jas_image.h

DIGITAL IMAGERY is pervasive in our world today. Consequently, standards for the efficient represen

/* Image format-dependent operations. */

typedef struct {

	jas_image_t *(*decode)(jas_stream_t *in, char *opts);
	/* Decode image data from a stream. */

	int (*encode)(jas_image_t *image, jas_stream_t *out, char *opts);
	/* Encode image data to a stream. */

	int (*validate)(jas_stream_t *in);
	/* Determine if stream data is in a particular format. */

} jas_image_fmtops_t;

/* Image format information. */

typedef struct {

	int id;
	/* The ID for this format. */

	char *name;
	/* The name by which this format is identified. */

	char *ext;
	/* The file name extension associated with this format. */

	char *desc;
	/* A brief description of the format. */

	jas_image_fmtops_t ops;
	/* The operations for this format. */

} jas_image_fmtinfo_t;

/******************************************************************************\
* Image operations.
\******************************************************************************/

/* Create an image. */
jas_image_t *jas_image_create(int numcmpts,
  jas_image_cmptparm_t *cmptparms, jas_clrspc_t clrspc);

/* Create an "empty" image. */
jas_image_t *jas_image_create0(void);

/* Clone an image. */
jas_image_t *jas_image_copy(jas_image_t *image);

/* Deallocate any resources associated with an image. */
void jas_image_destroy(jas_image_t *image);

/* Get the width of the image in units of the image reference grid. */
#define jas_image_width(image) \
	((image)->brx_ - (image)->tlx_)

/* Get the height of the image in units of the image reference grid. */
#define	jas_image_height(image) \
	((image)->bry_ - (image)->tly_)

/* Get the x-coordinate of the top-left corner of the image bounding box
  on the reference grid. */
#define jas_image_tlx(image) \
	((image)->tlx_)

/* Get the y-coordinate of the top-left corner of the image bounding box
  on the reference grid. */
#define jas_image_tly(image) \
	((image)->tly_)

/* Get the x-coordinate of the bottom-right corner of the image bounding box
  on the reference grid (plus one). */
#define jas_image_brx(image) \
	((image)->brx_)

/* Get the y-coordinate of the bottom-right corner of the image bounding box
  on the reference grid (plus one). */
#define jas_image_bry(image) \
	((image)->bry_)

/* Get the number of image components. */
#define	jas_image_numcmpts(image) \
	((image)->numcmpts_)

/* Get the color model used by the image. */
#define	jas_image_clrspc(image) \
	((image)->clrspc_)

/* Set the color model for an image. */
#define jas_image_setclrspc(image, clrspc) \
	((image)->clrspc_ = (clrspc))

#define jas_image_cmpttype(image, cmptno) \
	((image)->cmpts_[(cmptno)]->type_)
#define jas_image_setcmpttype(image, cmptno, type) \
	((image)->cmpts_[(cmptno)]->type_ = (type))

/* Get the width of a component. */
#define	jas_image_cmptwidth(image, cmptno) \
	((image)->cmpts_[cmptno]->width_)

/* Get the height of a component. */
#define	jas_image_cmptheight(image, cmptno) \
	((image)->cmpts_[cmptno]->height_)

/* Get the signedness of the sample data for a component. */
#define	jas_image_cmptsgnd(image, cmptno) \
	((image)->cmpts_[cmptno]->sgnd_)

/* Get the precision of the sample data for a component. */
#define	jas_image_cmptprec(image, cmptno) \
	((image)->cmpts_[cmptno]->prec_)

/* Get the horizontal subsampling factor for a component. */
#define	jas_image_cmpthstep(image, cmptno) \
	((image)->cmpts_[cmptno]->hstep_)

/* Get the vertical subsampling factor for a component. */
#define	jas_image_cmptvstep(image, cmptno) \
	((image)->cmpts_[cmptno]->vstep_)

/* Get the x-coordinate of the top-left corner of a component. */
#define	jas_image_cmpttlx(image, cmptno) \
	((image)->cmpts_[cmptno]->tlx_)

/* Get the y-coordinate of the top-left corner of a component. */
#define	jas_image_cmpttly(image, cmptno) \
	((image)->cmpts_[cmptno]->tly_)

/* Get the x-coordinate of the bottom-right corner of a component
  (plus "one"). */
#define	jas_image_cmptbrx(image, cmptno) \
	((image)->cmpts_[cmptno]->tlx_ + (image)->cmpts_[cmptno]->width_ * \
	  (image)->cmpts_[cmptno]->hstep_)

/* Get the y-coordinate of the bottom-right corner of a component
  (plus "one"). */
#define	jas_image_cmptbry(image, cmptno) \
	((image)->cmpts_[cmptno]->tly_ + (image)->cmpts_[cmptno]->height_ * \
	  (image)->cmpts_[cmptno]->vstep_)

/* Get the raw size of an image (i.e., the nominal size of the image without
  any compression. */
uint_fast32_t jas_image_rawsize(jas_image_t *image);

/* Create an image from a stream in some specified format. */
jas_image_t *jas_image_decode(jas_stream_t *in, int fmt, char *optstr);

/* Write an image to a stream in a specified format. */
int jas_image_encode(jas_image_t *image, jas_stream_t *out, int fmt,
  char *optstr);

/* Read a rectangular region of an image component. */
/* The position and size of the rectangular region to be read is specified
relative to the component's coordinate system. */
int jas_image_readcmpt(jas_image_t *image, int cmptno,
  jas_image_coord_t x, jas_image_coord_t y, jas_image_coord_t width, jas_image_coord_t height,
  jas_matrix_t *data);

/* Write a rectangular region of an image component. */
int jas_image_writecmpt(jas_image_t *image, int cmptno,
  jas_image_coord_t x, jas_image_coord_t y, jas_image_coord_t width, jas_image_coord_t height,
  jas_matrix_t *data);

/* Delete a component from an image. */
void jas_image_delcmpt(jas_image_t *image, int cmptno);

/* Add a component to an image. */
int jas_image_addcmpt(jas_image_t *image, int cmptno,
  jas_image_cmptparm_t *cmptparm);

/* Copy a component from one image to another. */
int jas_image_copycmpt(jas_image_t *dstimage, int dstcmptno,
  jas_image_t *srcimage, int srccmptno);

#define	JAS_IMAGE_CDT_GETSGND(dtype) (((dtype) >> 7) & 1)
#define	JAS_IMAGE_CDT_SETSGND(dtype) (((dtype) & 1) << 7)
#define	JAS_IMAGE_CDT_GETPREC(dtype) ((dtype) & 0x7f)
#define	JAS_IMAGE_CDT_SETPREC(dtype) ((dtype) & 0x7f)

#define	jas_image_cmptdtype(image, cmptno) \
	(JAS_IMAGE_CDT_SETSGND((image)->cmpts_[cmptno]->sgnd_) | JAS_IMAGE_CDT_SETPREC((image)->cmpts_[cmptno]->prec_))

int jas_image_depalettize(jas_image_t *image, int cmptno, int numlutents,
  int_fast32_t *lutents, int dtype, int newcmptno);

int jas_image_readcmptsample(jas_image_t *image, int cmptno, int x, int y);
void jas_image_writecmptsample(jas_image_t *image, int cmptno, int x, int y,
  int_fast32_t v);

int jas_image_getcmptbytype(jas_image_t *image, int ctype);

/******************************************************************************\
* Image format-related operations.
\******************************************************************************/

/* Clear the table of image formats. */
void jas_image_clearfmts(void);

/* Add entry to table of image formats. */
int jas_image_addfmt(int id, char *name, char *ext, char *desc,
  jas_image_fmtops_t *ops);

/* Get the ID for the image format with the specified name. */
int jas_image_strtofmt(char *s);

/* Get the name of the image format with the specified ID. */
char *jas_image_fmttostr(int fmt);

/* Lookup image format information by the format ID. */
jas_image_fmtinfo_t *jas_image_lookupfmtbyid(int id);

/* Lookup image format information by the format name. */
jas_image_fmtinfo_t *jas_image_lookupfmtbyname(const char *name);

/* Guess the format of an image file based on its name. */
int jas_image_fmtfromname(char *filename);

/* Get the format of image data in a stream. */
int jas_image_getfmt(jas_stream_t *in);


#define	jas_image_cmprof(image)	((image)->cmprof_)
int jas_image_ishomosamp(jas_image_t *image);
int jas_image_sampcmpt(jas_image_t *image, int cmptno, int newcmptno,
  jas_image_coord_t ho, jas_image_coord_t vo, jas_image_coord_t hs,
  jas_image_coord_t vs, int sgnd, int prec);
int jas_image_writecmpt2(jas_image_t *image, int cmptno, jas_image_coord_t x,
  jas_image_coord_t y, jas_image_coord_t width, jas_image_coord_t height,
  long *buf);
int jas_image_readcmpt2(jas_image_t *image, int cmptno, jas_image_coord_t x,
  jas_image_coord_t y, jas_image_coord_t width, jas_image_coord_t height,
  long *buf);

#define	jas_image_setcmprof(image, cmprof) ((image)->cmprof_ = cmprof)
jas_image_t *jas_image_chclrspc(jas_image_t *image, jas_cmprof_t *outprof,
  int intent);
void jas_image_dump(jas_image_t *image, FILE *out);

/******************************************************************************\
* Image format-dependent operations.
\******************************************************************************/

#if !defined(EXCLUDE_JPG_SUPPORT)
/* Format-dependent operations for JPG support. */
jas_image_t *jpg_decode(jas_stream_t *in, char *optstr);
int jpg_encode(jas_image_t *image, jas_stream_t *out, char *optstr);
int jpg_validate(jas_stream_t *in);
#endif

#if !defined(EXCLUDE_MIF_SUPPORT)
/* Format-dependent operations for MIF support. */
jas_image_t *mif_decode(jas_stream_t *in, char *optstr);
int mif_encode(jas_image_t *image, jas_stream_t *out, char *optstr);
int mif_validate(jas_stream_t *in);
#endif

#if !defined(EXCLUDE_PNM_SUPPORT)
/* Format-dependent operations for PNM support. */
jas_image_t *pnm_decode(jas_stream_t *in, char *optstr);
int pnm_encode(jas_image_t *image, jas_stream_t *out, char *optstr);
int pnm_validate(jas_stream_t *in);
#endif

#if !defined(EXCLUDE_RAS_SUPPORT)
/* Format-dependent operations for Sun Rasterfile support. */
jas_image_t *ras_decode(jas_stream_t *in, char *optstr);
int ras_encode(jas_image_t *image, jas_stream_t *out, char *optstr);
int ras_validate(jas_stream_t *in);
#endif

#if !defined(EXCLUDE_BMP_SUPPORT)
/* Format-dependent operations for BMP support. */
jas_image_t *bmp_decode(jas_stream_t *in, char *optstr);
int bmp_encode(jas_image_t *image, jas_stream_t *out, char *optstr);
int bmp_validate(jas_stream_t *in);
#endif

#if !defined(EXCLUDE_JP2_SUPPORT)
/* Format-dependent operations for JP2 support. */
jas_image_t *jp2_decode(jas_stream_t *in, char *optstr);
int jp2_encode(jas_image_t *image, jas_stream_t *out, char *optstr);
int jp2_validate(jas_stream_t *in);
#endif

#if !defined(EXCLUDE_JPC_SUPPORT)
/* Format-dependent operations for JPEG-2000 code stream support. */
jas_image_t *jpc_decode(jas_stream_t *in, char *optstr);
int jpc_encode(jas_image_t *image, jas_stream_t *out, char *optstr);
int jpc_validate(jas_stream_t *in);
#endif

#if !defined(EXCLUDE_PGX_SUPPORT)
/* Format-dependent operations for PGX support. */
jas_image_t *pgx_decode(jas_stream_t *in, char *optstr);
int pgx_encode(jas_image_t *image, jas_stream_t *out, char *optstr);
int pgx_validate(jas_stream_t *in);
#endif

#ifdef __cplusplus
}
#endif

#endif