/src/libjpeg-turbo/jdmainct.h
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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. |
6 | | * libjpeg-turbo Modifications: |
7 | | * Copyright (C) 2022, D. R. Commander. |
8 | | * For conditions of distribution and use, see the accompanying README.ijg |
9 | | * file. |
10 | | */ |
11 | | |
12 | | #define JPEG_INTERNALS |
13 | | #include "jpeglib.h" |
14 | | #include "jpegapicomp.h" |
15 | | #include "jsamplecomp.h" |
16 | | |
17 | | |
18 | | #if BITS_IN_JSAMPLE != 16 || defined(D_LOSSLESS_SUPPORTED) |
19 | | |
20 | | /* Private buffer controller object */ |
21 | | |
22 | | typedef struct { |
23 | | struct jpeg_d_main_controller pub; /* public fields */ |
24 | | |
25 | | /* Pointer to allocated workspace (M or M+2 row groups). */ |
26 | | _JSAMPARRAY buffer[MAX_COMPONENTS]; |
27 | | |
28 | | boolean buffer_full; /* Have we gotten an iMCU row from decoder? */ |
29 | | JDIMENSION rowgroup_ctr; /* counts row groups output to postprocessor */ |
30 | | |
31 | | /* Remaining fields are only used in the context case. */ |
32 | | |
33 | | /* These are the master pointers to the funny-order pointer lists. */ |
34 | | _JSAMPIMAGE xbuffer[2]; /* pointers to weird pointer lists */ |
35 | | |
36 | | int whichptr; /* indicates which pointer set is now in use */ |
37 | | int context_state; /* process_data state machine status */ |
38 | | JDIMENSION rowgroups_avail; /* row groups available to postprocessor */ |
39 | | JDIMENSION iMCU_row_ctr; /* counts iMCU rows to detect image top/bot */ |
40 | | } my_main_controller; |
41 | | |
42 | | typedef my_main_controller *my_main_ptr; |
43 | | |
44 | | |
45 | | /* context_state values: */ |
46 | 0 | #define CTX_PREPARE_FOR_IMCU 0 /* need to prepare for MCU row */ |
47 | 0 | #define CTX_PROCESS_IMCU 1 /* feeding iMCU to postprocessor */ |
48 | 0 | #define CTX_POSTPONED_ROW 2 /* feeding postponed row group */ |
49 | | |
50 | | |
51 | | LOCAL(void) |
52 | | set_wraparound_pointers(j_decompress_ptr cinfo) |
53 | | /* Set up the "wraparound" pointers at top and bottom of the pointer lists. |
54 | | * This changes the pointer list state from top-of-image to the normal state. |
55 | | */ |
56 | 0 | { |
57 | 0 | my_main_ptr main_ptr = (my_main_ptr)cinfo->main; |
58 | 0 | int ci, i, rgroup; |
59 | 0 | int M = cinfo->_min_DCT_scaled_size; |
60 | 0 | jpeg_component_info *compptr; |
61 | 0 | _JSAMPARRAY xbuf0, xbuf1; |
62 | |
|
63 | 0 | for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; |
64 | 0 | ci++, compptr++) { |
65 | 0 | rgroup = (compptr->v_samp_factor * compptr->_DCT_scaled_size) / |
66 | 0 | cinfo->_min_DCT_scaled_size; /* height of a row group of component */ |
67 | 0 | xbuf0 = main_ptr->xbuffer[0][ci]; |
68 | 0 | xbuf1 = main_ptr->xbuffer[1][ci]; |
69 | 0 | for (i = 0; i < rgroup; i++) { |
70 | 0 | xbuf0[i - rgroup] = xbuf0[rgroup * (M + 1) + i]; |
71 | 0 | xbuf1[i - rgroup] = xbuf1[rgroup * (M + 1) + i]; |
72 | 0 | xbuf0[rgroup * (M + 2) + i] = xbuf0[i]; |
73 | 0 | xbuf1[rgroup * (M + 2) + i] = xbuf1[i]; |
74 | 0 | } |
75 | 0 | } |
76 | 0 | } Unexecuted instantiation: jdapistd.c:set_wraparound_pointers Unexecuted instantiation: jdmainct.c:set_wraparound_pointers |
77 | | |
78 | | #endif /* BITS_IN_JSAMPLE != 16 || defined(D_LOSSLESS_SUPPORTED) */ |