170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * jctrans.c 370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Copyright (C) 1995-1998, Thomas G. Lane. 570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This file is part of the Independent JPEG Group's software. 670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * For conditions of distribution and use, see the accompanying README file. 770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This file contains library routines for transcoding compression, 970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * that is, writing raw DCT coefficient arrays to an output JPEG file. 1070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * The routines in jcapimin.c will also be needed by a transcoder. 1170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 1270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 1370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#define JPEG_INTERNALS 1470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include "jinclude.h" 1570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#include "jpeglib.h" 1670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 1770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 1870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Forward declarations */ 1970a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(void) transencode_master_selection 2070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JPP((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays)); 2170a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(void) transencode_coef_controller 2270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JPP((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays)); 2370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 2470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 2570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 2670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Compression initialization for writing raw-coefficient data. 2770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Before calling this, all parameters and a data destination must be set up. 2870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Call jpeg_finish_compress() to actually write the data. 2970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 3070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * The number of passed virtual arrays must match cinfo->num_components. 3170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Note that the virtual arrays need not be filled or even realized at 3270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * the time write_coefficients is called; indeed, if the virtual arrays 3370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * were requested from this compression object's memory manager, they 3470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * typically will be realized during this routine and filled afterwards. 3570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 3670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 3770a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(void) 3870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_write_coefficients (j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays) 3970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 4070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->global_state != CSTATE_START) 4170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 4270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Mark all tables to be written */ 4370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jpeg_suppress_tables(cinfo, FALSE); 4470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* (Re)initialize error mgr and destination modules */ 4570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo); 4670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->dest->init_destination) (cinfo); 4770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Perform master selection of active modules */ 4870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine transencode_master_selection(cinfo, coef_arrays); 4970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Wait for jpeg_finish_compress() call */ 5070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->next_scanline = 0; /* so jpeg_write_marker works */ 5170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->global_state = CSTATE_WRCOEFS; 5270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 5370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 5470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 5570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 5670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Initialize the compression object with default parameters, 5770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * then copy from the source object all parameters needed for lossless 5870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * transcoding. Parameters that can be varied without loss (such as 5970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * scan script and Huffman optimization) are left in their default states. 6070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 6170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 6270a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineGLOBAL(void) 6370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinejpeg_copy_critical_parameters (j_decompress_ptr srcinfo, 6470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine j_compress_ptr dstinfo) 6570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 6670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JQUANT_TBL ** qtblptr; 6770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jpeg_component_info *incomp, *outcomp; 6870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JQUANT_TBL *c_quant, *slot_quant; 6970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int tblno, ci, coefi; 7070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 7170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Safety check to ensure start_compress not called yet. */ 7270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (dstinfo->global_state != CSTATE_START) 7370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT1(dstinfo, JERR_BAD_STATE, dstinfo->global_state); 7470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Copy fundamental image dimensions */ 7570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine dstinfo->image_width = srcinfo->image_width; 7670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine dstinfo->image_height = srcinfo->image_height; 7770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine dstinfo->input_components = srcinfo->num_components; 7870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine dstinfo->in_color_space = srcinfo->jpeg_color_space; 7970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Initialize all parameters to default values */ 8070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jpeg_set_defaults(dstinfo); 8170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* jpeg_set_defaults may choose wrong colorspace, eg YCbCr if input is RGB. 8270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Fix it to get the right header markers for the image colorspace. 8370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 8470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jpeg_set_colorspace(dstinfo, srcinfo->jpeg_color_space); 8570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine dstinfo->data_precision = srcinfo->data_precision; 8670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine dstinfo->CCIR601_sampling = srcinfo->CCIR601_sampling; 8770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Copy the source's quantization tables. */ 8870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) { 8970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (srcinfo->quant_tbl_ptrs[tblno] != NULL) { 9070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine qtblptr = & dstinfo->quant_tbl_ptrs[tblno]; 9170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (*qtblptr == NULL) 9270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine *qtblptr = jpeg_alloc_quant_table((j_common_ptr) dstinfo); 9370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine MEMCOPY((*qtblptr)->quantval, 9470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine srcinfo->quant_tbl_ptrs[tblno]->quantval, 9570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine SIZEOF((*qtblptr)->quantval)); 9670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*qtblptr)->sent_table = FALSE; 9770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 9870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 9970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Copy the source's per-component info. 10070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Note we assume jpeg_set_defaults has allocated the dest comp_info array. 10170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 10270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine dstinfo->num_components = srcinfo->num_components; 10370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (dstinfo->num_components < 1 || dstinfo->num_components > MAX_COMPONENTS) 10470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT2(dstinfo, JERR_COMPONENT_COUNT, dstinfo->num_components, 10570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine MAX_COMPONENTS); 10670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (ci = 0, incomp = srcinfo->comp_info, outcomp = dstinfo->comp_info; 10770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ci < dstinfo->num_components; ci++, incomp++, outcomp++) { 10870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outcomp->component_id = incomp->component_id; 10970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outcomp->h_samp_factor = incomp->h_samp_factor; 11070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outcomp->v_samp_factor = incomp->v_samp_factor; 11170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine outcomp->quant_tbl_no = incomp->quant_tbl_no; 11270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Make sure saved quantization table for component matches the qtable 11370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * slot. If not, the input file re-used this qtable slot. 11470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * IJG encoder currently cannot duplicate this. 11570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 11670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine tblno = outcomp->quant_tbl_no; 11770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (tblno < 0 || tblno >= NUM_QUANT_TBLS || 11870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine srcinfo->quant_tbl_ptrs[tblno] == NULL) 11970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT1(dstinfo, JERR_NO_QUANT_TABLE, tblno); 12070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine slot_quant = srcinfo->quant_tbl_ptrs[tblno]; 12170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine c_quant = incomp->quant_table; 12270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (c_quant != NULL) { 12370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (coefi = 0; coefi < DCTSIZE2; coefi++) { 12470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (c_quant->quantval[coefi] != slot_quant->quantval[coefi]) 12570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT1(dstinfo, JERR_MISMATCHED_QUANT_TABLE, tblno); 12670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 12770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 12870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Note: we do not copy the source's Huffman table assignments; 12970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * instead we rely on jpeg_set_colorspace to have made a suitable choice. 13070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 13170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 13270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Also copy JFIF version and resolution information, if available. 13370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Strictly speaking this isn't "critical" info, but it's nearly 13470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * always appropriate to copy it if available. In particular, 13570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * if the application chooses to copy JFIF 1.02 extension markers from 13670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * the source file, we need to copy the version to make sure we don't 13770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * emit a file that has 1.02 extensions but a claimed version of 1.01. 13870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * We will *not*, however, copy version info from mislabeled "2.01" files. 13970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 14070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (srcinfo->saw_JFIF_marker) { 14170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (srcinfo->JFIF_major_version == 1) { 14270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine dstinfo->JFIF_major_version = srcinfo->JFIF_major_version; 14370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine dstinfo->JFIF_minor_version = srcinfo->JFIF_minor_version; 14470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 14570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine dstinfo->density_unit = srcinfo->density_unit; 14670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine dstinfo->X_density = srcinfo->X_density; 14770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine dstinfo->Y_density = srcinfo->Y_density; 14870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 14970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 15070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 15170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 15270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 15370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Master selection of compression modules for transcoding. 15470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This substitutes for jcinit.c's initialization of the full compressor. 15570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 15670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 15770a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(void) 15870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinetransencode_master_selection (j_compress_ptr cinfo, 15970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jvirt_barray_ptr * coef_arrays) 16070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 16170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Although we don't actually use input_components for transcoding, 16270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * jcmaster.c's initial_setup will complain if input_components is 0. 16370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 16470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->input_components = 1; 16570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Initialize master control (includes parameter checking/processing) */ 16670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jinit_c_master_control(cinfo, TRUE /* transcode only */); 16770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 16870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Entropy encoding: either Huffman or arithmetic coding. */ 16970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->arith_code) { 17070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT(cinfo, JERR_ARITH_NOTIMPL); 17170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } else { 17270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->progressive_mode) { 17370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#ifdef C_PROGRESSIVE_SUPPORTED 17470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jinit_phuff_encoder(cinfo); 17570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#else 17670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT(cinfo, JERR_NOT_COMPILED); 17770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine#endif 17870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } else 17970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jinit_huff_encoder(cinfo); 18070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 18170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 18270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* We need a special coefficient buffer controller. */ 18370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine transencode_coef_controller(cinfo, coef_arrays); 18470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 18570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jinit_marker_writer(cinfo); 18670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 18770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* We can now tell the memory manager to allocate virtual arrays. */ 18870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo); 18970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 19070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Write the datastream header (SOI, JFIF) immediately. 19170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Frame and scan headers are postponed till later. 19270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * This lets application insert special markers after the SOI. 19370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 19470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->marker->write_file_header) (cinfo); 19570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 19670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 19770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 19870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 19970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * The rest of this file is a special implementation of the coefficient 20070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * buffer controller. This is similar to jccoefct.c, but it handles only 20170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * output from presupplied virtual arrays. Furthermore, we generate any 20270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * dummy padding blocks on-the-fly rather than expecting them to be present 20370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * in the arrays. 20470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 20570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 20670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Private buffer controller object */ 20770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 20870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinetypedef struct { 20970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine struct jpeg_c_coef_controller pub; /* public fields */ 21070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 21170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JDIMENSION iMCU_row_num; /* iMCU row # within image */ 21270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JDIMENSION mcu_ctr; /* counts MCUs processed in current row */ 21370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int MCU_vert_offset; /* counts MCU rows within iMCU row */ 21470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int MCU_rows_per_iMCU_row; /* number of such rows needed */ 21570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 21670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Virtual block array for each component. */ 21770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jvirt_barray_ptr * whole_image; 21870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 21970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Workspace for constructing dummy blocks at right/bottom edges. */ 22070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JBLOCKROW dummy_buffer[C_MAX_BLOCKS_IN_MCU]; 22170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} my_coef_controller; 22270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 22370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinetypedef my_coef_controller * my_coef_ptr; 22470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 22570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 22670a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(void) 22770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinestart_iMCU_row (j_compress_ptr cinfo) 22870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* Reset within-iMCU-row counters for a new row */ 22970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 23070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 23170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 23270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* In an interleaved scan, an MCU row is the same as an iMCU row. 23370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows. 23470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * But at the bottom of the image, process only what's left. 23570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 23670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (cinfo->comps_in_scan > 1) { 23770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine coef->MCU_rows_per_iMCU_row = 1; 23870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } else { 23970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (coef->iMCU_row_num < (cinfo->total_iMCU_rows-1)) 24070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor; 24170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine else 24270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height; 24370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 24470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 24570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine coef->mcu_ctr = 0; 24670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine coef->MCU_vert_offset = 0; 24770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 24870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 24970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 25070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 25170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Initialize for a processing pass. 25270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 25370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 25470a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(void) 25570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinestart_pass_coef (j_compress_ptr cinfo, J_BUF_MODE pass_mode) 25670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 25770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 25870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 25970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (pass_mode != JBUF_CRANK_DEST) 26070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); 26170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 26270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine coef->iMCU_row_num = 0; 26370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine start_iMCU_row(cinfo); 26470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 26570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 26670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 26770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 26870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Process some data. 26970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * We process the equivalent of one fully interleaved MCU row ("iMCU" row) 27070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * per call, ie, v_samp_factor block rows for each component in the scan. 27170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * The data is obtained from the virtual arrays and fed to the entropy coder. 27270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Returns TRUE if the iMCU row is completed, FALSE if suspended. 27370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 27470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * NB: input_buf is ignored; it is likely to be a NULL pointer. 27570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 27670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 27770a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineMETHODDEF(boolean) 27870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinecompress_output (j_compress_ptr cinfo, JSAMPIMAGE input_buf) 27970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 28070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 28170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JDIMENSION MCU_col_num; /* index of current MCU within row */ 28270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1; 28370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; 28470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int blkn, ci, xindex, yindex, yoffset, blockcnt; 28570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JDIMENSION start_col; 28670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN]; 28770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JBLOCKROW MCU_buffer[C_MAX_BLOCKS_IN_MCU]; 28870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JBLOCKROW buffer_ptr; 28970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jpeg_component_info *compptr; 29070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 29170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Align the virtual buffers for the components used in this scan. */ 29270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 29370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr = cinfo->cur_comp_info[ci]; 29470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine buffer[ci] = (*cinfo->mem->access_virt_barray) 29570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index], 29670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine coef->iMCU_row_num * compptr->v_samp_factor, 29770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (JDIMENSION) compptr->v_samp_factor, FALSE); 29870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 29970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 30070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Loop to process one whole iMCU row */ 30170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row; 30270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine yoffset++) { 30370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (MCU_col_num = coef->mcu_ctr; MCU_col_num < cinfo->MCUs_per_row; 30470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine MCU_col_num++) { 30570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Construct list of pointers to DCT blocks belonging to this MCU */ 30670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine blkn = 0; /* index of current DCT block within MCU */ 30770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 30870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine compptr = cinfo->cur_comp_info[ci]; 30970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine start_col = MCU_col_num * compptr->MCU_width; 31070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine blockcnt = (MCU_col_num < last_MCU_col) ? compptr->MCU_width 31170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine : compptr->last_col_width; 31270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (yindex = 0; yindex < compptr->MCU_height; yindex++) { 31370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (coef->iMCU_row_num < last_iMCU_row || 31470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine yindex+yoffset < compptr->last_row_height) { 31570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Fill in pointers to real blocks in this row */ 31670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine buffer_ptr = buffer[ci][yindex+yoffset] + start_col; 31770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (xindex = 0; xindex < blockcnt; xindex++) 31870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine MCU_buffer[blkn++] = buffer_ptr++; 31970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } else { 32070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* At bottom of image, need a whole row of dummy blocks */ 32170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine xindex = 0; 32270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 32370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Fill in any dummy blocks needed in this row. 32470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Dummy blocks are filled in the same way as in jccoefct.c: 32570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * all zeroes in the AC entries, DC entries equal to previous 32670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * block's DC value. The init routine has already zeroed the 32770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * AC entries, so we need only set the DC entries correctly. 32870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 32970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (; xindex < compptr->MCU_width; xindex++) { 33070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine MCU_buffer[blkn] = coef->dummy_buffer[blkn]; 33170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine MCU_buffer[blkn][0][0] = MCU_buffer[blkn-1][0][0]; 33270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine blkn++; 33370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 33470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 33570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 33670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Try to write the MCU. */ 33770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine if (! (*cinfo->entropy->encode_mcu) (cinfo, MCU_buffer)) { 33870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Suspension forced; update state counters and exit */ 33970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine coef->MCU_vert_offset = yoffset; 34070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine coef->mcu_ctr = MCU_col_num; 34170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return FALSE; 34270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 34370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 34470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Completed an MCU row, but perhaps not an iMCU row */ 34570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine coef->mcu_ctr = 0; 34670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 34770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Completed the iMCU row, advance counters for next one */ 34870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine coef->iMCU_row_num++; 34970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine start_iMCU_row(cinfo); 35070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine return TRUE; 35170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 35270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 35370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 35470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine/* 35570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Initialize coefficient buffer controller. 35670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * 35770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * Each passed coefficient array must be the right size for that 35870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * coefficient: width_in_blocks wide and height_in_blocks high, 35970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine * with unitheight at least v_samp_factor. 36070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine */ 36170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 36270a18cd874a22452aca9e39e22275ed4538ed20bVladimir ChtchetkineLOCAL(void) 36370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkinetransencode_coef_controller (j_compress_ptr cinfo, 36470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jvirt_barray_ptr * coef_arrays) 36570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine{ 36670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine my_coef_ptr coef; 36770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine JBLOCKROW buffer; 36870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine int i; 36970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 37070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine coef = (my_coef_ptr) 37170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 37270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine SIZEOF(my_coef_controller)); 37370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine cinfo->coef = (struct jpeg_c_coef_controller *) coef; 37470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine coef->pub.start_pass = start_pass_coef; 37570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine coef->pub.compress_data = compress_output; 37670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 37770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Save pointer to virtual arrays */ 37870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine coef->whole_image = coef_arrays; 37970a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine 38070a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine /* Allocate and pre-zero space for dummy DCT blocks. */ 38170a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine buffer = (JBLOCKROW) 38270a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE, 38370a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK)); 38470a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine jzero_far((void FAR *) buffer, C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK)); 38570a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine for (i = 0; i < C_MAX_BLOCKS_IN_MCU; i++) { 38670a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine coef->dummy_buffer[i] = buffer + i; 38770a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine } 38870a18cd874a22452aca9e39e22275ed4538ed20bVladimir Chtchetkine} 389