Doxygen Source Code Documentation
jctrans.c File Reference
#include "jinclude.h"
#include "jpeglib.h"
Go to the source code of this file.
Data Structures | |
struct | my_coef_controller |
Defines | |
#define | JPEG_INTERNALS |
Typedefs | |
typedef my_coef_controller * | my_coef_ptr |
Functions | |
LOCAL (void) transencode_master_selection JPP((j_compress_ptr cinfo | |
jpeg_write_coefficients (j_compress_ptr cinfo, jvirt_barray_ptr *coef_arrays) | |
jpeg_copy_critical_parameters (j_decompress_ptr srcinfo, j_compress_ptr dstinfo) | |
transencode_master_selection (j_compress_ptr cinfo, jvirt_barray_ptr *coef_arrays) | |
start_iMCU_row (j_compress_ptr cinfo) | |
start_pass_coef (j_compress_ptr cinfo, J_BUF_MODE pass_mode) | |
compress_output (j_compress_ptr cinfo, JSAMPIMAGE input_buf) | |
transencode_coef_controller (j_compress_ptr cinfo, jvirt_barray_ptr *coef_arrays) | |
Variables | |
jvirt_barray_ptr * | coef_arrays |
Define Documentation
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Typedef Documentation
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Function Documentation
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Definition at line 278 of file jctrans.c. References C_MAX_BLOCKS_IN_MCU, jpeg_compress_struct::coef, jpeg_component_info::component_index, compptr, jpeg_compress_struct::comps_in_scan, jpeg_compress_struct::cur_comp_info, my_coef_controller::dummy_buffer, jpeg_compress_struct::entropy, my_coef_controller::iMCU_row_num, JBLOCKARRAY, JBLOCKROW, JDIMENSION, JSAMPIMAGE, jpeg_component_info::last_col_width, jpeg_component_info::last_row_height, MAX_COMPS_IN_SCAN, my_coef_controller::mcu_ctr, jpeg_component_info::MCU_height, my_coef_controller::MCU_rows_per_iMCU_row, my_coef_controller::MCU_vert_offset, jpeg_component_info::MCU_width, jpeg_compress_struct::MCUs_per_row, start_iMCU_row(), jpeg_compress_struct::total_iMCU_rows, jpeg_component_info::v_samp_factor, and my_coef_controller::whole_image. Referenced by compress_first_pass(), and transencode_coef_controller().
00279 { 00280 my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 00281 JDIMENSION MCU_col_num; /* index of current MCU within row */ 00282 JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1; 00283 JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1; 00284 int blkn, ci, xindex, yindex, yoffset, blockcnt; 00285 JDIMENSION start_col; 00286 JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN]; 00287 JBLOCKROW MCU_buffer[C_MAX_BLOCKS_IN_MCU]; 00288 JBLOCKROW buffer_ptr; 00289 jpeg_component_info *compptr; 00290 00291 /* Align the virtual buffers for the components used in this scan. */ 00292 for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 00293 compptr = cinfo->cur_comp_info[ci]; 00294 buffer[ci] = (*cinfo->mem->access_virt_barray) 00295 ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index], 00296 coef->iMCU_row_num * compptr->v_samp_factor, 00297 (JDIMENSION) compptr->v_samp_factor, FALSE); 00298 } 00299 00300 /* Loop to process one whole iMCU row */ 00301 for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row; 00302 yoffset++) { 00303 for (MCU_col_num = coef->mcu_ctr; MCU_col_num < cinfo->MCUs_per_row; 00304 MCU_col_num++) { 00305 /* Construct list of pointers to DCT blocks belonging to this MCU */ 00306 blkn = 0; /* index of current DCT block within MCU */ 00307 for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 00308 compptr = cinfo->cur_comp_info[ci]; 00309 start_col = MCU_col_num * compptr->MCU_width; 00310 blockcnt = (MCU_col_num < last_MCU_col) ? compptr->MCU_width 00311 : compptr->last_col_width; 00312 for (yindex = 0; yindex < compptr->MCU_height; yindex++) { 00313 if (coef->iMCU_row_num < last_iMCU_row || 00314 yindex+yoffset < compptr->last_row_height) { 00315 /* Fill in pointers to real blocks in this row */ 00316 buffer_ptr = buffer[ci][yindex+yoffset] + start_col; 00317 for (xindex = 0; xindex < blockcnt; xindex++) 00318 MCU_buffer[blkn++] = buffer_ptr++; 00319 } else { 00320 /* At bottom of image, need a whole row of dummy blocks */ 00321 xindex = 0; 00322 } 00323 /* Fill in any dummy blocks needed in this row. 00324 * Dummy blocks are filled in the same way as in jccoefct.c: 00325 * all zeroes in the AC entries, DC entries equal to previous 00326 * block's DC value. The init routine has already zeroed the 00327 * AC entries, so we need only set the DC entries correctly. 00328 */ 00329 for (; xindex < compptr->MCU_width; xindex++) { 00330 MCU_buffer[blkn] = coef->dummy_buffer[blkn]; 00331 MCU_buffer[blkn][0][0] = MCU_buffer[blkn-1][0][0]; 00332 blkn++; 00333 } 00334 } 00335 } 00336 /* Try to write the MCU. */ 00337 if (! (*cinfo->entropy->encode_mcu) (cinfo, MCU_buffer)) { 00338 /* Suspension forced; update state counters and exit */ 00339 coef->MCU_vert_offset = yoffset; 00340 coef->mcu_ctr = MCU_col_num; 00341 return FALSE; 00342 } 00343 } 00344 /* Completed an MCU row, but perhaps not an iMCU row */ 00345 coef->mcu_ctr = 0; 00346 } 00347 /* Completed the iMCU row, advance counters for next one */ 00348 coef->iMCU_row_num++; 00349 start_iMCU_row(cinfo); 00350 return TRUE; 00351 } |
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Definition at line 63 of file jctrans.c. References jpeg_decompress_struct::CCIR601_sampling, jpeg_compress_struct::CCIR601_sampling, jpeg_compress_struct::comp_info, jpeg_decompress_struct::comp_info, jpeg_component_info::component_id, CSTATE_START, jpeg_decompress_struct::data_precision, jpeg_compress_struct::data_precision, jpeg_decompress_struct::density_unit, jpeg_compress_struct::density_unit, ERREXIT1, ERREXIT2, jpeg_component_info::h_samp_factor, jpeg_decompress_struct::image_height, jpeg_compress_struct::image_height, jpeg_decompress_struct::image_width, jpeg_compress_struct::image_width, jpeg_compress_struct::in_color_space, jpeg_compress_struct::input_components, JERR_MISMATCHED_QUANT_TABLE, jpeg_compress_struct::JFIF_major_version, jpeg_decompress_struct::JFIF_major_version, jpeg_decompress_struct::JFIF_minor_version, jpeg_compress_struct::JFIF_minor_version, jpeg_alloc_quant_table(), jpeg_decompress_struct::jpeg_color_space, jpeg_set_colorspace(), jpeg_set_defaults(), MAX_COMPONENTS, MEMCOPY, jpeg_compress_struct::num_components, jpeg_decompress_struct::num_components, NUM_QUANT_TBLS, jpeg_component_info::quant_table, jpeg_component_info::quant_tbl_no, jpeg_compress_struct::quant_tbl_ptrs, jpeg_decompress_struct::quant_tbl_ptrs, JQUANT_TBL::quantval, jpeg_decompress_struct::saw_JFIF_marker, SIZEOF, jpeg_component_info::v_samp_factor, jpeg_decompress_struct::X_density, jpeg_compress_struct::X_density, jpeg_decompress_struct::Y_density, and jpeg_compress_struct::Y_density. Referenced by main().
00065 { 00066 JQUANT_TBL ** qtblptr; 00067 jpeg_component_info *incomp, *outcomp; 00068 JQUANT_TBL *c_quant, *slot_quant; 00069 int tblno, ci, coefi; 00070 00071 /* Safety check to ensure start_compress not called yet. */ 00072 if (dstinfo->global_state != CSTATE_START) 00073 ERREXIT1(dstinfo, JERR_BAD_STATE, dstinfo->global_state); 00074 /* Copy fundamental image dimensions */ 00075 dstinfo->image_width = srcinfo->image_width; 00076 dstinfo->image_height = srcinfo->image_height; 00077 dstinfo->input_components = srcinfo->num_components; 00078 dstinfo->in_color_space = srcinfo->jpeg_color_space; 00079 /* Initialize all parameters to default values */ 00080 jpeg_set_defaults(dstinfo); 00081 /* jpeg_set_defaults may choose wrong colorspace, eg YCbCr if input is RGB. 00082 * Fix it to get the right header markers for the image colorspace. 00083 */ 00084 jpeg_set_colorspace(dstinfo, srcinfo->jpeg_color_space); 00085 dstinfo->data_precision = srcinfo->data_precision; 00086 dstinfo->CCIR601_sampling = srcinfo->CCIR601_sampling; 00087 /* Copy the source's quantization tables. */ 00088 for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) { 00089 if (srcinfo->quant_tbl_ptrs[tblno] != NULL) { 00090 qtblptr = & dstinfo->quant_tbl_ptrs[tblno]; 00091 if (*qtblptr == NULL) 00092 *qtblptr = jpeg_alloc_quant_table((j_common_ptr) dstinfo); 00093 MEMCOPY((*qtblptr)->quantval, 00094 srcinfo->quant_tbl_ptrs[tblno]->quantval, 00095 SIZEOF((*qtblptr)->quantval)); 00096 (*qtblptr)->sent_table = FALSE; 00097 } 00098 } 00099 /* Copy the source's per-component info. 00100 * Note we assume jpeg_set_defaults has allocated the dest comp_info array. 00101 */ 00102 dstinfo->num_components = srcinfo->num_components; 00103 if (dstinfo->num_components < 1 || dstinfo->num_components > MAX_COMPONENTS) 00104 ERREXIT2(dstinfo, JERR_COMPONENT_COUNT, dstinfo->num_components, 00105 MAX_COMPONENTS); 00106 for (ci = 0, incomp = srcinfo->comp_info, outcomp = dstinfo->comp_info; 00107 ci < dstinfo->num_components; ci++, incomp++, outcomp++) { 00108 outcomp->component_id = incomp->component_id; 00109 outcomp->h_samp_factor = incomp->h_samp_factor; 00110 outcomp->v_samp_factor = incomp->v_samp_factor; 00111 outcomp->quant_tbl_no = incomp->quant_tbl_no; 00112 /* Make sure saved quantization table for component matches the qtable 00113 * slot. If not, the input file re-used this qtable slot. 00114 * IJG encoder currently cannot duplicate this. 00115 */ 00116 tblno = outcomp->quant_tbl_no; 00117 if (tblno < 0 || tblno >= NUM_QUANT_TBLS || 00118 srcinfo->quant_tbl_ptrs[tblno] == NULL) 00119 ERREXIT1(dstinfo, JERR_NO_QUANT_TABLE, tblno); 00120 slot_quant = srcinfo->quant_tbl_ptrs[tblno]; 00121 c_quant = incomp->quant_table; 00122 if (c_quant != NULL) { 00123 for (coefi = 0; coefi < DCTSIZE2; coefi++) { 00124 if (c_quant->quantval[coefi] != slot_quant->quantval[coefi]) 00125 ERREXIT1(dstinfo, JERR_MISMATCHED_QUANT_TABLE, tblno); 00126 } 00127 } 00128 /* Note: we do not copy the source's Huffman table assignments; 00129 * instead we rely on jpeg_set_colorspace to have made a suitable choice. 00130 */ 00131 } 00132 /* Also copy JFIF version and resolution information, if available. 00133 * Strictly speaking this isn't "critical" info, but it's nearly 00134 * always appropriate to copy it if available. In particular, 00135 * if the application chooses to copy JFIF 1.02 extension markers from 00136 * the source file, we need to copy the version to make sure we don't 00137 * emit a file that has 1.02 extensions but a claimed version of 1.01. 00138 * We will *not*, however, copy version info from mislabeled "2.01" files. 00139 */ 00140 if (srcinfo->saw_JFIF_marker) { 00141 if (srcinfo->JFIF_major_version == 1) { 00142 dstinfo->JFIF_major_version = srcinfo->JFIF_major_version; 00143 dstinfo->JFIF_minor_version = srcinfo->JFIF_minor_version; 00144 } 00145 dstinfo->density_unit = srcinfo->density_unit; 00146 dstinfo->X_density = srcinfo->X_density; 00147 dstinfo->Y_density = srcinfo->Y_density; 00148 } 00149 } |
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Definition at line 38 of file jctrans.c. References coef_arrays, CSTATE_START, CSTATE_WRCOEFS, jpeg_compress_struct::dest, ERREXIT1, jpeg_suppress_tables(), jpeg_compress_struct::next_scanline, and transencode_master_selection(). Referenced by main().
00039 { 00040 if (cinfo->global_state != CSTATE_START) 00041 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 00042 /* Mark all tables to be written */ 00043 jpeg_suppress_tables(cinfo, FALSE); 00044 /* (Re)initialize error mgr and destination modules */ 00045 (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo); 00046 (*cinfo->dest->init_destination) (cinfo); 00047 /* Perform master selection of active modules */ 00048 transencode_master_selection(cinfo, coef_arrays); 00049 /* Wait for jpeg_finish_compress() call */ 00050 cinfo->next_scanline = 0; /* so jpeg_write_marker works */ 00051 cinfo->global_state = CSTATE_WRCOEFS; 00052 } |
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Definition at line 227 of file jctrans.c. References jpeg_compress_struct::coef, jpeg_compress_struct::comps_in_scan, jpeg_compress_struct::cur_comp_info, my_coef_controller::iMCU_row_num, jpeg_component_info::last_row_height, my_coef_controller::mcu_ctr, my_coef_controller::MCU_rows_per_iMCU_row, my_coef_controller::MCU_vert_offset, jpeg_compress_struct::total_iMCU_rows, and jpeg_component_info::v_samp_factor.
00229 { 00230 my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 00231 00232 /* In an interleaved scan, an MCU row is the same as an iMCU row. 00233 * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows. 00234 * But at the bottom of the image, process only what's left. 00235 */ 00236 if (cinfo->comps_in_scan > 1) { 00237 coef->MCU_rows_per_iMCU_row = 1; 00238 } else { 00239 if (coef->iMCU_row_num < (cinfo->total_iMCU_rows-1)) 00240 coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor; 00241 else 00242 coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height; 00243 } 00244 00245 coef->mcu_ctr = 0; 00246 coef->MCU_vert_offset = 0; 00247 } |
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Definition at line 255 of file jctrans.c. References jpeg_compress_struct::coef, ERREXIT, my_coef_controller::iMCU_row_num, J_BUF_MODE, JBUF_CRANK_DEST, and start_iMCU_row(). Referenced by transencode_coef_controller().
00256 { 00257 my_coef_ptr coef = (my_coef_ptr) cinfo->coef; 00258 00259 if (pass_mode != JBUF_CRANK_DEST) 00260 ERREXIT(cinfo, JERR_BAD_BUFFER_MODE); 00261 00262 coef->iMCU_row_num = 0; 00263 start_iMCU_row(cinfo); 00264 } |
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Definition at line 363 of file jctrans.c. References C_MAX_BLOCKS_IN_MCU, coef_arrays, compress_output(), i, JBLOCK, JBLOCKROW, JPOOL_IMAGE, jzero_far(), SIZEOF, and start_pass_coef(). Referenced by transencode_master_selection().
00365 { 00366 my_coef_ptr coef; 00367 JBLOCKROW buffer; 00368 int i; 00369 00370 coef = (my_coef_ptr) 00371 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 00372 SIZEOF(my_coef_controller)); 00373 cinfo->coef = (struct jpeg_c_coef_controller *) coef; 00374 coef->pub.start_pass = start_pass_coef; 00375 coef->pub.compress_data = compress_output; 00376 00377 /* Save pointer to virtual arrays */ 00378 coef->whole_image = coef_arrays; 00379 00380 /* Allocate and pre-zero space for dummy DCT blocks. */ 00381 buffer = (JBLOCKROW) 00382 (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE, 00383 C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK)); 00384 jzero_far((void FAR *) buffer, C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK)); 00385 for (i = 0; i < C_MAX_BLOCKS_IN_MCU; i++) { 00386 coef->dummy_buffer[i] = buffer + i; 00387 } 00388 } |
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Definition at line 158 of file jctrans.c. References jpeg_compress_struct::arith_code, coef_arrays, ERREXIT, jpeg_compress_struct::input_components, JERR_ARITH_NOTIMPL, jinit_c_master_control(), jinit_huff_encoder(), jinit_marker_writer(), jinit_phuff_encoder(), jpeg_compress_struct::marker, jpeg_compress_struct::progressive_mode, and transencode_coef_controller(). Referenced by jpeg_write_coefficients().
00160 { 00161 /* Although we don't actually use input_components for transcoding, 00162 * jcmaster.c's initial_setup will complain if input_components is 0. 00163 */ 00164 cinfo->input_components = 1; 00165 /* Initialize master control (includes parameter checking/processing) */ 00166 jinit_c_master_control(cinfo, TRUE /* transcode only */); 00167 00168 /* Entropy encoding: either Huffman or arithmetic coding. */ 00169 if (cinfo->arith_code) { 00170 ERREXIT(cinfo, JERR_ARITH_NOTIMPL); 00171 } else { 00172 if (cinfo->progressive_mode) { 00173 #ifdef C_PROGRESSIVE_SUPPORTED 00174 jinit_phuff_encoder(cinfo); 00175 #else 00176 ERREXIT(cinfo, JERR_NOT_COMPILED); 00177 #endif 00178 } else 00179 jinit_huff_encoder(cinfo); 00180 } 00181 00182 /* We need a special coefficient buffer controller. */ 00183 transencode_coef_controller(cinfo, coef_arrays); 00184 00185 jinit_marker_writer(cinfo); 00186 00187 /* We can now tell the memory manager to allocate virtual arrays. */ 00188 (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo); 00189 00190 /* Write the datastream header (SOI, JFIF) immediately. 00191 * Frame and scan headers are postponed till later. 00192 * This lets application insert special markers after the SOI. 00193 */ 00194 (*cinfo->marker->write_file_header) (cinfo); 00195 } |
Variable Documentation
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Definition at line 22 of file jctrans.c. Referenced by jpeg_write_coefficients(), transencode_coef_controller(), and transencode_master_selection(). |