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Rev | Author | Line No. | Line |
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6417 | ashmew2 | 1 | /* |
2 | * cjpeg.c |
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3 | * |
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4 | * Copyright (C) 1991-1998, 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 contains a command-line user interface for the JPEG compressor. |
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9 | * It should work on any system with Unix- or MS-DOS-style command lines. |
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10 | * |
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11 | * Two different command line styles are permitted, depending on the |
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12 | * compile-time switch TWO_FILE_COMMANDLINE: |
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13 | * cjpeg [options] inputfile outputfile |
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14 | * cjpeg [options] [inputfile] |
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15 | * In the second style, output is always to standard output, which you'd |
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16 | * normally redirect to a file or pipe to some other program. Input is |
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17 | * either from a named file or from standard input (typically redirected). |
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18 | * The second style is convenient on Unix but is unhelpful on systems that |
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19 | * don't support pipes. Also, you MUST use the first style if your system |
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20 | * doesn't do binary I/O to stdin/stdout. |
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21 | * To simplify script writing, the "-outfile" switch is provided. The syntax |
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22 | * cjpeg [options] -outfile outputfile inputfile |
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23 | * works regardless of which command line style is used. |
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24 | */ |
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25 | |||
26 | #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ |
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27 | #include "jversion.h" /* for version message */ |
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28 | |||
29 | #ifdef USE_CCOMMAND /* command-line reader for Macintosh */ |
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30 | #ifdef __MWERKS__ |
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31 | #include |
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32 | #include |
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33 | #endif |
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34 | #ifdef THINK_C |
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35 | #include |
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36 | #endif |
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37 | #endif |
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38 | |||
39 | |||
40 | /* Create the add-on message string table. */ |
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41 | |||
42 | #define JMESSAGE(code,string) string , |
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43 | |||
44 | static const char * const cdjpeg_message_table[] = { |
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45 | #include "cderror.h" |
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46 | NULL |
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47 | }; |
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48 | |||
49 | |||
50 | /* |
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51 | * This routine determines what format the input file is, |
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52 | * and selects the appropriate input-reading module. |
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53 | * |
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54 | * To determine which family of input formats the file belongs to, |
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55 | * we may look only at the first byte of the file, since C does not |
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56 | * guarantee that more than one character can be pushed back with ungetc. |
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57 | * Looking at additional bytes would require one of these approaches: |
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58 | * 1) assume we can fseek() the input file (fails for piped input); |
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59 | * 2) assume we can push back more than one character (works in |
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60 | * some C implementations, but unportable); |
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61 | * 3) provide our own buffering (breaks input readers that want to use |
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62 | * stdio directly, such as the RLE library); |
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63 | * or 4) don't put back the data, and modify the input_init methods to assume |
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64 | * they start reading after the start of file (also breaks RLE library). |
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65 | * #1 is attractive for MS-DOS but is untenable on Unix. |
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66 | * |
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67 | * The most portable solution for file types that can't be identified by their |
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68 | * first byte is to make the user tell us what they are. This is also the |
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69 | * only approach for "raw" file types that contain only arbitrary values. |
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70 | * We presently apply this method for Targa files. Most of the time Targa |
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71 | * files start with 0x00, so we recognize that case. Potentially, however, |
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72 | * a Targa file could start with any byte value (byte 0 is the length of the |
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73 | * seldom-used ID field), so we provide a switch to force Targa input mode. |
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74 | */ |
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75 | |||
76 | static boolean is_targa; /* records user -targa switch */ |
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77 | |||
78 | |||
79 | LOCAL(cjpeg_source_ptr) |
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80 | select_file_type (j_compress_ptr cinfo, FILE * infile) |
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81 | { |
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82 | int c; |
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83 | |||
84 | if (is_targa) { |
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85 | #ifdef TARGA_SUPPORTED |
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86 | return jinit_read_targa(cinfo); |
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87 | #else |
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88 | ERREXIT(cinfo, JERR_TGA_NOTCOMP); |
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89 | #endif |
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90 | } |
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91 | |||
92 | if ((c = getc(infile)) == EOF) |
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93 | ERREXIT(cinfo, JERR_INPUT_EMPTY); |
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94 | if (ungetc(c, infile) == EOF) |
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95 | ERREXIT(cinfo, JERR_UNGETC_FAILED); |
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96 | |||
97 | switch (c) { |
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98 | #ifdef BMP_SUPPORTED |
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99 | case 'B': |
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100 | return jinit_read_bmp(cinfo); |
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101 | #endif |
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102 | #ifdef GIF_SUPPORTED |
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103 | case 'G': |
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104 | return jinit_read_gif(cinfo); |
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105 | #endif |
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106 | #ifdef PPM_SUPPORTED |
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107 | case 'P': |
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108 | return jinit_read_ppm(cinfo); |
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109 | #endif |
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110 | #ifdef RLE_SUPPORTED |
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111 | case 'R': |
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112 | return jinit_read_rle(cinfo); |
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113 | #endif |
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114 | #ifdef TARGA_SUPPORTED |
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115 | case 0x00: |
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116 | return jinit_read_targa(cinfo); |
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117 | #endif |
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118 | default: |
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119 | ERREXIT(cinfo, JERR_UNKNOWN_FORMAT); |
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120 | break; |
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121 | } |
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122 | |||
123 | return NULL; /* suppress compiler warnings */ |
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124 | } |
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125 | |||
126 | |||
127 | /* |
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128 | * Argument-parsing code. |
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129 | * The switch parser is designed to be useful with DOS-style command line |
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130 | * syntax, ie, intermixed switches and file names, where only the switches |
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131 | * to the left of a given file name affect processing of that file. |
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132 | * The main program in this file doesn't actually use this capability... |
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133 | */ |
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134 | |||
135 | |||
136 | static const char * progname; /* program name for error messages */ |
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137 | static char * outfilename; /* for -outfile switch */ |
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138 | |||
139 | |||
140 | LOCAL(void) |
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141 | usage (void) |
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142 | /* complain about bad command line */ |
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143 | { |
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144 | fprintf(stderr, "usage: %s [switches] ", progname); |
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145 | #ifdef TWO_FILE_COMMANDLINE |
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146 | fprintf(stderr, "inputfile outputfile\n"); |
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147 | #else |
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148 | fprintf(stderr, "[inputfile]\n"); |
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149 | #endif |
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150 | |||
151 | fprintf(stderr, "Switches (names may be abbreviated):\n"); |
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152 | fprintf(stderr, " -quality N Compression quality (0..100; 5-95 is useful range)\n"); |
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153 | fprintf(stderr, " -grayscale Create monochrome JPEG file\n"); |
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154 | #ifdef ENTROPY_OPT_SUPPORTED |
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155 | fprintf(stderr, " -optimize Optimize Huffman table (smaller file, but slow compression)\n"); |
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156 | #endif |
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157 | #ifdef C_PROGRESSIVE_SUPPORTED |
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158 | fprintf(stderr, " -progressive Create progressive JPEG file\n"); |
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159 | #endif |
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160 | #ifdef TARGA_SUPPORTED |
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161 | fprintf(stderr, " -targa Input file is Targa format (usually not needed)\n"); |
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162 | #endif |
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163 | fprintf(stderr, "Switches for advanced users:\n"); |
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164 | #ifdef DCT_ISLOW_SUPPORTED |
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165 | fprintf(stderr, " -dct int Use integer DCT method%s\n", |
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166 | (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : "")); |
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167 | #endif |
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168 | #ifdef DCT_IFAST_SUPPORTED |
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169 | fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n", |
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170 | (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : "")); |
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171 | #endif |
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172 | #ifdef DCT_FLOAT_SUPPORTED |
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173 | fprintf(stderr, " -dct float Use floating-point DCT method%s\n", |
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174 | (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : "")); |
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175 | #endif |
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176 | fprintf(stderr, " -restart N Set restart interval in rows, or in blocks with B\n"); |
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177 | #ifdef INPUT_SMOOTHING_SUPPORTED |
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178 | fprintf(stderr, " -smooth N Smooth dithered input (N=1..100 is strength)\n"); |
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179 | #endif |
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180 | fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n"); |
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181 | fprintf(stderr, " -outfile name Specify name for output file\n"); |
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182 | fprintf(stderr, " -verbose or -debug Emit debug output\n"); |
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183 | fprintf(stderr, "Switches for wizards:\n"); |
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184 | #ifdef C_ARITH_CODING_SUPPORTED |
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185 | fprintf(stderr, " -arithmetic Use arithmetic coding\n"); |
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186 | #endif |
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187 | fprintf(stderr, " -baseline Force baseline quantization tables\n"); |
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188 | fprintf(stderr, " -qtables file Use quantization tables given in file\n"); |
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189 | fprintf(stderr, " -qslots N[,...] Set component quantization tables\n"); |
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190 | fprintf(stderr, " -sample HxV[,...] Set component sampling factors\n"); |
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191 | #ifdef C_MULTISCAN_FILES_SUPPORTED |
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192 | fprintf(stderr, " -scans file Create multi-scan JPEG per script file\n"); |
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193 | #endif |
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194 | exit(EXIT_FAILURE); |
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195 | } |
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196 | |||
197 | |||
198 | LOCAL(int) |
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199 | parse_switches (j_compress_ptr cinfo, int argc, char **argv, |
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200 | int last_file_arg_seen, boolean for_real) |
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201 | /* Parse optional switches. |
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202 | * Returns argv[] index of first file-name argument (== argc if none). |
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203 | * Any file names with indexes <= last_file_arg_seen are ignored; |
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204 | * they have presumably been processed in a previous iteration. |
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205 | * (Pass 0 for last_file_arg_seen on the first or only iteration.) |
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206 | * for_real is FALSE on the first (dummy) pass; we may skip any expensive |
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207 | * processing. |
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208 | */ |
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209 | { |
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210 | int argn; |
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211 | char * arg; |
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212 | int quality; /* -quality parameter */ |
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213 | int q_scale_factor; /* scaling percentage for -qtables */ |
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214 | boolean force_baseline; |
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215 | boolean simple_progressive; |
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216 | char * qtablefile = NULL; /* saves -qtables filename if any */ |
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217 | char * qslotsarg = NULL; /* saves -qslots parm if any */ |
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218 | char * samplearg = NULL; /* saves -sample parm if any */ |
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219 | char * scansarg = NULL; /* saves -scans parm if any */ |
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220 | |||
221 | /* Set up default JPEG parameters. */ |
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222 | /* Note that default -quality level need not, and does not, |
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223 | * match the default scaling for an explicit -qtables argument. |
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224 | */ |
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225 | quality = 75; /* default -quality value */ |
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226 | q_scale_factor = 100; /* default to no scaling for -qtables */ |
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227 | force_baseline = FALSE; /* by default, allow 16-bit quantizers */ |
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228 | simple_progressive = FALSE; |
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229 | is_targa = FALSE; |
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230 | outfilename = NULL; |
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231 | cinfo->err->trace_level = 0; |
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232 | |||
233 | /* Scan command line options, adjust parameters */ |
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234 | |||
235 | for (argn = 1; argn < argc; argn++) { |
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236 | arg = argv[argn]; |
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237 | if (*arg != '-') { |
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238 | /* Not a switch, must be a file name argument */ |
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239 | if (argn <= last_file_arg_seen) { |
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240 | outfilename = NULL; /* -outfile applies to just one input file */ |
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241 | continue; /* ignore this name if previously processed */ |
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242 | } |
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243 | break; /* else done parsing switches */ |
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244 | } |
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245 | arg++; /* advance past switch marker character */ |
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246 | |||
247 | if (keymatch(arg, "arithmetic", 1)) { |
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248 | /* Use arithmetic coding. */ |
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249 | #ifdef C_ARITH_CODING_SUPPORTED |
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250 | cinfo->arith_code = TRUE; |
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251 | #else |
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252 | fprintf(stderr, "%s: sorry, arithmetic coding not supported\n", |
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253 | progname); |
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254 | exit(EXIT_FAILURE); |
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255 | #endif |
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256 | |||
257 | } else if (keymatch(arg, "baseline", 1)) { |
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258 | /* Force baseline-compatible output (8-bit quantizer values). */ |
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259 | force_baseline = TRUE; |
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260 | |||
261 | } else if (keymatch(arg, "dct", 2)) { |
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262 | /* Select DCT algorithm. */ |
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263 | if (++argn >= argc) /* advance to next argument */ |
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264 | usage(); |
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265 | if (keymatch(argv[argn], "int", 1)) { |
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266 | cinfo->dct_method = JDCT_ISLOW; |
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267 | } else if (keymatch(argv[argn], "fast", 2)) { |
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268 | cinfo->dct_method = JDCT_IFAST; |
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269 | } else if (keymatch(argv[argn], "float", 2)) { |
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270 | cinfo->dct_method = JDCT_FLOAT; |
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271 | } else |
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272 | usage(); |
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273 | |||
274 | } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) { |
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275 | /* Enable debug printouts. */ |
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276 | /* On first -d, print version identification */ |
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277 | static boolean printed_version = FALSE; |
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278 | |||
279 | if (! printed_version) { |
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280 | fprintf(stderr, "Independent JPEG Group's CJPEG, version %s\n%s\n", |
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281 | JVERSION, JCOPYRIGHT); |
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282 | printed_version = TRUE; |
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283 | } |
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284 | cinfo->err->trace_level++; |
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285 | |||
286 | } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) { |
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287 | /* Force a monochrome JPEG file to be generated. */ |
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288 | jpeg_set_colorspace(cinfo, JCS_GRAYSCALE); |
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289 | |||
290 | } else if (keymatch(arg, "maxmemory", 3)) { |
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291 | /* Maximum memory in Kb (or Mb with 'm'). */ |
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292 | long lval; |
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293 | char ch = 'x'; |
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294 | |||
295 | if (++argn >= argc) /* advance to next argument */ |
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296 | usage(); |
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297 | if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1) |
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298 | usage(); |
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299 | if (ch == 'm' || ch == 'M') |
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300 | lval *= 1000L; |
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301 | cinfo->mem->max_memory_to_use = lval * 1000L; |
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302 | |||
303 | } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) { |
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304 | /* Enable entropy parm optimization. */ |
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305 | #ifdef ENTROPY_OPT_SUPPORTED |
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306 | cinfo->optimize_coding = TRUE; |
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307 | #else |
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308 | fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n", |
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309 | progname); |
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310 | exit(EXIT_FAILURE); |
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311 | #endif |
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312 | |||
313 | } else if (keymatch(arg, "outfile", 4)) { |
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314 | /* Set output file name. */ |
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315 | if (++argn >= argc) /* advance to next argument */ |
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316 | usage(); |
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317 | outfilename = argv[argn]; /* save it away for later use */ |
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318 | |||
319 | } else if (keymatch(arg, "progressive", 1)) { |
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320 | /* Select simple progressive mode. */ |
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321 | #ifdef C_PROGRESSIVE_SUPPORTED |
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322 | simple_progressive = TRUE; |
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323 | /* We must postpone execution until num_components is known. */ |
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324 | #else |
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325 | fprintf(stderr, "%s: sorry, progressive output was not compiled\n", |
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326 | progname); |
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327 | exit(EXIT_FAILURE); |
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328 | #endif |
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329 | |||
330 | } else if (keymatch(arg, "quality", 1)) { |
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331 | /* Quality factor (quantization table scaling factor). */ |
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332 | if (++argn >= argc) /* advance to next argument */ |
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333 | usage(); |
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334 | if (sscanf(argv[argn], "%d", &quality) != 1) |
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335 | usage(); |
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336 | /* Change scale factor in case -qtables is present. */ |
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337 | q_scale_factor = jpeg_quality_scaling(quality); |
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338 | |||
339 | } else if (keymatch(arg, "qslots", 2)) { |
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340 | /* Quantization table slot numbers. */ |
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341 | if (++argn >= argc) /* advance to next argument */ |
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342 | usage(); |
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343 | qslotsarg = argv[argn]; |
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344 | /* Must delay setting qslots until after we have processed any |
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345 | * colorspace-determining switches, since jpeg_set_colorspace sets |
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346 | * default quant table numbers. |
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347 | */ |
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348 | |||
349 | } else if (keymatch(arg, "qtables", 2)) { |
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350 | /* Quantization tables fetched from file. */ |
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351 | if (++argn >= argc) /* advance to next argument */ |
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352 | usage(); |
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353 | qtablefile = argv[argn]; |
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354 | /* We postpone actually reading the file in case -quality comes later. */ |
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355 | |||
356 | } else if (keymatch(arg, "restart", 1)) { |
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357 | /* Restart interval in MCU rows (or in MCUs with 'b'). */ |
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358 | long lval; |
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359 | char ch = 'x'; |
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360 | |||
361 | if (++argn >= argc) /* advance to next argument */ |
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362 | usage(); |
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363 | if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1) |
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364 | usage(); |
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365 | if (lval < 0 || lval > 65535L) |
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366 | usage(); |
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367 | if (ch == 'b' || ch == 'B') { |
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368 | cinfo->restart_interval = (unsigned int) lval; |
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369 | cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */ |
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370 | } else { |
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371 | cinfo->restart_in_rows = (int) lval; |
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372 | /* restart_interval will be computed during startup */ |
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373 | } |
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374 | |||
375 | } else if (keymatch(arg, "sample", 2)) { |
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376 | /* Set sampling factors. */ |
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377 | if (++argn >= argc) /* advance to next argument */ |
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378 | usage(); |
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379 | samplearg = argv[argn]; |
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380 | /* Must delay setting sample factors until after we have processed any |
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381 | * colorspace-determining switches, since jpeg_set_colorspace sets |
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382 | * default sampling factors. |
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383 | */ |
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384 | |||
385 | } else if (keymatch(arg, "scans", 2)) { |
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386 | /* Set scan script. */ |
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387 | #ifdef C_MULTISCAN_FILES_SUPPORTED |
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388 | if (++argn >= argc) /* advance to next argument */ |
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389 | usage(); |
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390 | scansarg = argv[argn]; |
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391 | /* We must postpone reading the file in case -progressive appears. */ |
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392 | #else |
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393 | fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n", |
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394 | progname); |
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395 | exit(EXIT_FAILURE); |
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396 | #endif |
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397 | |||
398 | } else if (keymatch(arg, "smooth", 2)) { |
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399 | /* Set input smoothing factor. */ |
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400 | int val; |
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401 | |||
402 | if (++argn >= argc) /* advance to next argument */ |
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403 | usage(); |
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404 | if (sscanf(argv[argn], "%d", &val) != 1) |
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405 | usage(); |
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406 | if (val < 0 || val > 100) |
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407 | usage(); |
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408 | cinfo->smoothing_factor = val; |
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409 | |||
410 | } else if (keymatch(arg, "targa", 1)) { |
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411 | /* Input file is Targa format. */ |
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412 | is_targa = TRUE; |
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413 | |||
414 | } else { |
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415 | usage(); /* bogus switch */ |
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416 | } |
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417 | } |
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418 | |||
419 | /* Post-switch-scanning cleanup */ |
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420 | |||
421 | if (for_real) { |
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422 | |||
423 | /* Set quantization tables for selected quality. */ |
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424 | /* Some or all may be overridden if -qtables is present. */ |
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425 | jpeg_set_quality(cinfo, quality, force_baseline); |
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426 | |||
427 | if (qtablefile != NULL) /* process -qtables if it was present */ |
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428 | if (! read_quant_tables(cinfo, qtablefile, |
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429 | q_scale_factor, force_baseline)) |
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430 | usage(); |
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431 | |||
432 | if (qslotsarg != NULL) /* process -qslots if it was present */ |
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433 | if (! set_quant_slots(cinfo, qslotsarg)) |
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434 | usage(); |
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435 | |||
436 | if (samplearg != NULL) /* process -sample if it was present */ |
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437 | if (! set_sample_factors(cinfo, samplearg)) |
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438 | usage(); |
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439 | |||
440 | #ifdef C_PROGRESSIVE_SUPPORTED |
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441 | if (simple_progressive) /* process -progressive; -scans can override */ |
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442 | jpeg_simple_progression(cinfo); |
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443 | #endif |
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444 | |||
445 | #ifdef C_MULTISCAN_FILES_SUPPORTED |
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446 | if (scansarg != NULL) /* process -scans if it was present */ |
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447 | if (! read_scan_script(cinfo, scansarg)) |
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448 | usage(); |
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449 | #endif |
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450 | } |
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451 | |||
452 | return argn; /* return index of next arg (file name) */ |
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453 | } |
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454 | |||
455 | |||
456 | /* |
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457 | * The main program. |
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458 | */ |
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459 | |||
460 | int |
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461 | main (int argc, char **argv) |
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462 | { |
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463 | struct jpeg_compress_struct cinfo; |
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464 | struct jpeg_error_mgr jerr; |
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465 | #ifdef PROGRESS_REPORT |
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466 | struct cdjpeg_progress_mgr progress; |
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467 | #endif |
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468 | int file_index; |
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469 | cjpeg_source_ptr src_mgr; |
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470 | FILE * input_file; |
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471 | FILE * output_file; |
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472 | JDIMENSION num_scanlines; |
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473 | |||
474 | /* On Mac, fetch a command line. */ |
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475 | #ifdef USE_CCOMMAND |
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476 | argc = ccommand(&argv); |
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477 | #endif |
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478 | |||
479 | progname = argv[0]; |
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480 | if (progname == NULL || progname[0] == 0) |
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481 | progname = "cjpeg"; /* in case C library doesn't provide it */ |
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482 | |||
483 | /* Initialize the JPEG compression object with default error handling. */ |
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484 | cinfo.err = jpeg_std_error(&jerr); |
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485 | jpeg_create_compress(&cinfo); |
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486 | /* Add some application-specific error messages (from cderror.h) */ |
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487 | jerr.addon_message_table = cdjpeg_message_table; |
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488 | jerr.first_addon_message = JMSG_FIRSTADDONCODE; |
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489 | jerr.last_addon_message = JMSG_LASTADDONCODE; |
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490 | |||
491 | /* Now safe to enable signal catcher. */ |
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492 | #ifdef NEED_SIGNAL_CATCHER |
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493 | enable_signal_catcher((j_common_ptr) &cinfo); |
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494 | #endif |
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495 | |||
496 | /* Initialize JPEG parameters. |
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497 | * Much of this may be overridden later. |
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498 | * In particular, we don't yet know the input file's color space, |
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499 | * but we need to provide some value for jpeg_set_defaults() to work. |
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500 | */ |
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501 | |||
502 | cinfo.in_color_space = JCS_RGB; /* arbitrary guess */ |
||
503 | jpeg_set_defaults(&cinfo); |
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504 | |||
505 | /* Scan command line to find file names. |
||
506 | * It is convenient to use just one switch-parsing routine, but the switch |
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507 | * values read here are ignored; we will rescan the switches after opening |
||
508 | * the input file. |
||
509 | */ |
||
510 | |||
511 | file_index = parse_switches(&cinfo, argc, argv, 0, FALSE); |
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512 | |||
513 | #ifdef TWO_FILE_COMMANDLINE |
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514 | /* Must have either -outfile switch or explicit output file name */ |
||
515 | if (outfilename == NULL) { |
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516 | if (file_index != argc-2) { |
||
517 | fprintf(stderr, "%s: must name one input and one output file\n", |
||
518 | progname); |
||
519 | usage(); |
||
520 | } |
||
521 | outfilename = argv[file_index+1]; |
||
522 | } else { |
||
523 | if (file_index != argc-1) { |
||
524 | fprintf(stderr, "%s: must name one input and one output file\n", |
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525 | progname); |
||
526 | usage(); |
||
527 | } |
||
528 | } |
||
529 | #else |
||
530 | /* Unix style: expect zero or one file name */ |
||
531 | if (file_index < argc-1) { |
||
532 | fprintf(stderr, "%s: only one input file\n", progname); |
||
533 | usage(); |
||
534 | } |
||
535 | #endif /* TWO_FILE_COMMANDLINE */ |
||
536 | |||
537 | /* Open the input file. */ |
||
538 | if (file_index < argc) { |
||
539 | if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) { |
||
540 | fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]); |
||
541 | exit(EXIT_FAILURE); |
||
542 | } |
||
543 | } else { |
||
544 | /* default input file is stdin */ |
||
545 | input_file = read_stdin(); |
||
546 | } |
||
547 | |||
548 | /* Open the output file. */ |
||
549 | if (outfilename != NULL) { |
||
550 | if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) { |
||
551 | fprintf(stderr, "%s: can't open %s\n", progname, outfilename); |
||
552 | exit(EXIT_FAILURE); |
||
553 | } |
||
554 | } else { |
||
555 | /* default output file is stdout */ |
||
556 | output_file = write_stdout(); |
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557 | } |
||
558 | |||
559 | #ifdef PROGRESS_REPORT |
||
560 | start_progress_monitor((j_common_ptr) &cinfo, &progress); |
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561 | #endif |
||
562 | |||
563 | /* Figure out the input file format, and set up to read it. */ |
||
564 | src_mgr = select_file_type(&cinfo, input_file); |
||
565 | src_mgr->input_file = input_file; |
||
566 | |||
567 | /* Read the input file header to obtain file size & colorspace. */ |
||
568 | (*src_mgr->start_input) (&cinfo, src_mgr); |
||
569 | |||
570 | /* Now that we know input colorspace, fix colorspace-dependent defaults */ |
||
571 | jpeg_default_colorspace(&cinfo); |
||
572 | |||
573 | /* Adjust default compression parameters by re-parsing the options */ |
||
574 | file_index = parse_switches(&cinfo, argc, argv, 0, TRUE); |
||
575 | |||
576 | /* Specify data destination for compression */ |
||
577 | jpeg_stdio_dest(&cinfo, output_file); |
||
578 | |||
579 | /* Start compressor */ |
||
580 | jpeg_start_compress(&cinfo, TRUE); |
||
581 | |||
582 | /* Process data */ |
||
583 | while (cinfo.next_scanline < cinfo.image_height) { |
||
584 | num_scanlines = (*src_mgr->get_pixel_rows) (&cinfo, src_mgr); |
||
585 | (void) jpeg_write_scanlines(&cinfo, src_mgr->buffer, num_scanlines); |
||
586 | } |
||
587 | |||
588 | /* Finish compression and release memory */ |
||
589 | (*src_mgr->finish_input) (&cinfo, src_mgr); |
||
590 | jpeg_finish_compress(&cinfo); |
||
591 | jpeg_destroy_compress(&cinfo); |
||
592 | |||
593 | /* Close files, if we opened them */ |
||
594 | if (input_file != stdin) |
||
595 | fclose(input_file); |
||
596 | if (output_file != stdout) |
||
597 | fclose(output_file); |
||
598 | |||
599 | #ifdef PROGRESS_REPORT |
||
600 | end_progress_monitor((j_common_ptr) &cinfo); |
||
601 | #endif |
||
602 | |||
603 | /* All done. */ |
||
604 | exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS); |
||
605 | return 0; /* suppress no-return-value warnings */ |
||
606 | }>>>>>>>=>>=> |