sub_arctic.output
Class ppm_to_code

java.lang.Object
  |
  +--sub_arctic.output.ppm_to_code

public class ppm_to_code

extends java.lang.Object

A small stand-alone program to do a translation from PPM format image files to code for statically initializing an in memory loaded_image object. The result of this program is code for five static declarations -- an integer for the width of the image, an integer for the height, array of integers for the RGB values, a static loaded_image, and an accessor function for the image. These entities are declared as _width, _height, _data, _ and (), where is the string supplied by the -name command line argument (or the default of "image").

Each element of the static array encodes the value for one pixel in the form 0xaarrggbb, where aa is the hex value for alpha (transparency) rr for red, etc. Currently all alpha values are set to ff (fully opaque).

The program can be invoked from the command line using the -name argument to control the declared names. Reads a PPM file from standard input, and produces the resulting declarations on standard output.

This program now handles both ASCII and Binary encoded PPM files.

Field Summary

protected static java.util.StringTokenizer	current_line A tokenizer attached to the string for the current line
protected static java.io.BufferedReader	input_file The input stream we are reading from (this will get wrapped around System.in).

Method Summary

protected static void	do_binary_data(int w, int h) Process binary coded data body.
static void	main(java.lang.String[] argv) Main program so we can be invoked from the command line.
protected static int	next_int(java.lang.String message) Get the next token from standard input and try to interpret it as a decimal integer.
protected static java.lang.String	next_token() Get the next white-space delimited token from the input file
protected static void	usage() Print a "usage" message and exit
protected static void	write_hex_color(long alpha, long r, long g, long b) Write a color out to standard input encoded in a 32 bit hex constant (we use longs here so everything will be unsigned.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

input_file

protected static java.io.BufferedReader input_file

The input stream we are reading from (this will get wrapped around System.in).

current_line

protected static java.util.StringTokenizer current_line

A tokenizer attached to the string for the current line

Method Detail

next_token

protected static java.lang.String next_token()

Get the next white-space delimited token from the input file

next_int

protected static int next_int(java.lang.String message)

Get the next token from standard input and try to interpret it as a decimal integer. If this fails we print the given message on System.err and exit.

Parameters:

String - message error message to print on System.err if we fail.

Returns:

int integer value of next token treated as a decimal integer.

write_hex_color

protected static void write_hex_color(long alpha,
                                      long r,
                                      long g,
                                      long b)

Write a color out to standard input encoded in a 32 bit hex constant (we use longs here so everything will be unsigned. The result will be in the form "0xaarrggbb".

Parameters:

long - alpha transparency value.

long - r red value.

long - g green value.

long - b blue value.

usage

protected static void usage()

Print a "usage" message and exit

main

public static void main(java.lang.String[] argv)

Main program so we can be invoked from the command line.

Parameters:

String - argv[] arguments passed from the command line.

do_binary_data

protected static void do_binary_data(int w,
                                     int h)

Process binary coded data body. We expect to see 3*w*h bytes of data each representing a color value. We write out initialization code based on this data.

Parameters:

int - w width of image.

int - h height of image.