jcmaster.c File Reference

#include "jinclude.h"
#include "jpeglib.h"

Include dependency graph for jcmaster.c:

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Data Structures
struct	my_comp_master
Defines
#define	JPEG_INTERNALS
Typedefs
typedef my_comp_master *	my_master_ptr
Enumerations
enum	c_pass_type { main_pass, huff_opt_pass, output_pass }
Functions
METHODDEF void	finish_pass_master (j_compress_ptr cinfo)
LOCAL void	initial_setup (j_compress_ptr cinfo)
GLOBAL void	jinit_c_master_control (j_compress_ptr cinfo, boolean transcode_only)
METHODDEF void	pass_startup (j_compress_ptr cinfo)
LOCAL void	per_scan_setup (j_compress_ptr cinfo)
METHODDEF void	prepare_for_pass (j_compress_ptr cinfo)
LOCAL void	select_scan_parameters (j_compress_ptr cinfo)
LOCAL void	validate_script (j_compress_ptr cinfo)

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Define Documentation

#define JPEG_INTERNALS

Definition at line 14 of file jcmaster.c.

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Typedef Documentation

typedef my_comp_master* my_master_ptr

Definition at line 38 of file jcmaster.c. Referenced by finish_output_pass(), finish_pass_master(), jinit_c_master_control(), jinit_master_decompress(), master_selection(), prepare_for_output_pass(), prepare_for_pass(), and select_scan_parameters().

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Enumeration Type Documentation

enum c_pass_type

Enumeration values: main_pass  huff_opt_pass  output_pass  Definition at line 21 of file jcmaster.c. { main_pass, /* input data, also do first output step */ huff_opt_pass, /* Huffman code optimization pass */ output_pass /* data output pass */ } c_pass_type;

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Function Documentation

METHODDEF void finish_pass_master (  j_compress_ptr  cinfo  )

Definition at line 491 of file jcmaster.c. References jpeg_compress_struct::entropy, huff_opt_pass, j_compress_ptr, main_pass, jpeg_compress_struct::master, my_master_ptr, jpeg_compress_struct::optimize_coding, output_pass, my_comp_master::pass_number, my_comp_master::pass_type, and my_comp_master::scan_number. { my_master_ptr master = (my_master_ptr) cinfo->master; /* The entropy coder always needs an end-of-pass call, * either to analyze statistics or to flush its output buffer. */ (*cinfo->entropy->finish_pass) (cinfo); /* Update state for next pass */ switch (master->pass_type) { case main_pass: /* next pass is either output of scan 0 (after optimization) * or output of scan 1 (if no optimization). */ master->pass_type = output_pass; if (! cinfo->optimize_coding) master->scan_number++; break; case huff_opt_pass: /* next pass is always output of current scan */ master->pass_type = output_pass; break; case output_pass: /* next pass is either optimization or output of next scan */ if (cinfo->optimize_coding) master->pass_type = huff_opt_pass; master->scan_number++; break; } master->pass_number++; }

LOCAL void initial_setup (  j_compress_ptr  cinfo  )

Definition at line 46 of file jcmaster.c. References jpeg_compress_struct::comp_info, jpeg_component_info::component_index, jpeg_component_info::component_needed, jpeg_compress_struct::data_precision, jpeg_component_info::DCT_scaled_size, DCTSIZE, jpeg_component_info::downsampled_height, jpeg_component_info::downsampled_width, ERREXIT, ERREXIT1, ERREXIT2, jpeg_component_info::h_samp_factor, jpeg_component_info::height_in_blocks, jpeg_compress_struct::image_height, jpeg_compress_struct::image_width, jpeg_compress_struct::input_components, j_compress_ptr, JDIMENSION, jdiv_round_up(), JERR_BAD_PRECISION, JERR_EMPTY_IMAGE, JERR_IMAGE_TOO_BIG, JERR_WIDTH_OVERFLOW, JPEG_MAX_DIMENSION, MAX, MAX_COMPONENTS, jpeg_compress_struct::max_h_samp_factor, MAX_SAMP_FACTOR, jpeg_compress_struct::max_v_samp_factor, jpeg_compress_struct::num_components, jpeg_compress_struct::total_iMCU_rows, jpeg_component_info::v_samp_factor, and jpeg_component_info::width_in_blocks. { int ci; jpeg_component_info *compptr; long samplesperrow; JDIMENSION jd_samplesperrow; /* Sanity check on image dimensions */ if (cinfo->image_height <= 0 || cinfo->image_width <= 0 || cinfo->num_components <= 0 || cinfo->input_components <= 0) ERREXIT(cinfo, JERR_EMPTY_IMAGE); /* Make sure image isn't bigger than I can handle */ if ((long) cinfo->image_height > (long) JPEG_MAX_DIMENSION || (long) cinfo->image_width > (long) JPEG_MAX_DIMENSION) ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION); /* Width of an input scanline must be representable as JDIMENSION. */ samplesperrow = (long) cinfo->image_width * (long) cinfo->input_components; jd_samplesperrow = (JDIMENSION) samplesperrow; if ((long) jd_samplesperrow != samplesperrow) ERREXIT(cinfo, JERR_WIDTH_OVERFLOW); /* For now, precision must match compiled-in value... */ if (cinfo->data_precision != BITS_IN_JSAMPLE) ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision); /* Check that number of components won't exceed internal array sizes */ if (cinfo->num_components > MAX_COMPONENTS) ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components, MAX_COMPONENTS); /* Compute maximum sampling factors; check factor validity */ cinfo->max_h_samp_factor = 1; cinfo->max_v_samp_factor = 1; for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; ci++, compptr++) { if (compptr->h_samp_factor<=0 || compptr->h_samp_factor>MAX_SAMP_FACTOR || compptr->v_samp_factor<=0 || compptr->v_samp_factor>MAX_SAMP_FACTOR) ERREXIT(cinfo, JERR_BAD_SAMPLING); cinfo->max_h_samp_factor = MAX(cinfo->max_h_samp_factor, compptr->h_samp_factor); cinfo->max_v_samp_factor = MAX(cinfo->max_v_samp_factor, compptr->v_samp_factor); } /* Compute dimensions of components */ for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; ci++, compptr++) { /* Fill in the correct component_index value; don't rely on application */ compptr->component_index = ci; /* For compression, we never do DCT scaling. */ compptr->DCT_scaled_size = DCTSIZE; /* Size in DCT blocks */ compptr->width_in_blocks = (JDIMENSION) jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor, (long) (cinfo->max_h_samp_factor * DCTSIZE)); compptr->height_in_blocks = (JDIMENSION) jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor, (long) (cinfo->max_v_samp_factor * DCTSIZE)); /* Size in samples */ compptr->downsampled_width = (JDIMENSION) jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor, (long) cinfo->max_h_samp_factor); compptr->downsampled_height = (JDIMENSION) jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor, (long) cinfo->max_v_samp_factor); /* Mark component needed (this flag isn't actually used for compression) */ compptr->component_needed = TRUE; } /* Compute number of fully interleaved MCU rows (number of times that * main controller will call coefficient controller). */ cinfo->total_iMCU_rows = (JDIMENSION) jdiv_round_up((long) cinfo->image_height, (long) (cinfo->max_v_samp_factor*DCTSIZE)); }

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GLOBAL void jinit_c_master_control (  j_compress_ptr  cinfo, boolean  transcode_only )

Definition at line 531 of file jcmaster.c. References ERREXIT, initial_setup(), jpeg_comp_master::is_last_pass, j_common_ptr, j_compress_ptr, JERR_NOT_COMPILED, jpeg_compress_struct::master, my_master_ptr, jpeg_compress_struct::num_scans, jpeg_compress_struct::optimize_coding, my_comp_master::pass_number, my_comp_master::pass_type, jpeg_compress_struct::progressive_mode, my_comp_master::pub, jpeg_compress_struct::scan_info, my_comp_master::scan_number, SIZEOF, my_comp_master::total_passes, and validate_script(). Referenced by jinit_compress_master(), and transencode_master_selection(). { my_master_ptr master; master = (my_master_ptr) (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, SIZEOF(my_comp_master)); cinfo->master = (struct jpeg_comp_master *) master; master->pub.prepare_for_pass = prepare_for_pass; master->pub.pass_startup = pass_startup; master->pub.finish_pass = finish_pass_master; master->pub.is_last_pass = FALSE; /* Validate parameters, determine derived values */ initial_setup(cinfo); if (cinfo->scan_info != NULL) { #ifdef C_MULTISCAN_FILES_SUPPORTED validate_script(cinfo); #else ERREXIT(cinfo, JERR_NOT_COMPILED); #endif } else { cinfo->progressive_mode = FALSE; cinfo->num_scans = 1; } if (cinfo->progressive_mode) /* TEMPORARY HACK ??? */ cinfo->optimize_coding = TRUE; /* assume default tables no good for progressive mode */ /* Initialize my private state */ if (transcode_only) { /* no main pass in transcoding */ if (cinfo->optimize_coding) master->pass_type = huff_opt_pass; else master->pass_type = output_pass; } else { /* for normal compression, first pass is always this type: */ master->pass_type = main_pass; } master->scan_number = 0; master->pass_number = 0; if (cinfo->optimize_coding) master->total_passes = cinfo->num_scans * 2; else master->total_passes = cinfo->num_scans; }

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METHODDEF void pass_startup (  j_compress_ptr  cinfo  )

Definition at line 477 of file jcmaster.c. References jpeg_comp_master::call_pass_startup, j_compress_ptr, jpeg_compress_struct::marker, and jpeg_compress_struct::master. { cinfo->master->call_pass_startup = FALSE; /* reset flag so call only once */ (*cinfo->marker->write_frame_header) (cinfo); (*cinfo->marker->write_scan_header) (cinfo); }

LOCAL void per_scan_setup (  j_compress_ptr  cinfo  )

Definition at line 296 of file jcmaster.c. References jpeg_compress_struct::blocks_in_MCU, jpeg_compress_struct::comps_in_scan, jpeg_compress_struct::cur_comp_info, DCTSIZE, ERREXIT, ERREXIT2, jpeg_component_info::h_samp_factor, jpeg_component_info::height_in_blocks, jpeg_compress_struct::image_height, jpeg_compress_struct::image_width, j_compress_ptr, JDIMENSION, jdiv_round_up(), JERR_BAD_MCU_SIZE, L, jpeg_component_info::last_col_width, jpeg_component_info::last_row_height, MAX_COMPS_IN_SCAN, jpeg_compress_struct::max_h_samp_factor, jpeg_compress_struct::max_v_samp_factor, jpeg_component_info::MCU_blocks, jpeg_component_info::MCU_height, jpeg_compress_struct::MCU_membership, jpeg_compress_struct::MCU_rows_in_scan, jpeg_component_info::MCU_sample_width, jpeg_component_info::MCU_width, jpeg_compress_struct::MCUs_per_row, MIN, jpeg_compress_struct::restart_in_rows, jpeg_compress_struct::restart_interval, jpeg_component_info::v_samp_factor, and jpeg_component_info::width_in_blocks. { int ci, mcublks, tmp; jpeg_component_info *compptr; if (cinfo->comps_in_scan == 1) { /* Noninterleaved (single-component) scan */ compptr = cinfo->cur_comp_info[0]; /* Overall image size in MCUs */ cinfo->MCUs_per_row = compptr->width_in_blocks; cinfo->MCU_rows_in_scan = compptr->height_in_blocks; /* For noninterleaved scan, always one block per MCU */ compptr->MCU_width = 1; compptr->MCU_height = 1; compptr->MCU_blocks = 1; compptr->MCU_sample_width = DCTSIZE; compptr->last_col_width = 1; /* For noninterleaved scans, it is convenient to define last_row_height * as the number of block rows present in the last iMCU row. */ tmp = (int) (compptr->height_in_blocks % compptr->v_samp_factor); if (tmp == 0) tmp = compptr->v_samp_factor; compptr->last_row_height = tmp; /* Prepare array describing MCU composition */ cinfo->blocks_in_MCU = 1; cinfo->MCU_membership[0] = 0; } else { /* Interleaved (multi-component) scan */ if (cinfo->comps_in_scan <= 0 || cinfo->comps_in_scan > MAX_COMPS_IN_SCAN) ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->comps_in_scan, MAX_COMPS_IN_SCAN); /* Overall image size in MCUs */ cinfo->MCUs_per_row = (JDIMENSION) jdiv_round_up((long) cinfo->image_width, (long) (cinfo->max_h_samp_factor*DCTSIZE)); cinfo->MCU_rows_in_scan = (JDIMENSION) jdiv_round_up((long) cinfo->image_height, (long) (cinfo->max_v_samp_factor*DCTSIZE)); cinfo->blocks_in_MCU = 0; for (ci = 0; ci < cinfo->comps_in_scan; ci++) { compptr = cinfo->cur_comp_info[ci]; /* Sampling factors give # of blocks of component in each MCU */ compptr->MCU_width = compptr->h_samp_factor; compptr->MCU_height = compptr->v_samp_factor; compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height; compptr->MCU_sample_width = compptr->MCU_width * DCTSIZE; /* Figure number of non-dummy blocks in last MCU column & row */ tmp = (int) (compptr->width_in_blocks % compptr->MCU_width); if (tmp == 0) tmp = compptr->MCU_width; compptr->last_col_width = tmp; tmp = (int) (compptr->height_in_blocks % compptr->MCU_height); if (tmp == 0) tmp = compptr->MCU_height; compptr->last_row_height = tmp; /* Prepare array describing MCU composition */ mcublks = compptr->MCU_blocks; if (cinfo->blocks_in_MCU + mcublks > C_MAX_BLOCKS_IN_MCU) ERREXIT(cinfo, JERR_BAD_MCU_SIZE); while (mcublks-- > 0) { cinfo->MCU_membership[cinfo->blocks_in_MCU++] = ci; } } } /* Convert restart specified in rows to actual MCU count. */ /* Note that count must fit in 16 bits, so we provide limiting. */ if (cinfo->restart_in_rows > 0) { long nominal = (long) cinfo->restart_in_rows * (long) cinfo->MCUs_per_row; cinfo->restart_interval = (unsigned int) MIN(nominal, 65535L); } }

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METHODDEF void prepare_for_pass (  j_compress_ptr  cinfo  )

Definition at line 389 of file jcmaster.c. References jpeg_compress_struct::Ah, jpeg_compress_struct::arith_code, jpeg_comp_master::call_pass_startup, jpeg_compress_struct::cconvert, jpeg_compress_struct::coef, jpeg_compress_struct::downsample, jpeg_compress_struct::entropy, ERREXIT, jpeg_compress_struct::fdct, huff_opt_pass, jpeg_comp_master::is_last_pass, j_compress_ptr, JBUF_SAVE_AND_PASS, JERR_NOT_COMPILED, jpeg_compress_struct::main, main_pass, jpeg_compress_struct::marker, jpeg_compress_struct::master, my_master_ptr, jpeg_compress_struct::optimize_coding, output_pass, my_comp_master::pass_number, my_comp_master::pass_type, per_scan_setup(), jpeg_compress_struct::prep, my_comp_master::pub, jpeg_compress_struct::raw_data_in, my_comp_master::scan_number, select_scan_parameters(), jpeg_compress_struct::Ss, and my_comp_master::total_passes. { my_master_ptr master = (my_master_ptr) cinfo->master; switch (master->pass_type) { case main_pass: /* Initial pass: will collect input data, and do either Huffman * optimization or data output for the first scan. */ select_scan_parameters(cinfo); per_scan_setup(cinfo); if (! cinfo->raw_data_in) { (*cinfo->cconvert->start_pass) (cinfo); (*cinfo->downsample->start_pass) (cinfo); (*cinfo->prep->start_pass) (cinfo, JBUF_PASS_THRU); } (*cinfo->fdct->start_pass) (cinfo); (*cinfo->entropy->start_pass) (cinfo, cinfo->optimize_coding); (*cinfo->coef->start_pass) (cinfo, (master->total_passes > 1 ? JBUF_SAVE_AND_PASS : JBUF_PASS_THRU)); (*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU); if (cinfo->optimize_coding) { /* No immediate data output; postpone writing frame/scan headers */ master->pub.call_pass_startup = FALSE; } else { /* Will write frame/scan headers at first jpeg_write_scanlines call */ master->pub.call_pass_startup = TRUE; } break; #ifdef ENTROPY_OPT_SUPPORTED case huff_opt_pass: /* Do Huffman optimization for a scan after the first one. */ select_scan_parameters(cinfo); per_scan_setup(cinfo); if (cinfo->Ss != 0 || cinfo->Ah == 0 || cinfo->arith_code) { (*cinfo->entropy->start_pass) (cinfo, TRUE); (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST); master->pub.call_pass_startup = FALSE; break; } /* Special case: Huffman DC refinement scans need no Huffman table * and therefore we can skip the optimization pass for them. */ master->pass_type = output_pass; master->pass_number++; /*FALLTHROUGH*/ #endif case output_pass: /* Do a data-output pass. */ /* We need not repeat per-scan setup if prior optimization pass did it. */ if (! cinfo->optimize_coding) { select_scan_parameters(cinfo); per_scan_setup(cinfo); } (*cinfo->entropy->start_pass) (cinfo, FALSE); (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST); /* We emit frame/scan headers now */ if (master->scan_number == 0) (*cinfo->marker->write_frame_header) (cinfo); (*cinfo->marker->write_scan_header) (cinfo); master->pub.call_pass_startup = FALSE; break; default: ERREXIT(cinfo, JERR_NOT_COMPILED); } master->pub.is_last_pass = (master->pass_number == master->total_passes-1); /* Set up progress monitor's pass info if present */ if (cinfo->progress != NULL) { cinfo->progress->completed_passes = master->pass_number; cinfo->progress->total_passes = master->total_passes; } }

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LOCAL void select_scan_parameters (  j_compress_ptr  cinfo  )

Definition at line 255 of file jcmaster.c. References jpeg_scan_info::Ah, jpeg_compress_struct::Ah, jpeg_scan_info::Al, jpeg_compress_struct::Al, jpeg_compress_struct::comp_info, jpeg_scan_info::component_index, jpeg_scan_info::comps_in_scan, jpeg_compress_struct::comps_in_scan, jpeg_compress_struct::cur_comp_info, DCTSIZE2, ERREXIT2, j_compress_ptr, jpeg_compress_struct::master, MAX_COMPS_IN_SCAN, my_master_ptr, jpeg_compress_struct::num_components, jpeg_compress_struct::scan_info, my_comp_master::scan_number, jpeg_scan_info::Se, jpeg_compress_struct::Se, jpeg_scan_info::Ss, and jpeg_compress_struct::Ss. Referenced by prepare_for_pass(). { int ci; #ifdef C_MULTISCAN_FILES_SUPPORTED if (cinfo->scan_info != NULL) { /* Prepare for current scan --- the script is already validated */ my_master_ptr master = (my_master_ptr) cinfo->master; const jpeg_scan_info * scanptr = cinfo->scan_info + master->scan_number; cinfo->comps_in_scan = scanptr->comps_in_scan; for (ci = 0; ci < scanptr->comps_in_scan; ci++) { cinfo->cur_comp_info[ci] = &cinfo->comp_info[scanptr->component_index[ci]]; } cinfo->Ss = scanptr->Ss; cinfo->Se = scanptr->Se; cinfo->Ah = scanptr->Ah; cinfo->Al = scanptr->Al; } else #endif { /* Prepare for single sequential-JPEG scan containing all components */ if (cinfo->num_components > MAX_COMPS_IN_SCAN) ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components, MAX_COMPS_IN_SCAN); cinfo->comps_in_scan = cinfo->num_components; for (ci = 0; ci < cinfo->num_components; ci++) { cinfo->cur_comp_info[ci] = &cinfo->comp_info[ci]; } cinfo->Ss = 0; cinfo->Se = DCTSIZE2-1; cinfo->Ah = 0; cinfo->Al = 0; } }

LOCAL void validate_script (  j_compress_ptr  cinfo  )

Definition at line 130 of file jcmaster.c. References jpeg_scan_info::Ah, Ah, jpeg_scan_info::Al, Al, jpeg_scan_info::component_index, jpeg_scan_info::comps_in_scan, DCTSIZE2, ERREXIT, ERREXIT1, ERREXIT2, j_compress_ptr, JERR_MISSING_DATA, JERR_NOT_COMPILED, MAX_COMPS_IN_SCAN, jpeg_compress_struct::num_components, jpeg_compress_struct::num_scans, jpeg_compress_struct::progressive_mode, jpeg_compress_struct::scan_info, Se, jpeg_scan_info::Se, Ss, and jpeg_scan_info::Ss. Referenced by jinit_c_master_control(). { const jpeg_scan_info * scanptr; int scanno, ncomps, ci, coefi, thisi; int Ss, Se, Ah, Al; boolean component_sent[MAX_COMPONENTS]; #ifdef C_PROGRESSIVE_SUPPORTED int * last_bitpos_ptr; int last_bitpos[MAX_COMPONENTS][DCTSIZE2]; /* -1 until that coefficient has been seen; then last Al for it */ #endif if (cinfo->num_scans <= 0) ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, 0); /* For sequential JPEG, all scans must have Ss=0, Se=DCTSIZE2-1; * for progressive JPEG, no scan can have this. */ scanptr = cinfo->scan_info; if (scanptr->Ss != 0 || scanptr->Se != DCTSIZE2-1) { #ifdef C_PROGRESSIVE_SUPPORTED cinfo->progressive_mode = TRUE; last_bitpos_ptr = & last_bitpos[0][0]; for (ci = 0; ci < cinfo->num_components; ci++) for (coefi = 0; coefi < DCTSIZE2; coefi++) *last_bitpos_ptr++ = -1; #else ERREXIT(cinfo, JERR_NOT_COMPILED); #endif } else { cinfo->progressive_mode = FALSE; for (ci = 0; ci < cinfo->num_components; ci++) component_sent[ci] = FALSE; } for (scanno = 1; scanno <= cinfo->num_scans; scanptr++, scanno++) { /* Validate component indexes */ ncomps = scanptr->comps_in_scan; if (ncomps <= 0 || ncomps > MAX_COMPS_IN_SCAN) ERREXIT2(cinfo, JERR_COMPONENT_COUNT, ncomps, MAX_COMPS_IN_SCAN); for (ci = 0; ci < ncomps; ci++) { thisi = scanptr->component_index[ci]; if (thisi < 0 || thisi >= cinfo->num_components) ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno); /* Components must appear in SOF order within each scan */ if (ci > 0 && thisi <= scanptr->component_index[ci-1]) ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno); } /* Validate progression parameters */ Ss = scanptr->Ss; Se = scanptr->Se; Ah = scanptr->Ah; Al = scanptr->Al; if (cinfo->progressive_mode) { #ifdef C_PROGRESSIVE_SUPPORTED if (Ss < 0 || Ss >= DCTSIZE2 || Se < Ss || Se >= DCTSIZE2 || Ah < 0 || Ah > 13 || Al < 0 || Al > 13) ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); if (Ss == 0) { if (Se != 0) /* DC and AC together not OK */ ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); } else { if (ncomps != 1) /* AC scans must be for only one component */ ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); } for (ci = 0; ci < ncomps; ci++) { last_bitpos_ptr = & last_bitpos[scanptr->component_index[ci]][0]; if (Ss != 0 && last_bitpos_ptr[0] < 0) /* AC without prior DC scan */ ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); for (coefi = Ss; coefi <= Se; coefi++) { if (last_bitpos_ptr[coefi] < 0) { /* first scan of this coefficient */ if (Ah != 0) ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); } else { /* not first scan */ if (Ah != last_bitpos_ptr[coefi] || Al != Ah-1) ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); } last_bitpos_ptr[coefi] = Al; } } #endif } else { /* For sequential JPEG, all progression parameters must be these: */ if (Ss != 0 || Se != DCTSIZE2-1 || Ah != 0 || Al != 0) ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); /* Make sure components are not sent twice */ for (ci = 0; ci < ncomps; ci++) { thisi = scanptr->component_index[ci]; if (component_sent[thisi]) ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno); component_sent[thisi] = TRUE; } } } /* Now verify that everything got sent. */ if (cinfo->progressive_mode) { #ifdef C_PROGRESSIVE_SUPPORTED /* For progressive mode, we only check that at least some DC data * got sent for each component; the spec does not require that all bits * of all coefficients be transmitted. Would it be wiser to enforce * transmission of all coefficient bits?? */ for (ci = 0; ci < cinfo->num_components; ci++) { if (last_bitpos[ci][0] < 0) ERREXIT(cinfo, JERR_MISSING_DATA); } #endif } else { for (ci = 0; ci < cinfo->num_components; ci++) { if (! component_sent[ci]) ERREXIT(cinfo, JERR_MISSING_DATA); } } }

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