mg_jpg.c File Reference

Implementation of JPG decoder - according to the specification. More...

#include "decoder.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <setjmp.h>
#include <jpeglib.h>
#include <jerror.h>
#include "glue_memory.h"
#include "mg_ctxt.h"
#include "osd_utils.h"
#include "glue_assert.h"

Data Structures
struct	smyfile
struct	my_error_mgr
struct	my_source_mgr

Macros
#define	INPUT_BUF_SIZE   4096 /* choose an efficiently fread'able size */
#define	GetColourIndex(r, g, b, a)   OSD_FindNearestColourIndex((a << 24) | (r << 16) | (g << 8) | b )

Typedefs
typedef struct smyfile	myfile_t
typedef struct my_error_mgr *	my_error_ptr
typedef my_source_mgr *	my_src_ptr

Functions
	init_source (j_decompress_ptr cinfo)
	fill_input_buffer (j_decompress_ptr cinfo)
	skip_input_data (j_decompress_ptr cinfo, long num_bytes)
	term_source (j_decompress_ptr cinfo)
	jobs_stdio_src (j_decompress_ptr cinfo, myfile_t *infile)
S_IMAGE *	DEC_DecodeJpg (U8BIT *data, U32BIT len)
	Allocate memory for JPG and decode bitmap. More...
void	DEC_FreeJpg (S_IMAGE *data)
	Free memory allocated for JPEG bitmap. More...

Detailed Description

Implementation of JPG decoder - according to the specification.

Date

18-07-2008

Author

Adam Sturtridge

Macro Definition Documentation

#define GetColourIndex	(		r,
			g,
			b,
			a
	)		OSD_FindNearestColourIndex((a << 24) | (r << 16) | (g << 8) | b )

#define INPUT_BUF_SIZE   4096 /* choose an efficiently fread'able size */

Typedef Documentation

typedef struct my_error_mgr* my_error_ptr

typedef my_source_mgr* my_src_ptr

typedef struct smyfile myfile_t

Function Documentation

S_IMAGE* DEC_DecodeJpg	(	U8BIT *	data,
		U32BIT	len
	)

Allocate memory for JPG and decode bitmap.

Allocate memory for JPEG and decode bitmap To free "S_IMAGE" memory, DEC_FreeJpg will be called.

Parameters

void	* data JPG data. int len Length of data for JPG.

Returns

void * The decoded bitmap.

Warning

Bug:

void DEC_FreeJpg

(

S_IMAGE *

image

)

Free memory allocated for JPEG bitmap.

Parameters

data

JPG image

Returns

void

fill_input_buffer

(

j_decompress_ptr

cinfo

)

init_source

(

j_decompress_ptr

cinfo

)

jobs_stdio_src	(	j_decompress_ptr	cinfo,
		myfile_t *	infile
	)

skip_input_data	(	j_decompress_ptr	cinfo,
		long	num_bytes
	)

term_source

(

j_decompress_ptr

cinfo

)