xref: /third_party/skia/third_party/externals/libjpeg-turbo/jcarith.c

122 emit_byte(int val, j_compress_ptr cinfo)
125   struct jpeg_destination_mgr *dest = cinfo->dest;
129     if (!(*dest->empty_output_buffer) (cinfo))
130       ERREXIT(cinfo, JERR_CANT_SUSPEND);
139 finish_pass(j_compress_ptr cinfo)
141   arith_entropy_ptr e = (arith_entropy_ptr)cinfo->entropy;
158         do emit_byte(0x00, cinfo);
160       emit_byte(e->buffer + 1, cinfo);
162         emit_byte(0x00, cinfo);
171         do emit_byte(0x00, cinfo);
173       emit_byte(e->buffer, cinfo);
177         do emit_byte(0x00, cinfo);
180         emit_byte(0xFF, cinfo);
181         emit_byte(0x00, cinfo);
188       do emit_byte(0x00, cinfo);
190     emit_byte((e->c >> 19) & 0xFF, cinfo);
192       emit_byte(0x00, cinfo);
194       emit_byte((e->c >> 11) & 0xFF, cinfo);
196         emit_byte(0x00, cinfo);
225 arith_encode(j_compress_ptr cinfo, unsigned char *st, int val)
227   register arith_entropy_ptr e = (arith_entropy_ptr)cinfo->entropy;
278             do emit_byte(0x00, cinfo);
280           emit_byte(e->buffer + 1, cinfo);
282             emit_byte(0x00, cinfo);
298             do emit_byte(0x00, cinfo);
300           emit_byte(e->buffer, cinfo);
304             do emit_byte(0x00, cinfo);
307             emit_byte(0xFF, cinfo);
308             emit_byte(0x00, cinfo);
325 emit_restart(j_compress_ptr cinfo, int restart_num)
327   arith_entropy_ptr entropy = (arith_entropy_ptr)cinfo->entropy;
331   finish_pass(cinfo);
333   emit_byte(0xFF, cinfo);
334   emit_byte(JPEG_RST0 + restart_num, cinfo);
337   for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
338     compptr = cinfo->cur_comp_info[ci];
340     if (cinfo->progressive_mode == 0 || (cinfo->Ss == 0 && cinfo->Ah == 0)) {
347     if (cinfo->progressive_mode == 0 || cinfo->Se) {
368 encode_mcu_DC_first(j_compress_ptr cinfo, JBLOCKROW *MCU_data)
370   arith_entropy_ptr entropy = (arith_entropy_ptr)cinfo->entropy;
378   if (cinfo->restart_interval) {
380       emit_restart(cinfo, entropy->next_restart_num);
381       entropy->restarts_to_go = cinfo->restart_interval;
389   for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
391     ci = cinfo->MCU_membership[blkn];
392     tbl = cinfo->cur_comp_info[ci]->dc_tbl_no;
397     m = IRIGHT_SHIFT((int)((*block)[0]), cinfo->Al);
406       arith_encode(cinfo, st, 0);
410       arith_encode(cinfo, st, 1);
414         arith_encode(cinfo, st + 1, 0); /* Table F.4: SS = S0 + 1 */
419         arith_encode(cinfo, st + 1, 1); /* Table F.4: SS = S0 + 1 */
426         arith_encode(cinfo, st, 1);
431           arith_encode(cinfo, st, 1);
436       arith_encode(cinfo, st, 0);
438       if (m < (int)((1L << cinfo->arith_dc_L[tbl]) >> 1))
440       else if (m > (int)((1L << cinfo->arith_dc_U[tbl]) >> 1))
445         arith_encode(cinfo, st, (m & v) ? 1 : 0);
459 encode_mcu_AC_first(j_compress_ptr cinfo, JBLOCKROW *MCU_data)
461   arith_entropy_ptr entropy = (arith_entropy_ptr)cinfo->entropy;
468   if (cinfo->restart_interval) {
470       emit_restart(cinfo, entropy->next_restart_num);
471       entropy->restarts_to_go = cinfo->restart_interval;
480   tbl = cinfo->cur_comp_info[0]->ac_tbl_no;
485   for (ke = cinfo->Se; ke > 0; ke--)
491       if (v >>= cinfo->Al) break;
494       if (v >>= cinfo->Al) break;
498   for (k = cinfo->Ss; k <= ke; k++) {
500     arith_encode(cinfo, st, 0);         /* EOB decision */
503         if (v >>= cinfo->Al) {
504           arith_encode(cinfo, st + 1, 1);
505           arith_encode(cinfo, entropy->fixed_bin, 0);
510         if (v >>= cinfo->Al) {
511           arith_encode(cinfo, st + 1, 1);
512           arith_encode(cinfo, entropy->fixed_bin, 1);
516       arith_encode(cinfo, st + 1, 0);  st += 3;  k++;
522       arith_encode(cinfo, st, 1);
526         arith_encode(cinfo, st, 1);
529              (k <= cinfo->arith_ac_K[tbl] ? 189 : 217);
531           arith_encode(cinfo, st, 1);
537     arith_encode(cinfo, st, 0);
541       arith_encode(cinfo, st, (m & v) ? 1 : 0);
543   /* Encode EOB decision only if k <= cinfo->Se */
544   if (k <= cinfo->Se) {
546     arith_encode(cinfo, st, 1);
558 encode_mcu_DC_refine(j_compress_ptr cinfo, JBLOCKROW *MCU_data)
560   arith_entropy_ptr entropy = (arith_entropy_ptr)cinfo->entropy;
565   if (cinfo->restart_interval) {
567       emit_restart(cinfo, entropy->next_restart_num);
568       entropy->restarts_to_go = cinfo->restart_interval;
576   Al = cinfo->Al;
579   for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
581     arith_encode(cinfo, st, (MCU_data[blkn][0][0] >> Al) & 1);
593 encode_mcu_AC_refine(j_compress_ptr cinfo, JBLOCKROW *MCU_data)
595   arith_entropy_ptr entropy = (arith_entropy_ptr)cinfo->entropy;
602   if (cinfo->restart_interval) {
604       emit_restart(cinfo, entropy->next_restart_num);
605       entropy->restarts_to_go = cinfo->restart_interval;
614   tbl = cinfo->cur_comp_info[0]->ac_tbl_no;
619   for (ke = cinfo->Se; ke > 0; ke--)
625       if (v >>= cinfo->Al) break;
628       if (v >>= cinfo->Al) break;
634       if (v >>= cinfo->Ah) break;
637       if (v >>= cinfo->Ah) break;
641   for (k = cinfo->Ss; k <= ke; k++) {
644       arith_encode(cinfo, st, 0);       /* EOB decision */
647         if (v >>= cinfo->Al) {
649             arith_encode(cinfo, st + 2, (v & 1));
651             arith_encode(cinfo, st + 1, 1);
652             arith_encode(cinfo, entropy->fixed_bin, 0);
658         if (v >>= cinfo->Al) {
660             arith_encode(cinfo, st + 2, (v & 1));
662             arith_encode(cinfo, st + 1, 1);
663             arith_encode(cinfo, entropy->fixed_bin, 1);
668       arith_encode(cinfo, st + 1, 0);  st += 3;  k++;
671   /* Encode EOB decision only if k <= cinfo->Se */
672   if (k <= cinfo->Se) {
674     arith_encode(cinfo, st, 1);
686 encode_mcu(j_compress_ptr cinfo, JBLOCKROW *MCU_data)
688   arith_entropy_ptr entropy = (arith_entropy_ptr)cinfo->entropy;
696   if (cinfo->restart_interval) {
698       emit_restart(cinfo, entropy->next_restart_num);
699       entropy->restarts_to_go = cinfo->restart_interval;
707   for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
709     ci = cinfo->MCU_membership[blkn];
710     compptr = cinfo->cur_comp_info[ci];
721       arith_encode(cinfo, st, 0);
725       arith_encode(cinfo, st, 1);
729         arith_encode(cinfo, st + 1, 0); /* Table F.4: SS = S0 + 1 */
734         arith_encode(cinfo, st + 1, 1); /* Table F.4: SS = S0 + 1 */
741         arith_encode(cinfo, st, 1);
746           arith_encode(cinfo, st, 1);
751       arith_encode(cinfo, st, 0);
753       if (m < (int)((1L << cinfo->arith_dc_L[tbl]) >> 1))
755       else if (m > (int)((1L << cinfo->arith_dc_U[tbl]) >> 1))
760         arith_encode(cinfo, st, (m & v) ? 1 : 0);
774       arith_encode(cinfo, st, 0);       /* EOB decision */
776         arith_encode(cinfo, st + 1, 0);  st += 3;  k++;
778       arith_encode(cinfo, st + 1, 1);
782         arith_encode(cinfo, entropy->fixed_bin, 0);
785         arith_encode(cinfo, entropy->fixed_bin, 1);
791         arith_encode(cinfo, st, 1);
795           arith_encode(cinfo, st, 1);
798                (k <= cinfo->arith_ac_K[tbl] ? 189 : 217);
800             arith_encode(cinfo, st, 1);
806       arith_encode(cinfo, st, 0);
810         arith_encode(cinfo, st, (m & v) ? 1 : 0);
815       arith_encode(cinfo, st, 1);
828 start_pass(j_compress_ptr cinfo, boolean gather_statistics)
830   arith_entropy_ptr entropy = (arith_entropy_ptr)cinfo->entropy;
839     ERREXIT(cinfo, JERR_NOT_COMPILED);
844   if (cinfo->progressive_mode) {
845     if (cinfo->Ah == 0) {
846       if (cinfo->Ss == 0)
851       if (cinfo->Ss == 0)
860   for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
861     compptr = cinfo->cur_comp_info[ci];
863     if (cinfo->progressive_mode == 0 || (cinfo->Ss == 0 && cinfo->Ah == 0)) {
866         ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
868         entropy->dc_stats[tbl] = (unsigned char *)(*cinfo->mem->alloc_small)
869           ((j_common_ptr)cinfo, JPOOL_IMAGE, DC_STAT_BINS);
876     if (cinfo->progressive_mode == 0 || cinfo->Se) {
879         ERREXIT1(cinfo, JERR_NO_ARITH_TABLE, tbl);
881         entropy->ac_stats[tbl] = (unsigned char *)(*cinfo->mem->alloc_small)
882           ((j_common_ptr)cinfo, JPOOL_IMAGE, AC_STAT_BINS);
885       if (cinfo->progressive_mode)
887         cinfo->arith_ac_K[tbl] = cinfo->Ss +
888                                  ((8 + cinfo->Se - cinfo->Ss) >> 4);
902   entropy->restarts_to_go = cinfo->restart_interval;
912 jinit_arith_encoder(j_compress_ptr cinfo)
918     (*cinfo->mem->alloc_small) ((j_common_ptr)cinfo, JPOOL_IMAGE,
920   cinfo->entropy = (struct jpeg_entropy_encoder *)entropy;

Indexes created Thu Nov 07 10:32:03 CST 2024