DRC | eb32cc1 | 2015-06-25 03:44:36 +0000 | [diff] [blame] | 1 | /* |
| 2 | * jdmainct.h |
| 3 | * |
| 4 | * This file was part of the Independent JPEG Group's software: |
| 5 | * Copyright (C) 1994-1996, Thomas G. Lane. |
DRC | 7e3acc0 | 2015-10-10 10:25:46 -0500 | [diff] [blame] | 6 | * For conditions of distribution and use, see the accompanying README.ijg |
| 7 | * file. |
DRC | eb32cc1 | 2015-06-25 03:44:36 +0000 | [diff] [blame] | 8 | */ |
| 9 | |
| 10 | #define JPEG_INTERNALS |
DRC | eb32cc1 | 2015-06-25 03:44:36 +0000 | [diff] [blame] | 11 | #include "jpeglib.h" |
| 12 | #include "jpegcomp.h" |
| 13 | |
| 14 | |
| 15 | /* Private buffer controller object */ |
| 16 | |
| 17 | typedef struct { |
| 18 | struct jpeg_d_main_controller pub; /* public fields */ |
| 19 | |
| 20 | /* Pointer to allocated workspace (M or M+2 row groups). */ |
| 21 | JSAMPARRAY buffer[MAX_COMPONENTS]; |
| 22 | |
| 23 | boolean buffer_full; /* Have we gotten an iMCU row from decoder? */ |
| 24 | JDIMENSION rowgroup_ctr; /* counts row groups output to postprocessor */ |
| 25 | |
| 26 | /* Remaining fields are only used in the context case. */ |
| 27 | |
| 28 | /* These are the master pointers to the funny-order pointer lists. */ |
| 29 | JSAMPIMAGE xbuffer[2]; /* pointers to weird pointer lists */ |
| 30 | |
| 31 | int whichptr; /* indicates which pointer set is now in use */ |
| 32 | int context_state; /* process_data state machine status */ |
| 33 | JDIMENSION rowgroups_avail; /* row groups available to postprocessor */ |
| 34 | JDIMENSION iMCU_row_ctr; /* counts iMCU rows to detect image top/bot */ |
| 35 | } my_main_controller; |
| 36 | |
DRC | bd49803 | 2016-02-19 08:53:33 -0600 | [diff] [blame] | 37 | typedef my_main_controller *my_main_ptr; |
DRC | eb32cc1 | 2015-06-25 03:44:36 +0000 | [diff] [blame] | 38 | |
| 39 | |
| 40 | /* context_state values: */ |
| 41 | #define CTX_PREPARE_FOR_IMCU 0 /* need to prepare for MCU row */ |
| 42 | #define CTX_PROCESS_IMCU 1 /* feeding iMCU to postprocessor */ |
| 43 | #define CTX_POSTPONED_ROW 2 /* feeding postponed row group */ |
| 44 | |
| 45 | |
| 46 | LOCAL(void) |
DRC | 19c791c | 2018-03-08 10:55:20 -0600 | [diff] [blame] | 47 | set_wraparound_pointers(j_decompress_ptr cinfo) |
DRC | eb32cc1 | 2015-06-25 03:44:36 +0000 | [diff] [blame] | 48 | /* Set up the "wraparound" pointers at top and bottom of the pointer lists. |
| 49 | * This changes the pointer list state from top-of-image to the normal state. |
| 50 | */ |
| 51 | { |
DRC | 19c791c | 2018-03-08 10:55:20 -0600 | [diff] [blame] | 52 | my_main_ptr main_ptr = (my_main_ptr)cinfo->main; |
DRC | eb32cc1 | 2015-06-25 03:44:36 +0000 | [diff] [blame] | 53 | int ci, i, rgroup; |
| 54 | int M = cinfo->_min_DCT_scaled_size; |
| 55 | jpeg_component_info *compptr; |
| 56 | JSAMPARRAY xbuf0, xbuf1; |
| 57 | |
| 58 | for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
| 59 | ci++, compptr++) { |
| 60 | rgroup = (compptr->v_samp_factor * compptr->_DCT_scaled_size) / |
| 61 | cinfo->_min_DCT_scaled_size; /* height of a row group of component */ |
| 62 | xbuf0 = main_ptr->xbuffer[0][ci]; |
| 63 | xbuf1 = main_ptr->xbuffer[1][ci]; |
| 64 | for (i = 0; i < rgroup; i++) { |
DRC | 19c791c | 2018-03-08 10:55:20 -0600 | [diff] [blame] | 65 | xbuf0[i - rgroup] = xbuf0[rgroup * (M + 1) + i]; |
| 66 | xbuf1[i - rgroup] = xbuf1[rgroup * (M + 1) + i]; |
| 67 | xbuf0[rgroup * (M + 2) + i] = xbuf0[i]; |
| 68 | xbuf1[rgroup * (M + 2) + i] = xbuf1[i]; |
DRC | eb32cc1 | 2015-06-25 03:44:36 +0000 | [diff] [blame] | 69 | } |
| 70 | } |
| 71 | } |