#if !defined(_FX_JPEG_TURBO_) | |
/* | |
* jcmaster.c | |
* | |
* Copyright (C) 1991-1997, Thomas G. Lane. | |
* This file is part of the Independent JPEG Group's software. | |
* For conditions of distribution and use, see the accompanying README file. | |
* | |
* This file contains master control logic for the JPEG compressor. | |
* These routines are concerned with parameter validation, initial setup, | |
* and inter-pass control (determining the number of passes and the work | |
* to be done in each pass). | |
*/ | |
#define JPEG_INTERNALS | |
#include "jinclude.h" | |
#include "jpeglib.h" | |
/* Private state */ | |
typedef enum { | |
main_pass, /* input data, also do first output step */ | |
huff_opt_pass, /* Huffman code optimization pass */ | |
output_pass /* data output pass */ | |
} c_pass_type; | |
typedef struct { | |
struct jpeg_comp_master pub; /* public fields */ | |
c_pass_type pass_type; /* the type of the current pass */ | |
int pass_number; /* # of passes completed */ | |
int total_passes; /* total # of passes needed */ | |
int scan_number; /* current index in scan_info[] */ | |
} my_comp_master; | |
typedef my_comp_master * my_master_ptr; | |
/* | |
* Support routines that do various essential calculations. | |
*/ | |
LOCAL(void) | |
initial_setup (j_compress_ptr cinfo) | |
/* Do computations that are needed before master selection phase */ | |
{ | |
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)); | |
} | |
#ifdef C_MULTISCAN_FILES_SUPPORTED | |
LOCAL(void) | |
validate_script (j_compress_ptr cinfo) | |
/* Verify that the scan script in cinfo->scan_info[] is valid; also | |
* determine whether it uses progressive JPEG, and set cinfo->progressive_mode. | |
*/ | |
{ | |
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 | |
/* The JPEG spec simply gives the ranges 0..13 for Ah and Al, but that | |
* seems wrong: the upper bound ought to depend on data precision. | |
* Perhaps they really meant 0..N+1 for N-bit precision. | |
* Here we allow 0..10 for 8-bit data; Al larger than 10 results in | |
* out-of-range reconstructed DC values during the first DC scan, | |
* which might cause problems for some decoders. | |
*/ | |
#if BITS_IN_JSAMPLE == 8 | |
#define MAX_AH_AL 10 | |
#else | |
#define MAX_AH_AL 13 | |
#endif | |
if (Ss < 0 || Ss >= DCTSIZE2 || Se < Ss || Se >= DCTSIZE2 || | |
Ah < 0 || Ah > MAX_AH_AL || Al < 0 || Al > MAX_AH_AL) | |
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); | |
} | |
} | |
} | |
#endif /* C_MULTISCAN_FILES_SUPPORTED */ | |
LOCAL(void) | |
select_scan_parameters (j_compress_ptr cinfo) | |
/* Set up the scan parameters for the current scan */ | |
{ | |
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) | |
per_scan_setup (j_compress_ptr cinfo) | |
/* Do computations that are needed before processing a JPEG scan */ | |
/* cinfo->comps_in_scan and cinfo->cur_comp_info[] are already set */ | |
{ | |
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); | |
} | |
} | |
/* | |
* Per-pass setup. | |
* This is called at the beginning of each pass. We determine which modules | |
* will be active during this pass and give them appropriate start_pass calls. | |
* We also set is_last_pass to indicate whether any more passes will be | |
* required. | |
*/ | |
METHODDEF(void) | |
prepare_for_pass (j_compress_ptr cinfo) | |
{ | |
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; | |
} | |
} | |
/* | |
* Special start-of-pass hook. | |
* This is called by jpeg_write_scanlines if call_pass_startup is TRUE. | |
* In single-pass processing, we need this hook because we don't want to | |
* write frame/scan headers during jpeg_start_compress; we want to let the | |
* application write COM markers etc. between jpeg_start_compress and the | |
* jpeg_write_scanlines loop. | |
* In multi-pass processing, this routine is not used. | |
*/ | |
METHODDEF(void) | |
pass_startup (j_compress_ptr cinfo) | |
{ | |
cinfo->master->call_pass_startup = FALSE; /* reset flag so call only once */ | |
(*cinfo->marker->write_frame_header) (cinfo); | |
(*cinfo->marker->write_scan_header) (cinfo); | |
} | |
/* | |
* Finish up at end of pass. | |
*/ | |
METHODDEF(void) | |
finish_pass_master (j_compress_ptr cinfo) | |
{ | |
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++; | |
} | |
/* | |
* Initialize master compression control. | |
*/ | |
GLOBAL(void) | |
jinit_c_master_control (j_compress_ptr cinfo, boolean transcode_only) | |
{ | |
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; | |
} | |
#endif //_FX_JPEG_TURBO_ |