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1 /* | 1 /* |
2 * jdtrans.c | 2 * jdtrans.c |
3 * | 3 * |
| 4 * This file was part of the Independent JPEG Group's software: |
4 * Copyright (C) 1995-1997, Thomas G. Lane. | 5 * Copyright (C) 1995-1997, Thomas G. Lane. |
5 * This file is part of the Independent JPEG Group's software. | 6 * It was modified by The libjpeg-turbo Project to include only code relevant |
6 * For conditions of distribution and use, see the accompanying README file. | 7 * to libjpeg-turbo. |
| 8 * For conditions of distribution and use, see the accompanying README.ijg |
| 9 * file. |
7 * | 10 * |
8 * This file contains library routines for transcoding decompression, | 11 * This file contains library routines for transcoding decompression, |
9 * that is, reading raw DCT coefficient arrays from an input JPEG file. | 12 * that is, reading raw DCT coefficient arrays from an input JPEG file. |
10 * The routines in jdapimin.c will also be needed by a transcoder. | 13 * The routines in jdapimin.c will also be needed by a transcoder. |
11 */ | 14 */ |
12 | 15 |
13 #define JPEG_INTERNALS | 16 #define JPEG_INTERNALS |
14 #include "jinclude.h" | 17 #include "jinclude.h" |
15 #include "jpeglib.h" | 18 #include "jpeglib.h" |
16 | 19 |
17 | 20 |
18 /* Forward declarations */ | 21 /* Forward declarations */ |
19 LOCAL(void) transdecode_master_selection JPP((j_decompress_ptr cinfo)); | 22 LOCAL(void) transdecode_master_selection (j_decompress_ptr cinfo); |
20 | 23 |
21 | 24 |
22 /* | 25 /* |
23 * Read the coefficient arrays from a JPEG file. | 26 * Read the coefficient arrays from a JPEG file. |
24 * jpeg_read_header must be completed before calling this. | 27 * jpeg_read_header must be completed before calling this. |
25 * | 28 * |
26 * The entire image is read into a set of virtual coefficient-block arrays, | 29 * The entire image is read into a set of virtual coefficient-block arrays, |
27 * one per component. The return value is a pointer to the array of | 30 * one per component. The return value is a pointer to the array of |
28 * virtual-array descriptors. These can be manipulated directly via the | 31 * virtual-array descriptors. These can be manipulated directly via the |
29 * JPEG memory manager, or handed off to jpeg_write_coefficients(). | 32 * JPEG memory manager, or handed off to jpeg_write_coefficients(). |
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48 /* First call: initialize active modules */ | 51 /* First call: initialize active modules */ |
49 transdecode_master_selection(cinfo); | 52 transdecode_master_selection(cinfo); |
50 cinfo->global_state = DSTATE_RDCOEFS; | 53 cinfo->global_state = DSTATE_RDCOEFS; |
51 } | 54 } |
52 if (cinfo->global_state == DSTATE_RDCOEFS) { | 55 if (cinfo->global_state == DSTATE_RDCOEFS) { |
53 /* Absorb whole file into the coef buffer */ | 56 /* Absorb whole file into the coef buffer */ |
54 for (;;) { | 57 for (;;) { |
55 int retcode; | 58 int retcode; |
56 /* Call progress monitor hook if present */ | 59 /* Call progress monitor hook if present */ |
57 if (cinfo->progress != NULL) | 60 if (cinfo->progress != NULL) |
58 » (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo); | 61 (*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo); |
59 /* Absorb some more input */ | 62 /* Absorb some more input */ |
60 retcode = (*cinfo->inputctl->consume_input) (cinfo); | 63 retcode = (*cinfo->inputctl->consume_input) (cinfo); |
61 if (retcode == JPEG_SUSPENDED) | 64 if (retcode == JPEG_SUSPENDED) |
62 » return NULL; | 65 return NULL; |
63 if (retcode == JPEG_REACHED_EOI) | 66 if (retcode == JPEG_REACHED_EOI) |
64 » break; | 67 break; |
65 /* Advance progress counter if appropriate */ | 68 /* Advance progress counter if appropriate */ |
66 if (cinfo->progress != NULL && | 69 if (cinfo->progress != NULL && |
67 » (retcode == JPEG_ROW_COMPLETED || retcode == JPEG_REACHED_SOS)) { | 70 (retcode == JPEG_ROW_COMPLETED || retcode == JPEG_REACHED_SOS)) { |
68 » if (++cinfo->progress->pass_counter >= cinfo->progress->pass_limit) { | 71 if (++cinfo->progress->pass_counter >= cinfo->progress->pass_limit) { |
69 » /* startup underestimated number of scans; ratchet up one scan */ | 72 /* startup underestimated number of scans; ratchet up one scan */ |
70 » cinfo->progress->pass_limit += (long) cinfo->total_iMCU_rows; | 73 cinfo->progress->pass_limit += (long) cinfo->total_iMCU_rows; |
71 » } | 74 } |
72 } | 75 } |
73 } | 76 } |
74 /* Set state so that jpeg_finish_decompress does the right thing */ | 77 /* Set state so that jpeg_finish_decompress does the right thing */ |
75 cinfo->global_state = DSTATE_STOPPING; | 78 cinfo->global_state = DSTATE_STOPPING; |
76 } | 79 } |
77 /* At this point we should be in state DSTATE_STOPPING if being used | 80 /* At this point we should be in state DSTATE_STOPPING if being used |
78 * standalone, or in state DSTATE_BUFIMAGE if being invoked to get access | 81 * standalone, or in state DSTATE_BUFIMAGE if being invoked to get access |
79 * to the coefficients during a full buffered-image-mode decompression. | 82 * to the coefficients during a full buffered-image-mode decompression. |
80 */ | 83 */ |
81 if ((cinfo->global_state == DSTATE_STOPPING || | 84 if ((cinfo->global_state == DSTATE_STOPPING || |
82 cinfo->global_state == DSTATE_BUFIMAGE) && cinfo->buffered_image) { | 85 cinfo->global_state == DSTATE_BUFIMAGE) && cinfo->buffered_image) { |
83 return cinfo->coef->coef_arrays; | 86 return cinfo->coef->coef_arrays; |
84 } | 87 } |
85 /* Oops, improper usage */ | 88 /* Oops, improper usage */ |
86 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); | 89 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); |
87 return NULL;» » » /* keep compiler happy */ | 90 return NULL; /* keep compiler happy */ |
88 } | 91 } |
89 | 92 |
90 | 93 |
91 /* | 94 /* |
92 * Master selection of decompression modules for transcoding. | 95 * Master selection of decompression modules for transcoding. |
93 * This substitutes for jdmaster.c's initialization of the full decompressor. | 96 * This substitutes for jdmaster.c's initialization of the full decompressor. |
94 */ | 97 */ |
95 | 98 |
96 LOCAL(void) | 99 LOCAL(void) |
97 transdecode_master_selection (j_decompress_ptr cinfo) | 100 transdecode_master_selection (j_decompress_ptr cinfo) |
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143 nscans = cinfo->num_components; | 146 nscans = cinfo->num_components; |
144 } else { | 147 } else { |
145 nscans = 1; | 148 nscans = 1; |
146 } | 149 } |
147 cinfo->progress->pass_counter = 0L; | 150 cinfo->progress->pass_counter = 0L; |
148 cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows * nscans; | 151 cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows * nscans; |
149 cinfo->progress->completed_passes = 0; | 152 cinfo->progress->completed_passes = 0; |
150 cinfo->progress->total_passes = 1; | 153 cinfo->progress->total_passes = 1; |
151 } | 154 } |
152 } | 155 } |
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