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SwRI can revise these Terms at any time * without notice by updating this posting. * * Trademarks * * The SwRI logo is a trademark of SwRI in the United States and other countries. * */ #ident "@(#) next_time.c 1.16 05/08/19 SwRI" #include "libtrec_idfs.h" /******************************************************************************* * * * IR_NEXT_PIXEL_TIME SUBROUTINE * * * * DESCRIPTION * * This routine is called in order to determine the time of a pixel * * located x-many pixels away from current location. The pixel location can * * be either be forward from the current location (time advances forward) or * * backward from the current location (time went backwards). * * * * INPUT VARIABLES * * SDDAS_LONG *pix_sec, start time, in terms of the base time and * * *pix_nsec resolution, for the buffer's start pixel * * SDDAS_LONG num_pixels number of pixels to add/subtract from the * * current time * * SDDAS_CHAR inc_time flag indicating if time is increasing or * * decreasing * * * * USAGE * * ir_next_pixel_time (num_pixels, &pix_sec, &pix_nsec, inc_time) * * * * NECESSARY SUBPROGRAMS * * None * * * * EXTERNAL VARIABLES * * struct general_info structure holding information concerning * * ginfo the experiment that is being processed * * * * INTERNAL VARIABLES * * struct experiment_info a pointer to the structure that holds * * *ex specific experiment information * * register SDDAS_LONG i looping variable * * reg long res_sec, res_nano time resolution for a single pixel location * * * * SUBSYSTEM * * Display Level * * * ******************************************************************************/ void ir_next_pixel_time (SDDAS_LONG num_pixels, SDDAS_LONG *pix_sec, SDDAS_LONG *pix_nsec, SDDAS_CHAR inc_time) { extern struct general_info ginfo; struct experiment_info *ex; register SDDAS_LONG i, res_sec, res_nano; /*************************************************************************/ /* Initialize variables. */ /*************************************************************************/ ex = ginfo.expt; res_sec = ex->time_values.res_sec; res_nano = ex->time_values.res_nano; if (inc_time) for (i = 0; i < num_pixels; ++i) { /*******************************************************************/ /* Determine time of the pixel & adjust nanoseconds if necessary. */ /*******************************************************************/ *pix_sec += res_sec; *pix_nsec += res_nano; if (*pix_nsec >= 1000000000) { ++*pix_sec; *pix_nsec -= 1000000000; } } else for (i = 0; i < num_pixels; ++i) { /*******************************************************************/ /* Determine time of the pixel & adjust nanoseconds if necessary. */ /*******************************************************************/ *pix_sec -= res_sec; *pix_nsec -= res_nano; if (*pix_nsec < 0) { --*pix_sec; *pix_nsec += 1000000000; } } }