mirror of
https://github.com/id-Software/DOOM-3-BFG.git
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644 lines
18 KiB
C++
644 lines
18 KiB
C++
/*
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* jcmarker.c
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*
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* Copyright (C) 1991-1995, Thomas G. Lane.
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* This file is part of the Independent JPEG Group's software.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file contains routines to write JPEG datastream markers.
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*/
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#define JPEG_INTERNALS
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#include "jinclude.h"
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#include "jpeglib.h"
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typedef enum { /* JPEG marker codes */
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M_SOF0 = 0xc0,
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M_SOF1 = 0xc1,
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M_SOF2 = 0xc2,
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M_SOF3 = 0xc3,
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M_SOF5 = 0xc5,
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M_SOF6 = 0xc6,
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M_SOF7 = 0xc7,
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M_JPG = 0xc8,
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M_SOF9 = 0xc9,
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M_SOF10 = 0xca,
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M_SOF11 = 0xcb,
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M_SOF13 = 0xcd,
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M_SOF14 = 0xce,
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M_SOF15 = 0xcf,
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M_DHT = 0xc4,
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M_DAC = 0xcc,
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M_RST0 = 0xd0,
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M_RST1 = 0xd1,
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M_RST2 = 0xd2,
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M_RST3 = 0xd3,
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M_RST4 = 0xd4,
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M_RST5 = 0xd5,
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M_RST6 = 0xd6,
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M_RST7 = 0xd7,
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M_SOI = 0xd8,
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M_EOI = 0xd9,
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M_SOS = 0xda,
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M_DQT = 0xdb,
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M_DNL = 0xdc,
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M_DRI = 0xdd,
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M_DHP = 0xde,
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M_EXP = 0xdf,
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M_APP0 = 0xe0,
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M_APP1 = 0xe1,
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M_APP2 = 0xe2,
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M_APP3 = 0xe3,
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M_APP4 = 0xe4,
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M_APP5 = 0xe5,
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M_APP6 = 0xe6,
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M_APP7 = 0xe7,
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M_APP8 = 0xe8,
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M_APP9 = 0xe9,
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M_APP10 = 0xea,
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M_APP11 = 0xeb,
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M_APP12 = 0xec,
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M_APP13 = 0xed,
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M_APP14 = 0xee,
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M_APP15 = 0xef,
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M_JPG0 = 0xf0,
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M_JPG13 = 0xfd,
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M_COM = 0xfe,
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M_TEM = 0x01,
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M_ERROR = 0x100
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} JPEG_MARKER;
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/*
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* Basic output routines.
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*
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* Note that we do not support suspension while writing a marker.
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* Therefore, an application using suspension must ensure that there is
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* enough buffer space for the initial markers (typ. 600-700 bytes) before
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* calling jpeg_start_compress, and enough space to write the trailing EOI
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* (a few bytes) before calling jpeg_finish_compress. Multipass compression
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* modes are not supported at all with suspension, so those two are the only
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* points where markers will be written.
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*/
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LOCAL void
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emit_byte( j_compress_ptr cinfo, int val ) {
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/* Emit a byte */
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struct jpeg_destination_mgr * dest = cinfo->dest;
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*( dest->next_output_byte )++ = (JOCTET) val;
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if ( --dest->free_in_buffer == 0 ) {
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if ( !( *dest->empty_output_buffer )( cinfo ) ) {
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ERREXIT( cinfo, JERR_CANT_SUSPEND );
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}
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}
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}
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LOCAL void
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emit_marker( j_compress_ptr cinfo, JPEG_MARKER mark ) {
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/* Emit a marker code */
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emit_byte( cinfo, 0xFF );
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emit_byte( cinfo, (int) mark );
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}
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LOCAL void
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emit_2bytes( j_compress_ptr cinfo, int value ) {
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/* Emit a 2-byte integer; these are always MSB first in JPEG files */
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emit_byte( cinfo, ( value >> 8 ) & 0xFF );
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emit_byte( cinfo, value & 0xFF );
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}
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/*
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* Routines to write specific marker types.
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*/
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LOCAL int
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emit_dqt( j_compress_ptr cinfo, int index ) {
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/* Emit a DQT marker */
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/* Returns the precision used (0 = 8bits, 1 = 16bits) for baseline checking */
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JQUANT_TBL * qtbl = cinfo->quant_tbl_ptrs[index];
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int prec;
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int i;
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if ( qtbl == NULL ) {
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ERREXIT1( cinfo, JERR_NO_QUANT_TABLE, index );
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}
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prec = 0;
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for ( i = 0; i < DCTSIZE2; i++ ) {
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if ( qtbl->quantval[i] > 255 ) {
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prec = 1;
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}
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}
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if ( !qtbl->sent_table ) {
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emit_marker( cinfo, M_DQT );
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emit_2bytes( cinfo, prec ? DCTSIZE2 * 2 + 1 + 2 : DCTSIZE2 + 1 + 2 );
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emit_byte( cinfo, index + ( prec << 4 ) );
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for ( i = 0; i < DCTSIZE2; i++ ) {
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if ( prec ) {
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emit_byte( cinfo, qtbl->quantval[i] >> 8 );
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}
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emit_byte( cinfo, qtbl->quantval[i] & 0xFF );
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}
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qtbl->sent_table = TRUE;
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}
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return prec;
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}
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LOCAL void
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emit_dht( j_compress_ptr cinfo, int index, boolean is_ac ) {
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/* Emit a DHT marker */
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JHUFF_TBL * htbl;
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int length, i;
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if ( is_ac ) {
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htbl = cinfo->ac_huff_tbl_ptrs[index];
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index += 0x10; /* output index has AC bit set */
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} else {
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htbl = cinfo->dc_huff_tbl_ptrs[index];
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}
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if ( htbl == NULL ) {
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ERREXIT1( cinfo, JERR_NO_HUFF_TABLE, index );
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}
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if ( !htbl->sent_table ) {
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emit_marker( cinfo, M_DHT );
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length = 0;
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for ( i = 1; i <= 16; i++ ) {
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length += htbl->bits[i];
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}
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emit_2bytes( cinfo, length + 2 + 1 + 16 );
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emit_byte( cinfo, index );
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for ( i = 1; i <= 16; i++ ) {
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emit_byte( cinfo, htbl->bits[i] );
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}
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for ( i = 0; i < length; i++ ) {
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emit_byte( cinfo, htbl->huffval[i] );
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}
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htbl->sent_table = TRUE;
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}
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}
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LOCAL void
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emit_dac( j_compress_ptr cinfo ) {
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/* Emit a DAC marker */
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/* Since the useful info is so small, we want to emit all the tables in */
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/* one DAC marker. Therefore this routine does its own scan of the table. */
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#ifdef C_ARITH_CODING_SUPPORTED
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char dc_in_use[NUM_ARITH_TBLS];
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char ac_in_use[NUM_ARITH_TBLS];
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int length, i;
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jpeg_component_info * compptr;
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for ( i = 0; i < NUM_ARITH_TBLS; i++ ) {
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dc_in_use[i] = ac_in_use[i] = 0;
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}
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for ( i = 0; i < cinfo->comps_in_scan; i++ ) {
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compptr = cinfo->cur_comp_info[i];
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dc_in_use[compptr->dc_tbl_no] = 1;
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ac_in_use[compptr->ac_tbl_no] = 1;
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}
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length = 0;
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for ( i = 0; i < NUM_ARITH_TBLS; i++ ) {
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length += dc_in_use[i] + ac_in_use[i];
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}
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emit_marker( cinfo, M_DAC );
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emit_2bytes( cinfo, length * 2 + 2 );
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for ( i = 0; i < NUM_ARITH_TBLS; i++ ) {
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if ( dc_in_use[i] ) {
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emit_byte( cinfo, i );
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emit_byte( cinfo, cinfo->arith_dc_L[i] + ( cinfo->arith_dc_U[i] << 4 ) );
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}
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if ( ac_in_use[i] ) {
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emit_byte( cinfo, i + 0x10 );
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emit_byte( cinfo, cinfo->arith_ac_K[i] );
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}
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}
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#endif /* C_ARITH_CODING_SUPPORTED */
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}
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LOCAL void
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emit_dri( j_compress_ptr cinfo ) {
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/* Emit a DRI marker */
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emit_marker( cinfo, M_DRI );
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emit_2bytes( cinfo, 4 );/* fixed length */
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emit_2bytes( cinfo, (int) cinfo->restart_interval );
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}
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LOCAL void
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emit_sof( j_compress_ptr cinfo, JPEG_MARKER code ) {
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/* Emit a SOF marker */
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int ci;
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jpeg_component_info * compptr;
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emit_marker( cinfo, code );
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emit_2bytes( cinfo, 3 * cinfo->num_components + 2 + 5 + 1 );/* length */
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/* Make sure image isn't bigger than SOF field can handle */
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if ( ( (long) cinfo->image_height > 65535L ) ||
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( (long) cinfo->image_width > 65535L ) ) {
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ERREXIT1( cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) 65535 );
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}
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emit_byte( cinfo, cinfo->data_precision );
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emit_2bytes( cinfo, (int) cinfo->image_height );
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emit_2bytes( cinfo, (int) cinfo->image_width );
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emit_byte( cinfo, cinfo->num_components );
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for ( ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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ci++, compptr++ ) {
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emit_byte( cinfo, compptr->component_id );
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emit_byte( cinfo, ( compptr->h_samp_factor << 4 ) + compptr->v_samp_factor );
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emit_byte( cinfo, compptr->quant_tbl_no );
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}
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}
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LOCAL void
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emit_sos( j_compress_ptr cinfo ) {
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/* Emit a SOS marker */
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int i, td, ta;
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jpeg_component_info * compptr;
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emit_marker( cinfo, M_SOS );
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emit_2bytes( cinfo, 2 * cinfo->comps_in_scan + 2 + 1 + 3 );/* length */
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emit_byte( cinfo, cinfo->comps_in_scan );
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for ( i = 0; i < cinfo->comps_in_scan; i++ ) {
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compptr = cinfo->cur_comp_info[i];
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emit_byte( cinfo, compptr->component_id );
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td = compptr->dc_tbl_no;
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ta = compptr->ac_tbl_no;
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if ( cinfo->progressive_mode ) {
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/* Progressive mode: only DC or only AC tables are used in one scan;
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* furthermore, Huffman coding of DC refinement uses no table at all.
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* We emit 0 for unused field(s); this is recommended by the P&M text
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* but does not seem to be specified in the standard.
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*/
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if ( cinfo->Ss == 0 ) {
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ta = 0;/* DC scan */
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if ( ( cinfo->Ah != 0 ) && ( !cinfo->arith_code ) ) {
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td = 0;
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} /* no DC table either */
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} else {
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td = 0;/* AC scan */
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}
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}
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emit_byte( cinfo, ( td << 4 ) + ta );
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}
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emit_byte( cinfo, cinfo->Ss );
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emit_byte( cinfo, cinfo->Se );
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emit_byte( cinfo, ( cinfo->Ah << 4 ) + cinfo->Al );
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}
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LOCAL void
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emit_jfif_app0( j_compress_ptr cinfo ) {
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/* Emit a JFIF-compliant APP0 marker */
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/*
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* Length of APP0 block (2 bytes)
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* Block ID (4 bytes - ASCII "JFIF")
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* Zero byte (1 byte to terminate the ID string)
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* Version Major, Minor (2 bytes - 0x01, 0x01)
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* Units (1 byte - 0x00 = none, 0x01 = inch, 0x02 = cm)
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* Xdpu (2 bytes - dots per unit horizontal)
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* Ydpu (2 bytes - dots per unit vertical)
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* Thumbnail X size (1 byte)
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* Thumbnail Y size (1 byte)
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*/
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emit_marker( cinfo, M_APP0 );
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emit_2bytes( cinfo, 2 + 4 + 1 + 2 + 1 + 2 + 2 + 1 + 1 );/* length */
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emit_byte( cinfo, 0x4A );/* Identifier: ASCII "JFIF" */
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emit_byte( cinfo, 0x46 );
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emit_byte( cinfo, 0x49 );
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emit_byte( cinfo, 0x46 );
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emit_byte( cinfo, 0 );
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/* We currently emit version code 1.01 since we use no 1.02 features.
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* This may avoid complaints from some older decoders.
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*/
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emit_byte( cinfo, 1 ); /* Major version */
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emit_byte( cinfo, 1 ); /* Minor version */
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emit_byte( cinfo, cinfo->density_unit );/* Pixel size information */
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emit_2bytes( cinfo, (int) cinfo->X_density );
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emit_2bytes( cinfo, (int) cinfo->Y_density );
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emit_byte( cinfo, 0 ); /* No thumbnail image */
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emit_byte( cinfo, 0 );
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}
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LOCAL void
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emit_adobe_app14( j_compress_ptr cinfo ) {
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/* Emit an Adobe APP14 marker */
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/*
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* Length of APP14 block (2 bytes)
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* Block ID (5 bytes - ASCII "Adobe")
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* Version Number (2 bytes - currently 100)
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* Flags0 (2 bytes - currently 0)
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* Flags1 (2 bytes - currently 0)
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* Color transform (1 byte)
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*
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* Although Adobe TN 5116 mentions Version = 101, all the Adobe files
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* now in circulation seem to use Version = 100, so that's what we write.
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*
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* We write the color transform byte as 1 if the JPEG color space is
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* YCbCr, 2 if it's YCCK, 0 otherwise. Adobe's definition has to do with
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* whether the encoder performed a transformation, which is pretty useless.
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*/
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emit_marker( cinfo, M_APP14 );
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emit_2bytes( cinfo, 2 + 5 + 2 + 2 + 2 + 1 );/* length */
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emit_byte( cinfo, 0x41 );/* Identifier: ASCII "Adobe" */
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emit_byte( cinfo, 0x64 );
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emit_byte( cinfo, 0x6F );
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emit_byte( cinfo, 0x62 );
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emit_byte( cinfo, 0x65 );
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emit_2bytes( cinfo, 100 );/* Version */
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emit_2bytes( cinfo, 0 );/* Flags0 */
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emit_2bytes( cinfo, 0 );/* Flags1 */
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switch ( cinfo->jpeg_color_space ) {
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case JCS_YCbCr:
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emit_byte( cinfo, 1 );/* Color transform = 1 */
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break;
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case JCS_YCCK:
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emit_byte( cinfo, 2 );/* Color transform = 2 */
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break;
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default:
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emit_byte( cinfo, 0 );/* Color transform = 0 */
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break;
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}
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}
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/*
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* This routine is exported for possible use by applications.
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* The intended use is to emit COM or APPn markers after calling
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* jpeg_start_compress() and before the first jpeg_write_scanlines() call
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* (hence, after write_file_header but before write_frame_header).
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* Other uses are not guaranteed to produce desirable results.
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*/
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METHODDEF void
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write_any_marker( j_compress_ptr cinfo, int marker,
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const JOCTET * dataptr, unsigned int datalen ) {
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/* Emit an arbitrary marker with parameters */
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if ( datalen <= (unsigned int) 65533 ) {/* safety check */
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emit_marker( cinfo, (JPEG_MARKER) marker );
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emit_2bytes( cinfo, (int) ( datalen + 2 ) );/* total length */
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while ( datalen-- ) {
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emit_byte( cinfo, *dataptr );
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dataptr++;
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}
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}
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}
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/*
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* Write datastream header.
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* This consists of an SOI and optional APPn markers.
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* We recommend use of the JFIF marker, but not the Adobe marker,
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* when using YCbCr or grayscale data. The JFIF marker should NOT
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* be used for any other JPEG colorspace. The Adobe marker is helpful
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* to distinguish RGB, CMYK, and YCCK colorspaces.
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* Note that an application can write additional header markers after
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* jpeg_start_compress returns.
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*/
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METHODDEF void
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write_file_header( j_compress_ptr cinfo ) {
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emit_marker( cinfo, M_SOI );/* first the SOI */
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if ( cinfo->write_JFIF_header ) {/* next an optional JFIF APP0 */
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emit_jfif_app0( cinfo );
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}
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if ( cinfo->write_Adobe_marker ) {/* next an optional Adobe APP14 */
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emit_adobe_app14( cinfo );
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}
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}
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/*
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* Write frame header.
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* This consists of DQT and SOFn markers.
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* Note that we do not emit the SOF until we have emitted the DQT(s).
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* This avoids compatibility problems with incorrect implementations that
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* try to error-check the quant table numbers as soon as they see the SOF.
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*/
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METHODDEF void
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write_frame_header( j_compress_ptr cinfo ) {
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int ci, prec;
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boolean is_baseline;
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jpeg_component_info * compptr;
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/* Emit DQT for each quantization table.
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* Note that emit_dqt() suppresses any duplicate tables.
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*/
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prec = 0;
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for ( ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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ci++, compptr++ ) {
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prec += emit_dqt( cinfo, compptr->quant_tbl_no );
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}
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/* now prec is nonzero iff there are any 16-bit quant tables. */
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/* Check for a non-baseline specification.
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* Note we assume that Huffman table numbers won't be changed later.
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*/
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if ( ( cinfo->arith_code ) || ( cinfo->progressive_mode ) ||
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( cinfo->data_precision != 8 ) ) {
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is_baseline = FALSE;
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} else {
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is_baseline = TRUE;
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for ( ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
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ci++, compptr++ ) {
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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 ) {
|
|
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.
|
|
* If it doesn't, a tiny amount of space is wasted in multiple-scan files.
|
|
* We assume DRI will never be nonzero for one scan and zero for a later one.
|
|
*/
|
|
if ( cinfo->restart_interval ) {
|
|
emit_dri( cinfo );
|
|
}
|
|
|
|
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 ) {
|
|
/* Create the subobject */
|
|
cinfo->marker = (struct jpeg_marker_writer *)
|
|
( * cinfo->mem->alloc_small )( (j_common_ptr) cinfo, JPOOL_IMAGE,
|
|
SIZEOF( struct jpeg_marker_writer ) );
|
|
/* Initialize method pointers */
|
|
cinfo->marker->write_any_marker = write_any_marker;
|
|
cinfo->marker->write_file_header = write_file_header;
|
|
cinfo->marker->write_frame_header = write_frame_header;
|
|
cinfo->marker->write_scan_header = write_scan_header;
|
|
cinfo->marker->write_file_trailer = write_file_trailer;
|
|
cinfo->marker->write_tables_only = write_tables_only;
|
|
}
|