mirror of
https://github.com/id-Software/DOOM-3-BFG.git
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374 lines
14 KiB
C++
374 lines
14 KiB
C++
/*
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* jctrans.c
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*
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* Copyright (C) 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 library routines for transcoding compression,
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* that is, writing raw DCT coefficient arrays to an output JPEG file.
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* The routines in jcapimin.c will also be needed by a transcoder.
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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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/* Forward declarations */
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LOCAL void transencode_master_selection
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JPP( ( j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays ) );
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LOCAL void transencode_coef_controller
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JPP( ( j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays ) );
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/*
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* Compression initialization for writing raw-coefficient data.
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* Before calling this, all parameters and a data destination must be set up.
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* Call jpeg_finish_compress() to actually write the data.
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*
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* The number of passed virtual arrays must match cinfo->num_components.
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* Note that the virtual arrays need not be filled or even realized at
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* the time write_coefficients is called; indeed, if the virtual arrays
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* were requested from this compression object's memory manager, they
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* typically will be realized during this routine and filled afterwards.
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*/
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GLOBAL void
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jpeg_write_coefficients( j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays ) {
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if ( cinfo->global_state != CSTATE_START ) {
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ERREXIT1( cinfo, JERR_BAD_STATE, cinfo->global_state );
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}
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/* Mark all tables to be written */
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jpeg_suppress_tables( cinfo, FALSE );
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/* (Re)initialize error mgr and destination modules */
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( *cinfo->err->reset_error_mgr )( (j_common_ptr) cinfo );
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( *cinfo->dest->init_destination )( cinfo );
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/* Perform master selection of active modules */
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transencode_master_selection( cinfo, coef_arrays );
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/* Wait for jpeg_finish_compress() call */
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cinfo->next_scanline = 0;/* so jpeg_write_marker works */
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cinfo->global_state = CSTATE_WRCOEFS;
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}
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/*
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* Initialize the compression object with default parameters,
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* then copy from the source object all parameters needed for lossless
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* transcoding. Parameters that can be varied without loss (such as
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* scan script and Huffman optimization) are left in their default states.
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*/
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GLOBAL void
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jpeg_copy_critical_parameters( j_decompress_ptr srcinfo,
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j_compress_ptr dstinfo ) {
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JQUANT_TBL ** qtblptr;
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jpeg_component_info * incomp, * outcomp;
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JQUANT_TBL * c_quant, * slot_quant;
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int tblno, ci, coefi;
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/* Safety check to ensure start_compress not called yet. */
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if ( dstinfo->global_state != CSTATE_START ) {
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ERREXIT1( dstinfo, JERR_BAD_STATE, dstinfo->global_state );
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}
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/* Copy fundamental image dimensions */
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dstinfo->image_width = srcinfo->image_width;
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dstinfo->image_height = srcinfo->image_height;
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dstinfo->input_components = srcinfo->num_components;
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dstinfo->in_color_space = srcinfo->jpeg_color_space;
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/* Initialize all parameters to default values */
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jpeg_set_defaults( dstinfo );
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/* jpeg_set_defaults may choose wrong colorspace, eg YCbCr if input is RGB.
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* Fix it to get the right header markers for the image colorspace.
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*/
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jpeg_set_colorspace( dstinfo, srcinfo->jpeg_color_space );
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dstinfo->data_precision = srcinfo->data_precision;
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dstinfo->CCIR601_sampling = srcinfo->CCIR601_sampling;
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/* Copy the source's quantization tables. */
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for ( tblno = 0; tblno < NUM_QUANT_TBLS; tblno++ ) {
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if ( srcinfo->quant_tbl_ptrs[tblno] != NULL ) {
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qtblptr = &dstinfo->quant_tbl_ptrs[tblno];
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if ( *qtblptr == NULL ) {
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*qtblptr = jpeg_alloc_quant_table( (j_common_ptr) dstinfo );
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}
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MEMCOPY( ( *qtblptr )->quantval,
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srcinfo->quant_tbl_ptrs[tblno]->quantval,
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SIZEOF( ( *qtblptr )->quantval ) );
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( *qtblptr )->sent_table = FALSE;
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}
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}
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/* Copy the source's per-component info.
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* Note we assume jpeg_set_defaults has allocated the dest comp_info array.
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*/
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dstinfo->num_components = srcinfo->num_components;
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if ( ( dstinfo->num_components < 1 ) || ( dstinfo->num_components > MAX_COMPONENTS ) ) {
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ERREXIT2( dstinfo, JERR_COMPONENT_COUNT, dstinfo->num_components,
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MAX_COMPONENTS );
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}
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for ( ci = 0, incomp = srcinfo->comp_info, outcomp = dstinfo->comp_info;
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ci < dstinfo->num_components; ci++, incomp++, outcomp++ ) {
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outcomp->component_id = incomp->component_id;
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outcomp->h_samp_factor = incomp->h_samp_factor;
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outcomp->v_samp_factor = incomp->v_samp_factor;
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outcomp->quant_tbl_no = incomp->quant_tbl_no;
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/* Make sure saved quantization table for component matches the qtable
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* slot. If not, the input file re-used this qtable slot.
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* IJG encoder currently cannot duplicate this.
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*/
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tblno = outcomp->quant_tbl_no;
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if ( ( tblno < 0 ) || ( tblno >= NUM_QUANT_TBLS ) ||
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( srcinfo->quant_tbl_ptrs[tblno] == NULL ) ) {
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ERREXIT1( dstinfo, JERR_NO_QUANT_TABLE, tblno );
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}
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slot_quant = srcinfo->quant_tbl_ptrs[tblno];
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c_quant = incomp->quant_table;
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if ( c_quant != NULL ) {
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for ( coefi = 0; coefi < DCTSIZE2; coefi++ ) {
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if ( c_quant->quantval[coefi] != slot_quant->quantval[coefi] ) {
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ERREXIT1( dstinfo, JERR_MISMATCHED_QUANT_TABLE, tblno );
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}
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}
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}
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/* Note: we do not copy the source's Huffman table assignments;
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* instead we rely on jpeg_set_colorspace to have made a suitable choice.
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*/
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}
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}
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/*
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* Master selection of compression modules for transcoding.
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* This substitutes for jcinit.c's initialization of the full compressor.
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*/
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LOCAL void
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transencode_master_selection( j_compress_ptr cinfo,
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jvirt_barray_ptr * coef_arrays ) {
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/* Although we don't actually use input_components for transcoding,
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* jcmaster.c's initial_setup will complain if input_components is 0.
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*/
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cinfo->input_components = 1;
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/* Initialize master control (includes parameter checking/processing) */
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jinit_c_master_control( cinfo, TRUE /* transcode only */ );
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/* Entropy encoding: either Huffman or arithmetic coding. */
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if ( cinfo->arith_code ) {
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ERREXIT( cinfo, JERR_ARITH_NOTIMPL );
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} else {
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if ( cinfo->progressive_mode ) {
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#ifdef C_PROGRESSIVE_SUPPORTED
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jinit_phuff_encoder( cinfo );
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#else
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ERREXIT( cinfo, JERR_NOT_COMPILED );
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#endif
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} else {
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jinit_huff_encoder( cinfo );
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}
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}
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/* We need a special coefficient buffer controller. */
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transencode_coef_controller( cinfo, coef_arrays );
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jinit_marker_writer( cinfo );
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/* We can now tell the memory manager to allocate virtual arrays. */
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( *cinfo->mem->realize_virt_arrays )( (j_common_ptr) cinfo );
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/* Write the datastream header (SOI) immediately.
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* Frame and scan headers are postponed till later.
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* This lets application insert special markers after the SOI.
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*/
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( *cinfo->marker->write_file_header )( cinfo );
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}
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/*
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* The rest of this file is a special implementation of the coefficient
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* buffer controller. This is similar to jccoefct.c, but it handles only
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* output from presupplied virtual arrays. Furthermore, we generate any
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* dummy padding blocks on-the-fly rather than expecting them to be present
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* in the arrays.
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*/
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/* Private buffer controller object */
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typedef struct {
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struct jpeg_c_coef_controller pub;/* public fields */
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JDIMENSION iMCU_row_num;/* iMCU row # within image */
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JDIMENSION mcu_ctr; /* counts MCUs processed in current row */
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int MCU_vert_offset; /* counts MCU rows within iMCU row */
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int MCU_rows_per_iMCU_row; /* number of such rows needed */
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/* Virtual block array for each component. */
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jvirt_barray_ptr * whole_image;
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/* Workspace for constructing dummy blocks at right/bottom edges. */
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JBLOCKROW dummy_buffer[C_MAX_BLOCKS_IN_MCU];
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} my_coef_controller;
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typedef my_coef_controller * my_coef_ptr;
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LOCAL void
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start_iMCU_row( j_compress_ptr cinfo ) {
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/* Reset within-iMCU-row counters for a new row */
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my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
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/* In an interleaved scan, an MCU row is the same as an iMCU row.
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* In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows.
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* But at the bottom of the image, process only what's left.
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*/
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if ( cinfo->comps_in_scan > 1 ) {
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coef->MCU_rows_per_iMCU_row = 1;
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} else {
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if ( coef->iMCU_row_num < ( cinfo->total_iMCU_rows - 1 ) ) {
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coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor;
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} else {
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coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height;
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}
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}
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coef->mcu_ctr = 0;
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coef->MCU_vert_offset = 0;
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}
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/*
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* Initialize for a processing pass.
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*/
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METHODDEF void
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start_pass_coef( j_compress_ptr cinfo, J_BUF_MODE pass_mode ) {
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my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
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if ( pass_mode != JBUF_CRANK_DEST ) {
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ERREXIT( cinfo, JERR_BAD_BUFFER_MODE );
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}
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coef->iMCU_row_num = 0;
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start_iMCU_row( cinfo );
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}
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/*
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* Process some data.
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* We process the equivalent of one fully interleaved MCU row ("iMCU" row)
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* per call, ie, v_samp_factor block rows for each component in the scan.
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* The data is obtained from the virtual arrays and fed to the entropy coder.
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* Returns TRUE if the iMCU row is completed, FALSE if suspended.
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*
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* NB: input_buf is ignored; it is likely to be a NULL pointer.
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*/
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METHODDEF boolean
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compress_output( j_compress_ptr cinfo, JSAMPIMAGE input_buf ) {
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my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
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JDIMENSION MCU_col_num; /* index of current MCU within row */
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JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1;
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JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
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int blkn, ci, xindex, yindex, yoffset, blockcnt;
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JDIMENSION start_col;
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JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN];
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JBLOCKROW MCU_buffer[C_MAX_BLOCKS_IN_MCU];
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JBLOCKROW buffer_ptr;
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jpeg_component_info * compptr;
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/* Align the virtual buffers for the components used in this scan. */
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for ( ci = 0; ci < cinfo->comps_in_scan; ci++ ) {
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compptr = cinfo->cur_comp_info[ci];
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buffer[ci] = ( *cinfo->mem->access_virt_barray )
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( (j_common_ptr) cinfo, coef->whole_image[compptr->component_index],
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coef->iMCU_row_num * compptr->v_samp_factor,
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(JDIMENSION) compptr->v_samp_factor, FALSE );
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}
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/* Loop to process one whole iMCU row */
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for ( yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
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yoffset++ ) {
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for ( MCU_col_num = coef->mcu_ctr; MCU_col_num < cinfo->MCUs_per_row;
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MCU_col_num++ ) {
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/* Construct list of pointers to DCT blocks belonging to this MCU */
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blkn = 0; /* index of current DCT block within MCU */
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for ( ci = 0; ci < cinfo->comps_in_scan; ci++ ) {
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compptr = cinfo->cur_comp_info[ci];
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start_col = MCU_col_num * compptr->MCU_width;
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blockcnt = ( MCU_col_num < last_MCU_col ) ? compptr->MCU_width
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: compptr->last_col_width;
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for ( yindex = 0; yindex < compptr->MCU_height; yindex++ ) {
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if ( ( coef->iMCU_row_num < last_iMCU_row ) ||
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( yindex + yoffset < compptr->last_row_height ) ) {
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/* Fill in pointers to real blocks in this row */
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buffer_ptr = buffer[ci][yindex + yoffset] + start_col;
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for ( xindex = 0; xindex < blockcnt; xindex++ ) {
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MCU_buffer[blkn++] = buffer_ptr++;
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}
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} else {
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/* At bottom of image, need a whole row of dummy blocks */
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xindex = 0;
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}
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/* Fill in any dummy blocks needed in this row.
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* Dummy blocks are filled in the same way as in jccoefct.c:
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* all zeroes in the AC entries, DC entries equal to previous
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* block's DC value. The init routine has already zeroed the
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* AC entries, so we need only set the DC entries correctly.
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*/
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for (; xindex < compptr->MCU_width; xindex++ ) {
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MCU_buffer[blkn] = coef->dummy_buffer[blkn];
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MCU_buffer[blkn][0][0] = MCU_buffer[blkn - 1][0][0];
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blkn++;
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}
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}
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}
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/* Try to write the MCU. */
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if ( !( *cinfo->entropy->encode_mcu )( cinfo, MCU_buffer ) ) {
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/* Suspension forced; update state counters and exit */
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coef->MCU_vert_offset = yoffset;
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coef->mcu_ctr = MCU_col_num;
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return FALSE;
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}
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}
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/* Completed an MCU row, but perhaps not an iMCU row */
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coef->mcu_ctr = 0;
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}
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/* Completed the iMCU row, advance counters for next one */
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coef->iMCU_row_num++;
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start_iMCU_row( cinfo );
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return TRUE;
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}
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/*
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* Initialize coefficient buffer controller.
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*
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* Each passed coefficient array must be the right size for that
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* coefficient: width_in_blocks wide and height_in_blocks high,
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* with unitheight at least v_samp_factor.
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*/
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LOCAL void
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transencode_coef_controller( j_compress_ptr cinfo,
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jvirt_barray_ptr * coef_arrays ) {
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my_coef_ptr coef;
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JBLOCKROW buffer;
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int i;
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coef = (my_coef_ptr)
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( *cinfo->mem->alloc_small )( (j_common_ptr) cinfo, JPOOL_IMAGE,
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SIZEOF( my_coef_controller ) );
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cinfo->coef = (struct jpeg_c_coef_controller *) coef;
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coef->pub.start_pass = start_pass_coef;
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coef->pub.compress_data = compress_output;
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/* Save pointer to virtual arrays */
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coef->whole_image = coef_arrays;
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/* Allocate and pre-zero space for dummy DCT blocks. */
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buffer = (JBLOCKROW)
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( *cinfo->mem->alloc_large )( (j_common_ptr) cinfo, JPOOL_IMAGE,
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C_MAX_BLOCKS_IN_MCU * SIZEOF( JBLOCK ) );
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jzero_far( (void FAR *) buffer, C_MAX_BLOCKS_IN_MCU * SIZEOF( JBLOCK ) );
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for ( i = 0; i < C_MAX_BLOCKS_IN_MCU; i++ ) {
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coef->dummy_buffer[i] = buffer + i;
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}
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}
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