mr_pnm_io.c File Reference

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include "mr_error.h"
#include "mr_pnm_io.h"

Defines
#define	PNM_MIN_MAGIC   '1'
#define	PNM_MAX_MAGIC   '6'
#define	PNM_ONE_BYTE_DEPTH   256
#define	PNM_MAX_COLOR_VALUE   65536
#define	PNM_MAX_LINE_WIDTH   70
#define	PNM_COLOR_SIZE   3
#define	PNM_MONO_SIZE   1
#define	ONE_BYTE   8
#define	PBM_BLACK   1
#define	PBM_WHITE   0
#define	PNM_GET_NITEMS(pnmtype)   (pnmtype == MR_PBM_RAW || pnmtype == MR_PBM_ASCII ? 2 : 3)
#define	PNM_IS_COLOR(pnmtype)   (pnmtype == MR_PPM_ASCII || pnmtype == MR_PPM_RAW)
#define	PNM_IS_ASCII(pnmtype)   (pnmtype < MR_PBM_RAW)
#define	PNM_IS_DEPTH1(maxval)   (maxval < PNM_ONE_BYTE_DEPTH)
#define	PNM_IS_DEPTH2(maxval)   (maxval >= PNM_ONE_BYTE_DEPTH)
#define	BIT8   0x01
#define	BIT7   0x02
#define	BIT6   0x04
#define	BIT5   0x08
#define	BIT4   0x10
#define	BIT3   0x20
#define	BIT2   0x40
#define	BIT1   0x80
#define	IS_BIT_ON(octet, b)   ((octet) & b)
#define	SET_BIT_ON(octet, b)   ((octet) | b)
#define	SET_BIT_OFF(octet, b)   ((octet) & b)
Functions
static int	pnm_alloc_data (MrPNMImage *image)
static void	pbm_expand_n_bits (unsigned char *dst, unsigned short int *src, unsigned int n)
static void	pbm_group_n_bytes (unsigned char *dst, unsigned short int *src, unsigned int n)
static int	pnm_magic_number_fread (FILE *f, MrPNMImage *image)
static int	pnm_magic_number_fwrite (FILE *f, MrPNMImage *image)
static int	pnm_items_fread (FILE *f, MrPNMImage *image)
static int	pnm_items_fwrite (FILE *f, MrPNMImage *image)
static int	pnm_ascii_one_line_fread (FILE *f, MrPNMImage *image, unsigned char *p)
static int	pnm_ascii_one_line_fwrite (FILE *f, MrPNMImage *image, unsigned char *p)
static int	pnm_data_fread (FILE *f, MrPNMImage *image)
static int	pnm_data_fwrite (FILE *f, MrPNMImage *image)
static int	pnm_fread (FILE *f, MrPNMImage *image)
static int	pnm_fwrite (FILE *f, MrPNMImage *image, const char *sign)
MrPNMImage *	mr_pnm_new ()
void	mr_pnm_free (MrPNMImage *img)
MrPNMImage *	mr_pnm_new_from_file (const char *filename)
int	mr_pnm_write_to_file (MrPNMImage *image, const char *filename)
void	mr_pnm_draw_horizontal_line (MrPNMImage *pnm_img, unsigned int x, unsigned int y, unsigned int len, unsigned char r, unsigned char g, unsigned char b)
	Draw a horizontal line on a PNM image.
void	mr_pnm_draw_rectangle (MrPNMImage *pnm_img, unsigned int x, unsigned int y, unsigned int w, unsigned int h, unsigned char r, unsigned char g, unsigned char b, short int fill)
	Draw a rectangle on a PNM image.
Variables
int	mr_pnm_errno = MR_PNM_ELIBC

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Define Documentation

#define BIT1   0x80

#define BIT2   0x40

#define BIT3   0x20

#define BIT4   0x10

#define BIT5   0x08

#define BIT6   0x04

#define BIT7   0x02

#define BIT8   0x01

#define IS_BIT_ON (  octet, b   )     ((octet) & b)

#define ONE_BYTE   8

#define PBM_BLACK   1

#define PBM_WHITE   0

#define PNM_COLOR_SIZE   3

#define PNM_GET_NITEMS (  pnmtype   )     (pnmtype == MR_PBM_RAW || pnmtype == MR_PBM_ASCII ? 2 : 3)

#define PNM_IS_ASCII (  pnmtype   )     (pnmtype < MR_PBM_RAW)

#define PNM_IS_COLOR (  pnmtype   )     (pnmtype == MR_PPM_ASCII || pnmtype == MR_PPM_RAW)

#define PNM_IS_DEPTH1 (  maxval   )     (maxval < PNM_ONE_BYTE_DEPTH)

#define PNM_IS_DEPTH2 (  maxval   )     (maxval >= PNM_ONE_BYTE_DEPTH)

#define PNM_MAX_COLOR_VALUE   65536

#define PNM_MAX_LINE_WIDTH   70

#define PNM_MAX_MAGIC   '6'

#define PNM_MIN_MAGIC   '1'

#define PNM_MONO_SIZE   1

#define PNM_ONE_BYTE_DEPTH   256

#define SET_BIT_OFF (  octet, b   )     ((octet) & b)

#define SET_BIT_ON (  octet, b   )     ((octet) | b)

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Function Documentation

void mr_pnm_draw_horizontal_line (  MrPNMImage *  image, unsigned int  x, unsigned int  y, unsigned int  len, unsigned char  r, unsigned char  g, unsigned char  b )

Draw a horizontal line on a PNM image. Parameters: image  the image where draw x  x coordinate of the left extremity y  y coordinate of the left extremity len  the length of the line r  value for the red channel g  value for the green channel b  value for the blue channel

void mr_pnm_draw_rectangle (  MrPNMImage *  image, unsigned int  x, unsigned int  y, unsigned int  w, unsigned int  h, unsigned char  r, unsigned char  g, unsigned char  b, short int  fill )

Draw a rectangle on a PNM image. Parameters: image  the image where draw x  x coordinate of the upper left corner of the rectangle y  y coordinate of the upper left corner of the rectangle w  width of the rectangle h  height of the rectangle r  value for the red channel g  value for the green channel b  value for the blue channel fill  1 : the rectangle is filled

void mr_pnm_free (  MrPNMImage *  img  )

Destroy a pnm image structure. !!! also destroy the pixels data !!! !!! you can call it with NULL parameter !!!

MrPNMImage* mr_pnm_new (   )

Create a pnm image structure with fields sets to 0.

MrPNMImage* mr_pnm_new_from_file (  const char *  filename  )

Get a PNM type image from the specified file. Returns: The PNM image structure or NULL in case of errors.

int mr_pnm_write_to_file (  MrPNMImage *  image, const char *  filename )

Write a PNM image to a file. Returns: 0 if successfull -1 in case of errors.

static void pbm_expand_n_bits (  unsigned char *  dst, unsigned short int *  src, unsigned int  n )  [static]

static void pbm_group_n_bytes (  unsigned char *  dst, unsigned short int *  src, unsigned int  n )  [static]

static int pnm_alloc_data (  MrPNMImage *  image  )  [static]

static int pnm_ascii_one_line_fread (  FILE *  f, MrPNMImage *  image, unsigned char *  p )  [static]

static int pnm_ascii_one_line_fwrite (  FILE *  f, MrPNMImage *  image, unsigned char *  p )  [static]

static int pnm_data_fread (  FILE *  f, MrPNMImage *  image )  [static]

static int pnm_data_fwrite (  FILE *  f, MrPNMImage *  image )  [static]

static int pnm_fread (  FILE *  f, MrPNMImage *  image )  [static]

static int pnm_fwrite (  FILE *  f, MrPNMImage *  image, const char *  sign )  [static]

static int pnm_items_fread (  FILE *  f, MrPNMImage *  image )  [static]

static int pnm_items_fwrite (  FILE *  f, MrPNMImage *  image )  [static]

static int pnm_magic_number_fread (  FILE *  f, MrPNMImage *  image )  [static]

static int pnm_magic_number_fwrite (  FILE *  f, MrPNMImage *  image )  [static]

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Variable Documentation

int mr_pnm_errno = MR_PNM_ELIBC

Integer to indicates what went wrong (i.e. errno). Its value is significant only when the call returned an error (usually -1).

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