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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 6417 | ashmew2 | 1 | /* |
| 2 | * jpegint.h |
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| 3 | * |
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| 4 | * Copyright (C) 1991-1997, Thomas G. Lane. |
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| 5 | * This file is part of the Independent JPEG Group's software. |
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| 6 | * For conditions of distribution and use, see the accompanying README file. |
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| 7 | * |
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| 8 | * This file provides common declarations for the various JPEG modules. |
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| 9 | * These declarations are considered internal to the JPEG library; most |
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| 10 | * applications using the library shouldn't need to include this file. |
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| 11 | */ |
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| 12 | |||
| 13 | |||
| 14 | /* Declarations for both compression & decompression */ |
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| 15 | |||
| 16 | typedef enum { /* Operating modes for buffer controllers */ |
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| 17 | JBUF_PASS_THRU, /* Plain stripwise operation */ |
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| 18 | /* Remaining modes require a full-image buffer to have been created */ |
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| 19 | JBUF_SAVE_SOURCE, /* Run source subobject only, save output */ |
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| 20 | JBUF_CRANK_DEST, /* Run dest subobject only, using saved data */ |
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| 21 | JBUF_SAVE_AND_PASS /* Run both subobjects, save output */ |
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| 22 | } J_BUF_MODE; |
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| 23 | |||
| 24 | /* Values of global_state field (jdapi.c has some dependencies on ordering!) */ |
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| 25 | #define CSTATE_START 100 /* after create_compress */ |
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| 26 | #define CSTATE_SCANNING 101 /* start_compress done, write_scanlines OK */ |
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| 27 | #define CSTATE_RAW_OK 102 /* start_compress done, write_raw_data OK */ |
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| 28 | #define CSTATE_WRCOEFS 103 /* jpeg_write_coefficients done */ |
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| 29 | #define DSTATE_START 200 /* after create_decompress */ |
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| 30 | #define DSTATE_INHEADER 201 /* reading header markers, no SOS yet */ |
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| 31 | #define DSTATE_READY 202 /* found SOS, ready for start_decompress */ |
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| 32 | #define DSTATE_PRELOAD 203 /* reading multiscan file in start_decompress*/ |
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| 33 | #define DSTATE_PRESCAN 204 /* performing dummy pass for 2-pass quant */ |
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| 34 | #define DSTATE_SCANNING 205 /* start_decompress done, read_scanlines OK */ |
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| 35 | #define DSTATE_RAW_OK 206 /* start_decompress done, read_raw_data OK */ |
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| 36 | #define DSTATE_BUFIMAGE 207 /* expecting jpeg_start_output */ |
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| 37 | #define DSTATE_BUFPOST 208 /* looking for SOS/EOI in jpeg_finish_output */ |
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| 38 | #define DSTATE_RDCOEFS 209 /* reading file in jpeg_read_coefficients */ |
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| 39 | #define DSTATE_STOPPING 210 /* looking for EOI in jpeg_finish_decompress */ |
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| 40 | |||
| 41 | |||
| 42 | /* Declarations for compression modules */ |
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| 43 | |||
| 44 | /* Master control module */ |
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| 45 | struct jpeg_comp_master { |
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| 46 | JMETHOD(void, prepare_for_pass, (j_compress_ptr cinfo)); |
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| 47 | JMETHOD(void, pass_startup, (j_compress_ptr cinfo)); |
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| 48 | JMETHOD(void, finish_pass, (j_compress_ptr cinfo)); |
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| 49 | |||
| 50 | /* State variables made visible to other modules */ |
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| 51 | boolean call_pass_startup; /* True if pass_startup must be called */ |
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| 52 | boolean is_last_pass; /* True during last pass */ |
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| 53 | }; |
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| 54 | |||
| 55 | /* Main buffer control (downsampled-data buffer) */ |
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| 56 | struct jpeg_c_main_controller { |
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| 57 | JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode)); |
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| 58 | JMETHOD(void, process_data, (j_compress_ptr cinfo, |
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| 59 | JSAMPARRAY input_buf, JDIMENSION *in_row_ctr, |
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| 60 | JDIMENSION in_rows_avail)); |
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| 61 | }; |
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| 62 | |||
| 63 | /* Compression preprocessing (downsampling input buffer control) */ |
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| 64 | struct jpeg_c_prep_controller { |
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| 65 | JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode)); |
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| 66 | JMETHOD(void, pre_process_data, (j_compress_ptr cinfo, |
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| 67 | JSAMPARRAY input_buf, |
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| 68 | JDIMENSION *in_row_ctr, |
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| 69 | JDIMENSION in_rows_avail, |
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| 70 | JSAMPIMAGE output_buf, |
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| 71 | JDIMENSION *out_row_group_ctr, |
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| 72 | JDIMENSION out_row_groups_avail)); |
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| 73 | }; |
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| 74 | |||
| 75 | /* Coefficient buffer control */ |
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| 76 | struct jpeg_c_coef_controller { |
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| 77 | JMETHOD(void, start_pass, (j_compress_ptr cinfo, J_BUF_MODE pass_mode)); |
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| 78 | JMETHOD(boolean, compress_data, (j_compress_ptr cinfo, |
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| 79 | JSAMPIMAGE input_buf)); |
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| 80 | }; |
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| 81 | |||
| 82 | /* Colorspace conversion */ |
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| 83 | struct jpeg_color_converter { |
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| 84 | JMETHOD(void, start_pass, (j_compress_ptr cinfo)); |
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| 85 | JMETHOD(void, color_convert, (j_compress_ptr cinfo, |
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| 86 | JSAMPARRAY input_buf, JSAMPIMAGE output_buf, |
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| 87 | JDIMENSION output_row, int num_rows)); |
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| 88 | }; |
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| 89 | |||
| 90 | /* Downsampling */ |
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| 91 | struct jpeg_downsampler { |
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| 92 | JMETHOD(void, start_pass, (j_compress_ptr cinfo)); |
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| 93 | JMETHOD(void, downsample, (j_compress_ptr cinfo, |
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| 94 | JSAMPIMAGE input_buf, JDIMENSION in_row_index, |
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| 95 | JSAMPIMAGE output_buf, |
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| 96 | JDIMENSION out_row_group_index)); |
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| 97 | |||
| 98 | boolean need_context_rows; /* TRUE if need rows above & below */ |
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| 99 | }; |
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| 100 | |||
| 101 | /* Forward DCT (also controls coefficient quantization) */ |
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| 102 | struct jpeg_forward_dct { |
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| 103 | JMETHOD(void, start_pass, (j_compress_ptr cinfo)); |
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| 104 | /* perhaps this should be an array??? */ |
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| 105 | JMETHOD(void, forward_DCT, (j_compress_ptr cinfo, |
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| 106 | jpeg_component_info * compptr, |
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| 107 | JSAMPARRAY sample_data, JBLOCKROW coef_blocks, |
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| 108 | JDIMENSION start_row, JDIMENSION start_col, |
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| 109 | JDIMENSION num_blocks)); |
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| 110 | }; |
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| 111 | |||
| 112 | /* Entropy encoding */ |
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| 113 | struct jpeg_entropy_encoder { |
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| 114 | JMETHOD(void, start_pass, (j_compress_ptr cinfo, boolean gather_statistics)); |
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| 115 | JMETHOD(boolean, encode_mcu, (j_compress_ptr cinfo, JBLOCKROW *MCU_data)); |
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| 116 | JMETHOD(void, finish_pass, (j_compress_ptr cinfo)); |
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| 117 | }; |
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| 118 | |||
| 119 | /* Marker writing */ |
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| 120 | struct jpeg_marker_writer { |
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| 121 | JMETHOD(void, write_file_header, (j_compress_ptr cinfo)); |
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| 122 | JMETHOD(void, write_frame_header, (j_compress_ptr cinfo)); |
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| 123 | JMETHOD(void, write_scan_header, (j_compress_ptr cinfo)); |
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| 124 | JMETHOD(void, write_file_trailer, (j_compress_ptr cinfo)); |
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| 125 | JMETHOD(void, write_tables_only, (j_compress_ptr cinfo)); |
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| 126 | /* These routines are exported to allow insertion of extra markers */ |
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| 127 | /* Probably only COM and APPn markers should be written this way */ |
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| 128 | JMETHOD(void, write_marker_header, (j_compress_ptr cinfo, int marker, |
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| 129 | unsigned int datalen)); |
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| 130 | JMETHOD(void, write_marker_byte, (j_compress_ptr cinfo, int val)); |
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| 131 | }; |
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| 132 | |||
| 133 | |||
| 134 | /* Declarations for decompression modules */ |
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| 135 | |||
| 136 | /* Master control module */ |
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| 137 | struct jpeg_decomp_master { |
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| 138 | JMETHOD(void, prepare_for_output_pass, (j_decompress_ptr cinfo)); |
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| 139 | JMETHOD(void, finish_output_pass, (j_decompress_ptr cinfo)); |
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| 140 | |||
| 141 | /* State variables made visible to other modules */ |
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| 142 | boolean is_dummy_pass; /* True during 1st pass for 2-pass quant */ |
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| 143 | }; |
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| 144 | |||
| 145 | /* Input control module */ |
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| 146 | struct jpeg_input_controller { |
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| 147 | JMETHOD(int, consume_input, (j_decompress_ptr cinfo)); |
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| 148 | JMETHOD(void, reset_input_controller, (j_decompress_ptr cinfo)); |
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| 149 | JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo)); |
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| 150 | JMETHOD(void, finish_input_pass, (j_decompress_ptr cinfo)); |
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| 151 | |||
| 152 | /* State variables made visible to other modules */ |
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| 153 | boolean has_multiple_scans; /* True if file has multiple scans */ |
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| 154 | boolean eoi_reached; /* True when EOI has been consumed */ |
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| 155 | }; |
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| 156 | |||
| 157 | /* Main buffer control (downsampled-data buffer) */ |
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| 158 | struct jpeg_d_main_controller { |
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| 159 | JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode)); |
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| 160 | JMETHOD(void, process_data, (j_decompress_ptr cinfo, |
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| 161 | JSAMPARRAY output_buf, JDIMENSION *out_row_ctr, |
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| 162 | JDIMENSION out_rows_avail)); |
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| 163 | }; |
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| 164 | |||
| 165 | /* Coefficient buffer control */ |
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| 166 | struct jpeg_d_coef_controller { |
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| 167 | JMETHOD(void, start_input_pass, (j_decompress_ptr cinfo)); |
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| 168 | JMETHOD(int, consume_data, (j_decompress_ptr cinfo)); |
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| 169 | JMETHOD(void, start_output_pass, (j_decompress_ptr cinfo)); |
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| 170 | JMETHOD(int, decompress_data, (j_decompress_ptr cinfo, |
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| 171 | JSAMPIMAGE output_buf)); |
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| 172 | /* Pointer to array of coefficient virtual arrays, or NULL if none */ |
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| 173 | jvirt_barray_ptr *coef_arrays; |
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| 174 | }; |
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| 175 | |||
| 176 | /* Decompression postprocessing (color quantization buffer control) */ |
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| 177 | struct jpeg_d_post_controller { |
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| 178 | JMETHOD(void, start_pass, (j_decompress_ptr cinfo, J_BUF_MODE pass_mode)); |
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| 179 | JMETHOD(void, post_process_data, (j_decompress_ptr cinfo, |
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| 180 | JSAMPIMAGE input_buf, |
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| 181 | JDIMENSION *in_row_group_ctr, |
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| 182 | JDIMENSION in_row_groups_avail, |
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| 183 | JSAMPARRAY output_buf, |
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| 184 | JDIMENSION *out_row_ctr, |
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| 185 | JDIMENSION out_rows_avail)); |
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| 186 | }; |
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| 187 | |||
| 188 | /* Marker reading & parsing */ |
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| 189 | struct jpeg_marker_reader { |
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| 190 | JMETHOD(void, reset_marker_reader, (j_decompress_ptr cinfo)); |
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| 191 | /* Read markers until SOS or EOI. |
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| 192 | * Returns same codes as are defined for jpeg_consume_input: |
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| 193 | * JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI. |
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| 194 | */ |
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| 195 | JMETHOD(int, read_markers, (j_decompress_ptr cinfo)); |
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| 196 | /* Read a restart marker --- exported for use by entropy decoder only */ |
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| 197 | jpeg_marker_parser_method read_restart_marker; |
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| 198 | |||
| 199 | /* State of marker reader --- nominally internal, but applications |
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| 200 | * supplying COM or APPn handlers might like to know the state. |
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| 201 | */ |
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| 202 | boolean saw_SOI; /* found SOI? */ |
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| 203 | boolean saw_SOF; /* found SOF? */ |
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| 204 | int next_restart_num; /* next restart number expected (0-7) */ |
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| 205 | unsigned int discarded_bytes; /* # of bytes skipped looking for a marker */ |
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| 206 | }; |
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| 207 | |||
| 208 | /* Entropy decoding */ |
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| 209 | struct jpeg_entropy_decoder { |
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| 210 | JMETHOD(void, start_pass, (j_decompress_ptr cinfo)); |
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| 211 | JMETHOD(boolean, decode_mcu, (j_decompress_ptr cinfo, |
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| 212 | JBLOCKROW *MCU_data)); |
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| 213 | |||
| 214 | /* This is here to share code between baseline and progressive decoders; */ |
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| 215 | /* other modules probably should not use it */ |
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| 216 | boolean insufficient_data; /* set TRUE after emitting warning */ |
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| 217 | }; |
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| 218 | |||
| 219 | /* Inverse DCT (also performs dequantization) */ |
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| 220 | typedef JMETHOD(void, inverse_DCT_method_ptr, |
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| 221 | (j_decompress_ptr cinfo, jpeg_component_info * compptr, |
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| 222 | JCOEFPTR coef_block, |
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| 223 | JSAMPARRAY output_buf, JDIMENSION output_col)); |
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| 224 | |||
| 225 | struct jpeg_inverse_dct { |
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| 226 | JMETHOD(void, start_pass, (j_decompress_ptr cinfo)); |
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| 227 | /* It is useful to allow each component to have a separate IDCT method. */ |
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| 228 | inverse_DCT_method_ptr inverse_DCT[MAX_COMPONENTS]; |
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| 229 | }; |
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| 230 | |||
| 231 | /* Upsampling (note that upsampler must also call color converter) */ |
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| 232 | struct jpeg_upsampler { |
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| 233 | JMETHOD(void, start_pass, (j_decompress_ptr cinfo)); |
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| 234 | JMETHOD(void, upsample, (j_decompress_ptr cinfo, |
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| 235 | JSAMPIMAGE input_buf, |
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| 236 | JDIMENSION *in_row_group_ctr, |
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| 237 | JDIMENSION in_row_groups_avail, |
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| 238 | JSAMPARRAY output_buf, |
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| 239 | JDIMENSION *out_row_ctr, |
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| 240 | JDIMENSION out_rows_avail)); |
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| 241 | |||
| 242 | boolean need_context_rows; /* TRUE if need rows above & below */ |
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| 243 | }; |
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| 244 | |||
| 245 | /* Colorspace conversion */ |
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| 246 | struct jpeg_color_deconverter { |
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| 247 | JMETHOD(void, start_pass, (j_decompress_ptr cinfo)); |
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| 248 | JMETHOD(void, color_convert, (j_decompress_ptr cinfo, |
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| 249 | JSAMPIMAGE input_buf, JDIMENSION input_row, |
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| 250 | JSAMPARRAY output_buf, int num_rows)); |
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| 251 | }; |
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| 252 | |||
| 253 | /* Color quantization or color precision reduction */ |
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| 254 | struct jpeg_color_quantizer { |
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| 255 | JMETHOD(void, start_pass, (j_decompress_ptr cinfo, boolean is_pre_scan)); |
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| 256 | JMETHOD(void, color_quantize, (j_decompress_ptr cinfo, |
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| 257 | JSAMPARRAY input_buf, JSAMPARRAY output_buf, |
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| 258 | int num_rows)); |
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| 259 | JMETHOD(void, finish_pass, (j_decompress_ptr cinfo)); |
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| 260 | JMETHOD(void, new_color_map, (j_decompress_ptr cinfo)); |
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| 261 | }; |
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| 262 | |||
| 263 | |||
| 264 | /* Miscellaneous useful macros */ |
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| 265 | |||
| 266 | #undef MAX |
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| 267 | #define MAX(a,b) ((a) > (b) ? (a) : (b)) |
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| 268 | #undef MIN |
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| 269 | #define MIN(a,b) ((a) < (b) ? (a) : (b)) |
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| 270 | |||
| 271 | |||
| 272 | /* We assume that right shift corresponds to signed division by 2 with |
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| 273 | * rounding towards minus infinity. This is correct for typical "arithmetic |
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| 274 | * shift" instructions that shift in copies of the sign bit. But some |
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| 275 | * C compilers implement >> with an unsigned shift. For these machines you |
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| 276 | * must define RIGHT_SHIFT_IS_UNSIGNED. |
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| 277 | * RIGHT_SHIFT provides a proper signed right shift of an INT32 quantity. |
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| 278 | * It is only applied with constant shift counts. SHIFT_TEMPS must be |
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| 279 | * included in the variables of any routine using RIGHT_SHIFT. |
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| 280 | */ |
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| 281 | |||
| 282 | #ifdef RIGHT_SHIFT_IS_UNSIGNED |
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| 283 | #define SHIFT_TEMPS INT32 shift_temp; |
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| 284 | #define RIGHT_SHIFT(x,shft) \ |
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| 285 | ((shift_temp = (x)) < 0 ? \ |
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| 286 | (shift_temp >> (shft)) | ((~((INT32) 0)) << (32-(shft))) : \ |
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| 287 | (shift_temp >> (shft))) |
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| 288 | #else |
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| 289 | #define SHIFT_TEMPS |
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| 290 | #define RIGHT_SHIFT(x,shft) ((x) >> (shft)) |
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| 291 | #endif |
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| 292 | |||
| 293 | |||
| 294 | /* Short forms of external names for systems with brain-damaged linkers. */ |
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| 295 | |||
| 296 | #ifdef NEED_SHORT_EXTERNAL_NAMES |
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| 297 | #define jinit_compress_master jICompress |
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| 298 | #define jinit_c_master_control jICMaster |
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| 299 | #define jinit_c_main_controller jICMainC |
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| 300 | #define jinit_c_prep_controller jICPrepC |
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| 301 | #define jinit_c_coef_controller jICCoefC |
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| 302 | #define jinit_color_converter jICColor |
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| 303 | #define jinit_downsampler jIDownsampler |
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| 304 | #define jinit_forward_dct jIFDCT |
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| 305 | #define jinit_huff_encoder jIHEncoder |
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| 306 | #define jinit_phuff_encoder jIPHEncoder |
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| 307 | #define jinit_marker_writer jIMWriter |
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| 308 | #define jinit_master_decompress jIDMaster |
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| 309 | #define jinit_d_main_controller jIDMainC |
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| 310 | #define jinit_d_coef_controller jIDCoefC |
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| 311 | #define jinit_d_post_controller jIDPostC |
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| 312 | #define jinit_input_controller jIInCtlr |
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| 313 | #define jinit_marker_reader jIMReader |
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| 314 | #define jinit_huff_decoder jIHDecoder |
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| 315 | #define jinit_phuff_decoder jIPHDecoder |
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| 316 | #define jinit_inverse_dct jIIDCT |
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| 317 | #define jinit_upsampler jIUpsampler |
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| 318 | #define jinit_color_deconverter jIDColor |
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| 319 | #define jinit_1pass_quantizer jI1Quant |
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| 320 | #define jinit_2pass_quantizer jI2Quant |
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| 321 | #define jinit_merged_upsampler jIMUpsampler |
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| 322 | #define jinit_memory_mgr jIMemMgr |
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| 323 | #define jdiv_round_up jDivRound |
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| 324 | #define jround_up jRound |
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| 325 | #define jcopy_sample_rows jCopySamples |
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| 326 | #define jcopy_block_row jCopyBlocks |
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| 327 | #define jzero_far jZeroFar |
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| 328 | #define jpeg_zigzag_order jZIGTable |
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| 329 | #define jpeg_natural_order jZAGTable |
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| 330 | #endif /* NEED_SHORT_EXTERNAL_NAMES */ |
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| 331 | |||
| 332 | |||
| 333 | /* Compression module initialization routines */ |
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| 334 | EXTERN(void) jinit_compress_master JPP((j_compress_ptr cinfo)); |
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| 335 | EXTERN(void) jinit_c_master_control JPP((j_compress_ptr cinfo, |
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| 336 | boolean transcode_only)); |
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| 337 | EXTERN(void) jinit_c_main_controller JPP((j_compress_ptr cinfo, |
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| 338 | boolean need_full_buffer)); |
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| 339 | EXTERN(void) jinit_c_prep_controller JPP((j_compress_ptr cinfo, |
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| 340 | boolean need_full_buffer)); |
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| 341 | EXTERN(void) jinit_c_coef_controller JPP((j_compress_ptr cinfo, |
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| 342 | boolean need_full_buffer)); |
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| 343 | EXTERN(void) jinit_color_converter JPP((j_compress_ptr cinfo)); |
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| 344 | EXTERN(void) jinit_downsampler JPP((j_compress_ptr cinfo)); |
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| 345 | EXTERN(void) jinit_forward_dct JPP((j_compress_ptr cinfo)); |
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| 346 | EXTERN(void) jinit_huff_encoder JPP((j_compress_ptr cinfo)); |
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| 347 | EXTERN(void) jinit_phuff_encoder JPP((j_compress_ptr cinfo)); |
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| 348 | EXTERN(void) jinit_marker_writer JPP((j_compress_ptr cinfo)); |
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| 349 | /* Decompression module initialization routines */ |
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| 350 | EXTERN(void) jinit_master_decompress JPP((j_decompress_ptr cinfo)); |
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| 351 | EXTERN(void) jinit_d_main_controller JPP((j_decompress_ptr cinfo, |
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| 352 | boolean need_full_buffer)); |
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| 353 | EXTERN(void) jinit_d_coef_controller JPP((j_decompress_ptr cinfo, |
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| 354 | boolean need_full_buffer)); |
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| 355 | EXTERN(void) jinit_d_post_controller JPP((j_decompress_ptr cinfo, |
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| 356 | boolean need_full_buffer)); |
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| 357 | EXTERN(void) jinit_input_controller JPP((j_decompress_ptr cinfo)); |
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| 358 | EXTERN(void) jinit_marker_reader JPP((j_decompress_ptr cinfo)); |
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| 359 | EXTERN(void) jinit_huff_decoder JPP((j_decompress_ptr cinfo)); |
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| 360 | EXTERN(void) jinit_phuff_decoder JPP((j_decompress_ptr cinfo)); |
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| 361 | EXTERN(void) jinit_inverse_dct JPP((j_decompress_ptr cinfo)); |
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| 362 | EXTERN(void) jinit_upsampler JPP((j_decompress_ptr cinfo)); |
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| 363 | EXTERN(void) jinit_color_deconverter JPP((j_decompress_ptr cinfo)); |
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| 364 | EXTERN(void) jinit_1pass_quantizer JPP((j_decompress_ptr cinfo)); |
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| 365 | EXTERN(void) jinit_2pass_quantizer JPP((j_decompress_ptr cinfo)); |
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| 366 | EXTERN(void) jinit_merged_upsampler JPP((j_decompress_ptr cinfo)); |
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| 367 | /* Memory manager initialization */ |
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| 368 | EXTERN(void) jinit_memory_mgr JPP((j_common_ptr cinfo)); |
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| 369 | |||
| 370 | /* Utility routines in jutils.c */ |
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| 371 | EXTERN(long) jdiv_round_up JPP((long a, long b)); |
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| 372 | EXTERN(long) jround_up JPP((long a, long b)); |
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| 373 | EXTERN(void) jcopy_sample_rows JPP((JSAMPARRAY input_array, int source_row, |
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| 374 | JSAMPARRAY output_array, int dest_row, |
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| 375 | int num_rows, JDIMENSION num_cols)); |
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| 376 | EXTERN(void) jcopy_block_row JPP((JBLOCKROW input_row, JBLOCKROW output_row, |
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| 377 | JDIMENSION num_blocks)); |
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| 378 | EXTERN(void) jzero_far JPP((void FAR * target, size_t bytestozero)); |
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| 379 | /* Constant tables in jutils.c */ |
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| 380 | #if 0 /* This table is not actually needed in v6a */ |
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| 381 | extern const int jpeg_zigzag_order[]; /* natural coef order to zigzag order */ |
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| 382 | #endif |
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| 383 | extern const int jpeg_natural_order[]; /* zigzag coef order to natural order */ |
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| 384 | |||
| 385 | /* Suppress undefined-structure complaints if necessary. */ |
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| 386 | |||
| 387 | #ifdef INCOMPLETE_TYPES_BROKEN |
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| 388 | #ifndef AM_MEMORY_MANAGER /* only jmemmgr.c defines these */ |
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| 389 | struct jvirt_sarray_control { long dummy; }; |
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| 390 | struct jvirt_barray_control { long dummy; }; |
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| 391 | #endif |
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| 392 | #endif /* INCOMPLETE_TYPES_BROKEN */ |