+++ /dev/null
-/*
- * jcmarker.c
- *
- * Copyright (C) 1991-1998, Thomas G. Lane.
- * This file is part of the Independent JPEG Group's software.
- * For conditions of distribution and use, see the accompanying README file.
- *
- * This file contains routines to write JPEG datastream markers.
- */
-
-#define JPEG_INTERNALS
-#include "jinclude.h"
-#include "jpeglib.h"
-
-
-typedef enum { /* JPEG marker codes */
- M_SOF0 = 0xc0,
- M_SOF1 = 0xc1,
- M_SOF2 = 0xc2,
- M_SOF3 = 0xc3,
-
- M_SOF5 = 0xc5,
- M_SOF6 = 0xc6,
- M_SOF7 = 0xc7,
-
- M_JPG = 0xc8,
- M_SOF9 = 0xc9,
- M_SOF10 = 0xca,
- M_SOF11 = 0xcb,
-
- M_SOF13 = 0xcd,
- M_SOF14 = 0xce,
- M_SOF15 = 0xcf,
-
- M_DHT = 0xc4,
-
- M_DAC = 0xcc,
-
- M_RST0 = 0xd0,
- M_RST1 = 0xd1,
- M_RST2 = 0xd2,
- M_RST3 = 0xd3,
- M_RST4 = 0xd4,
- M_RST5 = 0xd5,
- M_RST6 = 0xd6,
- M_RST7 = 0xd7,
-
- M_SOI = 0xd8,
- M_EOI = 0xd9,
- M_SOS = 0xda,
- M_DQT = 0xdb,
- M_DNL = 0xdc,
- M_DRI = 0xdd,
- M_DHP = 0xde,
- M_EXP = 0xdf,
-
- M_APP0 = 0xe0,
- M_APP1 = 0xe1,
- M_APP2 = 0xe2,
- M_APP3 = 0xe3,
- M_APP4 = 0xe4,
- M_APP5 = 0xe5,
- M_APP6 = 0xe6,
- M_APP7 = 0xe7,
- M_APP8 = 0xe8,
- M_APP9 = 0xe9,
- M_APP10 = 0xea,
- M_APP11 = 0xeb,
- M_APP12 = 0xec,
- M_APP13 = 0xed,
- M_APP14 = 0xee,
- M_APP15 = 0xef,
-
- M_JPG0 = 0xf0,
- M_JPG13 = 0xfd,
- M_COM = 0xfe,
-
- M_TEM = 0x01,
-
- M_ERROR = 0x100
-} JPEG_MARKER;
-
-
-/* Private state */
-
-typedef struct {
- struct jpeg_marker_writer pub; /* public fields */
-
- unsigned int last_restart_interval; /* last DRI value emitted; 0 after SOI */
-} my_marker_writer;
-
-typedef my_marker_writer * my_marker_ptr;
-
-
-/*
- * Basic output routines.
- *
- * Note that we do not support suspension while writing a marker.
- * Therefore, an application using suspension must ensure that there is
- * enough buffer space for the initial markers (typ. 600-700 bytes) before
- * calling jpeg_start_compress, and enough space to write the trailing EOI
- * (a few bytes) before calling jpeg_finish_compress. Multipass compression
- * modes are not supported at all with suspension, so those two are the only
- * points where markers will be written.
- */
-
-LOCAL(void)
-emit_byte (j_compress_ptr cinfo, int val)
-/* Emit a byte */
-{
- struct jpeg_destination_mgr * dest = cinfo->dest;
-
- *(dest->next_output_byte)++ = (JOCTET) val;
- if (--dest->free_in_buffer == 0) {
- if (! (*dest->empty_output_buffer) (cinfo))
- ERREXIT(cinfo, JERR_CANT_SUSPEND);
- }
-}
-
-
-LOCAL(void)
-emit_marker (j_compress_ptr cinfo, JPEG_MARKER mark)
-/* Emit a marker code */
-{
- emit_byte(cinfo, 0xFF);
- emit_byte(cinfo, (int) mark);
-}
-
-
-LOCAL(void)
-emit_2bytes (j_compress_ptr cinfo, int value)
-/* Emit a 2-byte integer; these are always MSB first in JPEG files */
-{
- emit_byte(cinfo, (value >> 8) & 0xFF);
- emit_byte(cinfo, value & 0xFF);
-}
-
-
-/*
- * Routines to write specific marker types.
- */
-
-LOCAL(int)
-emit_dqt (j_compress_ptr cinfo, int index)
-/* Emit a DQT marker */
-/* Returns the precision used (0 = 8bits, 1 = 16bits) for baseline checking */
-{
- JQUANT_TBL * qtbl = cinfo->quant_tbl_ptrs[index];
- int prec;
- int i;
-
- if (qtbl == NULL)
- ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, index);
-
- prec = 0;
- for (i = 0; i < DCTSIZE2; i++) {
- if (qtbl->quantval[i] > 255)
- prec = 1;
- }
-
- if (! qtbl->sent_table) {
- emit_marker(cinfo, M_DQT);
-
- emit_2bytes(cinfo, prec ? DCTSIZE2*2 + 1 + 2 : DCTSIZE2 + 1 + 2);
-
- emit_byte(cinfo, index + (prec<<4));
-
- for (i = 0; i < DCTSIZE2; i++) {
- /* The table entries must be emitted in zigzag order. */
- unsigned int qval = qtbl->quantval[jpeg_natural_order[i]];
- if (prec)
- emit_byte(cinfo, (int) (qval >> 8));
- emit_byte(cinfo, (int) (qval & 0xFF));
- }
-
- qtbl->sent_table = TRUE;
- }
-
- return prec;
-}
-
-
-LOCAL(void)
-emit_dht (j_compress_ptr cinfo, int index, boolean is_ac)
-/* Emit a DHT marker */
-{
- JHUFF_TBL * htbl;
- int length, i;
-
- if (is_ac) {
- htbl = cinfo->ac_huff_tbl_ptrs[index];
- index += 0x10; /* output index has AC bit set */
- } else {
- htbl = cinfo->dc_huff_tbl_ptrs[index];
- }
-
- if (htbl == NULL)
- ERREXIT1(cinfo, JERR_NO_HUFF_TABLE, index);
-
- if (! htbl->sent_table) {
- emit_marker(cinfo, M_DHT);
-
- length = 0;
- for (i = 1; i <= 16; i++)
- length += htbl->bits[i];
-
- emit_2bytes(cinfo, length + 2 + 1 + 16);
- emit_byte(cinfo, index);
-
- for (i = 1; i <= 16; i++)
- emit_byte(cinfo, htbl->bits[i]);
-
- for (i = 0; i < length; i++)
- emit_byte(cinfo, htbl->huffval[i]);
-
- htbl->sent_table = TRUE;
- }
-}
-
-
-LOCAL(void)
-emit_dac (j_compress_ptr cinfo)
-/* Emit a DAC marker */
-/* Since the useful info is so small, we want to emit all the tables in */
-/* one DAC marker. Therefore this routine does its own scan of the table. */
-{
-#ifdef C_ARITH_CODING_SUPPORTED
- char dc_in_use[NUM_ARITH_TBLS];
- char ac_in_use[NUM_ARITH_TBLS];
- int length, i;
- jpeg_component_info *compptr;
-
- for (i = 0; i < NUM_ARITH_TBLS; i++)
- dc_in_use[i] = ac_in_use[i] = 0;
-
- for (i = 0; i < cinfo->comps_in_scan; i++) {
- compptr = cinfo->cur_comp_info[i];
- dc_in_use[compptr->dc_tbl_no] = 1;
- ac_in_use[compptr->ac_tbl_no] = 1;
- }
-
- length = 0;
- for (i = 0; i < NUM_ARITH_TBLS; i++)
- length += dc_in_use[i] + ac_in_use[i];
-
- emit_marker(cinfo, M_DAC);
-
- emit_2bytes(cinfo, length*2 + 2);
-
- for (i = 0; i < NUM_ARITH_TBLS; i++) {
- if (dc_in_use[i]) {
- emit_byte(cinfo, i);
- emit_byte(cinfo, cinfo->arith_dc_L[i] + (cinfo->arith_dc_U[i]<<4));
- }
- if (ac_in_use[i]) {
- emit_byte(cinfo, i + 0x10);
- emit_byte(cinfo, cinfo->arith_ac_K[i]);
- }
- }
-#endif /* C_ARITH_CODING_SUPPORTED */
-}
-
-
-LOCAL(void)
-emit_dri (j_compress_ptr cinfo)
-/* Emit a DRI marker */
-{
- emit_marker(cinfo, M_DRI);
-
- emit_2bytes(cinfo, 4); /* fixed length */
-
- emit_2bytes(cinfo, (int) cinfo->restart_interval);
-}
-
-
-LOCAL(void)
-emit_sof (j_compress_ptr cinfo, JPEG_MARKER code)
-/* Emit a SOF marker */
-{
- int ci;
- jpeg_component_info *compptr;
-
- emit_marker(cinfo, code);
-
- emit_2bytes(cinfo, 3 * cinfo->num_components + 2 + 5 + 1); /* length */
-
- /* Make sure image isn't bigger than SOF field can handle */
- if ((long) cinfo->image_height > 65535L ||
- (long) cinfo->image_width > 65535L)
- ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) 65535);
-
- emit_byte(cinfo, cinfo->data_precision);
- emit_2bytes(cinfo, (int) cinfo->image_height);
- emit_2bytes(cinfo, (int) cinfo->image_width);
-
- emit_byte(cinfo, cinfo->num_components);
-
- for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
- ci++, compptr++) {
- emit_byte(cinfo, compptr->component_id);
- emit_byte(cinfo, (compptr->h_samp_factor << 4) + compptr->v_samp_factor);
- emit_byte(cinfo, compptr->quant_tbl_no);
- }
-}
-
-
-LOCAL(void)
-emit_sos (j_compress_ptr cinfo)
-/* Emit a SOS marker */
-{
- int i, td, ta;
- jpeg_component_info *compptr;
-
- emit_marker(cinfo, M_SOS);
-
- emit_2bytes(cinfo, 2 * cinfo->comps_in_scan + 2 + 1 + 3); /* length */
-
- emit_byte(cinfo, cinfo->comps_in_scan);
-
- for (i = 0; i < cinfo->comps_in_scan; i++) {
- compptr = cinfo->cur_comp_info[i];
- emit_byte(cinfo, compptr->component_id);
- td = compptr->dc_tbl_no;
- ta = compptr->ac_tbl_no;
- if (cinfo->progressive_mode) {
- /* Progressive mode: only DC or only AC tables are used in one scan;
- * furthermore, Huffman coding of DC refinement uses no table at all.
- * We emit 0 for unused field(s); this is recommended by the P&M text
- * but does not seem to be specified in the standard.
- */
- if (cinfo->Ss == 0) {
- ta = 0; /* DC scan */
- if (cinfo->Ah != 0 && !cinfo->arith_code)
- td = 0; /* no DC table either */
- } else {
- td = 0; /* AC scan */
- }
- }
- emit_byte(cinfo, (td << 4) + ta);
- }
-
- emit_byte(cinfo, cinfo->Ss);
- emit_byte(cinfo, cinfo->Se);
- emit_byte(cinfo, (cinfo->Ah << 4) + cinfo->Al);
-}
-
-
-LOCAL(void)
-emit_jfif_app0 (j_compress_ptr cinfo)
-/* Emit a JFIF-compliant APP0 marker */
-{
- /*
- * Length of APP0 block (2 bytes)
- * Block ID (4 bytes - ASCII "JFIF")
- * Zero byte (1 byte to terminate the ID string)
- * Version Major, Minor (2 bytes - major first)
- * Units (1 byte - 0x00 = none, 0x01 = inch, 0x02 = cm)
- * Xdpu (2 bytes - dots per unit horizontal)
- * Ydpu (2 bytes - dots per unit vertical)
- * Thumbnail X size (1 byte)
- * Thumbnail Y size (1 byte)
- */
-
- emit_marker(cinfo, M_APP0);
-
- emit_2bytes(cinfo, 2 + 4 + 1 + 2 + 1 + 2 + 2 + 1 + 1); /* length */
-
- emit_byte(cinfo, 0x4A); /* Identifier: ASCII "JFIF" */
- emit_byte(cinfo, 0x46);
- emit_byte(cinfo, 0x49);
- emit_byte(cinfo, 0x46);
- emit_byte(cinfo, 0);
- emit_byte(cinfo, cinfo->JFIF_major_version); /* Version fields */
- emit_byte(cinfo, cinfo->JFIF_minor_version);
- emit_byte(cinfo, cinfo->density_unit); /* Pixel size information */
- emit_2bytes(cinfo, (int) cinfo->X_density);
- emit_2bytes(cinfo, (int) cinfo->Y_density);
- emit_byte(cinfo, 0); /* No thumbnail image */
- emit_byte(cinfo, 0);
-}
-
-
-LOCAL(void)
-emit_adobe_app14 (j_compress_ptr cinfo)
-/* Emit an Adobe APP14 marker */
-{
- /*
- * Length of APP14 block (2 bytes)
- * Block ID (5 bytes - ASCII "Adobe")
- * Version Number (2 bytes - currently 100)
- * Flags0 (2 bytes - currently 0)
- * Flags1 (2 bytes - currently 0)
- * Color transform (1 byte)
- *
- * Although Adobe TN 5116 mentions Version = 101, all the Adobe files
- * now in circulation seem to use Version = 100, so that's what we write.
- *
- * We write the color transform byte as 1 if the JPEG color space is
- * YCbCr, 2 if it's YCCK, 0 otherwise. Adobe's definition has to do with
- * whether the encoder performed a transformation, which is pretty useless.
- */
-
- emit_marker(cinfo, M_APP14);
-
- emit_2bytes(cinfo, 2 + 5 + 2 + 2 + 2 + 1); /* length */
-
- emit_byte(cinfo, 0x41); /* Identifier: ASCII "Adobe" */
- emit_byte(cinfo, 0x64);
- emit_byte(cinfo, 0x6F);
- emit_byte(cinfo, 0x62);
- emit_byte(cinfo, 0x65);
- emit_2bytes(cinfo, 100); /* Version */
- emit_2bytes(cinfo, 0); /* Flags0 */
- emit_2bytes(cinfo, 0); /* Flags1 */
- switch (cinfo->jpeg_color_space) {
- case JCS_YCbCr:
- emit_byte(cinfo, 1); /* Color transform = 1 */
- break;
- case JCS_YCCK:
- emit_byte(cinfo, 2); /* Color transform = 2 */
- break;
- default:
- emit_byte(cinfo, 0); /* Color transform = 0 */
- break;
- }
-}
-
-
-/*
- * These routines allow writing an arbitrary marker with parameters.
- * The only intended use is to emit COM or APPn markers after calling
- * write_file_header and before calling write_frame_header.
- * Other uses are not guaranteed to produce desirable results.
- * Counting the parameter bytes properly is the caller's responsibility.
- */
-
-METHODDEF(void)
-write_marker_header (j_compress_ptr cinfo, int marker, unsigned int datalen)
-/* Emit an arbitrary marker header */
-{
- if (datalen > (unsigned int) 65533) /* safety check */
- ERREXIT(cinfo, JERR_BAD_LENGTH);
-
- emit_marker(cinfo, (JPEG_MARKER) marker);
-
- emit_2bytes(cinfo, (int) (datalen + 2)); /* total length */
-}
-
-METHODDEF(void)
-write_marker_byte (j_compress_ptr cinfo, int val)
-/* Emit one byte of marker parameters following write_marker_header */
-{
- emit_byte(cinfo, val);
-}
-
-
-/*
- * Write datastream header.
- * This consists of an SOI and optional APPn markers.
- * We recommend use of the JFIF marker, but not the Adobe marker,
- * when using YCbCr or grayscale data. The JFIF marker should NOT
- * be used for any other JPEG colorspace. The Adobe marker is helpful
- * to distinguish RGB, CMYK, and YCCK colorspaces.
- * Note that an application can write additional header markers after
- * jpeg_start_compress returns.
- */
-
-METHODDEF(void)
-write_file_header (j_compress_ptr cinfo)
-{
- my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
-
- emit_marker(cinfo, M_SOI); /* first the SOI */
-
- /* SOI is defined to reset restart interval to 0 */
- marker->last_restart_interval = 0;
-
- if (cinfo->write_JFIF_header) /* next an optional JFIF APP0 */
- emit_jfif_app0(cinfo);
- if (cinfo->write_Adobe_marker) /* next an optional Adobe APP14 */
- emit_adobe_app14(cinfo);
-}
-
-
-/*
- * Write frame header.
- * This consists of DQT and SOFn markers.
- * Note that we do not emit the SOF until we have emitted the DQT(s).
- * This avoids compatibility problems with incorrect implementations that
- * try to error-check the quant table numbers as soon as they see the SOF.
- */
-
-METHODDEF(void)
-write_frame_header (j_compress_ptr cinfo)
-{
- int ci, prec;
- boolean is_baseline;
- jpeg_component_info *compptr;
-
- /* Emit DQT for each quantization table.
- * Note that emit_dqt() suppresses any duplicate tables.
- */
- prec = 0;
- for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
- ci++, compptr++) {
- prec += emit_dqt(cinfo, compptr->quant_tbl_no);
- }
- /* now prec is nonzero iff there are any 16-bit quant tables. */
-
- /* Check for a non-baseline specification.
- * Note we assume that Huffman table numbers won't be changed later.
- */
- if (cinfo->arith_code || cinfo->progressive_mode ||
- cinfo->data_precision != 8) {
- is_baseline = FALSE;
- } else {
- is_baseline = TRUE;
- for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
- ci++, compptr++) {
- if (compptr->dc_tbl_no > 1 || compptr->ac_tbl_no > 1)
- is_baseline = FALSE;
- }
- if (prec && is_baseline) {
- is_baseline = FALSE;
- /* If it's baseline except for quantizer size, warn the user */
- TRACEMS(cinfo, 0, JTRC_16BIT_TABLES);
- }
- }
-
- /* Emit the proper SOF marker */
- if (cinfo->arith_code) {
- emit_sof(cinfo, M_SOF9); /* SOF code for arithmetic coding */
- } else {
- if (cinfo->progressive_mode)
- emit_sof(cinfo, M_SOF2); /* SOF code for progressive Huffman */
- else if (is_baseline)
- emit_sof(cinfo, M_SOF0); /* SOF code for baseline implementation */
- else
- emit_sof(cinfo, M_SOF1); /* SOF code for non-baseline Huffman file */
- }
-}
-
-
-/*
- * Write scan header.
- * This consists of DHT or DAC markers, optional DRI, and SOS.
- * Compressed data will be written following the SOS.
- */
-
-METHODDEF(void)
-write_scan_header (j_compress_ptr cinfo)
-{
- my_marker_ptr marker = (my_marker_ptr) cinfo->marker;
- int i;
- jpeg_component_info *compptr;
-
- if (cinfo->arith_code) {
- /* Emit arith conditioning info. We may have some duplication
- * if the file has multiple scans, but it's so small it's hardly
- * worth worrying about.
- */
- emit_dac(cinfo);
- } else {
- /* Emit Huffman tables.
- * Note that emit_dht() suppresses any duplicate tables.
- */
- for (i = 0; i < cinfo->comps_in_scan; i++) {
- compptr = cinfo->cur_comp_info[i];
- if (cinfo->progressive_mode) {
- /* Progressive mode: only DC or only AC tables are used in one scan */
- if (cinfo->Ss == 0) {
- if (cinfo->Ah == 0) /* DC needs no table for refinement scan */
- emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
- } else {
- emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
- }
- } else {
- /* Sequential mode: need both DC and AC tables */
- emit_dht(cinfo, compptr->dc_tbl_no, FALSE);
- emit_dht(cinfo, compptr->ac_tbl_no, TRUE);
- }
- }
- }
-
- /* Emit DRI if required --- note that DRI value could change for each scan.
- * We avoid wasting space with unnecessary DRIs, however.
- */
- if (cinfo->restart_interval != marker->last_restart_interval) {
- emit_dri(cinfo);
- marker->last_restart_interval = cinfo->restart_interval;
- }
-
- emit_sos(cinfo);
-}
-
-
-/*
- * Write datastream trailer.
- */
-
-METHODDEF(void)
-write_file_trailer (j_compress_ptr cinfo)
-{
- emit_marker(cinfo, M_EOI);
-}
-
-
-/*
- * Write an abbreviated table-specification datastream.
- * This consists of SOI, DQT and DHT tables, and EOI.
- * Any table that is defined and not marked sent_table = TRUE will be
- * emitted. Note that all tables will be marked sent_table = TRUE at exit.
- */
-
-METHODDEF(void)
-write_tables_only (j_compress_ptr cinfo)
-{
- int i;
-
- emit_marker(cinfo, M_SOI);
-
- for (i = 0; i < NUM_QUANT_TBLS; i++) {
- if (cinfo->quant_tbl_ptrs[i] != NULL)
- (void) emit_dqt(cinfo, i);
- }
-
- if (! cinfo->arith_code) {
- for (i = 0; i < NUM_HUFF_TBLS; i++) {
- if (cinfo->dc_huff_tbl_ptrs[i] != NULL)
- emit_dht(cinfo, i, FALSE);
- if (cinfo->ac_huff_tbl_ptrs[i] != NULL)
- emit_dht(cinfo, i, TRUE);
- }
- }
-
- emit_marker(cinfo, M_EOI);
-}
-
-
-/*
- * Initialize the marker writer module.
- */
-
-GLOBAL(void)
-jinit_marker_writer (j_compress_ptr cinfo)
-{
- my_marker_ptr marker;
-
- /* Create the subobject */
- marker = (my_marker_ptr)
- (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
- SIZEOF(my_marker_writer));
- cinfo->marker = (struct jpeg_marker_writer *) marker;
- /* Initialize method pointers */
- marker->pub.write_file_header = write_file_header;
- marker->pub.write_frame_header = write_frame_header;
- marker->pub.write_scan_header = write_scan_header;
- marker->pub.write_file_trailer = write_file_trailer;
- marker->pub.write_tables_only = write_tables_only;
- marker->pub.write_marker_header = write_marker_header;
- marker->pub.write_marker_byte = write_marker_byte;
- /* Initialize private state */
- marker->last_restart_interval = 0;
-}
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