1e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 2e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * jcmaster.c 3e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 4e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Copyright (C) 1991-1997, Thomas G. Lane. 5e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This file is part of the Independent JPEG Group's software. 6e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * For conditions of distribution and use, see the accompanying README file. 7e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * 8e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This file contains master control logic for the JPEG compressor. 9e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * These routines are concerned with parameter validation, initial setup, 10e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * and inter-pass control (determining the number of passes and the work 11e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * to be done in each pass). 12e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 13e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 14e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#define JPEG_INTERNALS 15e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#include "jinclude.h" 16e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#include "jpeglib.h" 17e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 18e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 19e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Private state */ 20e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 21e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovtypedef enum { 22e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov main_pass, /* input data, also do first output step */ 23e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov huff_opt_pass, /* Huffman code optimization pass */ 24e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov output_pass /* data output pass */ 25e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} c_pass_type; 26e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 27e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovtypedef struct { 28e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov struct jpeg_comp_master pub; /* public fields */ 29e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 30e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov c_pass_type pass_type; /* the type of the current pass */ 31e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 32e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int pass_number; /* # of passes completed */ 33e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int total_passes; /* total # of passes needed */ 34e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 35e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int scan_number; /* current index in scan_info[] */ 36e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} my_comp_master; 37e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 38e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovtypedef my_comp_master * my_master_ptr; 39e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 40e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 41e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 42e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Support routines that do various essential calculations. 43e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 44e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 45e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovLOCAL(void) 46e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovinitial_setup (j_compress_ptr cinfo) 47e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Do computations that are needed before master selection phase */ 48e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 49e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int ci; 50e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jpeg_component_info *compptr; 51e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov long samplesperrow; 52e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JDIMENSION jd_samplesperrow; 53e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 54e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Sanity check on image dimensions */ 55e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->image_height <= 0 || cinfo->image_width <= 0 56e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov || cinfo->num_components <= 0 || cinfo->input_components <= 0) 57e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_EMPTY_IMAGE); 58e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 59e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Make sure image isn't bigger than I can handle */ 60e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if ((long) cinfo->image_height > (long) JPEG_MAX_DIMENSION || 61e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (long) cinfo->image_width > (long) JPEG_MAX_DIMENSION) 62e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION); 63e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 64e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Width of an input scanline must be representable as JDIMENSION. */ 65e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov samplesperrow = (long) cinfo->image_width * (long) cinfo->input_components; 66e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jd_samplesperrow = (JDIMENSION) samplesperrow; 67e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if ((long) jd_samplesperrow != samplesperrow) 68e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_WIDTH_OVERFLOW); 69e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 70e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* For now, precision must match compiled-in value... */ 71e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->data_precision != BITS_IN_JSAMPLE) 72e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision); 73e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 74e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Check that number of components won't exceed internal array sizes */ 75e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->num_components > MAX_COMPONENTS) 76e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components, 77e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov MAX_COMPONENTS); 78e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 79e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Compute maximum sampling factors; check factor validity */ 80e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->max_h_samp_factor = 1; 81e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->max_v_samp_factor = 1; 82e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 83e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ci++, compptr++) { 84e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (compptr->h_samp_factor<=0 || compptr->h_samp_factor>MAX_SAMP_FACTOR || 85e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->v_samp_factor<=0 || compptr->v_samp_factor>MAX_SAMP_FACTOR) 86e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_BAD_SAMPLING); 87e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->max_h_samp_factor = MAX(cinfo->max_h_samp_factor, 88e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->h_samp_factor); 89e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->max_v_samp_factor = MAX(cinfo->max_v_samp_factor, 90e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->v_samp_factor); 91e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 92e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 93e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Compute dimensions of components */ 94e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 95e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ci++, compptr++) { 96e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Fill in the correct component_index value; don't rely on application */ 97e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->component_index = ci; 98e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* For compression, we never do DCT scaling. */ 99e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->DCT_scaled_size = DCTSIZE; 100e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Size in DCT blocks */ 101e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->width_in_blocks = (JDIMENSION) 102e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor, 103e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (long) (cinfo->max_h_samp_factor * DCTSIZE)); 104e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->height_in_blocks = (JDIMENSION) 105e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor, 106e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (long) (cinfo->max_v_samp_factor * DCTSIZE)); 107e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Size in samples */ 108e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->downsampled_width = (JDIMENSION) 109e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor, 110e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (long) cinfo->max_h_samp_factor); 111e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->downsampled_height = (JDIMENSION) 112e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor, 113e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (long) cinfo->max_v_samp_factor); 114e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Mark component needed (this flag isn't actually used for compression) */ 115e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->component_needed = TRUE; 116e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 117e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 118e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Compute number of fully interleaved MCU rows (number of times that 119e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * main controller will call coefficient controller). 120e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 121e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->total_iMCU_rows = (JDIMENSION) 122e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jdiv_round_up((long) cinfo->image_height, 123e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (long) (cinfo->max_v_samp_factor*DCTSIZE)); 124e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 125e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 126e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 127e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#ifdef C_MULTISCAN_FILES_SUPPORTED 128e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 129e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovLOCAL(void) 130e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovvalidate_script (j_compress_ptr cinfo) 131e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Verify that the scan script in cinfo->scan_info[] is valid; also 132e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * determine whether it uses progressive JPEG, and set cinfo->progressive_mode. 133e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 134e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 135e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov const jpeg_scan_info * scanptr; 136e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int scanno, ncomps, ci, coefi, thisi; 137e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int Ss, Se, Ah, Al; 138e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov boolean component_sent[MAX_COMPONENTS]; 139e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#ifdef C_PROGRESSIVE_SUPPORTED 140e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int * last_bitpos_ptr; 141e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int last_bitpos[MAX_COMPONENTS][DCTSIZE2]; 142e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* -1 until that coefficient has been seen; then last Al for it */ 143e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#endif 144e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 145e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->num_scans <= 0) 146e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, 0); 147e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 148e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* For sequential JPEG, all scans must have Ss=0, Se=DCTSIZE2-1; 149e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * for progressive JPEG, no scan can have this. 150e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 151e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov scanptr = cinfo->scan_info; 152e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (scanptr->Ss != 0 || scanptr->Se != DCTSIZE2-1) { 153e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#ifdef C_PROGRESSIVE_SUPPORTED 154e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->progressive_mode = TRUE; 155e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov last_bitpos_ptr = & last_bitpos[0][0]; 156e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0; ci < cinfo->num_components; ci++) 157e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (coefi = 0; coefi < DCTSIZE2; coefi++) 158e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov *last_bitpos_ptr++ = -1; 159e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#else 160e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_NOT_COMPILED); 161e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#endif 162e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 163e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->progressive_mode = FALSE; 164e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0; ci < cinfo->num_components; ci++) 165e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov component_sent[ci] = FALSE; 166e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 167e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 168e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (scanno = 1; scanno <= cinfo->num_scans; scanptr++, scanno++) { 169e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Validate component indexes */ 170e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ncomps = scanptr->comps_in_scan; 171e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (ncomps <= 0 || ncomps > MAX_COMPS_IN_SCAN) 172e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT2(cinfo, JERR_COMPONENT_COUNT, ncomps, MAX_COMPS_IN_SCAN); 173e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0; ci < ncomps; ci++) { 174e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov thisi = scanptr->component_index[ci]; 175e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (thisi < 0 || thisi >= cinfo->num_components) 176e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno); 177e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Components must appear in SOF order within each scan */ 178e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (ci > 0 && thisi <= scanptr->component_index[ci-1]) 179e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno); 180e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 181e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Validate progression parameters */ 182e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov Ss = scanptr->Ss; 183e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov Se = scanptr->Se; 184e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov Ah = scanptr->Ah; 185e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov Al = scanptr->Al; 186e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->progressive_mode) { 187e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#ifdef C_PROGRESSIVE_SUPPORTED 188e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* The JPEG spec simply gives the ranges 0..13 for Ah and Al, but that 189e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * seems wrong: the upper bound ought to depend on data precision. 190e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Perhaps they really meant 0..N+1 for N-bit precision. 191e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Here we allow 0..10 for 8-bit data; Al larger than 10 results in 192e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * out-of-range reconstructed DC values during the first DC scan, 193e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * which might cause problems for some decoders. 194e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 195e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#if BITS_IN_JSAMPLE == 8 196e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#define MAX_AH_AL 10 197e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#else 198e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#define MAX_AH_AL 13 199e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#endif 200e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (Ss < 0 || Ss >= DCTSIZE2 || Se < Ss || Se >= DCTSIZE2 || 201e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov Ah < 0 || Ah > MAX_AH_AL || Al < 0 || Al > MAX_AH_AL) 202e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); 203e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (Ss == 0) { 204e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (Se != 0) /* DC and AC together not OK */ 205e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); 206e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 207e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (ncomps != 1) /* AC scans must be for only one component */ 208e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); 209e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 210e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0; ci < ncomps; ci++) { 211e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov last_bitpos_ptr = & last_bitpos[scanptr->component_index[ci]][0]; 212e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (Ss != 0 && last_bitpos_ptr[0] < 0) /* AC without prior DC scan */ 213e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); 214e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (coefi = Ss; coefi <= Se; coefi++) { 215e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (last_bitpos_ptr[coefi] < 0) { 216e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* first scan of this coefficient */ 217e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (Ah != 0) 218e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); 219e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 220e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* not first scan */ 221e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (Ah != last_bitpos_ptr[coefi] || Al != Ah-1) 222e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); 223e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 224e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov last_bitpos_ptr[coefi] = Al; 225e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 226e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 227e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#endif 228e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 229e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* For sequential JPEG, all progression parameters must be these: */ 230e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (Ss != 0 || Se != DCTSIZE2-1 || Ah != 0 || Al != 0) 231e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); 232e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Make sure components are not sent twice */ 233e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0; ci < ncomps; ci++) { 234e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov thisi = scanptr->component_index[ci]; 235e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (component_sent[thisi]) 236e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno); 237e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov component_sent[thisi] = TRUE; 238e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 239e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 240e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 241e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 242e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Now verify that everything got sent. */ 243e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->progressive_mode) { 244e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#ifdef C_PROGRESSIVE_SUPPORTED 245e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* For progressive mode, we only check that at least some DC data 246e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * got sent for each component; the spec does not require that all bits 247e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * of all coefficients be transmitted. Would it be wiser to enforce 248e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * transmission of all coefficient bits?? 249e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 250e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0; ci < cinfo->num_components; ci++) { 251e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (last_bitpos[ci][0] < 0) 252e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_MISSING_DATA); 253e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 254e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#endif 255e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 256e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0; ci < cinfo->num_components; ci++) { 257e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! component_sent[ci]) 258e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_MISSING_DATA); 259e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 260e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 261e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 262e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 263e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#endif /* C_MULTISCAN_FILES_SUPPORTED */ 264e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 265e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 266e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovLOCAL(void) 267e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovselect_scan_parameters (j_compress_ptr cinfo) 268e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Set up the scan parameters for the current scan */ 269e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 270e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int ci; 271e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 272e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#ifdef C_MULTISCAN_FILES_SUPPORTED 273e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->scan_info != NULL) { 274e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Prepare for current scan --- the script is already validated */ 275e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov my_master_ptr master = (my_master_ptr) cinfo->master; 276e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov const jpeg_scan_info * scanptr = cinfo->scan_info + master->scan_number; 277e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 278e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->comps_in_scan = scanptr->comps_in_scan; 279e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0; ci < scanptr->comps_in_scan; ci++) { 280e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->cur_comp_info[ci] = 281e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov &cinfo->comp_info[scanptr->component_index[ci]]; 282e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 283e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->Ss = scanptr->Ss; 284e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->Se = scanptr->Se; 285e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->Ah = scanptr->Ah; 286e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->Al = scanptr->Al; 287e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 288e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov else 289e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#endif 290e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov { 291e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Prepare for single sequential-JPEG scan containing all components */ 292e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->num_components > MAX_COMPS_IN_SCAN) 293e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components, 294e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov MAX_COMPS_IN_SCAN); 295e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->comps_in_scan = cinfo->num_components; 296e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0; ci < cinfo->num_components; ci++) { 297e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->cur_comp_info[ci] = &cinfo->comp_info[ci]; 298e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 299e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->Ss = 0; 300e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->Se = DCTSIZE2-1; 301e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->Ah = 0; 302e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->Al = 0; 303e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 304e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 305e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 306e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 307e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovLOCAL(void) 308e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovper_scan_setup (j_compress_ptr cinfo) 309e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* Do computations that are needed before processing a JPEG scan */ 310e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* cinfo->comps_in_scan and cinfo->cur_comp_info[] are already set */ 311e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 312e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov int ci, mcublks, tmp; 313e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jpeg_component_info *compptr; 314e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 315e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->comps_in_scan == 1) { 316e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 317e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Noninterleaved (single-component) scan */ 318e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr = cinfo->cur_comp_info[0]; 319e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 320e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Overall image size in MCUs */ 321e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->MCUs_per_row = compptr->width_in_blocks; 322e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->MCU_rows_in_scan = compptr->height_in_blocks; 323e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 324e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* For noninterleaved scan, always one block per MCU */ 325e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->MCU_width = 1; 326e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->MCU_height = 1; 327e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->MCU_blocks = 1; 328e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->MCU_sample_width = DCTSIZE; 329e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->last_col_width = 1; 330e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* For noninterleaved scans, it is convenient to define last_row_height 331e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * as the number of block rows present in the last iMCU row. 332e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 333e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov tmp = (int) (compptr->height_in_blocks % compptr->v_samp_factor); 334e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (tmp == 0) tmp = compptr->v_samp_factor; 335e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->last_row_height = tmp; 336e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 337e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Prepare array describing MCU composition */ 338e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->blocks_in_MCU = 1; 339e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->MCU_membership[0] = 0; 340e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 341e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 342e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 343e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Interleaved (multi-component) scan */ 344e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->comps_in_scan <= 0 || cinfo->comps_in_scan > MAX_COMPS_IN_SCAN) 345e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->comps_in_scan, 346e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov MAX_COMPS_IN_SCAN); 347e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 348e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Overall image size in MCUs */ 349e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->MCUs_per_row = (JDIMENSION) 350e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jdiv_round_up((long) cinfo->image_width, 351e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (long) (cinfo->max_h_samp_factor*DCTSIZE)); 352e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->MCU_rows_in_scan = (JDIMENSION) 353e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov jdiv_round_up((long) cinfo->image_height, 354e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (long) (cinfo->max_v_samp_factor*DCTSIZE)); 355e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 356e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->blocks_in_MCU = 0; 357e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 358e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 359e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr = cinfo->cur_comp_info[ci]; 360e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Sampling factors give # of blocks of component in each MCU */ 361e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->MCU_width = compptr->h_samp_factor; 362e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->MCU_height = compptr->v_samp_factor; 363e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height; 364e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->MCU_sample_width = compptr->MCU_width * DCTSIZE; 365e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Figure number of non-dummy blocks in last MCU column & row */ 366e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov tmp = (int) (compptr->width_in_blocks % compptr->MCU_width); 367e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (tmp == 0) tmp = compptr->MCU_width; 368e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->last_col_width = tmp; 369e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov tmp = (int) (compptr->height_in_blocks % compptr->MCU_height); 370e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (tmp == 0) tmp = compptr->MCU_height; 371e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov compptr->last_row_height = tmp; 372e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Prepare array describing MCU composition */ 373e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov mcublks = compptr->MCU_blocks; 374e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->blocks_in_MCU + mcublks > C_MAX_BLOCKS_IN_MCU) 375e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_BAD_MCU_SIZE); 376e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov while (mcublks-- > 0) { 377e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->MCU_membership[cinfo->blocks_in_MCU++] = ci; 378e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 379e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 380e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 381e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 382e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 383e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Convert restart specified in rows to actual MCU count. */ 384e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Note that count must fit in 16 bits, so we provide limiting. */ 385e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->restart_in_rows > 0) { 386e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov long nominal = (long) cinfo->restart_in_rows * (long) cinfo->MCUs_per_row; 387e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->restart_interval = (unsigned int) MIN(nominal, 65535L); 388e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 389e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 390e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 391e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 392e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 393e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Per-pass setup. 394e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This is called at the beginning of each pass. We determine which modules 395e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * will be active during this pass and give them appropriate start_pass calls. 396e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * We also set is_last_pass to indicate whether any more passes will be 397e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * required. 398e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 399e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 400e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovMETHODDEF(void) 401e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovprepare_for_pass (j_compress_ptr cinfo) 402e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 403e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov my_master_ptr master = (my_master_ptr) cinfo->master; 404e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 405e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov switch (master->pass_type) { 406e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case main_pass: 407e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Initial pass: will collect input data, and do either Huffman 408e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * optimization or data output for the first scan. 409e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 410e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov select_scan_parameters(cinfo); 411e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov per_scan_setup(cinfo); 412e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! cinfo->raw_data_in) { 413e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->cconvert->start_pass) (cinfo); 414e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->downsample->start_pass) (cinfo); 415e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->prep->start_pass) (cinfo, JBUF_PASS_THRU); 416e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 417e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->fdct->start_pass) (cinfo); 418e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->entropy->start_pass) (cinfo, cinfo->optimize_coding); 419e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->coef->start_pass) (cinfo, 420e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (master->total_passes > 1 ? 421e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov JBUF_SAVE_AND_PASS : JBUF_PASS_THRU)); 422e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU); 423e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->optimize_coding) { 424e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* No immediate data output; postpone writing frame/scan headers */ 425e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pub.call_pass_startup = FALSE; 426e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 427e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Will write frame/scan headers at first jpeg_write_scanlines call */ 428e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pub.call_pass_startup = TRUE; 429e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 430e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 431e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#ifdef ENTROPY_OPT_SUPPORTED 432e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case huff_opt_pass: 433e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Do Huffman optimization for a scan after the first one. */ 434e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov select_scan_parameters(cinfo); 435e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov per_scan_setup(cinfo); 436e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->Ss != 0 || cinfo->Ah == 0 || cinfo->arith_code) { 437e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->entropy->start_pass) (cinfo, TRUE); 438e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST); 439e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pub.call_pass_startup = FALSE; 440e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 441e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 442e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Special case: Huffman DC refinement scans need no Huffman table 443e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * and therefore we can skip the optimization pass for them. 444e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 445e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pass_type = output_pass; 446e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pass_number++; 447e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /*FALLTHROUGH*/ 448e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#endif 449e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case output_pass: 450e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Do a data-output pass. */ 451e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* We need not repeat per-scan setup if prior optimization pass did it. */ 452e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! cinfo->optimize_coding) { 453e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov select_scan_parameters(cinfo); 454e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov per_scan_setup(cinfo); 455e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 456e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->entropy->start_pass) (cinfo, FALSE); 457e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST); 458e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* We emit frame/scan headers now */ 459e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (master->scan_number == 0) 460e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->marker->write_frame_header) (cinfo); 461e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->marker->write_scan_header) (cinfo); 462e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pub.call_pass_startup = FALSE; 463e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 464e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov default: 465e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_NOT_COMPILED); 466e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 467e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 468e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pub.is_last_pass = (master->pass_number == master->total_passes-1); 469e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 470e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Set up progress monitor's pass info if present */ 471e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->progress != NULL) { 472e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->progress->completed_passes = master->pass_number; 473e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->progress->total_passes = master->total_passes; 474e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 475e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 476e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 477e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 478e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 479e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Special start-of-pass hook. 480e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * This is called by jpeg_write_scanlines if call_pass_startup is TRUE. 481e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * In single-pass processing, we need this hook because we don't want to 482e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * write frame/scan headers during jpeg_start_compress; we want to let the 483e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * application write COM markers etc. between jpeg_start_compress and the 484e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * jpeg_write_scanlines loop. 485e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * In multi-pass processing, this routine is not used. 486e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 487e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 488e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovMETHODDEF(void) 489e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovpass_startup (j_compress_ptr cinfo) 490e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 491e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->master->call_pass_startup = FALSE; /* reset flag so call only once */ 492e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 493e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->marker->write_frame_header) (cinfo); 494e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->marker->write_scan_header) (cinfo); 495e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 496e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 497e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 498e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 499e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Finish up at end of pass. 500e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 501e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 502e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovMETHODDEF(void) 503e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovfinish_pass_master (j_compress_ptr cinfo) 504e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 505e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov my_master_ptr master = (my_master_ptr) cinfo->master; 506e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 507e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* The entropy coder always needs an end-of-pass call, 508e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * either to analyze statistics or to flush its output buffer. 509e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 510e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->entropy->finish_pass) (cinfo); 511e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 512e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Update state for next pass */ 513e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov switch (master->pass_type) { 514e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case main_pass: 515e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* next pass is either output of scan 0 (after optimization) 516e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * or output of scan 1 (if no optimization). 517e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 518e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pass_type = output_pass; 519e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (! cinfo->optimize_coding) 520e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->scan_number++; 521e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 522e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case huff_opt_pass: 523e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* next pass is always output of current scan */ 524e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pass_type = output_pass; 525e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 526e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov case output_pass: 527e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* next pass is either optimization or output of next scan */ 528e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->optimize_coding) 529e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pass_type = huff_opt_pass; 530e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->scan_number++; 531e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov break; 532e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 533e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 534e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pass_number++; 535e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 536e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 537e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 538e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov/* 539e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov * Initialize master compression control. 540e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov */ 541e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 542e6986e1e8d4a57987f47c215490cb080a65ee29aSvet GanovGLOBAL(void) 543e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganovjinit_c_master_control (j_compress_ptr cinfo, boolean transcode_only) 544e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov{ 545e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov my_master_ptr master; 546e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 547e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master = (my_master_ptr) 548e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 549e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov SIZEOF(my_comp_master)); 550e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->master = (struct jpeg_comp_master *) master; 551e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pub.prepare_for_pass = prepare_for_pass; 552e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pub.pass_startup = pass_startup; 553e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pub.finish_pass = finish_pass_master; 554e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pub.is_last_pass = FALSE; 555e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 556e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Validate parameters, determine derived values */ 557e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov initial_setup(cinfo); 558e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 559e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->scan_info != NULL) { 560e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#ifdef C_MULTISCAN_FILES_SUPPORTED 561e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov validate_script(cinfo); 562e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#else 563e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov ERREXIT(cinfo, JERR_NOT_COMPILED); 564e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov#endif 565e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 566e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->progressive_mode = FALSE; 567e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->num_scans = 1; 568e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 569e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 570e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->progressive_mode) /* TEMPORARY HACK ??? */ 571e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov cinfo->optimize_coding = TRUE; /* assume default tables no good for progressive mode */ 572e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov 573e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* Initialize my private state */ 574e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (transcode_only) { 575e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* no main pass in transcoding */ 576e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->optimize_coding) 577e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pass_type = huff_opt_pass; 578e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov else 579e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pass_type = output_pass; 580e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } else { 581e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov /* for normal compression, first pass is always this type: */ 582e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pass_type = main_pass; 583e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov } 584e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->scan_number = 0; 585e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->pass_number = 0; 586e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov if (cinfo->optimize_coding) 587e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->total_passes = cinfo->num_scans * 2; 588e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov else 589e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov master->total_passes = cinfo->num_scans; 590e6986e1e8d4a57987f47c215490cb080a65ee29aSvet Ganov} 591