Shoaib Ahmed / Mbed 2 deprecated uzairkhan

Final 350 project

Dependencies:   uzair Camera_LS_Y201 F7_Ethernet LCD_DISCO_F746NG NetworkAPI SDFileSystem mbed

includes/jctrans.c@0:791a779d6220, 2017-07-31 (annotated)

Committer:
shoaib_ahmed
Date:
Mon Jul 31 09:16:35 2017 +0000
Revision:
0:791a779d6220
final project;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
shoaib_ahmed 0:791a779d6220 1 /*
shoaib_ahmed 0:791a779d6220 2 * jctrans.c
shoaib_ahmed 0:791a779d6220 3 *
shoaib_ahmed 0:791a779d6220 4 * Copyright (C) 1995-1998, Thomas G. Lane.
shoaib_ahmed 0:791a779d6220 5 * Modified 2000-2013 by Guido Vollbeding.
shoaib_ahmed 0:791a779d6220 6 * This file is part of the Independent JPEG Group's software.
shoaib_ahmed 0:791a779d6220 7 * For conditions of distribution and use, see the accompanying README file.
shoaib_ahmed 0:791a779d6220 8 *
shoaib_ahmed 0:791a779d6220 9 * This file contains library routines for transcoding compression,
shoaib_ahmed 0:791a779d6220 10 * that is, writing raw DCT coefficient arrays to an output JPEG file.
shoaib_ahmed 0:791a779d6220 11 * The routines in jcapimin.c will also be needed by a transcoder.
shoaib_ahmed 0:791a779d6220 12 */
shoaib_ahmed 0:791a779d6220 13
shoaib_ahmed 0:791a779d6220 14 #define JPEG_INTERNALS
shoaib_ahmed 0:791a779d6220 15 #include "jinclude.h"
shoaib_ahmed 0:791a779d6220 16 #include "jpeglib.h"
shoaib_ahmed 0:791a779d6220 17
shoaib_ahmed 0:791a779d6220 18
shoaib_ahmed 0:791a779d6220 19 /* Forward declarations */
shoaib_ahmed 0:791a779d6220 20 LOCAL(void) transencode_master_selection
shoaib_ahmed 0:791a779d6220 21 JPP((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays));
shoaib_ahmed 0:791a779d6220 22 LOCAL(void) transencode_coef_controller
shoaib_ahmed 0:791a779d6220 23 JPP((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays));
shoaib_ahmed 0:791a779d6220 24
shoaib_ahmed 0:791a779d6220 25
shoaib_ahmed 0:791a779d6220 26 /*
shoaib_ahmed 0:791a779d6220 27 * Compression initialization for writing raw-coefficient data.
shoaib_ahmed 0:791a779d6220 28 * Before calling this, all parameters and a data destination must be set up.
shoaib_ahmed 0:791a779d6220 29 * Call jpeg_finish_compress() to actually write the data.
shoaib_ahmed 0:791a779d6220 30 *
shoaib_ahmed 0:791a779d6220 31 * The number of passed virtual arrays must match cinfo->num_components.
shoaib_ahmed 0:791a779d6220 32 * Note that the virtual arrays need not be filled or even realized at
shoaib_ahmed 0:791a779d6220 33 * the time write_coefficients is called; indeed, if the virtual arrays
shoaib_ahmed 0:791a779d6220 34 * were requested from this compression object's memory manager, they
shoaib_ahmed 0:791a779d6220 35 * typically will be realized during this routine and filled afterwards.
shoaib_ahmed 0:791a779d6220 36 */
shoaib_ahmed 0:791a779d6220 37
shoaib_ahmed 0:791a779d6220 38 GLOBAL(void)
shoaib_ahmed 0:791a779d6220 39 jpeg_write_coefficients (j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays)
shoaib_ahmed 0:791a779d6220 40 {
shoaib_ahmed 0:791a779d6220 41 if (cinfo->global_state != CSTATE_START)
shoaib_ahmed 0:791a779d6220 42 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
shoaib_ahmed 0:791a779d6220 43 /* Mark all tables to be written */
shoaib_ahmed 0:791a779d6220 44 jpeg_suppress_tables(cinfo, FALSE);
shoaib_ahmed 0:791a779d6220 45 /* (Re)initialize error mgr and destination modules */
shoaib_ahmed 0:791a779d6220 46 (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
shoaib_ahmed 0:791a779d6220 47 (*cinfo->dest->init_destination) (cinfo);
shoaib_ahmed 0:791a779d6220 48 /* Perform master selection of active modules */
shoaib_ahmed 0:791a779d6220 49 transencode_master_selection(cinfo, coef_arrays);
shoaib_ahmed 0:791a779d6220 50 /* Wait for jpeg_finish_compress() call */
shoaib_ahmed 0:791a779d6220 51 cinfo->next_scanline = 0; /* so jpeg_write_marker works */
shoaib_ahmed 0:791a779d6220 52 cinfo->global_state = CSTATE_WRCOEFS;
shoaib_ahmed 0:791a779d6220 53 }
shoaib_ahmed 0:791a779d6220 54
shoaib_ahmed 0:791a779d6220 55
shoaib_ahmed 0:791a779d6220 56 /*
shoaib_ahmed 0:791a779d6220 57 * Initialize the compression object with default parameters,
shoaib_ahmed 0:791a779d6220 58 * then copy from the source object all parameters needed for lossless
shoaib_ahmed 0:791a779d6220 59 * transcoding. Parameters that can be varied without loss (such as
shoaib_ahmed 0:791a779d6220 60 * scan script and Huffman optimization) are left in their default states.
shoaib_ahmed 0:791a779d6220 61 */
shoaib_ahmed 0:791a779d6220 62
shoaib_ahmed 0:791a779d6220 63 GLOBAL(void)
shoaib_ahmed 0:791a779d6220 64 jpeg_copy_critical_parameters (j_decompress_ptr srcinfo,
shoaib_ahmed 0:791a779d6220 65 j_compress_ptr dstinfo)
shoaib_ahmed 0:791a779d6220 66 {
shoaib_ahmed 0:791a779d6220 67 JQUANT_TBL ** qtblptr;
shoaib_ahmed 0:791a779d6220 68 jpeg_component_info *incomp, *outcomp;
shoaib_ahmed 0:791a779d6220 69 JQUANT_TBL *c_quant, *slot_quant;
shoaib_ahmed 0:791a779d6220 70 int tblno, ci, coefi;
shoaib_ahmed 0:791a779d6220 71
shoaib_ahmed 0:791a779d6220 72 /* Safety check to ensure start_compress not called yet. */
shoaib_ahmed 0:791a779d6220 73 if (dstinfo->global_state != CSTATE_START)
shoaib_ahmed 0:791a779d6220 74 ERREXIT1(dstinfo, JERR_BAD_STATE, dstinfo->global_state);
shoaib_ahmed 0:791a779d6220 75 /* Copy fundamental image dimensions */
shoaib_ahmed 0:791a779d6220 76 dstinfo->image_width = srcinfo->image_width;
shoaib_ahmed 0:791a779d6220 77 dstinfo->image_height = srcinfo->image_height;
shoaib_ahmed 0:791a779d6220 78 dstinfo->input_components = srcinfo->num_components;
shoaib_ahmed 0:791a779d6220 79 dstinfo->in_color_space = srcinfo->jpeg_color_space;
shoaib_ahmed 0:791a779d6220 80 dstinfo->jpeg_width = srcinfo->output_width;
shoaib_ahmed 0:791a779d6220 81 dstinfo->jpeg_height = srcinfo->output_height;
shoaib_ahmed 0:791a779d6220 82 dstinfo->min_DCT_h_scaled_size = srcinfo->min_DCT_h_scaled_size;
shoaib_ahmed 0:791a779d6220 83 dstinfo->min_DCT_v_scaled_size = srcinfo->min_DCT_v_scaled_size;
shoaib_ahmed 0:791a779d6220 84 /* Initialize all parameters to default values */
shoaib_ahmed 0:791a779d6220 85 jpeg_set_defaults(dstinfo);
shoaib_ahmed 0:791a779d6220 86 /* jpeg_set_defaults may choose wrong colorspace, eg YCbCr if input is RGB.
shoaib_ahmed 0:791a779d6220 87 * Fix it to get the right header markers for the image colorspace.
shoaib_ahmed 0:791a779d6220 88 * Note: Entropy table assignment in jpeg_set_colorspace depends
shoaib_ahmed 0:791a779d6220 89 * on color_transform.
shoaib_ahmed 0:791a779d6220 90 */
shoaib_ahmed 0:791a779d6220 91 dstinfo->color_transform = srcinfo->color_transform;
shoaib_ahmed 0:791a779d6220 92 jpeg_set_colorspace(dstinfo, srcinfo->jpeg_color_space);
shoaib_ahmed 0:791a779d6220 93 dstinfo->data_precision = srcinfo->data_precision;
shoaib_ahmed 0:791a779d6220 94 dstinfo->CCIR601_sampling = srcinfo->CCIR601_sampling;
shoaib_ahmed 0:791a779d6220 95 /* Copy the source's quantization tables. */
shoaib_ahmed 0:791a779d6220 96 for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) {
shoaib_ahmed 0:791a779d6220 97 if (srcinfo->quant_tbl_ptrs[tblno] != NULL) {
shoaib_ahmed 0:791a779d6220 98 qtblptr = & dstinfo->quant_tbl_ptrs[tblno];
shoaib_ahmed 0:791a779d6220 99 if (*qtblptr == NULL)
shoaib_ahmed 0:791a779d6220 100 *qtblptr = jpeg_alloc_quant_table((j_common_ptr) dstinfo);
shoaib_ahmed 0:791a779d6220 101 MEMCOPY((*qtblptr)->quantval,
shoaib_ahmed 0:791a779d6220 102 srcinfo->quant_tbl_ptrs[tblno]->quantval,
shoaib_ahmed 0:791a779d6220 103 SIZEOF((*qtblptr)->quantval));
shoaib_ahmed 0:791a779d6220 104 (*qtblptr)->sent_table = FALSE;
shoaib_ahmed 0:791a779d6220 105 }
shoaib_ahmed 0:791a779d6220 106 }
shoaib_ahmed 0:791a779d6220 107 /* Copy the source's per-component info.
shoaib_ahmed 0:791a779d6220 108 * Note we assume jpeg_set_defaults has allocated the dest comp_info array.
shoaib_ahmed 0:791a779d6220 109 */
shoaib_ahmed 0:791a779d6220 110 dstinfo->num_components = srcinfo->num_components;
shoaib_ahmed 0:791a779d6220 111 if (dstinfo->num_components < 1 || dstinfo->num_components > MAX_COMPONENTS)
shoaib_ahmed 0:791a779d6220 112 ERREXIT2(dstinfo, JERR_COMPONENT_COUNT, dstinfo->num_components,
shoaib_ahmed 0:791a779d6220 113 MAX_COMPONENTS);
shoaib_ahmed 0:791a779d6220 114 for (ci = 0, incomp = srcinfo->comp_info, outcomp = dstinfo->comp_info;
shoaib_ahmed 0:791a779d6220 115 ci < dstinfo->num_components; ci++, incomp++, outcomp++) {
shoaib_ahmed 0:791a779d6220 116 outcomp->component_id = incomp->component_id;
shoaib_ahmed 0:791a779d6220 117 outcomp->h_samp_factor = incomp->h_samp_factor;
shoaib_ahmed 0:791a779d6220 118 outcomp->v_samp_factor = incomp->v_samp_factor;
shoaib_ahmed 0:791a779d6220 119 outcomp->quant_tbl_no = incomp->quant_tbl_no;
shoaib_ahmed 0:791a779d6220 120 /* Make sure saved quantization table for component matches the qtable
shoaib_ahmed 0:791a779d6220 121 * slot. If not, the input file re-used this qtable slot.
shoaib_ahmed 0:791a779d6220 122 * IJG encoder currently cannot duplicate this.
shoaib_ahmed 0:791a779d6220 123 */
shoaib_ahmed 0:791a779d6220 124 tblno = outcomp->quant_tbl_no;
shoaib_ahmed 0:791a779d6220 125 if (tblno < 0 || tblno >= NUM_QUANT_TBLS ||
shoaib_ahmed 0:791a779d6220 126 srcinfo->quant_tbl_ptrs[tblno] == NULL)
shoaib_ahmed 0:791a779d6220 127 ERREXIT1(dstinfo, JERR_NO_QUANT_TABLE, tblno);
shoaib_ahmed 0:791a779d6220 128 slot_quant = srcinfo->quant_tbl_ptrs[tblno];
shoaib_ahmed 0:791a779d6220 129 c_quant = incomp->quant_table;
shoaib_ahmed 0:791a779d6220 130 if (c_quant != NULL) {
shoaib_ahmed 0:791a779d6220 131 for (coefi = 0; coefi < DCTSIZE2; coefi++) {
shoaib_ahmed 0:791a779d6220 132 if (c_quant->quantval[coefi] != slot_quant->quantval[coefi])
shoaib_ahmed 0:791a779d6220 133 ERREXIT1(dstinfo, JERR_MISMATCHED_QUANT_TABLE, tblno);
shoaib_ahmed 0:791a779d6220 134 }
shoaib_ahmed 0:791a779d6220 135 }
shoaib_ahmed 0:791a779d6220 136 /* Note: we do not copy the source's entropy table assignments;
shoaib_ahmed 0:791a779d6220 137 * instead we rely on jpeg_set_colorspace to have made a suitable choice.
shoaib_ahmed 0:791a779d6220 138 */
shoaib_ahmed 0:791a779d6220 139 }
shoaib_ahmed 0:791a779d6220 140 /* Also copy JFIF version and resolution information, if available.
shoaib_ahmed 0:791a779d6220 141 * Strictly speaking this isn't "critical" info, but it's nearly
shoaib_ahmed 0:791a779d6220 142 * always appropriate to copy it if available. In particular,
shoaib_ahmed 0:791a779d6220 143 * if the application chooses to copy JFIF 1.02 extension markers from
shoaib_ahmed 0:791a779d6220 144 * the source file, we need to copy the version to make sure we don't
shoaib_ahmed 0:791a779d6220 145 * emit a file that has 1.02 extensions but a claimed version of 1.01.
shoaib_ahmed 0:791a779d6220 146 */
shoaib_ahmed 0:791a779d6220 147 if (srcinfo->saw_JFIF_marker) {
shoaib_ahmed 0:791a779d6220 148 if (srcinfo->JFIF_major_version == 1 ||
shoaib_ahmed 0:791a779d6220 149 srcinfo->JFIF_major_version == 2) {
shoaib_ahmed 0:791a779d6220 150 dstinfo->JFIF_major_version = srcinfo->JFIF_major_version;
shoaib_ahmed 0:791a779d6220 151 dstinfo->JFIF_minor_version = srcinfo->JFIF_minor_version;
shoaib_ahmed 0:791a779d6220 152 }
shoaib_ahmed 0:791a779d6220 153 dstinfo->density_unit = srcinfo->density_unit;
shoaib_ahmed 0:791a779d6220 154 dstinfo->X_density = srcinfo->X_density;
shoaib_ahmed 0:791a779d6220 155 dstinfo->Y_density = srcinfo->Y_density;
shoaib_ahmed 0:791a779d6220 156 }
shoaib_ahmed 0:791a779d6220 157 }
shoaib_ahmed 0:791a779d6220 158
shoaib_ahmed 0:791a779d6220 159
shoaib_ahmed 0:791a779d6220 160 /*
shoaib_ahmed 0:791a779d6220 161 * Master selection of compression modules for transcoding.
shoaib_ahmed 0:791a779d6220 162 * This substitutes for jcinit.c's initialization of the full compressor.
shoaib_ahmed 0:791a779d6220 163 */
shoaib_ahmed 0:791a779d6220 164
shoaib_ahmed 0:791a779d6220 165 LOCAL(void)
shoaib_ahmed 0:791a779d6220 166 transencode_master_selection (j_compress_ptr cinfo,
shoaib_ahmed 0:791a779d6220 167 jvirt_barray_ptr * coef_arrays)
shoaib_ahmed 0:791a779d6220 168 {
shoaib_ahmed 0:791a779d6220 169 /* Initialize master control (includes parameter checking/processing) */
shoaib_ahmed 0:791a779d6220 170 jinit_c_master_control(cinfo, TRUE /* transcode only */);
shoaib_ahmed 0:791a779d6220 171
shoaib_ahmed 0:791a779d6220 172 /* Entropy encoding: either Huffman or arithmetic coding. */
shoaib_ahmed 0:791a779d6220 173 if (cinfo->arith_code)
shoaib_ahmed 0:791a779d6220 174 jinit_arith_encoder(cinfo);
shoaib_ahmed 0:791a779d6220 175 else {
shoaib_ahmed 0:791a779d6220 176 jinit_huff_encoder(cinfo);
shoaib_ahmed 0:791a779d6220 177 }
shoaib_ahmed 0:791a779d6220 178
shoaib_ahmed 0:791a779d6220 179 /* We need a special coefficient buffer controller. */
shoaib_ahmed 0:791a779d6220 180 transencode_coef_controller(cinfo, coef_arrays);
shoaib_ahmed 0:791a779d6220 181
shoaib_ahmed 0:791a779d6220 182 jinit_marker_writer(cinfo);
shoaib_ahmed 0:791a779d6220 183
shoaib_ahmed 0:791a779d6220 184 /* We can now tell the memory manager to allocate virtual arrays. */
shoaib_ahmed 0:791a779d6220 185 (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
shoaib_ahmed 0:791a779d6220 186
shoaib_ahmed 0:791a779d6220 187 /* Write the datastream header (SOI, JFIF) immediately.
shoaib_ahmed 0:791a779d6220 188 * Frame and scan headers are postponed till later.
shoaib_ahmed 0:791a779d6220 189 * This lets application insert special markers after the SOI.
shoaib_ahmed 0:791a779d6220 190 */
shoaib_ahmed 0:791a779d6220 191 (*cinfo->marker->write_file_header) (cinfo);
shoaib_ahmed 0:791a779d6220 192 }
shoaib_ahmed 0:791a779d6220 193
shoaib_ahmed 0:791a779d6220 194
shoaib_ahmed 0:791a779d6220 195 /*
shoaib_ahmed 0:791a779d6220 196 * The rest of this file is a special implementation of the coefficient
shoaib_ahmed 0:791a779d6220 197 * buffer controller. This is similar to jccoefct.c, but it handles only
shoaib_ahmed 0:791a779d6220 198 * output from presupplied virtual arrays. Furthermore, we generate any
shoaib_ahmed 0:791a779d6220 199 * dummy padding blocks on-the-fly rather than expecting them to be present
shoaib_ahmed 0:791a779d6220 200 * in the arrays.
shoaib_ahmed 0:791a779d6220 201 */
shoaib_ahmed 0:791a779d6220 202
shoaib_ahmed 0:791a779d6220 203 /* Private buffer controller object */
shoaib_ahmed 0:791a779d6220 204
shoaib_ahmed 0:791a779d6220 205 typedef struct {
shoaib_ahmed 0:791a779d6220 206 struct jpeg_c_coef_controller pub; /* public fields */
shoaib_ahmed 0:791a779d6220 207
shoaib_ahmed 0:791a779d6220 208 JDIMENSION iMCU_row_num; /* iMCU row # within image */
shoaib_ahmed 0:791a779d6220 209 JDIMENSION mcu_ctr; /* counts MCUs processed in current row */
shoaib_ahmed 0:791a779d6220 210 int MCU_vert_offset; /* counts MCU rows within iMCU row */
shoaib_ahmed 0:791a779d6220 211 int MCU_rows_per_iMCU_row; /* number of such rows needed */
shoaib_ahmed 0:791a779d6220 212
shoaib_ahmed 0:791a779d6220 213 /* Virtual block array for each component. */
shoaib_ahmed 0:791a779d6220 214 jvirt_barray_ptr * whole_image;
shoaib_ahmed 0:791a779d6220 215
shoaib_ahmed 0:791a779d6220 216 /* Workspace for constructing dummy blocks at right/bottom edges. */
shoaib_ahmed 0:791a779d6220 217 JBLOCKROW dummy_buffer[C_MAX_BLOCKS_IN_MCU];
shoaib_ahmed 0:791a779d6220 218 } my_coef_controller;
shoaib_ahmed 0:791a779d6220 219
shoaib_ahmed 0:791a779d6220 220 typedef my_coef_controller * my_coef_ptr;
shoaib_ahmed 0:791a779d6220 221
shoaib_ahmed 0:791a779d6220 222
shoaib_ahmed 0:791a779d6220 223 LOCAL(void)
shoaib_ahmed 0:791a779d6220 224 start_iMCU_row (j_compress_ptr cinfo)
shoaib_ahmed 0:791a779d6220 225 /* Reset within-iMCU-row counters for a new row */
shoaib_ahmed 0:791a779d6220 226 {
shoaib_ahmed 0:791a779d6220 227 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
shoaib_ahmed 0:791a779d6220 228
shoaib_ahmed 0:791a779d6220 229 /* In an interleaved scan, an MCU row is the same as an iMCU row.
shoaib_ahmed 0:791a779d6220 230 * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows.
shoaib_ahmed 0:791a779d6220 231 * But at the bottom of the image, process only what's left.
shoaib_ahmed 0:791a779d6220 232 */
shoaib_ahmed 0:791a779d6220 233 if (cinfo->comps_in_scan > 1) {
shoaib_ahmed 0:791a779d6220 234 coef->MCU_rows_per_iMCU_row = 1;
shoaib_ahmed 0:791a779d6220 235 } else {
shoaib_ahmed 0:791a779d6220 236 if (coef->iMCU_row_num < (cinfo->total_iMCU_rows-1))
shoaib_ahmed 0:791a779d6220 237 coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor;
shoaib_ahmed 0:791a779d6220 238 else
shoaib_ahmed 0:791a779d6220 239 coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height;
shoaib_ahmed 0:791a779d6220 240 }
shoaib_ahmed 0:791a779d6220 241
shoaib_ahmed 0:791a779d6220 242 coef->mcu_ctr = 0;
shoaib_ahmed 0:791a779d6220 243 coef->MCU_vert_offset = 0;
shoaib_ahmed 0:791a779d6220 244 }
shoaib_ahmed 0:791a779d6220 245
shoaib_ahmed 0:791a779d6220 246
shoaib_ahmed 0:791a779d6220 247 /*
shoaib_ahmed 0:791a779d6220 248 * Initialize for a processing pass.
shoaib_ahmed 0:791a779d6220 249 */
shoaib_ahmed 0:791a779d6220 250
shoaib_ahmed 0:791a779d6220 251 METHODDEF(void)
shoaib_ahmed 0:791a779d6220 252 start_pass_coef (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
shoaib_ahmed 0:791a779d6220 253 {
shoaib_ahmed 0:791a779d6220 254 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
shoaib_ahmed 0:791a779d6220 255
shoaib_ahmed 0:791a779d6220 256 if (pass_mode != JBUF_CRANK_DEST)
shoaib_ahmed 0:791a779d6220 257 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
shoaib_ahmed 0:791a779d6220 258
shoaib_ahmed 0:791a779d6220 259 coef->iMCU_row_num = 0;
shoaib_ahmed 0:791a779d6220 260 start_iMCU_row(cinfo);
shoaib_ahmed 0:791a779d6220 261 }
shoaib_ahmed 0:791a779d6220 262
shoaib_ahmed 0:791a779d6220 263
shoaib_ahmed 0:791a779d6220 264 /*
shoaib_ahmed 0:791a779d6220 265 * Process some data.
shoaib_ahmed 0:791a779d6220 266 * We process the equivalent of one fully interleaved MCU row ("iMCU" row)
shoaib_ahmed 0:791a779d6220 267 * per call, ie, v_samp_factor block rows for each component in the scan.
shoaib_ahmed 0:791a779d6220 268 * The data is obtained from the virtual arrays and fed to the entropy coder.
shoaib_ahmed 0:791a779d6220 269 * Returns TRUE if the iMCU row is completed, FALSE if suspended.
shoaib_ahmed 0:791a779d6220 270 *
shoaib_ahmed 0:791a779d6220 271 * NB: input_buf is ignored; it is likely to be a NULL pointer.
shoaib_ahmed 0:791a779d6220 272 */
shoaib_ahmed 0:791a779d6220 273
shoaib_ahmed 0:791a779d6220 274 METHODDEF(boolean)
shoaib_ahmed 0:791a779d6220 275 compress_output (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
shoaib_ahmed 0:791a779d6220 276 {
shoaib_ahmed 0:791a779d6220 277 my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
shoaib_ahmed 0:791a779d6220 278 JDIMENSION MCU_col_num; /* index of current MCU within row */
shoaib_ahmed 0:791a779d6220 279 JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1;
shoaib_ahmed 0:791a779d6220 280 JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
shoaib_ahmed 0:791a779d6220 281 int blkn, ci, xindex, yindex, yoffset, blockcnt;
shoaib_ahmed 0:791a779d6220 282 JDIMENSION start_col;
shoaib_ahmed 0:791a779d6220 283 JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN];
shoaib_ahmed 0:791a779d6220 284 JBLOCKROW MCU_buffer[C_MAX_BLOCKS_IN_MCU];
shoaib_ahmed 0:791a779d6220 285 JBLOCKROW buffer_ptr;
shoaib_ahmed 0:791a779d6220 286 jpeg_component_info *compptr;
shoaib_ahmed 0:791a779d6220 287
shoaib_ahmed 0:791a779d6220 288 /* Align the virtual buffers for the components used in this scan. */
shoaib_ahmed 0:791a779d6220 289 for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
shoaib_ahmed 0:791a779d6220 290 compptr = cinfo->cur_comp_info[ci];
shoaib_ahmed 0:791a779d6220 291 buffer[ci] = (*cinfo->mem->access_virt_barray)
shoaib_ahmed 0:791a779d6220 292 ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index],
shoaib_ahmed 0:791a779d6220 293 coef->iMCU_row_num * compptr->v_samp_factor,
shoaib_ahmed 0:791a779d6220 294 (JDIMENSION) compptr->v_samp_factor, FALSE);
shoaib_ahmed 0:791a779d6220 295 }
shoaib_ahmed 0:791a779d6220 296
shoaib_ahmed 0:791a779d6220 297 /* Loop to process one whole iMCU row */
shoaib_ahmed 0:791a779d6220 298 for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
shoaib_ahmed 0:791a779d6220 299 yoffset++) {
shoaib_ahmed 0:791a779d6220 300 for (MCU_col_num = coef->mcu_ctr; MCU_col_num < cinfo->MCUs_per_row;
shoaib_ahmed 0:791a779d6220 301 MCU_col_num++) {
shoaib_ahmed 0:791a779d6220 302 /* Construct list of pointers to DCT blocks belonging to this MCU */
shoaib_ahmed 0:791a779d6220 303 blkn = 0; /* index of current DCT block within MCU */
shoaib_ahmed 0:791a779d6220 304 for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
shoaib_ahmed 0:791a779d6220 305 compptr = cinfo->cur_comp_info[ci];
shoaib_ahmed 0:791a779d6220 306 start_col = MCU_col_num * compptr->MCU_width;
shoaib_ahmed 0:791a779d6220 307 blockcnt = (MCU_col_num < last_MCU_col) ? compptr->MCU_width
shoaib_ahmed 0:791a779d6220 308 : compptr->last_col_width;
shoaib_ahmed 0:791a779d6220 309 for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
shoaib_ahmed 0:791a779d6220 310 if (coef->iMCU_row_num < last_iMCU_row ||
shoaib_ahmed 0:791a779d6220 311 yindex+yoffset < compptr->last_row_height) {
shoaib_ahmed 0:791a779d6220 312 /* Fill in pointers to real blocks in this row */
shoaib_ahmed 0:791a779d6220 313 buffer_ptr = buffer[ci][yindex+yoffset] + start_col;
shoaib_ahmed 0:791a779d6220 314 for (xindex = 0; xindex < blockcnt; xindex++)
shoaib_ahmed 0:791a779d6220 315 MCU_buffer[blkn++] = buffer_ptr++;
shoaib_ahmed 0:791a779d6220 316 } else {
shoaib_ahmed 0:791a779d6220 317 /* At bottom of image, need a whole row of dummy blocks */
shoaib_ahmed 0:791a779d6220 318 xindex = 0;
shoaib_ahmed 0:791a779d6220 319 }
shoaib_ahmed 0:791a779d6220 320 /* Fill in any dummy blocks needed in this row.
shoaib_ahmed 0:791a779d6220 321 * Dummy blocks are filled in the same way as in jccoefct.c:
shoaib_ahmed 0:791a779d6220 322 * all zeroes in the AC entries, DC entries equal to previous
shoaib_ahmed 0:791a779d6220 323 * block's DC value. The init routine has already zeroed the
shoaib_ahmed 0:791a779d6220 324 * AC entries, so we need only set the DC entries correctly.
shoaib_ahmed 0:791a779d6220 325 */
shoaib_ahmed 0:791a779d6220 326 for (; xindex < compptr->MCU_width; xindex++) {
shoaib_ahmed 0:791a779d6220 327 MCU_buffer[blkn] = coef->dummy_buffer[blkn];
shoaib_ahmed 0:791a779d6220 328 MCU_buffer[blkn][0][0] = MCU_buffer[blkn-1][0][0];
shoaib_ahmed 0:791a779d6220 329 blkn++;
shoaib_ahmed 0:791a779d6220 330 }
shoaib_ahmed 0:791a779d6220 331 }
shoaib_ahmed 0:791a779d6220 332 }
shoaib_ahmed 0:791a779d6220 333 /* Try to write the MCU. */
shoaib_ahmed 0:791a779d6220 334 if (! (*cinfo->entropy->encode_mcu) (cinfo, MCU_buffer)) {
shoaib_ahmed 0:791a779d6220 335 /* Suspension forced; update state counters and exit */
shoaib_ahmed 0:791a779d6220 336 coef->MCU_vert_offset = yoffset;
shoaib_ahmed 0:791a779d6220 337 coef->mcu_ctr = MCU_col_num;
shoaib_ahmed 0:791a779d6220 338 return FALSE;
shoaib_ahmed 0:791a779d6220 339 }
shoaib_ahmed 0:791a779d6220 340 }
shoaib_ahmed 0:791a779d6220 341 /* Completed an MCU row, but perhaps not an iMCU row */
shoaib_ahmed 0:791a779d6220 342 coef->mcu_ctr = 0;
shoaib_ahmed 0:791a779d6220 343 }
shoaib_ahmed 0:791a779d6220 344 /* Completed the iMCU row, advance counters for next one */
shoaib_ahmed 0:791a779d6220 345 coef->iMCU_row_num++;
shoaib_ahmed 0:791a779d6220 346 start_iMCU_row(cinfo);
shoaib_ahmed 0:791a779d6220 347 return TRUE;
shoaib_ahmed 0:791a779d6220 348 }
shoaib_ahmed 0:791a779d6220 349
shoaib_ahmed 0:791a779d6220 350
shoaib_ahmed 0:791a779d6220 351 /*
shoaib_ahmed 0:791a779d6220 352 * Initialize coefficient buffer controller.
shoaib_ahmed 0:791a779d6220 353 *
shoaib_ahmed 0:791a779d6220 354 * Each passed coefficient array must be the right size for that
shoaib_ahmed 0:791a779d6220 355 * coefficient: width_in_blocks wide and height_in_blocks high,
shoaib_ahmed 0:791a779d6220 356 * with unitheight at least v_samp_factor.
shoaib_ahmed 0:791a779d6220 357 */
shoaib_ahmed 0:791a779d6220 358
shoaib_ahmed 0:791a779d6220 359 LOCAL(void)
shoaib_ahmed 0:791a779d6220 360 transencode_coef_controller (j_compress_ptr cinfo,
shoaib_ahmed 0:791a779d6220 361 jvirt_barray_ptr * coef_arrays)
shoaib_ahmed 0:791a779d6220 362 {
shoaib_ahmed 0:791a779d6220 363 my_coef_ptr coef;
shoaib_ahmed 0:791a779d6220 364 JBLOCKROW buffer;
shoaib_ahmed 0:791a779d6220 365 int i;
shoaib_ahmed 0:791a779d6220 366
shoaib_ahmed 0:791a779d6220 367 coef = (my_coef_ptr)
shoaib_ahmed 0:791a779d6220 368 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
shoaib_ahmed 0:791a779d6220 369 SIZEOF(my_coef_controller));
shoaib_ahmed 0:791a779d6220 370 cinfo->coef = &coef->pub;
shoaib_ahmed 0:791a779d6220 371 coef->pub.start_pass = start_pass_coef;
shoaib_ahmed 0:791a779d6220 372 coef->pub.compress_data = compress_output;
shoaib_ahmed 0:791a779d6220 373
shoaib_ahmed 0:791a779d6220 374 /* Save pointer to virtual arrays */
shoaib_ahmed 0:791a779d6220 375 coef->whole_image = coef_arrays;
shoaib_ahmed 0:791a779d6220 376
shoaib_ahmed 0:791a779d6220 377 /* Allocate and pre-zero space for dummy DCT blocks. */
shoaib_ahmed 0:791a779d6220 378 buffer = (JBLOCKROW)
shoaib_ahmed 0:791a779d6220 379 (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
shoaib_ahmed 0:791a779d6220 380 C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK));
shoaib_ahmed 0:791a779d6220 381 FMEMZERO((void FAR *) buffer, C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK));
shoaib_ahmed 0:791a779d6220 382 for (i = 0; i < C_MAX_BLOCKS_IN_MCU; i++) {
shoaib_ahmed 0:791a779d6220 383 coef->dummy_buffer[i] = buffer + i;
shoaib_ahmed 0:791a779d6220 384 }
shoaib_ahmed 0:791a779d6220 385 }