preview.c File Reference

preview image More...

#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <stdarg.h>
#include <glib.h>
#include <math.h>
#include "preview.h"
#include "ccu.h"
#include <gsl/gsl_statistics.h>
#include <gsl/gsl_sort.h>

Functions
void	init_imstat ()
	initializes the image statisics system
void	preview_set_max_dimensions (int x, int y)
	sets the maximum sizes of the preview (online display)
void	preview_set_enable (int in)
	sets the preview to enabled/disbaled
void	preview_readout_starts (int ccu_width, int ccu_height)
	called by the aquistion system when the readout starts
void	preview_fill_buffer (unsigned char *data, int size)
	fills previewbuf with data, without drawing anything
void	preview_send_data ()
	checks whether new data is available for sending to the (G)UI and sends new data in this case.
void	preview_readout_finished ()
	This function is called when the readout has finished.
Variables
unsigned int *	previewbuf = NULL
volatile unsigned long int	preview_words_sent = 0
volatile unsigned long int	preview_words_ready = 0
sem_t	preview_sem
double *	data
volatile int	preview_width = 256
volatile int	preview_height = 256
volatile int	preview_max_width = 400
volatile int	preview_max_height = 400
volatile int	preview_enable = 1
image_statistics_struct	image_statistics
sem_t	imstat_sem
unsigned long	preview_x
unsigned long	preview_y

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Detailed Description

preview image

Copyright (C) 2001-2003 Dirk Huenniger (dhun@astro.uni-bonn.de)

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.

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Function Documentation

void init_imstat (   )

initializes the image statisics system Returns: void This function initializes the image statisics system. It has to be during system initialization

void preview_fill_buffer (  unsigned char *  data, int  size )

fills previewbuf with data, without drawing anything Parameters: data  a pointer to the data to be filled into previewbuf size  the number of bytes to be read from data Returns: void This function fills previewbuf without changing or redrawing rgbbuffer. It is called by the readout thread and receives the same data as routine writing the fits file

void preview_readout_finished (   )

This function is called when the readout has finished. Returns: void This function is called when the readout has finished. it sends the rest of the preview to the (G)UI. Furthermore it waits until the image statistics of the image have been calculated and resets the image statistics after wards (I don't understand why).

void preview_readout_starts (  int  ccu_width, int  ccu_height )

called by the aquistion system when the readout starts Parameters: ccu_width  the width of the image acquired ccu_height  the height of the image acquired Returns: void This function is called by the aquistion system when the readout starts. It resets the preview buffer and prepares the preview system. Futhermore it resets the image statistics system.

void preview_send_data (   )

checks whether new data is available for sending to the (G)UI and sends new data in this case. Returns: void This function checks whether new data is available for sending to the clients and sends new data in this case. This function is called by a timer. The sending to the (G)UI is done by calling ui_preview_data.

void preview_set_enable (  int  in  )

sets the preview to enabled/disbaled Parameters: in  the enable mode. 1 means enabled Returns: void This function sets the maximum sizes of the preview.

void preview_set_max_dimensions (  int  x, int  y )

sets the maximum sizes of the preview (online display) Parameters: x  the maximum size in x direction y  the maximum size in y direction Returns: void This function sets the maximum sizes of the preview.

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Variable Documentation

double* data

a float buffer to calculate some image statistics

struct image_statistics_struct image_statistics

The current image st

sem_t imstat_sem

a semaphore protecting image_statistics struct of the image staitics system (would be better to move the image statistics system to an other file)

volatile int preview_enable = 1

1 if the Preview Data shall be sent to the User interace

volatile int preview_height = 256

The actual height of the preview image

volatile int preview_max_height = 400

The maximum height of the preview image

volatile int preview_max_width = 400

The maximum width of the preview image

sem_t preview_sem

a semaphore protecting preview_words_sent preview_words_ready and previewbuf

volatile int preview_width = 256

The actual width of the preview image

volatile unsigned long int preview_words_ready = 0

the number of bytes of bytes that have are ready to be send to the preview

volatile unsigned long int preview_words_sent = 0

the number of bytes of the preview image that have allready been transferred to the gui

unsigned long preview_x

The current postition in the dataflow received from the CCD Controller, in the system of the frame as aquired by the CCD Controller (not in the system (smaller) preview image)

unsigned long preview_y

The current postition in the dataflow received from the CCD Controller, in the system of the frame as aquired by the CCD Controller (not in the system (smaller) preview image)

unsigned int* previewbuf = NULL

a buffer to hold preview image (16 bit grey)

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