1793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* 2793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * jctrans.c 3793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * 4793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Copyright (C) 1995-1998, Thomas G. Lane. 5793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Modified 2000-2012 by Guido Vollbeding. 6793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * This file is part of the Independent JPEG Group's software. 7793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * For conditions of distribution and use, see the accompanying README file. 8793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * 9793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * This file contains library routines for transcoding compression, 10793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * that is, writing raw DCT coefficient arrays to an output JPEG file. 11793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * The routines in jcapimin.c will also be needed by a transcoder. 12793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 13793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 14793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#define JPEG_INTERNALS 15793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#include "jinclude.h" 16793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler#include "jpeglib.h" 17793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 18793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 19793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* Forward declarations */ 20793ee12c6df9cad3806238d32528c49a3ff9331dNoah PreslerLOCAL(void) transencode_master_selection 21793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler JPP((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays)); 22793ee12c6df9cad3806238d32528c49a3ff9331dNoah PreslerLOCAL(void) transencode_coef_controller 23793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler JPP((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays)); 24793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 25793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 26793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* 27793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Compression initialization for writing raw-coefficient data. 28793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Before calling this, all parameters and a data destination must be set up. 29793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Call jpeg_finish_compress() to actually write the data. 30793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * 31793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * The number of passed virtual arrays must match cinfo->num_components. 32793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Note that the virtual arrays need not be filled or even realized at 33793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * the time write_coefficients is called; indeed, if the virtual arrays 34793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * were requested from this compression object's memory manager, they 35793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * typically will be realized during this routine and filled afterwards. 36793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 37793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 38793ee12c6df9cad3806238d32528c49a3ff9331dNoah PreslerGLOBAL(void) 39793ee12c6df9cad3806238d32528c49a3ff9331dNoah Preslerjpeg_write_coefficients (j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays) 40793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler{ 41793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->global_state != CSTATE_START) 42793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 43793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Mark all tables to be written */ 44793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jpeg_suppress_tables(cinfo, FALSE); 45793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* (Re)initialize error mgr and destination modules */ 46793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo); 47793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->dest->init_destination) (cinfo); 48793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Perform master selection of active modules */ 49793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler transencode_master_selection(cinfo, coef_arrays); 50793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Wait for jpeg_finish_compress() call */ 51793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->next_scanline = 0; /* so jpeg_write_marker works */ 52793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->global_state = CSTATE_WRCOEFS; 53793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler} 54793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 55793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 56793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* 57793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Initialize the compression object with default parameters, 58793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * then copy from the source object all parameters needed for lossless 59793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * transcoding. Parameters that can be varied without loss (such as 60793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * scan script and Huffman optimization) are left in their default states. 61793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 62793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 63793ee12c6df9cad3806238d32528c49a3ff9331dNoah PreslerGLOBAL(void) 64793ee12c6df9cad3806238d32528c49a3ff9331dNoah Preslerjpeg_copy_critical_parameters (j_decompress_ptr srcinfo, 65793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler j_compress_ptr dstinfo) 66793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler{ 67793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler JQUANT_TBL ** qtblptr; 68793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jpeg_component_info *incomp, *outcomp; 69793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler JQUANT_TBL *c_quant, *slot_quant; 70793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler int tblno, ci, coefi; 71793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 72793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Safety check to ensure start_compress not called yet. */ 73793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (dstinfo->global_state != CSTATE_START) 74793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ERREXIT1(dstinfo, JERR_BAD_STATE, dstinfo->global_state); 75793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Copy fundamental image dimensions */ 76793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler dstinfo->image_width = srcinfo->image_width; 77793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler dstinfo->image_height = srcinfo->image_height; 78793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler dstinfo->input_components = srcinfo->num_components; 79793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler dstinfo->in_color_space = srcinfo->jpeg_color_space; 80793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler dstinfo->jpeg_width = srcinfo->output_width; 81793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler dstinfo->jpeg_height = srcinfo->output_height; 82793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler dstinfo->min_DCT_h_scaled_size = srcinfo->min_DCT_h_scaled_size; 83793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler dstinfo->min_DCT_v_scaled_size = srcinfo->min_DCT_v_scaled_size; 84793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Initialize all parameters to default values */ 85793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jpeg_set_defaults(dstinfo); 86793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* jpeg_set_defaults may choose wrong colorspace, eg YCbCr if input is RGB. 87793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Fix it to get the right header markers for the image colorspace. 88793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Note: Entropy table assignment in jpeg_set_colorspace depends 89793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * on color_transform. 90793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 91793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler dstinfo->color_transform = srcinfo->color_transform; 92793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jpeg_set_colorspace(dstinfo, srcinfo->jpeg_color_space); 93793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler dstinfo->data_precision = srcinfo->data_precision; 94793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler dstinfo->CCIR601_sampling = srcinfo->CCIR601_sampling; 95793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Copy the source's quantization tables. */ 96793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) { 97793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (srcinfo->quant_tbl_ptrs[tblno] != NULL) { 98793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler qtblptr = & dstinfo->quant_tbl_ptrs[tblno]; 99793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (*qtblptr == NULL) 100793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler *qtblptr = jpeg_alloc_quant_table((j_common_ptr) dstinfo); 101793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler MEMCOPY((*qtblptr)->quantval, 102793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler srcinfo->quant_tbl_ptrs[tblno]->quantval, 103793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler SIZEOF((*qtblptr)->quantval)); 104793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*qtblptr)->sent_table = FALSE; 105793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 106793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 107793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Copy the source's per-component info. 108793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Note we assume jpeg_set_defaults has allocated the dest comp_info array. 109793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 110793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler dstinfo->num_components = srcinfo->num_components; 111793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (dstinfo->num_components < 1 || dstinfo->num_components > MAX_COMPONENTS) 112793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ERREXIT2(dstinfo, JERR_COMPONENT_COUNT, dstinfo->num_components, 113793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler MAX_COMPONENTS); 114793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler for (ci = 0, incomp = srcinfo->comp_info, outcomp = dstinfo->comp_info; 115793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ci < dstinfo->num_components; ci++, incomp++, outcomp++) { 116793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler outcomp->component_id = incomp->component_id; 117793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler outcomp->h_samp_factor = incomp->h_samp_factor; 118793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler outcomp->v_samp_factor = incomp->v_samp_factor; 119793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler outcomp->quant_tbl_no = incomp->quant_tbl_no; 120793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Make sure saved quantization table for component matches the qtable 121793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * slot. If not, the input file re-used this qtable slot. 122793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * IJG encoder currently cannot duplicate this. 123793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 124793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler tblno = outcomp->quant_tbl_no; 125793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (tblno < 0 || tblno >= NUM_QUANT_TBLS || 126793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler srcinfo->quant_tbl_ptrs[tblno] == NULL) 127793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ERREXIT1(dstinfo, JERR_NO_QUANT_TABLE, tblno); 128793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler slot_quant = srcinfo->quant_tbl_ptrs[tblno]; 129793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler c_quant = incomp->quant_table; 130793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (c_quant != NULL) { 131793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler for (coefi = 0; coefi < DCTSIZE2; coefi++) { 132793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (c_quant->quantval[coefi] != slot_quant->quantval[coefi]) 133793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ERREXIT1(dstinfo, JERR_MISMATCHED_QUANT_TABLE, tblno); 134793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 135793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 136793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Note: we do not copy the source's entropy table assignments; 137793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * instead we rely on jpeg_set_colorspace to have made a suitable choice. 138793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 139793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 140793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Also copy JFIF version and resolution information, if available. 141793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Strictly speaking this isn't "critical" info, but it's nearly 142793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * always appropriate to copy it if available. In particular, 143793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * if the application chooses to copy JFIF 1.02 extension markers from 144793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * the source file, we need to copy the version to make sure we don't 145793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * emit a file that has 1.02 extensions but a claimed version of 1.01. 146793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * We will *not*, however, copy version info from mislabeled "2.01" files. 147793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 148793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (srcinfo->saw_JFIF_marker) { 149793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (srcinfo->JFIF_major_version == 1) { 150793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler dstinfo->JFIF_major_version = srcinfo->JFIF_major_version; 151793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler dstinfo->JFIF_minor_version = srcinfo->JFIF_minor_version; 152793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 153793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler dstinfo->density_unit = srcinfo->density_unit; 154793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler dstinfo->X_density = srcinfo->X_density; 155793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler dstinfo->Y_density = srcinfo->Y_density; 156793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 157793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler} 158793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 159793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 160793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* 161793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Master selection of compression modules for transcoding. 162793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * This substitutes for jcinit.c's initialization of the full compressor. 163793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 164793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 165793ee12c6df9cad3806238d32528c49a3ff9331dNoah PreslerLOCAL(void) 166793ee12c6df9cad3806238d32528c49a3ff9331dNoah Preslertransencode_master_selection (j_compress_ptr cinfo, 167793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jvirt_barray_ptr * coef_arrays) 168793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler{ 169793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Initialize master control (includes parameter checking/processing) */ 170793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jinit_c_master_control(cinfo, TRUE /* transcode only */); 171793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 172793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Entropy encoding: either Huffman or arithmetic coding. */ 173793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->arith_code) 174793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jinit_arith_encoder(cinfo); 175793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler else { 176793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jinit_huff_encoder(cinfo); 177793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 178793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 179793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* We need a special coefficient buffer controller. */ 180793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler transencode_coef_controller(cinfo, coef_arrays); 181793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 182793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jinit_marker_writer(cinfo); 183793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 184793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* We can now tell the memory manager to allocate virtual arrays. */ 185793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo); 186793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 187793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Write the datastream header (SOI, JFIF) immediately. 188793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Frame and scan headers are postponed till later. 189793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * This lets application insert special markers after the SOI. 190793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 191793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->marker->write_file_header) (cinfo); 192793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler} 193793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 194793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 195793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* 196793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * The rest of this file is a special implementation of the coefficient 197793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * buffer controller. This is similar to jccoefct.c, but it handles only 198793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * output from presupplied virtual arrays. Furthermore, we generate any 199793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * dummy padding blocks on-the-fly rather than expecting them to be present 200793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * in the arrays. 201793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 202793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 203793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* Private buffer controller object */ 204793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 205793ee12c6df9cad3806238d32528c49a3ff9331dNoah Preslertypedef struct { 206793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler struct jpeg_c_coef_controller pub; /* public fields */ 207793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 208793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler JDIMENSION iMCU_row_num; /* iMCU row # within image */ 209793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler JDIMENSION mcu_ctr; /* counts MCUs processed in current row */ 210793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler int MCU_vert_offset; /* counts MCU rows within iMCU row */ 211793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler int MCU_rows_per_iMCU_row; /* number of such rows needed */ 212793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 213793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Virtual block array for each component. */ 214793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jvirt_barray_ptr * whole_image; 215793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 216793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Workspace for constructing dummy blocks at right/bottom edges. */ 217793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler JBLOCKROW dummy_buffer[C_MAX_BLOCKS_IN_MCU]; 218793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler} my_coef_controller; 219793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 220793ee12c6df9cad3806238d32528c49a3ff9331dNoah Preslertypedef my_coef_controller * my_coef_ptr; 221793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 222793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 223793ee12c6df9cad3806238d32528c49a3ff9331dNoah PreslerLOCAL(void) 224793ee12c6df9cad3806238d32528c49a3ff9331dNoah Preslerstart_iMCU_row (j_compress_ptr cinfo) 225793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* Reset within-iMCU-row counters for a new row */ 226793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler{ 227793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 228793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 229793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* In an interleaved scan, an MCU row is the same as an iMCU row. 230793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows. 231793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * But at the bottom of the image, process only what's left. 232793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 233793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (cinfo->comps_in_scan > 1) { 234793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler coef->MCU_rows_per_iMCU_row = 1; 235793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } else { 236793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (coef->iMCU_row_num < (cinfo->total_iMCU_rows-1)) 237793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor; 238793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler else 239793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height; 240793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 241793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 242793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler coef->mcu_ctr = 0; 243793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler coef->MCU_vert_offset = 0; 244793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler} 245793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 246793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 247793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* 248793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Initialize for a processing pass. 249793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 250793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 251793ee12c6df9cad3806238d32528c49a3ff9331dNoah PreslerMETHODDEF(void) 252793ee12c6df9cad3806238d32528c49a3ff9331dNoah Preslerstart_pass_coef (j_compress_ptr cinfo, J_BUF_MODE pass_mode) 253793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler{ 254793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 255793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 256793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (pass_mode != JBUF_CRANK_DEST) 257793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); 258793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 259793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler coef->iMCU_row_num = 0; 260793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler start_iMCU_row(cinfo); 261793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler} 262793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 263793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 264793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* 265793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Process some data. 266793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * We process the equivalent of one fully interleaved MCU row ("iMCU" row) 267793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * per call, ie, v_samp_factor block rows for each component in the scan. 268793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * The data is obtained from the virtual arrays and fed to the entropy coder. 269793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Returns TRUE if the iMCU row is completed, FALSE if suspended. 270793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * 271793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * NB: input_buf is ignored; it is likely to be a NULL pointer. 272793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 273793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 274793ee12c6df9cad3806238d32528c49a3ff9331dNoah PreslerMETHODDEF(boolean) 275793ee12c6df9cad3806238d32528c49a3ff9331dNoah Preslercompress_output (j_compress_ptr cinfo, JSAMPIMAGE input_buf) 276793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler{ 277793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 278793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler JDIMENSION MCU_col_num; /* index of current MCU within row */ 279793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1; 280793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; 281793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler int blkn, ci, xindex, yindex, yoffset, blockcnt; 282793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler JDIMENSION start_col; 283793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN]; 284793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler JBLOCKROW MCU_buffer[C_MAX_BLOCKS_IN_MCU]; 285793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler JBLOCKROW buffer_ptr; 286793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jpeg_component_info *compptr; 287793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 288793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Align the virtual buffers for the components used in this scan. */ 289793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 290793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler compptr = cinfo->cur_comp_info[ci]; 291793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler buffer[ci] = (*cinfo->mem->access_virt_barray) 292793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index], 293793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler coef->iMCU_row_num * compptr->v_samp_factor, 294793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (JDIMENSION) compptr->v_samp_factor, FALSE); 295793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 296793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 297793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Loop to process one whole iMCU row */ 298793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row; 299793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler yoffset++) { 300793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler for (MCU_col_num = coef->mcu_ctr; MCU_col_num < cinfo->MCUs_per_row; 301793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler MCU_col_num++) { 302793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Construct list of pointers to DCT blocks belonging to this MCU */ 303793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler blkn = 0; /* index of current DCT block within MCU */ 304793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 305793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler compptr = cinfo->cur_comp_info[ci]; 306793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler start_col = MCU_col_num * compptr->MCU_width; 307793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler blockcnt = (MCU_col_num < last_MCU_col) ? compptr->MCU_width 308793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler : compptr->last_col_width; 309793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler for (yindex = 0; yindex < compptr->MCU_height; yindex++) { 310793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (coef->iMCU_row_num < last_iMCU_row || 311793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler yindex+yoffset < compptr->last_row_height) { 312793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Fill in pointers to real blocks in this row */ 313793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler buffer_ptr = buffer[ci][yindex+yoffset] + start_col; 314793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler for (xindex = 0; xindex < blockcnt; xindex++) 315793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler MCU_buffer[blkn++] = buffer_ptr++; 316793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } else { 317793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* At bottom of image, need a whole row of dummy blocks */ 318793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler xindex = 0; 319793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 320793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Fill in any dummy blocks needed in this row. 321793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Dummy blocks are filled in the same way as in jccoefct.c: 322793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * all zeroes in the AC entries, DC entries equal to previous 323793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * block's DC value. The init routine has already zeroed the 324793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * AC entries, so we need only set the DC entries correctly. 325793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 326793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler for (; xindex < compptr->MCU_width; xindex++) { 327793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler MCU_buffer[blkn] = coef->dummy_buffer[blkn]; 328793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler MCU_buffer[blkn][0][0] = MCU_buffer[blkn-1][0][0]; 329793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler blkn++; 330793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 331793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 332793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 333793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Try to write the MCU. */ 334793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler if (! (*cinfo->entropy->encode_mcu) (cinfo, MCU_buffer)) { 335793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Suspension forced; update state counters and exit */ 336793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler coef->MCU_vert_offset = yoffset; 337793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler coef->mcu_ctr = MCU_col_num; 338793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler return FALSE; 339793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 340793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 341793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Completed an MCU row, but perhaps not an iMCU row */ 342793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler coef->mcu_ctr = 0; 343793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 344793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Completed the iMCU row, advance counters for next one */ 345793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler coef->iMCU_row_num++; 346793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler start_iMCU_row(cinfo); 347793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler return TRUE; 348793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler} 349793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 350793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 351793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler/* 352793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Initialize coefficient buffer controller. 353793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * 354793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * Each passed coefficient array must be the right size for that 355793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * coefficient: width_in_blocks wide and height_in_blocks high, 356793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler * with unitheight at least v_samp_factor. 357793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler */ 358793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 359793ee12c6df9cad3806238d32528c49a3ff9331dNoah PreslerLOCAL(void) 360793ee12c6df9cad3806238d32528c49a3ff9331dNoah Preslertransencode_coef_controller (j_compress_ptr cinfo, 361793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler jvirt_barray_ptr * coef_arrays) 362793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler{ 363793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler my_coef_ptr coef; 364793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler JBLOCKROW buffer; 365793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler int i; 366793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 367793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler coef = (my_coef_ptr) 368793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 369793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler SIZEOF(my_coef_controller)); 370793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler cinfo->coef = &coef->pub; 371793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler coef->pub.start_pass = start_pass_coef; 372793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler coef->pub.compress_data = compress_output; 373793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 374793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Save pointer to virtual arrays */ 375793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler coef->whole_image = coef_arrays; 376793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler 377793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler /* Allocate and pre-zero space for dummy DCT blocks. */ 378793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler buffer = (JBLOCKROW) 379793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE, 380793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK)); 381793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler FMEMZERO((void FAR *) buffer, C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK)); 382793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler for (i = 0; i < C_MAX_BLOCKS_IN_MCU; i++) { 383793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler coef->dummy_buffer[i] = buffer + i; 384793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler } 385793ee12c6df9cad3806238d32528c49a3ff9331dNoah Presler} 386