos[MAX_COMPONENTS][DCTSIZE2];
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| 142 | /* -1 until that coefficient has been seen; then last Al for it */
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| 143 | #endif
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| 144 |
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| 145 | if (cinfo->num_scans <= 0)
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| 146 | ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, 0);
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| 147 |
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| 148 | /* For sequential JPEG, all scans must have Ss=0, Se=DCTSIZE2-1;
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| 149 | * for progressive JPEG, no scan can have this.
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| 150 | */
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| 151 | scanptr = cinfo->scan_info;
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| 152 | if (scanptr->Ss != 0 || scanptr->Se != DCTSIZE2-1) {
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| 153 | #ifdef C_PROGRESSIVE_SUPPORTED
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| 154 | cinfo->progressive_mode = TRUE;
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| 155 | last_bitpos_ptr = & last_bitpos[0][0];
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| 156 | for (ci = 0; ci < cinfo->num_components; ci++)
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| 157 | for (coefi = 0; coefi < DCTSIZE2; coefi++)
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| 158 | *last_bitpos_ptr++ = -1;
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| 159 | #else
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| 160 | ERREXIT(cinfo, JERR_NOT_COMPILED);
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| 161 | #endif
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| 162 | } else {
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| 163 | cinfo->progressive_mode = FALSE;
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| 164 | for (ci = 0; ci < cinfo->num_components; ci++)
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| 165 | component_sent[ci] = FALSE;
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| 166 | }
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| 167 |
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| 168 | for (scanno = 1; scanno <= cinfo->num_scans; scanptr++, scanno++) {
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| 169 | /* Validate component indexes */
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| 170 | ncomps = scanptr->comps_in_scan;
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| 171 | if (ncomps <= 0 || ncomps > MAX_COMPS_IN_SCAN)
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| 172 | ERREXIT2(cinfo, JERR_COMPONENT_COUNT, ncomps, MAX_COMPS_IN_SCAN);
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| 173 | for (ci = 0; ci < ncomps; ci++) {
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| 174 | thisi = scanptr->component_index[ci];
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| 175 | if (thisi < 0 || thisi >= cinfo->num_components)
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| 176 | ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
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| 177 | /* Components must appear in SOF order within each scan */
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| 178 | if (ci > 0 && thisi <= scanptr->component_index[ci-1])
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| 179 | ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
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| 180 | }
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| 181 | /* Validate progression parameters */
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| 182 | Ss = scanptr->Ss;
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| 183 | Se = scanptr->Se;
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| 184 | Ah = scanptr->Ah;
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| 185 | Al = scanptr->Al;
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| 186 | if (cinfo->progressive_mode) {
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| 187 | #ifdef C_PROGRESSIVE_SUPPORTED
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| 188 | /* The JPEG spec simply gives the ranges 0..13 for Ah and Al, but that
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| 189 | * seems wrong: the upper bound ought to depend on data precision.
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| 190 | * Perhaps they really meant 0..N+1 for N-bit precision.
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| 191 | * Here we allow 0..10 for 8-bit data; Al larger than 10 results in
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| 192 | * out-of-range reconstructed DC values during the first DC scan,
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| 193 | * which might cause problems for some decoders.
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| 194 | */
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| 195 | #if BITS_IN_JSAMPLE == 8
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| 196 | #define MAX_AH_AL 10
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| 197 | #else
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| 198 | #define MAX_AH_AL 13
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| 199 | #endif
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| 200 | if (Ss < 0 || Ss >= DCTSIZE2 || Se < Ss || Se >= DCTSIZE2 ||
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| 201 | Ah < 0 || Ah > MAX_AH_AL || Al < 0 || Al > MAX_AH_AL)
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| 202 | ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
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| 203 | if (Ss == 0) {
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| 204 | if (Se != 0) /* DC and AC together not OK */
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| 205 | ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
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| 206 | } else {
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| 207 | if (ncomps != 1) /* AC scans must be for only one component */
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| 208 | ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
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| 209 | }
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| 210 | for (ci = 0; ci < ncomps; ci++) {
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| 211 | last_bitpos_ptr = & last_bitpos[scanptr->component_index[ci]][0];
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| 212 | if (Ss != 0 && last_bitpos_ptr[0] < 0) /* AC without prior DC scan */
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| 213 | ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
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| 214 | for (coefi = Ss; coefi <= Se; coefi++) {
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| 215 | if (last_bitpos_ptr[coefi] < 0) {
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| 216 | /* first scan of this coefficient */
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| 217 | if (Ah != 0)
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| 218 | ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
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| 219 | } else {
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| 220 | /* not first scan */
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| 221 | if (Ah != last_bitpos_ptr[coefi] || Al != Ah-1)
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| 222 | ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
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| 223 | }
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| 224 | last_bitpos_ptr[coefi] = Al;
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| 225 | }
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| 226 | }
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| 227 | #endif
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| 228 | } else {
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| 229 | /* For sequential JPEG, all progression parameters must be these: */
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| 230 | if (Ss != 0 || Se != DCTSIZE2-1 || Ah != 0 || Al != 0)
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| 231 | ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
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| 232 | /* Make sure components are not sent twice */
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| 233 | for (ci = 0; ci < ncomps; ci++) {
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| 234 | thisi = scanptr->component_index[ci];
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| 235 | if (component_sent[thisi])
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| 236 | ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
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| 237 | component_sent[thisi] = TRUE;
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| 238 | }
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| 239 | }
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| 240 | }
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| 241 |
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| 242 | /* Now verify that everything got sent. */
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| 243 | if (cinfo->progressive_mode) {
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| 244 | #ifdef C_PROGRESSIVE_SUPPORTED
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| 245 | /* For progressive mode, we only check that at least some DC data
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| 246 | * got sent for each component; the spec does not require that all bits
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| 247 | * of all coefficients be transmitted. Would it be wiser to enforce
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| 248 | * transmission of all coefficient bits??
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| 249 | */
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| 250 | for (ci = 0; ci < cinfo->num_components; ci++) {
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| 251 | if (last_bitpos[ci][0] < 0)
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| 252 | ERREXIT(cinfo, JERR_MISSING_DATA);
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| 253 | }
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| 254 | #endif
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| 255 | } else {
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| 256 | for (ci = 0; ci < cinfo->num_components; ci++) {
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| 257 | if (! component_sent[ci])
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| 258 | ERREXIT(cinfo, JERR_MISSING_DATA);
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| 259 | }
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| 260 | }
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| 261 | }
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| 262 |
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| 263 | #endif /* C_MULTISCAN_FILES_SUPPORTED */
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| 264 |
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| 265 |
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| 266 | LOCAL(void)
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| 267 | select_scan_parameters (j_compress_ptr cinfo)
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| 268 | /* Set up the scan parameters for the current scan */
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| 269 | {
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| 270 | int ci;
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| 271 |
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| 272 | #ifdef C_MULTISCAN_FILES_SUPPORTED
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| 273 | if (cinfo->scan_info != NULL) {
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| 274 | /* Prepare for current scan --- the script is already validated */
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| 275 | my_master_ptr master = (my_master_ptr) cinfo->master;
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| 276 | const jpeg_scan_info * scanptr = cinfo->scan_info + master->scan_number;
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| 277 |
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| 278 | cinfo->comps_in_scan = scanptr->comps_in_scan;
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| 279 | for (ci = 0; ci < scanptr->comps_in_scan; ci++) {
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| 280 | cinfo->cur_comp_info[ci] =
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| 281 | &cinfo->comp_info[scanptr->component_index[ci]];
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| 282 | }
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| 283 | cinfo->Ss = scanptr->Ss;
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| 284 | cinfo->Se = scanptr->Se;
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| 285 | cinfo->Ah = scanptr->Ah;
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| 286 | cinfo->Al = scanptr->Al;
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| 287 | }
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| 288 | else
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| 289 | #endif
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| 290 | {
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| 291 | /* Prepare for single sequential-JPEG scan containing all components */
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| 292 | if (cinfo->num_components > MAX_COMPS_IN_SCAN)
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| 293 | ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
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| 294 | MAX_COMPS_IN_SCAN);
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| 295 | cinfo->comps_in_scan = cinfo->num_components;
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| 296 | for (ci = 0; ci < cinfo->num_components; ci++) {
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| 297 | cinfo->cur_comp_info[ci] = &cinfo->comp_info[ci];
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| 298 | }
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| 299 | cinfo->Ss = 0;
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| 300 | cinfo->Se = DCTSIZE2-1;
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| 301 | cinfo->Ah = 0;
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| 302 | cinfo->Al = 0;
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| 303 | }
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| 304 | }
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| 305 |
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| 306 |
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| 307 | LOCAL(void)
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| 308 | per_scan_setup (j_compress_ptr cinfo)
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| 309 | /* Do computations that are needed before processing a JPEG scan */
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| 310 | /* cinfo->comps_in_scan and cinfo->cur_comp_info[] are already set */
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| 311 | {
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| 312 | int ci, mcublks, tmp;
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| 313 | jpeg_component_info *compptr;
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| 314 |
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| 315 | if (cinfo->comps_in_scan == 1) {
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| 316 |
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| 317 | /* Noninterleaved (single-component) scan */
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| 318 | compptr = cinfo->cur_comp_info[0];
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| 319 |
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| 320 | /* Overall image size in MCUs */
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| 321 | cinfo->MCUs_per_row = compptr->width_in_blocks;
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| 322 | cinfo->MCU_rows_in_scan = compptr->height_in_blocks;
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| 323 |
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| 324 | /* For noninterleaved scan, always one block per MCU */
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| 325 | compptr->MCU_width = 1;
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| 326 | compptr->MCU_height = 1;
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| 327 | compptr->MCU_blocks = 1;
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| 328 | compptr->MCU_sample_width = DCTSIZE;
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| 329 | compptr->last_col_width = 1;
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| 330 | /* For noninterleaved scans, it is convenient to define last_row_height
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| 331 | * as the number of block rows present in the last iMCU row.
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| 332 | */
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| 333 | tmp = (int) (compptr->height_in_blocks % compptr->v_samp_factor);
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| 334 | if (tmp == 0) tmp = compptr->v_samp_factor;
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| 335 | compptr->last_row_height = tmp;
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| 336 |
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| 337 | /* Prepare array describing MCU composition */
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| 338 | cinfo->blocks_in_MCU = 1;
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| 339 | cinfo->MCU_membership[0] = 0;
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| 340 |
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| 341 | } else {
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| 342 |
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| 343 | /* Interleaved (multi-component) scan */
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| 344 | if (cinfo->comps_in_scan <= 0 || cinfo->comps_in_scan > MAX_COMPS_IN_SCAN)
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| 345 | ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->comps_in_scan,
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| 346 | MAX_COMPS_IN_SCAN);
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| 347 |
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| 348 | /* Overall image size in MCUs */
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| 349 | cinfo->MCUs_per_row = (JDIMENSION)
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| 350 | jdiv_round_up((long) cinfo->image_width,
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| 351 | (long) (cinfo->max_h_samp_factor*DCTSIZE));
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| 352 | cinfo->MCU_rows_in_scan = (JDIMENSION)
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| 353 | jdiv_round_up((long) cinfo->image_height,
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| 354 | (long) (cinfo->max_v_samp_factor*DCTSIZE));
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| 355 |
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| 356 | cinfo->blocks_in_MCU = 0;
|
|---|
| 357 |
|
|---|
| 358 | for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
|
|---|
| 359 | compptr = cinfo->cur_comp_info[ci];
|
|---|
| 360 | /* Sampling factors give # of blocks of component in each MCU */
|
|---|
| 361 | compptr->MCU_width = compptr->h_samp_factor;
|
|---|
| 362 | compptr->MCU_height = compptr->v_samp_factor;
|
|---|
| 363 | compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height;
|
|---|
| 364 | compptr->MCU_sample_width = compptr->MCU_width * DCTSIZE;
|
|---|
| 365 | /* Figure number of non-dummy blocks in last MCU column & row */
|
|---|
| 366 | tmp = (int) (compptr->width_in_blocks % compptr->MCU_width);
|
|---|
| 367 | if (tmp == 0) tmp = compptr->MCU_width;
|
|---|
| 368 | compptr->last_col_width = tmp;
|
|---|
| 369 | tmp = (int) (compptr->height_in_blocks % compptr->MCU_height);
|
|---|
| 370 | if (tmp == 0) tmp = compptr->MCU_height;
|
|---|
| 371 | compptr->last_row_height = tmp;
|
|---|
| 372 | /* Prepare array describing MCU composition */
|
|---|
| 373 | mcublks = compptr->MCU_blocks;
|
|---|
| 374 | if (cinfo->blocks_in_MCU + mcublks > C_MAX_BLOCKS_IN_MCU)
|
|---|
| 375 | ERREXIT(cinfo, JERR_BAD_MCU_SIZE);
|
|---|
| 376 | while (mcublks-- > 0) {
|
|---|
| 377 | cinfo->MCU_membership[cinfo->blocks_in_MCU++] = ci;
|
|---|
| 378 | }
|
|---|
| 379 | }
|
|---|
| 380 |
|
|---|
| 381 | }
|
|---|
| 382 |
|
|---|
| 383 | /* Convert restart specified in rows to actual MCU count. */
|
|---|
| 384 | /* Note that count must fit in 16 bits, so we provide limiting. */
|
|---|
| 385 | if (cinfo->restart_in_rows > 0) {
|
|---|
| 386 | long nominal = (long) cinfo->restart_in_rows * (long) cinfo->MCUs_per_row;
|
|---|
| 387 | cinfo->restart_interval = (unsigned int) MIN(nominal, 65535L);
|
|---|
| 388 | }
|
|---|
| 389 | }
|
|---|
| 390 |
|
|---|
| 391 |
|
|---|
| 392 | /*
|
|---|
| 393 | * Per-pass setup.
|
|---|
| 394 | * This is called at the beginning of each pass. We determine which modules
|
|---|
| 395 | * will be active during this pass and give them appropriate start_pass calls.
|
|---|
| 396 | * We also set is_last_pass to indicate whether any more passes will be
|
|---|
| 397 | * required.
|
|---|
| 398 | */
|
|---|
| 399 |
|
|---|
| 400 | METHODDEF(void)
|
|---|
| 401 | prepare_for_pass (j_compress_ptr cinfo)
|
|---|
| 402 | {
|
|---|
| 403 | my_master_ptr master = (my_master_ptr) cinfo->master;
|
|---|
| 404 |
|
|---|
| 405 | switch (master->pass_type) {
|
|---|
| 406 | case main_pass:
|
|---|
| 407 | /* Initial pass: will collect input data, and do either Huffman
|
|---|
| 408 | * optimization or data output for the first scan.
|
|---|
| 409 | */
|
|---|
| 410 | select_scan_parameters(cinfo);
|
|---|
| 411 | per_scan_setup(cinfo);
|
|---|
| 412 | if (! cinfo->raw_data_in) {
|
|---|
| 413 | (*cinfo->cconvert->start_pass) (cinfo);
|
|---|
| 414 | (*cinfo->downsample->start_pass) (cinfo);
|
|---|
| 415 | (*cinfo->prep->start_pass) (cinfo, JBUF_PASS_THRU);
|
|---|
| 416 | }
|
|---|
| 417 | (*cinfo->fdct->start_pass) (cinfo);
|
|---|
| 418 | (*cinfo->entropy->start_pass) (cinfo, cinfo->optimize_coding);
|
|---|
| 419 | (*cinfo->coef->start_pass) (cinfo,
|
|---|
| 420 | (master->total_passes > 1 ?
|
|---|
| 421 | JBUF_SAVE_AND_PASS : JBUF_PASS_THRU));
|
|---|
| 422 | (*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU);
|
|---|
| 423 | if (cinfo->optimize_coding) {
|
|---|
| 424 | /* No immediate data output; postpone writing frame/scan headers */
|
|---|
| 425 | master->pub.call_pass_startup = FALSE;
|
|---|
| 426 | } else {
|
|---|
| 427 | /* Will write frame/scan headers at first jpeg_write_scanlines call */
|
|---|
| 428 | master->pub.call_pass_startup = TRUE;
|
|---|
| 429 | }
|
|---|
| 430 | break;
|
|---|
| 431 | #ifdef ENTROPY_OPT_SUPPORTED
|
|---|
| 432 | case huff_opt_pass:
|
|---|
| 433 | /* Do Huffman optimization for a scan after the first one. */
|
|---|
| 434 | select_scan_parameters(cinfo);
|
|---|
| 435 | per_scan_setup(cinfo);
|
|---|
| 436 | if (cinfo->Ss != 0 || cinfo->Ah == 0 || cinfo->arith_code) {
|
|---|
| 437 | (*cinfo->entropy->start_pass) (cinfo, TRUE);
|
|---|
| 438 | (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST);
|
|---|
| 439 | master->pub.call_pass_startup = FALSE;
|
|---|
| 440 | break;
|
|---|
| 441 | }
|
|---|
| 442 | /* Special case: Huffman DC refinement scans need no Huffman table
|
|---|
| 443 | * and therefore we can skip the optimization pass for them.
|
|---|
| 444 | */
|
|---|
| 445 | master->pass_type = output_pass;
|
|---|
| 446 | master->pass_number++;
|
|---|
| 447 | /*FALLTHROUGH*/
|
|---|
| 448 | #endif
|
|---|
| 449 | case output_pass:
|
|---|
| 450 | /* Do a data-output pass. */
|
|---|
| 451 | /* We need not repeat per-scan setup if prior optimization pass did it. */
|
|---|
| 452 | if (! cinfo->optimize_coding) {
|
|---|
| 453 | select_scan_parameters(cinfo);
|
|---|
| 454 | per_scan_setup(cinfo);
|
|---|
| 455 | }
|
|---|
| 456 | (*cinfo->entropy->start_pass) (cinfo, FALSE);
|
|---|
| 457 | (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST);
|
|---|
| 458 | /* We emit frame/scan headers now */
|
|---|
| 459 | if (master->scan_number == 0)
|
|---|
| 460 | (*cinfo->marker->write_frame_header) (cinfo);
|
|---|
| 461 | (*cinfo->marker->write_scan_header) (cinfo);
|
|---|
| 462 | master->pub.call_pass_startup = FALSE;
|
|---|
| 463 | break;
|
|---|
| 464 | default:
|
|---|
| 465 | ERREXIT(cinfo, JERR_NOT_COMPILED);
|
|---|
| 466 | }
|
|---|
| 467 |
|
|---|
| 468 | master->pub.is_last_pass = (master->pass_number == master->total_passes-1);
|
|---|
| 469 |
|
|---|
| 470 | /* Set up progress monitor's pass info if present */
|
|---|
| 471 | if (cinfo->progress != NULL) {
|
|---|
| 472 | cinfo->progress->completed_passes = master->pass_number;
|
|---|
| 473 | cinfo->progress->total_passes = master->total_passes;
|
|---|
| 474 | }
|
|---|
| 475 | }
|
|---|
| 476 |
|
|---|
| 477 |
|
|---|
| 478 | /*
|
|---|
| 479 | * Special start-of-pass hook.
|
|---|
| 480 | * This is called by jpeg_write_scanlines if call_pass_startup is TRUE.
|
|---|
| 481 | * In single-pass processing, we need this hook because we don't want to
|
|---|
| 482 | * write frame/scan headers during jpeg_start_compress; we want to let the
|
|---|
| 483 | * application write COM markers etc. between jpeg_start_compress and the
|
|---|
| 484 | * jpeg_write_scanlines loop.
|
|---|
| 485 | * In multi-pass processing, this routine is not used.
|
|---|
| 486 | */
|
|---|
| 487 |
|
|---|
| 488 | METHODDEF(void)
|
|---|
| 489 | pass_startup (j_compress_ptr cinfo)
|
|---|
| 490 | {
|
|---|
| 491 | cinfo->master->call_pass_startup = FALSE; /* reset flag so call only once */
|
|---|
| 492 |
|
|---|
| 493 | (*cinfo->marker->write_frame_header) (cinfo);
|
|---|
| 494 | (*cinfo->marker->write_scan_header) (cinfo);
|
|---|
| 495 | }
|
|---|
| 496 |
|
|---|
| 497 |
|
|---|
| 498 | /*
|
|---|
| 499 | * Finish up at end of pass.
|
|---|
| 500 | */
|
|---|
| 501 |
|
|---|
| 502 | METHODDEF(void)
|
|---|
| 503 | finish_pass_master (j_compress_ptr cinfo)
|
|---|
| 504 | {
|
|---|
| 505 | my_master_ptr master = (my_master_ptr) cinfo->master;
|
|---|
| 506 |
|
|---|
| 507 | /* The entropy coder always needs an end-of-pass call,
|
|---|
| 508 | * either to analyze statistics or to flush its output buffer.
|
|---|
| 509 | */
|
|---|
| 510 | (*cinfo->entropy->finish_pass) (cinfo);
|
|---|
| 511 |
|
|---|
| 512 | /* Update state for next pass */
|
|---|
| 513 | switch (master->pass_type) {
|
|---|
| 514 | case main_pass:
|
|---|
| 515 | /* next pass is either output of scan 0 (after optimization)
|
|---|
| 516 | * or output of scan 1 (if no optimization).
|
|---|
| 517 | */
|
|---|
| 518 | master->pass_type = output_pass;
|
|---|
| 519 | if (! cinfo->optimize_coding)
|
|---|
| 520 | master->scan_number++;
|
|---|
| 521 | break;
|
|---|
| 522 | case huff_opt_pass:
|
|---|
| 523 | /* next pass is always output of current scan */
|
|---|
| 524 | master->pass_type = output_pass;
|
|---|
| 525 | break;
|
|---|
| 526 | case output_pass:
|
|---|
| 527 | /* next pass is either optimization or output of next scan */
|
|---|
| 528 | if (cinfo->optimize_coding)
|
|---|
| 529 | master->pass_type = huff_opt_pass;
|
|---|
| 530 | master->scan_number++;
|
|---|
| 531 | break;
|
|---|
| 532 | }
|
|---|
| 533 |
|
|---|
| 534 | master->pass_number++;
|
|---|
| 535 | }
|
|---|
| 536 |
|
|---|
| 537 |
|
|---|
| 538 | /*
|
|---|
| 539 | * Initialize master compression control.
|
|---|
| 540 | */
|
|---|
| 541 |
|
|---|
| 542 | GLOBAL(void)
|
|---|
| 543 | jinit_c_master_control (j_compress_ptr cinfo, boolean transcode_only)
|
|---|
| 544 | {
|
|---|
| 545 | my_master_ptr master;
|
|---|
| 546 |
|
|---|
| 547 | master = (my_master_ptr)
|
|---|
| 548 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
|
|---|
| 549 | SIZEOF(my_comp_master));
|
|---|
| 550 | cinfo->master = (struct jpeg_comp_master *) master;
|
|---|
| 551 | master->pub.prepare_for_pass = prepare_for_pass;
|
|---|
| 552 | master->pub.pass_startup = pass_startup;
|
|---|
| 553 | master->pub.finish_pass = finish_pass_master;
|
|---|
| 554 | master->pub.is_last_pass = FALSE;
|
|---|
| 555 |
|
|---|
| 556 | /* Validate parameters, determine derived values */
|
|---|
| 557 | initial_setup(cinfo);
|
|---|
| 558 |
|
|---|
| 559 | if (cinfo->scan_info != NULL) {
|
|---|
| 560 | #ifdef C_MULTISCAN_FILES_SUPPORTED
|
|---|
| 561 | validate_script(cinfo);
|
|---|
| 562 | #else
|
|---|
| 563 | ERREXIT(cinfo, JERR_NOT_COMPILED);
|
|---|
| 564 | #endif
|
|---|
| 565 | } else {
|
|---|
| 566 | cinfo->progressive_mode = FALSE;
|
|---|
| 567 | cinfo->num_scans = 1;
|
|---|
| 568 | }
|
|---|
| 569 |
|
|---|
| 570 | if (cinfo->progressive_mode) /* TEMPORARY HACK ??? */
|
|---|
| 571 | cinfo->optimize_coding = TRUE; /* assume default tables no good for progressive mode */
|
|---|
| 572 |
|
|---|
| 573 | /* Initialize my private state */
|
|---|
| 574 | if (transcode_only) {
|
|---|
| 575 | /* no main pass in transcoding */
|
|---|
| 576 | if (cinfo->optimize_coding)
|
|---|
| 577 | master->pass_type = huff_opt_pass;
|
|---|
| 578 | else
|
|---|
| 579 | master->pass_type = output_pass;
|
|---|
| 580 | } else {
|
|---|
| 581 | /* for normal compression, first pass is always this type: */
|
|---|
| 582 | master->pass_type = main_pass;
|
|---|
| 583 | }
|
|---|
| 584 | master->scan_number = 0;
|
|---|
| 585 | master->pass_number = 0;
|
|---|
| 586 | if (cinfo->optimize_coding)
|
|---|
| 587 | master->total_passes = cinfo->num_scans * 2;
|
|---|
| 588 | else
|
|---|
| 589 | master->total_passes = cinfo->num_scans;
|
|---|
| 590 | }
|
|---|
