/*
* jpegtran.c
*
- * Copyright (C) 1995-1997, Thomas G. Lane.
+ * Copyright (C) 1995-2013, Thomas G. Lane, Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README file.
*
* This file contains a command-line user interface for JPEG transcoding.
- * It is very similar to cjpeg.c, but provides lossless transcoding between
- * different JPEG file formats. It also provides some lossless and sort-of-
- * lossless transformations of JPEG data.
+ * It is very similar to cjpeg.c, and partly to djpeg.c, but provides
+ * lossless transcoding between different JPEG file formats. It also
+ * provides some lossless and sort-of-lossless transformations of JPEG data.
*/
#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
static const char * progname; /* program name for error messages */
static char * outfilename; /* for -outfile switch */
+static char * scaleoption; /* -scale switch */
static JCOPY_OPTION copyoption; /* -copy switch */
static jpeg_transform_info transformoption; /* image transformation options */
#ifdef C_PROGRESSIVE_SUPPORTED
fprintf(stderr, " -progressive Create progressive JPEG file\n");
#endif
-#if TRANSFORMS_SUPPORTED
fprintf(stderr, "Switches for modifying the image:\n");
- fprintf(stderr, " -grayscale Reduce to grayscale (omit color data)\n");
+#if TRANSFORMS_SUPPORTED
+ fprintf(stderr, " -crop WxH+X+Y Crop to a rectangular subarea\n");
fprintf(stderr, " -flip [horizontal|vertical] Mirror image (left-right or top-bottom)\n");
+ fprintf(stderr, " -grayscale Reduce to grayscale (omit color data)\n");
+ fprintf(stderr, " -perfect Fail if there is non-transformable edge blocks\n");
fprintf(stderr, " -rotate [90|180|270] Rotate image (degrees clockwise)\n");
+#endif
+ fprintf(stderr, " -scale M/N Scale output image by fraction M/N, eg, 1/8\n");
+#if TRANSFORMS_SUPPORTED
fprintf(stderr, " -transpose Transpose image\n");
fprintf(stderr, " -transverse Transverse transpose image\n");
fprintf(stderr, " -trim Drop non-transformable edge blocks\n");
-#endif /* TRANSFORMS_SUPPORTED */
+ fprintf(stderr, " -wipe WxH+X+Y Wipe (gray out) a rectangular subarea\n");
+#endif
fprintf(stderr, "Switches for advanced users:\n");
+#ifdef C_ARITH_CODING_SUPPORTED
+ fprintf(stderr, " -arithmetic Use arithmetic coding\n");
+#endif
fprintf(stderr, " -restart N Set restart interval in rows, or in blocks with B\n");
fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n");
fprintf(stderr, " -outfile name Specify name for output file\n");
fprintf(stderr, " -verbose or -debug Emit debug output\n");
fprintf(stderr, "Switches for wizards:\n");
-#ifdef C_ARITH_CODING_SUPPORTED
- fprintf(stderr, " -arithmetic Use arithmetic coding\n");
-#endif
#ifdef C_MULTISCAN_FILES_SUPPORTED
fprintf(stderr, " -scans file Create multi-scan JPEG per script file\n");
#endif
/* Set up default JPEG parameters. */
simple_progressive = FALSE;
outfilename = NULL;
+ scaleoption = NULL;
copyoption = JCOPYOPT_DEFAULT;
transformoption.transform = JXFORM_NONE;
+ transformoption.perfect = FALSE;
transformoption.trim = FALSE;
transformoption.force_grayscale = FALSE;
+ transformoption.crop = FALSE;
cinfo->err->trace_level = 0;
/* Scan command line options, adjust parameters */
exit(EXIT_FAILURE);
#endif
- } else if (keymatch(arg, "copy", 1)) {
+ } else if (keymatch(arg, "copy", 2)) {
/* Select which extra markers to copy. */
if (++argn >= argc) /* advance to next argument */
usage();
} else
usage();
+ } else if (keymatch(arg, "crop", 2)) {
+ /* Perform lossless cropping. */
+#if TRANSFORMS_SUPPORTED
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ if (transformoption.crop /* reject multiple crop/wipe requests */ ||
+ ! jtransform_parse_crop_spec(&transformoption, argv[argn])) {
+ fprintf(stderr, "%s: bogus -crop argument '%s'\n",
+ progname, argv[argn]);
+ exit(EXIT_FAILURE);
+ }
+#else
+ select_transform(JXFORM_NONE); /* force an error */
+#endif
+
} else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
/* Enable debug printouts. */
/* On first -d, print version identification */
usage();
outfilename = argv[argn]; /* save it away for later use */
- } else if (keymatch(arg, "progressive", 1)) {
+ } else if (keymatch(arg, "perfect", 2)) {
+ /* Fail if there is any partial edge MCUs that the transform can't
+ * handle. */
+ transformoption.perfect = TRUE;
+
+ } else if (keymatch(arg, "progressive", 2)) {
/* Select simple progressive mode. */
#ifdef C_PROGRESSIVE_SUPPORTED
simple_progressive = TRUE;
else
usage();
+ } else if (keymatch(arg, "scale", 4)) {
+ /* Scale the output image by a fraction M/N. */
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ scaleoption = argv[argn];
+ /* We must postpone processing until decompression startup. */
+
} else if (keymatch(arg, "scans", 1)) {
/* Set scan script. */
#ifdef C_MULTISCAN_FILES_SUPPORTED
/* Trim off any partial edge MCUs that the transform can't handle. */
transformoption.trim = TRUE;
+ } else if (keymatch(arg, "wipe", 1)) {
+#if TRANSFORMS_SUPPORTED
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ if (transformoption.crop /* reject multiple crop/wipe requests */ ||
+ ! jtransform_parse_crop_spec(&transformoption, argv[argn])) {
+ fprintf(stderr, "%s: bogus -wipe argument '%s'\n",
+ progname, argv[argn]);
+ exit(EXIT_FAILURE);
+ }
+ select_transform(JXFORM_WIPE);
+#else
+ select_transform(JXFORM_NONE); /* force an error */
+#endif
+
} else {
usage(); /* bogus switch */
}
jvirt_barray_ptr * src_coef_arrays;
jvirt_barray_ptr * dst_coef_arrays;
int file_index;
- FILE * input_file;
- FILE * output_file;
+ /* We assume all-in-memory processing and can therefore use only a
+ * single file pointer for sequential input and output operation.
+ */
+ FILE * fp;
/* On Mac, fetch a command line. */
#ifdef USE_CCOMMAND
/* Open the input file. */
if (file_index < argc) {
- if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
- fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
+ if ((fp = fopen(argv[file_index], READ_BINARY)) == NULL) {
+ fprintf(stderr, "%s: can't open %s for reading\n", progname, argv[file_index]);
exit(EXIT_FAILURE);
}
} else {
/* default input file is stdin */
- input_file = read_stdin();
- }
-
- /* Open the output file. */
- if (outfilename != NULL) {
- if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
- fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
- exit(EXIT_FAILURE);
- }
- } else {
- /* default output file is stdout */
- output_file = write_stdout();
+ fp = read_stdin();
}
#ifdef PROGRESS_REPORT
#endif
/* Specify data source for decompression */
- jpeg_stdio_src(&srcinfo, input_file);
+ jpeg_stdio_src(&srcinfo, fp);
/* Enable saving of extra markers that we want to copy */
jcopy_markers_setup(&srcinfo, copyoption);
/* Read file header */
(void) jpeg_read_header(&srcinfo, TRUE);
+ /* Adjust default decompression parameters */
+ if (scaleoption != NULL)
+ if (sscanf(scaleoption, "%u/%u",
+ &srcinfo.scale_num, &srcinfo.scale_denom) < 1)
+ usage();
+
/* Any space needed by a transform option must be requested before
* jpeg_read_coefficients so that memory allocation will be done right.
*/
#if TRANSFORMS_SUPPORTED
- jtransform_request_workspace(&srcinfo, &transformoption);
+ /* Fail right away if -perfect is given and transformation is not perfect.
+ */
+ if (!jtransform_request_workspace(&srcinfo, &transformoption)) {
+ fprintf(stderr, "%s: transformation is not perfect\n", progname);
+ exit(EXIT_FAILURE);
+ }
#endif
/* Read source file as DCT coefficients */
dst_coef_arrays = src_coef_arrays;
#endif
+ /* Close input file, if we opened it.
+ * Note: we assume that jpeg_read_coefficients consumed all input
+ * until JPEG_REACHED_EOI, and that jpeg_finish_decompress will
+ * only consume more while (! cinfo->inputctl->eoi_reached).
+ * We cannot call jpeg_finish_decompress here since we still need the
+ * virtual arrays allocated from the source object for processing.
+ */
+ if (fp != stdin)
+ fclose(fp);
+
+ /* Open the output file. */
+ if (outfilename != NULL) {
+ if ((fp = fopen(outfilename, WRITE_BINARY)) == NULL) {
+ fprintf(stderr, "%s: can't open %s for writing\n", progname, outfilename);
+ exit(EXIT_FAILURE);
+ }
+ } else {
+ /* default output file is stdout */
+ fp = write_stdout();
+ }
+
/* Adjust default compression parameters by re-parsing the options */
file_index = parse_switches(&dstinfo, argc, argv, 0, TRUE);
/* Specify data destination for compression */
- jpeg_stdio_dest(&dstinfo, output_file);
+ jpeg_stdio_dest(&dstinfo, fp);
/* Start compressor (note no image data is actually written here) */
jpeg_write_coefficients(&dstinfo, dst_coef_arrays);
(void) jpeg_finish_decompress(&srcinfo);
jpeg_destroy_decompress(&srcinfo);
- /* Close files, if we opened them */
- if (input_file != stdin)
- fclose(input_file);
- if (output_file != stdout)
- fclose(output_file);
+ /* Close output file, if we opened it */
+ if (fp != stdout)
+ fclose(fp);
#ifdef PROGRESS_REPORT
end_progress_monitor((j_common_ptr) &dstinfo);
Ecere Software / sdk / blobdiff