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- #include "jinclude.h"
- #include "jdmainct.h"
- METHODDEF(void) process_data_simple_main(j_decompress_ptr cinfo,
- JSAMPARRAY output_buf,
- JDIMENSION *out_row_ctr,
- JDIMENSION out_rows_avail);
- METHODDEF(void) process_data_context_main(j_decompress_ptr cinfo,
- JSAMPARRAY output_buf,
- JDIMENSION *out_row_ctr,
- JDIMENSION out_rows_avail);
- #ifdef QUANT_2PASS_SUPPORTED
- METHODDEF(void) process_data_crank_post(j_decompress_ptr cinfo,
- JSAMPARRAY output_buf,
- JDIMENSION *out_row_ctr,
- JDIMENSION out_rows_avail);
- #endif
- LOCAL(void)
- alloc_funny_pointers(j_decompress_ptr cinfo)
- {
- my_main_ptr main_ptr = (my_main_ptr)cinfo->main;
- int ci, rgroup;
- int M = cinfo->_min_DCT_scaled_size;
- jpeg_component_info *compptr;
- JSAMPARRAY xbuf;
-
- main_ptr->xbuffer[0] = (JSAMPIMAGE)
- (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
- cinfo->num_components * 2 * sizeof(JSAMPARRAY));
- main_ptr->xbuffer[1] = main_ptr->xbuffer[0] + cinfo->num_components;
- for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
- ci++, compptr++) {
- rgroup = (compptr->v_samp_factor * compptr->_DCT_scaled_size) /
- cinfo->_min_DCT_scaled_size;
-
- xbuf = (JSAMPARRAY)
- (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
- 2 * (rgroup * (M + 4)) * sizeof(JSAMPROW));
- xbuf += rgroup;
- main_ptr->xbuffer[0][ci] = xbuf;
- xbuf += rgroup * (M + 4);
- main_ptr->xbuffer[1][ci] = xbuf;
- }
- }
- LOCAL(void)
- make_funny_pointers(j_decompress_ptr cinfo)
- {
- my_main_ptr main_ptr = (my_main_ptr)cinfo->main;
- int ci, i, rgroup;
- int M = cinfo->_min_DCT_scaled_size;
- jpeg_component_info *compptr;
- JSAMPARRAY buf, xbuf0, xbuf1;
- for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
- ci++, compptr++) {
- rgroup = (compptr->v_samp_factor * compptr->_DCT_scaled_size) /
- cinfo->_min_DCT_scaled_size;
- xbuf0 = main_ptr->xbuffer[0][ci];
- xbuf1 = main_ptr->xbuffer[1][ci];
-
- buf = main_ptr->buffer[ci];
- for (i = 0; i < rgroup * (M + 2); i++) {
- xbuf0[i] = xbuf1[i] = buf[i];
- }
-
- for (i = 0; i < rgroup * 2; i++) {
- xbuf1[rgroup * (M - 2) + i] = buf[rgroup * M + i];
- xbuf1[rgroup * M + i] = buf[rgroup * (M - 2) + i];
- }
-
- for (i = 0; i < rgroup; i++) {
- xbuf0[i - rgroup] = xbuf0[0];
- }
- }
- }
- LOCAL(void)
- set_bottom_pointers(j_decompress_ptr cinfo)
- {
- my_main_ptr main_ptr = (my_main_ptr)cinfo->main;
- int ci, i, rgroup, iMCUheight, rows_left;
- jpeg_component_info *compptr;
- JSAMPARRAY xbuf;
- for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
- ci++, compptr++) {
-
- iMCUheight = compptr->v_samp_factor * compptr->_DCT_scaled_size;
- rgroup = iMCUheight / cinfo->_min_DCT_scaled_size;
-
- rows_left = (int)(compptr->downsampled_height % (JDIMENSION)iMCUheight);
- if (rows_left == 0) rows_left = iMCUheight;
-
- if (ci == 0) {
- main_ptr->rowgroups_avail = (JDIMENSION)((rows_left - 1) / rgroup + 1);
- }
-
- xbuf = main_ptr->xbuffer[main_ptr->whichptr][ci];
- for (i = 0; i < rgroup * 2; i++) {
- xbuf[rows_left + i] = xbuf[rows_left - 1];
- }
- }
- }
- METHODDEF(void)
- start_pass_main(j_decompress_ptr cinfo, J_BUF_MODE pass_mode)
- {
- my_main_ptr main_ptr = (my_main_ptr)cinfo->main;
- switch (pass_mode) {
- case JBUF_PASS_THRU:
- if (cinfo->upsample->need_context_rows) {
- main_ptr->pub.process_data = process_data_context_main;
- make_funny_pointers(cinfo);
- main_ptr->whichptr = 0;
- main_ptr->context_state = CTX_PREPARE_FOR_IMCU;
- main_ptr->iMCU_row_ctr = 0;
- } else {
-
- main_ptr->pub.process_data = process_data_simple_main;
- }
- main_ptr->buffer_full = FALSE;
- main_ptr->rowgroup_ctr = 0;
- break;
- #ifdef QUANT_2PASS_SUPPORTED
- case JBUF_CRANK_DEST:
-
- main_ptr->pub.process_data = process_data_crank_post;
- break;
- #endif
- default:
- ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
- break;
- }
- }
- METHODDEF(void)
- process_data_simple_main(j_decompress_ptr cinfo, JSAMPARRAY output_buf,
- JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)
- {
- my_main_ptr main_ptr = (my_main_ptr)cinfo->main;
- JDIMENSION rowgroups_avail;
-
- if (!main_ptr->buffer_full) {
- if (!(*cinfo->coef->decompress_data) (cinfo, main_ptr->buffer))
- return;
- main_ptr->buffer_full = TRUE;
- }
-
- rowgroups_avail = (JDIMENSION)cinfo->_min_DCT_scaled_size;
-
-
- (*cinfo->post->post_process_data) (cinfo, main_ptr->buffer,
- &main_ptr->rowgroup_ctr, rowgroups_avail,
- output_buf, out_row_ctr, out_rows_avail);
-
- if (main_ptr->rowgroup_ctr >= rowgroups_avail) {
- main_ptr->buffer_full = FALSE;
- main_ptr->rowgroup_ctr = 0;
- }
- }
- METHODDEF(void)
- process_data_context_main(j_decompress_ptr cinfo, JSAMPARRAY output_buf,
- JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)
- {
- my_main_ptr main_ptr = (my_main_ptr)cinfo->main;
-
- if (!main_ptr->buffer_full) {
- if (!(*cinfo->coef->decompress_data) (cinfo,
- main_ptr->xbuffer[main_ptr->whichptr]))
- return;
- main_ptr->buffer_full = TRUE;
- main_ptr->iMCU_row_ctr++;
- }
-
- switch (main_ptr->context_state) {
- case CTX_POSTPONED_ROW:
-
- (*cinfo->post->post_process_data) (cinfo,
- main_ptr->xbuffer[main_ptr->whichptr],
- &main_ptr->rowgroup_ctr,
- main_ptr->rowgroups_avail, output_buf,
- out_row_ctr, out_rows_avail);
- if (main_ptr->rowgroup_ctr < main_ptr->rowgroups_avail)
- return;
- main_ptr->context_state = CTX_PREPARE_FOR_IMCU;
- if (*out_row_ctr >= out_rows_avail)
- return;
-
- case CTX_PREPARE_FOR_IMCU:
-
- main_ptr->rowgroup_ctr = 0;
- main_ptr->rowgroups_avail = (JDIMENSION)(cinfo->_min_DCT_scaled_size - 1);
-
- if (main_ptr->iMCU_row_ctr == cinfo->total_iMCU_rows)
- set_bottom_pointers(cinfo);
- main_ptr->context_state = CTX_PROCESS_IMCU;
-
- case CTX_PROCESS_IMCU:
-
- (*cinfo->post->post_process_data) (cinfo,
- main_ptr->xbuffer[main_ptr->whichptr],
- &main_ptr->rowgroup_ctr,
- main_ptr->rowgroups_avail, output_buf,
- out_row_ctr, out_rows_avail);
- if (main_ptr->rowgroup_ctr < main_ptr->rowgroups_avail)
- return;
-
- if (main_ptr->iMCU_row_ctr == 1)
- set_wraparound_pointers(cinfo);
-
- main_ptr->whichptr ^= 1;
- main_ptr->buffer_full = FALSE;
-
-
- main_ptr->rowgroup_ctr = (JDIMENSION)(cinfo->_min_DCT_scaled_size + 1);
- main_ptr->rowgroups_avail = (JDIMENSION)(cinfo->_min_DCT_scaled_size + 2);
- main_ptr->context_state = CTX_POSTPONED_ROW;
- }
- }
- #ifdef QUANT_2PASS_SUPPORTED
- METHODDEF(void)
- process_data_crank_post(j_decompress_ptr cinfo, JSAMPARRAY output_buf,
- JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail)
- {
- (*cinfo->post->post_process_data) (cinfo, (JSAMPIMAGE)NULL,
- (JDIMENSION *)NULL, (JDIMENSION)0,
- output_buf, out_row_ctr, out_rows_avail);
- }
- #endif
- GLOBAL(void)
- jinit_d_main_controller(j_decompress_ptr cinfo, boolean need_full_buffer)
- {
- my_main_ptr main_ptr;
- int ci, rgroup, ngroups;
- jpeg_component_info *compptr;
- main_ptr = (my_main_ptr)
- (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
- sizeof(my_main_controller));
- cinfo->main = (struct jpeg_d_main_controller *)main_ptr;
- main_ptr->pub.start_pass = start_pass_main;
- if (need_full_buffer)
- ERREXIT(cinfo, JERR_BAD_BUFFER_MODE);
-
- if (cinfo->upsample->need_context_rows) {
- if (cinfo->_min_DCT_scaled_size < 2)
- ERREXIT(cinfo, JERR_NOTIMPL);
- alloc_funny_pointers(cinfo);
- ngroups = cinfo->_min_DCT_scaled_size + 2;
- } else {
- ngroups = cinfo->_min_DCT_scaled_size;
- }
- for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
- ci++, compptr++) {
- rgroup = (compptr->v_samp_factor * compptr->_DCT_scaled_size) /
- cinfo->_min_DCT_scaled_size;
- main_ptr->buffer[ci] = (*cinfo->mem->alloc_sarray)
- ((j_common_ptr)cinfo, JPOOL_IMAGE,
- compptr->width_in_blocks * compptr->_DCT_scaled_size,
- (JDIMENSION)(rgroup * ngroups));
- }
- }
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