JasPer 4.2.9 |

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Image Representation

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.
#define | jas_image_width(image)
| Get the width of the image in units of the image reference grid.
#define | jas_image_height(image)
| Get the height of the image in units of the image reference grid.
#define | jas_image_tlx(image)
| Get the x-coordinate of the top-left corner of the image bounding box on the reference grid.
#define | jas_image_tly(image)
| Get the y-coordinate of the top-left corner of the image bounding box on the reference grid.
#define | jas_image_brx(image)
| Get the x-coordinate of the bottom-right corner of the image bounding box on the reference grid (plus one).
#define | jas_image_bry(image)
| Get the y-coordinate of the bottom-right corner of the image bounding box on the reference grid (plus one).
#define | jas_image_numcmpts(image)
| Get the number of image components.
#define | jas_image_clrspc(image)
| Get the color model used by the image.
#define | jas_image_setclrspc(image, clrspc)
| Set the color model for an image.
#define | jas_image_cmptwidth(image, cmptno)
| Get the width of a component.
#define | jas_image_cmptheight(image, cmptno)
| Get the height of a component.
#define | jas_image_cmptsgnd(image, cmptno)
| Get the signedness of the sample data for a component.
#define | jas_image_cmptprec(image, cmptno)
| Get the precision of the sample data for a component.
#define | jas_image_cmpthstep(image, cmptno)
| Get the horizontal subsampling factor for a component.
#define | jas_image_cmptvstep(image, cmptno)
| Get the vertical subsampling factor for a component.
#define | jas_image_cmpttlx(image, cmptno)
| Get the x-coordinate of the top-left corner of a component.
#define | jas_image_cmpttly(image, cmptno)
| Get the y-coordinate of the top-left corner of a component.
#define | jas_image_cmptbrx(image, cmptno)
| Get the x-coordinate of the bottom-right corner of a component (plus "one").
#define | jas_image_cmptbry(image, cmptno)
| Get the y-coordinate of the bottom-right corner of a component (plus "one").
#define | jas_image_cmprof(image)
| Get the color management profile of an image.
#define | jas_image_setcmprof(image, cmprof)
| Set the color management profile for an image.

## Typedefs
typedef int_fast32_t | jas_image_coord_t
| Image coordinate.
typedef int_fast16_t | jas_image_colorspc_t
| Color space (e.g., RGB, YCbCr).
typedef int_fast32_t | jas_image_cmpttype_t
| Component type (e.g., color, opacity).
typedef int_fast16_t | jas_image_smpltype_t
| Component sample data format (e.g., real/integer, signedness, precision).

## Functions
JAS_EXPORT jas_image_t * | jas_image_create (unsigned numcmpts, const jas_image_cmptparm_t *cmptparms, jas_clrspc_t clrspc)
| Create an image.
JAS_EXPORT jas_image_t * | jas_image_create0 (void)
| Create an "empty" image.
JAS_EXPORT jas_image_t * | jas_image_copy (jas_image_t *image)
| Clone an image.
JAS_EXPORT void | jas_image_destroy (jas_image_t *image)
| Deallocate any resources associated with an image.
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_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_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_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_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.
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.
JAS_EXPORT void | jas_image_delcmpt (jas_image_t *image, unsigned cmptno)
| Delete a component from an image.
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_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_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_EXPORT int | jas_image_readcmptsample (jas_image_t *image, unsigned cmptno, unsigned x, unsigned y)
| Read a component sample for an image.
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.
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_EXPORT void | jas_image_clearfmts (void)
| Clear the table of image formats.
JAS_EXPORT const jas_image_fmtinfo_t * | jas_image_getfmtbyind (int index)
| Get a image format entry by its table index.
JAS_EXPORT int | jas_image_getnumfmts (void)
| Get the number of image format table entries.
JAS_EXPORT int | jas_image_setfmtenable (int index, int enabled)
| Get the number of image format table entries.
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_ATTRIBUTE_PURE JAS_EXPORT int | jas_image_strtofmt (const char *s)
| Get the ID for the image format with the specified name.
JAS_ATTRIBUTE_CONST JAS_EXPORT const char * | jas_image_fmttostr (int fmt)
| Get the name of the image format with the specified ID.
JAS_ATTRIBUTE_CONST JAS_EXPORT const jas_image_fmtinfo_t * | jas_image_lookupfmtbyid (int id)
| Lookup image format information by the format ID.
JAS_ATTRIBUTE_PURE JAS_EXPORT const jas_image_fmtinfo_t * | jas_image_lookupfmtbyname (const char *name)
| Lookup image format information by the format name.
JAS_ATTRIBUTE_PURE JAS_EXPORT int | jas_image_fmtfromname (const char *filename)
| Guess the format of an image file based on its name.
JAS_ATTRIBUTE_PURE JAS_EXPORT int | jas_image_getfmt (jas_stream_t *in)
| Get the format of image data in a stream.
JAS_ATTRIBUTE_PURE JAS_EXPORT int | jas_image_ishomosamp (const jas_image_t *image)
| Test if the sampling of the image is homogeneous.
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_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.
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_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_EXPORT int | jas_image_dump (jas_image_t *image, FILE *out)
| Dump the information for an image (for debugging).

## Detailed Description

Image Representation.

General information can be found here.

## Macro Definition Documentation

## ◆ jas_image_brx

#define jas_image_brx | ( |  | image | ) |

Value:
((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 | ) |

Value:
((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 | ) |

Value:
((image)->clrspc_)

Get the color model used by the image.

## ◆ jas_image_cmprof

#define jas_image_cmprof | ( |  | image | ) |

Value:
((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 )

Value:
((image)->cmpts_[cmptno]->height_)

Get the height of a component.

## ◆ jas_image_cmpthstep

#define jas_image_cmpthstep | ( |  | image,
|  |  | cmptno )

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

Get the horizontal subsampling factor for a component.

## ◆ jas_image_cmptprec

#define jas_image_cmptprec | ( |  | image,
|  |  | cmptno )

Value:
((image)->cmpts_[cmptno]->prec_)

Get the precision of the sample data for a component.

## ◆ jas_image_cmptsgnd

#define jas_image_cmptsgnd | ( |  | image,
|  |  | cmptno )

Value:
((image)->cmpts_[cmptno]->sgnd_)

Get the signedness of the sample data for a component.

## ◆ jas_image_cmpttlx

#define jas_image_cmpttlx | ( |  | image,
|  |  | cmptno )

Value:
((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 )

Value:
((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 )

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

Get the vertical subsampling factor for a component.

## ◆ jas_image_cmptwidth

#define jas_image_cmptwidth | ( |  | image,
|  |  | cmptno )

Value:
((image)->cmpts_[cmptno]->width_)

Get the width of a component.

## ◆ jas_image_height

#define jas_image_height | ( |  | image | ) |

Value:
((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 | ) |

Value:
((image)->numcmpts_)

Get the number of image components.

## ◆ jas_image_setclrspc

#define jas_image_setclrspc | ( |  | image,
|  |  | clrspc )

Value:
((image)->clrspc_ = (clrspc))

Set the color model for an image.

## ◆ jas_image_setcmprof

#define jas_image_setcmprof | ( |  | image,
|  |  | cmprof )

Value:
((image)->cmprof_ = cmprof)

Set the color management profile for an image.

## ◆ jas_image_tlx

#define jas_image_tlx | ( |  | image | ) |

Value:
((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 | ) |

Value:
((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 | ) |

Value:
((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 JAS_EXPORT const 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()

JAS_EXPORT const 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 JAS_EXPORT const jas_image_fmtinfo_t * jas_image_lookupfmtbyid | ( | int | id | ) |

Lookup image format information by the format ID.

## ◆ jas_image_lookupfmtbyname()

JAS_ATTRIBUTE_PURE JAS_EXPORT const 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 )

Get the number of image format table entries.

Warning
  This function may be removed in future versions of the library. Do not rely on it.

## ◆ jas_image_strtofmt()

JAS_ATTRIBUTE_PURE JAS_EXPORT int jas_image_strtofmt | ( | const char * | s | ) |

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

## ◆ jas_image_writecmpt()

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.

## ◆ jas_image_writecmpt2()

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.

## ◆ jas_image_writecmptsample()

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.