diff options
Diffstat (limited to 'plugins/FreeImage/Source/LibJPEG/jcmaster.c')
| -rw-r--r-- | plugins/FreeImage/Source/LibJPEG/jcmaster.c | 1716 |
1 files changed, 858 insertions, 858 deletions
diff --git a/plugins/FreeImage/Source/LibJPEG/jcmaster.c b/plugins/FreeImage/Source/LibJPEG/jcmaster.c index ef73194b8b..caf80a53b3 100644 --- a/plugins/FreeImage/Source/LibJPEG/jcmaster.c +++ b/plugins/FreeImage/Source/LibJPEG/jcmaster.c @@ -1,858 +1,858 @@ -/*
- * jcmaster.c
- *
- * Copyright (C) 1991-1997, Thomas G. Lane.
- * Modified 2003-2011 by Guido Vollbeding.
- * 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.
- */
-
-/*
- * Compute JPEG image dimensions and related values.
- * NOTE: this is exported for possible use by application.
- * Hence it mustn't do anything that can't be done twice.
- */
-
-GLOBAL(void)
-jpeg_calc_jpeg_dimensions (j_compress_ptr cinfo)
-/* Do computations that are needed before master selection phase */
-{
-#ifdef DCT_SCALING_SUPPORTED
-
- /* Sanity check on input image dimensions to prevent overflow in
- * following calculation.
- * We do check jpeg_width and jpeg_height in initial_setup below,
- * but image_width and image_height can come from arbitrary data,
- * and we need some space for multiplication by block_size.
- */
- if (((long) cinfo->image_width >> 24) || ((long) cinfo->image_height >> 24))
- ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION);
-
- /* Compute actual JPEG image dimensions and DCT scaling choices. */
- if (cinfo->scale_num >= cinfo->scale_denom * cinfo->block_size) {
- /* Provide block_size/1 scaling */
- cinfo->jpeg_width = cinfo->image_width * cinfo->block_size;
- cinfo->jpeg_height = cinfo->image_height * cinfo->block_size;
- cinfo->min_DCT_h_scaled_size = 1;
- cinfo->min_DCT_v_scaled_size = 1;
- } else if (cinfo->scale_num * 2 >= cinfo->scale_denom * cinfo->block_size) {
- /* Provide block_size/2 scaling */
- cinfo->jpeg_width = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 2L);
- cinfo->jpeg_height = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 2L);
- cinfo->min_DCT_h_scaled_size = 2;
- cinfo->min_DCT_v_scaled_size = 2;
- } else if (cinfo->scale_num * 3 >= cinfo->scale_denom * cinfo->block_size) {
- /* Provide block_size/3 scaling */
- cinfo->jpeg_width = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 3L);
- cinfo->jpeg_height = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 3L);
- cinfo->min_DCT_h_scaled_size = 3;
- cinfo->min_DCT_v_scaled_size = 3;
- } else if (cinfo->scale_num * 4 >= cinfo->scale_denom * cinfo->block_size) {
- /* Provide block_size/4 scaling */
- cinfo->jpeg_width = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 4L);
- cinfo->jpeg_height = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 4L);
- cinfo->min_DCT_h_scaled_size = 4;
- cinfo->min_DCT_v_scaled_size = 4;
- } else if (cinfo->scale_num * 5 >= cinfo->scale_denom * cinfo->block_size) {
- /* Provide block_size/5 scaling */
- cinfo->jpeg_width = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 5L);
- cinfo->jpeg_height = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 5L);
- cinfo->min_DCT_h_scaled_size = 5;
- cinfo->min_DCT_v_scaled_size = 5;
- } else if (cinfo->scale_num * 6 >= cinfo->scale_denom * cinfo->block_size) {
- /* Provide block_size/6 scaling */
- cinfo->jpeg_width = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 6L);
- cinfo->jpeg_height = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 6L);
- cinfo->min_DCT_h_scaled_size = 6;
- cinfo->min_DCT_v_scaled_size = 6;
- } else if (cinfo->scale_num * 7 >= cinfo->scale_denom * cinfo->block_size) {
- /* Provide block_size/7 scaling */
- cinfo->jpeg_width = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 7L);
- cinfo->jpeg_height = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 7L);
- cinfo->min_DCT_h_scaled_size = 7;
- cinfo->min_DCT_v_scaled_size = 7;
- } else if (cinfo->scale_num * 8 >= cinfo->scale_denom * cinfo->block_size) {
- /* Provide block_size/8 scaling */
- cinfo->jpeg_width = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 8L);
- cinfo->jpeg_height = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 8L);
- cinfo->min_DCT_h_scaled_size = 8;
- cinfo->min_DCT_v_scaled_size = 8;
- } else if (cinfo->scale_num * 9 >= cinfo->scale_denom * cinfo->block_size) {
- /* Provide block_size/9 scaling */
- cinfo->jpeg_width = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 9L);
- cinfo->jpeg_height = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 9L);
- cinfo->min_DCT_h_scaled_size = 9;
- cinfo->min_DCT_v_scaled_size = 9;
- } else if (cinfo->scale_num * 10 >= cinfo->scale_denom * cinfo->block_size) {
- /* Provide block_size/10 scaling */
- cinfo->jpeg_width = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 10L);
- cinfo->jpeg_height = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 10L);
- cinfo->min_DCT_h_scaled_size = 10;
- cinfo->min_DCT_v_scaled_size = 10;
- } else if (cinfo->scale_num * 11 >= cinfo->scale_denom * cinfo->block_size) {
- /* Provide block_size/11 scaling */
- cinfo->jpeg_width = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 11L);
- cinfo->jpeg_height = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 11L);
- cinfo->min_DCT_h_scaled_size = 11;
- cinfo->min_DCT_v_scaled_size = 11;
- } else if (cinfo->scale_num * 12 >= cinfo->scale_denom * cinfo->block_size) {
- /* Provide block_size/12 scaling */
- cinfo->jpeg_width = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 12L);
- cinfo->jpeg_height = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 12L);
- cinfo->min_DCT_h_scaled_size = 12;
- cinfo->min_DCT_v_scaled_size = 12;
- } else if (cinfo->scale_num * 13 >= cinfo->scale_denom * cinfo->block_size) {
- /* Provide block_size/13 scaling */
- cinfo->jpeg_width = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 13L);
- cinfo->jpeg_height = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 13L);
- cinfo->min_DCT_h_scaled_size = 13;
- cinfo->min_DCT_v_scaled_size = 13;
- } else if (cinfo->scale_num * 14 >= cinfo->scale_denom * cinfo->block_size) {
- /* Provide block_size/14 scaling */
- cinfo->jpeg_width = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 14L);
- cinfo->jpeg_height = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 14L);
- cinfo->min_DCT_h_scaled_size = 14;
- cinfo->min_DCT_v_scaled_size = 14;
- } else if (cinfo->scale_num * 15 >= cinfo->scale_denom * cinfo->block_size) {
- /* Provide block_size/15 scaling */
- cinfo->jpeg_width = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 15L);
- cinfo->jpeg_height = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 15L);
- cinfo->min_DCT_h_scaled_size = 15;
- cinfo->min_DCT_v_scaled_size = 15;
- } else {
- /* Provide block_size/16 scaling */
- cinfo->jpeg_width = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 16L);
- cinfo->jpeg_height = (JDIMENSION)
- jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 16L);
- cinfo->min_DCT_h_scaled_size = 16;
- cinfo->min_DCT_v_scaled_size = 16;
- }
-
-#else /* !DCT_SCALING_SUPPORTED */
-
- /* Hardwire it to "no scaling" */
- cinfo->jpeg_width = cinfo->image_width;
- cinfo->jpeg_height = cinfo->image_height;
- cinfo->min_DCT_h_scaled_size = DCTSIZE;
- cinfo->min_DCT_v_scaled_size = DCTSIZE;
-
-#endif /* DCT_SCALING_SUPPORTED */
-}
-
-
-LOCAL(void)
-jpeg_calc_trans_dimensions (j_compress_ptr cinfo)
-{
- if (cinfo->min_DCT_h_scaled_size != cinfo->min_DCT_v_scaled_size)
- ERREXIT2(cinfo, JERR_BAD_DCTSIZE,
- cinfo->min_DCT_h_scaled_size, cinfo->min_DCT_v_scaled_size);
-
- cinfo->block_size = cinfo->min_DCT_h_scaled_size;
-}
-
-
-LOCAL(void)
-initial_setup (j_compress_ptr cinfo, boolean transcode_only)
-/* Do computations that are needed before master selection phase */
-{
- int ci, ssize;
- jpeg_component_info *compptr;
- long samplesperrow;
- JDIMENSION jd_samplesperrow;
-
- if (transcode_only)
- jpeg_calc_trans_dimensions(cinfo);
- else
- jpeg_calc_jpeg_dimensions(cinfo);
-
- /* Sanity check on block_size */
- if (cinfo->block_size < 1 || cinfo->block_size > 16)
- ERREXIT2(cinfo, JERR_BAD_DCTSIZE, cinfo->block_size, cinfo->block_size);
-
- /* Derive natural_order from block_size */
- switch (cinfo->block_size) {
- case 2: cinfo->natural_order = jpeg_natural_order2; break;
- case 3: cinfo->natural_order = jpeg_natural_order3; break;
- case 4: cinfo->natural_order = jpeg_natural_order4; break;
- case 5: cinfo->natural_order = jpeg_natural_order5; break;
- case 6: cinfo->natural_order = jpeg_natural_order6; break;
- case 7: cinfo->natural_order = jpeg_natural_order7; break;
- default: cinfo->natural_order = jpeg_natural_order; break;
- }
-
- /* Derive lim_Se from block_size */
- cinfo->lim_Se = cinfo->block_size < DCTSIZE ?
- cinfo->block_size * cinfo->block_size - 1 : DCTSIZE2-1;
-
- /* Sanity check on image dimensions */
- if (cinfo->jpeg_height <= 0 || cinfo->jpeg_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->jpeg_height > (long) JPEG_MAX_DIMENSION ||
- (long) cinfo->jpeg_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;
- /* In selecting the actual DCT scaling for each component, we try to
- * scale down the chroma components via DCT scaling rather than downsampling.
- * This saves time if the downsampler gets to use 1:1 scaling.
- * Note this code adapts subsampling ratios which are powers of 2.
- */
- ssize = 1;
-#ifdef DCT_SCALING_SUPPORTED
- while (cinfo->min_DCT_h_scaled_size * ssize <=
- (cinfo->do_fancy_downsampling ? DCTSIZE : DCTSIZE / 2) &&
- (cinfo->max_h_samp_factor % (compptr->h_samp_factor * ssize * 2)) == 0) {
- ssize = ssize * 2;
- }
-#endif
- compptr->DCT_h_scaled_size = cinfo->min_DCT_h_scaled_size * ssize;
- ssize = 1;
-#ifdef DCT_SCALING_SUPPORTED
- while (cinfo->min_DCT_v_scaled_size * ssize <=
- (cinfo->do_fancy_downsampling ? DCTSIZE : DCTSIZE / 2) &&
- (cinfo->max_v_samp_factor % (compptr->v_samp_factor * ssize * 2)) == 0) {
- ssize = ssize * 2;
- }
-#endif
- compptr->DCT_v_scaled_size = cinfo->min_DCT_v_scaled_size * ssize;
-
- /* We don't support DCT ratios larger than 2. */
- if (compptr->DCT_h_scaled_size > compptr->DCT_v_scaled_size * 2)
- compptr->DCT_h_scaled_size = compptr->DCT_v_scaled_size * 2;
- else if (compptr->DCT_v_scaled_size > compptr->DCT_h_scaled_size * 2)
- compptr->DCT_v_scaled_size = compptr->DCT_h_scaled_size * 2;
-
- /* Size in DCT blocks */
- compptr->width_in_blocks = (JDIMENSION)
- jdiv_round_up((long) cinfo->jpeg_width * (long) compptr->h_samp_factor,
- (long) (cinfo->max_h_samp_factor * cinfo->block_size));
- compptr->height_in_blocks = (JDIMENSION)
- jdiv_round_up((long) cinfo->jpeg_height * (long) compptr->v_samp_factor,
- (long) (cinfo->max_v_samp_factor * cinfo->block_size));
- /* Size in samples */
- compptr->downsampled_width = (JDIMENSION)
- jdiv_round_up((long) cinfo->jpeg_width *
- (long) (compptr->h_samp_factor * compptr->DCT_h_scaled_size),
- (long) (cinfo->max_h_samp_factor * cinfo->block_size));
- compptr->downsampled_height = (JDIMENSION)
- jdiv_round_up((long) cinfo->jpeg_height *
- (long) (compptr->v_samp_factor * compptr->DCT_v_scaled_size),
- (long) (cinfo->max_v_samp_factor * cinfo->block_size));
- /* 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->jpeg_height,
- (long) (cinfo->max_v_samp_factor * cinfo->block_size));
-}
-
-
-#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);
- }
- }
-}
-
-
-LOCAL(void)
-reduce_script (j_compress_ptr cinfo)
-/* Adapt scan script for use with reduced block size;
- * assume that script has been validated before.
- */
-{
- jpeg_scan_info * scanptr;
- int idxout, idxin;
-
- /* Circumvent const declaration for this function */
- scanptr = (jpeg_scan_info *) cinfo->scan_info;
- idxout = 0;
-
- for (idxin = 0; idxin < cinfo->num_scans; idxin++) {
- /* After skipping, idxout becomes smaller than idxin */
- if (idxin != idxout)
- /* Copy rest of data;
- * note we stay in given chunk of allocated memory.
- */
- scanptr[idxout] = scanptr[idxin];
- if (scanptr[idxout].Ss > cinfo->lim_Se)
- /* Entire scan out of range - skip this entry */
- continue;
- if (scanptr[idxout].Se > cinfo->lim_Se)
- /* Limit scan to end of block */
- scanptr[idxout].Se = cinfo->lim_Se;
- idxout++;
- }
-
- cinfo->num_scans = idxout;
-}
-
-#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]];
- }
- if (cinfo->progressive_mode) {
- cinfo->Ss = scanptr->Ss;
- cinfo->Se = scanptr->Se;
- cinfo->Ah = scanptr->Ah;
- cinfo->Al = scanptr->Al;
- return;
- }
- }
- 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 = cinfo->block_size * cinfo->block_size - 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 = compptr->DCT_h_scaled_size;
- 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->jpeg_width,
- (long) (cinfo->max_h_samp_factor * cinfo->block_size));
- cinfo->MCU_rows_in_scan = (JDIMENSION)
- jdiv_round_up((long) cinfo->jpeg_height,
- (long) (cinfo->max_v_samp_factor * cinfo->block_size));
-
- 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 * compptr->DCT_h_scaled_size;
- /* 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->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, transcode_only);
-
- if (cinfo->scan_info != NULL) {
-#ifdef C_MULTISCAN_FILES_SUPPORTED
- validate_script(cinfo);
- if (cinfo->block_size < DCTSIZE)
- reduce_script(cinfo);
-#else
- ERREXIT(cinfo, JERR_NOT_COMPILED);
-#endif
- } else {
- cinfo->progressive_mode = FALSE;
- cinfo->num_scans = 1;
- }
-
- if ((cinfo->progressive_mode || cinfo->block_size < DCTSIZE) &&
- !cinfo->arith_code) /* TEMPORARY HACK ??? */
- /* assume default tables no good for progressive or downscale mode */
- cinfo->optimize_coding = TRUE;
-
- /* 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;
-}
+/* + * jcmaster.c + * + * Copyright (C) 1991-1997, Thomas G. Lane. + * Modified 2003-2011 by Guido Vollbeding. + * 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. + */ + +/* + * Compute JPEG image dimensions and related values. + * NOTE: this is exported for possible use by application. + * Hence it mustn't do anything that can't be done twice. + */ + +GLOBAL(void) +jpeg_calc_jpeg_dimensions (j_compress_ptr cinfo) +/* Do computations that are needed before master selection phase */ +{ +#ifdef DCT_SCALING_SUPPORTED + + /* Sanity check on input image dimensions to prevent overflow in + * following calculation. + * We do check jpeg_width and jpeg_height in initial_setup below, + * but image_width and image_height can come from arbitrary data, + * and we need some space for multiplication by block_size. + */ + if (((long) cinfo->image_width >> 24) || ((long) cinfo->image_height >> 24)) + ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION); + + /* Compute actual JPEG image dimensions and DCT scaling choices. */ + if (cinfo->scale_num >= cinfo->scale_denom * cinfo->block_size) { + /* Provide block_size/1 scaling */ + cinfo->jpeg_width = cinfo->image_width * cinfo->block_size; + cinfo->jpeg_height = cinfo->image_height * cinfo->block_size; + cinfo->min_DCT_h_scaled_size = 1; + cinfo->min_DCT_v_scaled_size = 1; + } else if (cinfo->scale_num * 2 >= cinfo->scale_denom * cinfo->block_size) { + /* Provide block_size/2 scaling */ + cinfo->jpeg_width = (JDIMENSION) + jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 2L); + cinfo->jpeg_height = (JDIMENSION) + jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 2L); + cinfo->min_DCT_h_scaled_size = 2; + cinfo->min_DCT_v_scaled_size = 2; + } else if (cinfo->scale_num * 3 >= cinfo->scale_denom * cinfo->block_size) { + /* Provide block_size/3 scaling */ + cinfo->jpeg_width = (JDIMENSION) + jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 3L); + cinfo->jpeg_height = (JDIMENSION) + jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 3L); + cinfo->min_DCT_h_scaled_size = 3; + cinfo->min_DCT_v_scaled_size = 3; + } else if (cinfo->scale_num * 4 >= cinfo->scale_denom * cinfo->block_size) { + /* Provide block_size/4 scaling */ + cinfo->jpeg_width = (JDIMENSION) + jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 4L); + cinfo->jpeg_height = (JDIMENSION) + jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 4L); + cinfo->min_DCT_h_scaled_size = 4; + cinfo->min_DCT_v_scaled_size = 4; + } else if (cinfo->scale_num * 5 >= cinfo->scale_denom * cinfo->block_size) { + /* Provide block_size/5 scaling */ + cinfo->jpeg_width = (JDIMENSION) + jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 5L); + cinfo->jpeg_height = (JDIMENSION) + jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 5L); + cinfo->min_DCT_h_scaled_size = 5; + cinfo->min_DCT_v_scaled_size = 5; + } else if (cinfo->scale_num * 6 >= cinfo->scale_denom * cinfo->block_size) { + /* Provide block_size/6 scaling */ + cinfo->jpeg_width = (JDIMENSION) + jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 6L); + cinfo->jpeg_height = (JDIMENSION) + jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 6L); + cinfo->min_DCT_h_scaled_size = 6; + cinfo->min_DCT_v_scaled_size = 6; + } else if (cinfo->scale_num * 7 >= cinfo->scale_denom * cinfo->block_size) { + /* Provide block_size/7 scaling */ + cinfo->jpeg_width = (JDIMENSION) + jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 7L); + cinfo->jpeg_height = (JDIMENSION) + jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 7L); + cinfo->min_DCT_h_scaled_size = 7; + cinfo->min_DCT_v_scaled_size = 7; + } else if (cinfo->scale_num * 8 >= cinfo->scale_denom * cinfo->block_size) { + /* Provide block_size/8 scaling */ + cinfo->jpeg_width = (JDIMENSION) + jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 8L); + cinfo->jpeg_height = (JDIMENSION) + jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 8L); + cinfo->min_DCT_h_scaled_size = 8; + cinfo->min_DCT_v_scaled_size = 8; + } else if (cinfo->scale_num * 9 >= cinfo->scale_denom * cinfo->block_size) { + /* Provide block_size/9 scaling */ + cinfo->jpeg_width = (JDIMENSION) + jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 9L); + cinfo->jpeg_height = (JDIMENSION) + jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 9L); + cinfo->min_DCT_h_scaled_size = 9; + cinfo->min_DCT_v_scaled_size = 9; + } else if (cinfo->scale_num * 10 >= cinfo->scale_denom * cinfo->block_size) { + /* Provide block_size/10 scaling */ + cinfo->jpeg_width = (JDIMENSION) + jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 10L); + cinfo->jpeg_height = (JDIMENSION) + jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 10L); + cinfo->min_DCT_h_scaled_size = 10; + cinfo->min_DCT_v_scaled_size = 10; + } else if (cinfo->scale_num * 11 >= cinfo->scale_denom * cinfo->block_size) { + /* Provide block_size/11 scaling */ + cinfo->jpeg_width = (JDIMENSION) + jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 11L); + cinfo->jpeg_height = (JDIMENSION) + jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 11L); + cinfo->min_DCT_h_scaled_size = 11; + cinfo->min_DCT_v_scaled_size = 11; + } else if (cinfo->scale_num * 12 >= cinfo->scale_denom * cinfo->block_size) { + /* Provide block_size/12 scaling */ + cinfo->jpeg_width = (JDIMENSION) + jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 12L); + cinfo->jpeg_height = (JDIMENSION) + jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 12L); + cinfo->min_DCT_h_scaled_size = 12; + cinfo->min_DCT_v_scaled_size = 12; + } else if (cinfo->scale_num * 13 >= cinfo->scale_denom * cinfo->block_size) { + /* Provide block_size/13 scaling */ + cinfo->jpeg_width = (JDIMENSION) + jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 13L); + cinfo->jpeg_height = (JDIMENSION) + jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 13L); + cinfo->min_DCT_h_scaled_size = 13; + cinfo->min_DCT_v_scaled_size = 13; + } else if (cinfo->scale_num * 14 >= cinfo->scale_denom * cinfo->block_size) { + /* Provide block_size/14 scaling */ + cinfo->jpeg_width = (JDIMENSION) + jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 14L); + cinfo->jpeg_height = (JDIMENSION) + jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 14L); + cinfo->min_DCT_h_scaled_size = 14; + cinfo->min_DCT_v_scaled_size = 14; + } else if (cinfo->scale_num * 15 >= cinfo->scale_denom * cinfo->block_size) { + /* Provide block_size/15 scaling */ + cinfo->jpeg_width = (JDIMENSION) + jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 15L); + cinfo->jpeg_height = (JDIMENSION) + jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 15L); + cinfo->min_DCT_h_scaled_size = 15; + cinfo->min_DCT_v_scaled_size = 15; + } else { + /* Provide block_size/16 scaling */ + cinfo->jpeg_width = (JDIMENSION) + jdiv_round_up((long) cinfo->image_width * cinfo->block_size, 16L); + cinfo->jpeg_height = (JDIMENSION) + jdiv_round_up((long) cinfo->image_height * cinfo->block_size, 16L); + cinfo->min_DCT_h_scaled_size = 16; + cinfo->min_DCT_v_scaled_size = 16; + } + +#else /* !DCT_SCALING_SUPPORTED */ + + /* Hardwire it to "no scaling" */ + cinfo->jpeg_width = cinfo->image_width; + cinfo->jpeg_height = cinfo->image_height; + cinfo->min_DCT_h_scaled_size = DCTSIZE; + cinfo->min_DCT_v_scaled_size = DCTSIZE; + +#endif /* DCT_SCALING_SUPPORTED */ +} + + +LOCAL(void) +jpeg_calc_trans_dimensions (j_compress_ptr cinfo) +{ + if (cinfo->min_DCT_h_scaled_size != cinfo->min_DCT_v_scaled_size) + ERREXIT2(cinfo, JERR_BAD_DCTSIZE, + cinfo->min_DCT_h_scaled_size, cinfo->min_DCT_v_scaled_size); + + cinfo->block_size = cinfo->min_DCT_h_scaled_size; +} + + +LOCAL(void) +initial_setup (j_compress_ptr cinfo, boolean transcode_only) +/* Do computations that are needed before master selection phase */ +{ + int ci, ssize; + jpeg_component_info *compptr; + long samplesperrow; + JDIMENSION jd_samplesperrow; + + if (transcode_only) + jpeg_calc_trans_dimensions(cinfo); + else + jpeg_calc_jpeg_dimensions(cinfo); + + /* Sanity check on block_size */ + if (cinfo->block_size < 1 || cinfo->block_size > 16) + ERREXIT2(cinfo, JERR_BAD_DCTSIZE, cinfo->block_size, cinfo->block_size); + + /* Derive natural_order from block_size */ + switch (cinfo->block_size) { + case 2: cinfo->natural_order = jpeg_natural_order2; break; + case 3: cinfo->natural_order = jpeg_natural_order3; break; + case 4: cinfo->natural_order = jpeg_natural_order4; break; + case 5: cinfo->natural_order = jpeg_natural_order5; break; + case 6: cinfo->natural_order = jpeg_natural_order6; break; + case 7: cinfo->natural_order = jpeg_natural_order7; break; + default: cinfo->natural_order = jpeg_natural_order; break; + } + + /* Derive lim_Se from block_size */ + cinfo->lim_Se = cinfo->block_size < DCTSIZE ? + cinfo->block_size * cinfo->block_size - 1 : DCTSIZE2-1; + + /* Sanity check on image dimensions */ + if (cinfo->jpeg_height <= 0 || cinfo->jpeg_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->jpeg_height > (long) JPEG_MAX_DIMENSION || + (long) cinfo->jpeg_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; + /* In selecting the actual DCT scaling for each component, we try to + * scale down the chroma components via DCT scaling rather than downsampling. + * This saves time if the downsampler gets to use 1:1 scaling. + * Note this code adapts subsampling ratios which are powers of 2. + */ + ssize = 1; +#ifdef DCT_SCALING_SUPPORTED + while (cinfo->min_DCT_h_scaled_size * ssize <= + (cinfo->do_fancy_downsampling ? DCTSIZE : DCTSIZE / 2) && + (cinfo->max_h_samp_factor % (compptr->h_samp_factor * ssize * 2)) == 0) { + ssize = ssize * 2; + } +#endif + compptr->DCT_h_scaled_size = cinfo->min_DCT_h_scaled_size * ssize; + ssize = 1; +#ifdef DCT_SCALING_SUPPORTED + while (cinfo->min_DCT_v_scaled_size * ssize <= + (cinfo->do_fancy_downsampling ? DCTSIZE : DCTSIZE / 2) && + (cinfo->max_v_samp_factor % (compptr->v_samp_factor * ssize * 2)) == 0) { + ssize = ssize * 2; + } +#endif + compptr->DCT_v_scaled_size = cinfo->min_DCT_v_scaled_size * ssize; + + /* We don't support DCT ratios larger than 2. */ + if (compptr->DCT_h_scaled_size > compptr->DCT_v_scaled_size * 2) + compptr->DCT_h_scaled_size = compptr->DCT_v_scaled_size * 2; + else if (compptr->DCT_v_scaled_size > compptr->DCT_h_scaled_size * 2) + compptr->DCT_v_scaled_size = compptr->DCT_h_scaled_size * 2; + + /* Size in DCT blocks */ + compptr->width_in_blocks = (JDIMENSION) + jdiv_round_up((long) cinfo->jpeg_width * (long) compptr->h_samp_factor, + (long) (cinfo->max_h_samp_factor * cinfo->block_size)); + compptr->height_in_blocks = (JDIMENSION) + jdiv_round_up((long) cinfo->jpeg_height * (long) compptr->v_samp_factor, + (long) (cinfo->max_v_samp_factor * cinfo->block_size)); + /* Size in samples */ + compptr->downsampled_width = (JDIMENSION) + jdiv_round_up((long) cinfo->jpeg_width * + (long) (compptr->h_samp_factor * compptr->DCT_h_scaled_size), + (long) (cinfo->max_h_samp_factor * cinfo->block_size)); + compptr->downsampled_height = (JDIMENSION) + jdiv_round_up((long) cinfo->jpeg_height * + (long) (compptr->v_samp_factor * compptr->DCT_v_scaled_size), + (long) (cinfo->max_v_samp_factor * cinfo->block_size)); + /* 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->jpeg_height, + (long) (cinfo->max_v_samp_factor * cinfo->block_size)); +} + + +#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); + } + } +} + + +LOCAL(void) +reduce_script (j_compress_ptr cinfo) +/* Adapt scan script for use with reduced block size; + * assume that script has been validated before. + */ +{ + jpeg_scan_info * scanptr; + int idxout, idxin; + + /* Circumvent const declaration for this function */ + scanptr = (jpeg_scan_info *) cinfo->scan_info; + idxout = 0; + + for (idxin = 0; idxin < cinfo->num_scans; idxin++) { + /* After skipping, idxout becomes smaller than idxin */ + if (idxin != idxout) + /* Copy rest of data; + * note we stay in given chunk of allocated memory. + */ + scanptr[idxout] = scanptr[idxin]; + if (scanptr[idxout].Ss > cinfo->lim_Se) + /* Entire scan out of range - skip this entry */ + continue; + if (scanptr[idxout].Se > cinfo->lim_Se) + /* Limit scan to end of block */ + scanptr[idxout].Se = cinfo->lim_Se; + idxout++; + } + + cinfo->num_scans = idxout; +} + +#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]]; + } + if (cinfo->progressive_mode) { + cinfo->Ss = scanptr->Ss; + cinfo->Se = scanptr->Se; + cinfo->Ah = scanptr->Ah; + cinfo->Al = scanptr->Al; + return; + } + } + 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 = cinfo->block_size * cinfo->block_size - 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 = compptr->DCT_h_scaled_size; + 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->jpeg_width, + (long) (cinfo->max_h_samp_factor * cinfo->block_size)); + cinfo->MCU_rows_in_scan = (JDIMENSION) + jdiv_round_up((long) cinfo->jpeg_height, + (long) (cinfo->max_v_samp_factor * cinfo->block_size)); + + 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 * compptr->DCT_h_scaled_size; + /* 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->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, transcode_only); + + if (cinfo->scan_info != NULL) { +#ifdef C_MULTISCAN_FILES_SUPPORTED + validate_script(cinfo); + if (cinfo->block_size < DCTSIZE) + reduce_script(cinfo); +#else + ERREXIT(cinfo, JERR_NOT_COMPILED); +#endif + } else { + cinfo->progressive_mode = FALSE; + cinfo->num_scans = 1; + } + + if ((cinfo->progressive_mode || cinfo->block_size < DCTSIZE) && + !cinfo->arith_code) /* TEMPORARY HACK ??? */ + /* assume default tables no good for progressive or downscale mode */ + cinfo->optimize_coding = TRUE; + + /* 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; +} |