/src/libjpeg-turbo.2.1.x/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 | | * For conditions of distribution and use, see the accompanying README.ijg |
10 | | * file. |
11 | | */ |
12 | | |
13 | | #define JPEG_INTERNALS |
14 | | #include "jpeglib.h" |
15 | | |
16 | | |
17 | | /* Block smoothing is only applicable for progressive JPEG, so: */ |
18 | | #ifndef D_PROGRESSIVE_SUPPORTED |
19 | | #undef BLOCK_SMOOTHING_SUPPORTED |
20 | | #endif |
21 | | |
22 | | |
23 | | /* Private buffer controller object */ |
24 | | |
25 | | typedef struct { |
26 | | struct jpeg_d_coef_controller pub; /* public fields */ |
27 | | |
28 | | /* These variables keep track of the current location of the input side. */ |
29 | | /* cinfo->input_iMCU_row is also used for this. */ |
30 | | JDIMENSION MCU_ctr; /* counts MCUs processed in current row */ |
31 | | int MCU_vert_offset; /* counts MCU rows within iMCU row */ |
32 | | int MCU_rows_per_iMCU_row; /* number of such rows needed */ |
33 | | |
34 | | /* The output side's location is represented by cinfo->output_iMCU_row. */ |
35 | | |
36 | | /* In single-pass modes, it's sufficient to buffer just one MCU. |
37 | | * We allocate a workspace of D_MAX_BLOCKS_IN_MCU coefficient blocks, |
38 | | * and let the entropy decoder write into that workspace each time. |
39 | | * In multi-pass modes, this array points to the current MCU's blocks |
40 | | * within the virtual arrays; it is used only by the input side. |
41 | | */ |
42 | | JBLOCKROW MCU_buffer[D_MAX_BLOCKS_IN_MCU]; |
43 | | |
44 | | /* Temporary workspace for one MCU */ |
45 | | JCOEF *workspace; |
46 | | |
47 | | #ifdef D_MULTISCAN_FILES_SUPPORTED |
48 | | /* In multi-pass modes, we need a virtual block array for each component. */ |
49 | | jvirt_barray_ptr whole_image[MAX_COMPONENTS]; |
50 | | #endif |
51 | | |
52 | | #ifdef BLOCK_SMOOTHING_SUPPORTED |
53 | | /* When doing block smoothing, we latch coefficient Al values here */ |
54 | | int *coef_bits_latch; |
55 | 3.05M | #define SAVED_COEFS 10 /* we save coef_bits[0..9] */ |
56 | | #endif |
57 | | } my_coef_controller; |
58 | | |
59 | | typedef my_coef_controller *my_coef_ptr; |
60 | | |
61 | | |
62 | | LOCAL(void) |
63 | | start_iMCU_row(j_decompress_ptr cinfo) |
64 | | /* Reset within-iMCU-row counters for a new row (input side) */ |
65 | 78.7M | { |
66 | 78.7M | my_coef_ptr coef = (my_coef_ptr)cinfo->coef; |
67 | | |
68 | | /* In an interleaved scan, an MCU row is the same as an iMCU row. |
69 | | * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows. |
70 | | * But at the bottom of the image, process only what's left. |
71 | | */ |
72 | 78.7M | if (cinfo->comps_in_scan > 1) { |
73 | 6.48M | coef->MCU_rows_per_iMCU_row = 1; |
74 | 72.2M | } else { |
75 | 72.2M | if (cinfo->input_iMCU_row < (cinfo->total_iMCU_rows - 1)) |
76 | 72.0M | coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor; |
77 | 181k | else |
78 | 181k | coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height; |
79 | 72.2M | } |
80 | | |
81 | 78.7M | coef->MCU_ctr = 0; |
82 | 78.7M | coef->MCU_vert_offset = 0; |
83 | 78.7M | } Unexecuted instantiation: jdapistd.c:start_iMCU_row jdcoefct.c:start_iMCU_row Line | Count | Source | 65 | 78.7M | { | 66 | 78.7M | my_coef_ptr coef = (my_coef_ptr)cinfo->coef; | 67 | | | 68 | | /* In an interleaved scan, an MCU row is the same as an iMCU row. | 69 | | * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows. | 70 | | * But at the bottom of the image, process only what's left. | 71 | | */ | 72 | 78.7M | if (cinfo->comps_in_scan > 1) { | 73 | 6.48M | coef->MCU_rows_per_iMCU_row = 1; | 74 | 72.2M | } else { | 75 | 72.2M | if (cinfo->input_iMCU_row < (cinfo->total_iMCU_rows - 1)) | 76 | 72.0M | coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor; | 77 | 181k | else | 78 | 181k | coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height; | 79 | 72.2M | } | 80 | | | 81 | 78.7M | coef->MCU_ctr = 0; | 82 | 78.7M | coef->MCU_vert_offset = 0; | 83 | 78.7M | } |
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