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- #define JPEG_INTERNALS
- #include "jinclude.h"
- #include "jpeglib.h"
- #include "jpegcomp.h"
- typedef struct {
- struct jpeg_input_controller pub;
- boolean inheaders;
- } my_input_controller;
- typedef my_input_controller *my_inputctl_ptr;
- METHODDEF(int) consume_markers(j_decompress_ptr cinfo);
- LOCAL(void)
- initial_setup(j_decompress_ptr cinfo)
- {
- int ci;
- jpeg_component_info *compptr;
-
- if ((long)cinfo->image_height > (long)JPEG_MAX_DIMENSION ||
- (long)cinfo->image_width > (long)JPEG_MAX_DIMENSION)
- ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int)JPEG_MAX_DIMENSION);
-
- if (cinfo->data_precision != BITS_IN_JSAMPLE)
- ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
-
- if (cinfo->num_components > MAX_COMPONENTS)
- ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
- MAX_COMPONENTS);
-
- cinfo->max_h_samp_factor = 1;
- cinfo->max_v_samp_factor = 1;
- for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
- ci++, compptr++) {
- if (compptr->h_samp_factor <= 0 ||
- compptr->h_samp_factor > MAX_SAMP_FACTOR ||
- compptr->v_samp_factor <= 0 ||
- compptr->v_samp_factor > MAX_SAMP_FACTOR)
- ERREXIT(cinfo, JERR_BAD_SAMPLING);
- cinfo->max_h_samp_factor = MAX(cinfo->max_h_samp_factor,
- compptr->h_samp_factor);
- cinfo->max_v_samp_factor = MAX(cinfo->max_v_samp_factor,
- compptr->v_samp_factor);
- }
- #if JPEG_LIB_VERSION >= 80
- cinfo->block_size = DCTSIZE;
- cinfo->natural_order = jpeg_natural_order;
- cinfo->lim_Se = DCTSIZE2 - 1;
- #endif
-
- #if JPEG_LIB_VERSION >= 70
- cinfo->min_DCT_h_scaled_size = cinfo->min_DCT_v_scaled_size = DCTSIZE;
- #else
- cinfo->min_DCT_scaled_size = DCTSIZE;
- #endif
-
- for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
- ci++, compptr++) {
- #if JPEG_LIB_VERSION >= 70
- compptr->DCT_h_scaled_size = compptr->DCT_v_scaled_size = DCTSIZE;
- #else
- compptr->DCT_scaled_size = DCTSIZE;
- #endif
-
- compptr->width_in_blocks = (JDIMENSION)
- jdiv_round_up((long)cinfo->image_width * (long)compptr->h_samp_factor,
- (long)(cinfo->max_h_samp_factor * DCTSIZE));
- compptr->height_in_blocks = (JDIMENSION)
- jdiv_round_up((long)cinfo->image_height * (long)compptr->v_samp_factor,
- (long)(cinfo->max_v_samp_factor * DCTSIZE));
-
- cinfo->master->first_MCU_col[ci] = 0;
- cinfo->master->last_MCU_col[ci] = compptr->width_in_blocks - 1;
-
-
- compptr->downsampled_width = (JDIMENSION)
- jdiv_round_up((long)cinfo->image_width * (long)compptr->h_samp_factor,
- (long)cinfo->max_h_samp_factor);
- compptr->downsampled_height = (JDIMENSION)
- jdiv_round_up((long)cinfo->image_height * (long)compptr->v_samp_factor,
- (long)cinfo->max_v_samp_factor);
-
- compptr->component_needed = TRUE;
-
- compptr->quant_table = NULL;
- }
-
- cinfo->total_iMCU_rows = (JDIMENSION)
- jdiv_round_up((long)cinfo->image_height,
- (long)(cinfo->max_v_samp_factor * DCTSIZE));
-
- if (cinfo->comps_in_scan < cinfo->num_components || cinfo->progressive_mode)
- cinfo->inputctl->has_multiple_scans = TRUE;
- else
- cinfo->inputctl->has_multiple_scans = FALSE;
- }
- LOCAL(void)
- per_scan_setup(j_decompress_ptr cinfo)
- {
- int ci, mcublks, tmp;
- jpeg_component_info *compptr;
- if (cinfo->comps_in_scan == 1) {
-
- compptr = cinfo->cur_comp_info[0];
-
- cinfo->MCUs_per_row = compptr->width_in_blocks;
- cinfo->MCU_rows_in_scan = compptr->height_in_blocks;
-
- compptr->MCU_width = 1;
- compptr->MCU_height = 1;
- compptr->MCU_blocks = 1;
- compptr->MCU_sample_width = compptr->_DCT_scaled_size;
- compptr->last_col_width = 1;
-
- tmp = (int)(compptr->height_in_blocks % compptr->v_samp_factor);
- if (tmp == 0) tmp = compptr->v_samp_factor;
- compptr->last_row_height = tmp;
-
- cinfo->blocks_in_MCU = 1;
- cinfo->MCU_membership[0] = 0;
- } else {
-
- if (cinfo->comps_in_scan <= 0 || cinfo->comps_in_scan > MAX_COMPS_IN_SCAN)
- ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->comps_in_scan,
- MAX_COMPS_IN_SCAN);
-
- cinfo->MCUs_per_row = (JDIMENSION)
- jdiv_round_up((long)cinfo->image_width,
- (long)(cinfo->max_h_samp_factor * DCTSIZE));
- cinfo->MCU_rows_in_scan = (JDIMENSION)
- jdiv_round_up((long)cinfo->image_height,
- (long)(cinfo->max_v_samp_factor * DCTSIZE));
- cinfo->blocks_in_MCU = 0;
- for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
- compptr = cinfo->cur_comp_info[ci];
-
- compptr->MCU_width = compptr->h_samp_factor;
- compptr->MCU_height = compptr->v_samp_factor;
- compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height;
- compptr->MCU_sample_width = compptr->MCU_width *
- compptr->_DCT_scaled_size;
-
- tmp = (int)(compptr->width_in_blocks % compptr->MCU_width);
- if (tmp == 0) tmp = compptr->MCU_width;
- compptr->last_col_width = tmp;
- tmp = (int)(compptr->height_in_blocks % compptr->MCU_height);
- if (tmp == 0) tmp = compptr->MCU_height;
- compptr->last_row_height = tmp;
-
- mcublks = compptr->MCU_blocks;
- if (cinfo->blocks_in_MCU + mcublks > D_MAX_BLOCKS_IN_MCU)
- ERREXIT(cinfo, JERR_BAD_MCU_SIZE);
- while (mcublks-- > 0) {
- cinfo->MCU_membership[cinfo->blocks_in_MCU++] = ci;
- }
- }
- }
- }
- LOCAL(void)
- latch_quant_tables(j_decompress_ptr cinfo)
- {
- int ci, qtblno;
- jpeg_component_info *compptr;
- JQUANT_TBL *qtbl;
- for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
- compptr = cinfo->cur_comp_info[ci];
-
- if (compptr->quant_table != NULL)
- continue;
-
- qtblno = compptr->quant_tbl_no;
- if (qtblno < 0 || qtblno >= NUM_QUANT_TBLS ||
- cinfo->quant_tbl_ptrs[qtblno] == NULL)
- ERREXIT1(cinfo, JERR_NO_QUANT_TABLE, qtblno);
-
- qtbl = (JQUANT_TBL *)
- (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
- sizeof(JQUANT_TBL));
- MEMCOPY(qtbl, cinfo->quant_tbl_ptrs[qtblno], sizeof(JQUANT_TBL));
- compptr->quant_table = qtbl;
- }
- }
- METHODDEF(void)
- start_input_pass(j_decompress_ptr cinfo)
- {
- per_scan_setup(cinfo);
- latch_quant_tables(cinfo);
- (*cinfo->entropy->start_pass) (cinfo);
- (*cinfo->coef->start_input_pass) (cinfo);
- cinfo->inputctl->consume_input = cinfo->coef->consume_data;
- }
- METHODDEF(void)
- finish_input_pass(j_decompress_ptr cinfo)
- {
- cinfo->inputctl->consume_input = consume_markers;
- }
- METHODDEF(int)
- consume_markers(j_decompress_ptr cinfo)
- {
- my_inputctl_ptr inputctl = (my_inputctl_ptr)cinfo->inputctl;
- int val;
- if (inputctl->pub.eoi_reached)
- return JPEG_REACHED_EOI;
- val = (*cinfo->marker->read_markers) (cinfo);
- switch (val) {
- case JPEG_REACHED_SOS:
- if (inputctl->inheaders) {
- initial_setup(cinfo);
- inputctl->inheaders = FALSE;
-
- } else {
- if (!inputctl->pub.has_multiple_scans)
- ERREXIT(cinfo, JERR_EOI_EXPECTED);
- start_input_pass(cinfo);
- }
- break;
- case JPEG_REACHED_EOI:
- inputctl->pub.eoi_reached = TRUE;
- if (inputctl->inheaders) {
- if (cinfo->marker->saw_SOF)
- ERREXIT(cinfo, JERR_SOF_NO_SOS);
- } else {
-
- if (cinfo->output_scan_number > cinfo->input_scan_number)
- cinfo->output_scan_number = cinfo->input_scan_number;
- }
- break;
- case JPEG_SUSPENDED:
- break;
- }
- return val;
- }
- METHODDEF(void)
- reset_input_controller(j_decompress_ptr cinfo)
- {
- my_inputctl_ptr inputctl = (my_inputctl_ptr)cinfo->inputctl;
- inputctl->pub.consume_input = consume_markers;
- inputctl->pub.has_multiple_scans = FALSE;
- inputctl->pub.eoi_reached = FALSE;
- inputctl->inheaders = TRUE;
-
- (*cinfo->err->reset_error_mgr) ((j_common_ptr)cinfo);
- (*cinfo->marker->reset_marker_reader) (cinfo);
-
- cinfo->coef_bits = NULL;
- }
- GLOBAL(void)
- jinit_input_controller(j_decompress_ptr cinfo)
- {
- my_inputctl_ptr inputctl;
-
- inputctl = (my_inputctl_ptr)
- (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_PERMANENT,
- sizeof(my_input_controller));
- cinfo->inputctl = (struct jpeg_input_controller *)inputctl;
-
- inputctl->pub.consume_input = consume_markers;
- inputctl->pub.reset_input_controller = reset_input_controller;
- inputctl->pub.start_input_pass = start_input_pass;
- inputctl->pub.finish_input_pass = finish_input_pass;
-
- inputctl->pub.has_multiple_scans = FALSE;
- inputctl->pub.eoi_reached = FALSE;
- inputctl->inheaders = TRUE;
- }
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