1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libjpeg/jcmaster.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,625 @@
1.4 +/*
1.5 + * jcmaster.c
1.6 + *
1.7 + * This file was part of the Independent JPEG Group's software:
1.8 + * Copyright (C) 1991-1997, Thomas G. Lane.
1.9 + * Modified 2003-2010 by Guido Vollbeding.
1.10 + * libjpeg-turbo Modifications:
1.11 + * Copyright (C) 2010, D. R. Commander.
1.12 + * For conditions of distribution and use, see the accompanying README file.
1.13 + *
1.14 + * This file contains master control logic for the JPEG compressor.
1.15 + * These routines are concerned with parameter validation, initial setup,
1.16 + * and inter-pass control (determining the number of passes and the work
1.17 + * to be done in each pass).
1.18 + */
1.19 +
1.20 +#define JPEG_INTERNALS
1.21 +#include "jinclude.h"
1.22 +#include "jpeglib.h"
1.23 +#include "jpegcomp.h"
1.24 +
1.25 +
1.26 +/* Private state */
1.27 +
1.28 +typedef enum {
1.29 + main_pass, /* input data, also do first output step */
1.30 + huff_opt_pass, /* Huffman code optimization pass */
1.31 + output_pass /* data output pass */
1.32 +} c_pass_type;
1.33 +
1.34 +typedef struct {
1.35 + struct jpeg_comp_master pub; /* public fields */
1.36 +
1.37 + c_pass_type pass_type; /* the type of the current pass */
1.38 +
1.39 + int pass_number; /* # of passes completed */
1.40 + int total_passes; /* total # of passes needed */
1.41 +
1.42 + int scan_number; /* current index in scan_info[] */
1.43 +} my_comp_master;
1.44 +
1.45 +typedef my_comp_master * my_master_ptr;
1.46 +
1.47 +
1.48 +/*
1.49 + * Support routines that do various essential calculations.
1.50 + */
1.51 +
1.52 +#if JPEG_LIB_VERSION >= 70
1.53 +/*
1.54 + * Compute JPEG image dimensions and related values.
1.55 + * NOTE: this is exported for possible use by application.
1.56 + * Hence it mustn't do anything that can't be done twice.
1.57 + */
1.58 +
1.59 +GLOBAL(void)
1.60 +jpeg_calc_jpeg_dimensions (j_compress_ptr cinfo)
1.61 +/* Do computations that are needed before master selection phase */
1.62 +{
1.63 + /* Hardwire it to "no scaling" */
1.64 + cinfo->jpeg_width = cinfo->image_width;
1.65 + cinfo->jpeg_height = cinfo->image_height;
1.66 + cinfo->min_DCT_h_scaled_size = DCTSIZE;
1.67 + cinfo->min_DCT_v_scaled_size = DCTSIZE;
1.68 +}
1.69 +#endif
1.70 +
1.71 +
1.72 +LOCAL(void)
1.73 +initial_setup (j_compress_ptr cinfo, boolean transcode_only)
1.74 +/* Do computations that are needed before master selection phase */
1.75 +{
1.76 + int ci;
1.77 + jpeg_component_info *compptr;
1.78 + long samplesperrow;
1.79 + JDIMENSION jd_samplesperrow;
1.80 +
1.81 +#if JPEG_LIB_VERSION >= 70
1.82 +#if JPEG_LIB_VERSION >= 80
1.83 + if (!transcode_only)
1.84 +#endif
1.85 + jpeg_calc_jpeg_dimensions(cinfo);
1.86 +#endif
1.87 +
1.88 + /* Sanity check on image dimensions */
1.89 + if (cinfo->_jpeg_height <= 0 || cinfo->_jpeg_width <= 0
1.90 + || cinfo->num_components <= 0 || cinfo->input_components <= 0)
1.91 + ERREXIT(cinfo, JERR_EMPTY_IMAGE);
1.92 +
1.93 + /* Make sure image isn't bigger than I can handle */
1.94 + if ((long) cinfo->_jpeg_height > (long) JPEG_MAX_DIMENSION ||
1.95 + (long) cinfo->_jpeg_width > (long) JPEG_MAX_DIMENSION)
1.96 + ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION);
1.97 +
1.98 + /* Width of an input scanline must be representable as JDIMENSION. */
1.99 + samplesperrow = (long) cinfo->image_width * (long) cinfo->input_components;
1.100 + jd_samplesperrow = (JDIMENSION) samplesperrow;
1.101 + if ((long) jd_samplesperrow != samplesperrow)
1.102 + ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
1.103 +
1.104 + /* For now, precision must match compiled-in value... */
1.105 + if (cinfo->data_precision != BITS_IN_JSAMPLE)
1.106 + ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
1.107 +
1.108 + /* Check that number of components won't exceed internal array sizes */
1.109 + if (cinfo->num_components > MAX_COMPONENTS)
1.110 + ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
1.111 + MAX_COMPONENTS);
1.112 +
1.113 + /* Compute maximum sampling factors; check factor validity */
1.114 + cinfo->max_h_samp_factor = 1;
1.115 + cinfo->max_v_samp_factor = 1;
1.116 + for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
1.117 + ci++, compptr++) {
1.118 + if (compptr->h_samp_factor<=0 || compptr->h_samp_factor>MAX_SAMP_FACTOR ||
1.119 + compptr->v_samp_factor<=0 || compptr->v_samp_factor>MAX_SAMP_FACTOR)
1.120 + ERREXIT(cinfo, JERR_BAD_SAMPLING);
1.121 + cinfo->max_h_samp_factor = MAX(cinfo->max_h_samp_factor,
1.122 + compptr->h_samp_factor);
1.123 + cinfo->max_v_samp_factor = MAX(cinfo->max_v_samp_factor,
1.124 + compptr->v_samp_factor);
1.125 + }
1.126 +
1.127 + /* Compute dimensions of components */
1.128 + for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
1.129 + ci++, compptr++) {
1.130 + /* Fill in the correct component_index value; don't rely on application */
1.131 + compptr->component_index = ci;
1.132 + /* For compression, we never do DCT scaling. */
1.133 +#if JPEG_LIB_VERSION >= 70
1.134 + compptr->DCT_h_scaled_size = compptr->DCT_v_scaled_size = DCTSIZE;
1.135 +#else
1.136 + compptr->DCT_scaled_size = DCTSIZE;
1.137 +#endif
1.138 + /* Size in DCT blocks */
1.139 + compptr->width_in_blocks = (JDIMENSION)
1.140 + jdiv_round_up((long) cinfo->_jpeg_width * (long) compptr->h_samp_factor,
1.141 + (long) (cinfo->max_h_samp_factor * DCTSIZE));
1.142 + compptr->height_in_blocks = (JDIMENSION)
1.143 + jdiv_round_up((long) cinfo->_jpeg_height * (long) compptr->v_samp_factor,
1.144 + (long) (cinfo->max_v_samp_factor * DCTSIZE));
1.145 + /* Size in samples */
1.146 + compptr->downsampled_width = (JDIMENSION)
1.147 + jdiv_round_up((long) cinfo->_jpeg_width * (long) compptr->h_samp_factor,
1.148 + (long) cinfo->max_h_samp_factor);
1.149 + compptr->downsampled_height = (JDIMENSION)
1.150 + jdiv_round_up((long) cinfo->_jpeg_height * (long) compptr->v_samp_factor,
1.151 + (long) cinfo->max_v_samp_factor);
1.152 + /* Mark component needed (this flag isn't actually used for compression) */
1.153 + compptr->component_needed = TRUE;
1.154 + }
1.155 +
1.156 + /* Compute number of fully interleaved MCU rows (number of times that
1.157 + * main controller will call coefficient controller).
1.158 + */
1.159 + cinfo->total_iMCU_rows = (JDIMENSION)
1.160 + jdiv_round_up((long) cinfo->_jpeg_height,
1.161 + (long) (cinfo->max_v_samp_factor*DCTSIZE));
1.162 +}
1.163 +
1.164 +
1.165 +#ifdef C_MULTISCAN_FILES_SUPPORTED
1.166 +
1.167 +LOCAL(void)
1.168 +validate_script (j_compress_ptr cinfo)
1.169 +/* Verify that the scan script in cinfo->scan_info[] is valid; also
1.170 + * determine whether it uses progressive JPEG, and set cinfo->progressive_mode.
1.171 + */
1.172 +{
1.173 + const jpeg_scan_info * scanptr;
1.174 + int scanno, ncomps, ci, coefi, thisi;
1.175 + int Ss, Se, Ah, Al;
1.176 + boolean component_sent[MAX_COMPONENTS];
1.177 +#ifdef C_PROGRESSIVE_SUPPORTED
1.178 + int * last_bitpos_ptr;
1.179 + int last_bitpos[MAX_COMPONENTS][DCTSIZE2];
1.180 + /* -1 until that coefficient has been seen; then last Al for it */
1.181 +#endif
1.182 +
1.183 + if (cinfo->num_scans <= 0)
1.184 + ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, 0);
1.185 +
1.186 + /* For sequential JPEG, all scans must have Ss=0, Se=DCTSIZE2-1;
1.187 + * for progressive JPEG, no scan can have this.
1.188 + */
1.189 + scanptr = cinfo->scan_info;
1.190 + if (scanptr->Ss != 0 || scanptr->Se != DCTSIZE2-1) {
1.191 +#ifdef C_PROGRESSIVE_SUPPORTED
1.192 + cinfo->progressive_mode = TRUE;
1.193 + last_bitpos_ptr = & last_bitpos[0][0];
1.194 + for (ci = 0; ci < cinfo->num_components; ci++)
1.195 + for (coefi = 0; coefi < DCTSIZE2; coefi++)
1.196 + *last_bitpos_ptr++ = -1;
1.197 +#else
1.198 + ERREXIT(cinfo, JERR_NOT_COMPILED);
1.199 +#endif
1.200 + } else {
1.201 + cinfo->progressive_mode = FALSE;
1.202 + for (ci = 0; ci < cinfo->num_components; ci++)
1.203 + component_sent[ci] = FALSE;
1.204 + }
1.205 +
1.206 + for (scanno = 1; scanno <= cinfo->num_scans; scanptr++, scanno++) {
1.207 + /* Validate component indexes */
1.208 + ncomps = scanptr->comps_in_scan;
1.209 + if (ncomps <= 0 || ncomps > MAX_COMPS_IN_SCAN)
1.210 + ERREXIT2(cinfo, JERR_COMPONENT_COUNT, ncomps, MAX_COMPS_IN_SCAN);
1.211 + for (ci = 0; ci < ncomps; ci++) {
1.212 + thisi = scanptr->component_index[ci];
1.213 + if (thisi < 0 || thisi >= cinfo->num_components)
1.214 + ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
1.215 + /* Components must appear in SOF order within each scan */
1.216 + if (ci > 0 && thisi <= scanptr->component_index[ci-1])
1.217 + ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
1.218 + }
1.219 + /* Validate progression parameters */
1.220 + Ss = scanptr->Ss;
1.221 + Se = scanptr->Se;
1.222 + Ah = scanptr->Ah;
1.223 + Al = scanptr->Al;
1.224 + if (cinfo->progressive_mode) {
1.225 +#ifdef C_PROGRESSIVE_SUPPORTED
1.226 + /* The JPEG spec simply gives the ranges 0..13 for Ah and Al, but that
1.227 + * seems wrong: the upper bound ought to depend on data precision.
1.228 + * Perhaps they really meant 0..N+1 for N-bit precision.
1.229 + * Here we allow 0..10 for 8-bit data; Al larger than 10 results in
1.230 + * out-of-range reconstructed DC values during the first DC scan,
1.231 + * which might cause problems for some decoders.
1.232 + */
1.233 +#if BITS_IN_JSAMPLE == 8
1.234 +#define MAX_AH_AL 10
1.235 +#else
1.236 +#define MAX_AH_AL 13
1.237 +#endif
1.238 + if (Ss < 0 || Ss >= DCTSIZE2 || Se < Ss || Se >= DCTSIZE2 ||
1.239 + Ah < 0 || Ah > MAX_AH_AL || Al < 0 || Al > MAX_AH_AL)
1.240 + ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
1.241 + if (Ss == 0) {
1.242 + if (Se != 0) /* DC and AC together not OK */
1.243 + ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
1.244 + } else {
1.245 + if (ncomps != 1) /* AC scans must be for only one component */
1.246 + ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
1.247 + }
1.248 + for (ci = 0; ci < ncomps; ci++) {
1.249 + last_bitpos_ptr = & last_bitpos[scanptr->component_index[ci]][0];
1.250 + if (Ss != 0 && last_bitpos_ptr[0] < 0) /* AC without prior DC scan */
1.251 + ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
1.252 + for (coefi = Ss; coefi <= Se; coefi++) {
1.253 + if (last_bitpos_ptr[coefi] < 0) {
1.254 + /* first scan of this coefficient */
1.255 + if (Ah != 0)
1.256 + ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
1.257 + } else {
1.258 + /* not first scan */
1.259 + if (Ah != last_bitpos_ptr[coefi] || Al != Ah-1)
1.260 + ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
1.261 + }
1.262 + last_bitpos_ptr[coefi] = Al;
1.263 + }
1.264 + }
1.265 +#endif
1.266 + } else {
1.267 + /* For sequential JPEG, all progression parameters must be these: */
1.268 + if (Ss != 0 || Se != DCTSIZE2-1 || Ah != 0 || Al != 0)
1.269 + ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
1.270 + /* Make sure components are not sent twice */
1.271 + for (ci = 0; ci < ncomps; ci++) {
1.272 + thisi = scanptr->component_index[ci];
1.273 + if (component_sent[thisi])
1.274 + ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
1.275 + component_sent[thisi] = TRUE;
1.276 + }
1.277 + }
1.278 + }
1.279 +
1.280 + /* Now verify that everything got sent. */
1.281 + if (cinfo->progressive_mode) {
1.282 +#ifdef C_PROGRESSIVE_SUPPORTED
1.283 + /* For progressive mode, we only check that at least some DC data
1.284 + * got sent for each component; the spec does not require that all bits
1.285 + * of all coefficients be transmitted. Would it be wiser to enforce
1.286 + * transmission of all coefficient bits??
1.287 + */
1.288 + for (ci = 0; ci < cinfo->num_components; ci++) {
1.289 + if (last_bitpos[ci][0] < 0)
1.290 + ERREXIT(cinfo, JERR_MISSING_DATA);
1.291 + }
1.292 +#endif
1.293 + } else {
1.294 + for (ci = 0; ci < cinfo->num_components; ci++) {
1.295 + if (! component_sent[ci])
1.296 + ERREXIT(cinfo, JERR_MISSING_DATA);
1.297 + }
1.298 + }
1.299 +}
1.300 +
1.301 +#endif /* C_MULTISCAN_FILES_SUPPORTED */
1.302 +
1.303 +
1.304 +LOCAL(void)
1.305 +select_scan_parameters (j_compress_ptr cinfo)
1.306 +/* Set up the scan parameters for the current scan */
1.307 +{
1.308 + int ci;
1.309 +
1.310 +#ifdef C_MULTISCAN_FILES_SUPPORTED
1.311 + if (cinfo->scan_info != NULL) {
1.312 + /* Prepare for current scan --- the script is already validated */
1.313 + my_master_ptr master = (my_master_ptr) cinfo->master;
1.314 + const jpeg_scan_info * scanptr = cinfo->scan_info + master->scan_number;
1.315 +
1.316 + cinfo->comps_in_scan = scanptr->comps_in_scan;
1.317 + for (ci = 0; ci < scanptr->comps_in_scan; ci++) {
1.318 + cinfo->cur_comp_info[ci] =
1.319 + &cinfo->comp_info[scanptr->component_index[ci]];
1.320 + }
1.321 + cinfo->Ss = scanptr->Ss;
1.322 + cinfo->Se = scanptr->Se;
1.323 + cinfo->Ah = scanptr->Ah;
1.324 + cinfo->Al = scanptr->Al;
1.325 + }
1.326 + else
1.327 +#endif
1.328 + {
1.329 + /* Prepare for single sequential-JPEG scan containing all components */
1.330 + if (cinfo->num_components > MAX_COMPS_IN_SCAN)
1.331 + ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
1.332 + MAX_COMPS_IN_SCAN);
1.333 + cinfo->comps_in_scan = cinfo->num_components;
1.334 + for (ci = 0; ci < cinfo->num_components; ci++) {
1.335 + cinfo->cur_comp_info[ci] = &cinfo->comp_info[ci];
1.336 + }
1.337 + cinfo->Ss = 0;
1.338 + cinfo->Se = DCTSIZE2-1;
1.339 + cinfo->Ah = 0;
1.340 + cinfo->Al = 0;
1.341 + }
1.342 +}
1.343 +
1.344 +
1.345 +LOCAL(void)
1.346 +per_scan_setup (j_compress_ptr cinfo)
1.347 +/* Do computations that are needed before processing a JPEG scan */
1.348 +/* cinfo->comps_in_scan and cinfo->cur_comp_info[] are already set */
1.349 +{
1.350 + int ci, mcublks, tmp;
1.351 + jpeg_component_info *compptr;
1.352 +
1.353 + if (cinfo->comps_in_scan == 1) {
1.354 +
1.355 + /* Noninterleaved (single-component) scan */
1.356 + compptr = cinfo->cur_comp_info[0];
1.357 +
1.358 + /* Overall image size in MCUs */
1.359 + cinfo->MCUs_per_row = compptr->width_in_blocks;
1.360 + cinfo->MCU_rows_in_scan = compptr->height_in_blocks;
1.361 +
1.362 + /* For noninterleaved scan, always one block per MCU */
1.363 + compptr->MCU_width = 1;
1.364 + compptr->MCU_height = 1;
1.365 + compptr->MCU_blocks = 1;
1.366 + compptr->MCU_sample_width = DCTSIZE;
1.367 + compptr->last_col_width = 1;
1.368 + /* For noninterleaved scans, it is convenient to define last_row_height
1.369 + * as the number of block rows present in the last iMCU row.
1.370 + */
1.371 + tmp = (int) (compptr->height_in_blocks % compptr->v_samp_factor);
1.372 + if (tmp == 0) tmp = compptr->v_samp_factor;
1.373 + compptr->last_row_height = tmp;
1.374 +
1.375 + /* Prepare array describing MCU composition */
1.376 + cinfo->blocks_in_MCU = 1;
1.377 + cinfo->MCU_membership[0] = 0;
1.378 +
1.379 + } else {
1.380 +
1.381 + /* Interleaved (multi-component) scan */
1.382 + if (cinfo->comps_in_scan <= 0 || cinfo->comps_in_scan > MAX_COMPS_IN_SCAN)
1.383 + ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->comps_in_scan,
1.384 + MAX_COMPS_IN_SCAN);
1.385 +
1.386 + /* Overall image size in MCUs */
1.387 + cinfo->MCUs_per_row = (JDIMENSION)
1.388 + jdiv_round_up((long) cinfo->_jpeg_width,
1.389 + (long) (cinfo->max_h_samp_factor*DCTSIZE));
1.390 + cinfo->MCU_rows_in_scan = (JDIMENSION)
1.391 + jdiv_round_up((long) cinfo->_jpeg_height,
1.392 + (long) (cinfo->max_v_samp_factor*DCTSIZE));
1.393 +
1.394 + cinfo->blocks_in_MCU = 0;
1.395 +
1.396 + for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
1.397 + compptr = cinfo->cur_comp_info[ci];
1.398 + /* Sampling factors give # of blocks of component in each MCU */
1.399 + compptr->MCU_width = compptr->h_samp_factor;
1.400 + compptr->MCU_height = compptr->v_samp_factor;
1.401 + compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height;
1.402 + compptr->MCU_sample_width = compptr->MCU_width * DCTSIZE;
1.403 + /* Figure number of non-dummy blocks in last MCU column & row */
1.404 + tmp = (int) (compptr->width_in_blocks % compptr->MCU_width);
1.405 + if (tmp == 0) tmp = compptr->MCU_width;
1.406 + compptr->last_col_width = tmp;
1.407 + tmp = (int) (compptr->height_in_blocks % compptr->MCU_height);
1.408 + if (tmp == 0) tmp = compptr->MCU_height;
1.409 + compptr->last_row_height = tmp;
1.410 + /* Prepare array describing MCU composition */
1.411 + mcublks = compptr->MCU_blocks;
1.412 + if (cinfo->blocks_in_MCU + mcublks > C_MAX_BLOCKS_IN_MCU)
1.413 + ERREXIT(cinfo, JERR_BAD_MCU_SIZE);
1.414 + while (mcublks-- > 0) {
1.415 + cinfo->MCU_membership[cinfo->blocks_in_MCU++] = ci;
1.416 + }
1.417 + }
1.418 +
1.419 + }
1.420 +
1.421 + /* Convert restart specified in rows to actual MCU count. */
1.422 + /* Note that count must fit in 16 bits, so we provide limiting. */
1.423 + if (cinfo->restart_in_rows > 0) {
1.424 + long nominal = (long) cinfo->restart_in_rows * (long) cinfo->MCUs_per_row;
1.425 + cinfo->restart_interval = (unsigned int) MIN(nominal, 65535L);
1.426 + }
1.427 +}
1.428 +
1.429 +
1.430 +/*
1.431 + * Per-pass setup.
1.432 + * This is called at the beginning of each pass. We determine which modules
1.433 + * will be active during this pass and give them appropriate start_pass calls.
1.434 + * We also set is_last_pass to indicate whether any more passes will be
1.435 + * required.
1.436 + */
1.437 +
1.438 +METHODDEF(void)
1.439 +prepare_for_pass (j_compress_ptr cinfo)
1.440 +{
1.441 + my_master_ptr master = (my_master_ptr) cinfo->master;
1.442 +
1.443 + switch (master->pass_type) {
1.444 + case main_pass:
1.445 + /* Initial pass: will collect input data, and do either Huffman
1.446 + * optimization or data output for the first scan.
1.447 + */
1.448 + select_scan_parameters(cinfo);
1.449 + per_scan_setup(cinfo);
1.450 + if (! cinfo->raw_data_in) {
1.451 + (*cinfo->cconvert->start_pass) (cinfo);
1.452 + (*cinfo->downsample->start_pass) (cinfo);
1.453 + (*cinfo->prep->start_pass) (cinfo, JBUF_PASS_THRU);
1.454 + }
1.455 + (*cinfo->fdct->start_pass) (cinfo);
1.456 + (*cinfo->entropy->start_pass) (cinfo, cinfo->optimize_coding);
1.457 + (*cinfo->coef->start_pass) (cinfo,
1.458 + (master->total_passes > 1 ?
1.459 + JBUF_SAVE_AND_PASS : JBUF_PASS_THRU));
1.460 + (*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU);
1.461 + if (cinfo->optimize_coding) {
1.462 + /* No immediate data output; postpone writing frame/scan headers */
1.463 + master->pub.call_pass_startup = FALSE;
1.464 + } else {
1.465 + /* Will write frame/scan headers at first jpeg_write_scanlines call */
1.466 + master->pub.call_pass_startup = TRUE;
1.467 + }
1.468 + break;
1.469 +#ifdef ENTROPY_OPT_SUPPORTED
1.470 + case huff_opt_pass:
1.471 + /* Do Huffman optimization for a scan after the first one. */
1.472 + select_scan_parameters(cinfo);
1.473 + per_scan_setup(cinfo);
1.474 + if (cinfo->Ss != 0 || cinfo->Ah == 0 || cinfo->arith_code) {
1.475 + (*cinfo->entropy->start_pass) (cinfo, TRUE);
1.476 + (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST);
1.477 + master->pub.call_pass_startup = FALSE;
1.478 + break;
1.479 + }
1.480 + /* Special case: Huffman DC refinement scans need no Huffman table
1.481 + * and therefore we can skip the optimization pass for them.
1.482 + */
1.483 + master->pass_type = output_pass;
1.484 + master->pass_number++;
1.485 + /*FALLTHROUGH*/
1.486 +#endif
1.487 + case output_pass:
1.488 + /* Do a data-output pass. */
1.489 + /* We need not repeat per-scan setup if prior optimization pass did it. */
1.490 + if (! cinfo->optimize_coding) {
1.491 + select_scan_parameters(cinfo);
1.492 + per_scan_setup(cinfo);
1.493 + }
1.494 + (*cinfo->entropy->start_pass) (cinfo, FALSE);
1.495 + (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST);
1.496 + /* We emit frame/scan headers now */
1.497 + if (master->scan_number == 0)
1.498 + (*cinfo->marker->write_frame_header) (cinfo);
1.499 + (*cinfo->marker->write_scan_header) (cinfo);
1.500 + master->pub.call_pass_startup = FALSE;
1.501 + break;
1.502 + default:
1.503 + ERREXIT(cinfo, JERR_NOT_COMPILED);
1.504 + }
1.505 +
1.506 + master->pub.is_last_pass = (master->pass_number == master->total_passes-1);
1.507 +
1.508 + /* Set up progress monitor's pass info if present */
1.509 + if (cinfo->progress != NULL) {
1.510 + cinfo->progress->completed_passes = master->pass_number;
1.511 + cinfo->progress->total_passes = master->total_passes;
1.512 + }
1.513 +}
1.514 +
1.515 +
1.516 +/*
1.517 + * Special start-of-pass hook.
1.518 + * This is called by jpeg_write_scanlines if call_pass_startup is TRUE.
1.519 + * In single-pass processing, we need this hook because we don't want to
1.520 + * write frame/scan headers during jpeg_start_compress; we want to let the
1.521 + * application write COM markers etc. between jpeg_start_compress and the
1.522 + * jpeg_write_scanlines loop.
1.523 + * In multi-pass processing, this routine is not used.
1.524 + */
1.525 +
1.526 +METHODDEF(void)
1.527 +pass_startup (j_compress_ptr cinfo)
1.528 +{
1.529 + cinfo->master->call_pass_startup = FALSE; /* reset flag so call only once */
1.530 +
1.531 + (*cinfo->marker->write_frame_header) (cinfo);
1.532 + (*cinfo->marker->write_scan_header) (cinfo);
1.533 +}
1.534 +
1.535 +
1.536 +/*
1.537 + * Finish up at end of pass.
1.538 + */
1.539 +
1.540 +METHODDEF(void)
1.541 +finish_pass_master (j_compress_ptr cinfo)
1.542 +{
1.543 + my_master_ptr master = (my_master_ptr) cinfo->master;
1.544 +
1.545 + /* The entropy coder always needs an end-of-pass call,
1.546 + * either to analyze statistics or to flush its output buffer.
1.547 + */
1.548 + (*cinfo->entropy->finish_pass) (cinfo);
1.549 +
1.550 + /* Update state for next pass */
1.551 + switch (master->pass_type) {
1.552 + case main_pass:
1.553 + /* next pass is either output of scan 0 (after optimization)
1.554 + * or output of scan 1 (if no optimization).
1.555 + */
1.556 + master->pass_type = output_pass;
1.557 + if (! cinfo->optimize_coding)
1.558 + master->scan_number++;
1.559 + break;
1.560 + case huff_opt_pass:
1.561 + /* next pass is always output of current scan */
1.562 + master->pass_type = output_pass;
1.563 + break;
1.564 + case output_pass:
1.565 + /* next pass is either optimization or output of next scan */
1.566 + if (cinfo->optimize_coding)
1.567 + master->pass_type = huff_opt_pass;
1.568 + master->scan_number++;
1.569 + break;
1.570 + }
1.571 +
1.572 + master->pass_number++;
1.573 +}
1.574 +
1.575 +
1.576 +/*
1.577 + * Initialize master compression control.
1.578 + */
1.579 +
1.580 +GLOBAL(void)
1.581 +jinit_c_master_control (j_compress_ptr cinfo, boolean transcode_only)
1.582 +{
1.583 + my_master_ptr master;
1.584 +
1.585 + master = (my_master_ptr)
1.586 + (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
1.587 + SIZEOF(my_comp_master));
1.588 + cinfo->master = (struct jpeg_comp_master *) master;
1.589 + master->pub.prepare_for_pass = prepare_for_pass;
1.590 + master->pub.pass_startup = pass_startup;
1.591 + master->pub.finish_pass = finish_pass_master;
1.592 + master->pub.is_last_pass = FALSE;
1.593 +
1.594 + /* Validate parameters, determine derived values */
1.595 + initial_setup(cinfo, transcode_only);
1.596 +
1.597 + if (cinfo->scan_info != NULL) {
1.598 +#ifdef C_MULTISCAN_FILES_SUPPORTED
1.599 + validate_script(cinfo);
1.600 +#else
1.601 + ERREXIT(cinfo, JERR_NOT_COMPILED);
1.602 +#endif
1.603 + } else {
1.604 + cinfo->progressive_mode = FALSE;
1.605 + cinfo->num_scans = 1;
1.606 + }
1.607 +
1.608 + if (cinfo->progressive_mode && !cinfo->arith_code) /* TEMPORARY HACK ??? */
1.609 + cinfo->optimize_coding = TRUE; /* assume default tables no good for progressive mode */
1.610 +
1.611 + /* Initialize my private state */
1.612 + if (transcode_only) {
1.613 + /* no main pass in transcoding */
1.614 + if (cinfo->optimize_coding)
1.615 + master->pass_type = huff_opt_pass;
1.616 + else
1.617 + master->pass_type = output_pass;
1.618 + } else {
1.619 + /* for normal compression, first pass is always this type: */
1.620 + master->pass_type = main_pass;
1.621 + }
1.622 + master->scan_number = 0;
1.623 + master->pass_number = 0;
1.624 + if (cinfo->optimize_coding)
1.625 + master->total_passes = cinfo->num_scans * 2;
1.626 + else
1.627 + master->total_passes = cinfo->num_scans;
1.628 +}
