+++ /dev/null
-/*
- * jctrans.c
- *
- * Copyright (C) 1995-1998, Thomas G. Lane.
- * This file is part of the Independent JPEG Group's software.
- * For conditions of distribution and use, see the accompanying README file.
- *
- * This file contains library routines for transcoding compression,
- * that is, writing raw DCT coefficient arrays to an output JPEG file.
- * The routines in jcapimin.c will also be needed by a transcoder.
- */
-
-#define JPEG_INTERNALS
-#include "jinclude.h"
-#include "jpeglib.h"
-
-
-/* Forward declarations */
-LOCAL(void) transencode_master_selection
- JPP((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays));
-LOCAL(void) transencode_coef_controller
- JPP((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays));
-
-
-/*
- * Compression initialization for writing raw-coefficient data.
- * Before calling this, all parameters and a data destination must be set up.
- * Call jpeg_finish_compress() to actually write the data.
- *
- * The number of passed virtual arrays must match cinfo->num_components.
- * Note that the virtual arrays need not be filled or even realized at
- * the time write_coefficients is called; indeed, if the virtual arrays
- * were requested from this compression object's memory manager, they
- * typically will be realized during this routine and filled afterwards.
- */
-
-GLOBAL(void)
-jpeg_write_coefficients (j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays)
-{
- if (cinfo->global_state != CSTATE_START)
- ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
- /* Mark all tables to be written */
- jpeg_suppress_tables(cinfo, FALSE);
- /* (Re)initialize error mgr and destination modules */
- (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
- (*cinfo->dest->init_destination) (cinfo);
- /* Perform master selection of active modules */
- transencode_master_selection(cinfo, coef_arrays);
- /* Wait for jpeg_finish_compress() call */
- cinfo->next_scanline = 0; /* so jpeg_write_marker works */
- cinfo->global_state = CSTATE_WRCOEFS;
-}
-
-
-/*
- * Initialize the compression object with default parameters,
- * then copy from the source object all parameters needed for lossless
- * transcoding. Parameters that can be varied without loss (such as
- * scan script and Huffman optimization) are left in their default states.
- */
-
-GLOBAL(void)
-jpeg_copy_critical_parameters (j_decompress_ptr srcinfo,
- j_compress_ptr dstinfo)
-{
- JQUANT_TBL ** qtblptr;
- jpeg_component_info *incomp, *outcomp;
- JQUANT_TBL *c_quant, *slot_quant;
- int tblno, ci, coefi;
-
- /* Safety check to ensure start_compress not called yet. */
- if (dstinfo->global_state != CSTATE_START)
- ERREXIT1(dstinfo, JERR_BAD_STATE, dstinfo->global_state);
- /* Copy fundamental image dimensions */
- dstinfo->image_width = srcinfo->image_width;
- dstinfo->image_height = srcinfo->image_height;
- dstinfo->input_components = srcinfo->num_components;
- dstinfo->in_color_space = srcinfo->jpeg_color_space;
- /* Initialize all parameters to default values */
- jpeg_set_defaults(dstinfo);
- /* jpeg_set_defaults may choose wrong colorspace, eg YCbCr if input is RGB.
- * Fix it to get the right header markers for the image colorspace.
- */
- jpeg_set_colorspace(dstinfo, srcinfo->jpeg_color_space);
- dstinfo->data_precision = srcinfo->data_precision;
- dstinfo->CCIR601_sampling = srcinfo->CCIR601_sampling;
- /* Copy the source's quantization tables. */
- for (tblno = 0; tblno < NUM_QUANT_TBLS; tblno++) {
- if (srcinfo->quant_tbl_ptrs[tblno] != NULL) {
- qtblptr = & dstinfo->quant_tbl_ptrs[tblno];
- if (*qtblptr == NULL)
- *qtblptr = jpeg_alloc_quant_table((j_common_ptr) dstinfo);
- MEMCOPY((*qtblptr)->quantval,
- srcinfo->quant_tbl_ptrs[tblno]->quantval,
- SIZEOF((*qtblptr)->quantval));
- (*qtblptr)->sent_table = FALSE;
- }
- }
- /* Copy the source's per-component info.
- * Note we assume jpeg_set_defaults has allocated the dest comp_info array.
- */
- dstinfo->num_components = srcinfo->num_components;
- if (dstinfo->num_components < 1 || dstinfo->num_components > MAX_COMPONENTS)
- ERREXIT2(dstinfo, JERR_COMPONENT_COUNT, dstinfo->num_components,
- MAX_COMPONENTS);
- for (ci = 0, incomp = srcinfo->comp_info, outcomp = dstinfo->comp_info;
- ci < dstinfo->num_components; ci++, incomp++, outcomp++) {
- outcomp->component_id = incomp->component_id;
- outcomp->h_samp_factor = incomp->h_samp_factor;
- outcomp->v_samp_factor = incomp->v_samp_factor;
- outcomp->quant_tbl_no = incomp->quant_tbl_no;
- /* Make sure saved quantization table for component matches the qtable
- * slot. If not, the input file re-used this qtable slot.
- * IJG encoder currently cannot duplicate this.
- */
- tblno = outcomp->quant_tbl_no;
- if (tblno < 0 || tblno >= NUM_QUANT_TBLS ||
- srcinfo->quant_tbl_ptrs[tblno] == NULL)
- ERREXIT1(dstinfo, JERR_NO_QUANT_TABLE, tblno);
- slot_quant = srcinfo->quant_tbl_ptrs[tblno];
- c_quant = incomp->quant_table;
- if (c_quant != NULL) {
- for (coefi = 0; coefi < DCTSIZE2; coefi++) {
- if (c_quant->quantval[coefi] != slot_quant->quantval[coefi])
- ERREXIT1(dstinfo, JERR_MISMATCHED_QUANT_TABLE, tblno);
- }
- }
- /* Note: we do not copy the source's Huffman table assignments;
- * instead we rely on jpeg_set_colorspace to have made a suitable choice.
- */
- }
- /* Also copy JFIF version and resolution information, if available.
- * Strictly speaking this isn't "critical" info, but it's nearly
- * always appropriate to copy it if available. In particular,
- * if the application chooses to copy JFIF 1.02 extension markers from
- * the source file, we need to copy the version to make sure we don't
- * emit a file that has 1.02 extensions but a claimed version of 1.01.
- * We will *not*, however, copy version info from mislabeled "2.01" files.
- */
- if (srcinfo->saw_JFIF_marker) {
- if (srcinfo->JFIF_major_version == 1) {
- dstinfo->JFIF_major_version = srcinfo->JFIF_major_version;
- dstinfo->JFIF_minor_version = srcinfo->JFIF_minor_version;
- }
- dstinfo->density_unit = srcinfo->density_unit;
- dstinfo->X_density = srcinfo->X_density;
- dstinfo->Y_density = srcinfo->Y_density;
- }
-}
-
-
-/*
- * Master selection of compression modules for transcoding.
- * This substitutes for jcinit.c's initialization of the full compressor.
- */
-
-LOCAL(void)
-transencode_master_selection (j_compress_ptr cinfo,
- jvirt_barray_ptr * coef_arrays)
-{
- /* Although we don't actually use input_components for transcoding,
- * jcmaster.c's initial_setup will complain if input_components is 0.
- */
- cinfo->input_components = 1;
- /* Initialize master control (includes parameter checking/processing) */
- jinit_c_master_control(cinfo, TRUE /* transcode only */);
-
- /* Entropy encoding: either Huffman or arithmetic coding. */
- if (cinfo->arith_code) {
- ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
- } else {
- if (cinfo->progressive_mode) {
-#ifdef C_PROGRESSIVE_SUPPORTED
- jinit_phuff_encoder(cinfo);
-#else
- ERREXIT(cinfo, JERR_NOT_COMPILED);
-#endif
- } else
- jinit_huff_encoder(cinfo);
- }
-
- /* We need a special coefficient buffer controller. */
- transencode_coef_controller(cinfo, coef_arrays);
-
- jinit_marker_writer(cinfo);
-
- /* We can now tell the memory manager to allocate virtual arrays. */
- (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
-
- /* Write the datastream header (SOI, JFIF) immediately.
- * Frame and scan headers are postponed till later.
- * This lets application insert special markers after the SOI.
- */
- (*cinfo->marker->write_file_header) (cinfo);
-}
-
-
-/*
- * The rest of this file is a special implementation of the coefficient
- * buffer controller. This is similar to jccoefct.c, but it handles only
- * output from presupplied virtual arrays. Furthermore, we generate any
- * dummy padding blocks on-the-fly rather than expecting them to be present
- * in the arrays.
- */
-
-/* Private buffer controller object */
-
-typedef struct {
- struct jpeg_c_coef_controller pub; /* public fields */
-
- JDIMENSION iMCU_row_num; /* iMCU row # within image */
- JDIMENSION mcu_ctr; /* counts MCUs processed in current row */
- int MCU_vert_offset; /* counts MCU rows within iMCU row */
- int MCU_rows_per_iMCU_row; /* number of such rows needed */
-
- /* Virtual block array for each component. */
- jvirt_barray_ptr * whole_image;
-
- /* Workspace for constructing dummy blocks at right/bottom edges. */
- JBLOCKROW dummy_buffer[C_MAX_BLOCKS_IN_MCU];
-} my_coef_controller;
-
-typedef my_coef_controller * my_coef_ptr;
-
-
-LOCAL(void)
-start_iMCU_row (j_compress_ptr cinfo)
-/* Reset within-iMCU-row counters for a new row */
-{
- my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
-
- /* In an interleaved scan, an MCU row is the same as an iMCU row.
- * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows.
- * But at the bottom of the image, process only what's left.
- */
- if (cinfo->comps_in_scan > 1) {
- coef->MCU_rows_per_iMCU_row = 1;
- } else {
- if (coef->iMCU_row_num < (cinfo->total_iMCU_rows-1))
- coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor;
- else
- coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height;
- }
-
- coef->mcu_ctr = 0;
- coef->MCU_vert_offset = 0;
-}
-
-
-/*
- * Initialize for a processing pass.
- */
-
-METHODDEF(void)
-start_pass_coef (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
-{
- my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
-
- if (pass_mode != JBUF_CRANK_DEST)
- ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
-
- coef->iMCU_row_num = 0;
- start_iMCU_row(cinfo);
-}
-
-
-/*
- * Process some data.
- * We process the equivalent of one fully interleaved MCU row ("iMCU" row)
- * per call, ie, v_samp_factor block rows for each component in the scan.
- * The data is obtained from the virtual arrays and fed to the entropy coder.
- * Returns TRUE if the iMCU row is completed, FALSE if suspended.
- *
- * NB: input_buf is ignored; it is likely to be a NULL pointer.
- */
-
-METHODDEF(boolean)
-compress_output (j_compress_ptr cinfo, JSAMPIMAGE input_buf)
-{
- my_coef_ptr coef = (my_coef_ptr) cinfo->coef;
- JDIMENSION MCU_col_num; /* index of current MCU within row */
- JDIMENSION last_MCU_col = cinfo->MCUs_per_row - 1;
- JDIMENSION last_iMCU_row = cinfo->total_iMCU_rows - 1;
- int blkn, ci, xindex, yindex, yoffset, blockcnt;
- JDIMENSION start_col;
- JBLOCKARRAY buffer[MAX_COMPS_IN_SCAN];
- JBLOCKROW MCU_buffer[C_MAX_BLOCKS_IN_MCU];
- JBLOCKROW buffer_ptr;
- jpeg_component_info *compptr;
-
- /* Align the virtual buffers for the components used in this scan. */
- for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
- compptr = cinfo->cur_comp_info[ci];
- buffer[ci] = (*cinfo->mem->access_virt_barray)
- ((j_common_ptr) cinfo, coef->whole_image[compptr->component_index],
- coef->iMCU_row_num * compptr->v_samp_factor,
- (JDIMENSION) compptr->v_samp_factor, FALSE);
- }
-
- /* Loop to process one whole iMCU row */
- for (yoffset = coef->MCU_vert_offset; yoffset < coef->MCU_rows_per_iMCU_row;
- yoffset++) {
- for (MCU_col_num = coef->mcu_ctr; MCU_col_num < cinfo->MCUs_per_row;
- MCU_col_num++) {
- /* Construct list of pointers to DCT blocks belonging to this MCU */
- blkn = 0; /* index of current DCT block within MCU */
- for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
- compptr = cinfo->cur_comp_info[ci];
- start_col = MCU_col_num * compptr->MCU_width;
- blockcnt = (MCU_col_num < last_MCU_col) ? compptr->MCU_width
- : compptr->last_col_width;
- for (yindex = 0; yindex < compptr->MCU_height; yindex++) {
- if (coef->iMCU_row_num < last_iMCU_row ||
- yindex+yoffset < compptr->last_row_height) {
- /* Fill in pointers to real blocks in this row */
- buffer_ptr = buffer[ci][yindex+yoffset] + start_col;
- for (xindex = 0; xindex < blockcnt; xindex++)
- MCU_buffer[blkn++] = buffer_ptr++;
- } else {
- /* At bottom of image, need a whole row of dummy blocks */
- xindex = 0;
- }
- /* Fill in any dummy blocks needed in this row.
- * Dummy blocks are filled in the same way as in jccoefct.c:
- * all zeroes in the AC entries, DC entries equal to previous
- * block's DC value. The init routine has already zeroed the
- * AC entries, so we need only set the DC entries correctly.
- */
- for (; xindex < compptr->MCU_width; xindex++) {
- MCU_buffer[blkn] = coef->dummy_buffer[blkn];
- MCU_buffer[blkn][0][0] = MCU_buffer[blkn-1][0][0];
- blkn++;
- }
- }
- }
- /* Try to write the MCU. */
- if (! (*cinfo->entropy->encode_mcu) (cinfo, MCU_buffer)) {
- /* Suspension forced; update state counters and exit */
- coef->MCU_vert_offset = yoffset;
- coef->mcu_ctr = MCU_col_num;
- return FALSE;
- }
- }
- /* Completed an MCU row, but perhaps not an iMCU row */
- coef->mcu_ctr = 0;
- }
- /* Completed the iMCU row, advance counters for next one */
- coef->iMCU_row_num++;
- start_iMCU_row(cinfo);
- return TRUE;
-}
-
-
-/*
- * Initialize coefficient buffer controller.
- *
- * Each passed coefficient array must be the right size for that
- * coefficient: width_in_blocks wide and height_in_blocks high,
- * with unitheight at least v_samp_factor.
- */
-
-LOCAL(void)
-transencode_coef_controller (j_compress_ptr cinfo,
- jvirt_barray_ptr * coef_arrays)
-{
- my_coef_ptr coef;
- JBLOCKROW buffer;
- int i;
-
- coef = (my_coef_ptr)
- (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
- SIZEOF(my_coef_controller));
- cinfo->coef = (struct jpeg_c_coef_controller *) coef;
- coef->pub.start_pass = start_pass_coef;
- coef->pub.compress_data = compress_output;
-
- /* Save pointer to virtual arrays */
- coef->whole_image = coef_arrays;
-
- /* Allocate and pre-zero space for dummy DCT blocks. */
- buffer = (JBLOCKROW)
- (*cinfo->mem->alloc_large) ((j_common_ptr) cinfo, JPOOL_IMAGE,
- C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK));
- jzero_far((void FAR *) buffer, C_MAX_BLOCKS_IN_MCU * SIZEOF(JBLOCK));
- for (i = 0; i < C_MAX_BLOCKS_IN_MCU; i++) {
- coef->dummy_buffer[i] = buffer + i;
- }
-}
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