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1 /* | 1 /* |
2 * jdcoefct.h | 2 * jdcoefct.h |
3 * | 3 * |
4 * This file was part of the Independent JPEG Group's software: | 4 * This file was part of the Independent JPEG Group's software: |
5 * Copyright (C) 1994-1997, Thomas G. Lane. | 5 * Copyright (C) 1994-1997, Thomas G. Lane. |
6 * libjpeg-turbo Modifications: | 6 * libjpeg-turbo Modifications: |
7 * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB | 7 * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB |
8 * For conditions of distribution and use, see the accompanying README file. | 8 * For conditions of distribution and use, see the accompanying README.ijg |
| 9 * file. |
9 */ | 10 */ |
10 | 11 |
11 #define JPEG_INTERNALS | 12 #define JPEG_INTERNALS |
12 #include "jinclude.h" | |
13 #include "jpeglib.h" | 13 #include "jpeglib.h" |
14 | 14 |
15 | 15 |
16 /* Block smoothing is only applicable for progressive JPEG, so: */ | 16 /* Block smoothing is only applicable for progressive JPEG, so: */ |
17 #ifndef D_PROGRESSIVE_SUPPORTED | 17 #ifndef D_PROGRESSIVE_SUPPORTED |
18 #undef BLOCK_SMOOTHING_SUPPORTED | 18 #undef BLOCK_SMOOTHING_SUPPORTED |
19 #endif | 19 #endif |
20 | 20 |
21 | 21 |
22 /* Private buffer controller object */ | 22 /* Private buffer controller object */ |
(...skipping 11 matching lines...) Expand all Loading... |
34 | 34 |
35 /* In single-pass modes, it's sufficient to buffer just one MCU. | 35 /* In single-pass modes, it's sufficient to buffer just one MCU. |
36 * We allocate a workspace of D_MAX_BLOCKS_IN_MCU coefficient blocks, | 36 * We allocate a workspace of D_MAX_BLOCKS_IN_MCU coefficient blocks, |
37 * and let the entropy decoder write into that workspace each time. | 37 * and let the entropy decoder write into that workspace each time. |
38 * In multi-pass modes, this array points to the current MCU's blocks | 38 * In multi-pass modes, this array points to the current MCU's blocks |
39 * within the virtual arrays; it is used only by the input side. | 39 * within the virtual arrays; it is used only by the input side. |
40 */ | 40 */ |
41 JBLOCKROW MCU_buffer[D_MAX_BLOCKS_IN_MCU]; | 41 JBLOCKROW MCU_buffer[D_MAX_BLOCKS_IN_MCU]; |
42 | 42 |
43 /* Temporary workspace for one MCU */ | 43 /* Temporary workspace for one MCU */ |
44 JCOEF * workspace; | 44 JCOEF *workspace; |
45 | 45 |
46 #ifdef D_MULTISCAN_FILES_SUPPORTED | 46 #ifdef D_MULTISCAN_FILES_SUPPORTED |
47 /* In multi-pass modes, we need a virtual block array for each component. */ | 47 /* In multi-pass modes, we need a virtual block array for each component. */ |
48 jvirt_barray_ptr whole_image[MAX_COMPONENTS]; | 48 jvirt_barray_ptr whole_image[MAX_COMPONENTS]; |
49 #endif | 49 #endif |
50 | 50 |
51 #ifdef BLOCK_SMOOTHING_SUPPORTED | 51 #ifdef BLOCK_SMOOTHING_SUPPORTED |
52 /* When doing block smoothing, we latch coefficient Al values here */ | 52 /* When doing block smoothing, we latch coefficient Al values here */ |
53 int * coef_bits_latch; | 53 int *coef_bits_latch; |
54 #define SAVED_COEFS 6 /* we save coef_bits[0..5] */ | 54 #define SAVED_COEFS 6 /* we save coef_bits[0..5] */ |
55 #endif | 55 #endif |
56 } my_coef_controller; | 56 } my_coef_controller; |
57 | 57 |
58 typedef my_coef_controller * my_coef_ptr; | 58 typedef my_coef_controller *my_coef_ptr; |
59 | 59 |
60 | 60 |
61 LOCAL(void) | 61 LOCAL(void) |
62 start_iMCU_row (j_decompress_ptr cinfo) | 62 start_iMCU_row (j_decompress_ptr cinfo) |
63 /* Reset within-iMCU-row counters for a new row (input side) */ | 63 /* Reset within-iMCU-row counters for a new row (input side) */ |
64 { | 64 { |
65 my_coef_ptr coef = (my_coef_ptr) cinfo->coef; | 65 my_coef_ptr coef = (my_coef_ptr) cinfo->coef; |
66 | 66 |
67 /* In an interleaved scan, an MCU row is the same as an iMCU row. | 67 /* In an interleaved scan, an MCU row is the same as an iMCU row. |
68 * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows. | 68 * In a noninterleaved scan, an iMCU row has v_samp_factor MCU rows. |
69 * But at the bottom of the image, process only what's left. | 69 * But at the bottom of the image, process only what's left. |
70 */ | 70 */ |
71 if (cinfo->comps_in_scan > 1) { | 71 if (cinfo->comps_in_scan > 1) { |
72 coef->MCU_rows_per_iMCU_row = 1; | 72 coef->MCU_rows_per_iMCU_row = 1; |
73 } else { | 73 } else { |
74 if (cinfo->input_iMCU_row < (cinfo->total_iMCU_rows-1)) | 74 if (cinfo->input_iMCU_row < (cinfo->total_iMCU_rows-1)) |
75 coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor; | 75 coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->v_samp_factor; |
76 else | 76 else |
77 coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height; | 77 coef->MCU_rows_per_iMCU_row = cinfo->cur_comp_info[0]->last_row_height; |
78 } | 78 } |
79 | 79 |
80 coef->MCU_ctr = 0; | 80 coef->MCU_ctr = 0; |
81 coef->MCU_vert_offset = 0; | 81 coef->MCU_vert_offset = 0; |
82 } | 82 } |
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