| /* |
| * jcmaster.c |
| * |
| * This file was part of the Independent JPEG Group's software: |
| * Copyright (C) 1991-1997, Thomas G. Lane. |
| * Modified 2003-2010 by Guido Vollbeding. |
| * Lossless JPEG Modifications: |
| * Copyright (C) 1999, Ken Murchison. |
| * libjpeg-turbo Modifications: |
| * Copyright (C) 2010, 2016, 2018, 2022-2024, D. R. Commander. |
| * For conditions of distribution and use, see the accompanying README.ijg |
| * 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" |
| #include "jpegapicomp.h" |
| #include "jcmaster.h" |
| |
| |
| /* |
| * Support routines that do various essential calculations. |
| */ |
| |
| #if JPEG_LIB_VERSION >= 70 |
| /* |
| * 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 */ |
| { |
| int data_unit = cinfo->master->lossless ? 1 : DCTSIZE; |
| |
| /* Hardwire it to "no scaling" */ |
| cinfo->jpeg_width = cinfo->image_width; |
| cinfo->jpeg_height = cinfo->image_height; |
| cinfo->min_DCT_h_scaled_size = data_unit; |
| cinfo->min_DCT_v_scaled_size = data_unit; |
| } |
| #endif |
| |
| |
| LOCAL(boolean) |
| using_std_huff_tables(j_compress_ptr cinfo) |
| { |
| int i; |
| |
| static const UINT8 bits_dc_luminance[17] = { |
| /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 |
| }; |
| static const UINT8 val_dc_luminance[] = { |
| 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 |
| }; |
| |
| static const UINT8 bits_dc_chrominance[17] = { |
| /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 |
| }; |
| static const UINT8 val_dc_chrominance[] = { |
| 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 |
| }; |
| |
| static const UINT8 bits_ac_luminance[17] = { |
| /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d |
| }; |
| static const UINT8 val_ac_luminance[] = { |
| 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, |
| 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, |
| 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, |
| 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, |
| 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16, |
| 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28, |
| 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, |
| 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, |
| 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, |
| 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, |
| 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, |
| 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, |
| 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, |
| 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, |
| 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, |
| 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, |
| 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, |
| 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, |
| 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, |
| 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, |
| 0xf9, 0xfa |
| }; |
| |
| static const UINT8 bits_ac_chrominance[17] = { |
| /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 |
| }; |
| static const UINT8 val_ac_chrominance[] = { |
| 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, |
| 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, |
| 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, |
| 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, |
| 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, |
| 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, |
| 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, |
| 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, |
| 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, |
| 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, |
| 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, |
| 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, |
| 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, |
| 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, |
| 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, |
| 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, |
| 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, |
| 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, |
| 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, |
| 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, |
| 0xf9, 0xfa |
| }; |
| |
| if (cinfo->dc_huff_tbl_ptrs[0] == NULL || |
| cinfo->ac_huff_tbl_ptrs[0] == NULL || |
| cinfo->dc_huff_tbl_ptrs[1] == NULL || |
| cinfo->ac_huff_tbl_ptrs[1] == NULL) |
| return FALSE; |
| |
| for (i = 2; i < NUM_HUFF_TBLS; i++) { |
| if (cinfo->dc_huff_tbl_ptrs[i] != NULL || |
| cinfo->ac_huff_tbl_ptrs[i] != NULL) |
| return FALSE; |
| } |
| |
| if (memcmp(cinfo->dc_huff_tbl_ptrs[0]->bits, bits_dc_luminance, |
| sizeof(bits_dc_luminance)) || |
| memcmp(cinfo->dc_huff_tbl_ptrs[0]->huffval, val_dc_luminance, |
| sizeof(val_dc_luminance)) || |
| memcmp(cinfo->ac_huff_tbl_ptrs[0]->bits, bits_ac_luminance, |
| sizeof(bits_ac_luminance)) || |
| memcmp(cinfo->ac_huff_tbl_ptrs[0]->huffval, val_ac_luminance, |
| sizeof(val_ac_luminance)) || |
| memcmp(cinfo->dc_huff_tbl_ptrs[1]->bits, bits_dc_chrominance, |
| sizeof(bits_dc_chrominance)) || |
| memcmp(cinfo->dc_huff_tbl_ptrs[1]->huffval, val_dc_chrominance, |
| sizeof(val_dc_chrominance)) || |
| memcmp(cinfo->ac_huff_tbl_ptrs[1]->bits, bits_ac_chrominance, |
| sizeof(bits_ac_chrominance)) || |
| memcmp(cinfo->ac_huff_tbl_ptrs[1]->huffval, val_ac_chrominance, |
| sizeof(val_ac_chrominance))) |
| return FALSE; |
| |
| return TRUE; |
| } |
| |
| |
| LOCAL(void) |
| initial_setup(j_compress_ptr cinfo, boolean transcode_only) |
| /* Do computations that are needed before master selection phase */ |
| { |
| int ci; |
| jpeg_component_info *compptr; |
| long samplesperrow; |
| JDIMENSION jd_samplesperrow; |
| int data_unit = cinfo->master->lossless ? 1 : DCTSIZE; |
| |
| #if JPEG_LIB_VERSION >= 70 |
| #if JPEG_LIB_VERSION >= 80 |
| if (!transcode_only) |
| #endif |
| jpeg_calc_jpeg_dimensions(cinfo); |
| #endif |
| |
| /* 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); |
| |
| #ifdef C_LOSSLESS_SUPPORTED |
| if (cinfo->data_precision != 8 && cinfo->data_precision != 12 && |
| cinfo->data_precision != 16) |
| #else |
| if (cinfo->data_precision != 8 && cinfo->data_precision != 12) |
| #endif |
| 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. */ |
| #if JPEG_LIB_VERSION >= 70 |
| compptr->DCT_h_scaled_size = compptr->DCT_v_scaled_size = data_unit; |
| #else |
| compptr->DCT_scaled_size = data_unit; |
| #endif |
| /* Size in data units */ |
| compptr->width_in_blocks = (JDIMENSION) |
| jdiv_round_up((long)cinfo->_jpeg_width * (long)compptr->h_samp_factor, |
| (long)(cinfo->max_h_samp_factor * data_unit)); |
| compptr->height_in_blocks = (JDIMENSION) |
| jdiv_round_up((long)cinfo->_jpeg_height * (long)compptr->v_samp_factor, |
| (long)(cinfo->max_v_samp_factor * data_unit)); |
| /* Size in samples */ |
| compptr->downsampled_width = (JDIMENSION) |
| jdiv_round_up((long)cinfo->_jpeg_width * (long)compptr->h_samp_factor, |
| (long)cinfo->max_h_samp_factor); |
| compptr->downsampled_height = (JDIMENSION) |
| jdiv_round_up((long)cinfo->_jpeg_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 or difference controller). |
| */ |
| cinfo->total_iMCU_rows = (JDIMENSION) |
| jdiv_round_up((long)cinfo->_jpeg_height, |
| (long)(cinfo->max_v_samp_factor * data_unit)); |
| } |
| |
| |
| #if defined(C_MULTISCAN_FILES_SUPPORTED) || defined(C_LOSSLESS_SUPPORTED) |
| #define NEED_SCAN_SCRIPT |
| #endif |
| |
| #ifdef NEED_SCAN_SCRIPT |
| |
| 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); |
| |
| #ifndef C_MULTISCAN_FILES_SUPPORTED |
| if (cinfo->num_scans > 1) |
| ERREXIT(cinfo, JERR_NOT_COMPILED); |
| #endif |
| |
| scanptr = cinfo->scan_info; |
| if (scanptr->Ss != 0 && scanptr->Se == 0) { |
| #ifdef C_LOSSLESS_SUPPORTED |
| cinfo->master->lossless = TRUE; |
| cinfo->progressive_mode = FALSE; |
| for (ci = 0; ci < cinfo->num_components; ci++) |
| component_sent[ci] = FALSE; |
| #else |
| ERREXIT(cinfo, JERR_NOT_COMPILED); |
| #endif |
| } |
| /* For sequential JPEG, all scans must have Ss=0, Se=DCTSIZE2-1; |
| * for progressive JPEG, no scan can have this. |
| */ |
| else if (scanptr->Ss != 0 || scanptr->Se != DCTSIZE2 - 1) { |
| #ifdef C_PROGRESSIVE_SUPPORTED |
| cinfo->progressive_mode = TRUE; |
| cinfo->master->lossless = FALSE; |
| 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 = cinfo->master->lossless = 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 |
| /* Rec. ITU-T T.81 | ISO/IEC 10918-1 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. |
| */ |
| int max_Ah_Al = cinfo->data_precision == 12 ? 13 : 10; |
| |
| 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 { |
| #ifdef C_LOSSLESS_SUPPORTED |
| if (cinfo->master->lossless) { |
| /* The JPEG spec simply gives the range 0..15 for Al (Pt), but that |
| * seems wrong: the upper bound ought to depend on data precision. |
| * Perhaps they really meant 0..N-1 for N-bit precision, which is what |
| * we allow here. Values greater than or equal to the data precision |
| * will result in a blank image. |
| */ |
| if (Ss < 1 || Ss > 7 || /* predictor selection value */ |
| Se != 0 || Ah != 0 || |
| Al < 0 || Al >= cinfo->data_precision) /* point transform */ |
| ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); |
| } else |
| #endif |
| { |
| /* 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 /* NEED_SCAN_SCRIPT */ |
| |
| |
| LOCAL(void) |
| select_scan_parameters(j_compress_ptr cinfo) |
| /* Set up the scan parameters for the current scan */ |
| { |
| int ci; |
| |
| #ifdef NEED_SCAN_SCRIPT |
| 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]; |
| } |
| if (!cinfo->master->lossless) { |
| 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; |
| int data_unit = cinfo->master->lossless ? 1 : DCTSIZE; |
| |
| 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 = data_unit; |
| 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 * data_unit)); |
| cinfo->MCU_rows_in_scan = (JDIMENSION) |
| jdiv_round_up((long)cinfo->_jpeg_height, |
| (long)(cinfo->max_v_samp_factor * data_unit)); |
| |
| 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 * data_unit; |
| /* 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->master->lossless) { |
| (*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++; |
| #endif |
| FALLTHROUGH /*FALLTHROUGH*/ |
| 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 = (my_master_ptr)cinfo->master; |
| boolean empty_huff_tables = TRUE; |
| int i; |
| |
| 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; |
| |
| if (cinfo->scan_info != NULL) { |
| #ifdef NEED_SCAN_SCRIPT |
| validate_script(cinfo); |
| #else |
| ERREXIT(cinfo, JERR_NOT_COMPILED); |
| #endif |
| } else { |
| cinfo->progressive_mode = FALSE; |
| cinfo->num_scans = 1; |
| } |
| |
| /* Disable smoothing and subsampling in lossless mode, since those are lossy |
| * algorithms. Set the JPEG colorspace to the input colorspace. Disable raw |
| * (downsampled) data input, because it isn't particularly useful without |
| * subsampling and has not been tested in lossless mode. |
| */ |
| if (cinfo->master->lossless) { |
| int ci; |
| jpeg_component_info *compptr; |
| |
| cinfo->raw_data_in = FALSE; |
| cinfo->smoothing_factor = 0; |
| jpeg_default_colorspace(cinfo); |
| for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
| ci++, compptr++) |
| compptr->h_samp_factor = compptr->v_samp_factor = 1; |
| } |
| |
| /* Validate parameters, determine derived values */ |
| initial_setup(cinfo, transcode_only); |
| |
| if (cinfo->arith_code) |
| cinfo->optimize_coding = FALSE; |
| else { |
| if (cinfo->master->lossless || /* TEMPORARY HACK ??? */ |
| cinfo->progressive_mode) |
| cinfo->optimize_coding = TRUE; /* assume default tables no good for |
| progressive mode or lossless mode */ |
| for (i = 0; i < NUM_HUFF_TBLS; i++) { |
| if (cinfo->dc_huff_tbl_ptrs[i] != NULL || |
| cinfo->ac_huff_tbl_ptrs[i] != NULL) { |
| empty_huff_tables = FALSE; |
| break; |
| } |
| } |
| if (cinfo->data_precision == 12 && !cinfo->optimize_coding && |
| (empty_huff_tables || using_std_huff_tables(cinfo))) |
| cinfo->optimize_coding = TRUE; /* assume default tables no good for |
| 12-bit data precision */ |
| } |
| |
| /* 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; |
| |
| master->jpeg_version = PACKAGE_NAME " version " VERSION " (build " BUILD ")"; |
| } |