Final 350 project
Dependencies: uzair Camera_LS_Y201 F7_Ethernet LCD_DISCO_F746NG NetworkAPI SDFileSystem mbed
includes/rdppm.c@0:791a779d6220, 2017-07-31 (annotated)
- Committer:
- shoaib_ahmed
- Date:
- Mon Jul 31 09:16:35 2017 +0000
- Revision:
- 0:791a779d6220
final project;
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
shoaib_ahmed | 0:791a779d6220 | 1 | /* |
shoaib_ahmed | 0:791a779d6220 | 2 | * rdppm.c |
shoaib_ahmed | 0:791a779d6220 | 3 | * |
shoaib_ahmed | 0:791a779d6220 | 4 | * Copyright (C) 1991-1997, Thomas G. Lane. |
shoaib_ahmed | 0:791a779d6220 | 5 | * Modified 2009 by Bill Allombert, Guido Vollbeding. |
shoaib_ahmed | 0:791a779d6220 | 6 | * This file is part of the Independent JPEG Group's software. |
shoaib_ahmed | 0:791a779d6220 | 7 | * For conditions of distribution and use, see the accompanying README file. |
shoaib_ahmed | 0:791a779d6220 | 8 | * |
shoaib_ahmed | 0:791a779d6220 | 9 | * This file contains routines to read input images in PPM/PGM format. |
shoaib_ahmed | 0:791a779d6220 | 10 | * The extended 2-byte-per-sample raw PPM/PGM formats are supported. |
shoaib_ahmed | 0:791a779d6220 | 11 | * The PBMPLUS library is NOT required to compile this software |
shoaib_ahmed | 0:791a779d6220 | 12 | * (but it is highly useful as a set of PPM image manipulation programs). |
shoaib_ahmed | 0:791a779d6220 | 13 | * |
shoaib_ahmed | 0:791a779d6220 | 14 | * These routines may need modification for non-Unix environments or |
shoaib_ahmed | 0:791a779d6220 | 15 | * specialized applications. As they stand, they assume input from |
shoaib_ahmed | 0:791a779d6220 | 16 | * an ordinary stdio stream. They further assume that reading begins |
shoaib_ahmed | 0:791a779d6220 | 17 | * at the start of the file; start_input may need work if the |
shoaib_ahmed | 0:791a779d6220 | 18 | * user interface has already read some data (e.g., to determine that |
shoaib_ahmed | 0:791a779d6220 | 19 | * the file is indeed PPM format). |
shoaib_ahmed | 0:791a779d6220 | 20 | */ |
shoaib_ahmed | 0:791a779d6220 | 21 | |
shoaib_ahmed | 0:791a779d6220 | 22 | #include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */ |
shoaib_ahmed | 0:791a779d6220 | 23 | |
shoaib_ahmed | 0:791a779d6220 | 24 | #ifdef PPM_SUPPORTED |
shoaib_ahmed | 0:791a779d6220 | 25 | |
shoaib_ahmed | 0:791a779d6220 | 26 | |
shoaib_ahmed | 0:791a779d6220 | 27 | /* Portions of this code are based on the PBMPLUS library, which is: |
shoaib_ahmed | 0:791a779d6220 | 28 | ** |
shoaib_ahmed | 0:791a779d6220 | 29 | ** Copyright (C) 1988 by Jef Poskanzer. |
shoaib_ahmed | 0:791a779d6220 | 30 | ** |
shoaib_ahmed | 0:791a779d6220 | 31 | ** Permission to use, copy, modify, and distribute this software and its |
shoaib_ahmed | 0:791a779d6220 | 32 | ** documentation for any purpose and without fee is hereby granted, provided |
shoaib_ahmed | 0:791a779d6220 | 33 | ** that the above copyright notice appear in all copies and that both that |
shoaib_ahmed | 0:791a779d6220 | 34 | ** copyright notice and this permission notice appear in supporting |
shoaib_ahmed | 0:791a779d6220 | 35 | ** documentation. This software is provided "as is" without express or |
shoaib_ahmed | 0:791a779d6220 | 36 | ** implied warranty. |
shoaib_ahmed | 0:791a779d6220 | 37 | */ |
shoaib_ahmed | 0:791a779d6220 | 38 | |
shoaib_ahmed | 0:791a779d6220 | 39 | |
shoaib_ahmed | 0:791a779d6220 | 40 | /* Macros to deal with unsigned chars as efficiently as compiler allows */ |
shoaib_ahmed | 0:791a779d6220 | 41 | |
shoaib_ahmed | 0:791a779d6220 | 42 | #ifdef HAVE_UNSIGNED_CHAR |
shoaib_ahmed | 0:791a779d6220 | 43 | typedef unsigned char U_CHAR; |
shoaib_ahmed | 0:791a779d6220 | 44 | #define UCH(x) ((int) (x)) |
shoaib_ahmed | 0:791a779d6220 | 45 | #else /* !HAVE_UNSIGNED_CHAR */ |
shoaib_ahmed | 0:791a779d6220 | 46 | #ifdef CHAR_IS_UNSIGNED |
shoaib_ahmed | 0:791a779d6220 | 47 | typedef char U_CHAR; |
shoaib_ahmed | 0:791a779d6220 | 48 | #define UCH(x) ((int) (x)) |
shoaib_ahmed | 0:791a779d6220 | 49 | #else |
shoaib_ahmed | 0:791a779d6220 | 50 | typedef char U_CHAR; |
shoaib_ahmed | 0:791a779d6220 | 51 | #define UCH(x) ((int) (x) & 0xFF) |
shoaib_ahmed | 0:791a779d6220 | 52 | #endif |
shoaib_ahmed | 0:791a779d6220 | 53 | #endif /* HAVE_UNSIGNED_CHAR */ |
shoaib_ahmed | 0:791a779d6220 | 54 | |
shoaib_ahmed | 0:791a779d6220 | 55 | |
shoaib_ahmed | 0:791a779d6220 | 56 | #define ReadOK(file,buffer,len) (JFREAD(file,buffer,len) == ((size_t) (len))) |
shoaib_ahmed | 0:791a779d6220 | 57 | |
shoaib_ahmed | 0:791a779d6220 | 58 | |
shoaib_ahmed | 0:791a779d6220 | 59 | /* |
shoaib_ahmed | 0:791a779d6220 | 60 | * On most systems, reading individual bytes with getc() is drastically less |
shoaib_ahmed | 0:791a779d6220 | 61 | * efficient than buffering a row at a time with fread(). On PCs, we must |
shoaib_ahmed | 0:791a779d6220 | 62 | * allocate the buffer in near data space, because we are assuming small-data |
shoaib_ahmed | 0:791a779d6220 | 63 | * memory model, wherein fread() can't reach far memory. If you need to |
shoaib_ahmed | 0:791a779d6220 | 64 | * process very wide images on a PC, you might have to compile in large-memory |
shoaib_ahmed | 0:791a779d6220 | 65 | * model, or else replace fread() with a getc() loop --- which will be much |
shoaib_ahmed | 0:791a779d6220 | 66 | * slower. |
shoaib_ahmed | 0:791a779d6220 | 67 | */ |
shoaib_ahmed | 0:791a779d6220 | 68 | |
shoaib_ahmed | 0:791a779d6220 | 69 | |
shoaib_ahmed | 0:791a779d6220 | 70 | /* Private version of data source object */ |
shoaib_ahmed | 0:791a779d6220 | 71 | |
shoaib_ahmed | 0:791a779d6220 | 72 | typedef struct { |
shoaib_ahmed | 0:791a779d6220 | 73 | struct cjpeg_source_struct pub; /* public fields */ |
shoaib_ahmed | 0:791a779d6220 | 74 | |
shoaib_ahmed | 0:791a779d6220 | 75 | U_CHAR *iobuffer; /* non-FAR pointer to I/O buffer */ |
shoaib_ahmed | 0:791a779d6220 | 76 | JSAMPROW pixrow; /* FAR pointer to same */ |
shoaib_ahmed | 0:791a779d6220 | 77 | size_t buffer_width; /* width of I/O buffer */ |
shoaib_ahmed | 0:791a779d6220 | 78 | JSAMPLE *rescale; /* => maxval-remapping array, or NULL */ |
shoaib_ahmed | 0:791a779d6220 | 79 | } ppm_source_struct; |
shoaib_ahmed | 0:791a779d6220 | 80 | |
shoaib_ahmed | 0:791a779d6220 | 81 | typedef ppm_source_struct * ppm_source_ptr; |
shoaib_ahmed | 0:791a779d6220 | 82 | |
shoaib_ahmed | 0:791a779d6220 | 83 | |
shoaib_ahmed | 0:791a779d6220 | 84 | LOCAL(int) |
shoaib_ahmed | 0:791a779d6220 | 85 | pbm_getc (FILE * infile) |
shoaib_ahmed | 0:791a779d6220 | 86 | /* Read next char, skipping over any comments */ |
shoaib_ahmed | 0:791a779d6220 | 87 | /* A comment/newline sequence is returned as a newline */ |
shoaib_ahmed | 0:791a779d6220 | 88 | { |
shoaib_ahmed | 0:791a779d6220 | 89 | register int ch; |
shoaib_ahmed | 0:791a779d6220 | 90 | |
shoaib_ahmed | 0:791a779d6220 | 91 | ch = getc(infile); |
shoaib_ahmed | 0:791a779d6220 | 92 | if (ch == '#') { |
shoaib_ahmed | 0:791a779d6220 | 93 | do { |
shoaib_ahmed | 0:791a779d6220 | 94 | ch = getc(infile); |
shoaib_ahmed | 0:791a779d6220 | 95 | } while (ch != '\n' && ch != EOF); |
shoaib_ahmed | 0:791a779d6220 | 96 | } |
shoaib_ahmed | 0:791a779d6220 | 97 | return ch; |
shoaib_ahmed | 0:791a779d6220 | 98 | } |
shoaib_ahmed | 0:791a779d6220 | 99 | |
shoaib_ahmed | 0:791a779d6220 | 100 | |
shoaib_ahmed | 0:791a779d6220 | 101 | LOCAL(unsigned int) |
shoaib_ahmed | 0:791a779d6220 | 102 | read_pbm_integer (j_compress_ptr cinfo, FILE * infile) |
shoaib_ahmed | 0:791a779d6220 | 103 | /* Read an unsigned decimal integer from the PPM file */ |
shoaib_ahmed | 0:791a779d6220 | 104 | /* Swallows one trailing character after the integer */ |
shoaib_ahmed | 0:791a779d6220 | 105 | /* Note that on a 16-bit-int machine, only values up to 64k can be read. */ |
shoaib_ahmed | 0:791a779d6220 | 106 | /* This should not be a problem in practice. */ |
shoaib_ahmed | 0:791a779d6220 | 107 | { |
shoaib_ahmed | 0:791a779d6220 | 108 | register int ch; |
shoaib_ahmed | 0:791a779d6220 | 109 | register unsigned int val; |
shoaib_ahmed | 0:791a779d6220 | 110 | |
shoaib_ahmed | 0:791a779d6220 | 111 | /* Skip any leading whitespace */ |
shoaib_ahmed | 0:791a779d6220 | 112 | do { |
shoaib_ahmed | 0:791a779d6220 | 113 | ch = pbm_getc(infile); |
shoaib_ahmed | 0:791a779d6220 | 114 | if (ch == EOF) |
shoaib_ahmed | 0:791a779d6220 | 115 | ERREXIT(cinfo, JERR_INPUT_EOF); |
shoaib_ahmed | 0:791a779d6220 | 116 | } while (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r'); |
shoaib_ahmed | 0:791a779d6220 | 117 | |
shoaib_ahmed | 0:791a779d6220 | 118 | if (ch < '0' || ch > '9') |
shoaib_ahmed | 0:791a779d6220 | 119 | ERREXIT(cinfo, JERR_PPM_NONNUMERIC); |
shoaib_ahmed | 0:791a779d6220 | 120 | |
shoaib_ahmed | 0:791a779d6220 | 121 | val = ch - '0'; |
shoaib_ahmed | 0:791a779d6220 | 122 | while ((ch = pbm_getc(infile)) >= '0' && ch <= '9') { |
shoaib_ahmed | 0:791a779d6220 | 123 | val *= 10; |
shoaib_ahmed | 0:791a779d6220 | 124 | val += ch - '0'; |
shoaib_ahmed | 0:791a779d6220 | 125 | } |
shoaib_ahmed | 0:791a779d6220 | 126 | return val; |
shoaib_ahmed | 0:791a779d6220 | 127 | } |
shoaib_ahmed | 0:791a779d6220 | 128 | |
shoaib_ahmed | 0:791a779d6220 | 129 | |
shoaib_ahmed | 0:791a779d6220 | 130 | /* |
shoaib_ahmed | 0:791a779d6220 | 131 | * Read one row of pixels. |
shoaib_ahmed | 0:791a779d6220 | 132 | * |
shoaib_ahmed | 0:791a779d6220 | 133 | * We provide several different versions depending on input file format. |
shoaib_ahmed | 0:791a779d6220 | 134 | * In all cases, input is scaled to the size of JSAMPLE. |
shoaib_ahmed | 0:791a779d6220 | 135 | * |
shoaib_ahmed | 0:791a779d6220 | 136 | * A really fast path is provided for reading byte/sample raw files with |
shoaib_ahmed | 0:791a779d6220 | 137 | * maxval = MAXJSAMPLE, which is the normal case for 8-bit data. |
shoaib_ahmed | 0:791a779d6220 | 138 | */ |
shoaib_ahmed | 0:791a779d6220 | 139 | |
shoaib_ahmed | 0:791a779d6220 | 140 | |
shoaib_ahmed | 0:791a779d6220 | 141 | METHODDEF(JDIMENSION) |
shoaib_ahmed | 0:791a779d6220 | 142 | get_text_gray_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
shoaib_ahmed | 0:791a779d6220 | 143 | /* This version is for reading text-format PGM files with any maxval */ |
shoaib_ahmed | 0:791a779d6220 | 144 | { |
shoaib_ahmed | 0:791a779d6220 | 145 | ppm_source_ptr source = (ppm_source_ptr) sinfo; |
shoaib_ahmed | 0:791a779d6220 | 146 | FILE * infile = source->pub.input_file; |
shoaib_ahmed | 0:791a779d6220 | 147 | register JSAMPROW ptr; |
shoaib_ahmed | 0:791a779d6220 | 148 | register JSAMPLE *rescale = source->rescale; |
shoaib_ahmed | 0:791a779d6220 | 149 | JDIMENSION col; |
shoaib_ahmed | 0:791a779d6220 | 150 | |
shoaib_ahmed | 0:791a779d6220 | 151 | ptr = source->pub.buffer[0]; |
shoaib_ahmed | 0:791a779d6220 | 152 | for (col = cinfo->image_width; col > 0; col--) { |
shoaib_ahmed | 0:791a779d6220 | 153 | *ptr++ = rescale[read_pbm_integer(cinfo, infile)]; |
shoaib_ahmed | 0:791a779d6220 | 154 | } |
shoaib_ahmed | 0:791a779d6220 | 155 | return 1; |
shoaib_ahmed | 0:791a779d6220 | 156 | } |
shoaib_ahmed | 0:791a779d6220 | 157 | |
shoaib_ahmed | 0:791a779d6220 | 158 | |
shoaib_ahmed | 0:791a779d6220 | 159 | METHODDEF(JDIMENSION) |
shoaib_ahmed | 0:791a779d6220 | 160 | get_text_rgb_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
shoaib_ahmed | 0:791a779d6220 | 161 | /* This version is for reading text-format PPM files with any maxval */ |
shoaib_ahmed | 0:791a779d6220 | 162 | { |
shoaib_ahmed | 0:791a779d6220 | 163 | ppm_source_ptr source = (ppm_source_ptr) sinfo; |
shoaib_ahmed | 0:791a779d6220 | 164 | FILE * infile = source->pub.input_file; |
shoaib_ahmed | 0:791a779d6220 | 165 | register JSAMPROW ptr; |
shoaib_ahmed | 0:791a779d6220 | 166 | register JSAMPLE *rescale = source->rescale; |
shoaib_ahmed | 0:791a779d6220 | 167 | JDIMENSION col; |
shoaib_ahmed | 0:791a779d6220 | 168 | |
shoaib_ahmed | 0:791a779d6220 | 169 | ptr = source->pub.buffer[0]; |
shoaib_ahmed | 0:791a779d6220 | 170 | for (col = cinfo->image_width; col > 0; col--) { |
shoaib_ahmed | 0:791a779d6220 | 171 | *ptr++ = rescale[read_pbm_integer(cinfo, infile)]; |
shoaib_ahmed | 0:791a779d6220 | 172 | *ptr++ = rescale[read_pbm_integer(cinfo, infile)]; |
shoaib_ahmed | 0:791a779d6220 | 173 | *ptr++ = rescale[read_pbm_integer(cinfo, infile)]; |
shoaib_ahmed | 0:791a779d6220 | 174 | } |
shoaib_ahmed | 0:791a779d6220 | 175 | return 1; |
shoaib_ahmed | 0:791a779d6220 | 176 | } |
shoaib_ahmed | 0:791a779d6220 | 177 | |
shoaib_ahmed | 0:791a779d6220 | 178 | |
shoaib_ahmed | 0:791a779d6220 | 179 | METHODDEF(JDIMENSION) |
shoaib_ahmed | 0:791a779d6220 | 180 | get_scaled_gray_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
shoaib_ahmed | 0:791a779d6220 | 181 | /* This version is for reading raw-byte-format PGM files with any maxval */ |
shoaib_ahmed | 0:791a779d6220 | 182 | { |
shoaib_ahmed | 0:791a779d6220 | 183 | ppm_source_ptr source = (ppm_source_ptr) sinfo; |
shoaib_ahmed | 0:791a779d6220 | 184 | register JSAMPROW ptr; |
shoaib_ahmed | 0:791a779d6220 | 185 | register U_CHAR * bufferptr; |
shoaib_ahmed | 0:791a779d6220 | 186 | register JSAMPLE *rescale = source->rescale; |
shoaib_ahmed | 0:791a779d6220 | 187 | JDIMENSION col; |
shoaib_ahmed | 0:791a779d6220 | 188 | |
shoaib_ahmed | 0:791a779d6220 | 189 | if (! ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width)) |
shoaib_ahmed | 0:791a779d6220 | 190 | ERREXIT(cinfo, JERR_INPUT_EOF); |
shoaib_ahmed | 0:791a779d6220 | 191 | ptr = source->pub.buffer[0]; |
shoaib_ahmed | 0:791a779d6220 | 192 | bufferptr = source->iobuffer; |
shoaib_ahmed | 0:791a779d6220 | 193 | for (col = cinfo->image_width; col > 0; col--) { |
shoaib_ahmed | 0:791a779d6220 | 194 | *ptr++ = rescale[UCH(*bufferptr++)]; |
shoaib_ahmed | 0:791a779d6220 | 195 | } |
shoaib_ahmed | 0:791a779d6220 | 196 | return 1; |
shoaib_ahmed | 0:791a779d6220 | 197 | } |
shoaib_ahmed | 0:791a779d6220 | 198 | |
shoaib_ahmed | 0:791a779d6220 | 199 | |
shoaib_ahmed | 0:791a779d6220 | 200 | METHODDEF(JDIMENSION) |
shoaib_ahmed | 0:791a779d6220 | 201 | get_scaled_rgb_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
shoaib_ahmed | 0:791a779d6220 | 202 | /* This version is for reading raw-byte-format PPM files with any maxval */ |
shoaib_ahmed | 0:791a779d6220 | 203 | { |
shoaib_ahmed | 0:791a779d6220 | 204 | ppm_source_ptr source = (ppm_source_ptr) sinfo; |
shoaib_ahmed | 0:791a779d6220 | 205 | register JSAMPROW ptr; |
shoaib_ahmed | 0:791a779d6220 | 206 | register U_CHAR * bufferptr; |
shoaib_ahmed | 0:791a779d6220 | 207 | register JSAMPLE *rescale = source->rescale; |
shoaib_ahmed | 0:791a779d6220 | 208 | JDIMENSION col; |
shoaib_ahmed | 0:791a779d6220 | 209 | |
shoaib_ahmed | 0:791a779d6220 | 210 | if (! ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width)) |
shoaib_ahmed | 0:791a779d6220 | 211 | ERREXIT(cinfo, JERR_INPUT_EOF); |
shoaib_ahmed | 0:791a779d6220 | 212 | ptr = source->pub.buffer[0]; |
shoaib_ahmed | 0:791a779d6220 | 213 | bufferptr = source->iobuffer; |
shoaib_ahmed | 0:791a779d6220 | 214 | for (col = cinfo->image_width; col > 0; col--) { |
shoaib_ahmed | 0:791a779d6220 | 215 | *ptr++ = rescale[UCH(*bufferptr++)]; |
shoaib_ahmed | 0:791a779d6220 | 216 | *ptr++ = rescale[UCH(*bufferptr++)]; |
shoaib_ahmed | 0:791a779d6220 | 217 | *ptr++ = rescale[UCH(*bufferptr++)]; |
shoaib_ahmed | 0:791a779d6220 | 218 | } |
shoaib_ahmed | 0:791a779d6220 | 219 | return 1; |
shoaib_ahmed | 0:791a779d6220 | 220 | } |
shoaib_ahmed | 0:791a779d6220 | 221 | |
shoaib_ahmed | 0:791a779d6220 | 222 | |
shoaib_ahmed | 0:791a779d6220 | 223 | METHODDEF(JDIMENSION) |
shoaib_ahmed | 0:791a779d6220 | 224 | get_raw_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
shoaib_ahmed | 0:791a779d6220 | 225 | /* This version is for reading raw-byte-format files with maxval = MAXJSAMPLE. |
shoaib_ahmed | 0:791a779d6220 | 226 | * In this case we just read right into the JSAMPLE buffer! |
shoaib_ahmed | 0:791a779d6220 | 227 | * Note that same code works for PPM and PGM files. |
shoaib_ahmed | 0:791a779d6220 | 228 | */ |
shoaib_ahmed | 0:791a779d6220 | 229 | { |
shoaib_ahmed | 0:791a779d6220 | 230 | ppm_source_ptr source = (ppm_source_ptr) sinfo; |
shoaib_ahmed | 0:791a779d6220 | 231 | |
shoaib_ahmed | 0:791a779d6220 | 232 | if (! ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width)) |
shoaib_ahmed | 0:791a779d6220 | 233 | ERREXIT(cinfo, JERR_INPUT_EOF); |
shoaib_ahmed | 0:791a779d6220 | 234 | return 1; |
shoaib_ahmed | 0:791a779d6220 | 235 | } |
shoaib_ahmed | 0:791a779d6220 | 236 | |
shoaib_ahmed | 0:791a779d6220 | 237 | |
shoaib_ahmed | 0:791a779d6220 | 238 | METHODDEF(JDIMENSION) |
shoaib_ahmed | 0:791a779d6220 | 239 | get_word_gray_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
shoaib_ahmed | 0:791a779d6220 | 240 | /* This version is for reading raw-word-format PGM files with any maxval */ |
shoaib_ahmed | 0:791a779d6220 | 241 | { |
shoaib_ahmed | 0:791a779d6220 | 242 | ppm_source_ptr source = (ppm_source_ptr) sinfo; |
shoaib_ahmed | 0:791a779d6220 | 243 | register JSAMPROW ptr; |
shoaib_ahmed | 0:791a779d6220 | 244 | register U_CHAR * bufferptr; |
shoaib_ahmed | 0:791a779d6220 | 245 | register JSAMPLE *rescale = source->rescale; |
shoaib_ahmed | 0:791a779d6220 | 246 | JDIMENSION col; |
shoaib_ahmed | 0:791a779d6220 | 247 | |
shoaib_ahmed | 0:791a779d6220 | 248 | if (! ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width)) |
shoaib_ahmed | 0:791a779d6220 | 249 | ERREXIT(cinfo, JERR_INPUT_EOF); |
shoaib_ahmed | 0:791a779d6220 | 250 | ptr = source->pub.buffer[0]; |
shoaib_ahmed | 0:791a779d6220 | 251 | bufferptr = source->iobuffer; |
shoaib_ahmed | 0:791a779d6220 | 252 | for (col = cinfo->image_width; col > 0; col--) { |
shoaib_ahmed | 0:791a779d6220 | 253 | register int temp; |
shoaib_ahmed | 0:791a779d6220 | 254 | temp = UCH(*bufferptr++) << 8; |
shoaib_ahmed | 0:791a779d6220 | 255 | temp |= UCH(*bufferptr++); |
shoaib_ahmed | 0:791a779d6220 | 256 | *ptr++ = rescale[temp]; |
shoaib_ahmed | 0:791a779d6220 | 257 | } |
shoaib_ahmed | 0:791a779d6220 | 258 | return 1; |
shoaib_ahmed | 0:791a779d6220 | 259 | } |
shoaib_ahmed | 0:791a779d6220 | 260 | |
shoaib_ahmed | 0:791a779d6220 | 261 | |
shoaib_ahmed | 0:791a779d6220 | 262 | METHODDEF(JDIMENSION) |
shoaib_ahmed | 0:791a779d6220 | 263 | get_word_rgb_row (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
shoaib_ahmed | 0:791a779d6220 | 264 | /* This version is for reading raw-word-format PPM files with any maxval */ |
shoaib_ahmed | 0:791a779d6220 | 265 | { |
shoaib_ahmed | 0:791a779d6220 | 266 | ppm_source_ptr source = (ppm_source_ptr) sinfo; |
shoaib_ahmed | 0:791a779d6220 | 267 | register JSAMPROW ptr; |
shoaib_ahmed | 0:791a779d6220 | 268 | register U_CHAR * bufferptr; |
shoaib_ahmed | 0:791a779d6220 | 269 | register JSAMPLE *rescale = source->rescale; |
shoaib_ahmed | 0:791a779d6220 | 270 | JDIMENSION col; |
shoaib_ahmed | 0:791a779d6220 | 271 | |
shoaib_ahmed | 0:791a779d6220 | 272 | if (! ReadOK(source->pub.input_file, source->iobuffer, source->buffer_width)) |
shoaib_ahmed | 0:791a779d6220 | 273 | ERREXIT(cinfo, JERR_INPUT_EOF); |
shoaib_ahmed | 0:791a779d6220 | 274 | ptr = source->pub.buffer[0]; |
shoaib_ahmed | 0:791a779d6220 | 275 | bufferptr = source->iobuffer; |
shoaib_ahmed | 0:791a779d6220 | 276 | for (col = cinfo->image_width; col > 0; col--) { |
shoaib_ahmed | 0:791a779d6220 | 277 | register int temp; |
shoaib_ahmed | 0:791a779d6220 | 278 | temp = UCH(*bufferptr++) << 8; |
shoaib_ahmed | 0:791a779d6220 | 279 | temp |= UCH(*bufferptr++); |
shoaib_ahmed | 0:791a779d6220 | 280 | *ptr++ = rescale[temp]; |
shoaib_ahmed | 0:791a779d6220 | 281 | temp = UCH(*bufferptr++) << 8; |
shoaib_ahmed | 0:791a779d6220 | 282 | temp |= UCH(*bufferptr++); |
shoaib_ahmed | 0:791a779d6220 | 283 | *ptr++ = rescale[temp]; |
shoaib_ahmed | 0:791a779d6220 | 284 | temp = UCH(*bufferptr++) << 8; |
shoaib_ahmed | 0:791a779d6220 | 285 | temp |= UCH(*bufferptr++); |
shoaib_ahmed | 0:791a779d6220 | 286 | *ptr++ = rescale[temp]; |
shoaib_ahmed | 0:791a779d6220 | 287 | } |
shoaib_ahmed | 0:791a779d6220 | 288 | return 1; |
shoaib_ahmed | 0:791a779d6220 | 289 | } |
shoaib_ahmed | 0:791a779d6220 | 290 | |
shoaib_ahmed | 0:791a779d6220 | 291 | |
shoaib_ahmed | 0:791a779d6220 | 292 | /* |
shoaib_ahmed | 0:791a779d6220 | 293 | * Read the file header; return image size and component count. |
shoaib_ahmed | 0:791a779d6220 | 294 | */ |
shoaib_ahmed | 0:791a779d6220 | 295 | |
shoaib_ahmed | 0:791a779d6220 | 296 | METHODDEF(void) |
shoaib_ahmed | 0:791a779d6220 | 297 | start_input_ppm (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
shoaib_ahmed | 0:791a779d6220 | 298 | { |
shoaib_ahmed | 0:791a779d6220 | 299 | ppm_source_ptr source = (ppm_source_ptr) sinfo; |
shoaib_ahmed | 0:791a779d6220 | 300 | int c; |
shoaib_ahmed | 0:791a779d6220 | 301 | unsigned int w, h, maxval; |
shoaib_ahmed | 0:791a779d6220 | 302 | boolean need_iobuffer, use_raw_buffer, need_rescale; |
shoaib_ahmed | 0:791a779d6220 | 303 | |
shoaib_ahmed | 0:791a779d6220 | 304 | if (getc(source->pub.input_file) != 'P') |
shoaib_ahmed | 0:791a779d6220 | 305 | ERREXIT(cinfo, JERR_PPM_NOT); |
shoaib_ahmed | 0:791a779d6220 | 306 | |
shoaib_ahmed | 0:791a779d6220 | 307 | c = getc(source->pub.input_file); /* subformat discriminator character */ |
shoaib_ahmed | 0:791a779d6220 | 308 | |
shoaib_ahmed | 0:791a779d6220 | 309 | /* detect unsupported variants (ie, PBM) before trying to read header */ |
shoaib_ahmed | 0:791a779d6220 | 310 | switch (c) { |
shoaib_ahmed | 0:791a779d6220 | 311 | case '2': /* it's a text-format PGM file */ |
shoaib_ahmed | 0:791a779d6220 | 312 | case '3': /* it's a text-format PPM file */ |
shoaib_ahmed | 0:791a779d6220 | 313 | case '5': /* it's a raw-format PGM file */ |
shoaib_ahmed | 0:791a779d6220 | 314 | case '6': /* it's a raw-format PPM file */ |
shoaib_ahmed | 0:791a779d6220 | 315 | break; |
shoaib_ahmed | 0:791a779d6220 | 316 | default: |
shoaib_ahmed | 0:791a779d6220 | 317 | ERREXIT(cinfo, JERR_PPM_NOT); |
shoaib_ahmed | 0:791a779d6220 | 318 | break; |
shoaib_ahmed | 0:791a779d6220 | 319 | } |
shoaib_ahmed | 0:791a779d6220 | 320 | |
shoaib_ahmed | 0:791a779d6220 | 321 | /* fetch the remaining header info */ |
shoaib_ahmed | 0:791a779d6220 | 322 | w = read_pbm_integer(cinfo, source->pub.input_file); |
shoaib_ahmed | 0:791a779d6220 | 323 | h = read_pbm_integer(cinfo, source->pub.input_file); |
shoaib_ahmed | 0:791a779d6220 | 324 | maxval = read_pbm_integer(cinfo, source->pub.input_file); |
shoaib_ahmed | 0:791a779d6220 | 325 | |
shoaib_ahmed | 0:791a779d6220 | 326 | if (w <= 0 || h <= 0 || maxval <= 0) /* error check */ |
shoaib_ahmed | 0:791a779d6220 | 327 | ERREXIT(cinfo, JERR_PPM_NOT); |
shoaib_ahmed | 0:791a779d6220 | 328 | |
shoaib_ahmed | 0:791a779d6220 | 329 | cinfo->data_precision = BITS_IN_JSAMPLE; /* we always rescale data to this */ |
shoaib_ahmed | 0:791a779d6220 | 330 | cinfo->image_width = (JDIMENSION) w; |
shoaib_ahmed | 0:791a779d6220 | 331 | cinfo->image_height = (JDIMENSION) h; |
shoaib_ahmed | 0:791a779d6220 | 332 | |
shoaib_ahmed | 0:791a779d6220 | 333 | /* initialize flags to most common settings */ |
shoaib_ahmed | 0:791a779d6220 | 334 | need_iobuffer = TRUE; /* do we need an I/O buffer? */ |
shoaib_ahmed | 0:791a779d6220 | 335 | use_raw_buffer = FALSE; /* do we map input buffer onto I/O buffer? */ |
shoaib_ahmed | 0:791a779d6220 | 336 | need_rescale = TRUE; /* do we need a rescale array? */ |
shoaib_ahmed | 0:791a779d6220 | 337 | |
shoaib_ahmed | 0:791a779d6220 | 338 | switch (c) { |
shoaib_ahmed | 0:791a779d6220 | 339 | case '2': /* it's a text-format PGM file */ |
shoaib_ahmed | 0:791a779d6220 | 340 | cinfo->input_components = 1; |
shoaib_ahmed | 0:791a779d6220 | 341 | cinfo->in_color_space = JCS_GRAYSCALE; |
shoaib_ahmed | 0:791a779d6220 | 342 | TRACEMS2(cinfo, 1, JTRC_PGM_TEXT, w, h); |
shoaib_ahmed | 0:791a779d6220 | 343 | source->pub.get_pixel_rows = get_text_gray_row; |
shoaib_ahmed | 0:791a779d6220 | 344 | need_iobuffer = FALSE; |
shoaib_ahmed | 0:791a779d6220 | 345 | break; |
shoaib_ahmed | 0:791a779d6220 | 346 | |
shoaib_ahmed | 0:791a779d6220 | 347 | case '3': /* it's a text-format PPM file */ |
shoaib_ahmed | 0:791a779d6220 | 348 | cinfo->input_components = 3; |
shoaib_ahmed | 0:791a779d6220 | 349 | cinfo->in_color_space = JCS_RGB; |
shoaib_ahmed | 0:791a779d6220 | 350 | TRACEMS2(cinfo, 1, JTRC_PPM_TEXT, w, h); |
shoaib_ahmed | 0:791a779d6220 | 351 | source->pub.get_pixel_rows = get_text_rgb_row; |
shoaib_ahmed | 0:791a779d6220 | 352 | need_iobuffer = FALSE; |
shoaib_ahmed | 0:791a779d6220 | 353 | break; |
shoaib_ahmed | 0:791a779d6220 | 354 | |
shoaib_ahmed | 0:791a779d6220 | 355 | case '5': /* it's a raw-format PGM file */ |
shoaib_ahmed | 0:791a779d6220 | 356 | cinfo->input_components = 1; |
shoaib_ahmed | 0:791a779d6220 | 357 | cinfo->in_color_space = JCS_GRAYSCALE; |
shoaib_ahmed | 0:791a779d6220 | 358 | TRACEMS2(cinfo, 1, JTRC_PGM, w, h); |
shoaib_ahmed | 0:791a779d6220 | 359 | if (maxval > 255) { |
shoaib_ahmed | 0:791a779d6220 | 360 | source->pub.get_pixel_rows = get_word_gray_row; |
shoaib_ahmed | 0:791a779d6220 | 361 | } else if (maxval == MAXJSAMPLE && SIZEOF(JSAMPLE) == SIZEOF(U_CHAR)) { |
shoaib_ahmed | 0:791a779d6220 | 362 | source->pub.get_pixel_rows = get_raw_row; |
shoaib_ahmed | 0:791a779d6220 | 363 | use_raw_buffer = TRUE; |
shoaib_ahmed | 0:791a779d6220 | 364 | need_rescale = FALSE; |
shoaib_ahmed | 0:791a779d6220 | 365 | } else { |
shoaib_ahmed | 0:791a779d6220 | 366 | source->pub.get_pixel_rows = get_scaled_gray_row; |
shoaib_ahmed | 0:791a779d6220 | 367 | } |
shoaib_ahmed | 0:791a779d6220 | 368 | break; |
shoaib_ahmed | 0:791a779d6220 | 369 | |
shoaib_ahmed | 0:791a779d6220 | 370 | case '6': /* it's a raw-format PPM file */ |
shoaib_ahmed | 0:791a779d6220 | 371 | cinfo->input_components = 3; |
shoaib_ahmed | 0:791a779d6220 | 372 | cinfo->in_color_space = JCS_RGB; |
shoaib_ahmed | 0:791a779d6220 | 373 | TRACEMS2(cinfo, 1, JTRC_PPM, w, h); |
shoaib_ahmed | 0:791a779d6220 | 374 | if (maxval > 255) { |
shoaib_ahmed | 0:791a779d6220 | 375 | source->pub.get_pixel_rows = get_word_rgb_row; |
shoaib_ahmed | 0:791a779d6220 | 376 | } else if (maxval == MAXJSAMPLE && SIZEOF(JSAMPLE) == SIZEOF(U_CHAR)) { |
shoaib_ahmed | 0:791a779d6220 | 377 | source->pub.get_pixel_rows = get_raw_row; |
shoaib_ahmed | 0:791a779d6220 | 378 | use_raw_buffer = TRUE; |
shoaib_ahmed | 0:791a779d6220 | 379 | need_rescale = FALSE; |
shoaib_ahmed | 0:791a779d6220 | 380 | } else { |
shoaib_ahmed | 0:791a779d6220 | 381 | source->pub.get_pixel_rows = get_scaled_rgb_row; |
shoaib_ahmed | 0:791a779d6220 | 382 | } |
shoaib_ahmed | 0:791a779d6220 | 383 | break; |
shoaib_ahmed | 0:791a779d6220 | 384 | } |
shoaib_ahmed | 0:791a779d6220 | 385 | |
shoaib_ahmed | 0:791a779d6220 | 386 | /* Allocate space for I/O buffer: 1 or 3 bytes or words/pixel. */ |
shoaib_ahmed | 0:791a779d6220 | 387 | if (need_iobuffer) { |
shoaib_ahmed | 0:791a779d6220 | 388 | source->buffer_width = (size_t) w * cinfo->input_components * |
shoaib_ahmed | 0:791a779d6220 | 389 | ((maxval<=255) ? SIZEOF(U_CHAR) : (2*SIZEOF(U_CHAR))); |
shoaib_ahmed | 0:791a779d6220 | 390 | source->iobuffer = (U_CHAR *) |
shoaib_ahmed | 0:791a779d6220 | 391 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
shoaib_ahmed | 0:791a779d6220 | 392 | source->buffer_width); |
shoaib_ahmed | 0:791a779d6220 | 393 | } |
shoaib_ahmed | 0:791a779d6220 | 394 | |
shoaib_ahmed | 0:791a779d6220 | 395 | /* Create compressor input buffer. */ |
shoaib_ahmed | 0:791a779d6220 | 396 | if (use_raw_buffer) { |
shoaib_ahmed | 0:791a779d6220 | 397 | /* For unscaled raw-input case, we can just map it onto the I/O buffer. */ |
shoaib_ahmed | 0:791a779d6220 | 398 | /* Synthesize a JSAMPARRAY pointer structure */ |
shoaib_ahmed | 0:791a779d6220 | 399 | /* Cast here implies near->far pointer conversion on PCs */ |
shoaib_ahmed | 0:791a779d6220 | 400 | source->pixrow = (JSAMPROW) source->iobuffer; |
shoaib_ahmed | 0:791a779d6220 | 401 | source->pub.buffer = & source->pixrow; |
shoaib_ahmed | 0:791a779d6220 | 402 | source->pub.buffer_height = 1; |
shoaib_ahmed | 0:791a779d6220 | 403 | } else { |
shoaib_ahmed | 0:791a779d6220 | 404 | /* Need to translate anyway, so make a separate sample buffer. */ |
shoaib_ahmed | 0:791a779d6220 | 405 | source->pub.buffer = (*cinfo->mem->alloc_sarray) |
shoaib_ahmed | 0:791a779d6220 | 406 | ((j_common_ptr) cinfo, JPOOL_IMAGE, |
shoaib_ahmed | 0:791a779d6220 | 407 | (JDIMENSION) w * cinfo->input_components, (JDIMENSION) 1); |
shoaib_ahmed | 0:791a779d6220 | 408 | source->pub.buffer_height = 1; |
shoaib_ahmed | 0:791a779d6220 | 409 | } |
shoaib_ahmed | 0:791a779d6220 | 410 | |
shoaib_ahmed | 0:791a779d6220 | 411 | /* Compute the rescaling array if required. */ |
shoaib_ahmed | 0:791a779d6220 | 412 | if (need_rescale) { |
shoaib_ahmed | 0:791a779d6220 | 413 | INT32 val, half_maxval; |
shoaib_ahmed | 0:791a779d6220 | 414 | |
shoaib_ahmed | 0:791a779d6220 | 415 | /* On 16-bit-int machines we have to be careful of maxval = 65535 */ |
shoaib_ahmed | 0:791a779d6220 | 416 | source->rescale = (JSAMPLE *) |
shoaib_ahmed | 0:791a779d6220 | 417 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
shoaib_ahmed | 0:791a779d6220 | 418 | (size_t) (((long) maxval + 1L) * SIZEOF(JSAMPLE))); |
shoaib_ahmed | 0:791a779d6220 | 419 | half_maxval = maxval / 2; |
shoaib_ahmed | 0:791a779d6220 | 420 | for (val = 0; val <= (INT32) maxval; val++) { |
shoaib_ahmed | 0:791a779d6220 | 421 | /* The multiplication here must be done in 32 bits to avoid overflow */ |
shoaib_ahmed | 0:791a779d6220 | 422 | source->rescale[val] = (JSAMPLE) ((val*MAXJSAMPLE + half_maxval)/maxval); |
shoaib_ahmed | 0:791a779d6220 | 423 | } |
shoaib_ahmed | 0:791a779d6220 | 424 | } |
shoaib_ahmed | 0:791a779d6220 | 425 | } |
shoaib_ahmed | 0:791a779d6220 | 426 | |
shoaib_ahmed | 0:791a779d6220 | 427 | |
shoaib_ahmed | 0:791a779d6220 | 428 | /* |
shoaib_ahmed | 0:791a779d6220 | 429 | * Finish up at the end of the file. |
shoaib_ahmed | 0:791a779d6220 | 430 | */ |
shoaib_ahmed | 0:791a779d6220 | 431 | |
shoaib_ahmed | 0:791a779d6220 | 432 | METHODDEF(void) |
shoaib_ahmed | 0:791a779d6220 | 433 | finish_input_ppm (j_compress_ptr cinfo, cjpeg_source_ptr sinfo) |
shoaib_ahmed | 0:791a779d6220 | 434 | { |
shoaib_ahmed | 0:791a779d6220 | 435 | /* no work */ |
shoaib_ahmed | 0:791a779d6220 | 436 | } |
shoaib_ahmed | 0:791a779d6220 | 437 | |
shoaib_ahmed | 0:791a779d6220 | 438 | |
shoaib_ahmed | 0:791a779d6220 | 439 | /* |
shoaib_ahmed | 0:791a779d6220 | 440 | * The module selection routine for PPM format input. |
shoaib_ahmed | 0:791a779d6220 | 441 | */ |
shoaib_ahmed | 0:791a779d6220 | 442 | |
shoaib_ahmed | 0:791a779d6220 | 443 | GLOBAL(cjpeg_source_ptr) |
shoaib_ahmed | 0:791a779d6220 | 444 | jinit_read_ppm (j_compress_ptr cinfo) |
shoaib_ahmed | 0:791a779d6220 | 445 | { |
shoaib_ahmed | 0:791a779d6220 | 446 | ppm_source_ptr source; |
shoaib_ahmed | 0:791a779d6220 | 447 | |
shoaib_ahmed | 0:791a779d6220 | 448 | /* Create module interface object */ |
shoaib_ahmed | 0:791a779d6220 | 449 | source = (ppm_source_ptr) |
shoaib_ahmed | 0:791a779d6220 | 450 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, |
shoaib_ahmed | 0:791a779d6220 | 451 | SIZEOF(ppm_source_struct)); |
shoaib_ahmed | 0:791a779d6220 | 452 | /* Fill in method ptrs, except get_pixel_rows which start_input sets */ |
shoaib_ahmed | 0:791a779d6220 | 453 | source->pub.start_input = start_input_ppm; |
shoaib_ahmed | 0:791a779d6220 | 454 | source->pub.finish_input = finish_input_ppm; |
shoaib_ahmed | 0:791a779d6220 | 455 | |
shoaib_ahmed | 0:791a779d6220 | 456 | return (cjpeg_source_ptr) source; |
shoaib_ahmed | 0:791a779d6220 | 457 | } |
shoaib_ahmed | 0:791a779d6220 | 458 | |
shoaib_ahmed | 0:791a779d6220 | 459 | #endif /* PPM_SUPPORTED */ |