/src/libjpeg-turbo/src/jdcoefct.h
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1 | | /* |
2 | | * jdcoefct.h |
3 | | * |
4 | | * This file was part of the Independent JPEG Group's software: |
5 | | * Copyright (C) 1994-1997, Thomas G. Lane. |
6 | | * libjpeg-turbo Modifications: |
7 | | * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB |
8 | | * Copyright (C) 2020, Google, Inc. |
9 | | * Copyright (C) 2022, D. R. Commander. |
10 | | * For conditions of distribution and use, see the accompanying README.ijg |
11 | | * file. |
12 | | */ |
13 | | |
14 | | #define JPEG_INTERNALS |
15 | | #include "jpeglib.h" |
16 | | |
17 | | |
18 | | #if BITS_IN_JSAMPLE != 16 || defined(D_LOSSLESS_SUPPORTED) |
19 | | |
20 | | /* Block smoothing is only applicable for progressive JPEG, so: */ |
21 | | #ifndef D_PROGRESSIVE_SUPPORTED |
22 | | #undef BLOCK_SMOOTHING_SUPPORTED |
23 | | #endif |
24 | | |
25 | | |
26 | | /* Private buffer controller object */ |
27 | | |
28 | | typedef struct { |
29 | | struct jpeg_d_coef_controller pub; /* public fields */ |
30 | | |
31 | | /* These variables keep track of the current location of the input side. */ |
32 | | /* cinfo->input_iMCU_row is also used for this. */ |
33 | | JDIMENSION MCU_ctr; /* counts MCUs processed in current row */ |
34 | | int MCU_vert_offset; /* counts MCU rows within iMCU row */ |
35 | | int MCU_rows_per_iMCU_row; /* number of such rows needed */ |
36 | | |
37 | | /* The output side's location is represented by cinfo->output_iMCU_row. */ |
38 | | |
39 | | /* In single-pass modes, it's sufficient to buffer just one MCU. |
40 | | * We allocate a workspace of D_MAX_BLOCKS_IN_MCU coefficient blocks, |
41 | | * and let the entropy decoder write into that workspace each time. |
42 | | * In multi-pass modes, this array points to the current MCU's blocks |
43 | | * within the virtual arrays; it is used only by the input side. |
44 | | */ |
45 | | JBLOCKROW MCU_buffer[D_MAX_BLOCKS_IN_MCU]; |
46 | | |
47 | | /* Temporary workspace for one MCU */ |
48 | | JCOEF *workspace; |
49 | | |
50 | | #ifdef D_MULTISCAN_FILES_SUPPORTED |
51 | | /* In multi-pass modes, we need a virtual block array for each component. */ |
52 | | jvirt_barray_ptr whole_image[MAX_COMPONENTS]; |
53 | | #endif |
54 | | |
55 | | #ifdef BLOCK_SMOOTHING_SUPPORTED |
56 | | /* When doing block smoothing, we latch coefficient Al values here */ |
57 | | int *coef_bits_latch; |
58 | 2.14M | #define SAVED_COEFS 10 /* we save coef_bits[0..9] */ |
59 | | #endif |
60 | | } my_coef_controller; |
61 | | |
62 | | typedef my_coef_controller *my_coef_ptr; |
63 | | |
64 | | |
65 | | LOCAL(void) |
66 | | start_iMCU_row(j_decompress_ptr cinfo) |
67 | | /* Reset within-iMCU-row counters for a new row (input side) */ |
68 | 1.79M | { |
69 | 1.79M | my_coef_ptr coef = (my_coef_ptr)cinfo->coef; |
70 | | |
71 | | /* In an interleaved scan, an MCU row is the same as an iMCU row. |
72 | | * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows. |
73 | | * But at the bottom of the image, process only what's left. |
74 | | */ |
75 | 1.79M | if (cinfo->comps_in_scan > 1) { |
76 | 1.16M | coef->MCU_rows_per_iMCU_row = 1; |
77 | 1.16M | } else { |
78 | 627k | if (cinfo->input_iMCU_row < (cinfo->total_iMCU_rows - 1)) |
79 | 623k | coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor; |
80 | 4.84k | else |
81 | 4.84k | coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height; |
82 | 627k | } |
83 | | |
84 | 1.79M | coef->MCU_ctr = 0; |
85 | 1.79M | coef->MCU_vert_offset = 0; |
86 | 1.79M | } Unexecuted instantiation: jdapistd-8.c:start_iMCU_row jdcoefct-8.c:start_iMCU_row Line | Count | Source | 68 | 1.78M | { | 69 | 1.78M | my_coef_ptr coef = (my_coef_ptr)cinfo->coef; | 70 | | | 71 | | /* In an interleaved scan, an MCU row is the same as an iMCU row. | 72 | | * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows. | 73 | | * But at the bottom of the image, process only what's left. | 74 | | */ | 75 | 1.78M | if (cinfo->comps_in_scan > 1) { | 76 | 1.16M | coef->MCU_rows_per_iMCU_row = 1; | 77 | 1.16M | } else { | 78 | 625k | if (cinfo->input_iMCU_row < (cinfo->total_iMCU_rows - 1)) | 79 | 621k | coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor; | 80 | 4.81k | else | 81 | 4.81k | coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height; | 82 | 625k | } | 83 | | | 84 | 1.78M | coef->MCU_ctr = 0; | 85 | 1.78M | coef->MCU_vert_offset = 0; | 86 | 1.78M | } |
jdcoefct-12.c:start_iMCU_row Line | Count | Source | 68 | 7.50k | { | 69 | 7.50k | my_coef_ptr coef = (my_coef_ptr)cinfo->coef; | 70 | | | 71 | | /* In an interleaved scan, an MCU row is the same as an iMCU row. | 72 | | * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows. | 73 | | * But at the bottom of the image, process only what's left. | 74 | | */ | 75 | 7.50k | if (cinfo->comps_in_scan > 1) { | 76 | 5.52k | coef->MCU_rows_per_iMCU_row = 1; | 77 | 5.52k | } else { | 78 | 1.97k | if (cinfo->input_iMCU_row < (cinfo->total_iMCU_rows - 1)) | 79 | 1.95k | coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor; | 80 | 24 | else | 81 | 24 | coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height; | 82 | 1.97k | } | 83 | | | 84 | 7.50k | coef->MCU_ctr = 0; | 85 | 7.50k | coef->MCU_vert_offset = 0; | 86 | 7.50k | } |
|
87 | | |
88 | | #endif /* BITS_IN_JSAMPLE != 16 || defined(D_LOSSLESS_SUPPORTED) */ |