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F.16. CODE LISTINGS FOR CHAPTER 16
709
argv[4]);
exit(4);
}
if((processed_pattern_file =
fopen(argv[4], "wt")) == NULL){
printf(
"\ncstereo: Error opening temp file %s\n",
argv[5]);
exit(5);
}
/******************************************
*
*
This is the major loop of the program.
*
It reads one line at a time from the
*
depth file, processes that one line,
*
and writes the resulting pattern to the
*
processed pattern file.
*
******************************************/
while(fgets(depth_line,
KONSTANT*width,
depth_file)){
fill_line(pattern, KONSTANT*width);
fill_line(processed_pattern, KONSTANT*width);
initialize_pattern(pattern,
&current_width,
&max_width,
s_length,
&index);
/*******************************************
*
*
Loop through the characters in the
*
depth_line. Call one of the three
*
processing routines based on the
*
relationship between the last character
*
and this character.
*
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710
APPENDIX F. SOURCE CODE LISTINGS
*******************************************/
last_character = depth_line[0];
pp_index = 0;
for(j=0; j<width; j++){
this_character = depth_line[j];
if(this_character == ’\n’)
this_character = last_character;
if(this_character > last_character)
shorten_pattern(
(this_character-last_character),
pattern, &index, &current_width,
width);
if(this_character < last_character)
s_lengthen_pattern(
(last_character-this_character),
pattern, &index, &current_width,
&width, &max_width, s_length);
/****************************************
*
*
Perform the no_change in every
*
pass. Do it after you have done
*
the shorten and lenghten pattern.
*
****************************************/
no_change(pattern, processed_pattern,
pp_index, current_width, &index);
pp_index++;
last_character = depth_line[j];
} /* ends loop over j */
pdest
= strchr(processed_pattern, ’\0’);
location = pdest - processed_pattern;
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F.16. CODE LISTINGS FOR CHAPTER 16
711
processed_pattern[location] = ’\n’;
fputs(processed_pattern,
processed_pattern_file);
special_substitution(processed_pattern,
special_text, width);
fputs(processed_pattern, stereo_file);
}
/* ends the major loop */
fclose(depth_file);
fclose(processed_pattern_file);
fclose(stereo_file);
free(pattern);
free(depth_line);
free(processed_pattern);
return(111);
} /* ends main
*/
/***********************************************
*
*
shorten_pattern(...
*
*
This funtion shortens the pattern by
*
deleting an element from it. For example,
*
if the input pattern is abcdefg,
*
the output pattern could be abcfg.
*
***********************************************/
void shorten_pattern(size, pattern, index,
current_width, width)
char *pattern;
int size, *index, *current_width, width;
{
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712
APPENDIX F. SOURCE CODE LISTINGS
char *temp_pattern;
int i, new_index, new_width;
temp_pattern = malloc(KONSTANT*width);
for(i=0; i<width; i++)
temp_pattern[i] = pattern[i];
fill_line(pattern, width);
new_index = 0;
new_width = *current_width - size;
/*********************************************
*
*
Increase the index by the amount we want
*
to shorten the pattern.
Then copy the
*
temp_pattern back to the pattern skipping
*
over parts of the pattern by the amount
*
we want to shorten it.
*
*********************************************/
*index = (*index + size) % (*current_width);
for(new_index=0; new_index<new_width; new_index++){
pattern[new_index] = temp_pattern[*index];
*index = *index + 1;
if(*index >= *current_width)
*index = 0;
} /* ends loop over new_index */
*current_width
= new_width;
*index
= 0;
free(temp_pattern);
} /* ends shorten_pattern */
/***********************************************
*
*
initialize_pattern(...
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F.16. CODE LISTINGS FOR CHAPTER 16
713
*
*
This function creates an initial pattern
*
that is as wide as the pattern_width
*
parameter.
*
***********************************************/
void initialize_pattern(pattern, current_width,
max_width, pattern_width,
index)
char pattern[];
int *current_width,
*max_width,
*index,
pattern_width;
{
int i;
for(i=0; i<pattern_width; i++)
pattern[i] = i+PATTERN_START;
*index
= 0;
*current_width = pattern_width;
*max_width
= pattern_width;
} /* ends initialize_pattern */
/***********************************************
*
*
no_change(...
*
*
This function processes the pattern
*
and does not make any changes to it.
*
***********************************************/
void no_change(pattern, processed_pattern, pp_index,
current_width, index)
char *pattern, *processed_pattern;
int pp_index, current_width, *index;
{
processed_pattern[pp_index] =
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714
APPENDIX F. SOURCE CODE LISTINGS
pattern[*index];
*index = *index + 1;
if(*index >= current_width)
*index = 0;
}
/* ends no_change */
/***********************************************
*
*
fill_line(...
*
*
This function fills a character line
*
with NULL characters.
*
***********************************************/
void fill_line(line, length)
char *line;
int length;
{
int i;
for(i=0; i<length; i++)
line[i] = ’\0’;
} /* ends fill_line */
/***********************************************
*
*
s_lengthen_pattern(...
*
*
This funtion lengthens the pattern by
*
inserting an element(s) into it.
*
This is the special length pattern routine.
*
It inserts only from the original pattern
*
(the special-text).
*
***********************************************/
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F.16. CODE LISTINGS FOR CHAPTER 16
715
void s_lengthen_pattern(size, pattern, index,
current_width, width,
max_width, s_length)
char *pattern;
int size, *index, *current_width,
*width, *max_width, s_length;
{
char *temp_pattern;
int count, element, i, new_index, new_width;
temp_pattern = malloc(KONSTANT*(*width));
for(i=0; i<(*width); i++)
temp_pattern[i] = pattern[i];
/******************************************
*
*
element is the value of the current
*
element. new_index points to its
*
position in the special_text and moves
*
back to the left by size.
*
******************************************/
element
= pattern[*index] - PATTERN_START;
new_index = (element - size) % s_length;
/******************************************
*
*
Put a new pattern in the pattern array
*
starting back at the new_index.
*
******************************************/
for(i=0; i<size; i++){
pattern[i] = new_index + PATTERN_START;
new_index++;
if(new_index == s_length)
new_index = 0;
} /* ends loop over i */
new_width = size + *current_width;
for(i=size; i<new_width; i++){
716
APPENDIX F. SOURCE CODE LISTINGS
pattern[i] = temp_pattern[*index];
*index = *index + 1;
if(*index >= *current_width)
*index = 0;
} /* ends loop over i, count */
*current_width = new_width;
*index
= 0;
} /* ends s_lengthen_pattern */
/***********************************************
*
*
special_substitution(...
*
*
This function takes the processed_pattern
*
array and substitutes the special text
*
into it.
*
***********************************************/
void special_substitution(processed_pattern,
special_text, width)
char *processed_pattern, special_text[];
int width;
{
int i, place;
for(i=0; i<(KONSTANT*width); i++){
if(processed_pattern[i] != ’\n’
&&
processed_pattern[i] != ’\0’){
place = processed_pattern[i] - PATTERN_START;
processed_pattern[i] =
special_text[place];
} /* ends if */
} /* ends loop over i */
} /* ends special_substitution */
F.16. CODE LISTINGS FOR CHAPTER 16
717
/***********************************************
*
*
test_print_line(...
*
*
This is a debug routine that prints an
*
array of characters.
*
***********************************************/
void test_print_line(line, width)
char *line;
int width;
{
int i;
for(i=0; i<width; i++)
printf("%c", line[i]);
printf("\n");
} /* ends test_print_line */
Listing 16.3 - The scstereo Program
/***********************************************
*
* file spstereo.c
*
* Functions: This file contains
*
main
*
zero_line
*
initialize_pattern
*
s_lengthen_pattern
*
no_change
*
shorten_pattern
*
special_substitution
*
read_image_line
*
write_image_line
*
test_print_line
*
equate_headers
*
* Purpose:
*
This file contains a program that will
*
make pixel based colorfield stereograms.
718
APPENDIX F. SOURCE CODE LISTINGS
*
* External Calls:
*
imageio.c - create_image_file
*
read_image_array
*
write_image_array
*
get_image_size
*
allocate_image_array
*
free_image_array
*
* Modifications:
*
29 April 1995 - created
*
29 August 1998 - modified to work on
*
entire images at once.
*
24 September 1998 - modified to work with
*
all I O routines in imageio.c.
*
*************************************************/
#include "cips.h"
#define KONSTANT
2
#define PATTERN_START
0
#define PATTERN_END
255
#define ASCII_SIZE
256
#undef DEBUG_MODE
#define COMMAND_LINE_MODE
short
**depth_image,
**pattern,
**processed_pattern,
**special_pixels;
void zero_line();
void initialize_pattern();
void s_lengthen_pattern();
void no_change();
void shorten_pattern();
void special_substitution();
void read_image_line();
void write_image_line();
void equate_headers();
void test_print_line();
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