/* pnmcut.c - cut a rectangle out of a portable anymap ** ** Copyright (C) 1989 by Jef Poskanzer. ** ** Permission to use, copy, modify, and distribute this software and its ** documentation for any purpose and without fee is hereby granted, provided ** that the above copyright notice appear in all copies and that both that ** copyright notice and this permission notice appear in supporting ** documentation. This software is provided "as is" without express or ** implied warranty. */ #include #include "pnm.h" #define UNSPEC INT_MAX /* UNSPEC is the value we use for an argument that is not specified by the user. Theoretically, the user could specify this value, but we hope not. */ struct cmdline_info { /* All the information the user supplied in the command line, in a form easy for the program to use. */ char *input_filespec; /* Filespecs of input files */ /* The following describe the rectangle the user wants to cut out. the value UNSPEC for any of them indicates that value was not specified. A negative value means relative to the far edge. 'width' and 'height' are not negative. These specifications do not necessarily describe a valid rectangle; they are just what the user said. */ int left; int right; int top; int bottom; int width; int height; int verbose; }; static void parse_command_line(int argc, char ** argv, struct cmdline_info *cmdline_p) { /*---------------------------------------------------------------------------- Note that the file spec array we return is stored in the storage that was passed to us as the argv array. -----------------------------------------------------------------------------*/ optStruct *option_def = malloc(100*sizeof(optStruct)); /* Instructions to OptParseOptions2 on how to parse our options. */ optStruct2 opt; unsigned int option_def_index; option_def_index = 0; /* incremented by OPTENTRY */ OPTENTRY(0, "left", OPT_INT, &cmdline_p->left, 0); OPTENTRY(0, "right", OPT_INT, &cmdline_p->right, 0); OPTENTRY(0, "top", OPT_INT, &cmdline_p->top, 0); OPTENTRY(0, "bottom", OPT_INT, &cmdline_p->bottom, 0); OPTENTRY(0, "width", OPT_INT, &cmdline_p->width, 0); OPTENTRY(0, "height", OPT_INT, &cmdline_p->height, 0); OPTENTRY(0, "verbose", OPT_FLAG, &cmdline_p->verbose, 0); /* Set the defaults */ cmdline_p->left = UNSPEC; cmdline_p->right = UNSPEC; cmdline_p->top = UNSPEC; cmdline_p->bottom = UNSPEC; cmdline_p->width = UNSPEC; cmdline_p->height = UNSPEC; opt.opt_table = option_def; opt.short_allowed = FALSE; /* We have no short (old-fashioned) options */ opt.allowNegNum = TRUE; /* We may have parms that are negative numbers */ pm_optParseOptions2(&argc, argv, opt, 0); /* Uses and sets argc, argv, and some of *cmdline_p and others. */ if (cmdline_p->width < 0) pm_error("-width may not be negative."); if (cmdline_p->height < 0) pm_error("-height may not be negative."); if ((argc-1) != 0 && (argc-1) != 1 && (argc-1) != 4 && (argc-1) != 5) pm_error("Wrong number of arguments. " "Must be 0, 1, 4, or 5 arguments."); switch (argc-1) { case 0: cmdline_p->input_filespec = "-"; break; case 1: cmdline_p->input_filespec = argv[1]; break; case 4: case 5: { int warg, harg; /* The "width" and "height" command line arguments */ if (sscanf(argv[1], "%d", &cmdline_p->left) != 1) pm_error("Invalid number for left column argument"); if (sscanf(argv[2], "%d", &cmdline_p->top) != 1) pm_error("Invalid number for right column argument"); if (sscanf(argv[3], "%d", &warg) != 1) pm_error("Invalid number for width argument"); if (sscanf(argv[4], "%d", &harg) != 1) pm_error("Invalid number for height argument"); if (warg > 0) { cmdline_p->width = warg; cmdline_p->right = UNSPEC; } else { cmdline_p->width = UNSPEC; cmdline_p->right = warg -1; } if (harg > 0) { cmdline_p->height = harg -1; cmdline_p->bottom = UNSPEC; } else { cmdline_p->height = UNSPEC; cmdline_p->bottom = harg; } if (argc-1 == 4) cmdline_p->input_filespec = "-"; else cmdline_p->input_filespec = argv[5]; break; } } } static void compute_cut_bounds(const int cols, const int rows, const int leftarg, const int rightarg, const int toparg, const int bottomarg, const int widtharg, const int heightarg, int * const leftcol_p, int * const rightcol_p, int * const toprow_p, int * const bottomrow_p) { /*---------------------------------------------------------------------------- From the values given on the command line 'leftarg', 'rightarg', 'toparg', 'bottomarg', 'widtharg', and 'heightarg', determine what rectangle the user wants cut out. Any of these arguments may be UNSPEC to indicate "not specified". Any except 'widtharg' and 'heightarg' may be negative to indicate relative to the far edge. 'widtharg' and 'heightarg' are positive. Return the location of the rectangle as *leftcol_p, *rightcol_p, *toprow_p, and *bottomrow_p. If the selected rectangle is not wholly contained within the image, which has 'cols' columns and 'rows' rows, issue an error message and abort the program. -----------------------------------------------------------------------------*/ int leftcol, rightcol, toprow, bottomrow; /* The left and right column numbers and top and bottom row numbers specified by the user, except with negative values translated into the actual values. Note that these may very well be negative themselves, such as when the user says "column -10" and there are only 5 columns in the image. */ /* Translate negative column and row into real column and row */ /* Exploit the fact that UNSPEC is a positive number */ if (leftarg >= 0) leftcol = leftarg; else leftcol = cols + leftarg; if (rightarg >= 0) rightcol = rightarg; else rightcol = cols + rightarg; if (toparg >= 0) toprow = toparg; else toprow = rows + toparg; if (bottomarg >= 0) bottomrow = bottomarg; else bottomrow = rows + bottomarg; /* Sort out left, right, and width specifications */ if (leftcol == UNSPEC && rightcol == UNSPEC && widtharg == UNSPEC) { *leftcol_p = 0; *rightcol_p = cols - 1; } if (leftcol == UNSPEC && rightcol == UNSPEC && widtharg != UNSPEC) { *leftcol_p = 0; *rightcol_p = 0 + widtharg - 1; } if (leftcol == UNSPEC && rightcol != UNSPEC && widtharg == UNSPEC) { *leftcol_p = 0; *rightcol_p = rightcol; } if (leftcol == UNSPEC && rightcol != UNSPEC && widtharg != UNSPEC) { *leftcol_p = rightcol - widtharg + 1; *rightcol_p = rightcol; } if (leftcol != UNSPEC && rightcol == UNSPEC && widtharg == UNSPEC) { *leftcol_p = leftcol; *rightcol_p = cols - 1; } if (leftcol != UNSPEC && rightcol == UNSPEC && widtharg != UNSPEC) { *leftcol_p = leftcol; *rightcol_p = leftcol + widtharg - 1; } if (leftcol != UNSPEC && rightcol != UNSPEC && widtharg == UNSPEC) { *leftcol_p = leftcol; *rightcol_p = rightcol; } if (leftcol != UNSPEC && rightcol != UNSPEC && widtharg != UNSPEC) { pm_error("You may not specify left, right, and width.\n" "Choose at most two of these."); } /* Sort out top, bottom, and height specifications */ if (toprow == UNSPEC && bottomrow == UNSPEC && heightarg == UNSPEC) { *toprow_p = 0; *bottomrow_p = rows - 1; } if (toprow == UNSPEC && bottomrow == UNSPEC && heightarg != UNSPEC) { *toprow_p = 0; *bottomrow_p = 0 + heightarg - 1; } if (toprow == UNSPEC && bottomrow != UNSPEC && heightarg == UNSPEC) { *toprow_p = 0; *bottomrow_p = bottomrow; } if (toprow == UNSPEC && bottomrow != UNSPEC && heightarg != UNSPEC) { *toprow_p = bottomrow - heightarg + 1; *bottomrow_p = bottomrow; } if (toprow != UNSPEC && bottomrow == UNSPEC && heightarg == UNSPEC) { *toprow_p = toprow; *bottomrow_p = rows - 1; } if (toprow != UNSPEC && bottomrow == UNSPEC && heightarg != UNSPEC) { *toprow_p = toprow; *bottomrow_p = toprow + heightarg - 1; } if (toprow != UNSPEC && bottomrow != UNSPEC && heightarg == UNSPEC) { *toprow_p = toprow; *bottomrow_p = bottomrow; } if (toprow != UNSPEC && bottomrow != UNSPEC && heightarg != UNSPEC) { pm_error("You may not specify top, bottom, and height.\n" "Choose at most two of these."); } /* Reject coordinates off the edge */ if (*leftcol_p < 0) pm_error("You have specified a left edge (%d) that is beyond\n" "the left edge of the image (0)", *leftcol_p); if (*rightcol_p > cols-1) pm_error("You have specified a right edge (%d) that is beyond\n" "the right edge of the image (%d)", *rightcol_p, cols-1); if (*rightcol_p < 0) pm_error("You have specified a right edge (%d) that is beyond\n" "the left edge of the image (0)", *rightcol_p); if (*rightcol_p > cols-1) pm_error("You have specified a right edge (%d) that is beyond\n" "the right edge of the image (%d)", *rightcol_p, cols-1); if (*leftcol_p > *rightcol_p) pm_error("You have specified a left edge (%d) that is to the right\n" "of the right edge you specified (%d)", *leftcol_p, *rightcol_p); if (*toprow_p < 0) pm_error("You have specified a top edge (%d) that is above the top " "edge of the image (0)", *toprow_p); if (*bottomrow_p > rows-1) pm_error("You have specified a bottom edge (%d) that is below the\n" "bottom edge of the image (%d)", *bottomrow_p, rows-1); if (*bottomrow_p < 0) pm_error("You have specified a bottom edge (%d) that is above the\n" "top edge of the image (0)", *bottomrow_p); if (*bottomrow_p > rows-1) pm_error("You have specified a bottom edge (%d) that is below the\n" "bottom edge of the image (%d)", *bottomrow_p, rows-1); if (*toprow_p > *bottomrow_p) pm_error("You have specified a top edge (%d) that is below\n" "the bottom edge you specified (%d)", *toprow_p, *bottomrow_p); } int main(int argc, char *argv[]) { FILE* ifp; xel* xelrow; xelval maxval; int rows, cols, format, row; int leftcol, rightcol, toprow, bottomrow; struct cmdline_info cmdline; pnm_init( &argc, argv ); parse_command_line(argc, argv, &cmdline); ifp = pm_openr(cmdline.input_filespec); pnm_readpnminit(ifp, &cols, &rows, &maxval, &format); xelrow = pnm_allocrow(cols); compute_cut_bounds(cols, rows, cmdline.left, cmdline.right, cmdline.top, cmdline.bottom, cmdline.width, cmdline.height, &leftcol, &rightcol, &toprow, &bottomrow); if (cmdline.verbose) { pm_message("Image goes from Row 0, Column 0 through Row %d, Column %d", rows-1, cols-1); pm_message("Cutting from Row %d, Column %d through Row %d Column %d", toprow, leftcol, bottomrow, rightcol); } pnm_writepnminit(stdout, rightcol-leftcol+1, bottomrow-toprow+1, maxval, format, 0 ); for (row = 0; row < rows; row++) { pnm_readpnmrow(ifp, xelrow, cols, maxval, format); if (row >= toprow && row <= bottomrow) pnm_writepnmrow(stdout, &(xelrow[leftcol]), rightcol-leftcol+1, maxval, format, 0); } /* Note that we may be tempted just to quit after reaching the bottom of the extracted image, but that would cause a broken pipe problem for the process that's feeding us the image. */ pnm_freerow(xelrow); pm_close(ifp); pm_close(stdout); exit( 0 ); }