Image Representation. More...

Classes
struct	jas_image_cmpt_t
	Image component class. More...

struct	jas_image_t
	Image class. More...

struct	jas_image_cmptparm_t
	Component parameters class. More...

struct	jas_image_fmtops_t
	Image format-dependent operations. More...

struct	jas_image_fmtinfo_t
	Image format information. More...

Macros
#define	JAS_IMAGE_MAXFMTS 32
	The maximum number of image data formats supported. More...

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

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

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

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

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

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

#define	jas_image_numcmpts(image) ((image)->numcmpts_)
	Get the number of image components. More...

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

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

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

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

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

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

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

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

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

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

#define	jas_image_cmptbrx(image, cmptno)
	Get the x-coordinate of the bottom-right corner of a component (plus "one"). More...

#define	jas_image_cmptbry(image, cmptno)
	Get the y-coordinate of the bottom-right corner of a component (plus "one"). More...

#define	jas_image_cmprof(image) ((image)->cmprof_)
	Get the color management profile of an image. More...

#define	jas_image_setcmprof(image, cmprof) ((image)->cmprof_ = cmprof)
	Set the color management profile for an image. More...

Typedefs
typedef int_fast32_t	jas_image_coord_t
	Image coordinate. More...

typedef int_fast16_t	jas_image_colorspc_t
	Color space (e.g., RGB, YCbCr). More...

typedef int_fast32_t	jas_image_cmpttype_t
	Component type (e.g., color, opacity). More...

typedef int_fast16_t	jas_image_smpltype_t
	Component sample data format (e.g., real/integer, signedness, precision). More...

Functions
JAS_EXPORT jas_image_t *	jas_image_create (unsigned numcmpts, const jas_image_cmptparm_t *cmptparms, jas_clrspc_t clrspc)
	Create an image. More...

JAS_EXPORT jas_image_t *	jas_image_create0 (void)
	Create an "empty" image. More...

JAS_EXPORT jas_image_t *	jas_image_copy (jas_image_t *image)
	Clone an image. More...

JAS_EXPORT void	jas_image_destroy (jas_image_t *image)
	Deallocate any resources associated with an image. More...

JAS_ATTRIBUTE_PURE JAS_EXPORT bool	jas_image_cmpt_domains_same (const jas_image_t *image)
	Test if all components are specified at the same positions in space. More...

JAS_ATTRIBUTE_PURE JAS_EXPORT uint_fast32_t	jas_image_rawsize (const jas_image_t *image)
	Get the raw size of an image (i.e., the nominal size of the image without any compression. More...

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

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

JAS_EXPORT int	jas_image_readcmpt (jas_image_t image, unsigned 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)
	Read a rectangular region of an image component. More...

JAS_EXPORT int	jas_image_writecmpt (jas_image_t image, unsigned cmptno, jas_image_coord_t x, jas_image_coord_t y, jas_image_coord_t width, jas_image_coord_t height, const jas_matrix_t data)
	Write a rectangular region of an image component. More...

JAS_EXPORT void	jas_image_delcmpt (jas_image_t *image, unsigned cmptno)
	Delete a component from an image. More...

JAS_EXPORT int	jas_image_addcmpt (jas_image_t image, int cmptno, const jas_image_cmptparm_t cmptparm)
	Add a component to an image. More...

JAS_EXPORT int	jas_image_copycmpt (jas_image_t dstimage, unsigned dstcmptno, jas_image_t srcimage, unsigned srccmptno)
	Copy a component from one image to another. More...

JAS_EXPORT int	jas_image_depalettize (jas_image_t image, unsigned cmptno, unsigned numlutents, const int_fast32_t lutents, unsigned dtype, unsigned newcmptno)
	Depalettize an image. More...

JAS_EXPORT int	jas_image_readcmptsample (jas_image_t *image, unsigned cmptno, unsigned x, unsigned y)
	Read a component sample for an image. More...

JAS_EXPORT void	jas_image_writecmptsample (jas_image_t *image, unsigned cmptno, unsigned x, unsigned y, int_fast32_t v)
	Write a component sample for an image. More...

JAS_ATTRIBUTE_PURE JAS_EXPORT int	jas_image_getcmptbytype (const jas_image_t *image, jas_image_cmpttype_t ctype)
	Get an image component by its type. More...

JAS_EXPORT void	jas_image_clearfmts (void)
	Clear the table of image formats. More...

const JAS_EXPORT jas_image_fmtinfo_t *	jas_image_getfmtbyind (int index)
	Get a image format entry by its table index. More...

JAS_EXPORT int	jas_image_getnumfmts (void)
	Get the number of image format table entries. More...

JAS_EXPORT int	jas_image_setfmtenable (int index, int enabled)
	Get the number of image format table entries. More...

JAS_EXPORT int	jas_image_addfmt (int id, const char name, const char ext, const char desc, const jas_image_fmtops_t ops)
	Add entry to table of image formats. More...

JAS_ATTRIBUTE_PURE JAS_EXPORT int	jas_image_strtofmt (const char *s)
	Get the ID for the image format with the specified name. More...

JAS_ATTRIBUTE_CONST const JAS_EXPORT char *	jas_image_fmttostr (int fmt)
	Get the name of the image format with the specified ID. More...

JAS_ATTRIBUTE_CONST const JAS_EXPORT jas_image_fmtinfo_t *	jas_image_lookupfmtbyid (int id)
	Lookup image format information by the format ID. More...

JAS_ATTRIBUTE_PURE const JAS_EXPORT jas_image_fmtinfo_t *	jas_image_lookupfmtbyname (const char *name)
	Lookup image format information by the format name. More...

JAS_ATTRIBUTE_PURE JAS_EXPORT int	jas_image_fmtfromname (const char *filename)
	Guess the format of an image file based on its name. More...

JAS_ATTRIBUTE_PURE JAS_EXPORT int	jas_image_getfmt (jas_stream_t *in)
	Get the format of image data in a stream. More...

JAS_ATTRIBUTE_PURE JAS_EXPORT int	jas_image_ishomosamp (const jas_image_t *image)
	Test if the sampling of the image is homogeneous. More...

JAS_EXPORT int	jas_image_sampcmpt (jas_image_t *image, unsigned cmptno, unsigned newcmptno, jas_image_coord_t ho, jas_image_coord_t vo, jas_image_coord_t hs, jas_image_coord_t vs, int sgnd, unsigned prec)
	??? More...

JAS_EXPORT int	jas_image_writecmpt2 (jas_image_t image, unsigned cmptno, jas_image_coord_t x, jas_image_coord_t y, jas_image_coord_t width, jas_image_coord_t height, const long buf)
	Write sample data in a component of an image. More...

JAS_EXPORT int	jas_image_readcmpt2 (jas_image_t image, unsigned cmptno, jas_image_coord_t x, jas_image_coord_t y, jas_image_coord_t width, jas_image_coord_t height, long buf)
	Read sample data in a component of an image. More...

JAS_EXPORT jas_image_t *	jas_image_chclrspc (jas_image_t image, const jas_cmprof_t outprof, jas_cmxform_intent_t intent)
	Change the color space for an image. More...

JAS_EXPORT int	jas_image_dump (jas_image_t image, FILE out)
	Dump the information for an image (for debugging). More...

Detailed Description

Image Representation.

General information can be found here.

Macro Definition Documentation

◆ jas_image_brx

#define jas_image_brx ( image ) ((image)->brx_)

Get the x-coordinate of the bottom-right corner of the image bounding box on the reference grid (plus one).

◆ jas_image_bry

#define jas_image_bry ( image ) ((image)->bry_)

Get the y-coordinate of the bottom-right corner of the image bounding box on the reference grid (plus one).

◆ jas_image_clrspc

#define jas_image_clrspc ( image ) ((image)->clrspc_)

Get the color model used by the image.

◆ jas_image_cmprof

#define jas_image_cmprof ( image ) ((image)->cmprof_)

Get the color management profile of an image.

◆ jas_image_cmptbrx

#define jas_image_cmptbrx	(	image,
		cmptno
	)

Value:

((image)->cmpts_[cmptno]->tlx_ + (image)->cmpts_[cmptno]->width_ * \

(image)->cmpts_[cmptno]->hstep_)

Get the x-coordinate of the bottom-right corner of a component (plus "one").

◆ jas_image_cmptbry

#define jas_image_cmptbry	(	image,
		cmptno
	)

Value:

((image)->cmpts_[cmptno]->tly_ + (image)->cmpts_[cmptno]->height_ * \

(image)->cmpts_[cmptno]->vstep_)

Get the y-coordinate of the bottom-right corner of a component (plus "one").

◆ jas_image_cmptheight

#define jas_image_cmptheight	(	image,
		cmptno
	)	((image)->cmpts_[cmptno]->height_)

Get the height of a component.

◆ jas_image_cmpthstep

#define jas_image_cmpthstep	(	image,
		cmptno
	)	((image)->cmpts_[cmptno]->hstep_)

Get the horizontal subsampling factor for a component.

◆ jas_image_cmptprec

#define jas_image_cmptprec	(	image,
		cmptno
	)	((image)->cmpts_[cmptno]->prec_)

Get the precision of the sample data for a component.

◆ jas_image_cmptsgnd

#define jas_image_cmptsgnd	(	image,
		cmptno
	)	((image)->cmpts_[cmptno]->sgnd_)

Get the signedness of the sample data for a component.

◆ jas_image_cmpttlx

#define jas_image_cmpttlx	(	image,
		cmptno
	)	((image)->cmpts_[cmptno]->tlx_)

Get the x-coordinate of the top-left corner of a component.

◆ jas_image_cmpttly

#define jas_image_cmpttly	(	image,
		cmptno
	)	((image)->cmpts_[cmptno]->tly_)

Get the y-coordinate of the top-left corner of a component.

◆ jas_image_cmptvstep

#define jas_image_cmptvstep	(	image,
		cmptno
	)	((image)->cmpts_[cmptno]->vstep_)

Get the vertical subsampling factor for a component.

◆ jas_image_cmptwidth

#define jas_image_cmptwidth	(	image,
		cmptno
	)	((image)->cmpts_[cmptno]->width_)

Get the width of a component.

◆ jas_image_height

#define jas_image_height ( image ) ((image)->bry_ - (image)->tly_)

Get the height of the image in units of the image reference grid.

◆ JAS_IMAGE_MAXFMTS

#define JAS_IMAGE_MAXFMTS 32

The maximum number of image data formats supported.

◆ jas_image_numcmpts

#define jas_image_numcmpts ( image ) ((image)->numcmpts_)

Get the number of image components.

◆ jas_image_setclrspc

#define jas_image_setclrspc	(	image,
		clrspc
	)	((image)->clrspc_ = (clrspc))

Set the color model for an image.

◆ jas_image_setcmprof

#define jas_image_setcmprof	(	image,
		cmprof
	)	((image)->cmprof_ = cmprof)

Set the color management profile for an image.

◆ jas_image_tlx

#define jas_image_tlx ( image ) ((image)->tlx_)

Get the x-coordinate of the top-left corner of the image bounding box on the reference grid.

◆ jas_image_tly

#define jas_image_tly ( image ) ((image)->tly_)

Get the y-coordinate of the top-left corner of the image bounding box on the reference grid.

◆ jas_image_width

#define jas_image_width ( image ) ((image)->brx_ - (image)->tlx_)

Get the width of the image in units of the image reference grid.

Typedef Documentation

◆ jas_image_cmpttype_t

typedef int_fast32_t jas_image_cmpttype_t

Component type (e.g., color, opacity).

◆ jas_image_colorspc_t

typedef int_fast16_t jas_image_colorspc_t

Color space (e.g., RGB, YCbCr).

◆ jas_image_coord_t

typedef int_fast32_t jas_image_coord_t

Image coordinate.

◆ jas_image_smpltype_t

typedef int_fast16_t jas_image_smpltype_t

Component sample data format (e.g., real/integer, signedness, precision).

Function Documentation

◆ jas_image_addcmpt()

JAS_EXPORT int jas_image_addcmpt	(	jas_image_t *	image,
		int	cmptno,
		const jas_image_cmptparm_t *	cmptparm
	)

Add a component to an image.

◆ jas_image_addfmt()

JAS_EXPORT int jas_image_addfmt	(	int	id,
		const char *	name,
		const char *	ext,
		const char *	desc,
		const jas_image_fmtops_t *	ops
	)

Add entry to table of image formats.

◆ jas_image_chclrspc()

JAS_EXPORT jas_image_t* jas_image_chclrspc	(	jas_image_t *	image,
		const jas_cmprof_t *	outprof,
		jas_cmxform_intent_t	intent
	)

Change the color space for an image.

◆ jas_image_clearfmts()

JAS_EXPORT void jas_image_clearfmts ( void )

Clear the table of image formats.

◆ jas_image_cmpt_domains_same()

JAS_ATTRIBUTE_PURE JAS_EXPORT bool jas_image_cmpt_domains_same ( const jas_image_t * image )

Test if all components are specified at the same positions in space.

◆ jas_image_copy()

JAS_EXPORT jas_image_t* jas_image_copy ( jas_image_t * image )

Clone an image.

◆ jas_image_copycmpt()

JAS_EXPORT int jas_image_copycmpt	(	jas_image_t *	dstimage,
		unsigned	dstcmptno,
		jas_image_t *	srcimage,
		unsigned	srccmptno
	)

Copy a component from one image to another.

◆ jas_image_create()

JAS_EXPORT jas_image_t* jas_image_create	(	unsigned	numcmpts,
		const jas_image_cmptparm_t *	cmptparms,
		jas_clrspc_t	clrspc
	)

Create an image.

◆ jas_image_create0()

JAS_EXPORT jas_image_t* jas_image_create0 ( void )

Create an "empty" image.

◆ jas_image_decode()

JAS_EXPORT jas_image_t* jas_image_decode	(	jas_stream_t *	in,
		int	fmt,
		const char *	optstr
	)

Create an image from a stream in some specified format.

◆ jas_image_delcmpt()

JAS_EXPORT void jas_image_delcmpt	(	jas_image_t *	image,
		unsigned	cmptno
	)

Delete a component from an image.

◆ jas_image_depalettize()

JAS_EXPORT int jas_image_depalettize	(	jas_image_t *	image,
		unsigned	cmptno,
		unsigned	numlutents,
		const int_fast32_t *	lutents,
		unsigned	dtype,
		unsigned	newcmptno
	)

Depalettize an image.

◆ jas_image_destroy()

JAS_EXPORT void jas_image_destroy ( jas_image_t * image )

Deallocate any resources associated with an image.

◆ jas_image_dump()

JAS_EXPORT int jas_image_dump	(	jas_image_t *	image,
		FILE *	out
	)

Dump the information for an image (for debugging).

◆ jas_image_encode()

JAS_EXPORT int jas_image_encode	(	jas_image_t *	image,
		jas_stream_t *	out,
		int	fmt,
		const char *	optstr
	)

Write an image to a stream in a specified format.

◆ jas_image_fmtfromname()

JAS_ATTRIBUTE_PURE JAS_EXPORT int jas_image_fmtfromname ( const char * filename )

Guess the format of an image file based on its name.

◆ jas_image_fmttostr()

JAS_ATTRIBUTE_CONST const JAS_EXPORT char* jas_image_fmttostr ( int fmt )

Get the name of the image format with the specified ID.

◆ jas_image_getcmptbytype()

JAS_ATTRIBUTE_PURE JAS_EXPORT int jas_image_getcmptbytype	(	const jas_image_t *	image,
		jas_image_cmpttype_t	ctype
	)

Get an image component by its type.

◆ jas_image_getfmt()

JAS_ATTRIBUTE_PURE JAS_EXPORT int jas_image_getfmt ( jas_stream_t * in )

Get the format of image data in a stream.

Note that only enabled codecs are used in determining the image format.

◆ jas_image_getfmtbyind()

const JAS_EXPORT jas_image_fmtinfo_t* jas_image_getfmtbyind ( int index )

Get a image format entry by its table index.

◆ jas_image_getnumfmts()

JAS_EXPORT int jas_image_getnumfmts ( void )

Get the number of image format table entries.

◆ jas_image_ishomosamp()

JAS_ATTRIBUTE_PURE JAS_EXPORT int jas_image_ishomosamp ( const jas_image_t * image )

Test if the sampling of the image is homogeneous.

◆ jas_image_lookupfmtbyid()

JAS_ATTRIBUTE_CONST const JAS_EXPORT jas_image_fmtinfo_t* jas_image_lookupfmtbyid ( int id )

Lookup image format information by the format ID.

◆ jas_image_lookupfmtbyname()

JAS_ATTRIBUTE_PURE const JAS_EXPORT jas_image_fmtinfo_t* jas_image_lookupfmtbyname ( const char * name )

Lookup image format information by the format name.

◆ jas_image_rawsize()

JAS_ATTRIBUTE_PURE JAS_EXPORT uint_fast32_t jas_image_rawsize ( const jas_image_t * image )

Get the raw size of an image (i.e., the nominal size of the image without any compression.

◆ jas_image_readcmpt()

JAS_EXPORT int jas_image_readcmpt	(	jas_image_t *	image,
		unsigned	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
	)

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.

◆ jas_image_readcmpt2()

JAS_EXPORT int jas_image_readcmpt2	(	jas_image_t *	image,
		unsigned	cmptno,
		jas_image_coord_t	x,
		jas_image_coord_t	y,
		jas_image_coord_t	width,
		jas_image_coord_t	height,
		long *	buf
	)

Read sample data in a component of an image.

◆ jas_image_readcmptsample()

JAS_EXPORT int jas_image_readcmptsample	(	jas_image_t *	image,
		unsigned	cmptno,
		unsigned	x,
		unsigned	y
	)

Read a component sample for an image.

◆ jas_image_sampcmpt()

JAS_EXPORT int jas_image_sampcmpt	(	jas_image_t *	image,
		unsigned	cmptno,
		unsigned	newcmptno,
		jas_image_coord_t	ho,
		jas_image_coord_t	vo,
		jas_image_coord_t	hs,
		jas_image_coord_t	vs,
		int	sgnd,
		unsigned	prec
	)

???

◆ jas_image_setfmtenable()

JAS_EXPORT int jas_image_setfmtenable	(	int	index,
		int	enabled
	)