Celartem::DjVu::PageInfo Struct Reference

#include <djv_utils.h>

Public Types
enum	{ DJVUVER_SUPPORTROTATION = 22, DJVUVER_RECOMMENDED = 25, DJVUVER_LATEST = 27 }
enum	Flags {   Compressible = 0x80, BgIsPalettized = 0x40, BgIsNotWhite = 0x20, ReservedBits = 0x18,   OrientationBits = 0x07 }

Public Member Functions
	PageInfo (size_t inWidth=0, size_t inHeight=0, size_t inDpi=300, size_t inGamma=22, size_t inFlags=1, size_t inVersion=25, size_t inReserved=0)
	PageInfo (Stream *inStream)
	PageInfo (const Chunk *inChunk)
void	decode (Stream *inStream)
void	decode (const Chunk *inChunk)
void	encode (Stream *inStream)
AutoPtr< Chunk >	encodeINFOChunk ()
Rotation	getRotation () const
void	setRotation (Rotation inRotation)

Public Attributes
size_t	width
	The width of the page. More...
size_t	height
	The height of the page. More...
size_t	version
	The version of the page. More...
size_t	reserved
	Reserved. Should be 0. More...
size_t	dpi
	The dpi (dot-per-inch) of the page. More...
size_t	gamma
	The gamma of the page. More...
size_t	flags
	The flags. More...

Detailed Description

This structure is used to get/set the information against INFO chunk.

Member Enumeration Documentation

anonymous enum

Enumerator
DJVUVER_SUPPORTROTATION	The version with which the rotation feature is introduced.
DJVUVER_RECOMMENDED	The version wide-spreadly used.
DJVUVER_LATEST	The latest version. (Introduces new print header/footer format)

enum Celartem::DjVu::PageInfo::Flags

The bits used with flags variable.

Enumerator
Compressible	Reserved.
BgIsPalettized	(SHOULD NOT BE USED) The background is palettized with foreground palette.
BgIsNotWhite	(SHOULD NOT BE USED) The background color is not white.
ReservedBits	Reserved.
OrientationBits	Bits used for preserving rotation status.

Constructor & Destructor Documentation

Celartem::DjVu::PageInfo::PageInfo ( size_t  inWidth = 0, size_t  inHeight = 0, size_t  inDpi = 300, size_t  inGamma = 22, size_t  inFlags = 1, size_t  inVersion = 25, size_t  inReserved = 0  )

inline

Initialize the data members.

Parameters

inWidth	The width of the page. See width.
inHeight	The height of the page. See height.
inDpi	The dpi (dot-per-inch) of the page. See dpi.
inGamma	The gamma of the page. See gamma.
inFlags	The additional flags. See flags.
inVersion	The version of the page. See version.
inReserved	Normally 0. See reserved.

Celartem::DjVu::PageInfo::PageInfo ( Stream *  inStream )

inline

This constructor initializes the structure by loading INFO chunk from the specified stream.

Parameters

inStream

Stream to read.

Celartem::DjVu::PageInfo::PageInfo ( const Chunk *  inChunk )

inline

This constructor initializes the structure by loading INFO chunk from the specified Chunk instance.

Parameters

inChunk

Chunk to decode.

Member Function Documentation

void Celartem::DjVu::PageInfo::decode ( Stream *  inStream )

inline

Decodes the INFO chunk from the specified stream.

Parameters

inStream

Stream to read.

Referenced by decode(), and PageInfo().

void Celartem::DjVu::PageInfo::decode ( const Chunk *  inChunk )

inline

Decodes the specified INFO chunk.

Parameters

inChunk

Pointer to the Chunk instance which contains INFO chunk.

void Celartem::DjVu::PageInfo::encode ( Stream *  inStream )

inline

Converts the current status of this instance to INFO chunk and write out to the specified stream.

Parameters

inStream

Stream to write on.

Referenced by encodeINFOChunk().

AutoPtr<Chunk> Celartem::DjVu::PageInfo::encodeINFOChunk ( )

inline

Converts the current status of this instance to INFO chunk.

Returns

Pointer to the newly created Chunk instance.

Rotation Celartem::DjVu::PageInfo::getRotation ( ) const

inline

Returns the rotation status according to the current flags variable.

Returns

The rotation status.

void Celartem::DjVu::PageInfo::setRotation ( Rotation  inRotation )

inline

Sets the rotation status to the current flags variable.
Please note that if the version is smaller than DJVUVER_SUPPORTROTATION (22), this method internally updates the file version.

Parameters

inRotation

The rotation status to set.

Member Data Documentation

size_t Celartem::DjVu::PageInfo::dpi

The dpi (dot-per-inch) of the page.

Normally, DjVu uses 300 dpi.

Referenced by decode(), and encode().

size_t Celartem::DjVu::PageInfo::flags

The flags.

Traditionally, the flags has many meanings but currently, only rotation specification is used.
To access rotation status, you had better use setRotation and getRotation methods.

The rotation feature seems to have introduced with DjVu file format version 22. And the following values are supported by the current viewer:

0 or 1	0 degree
6 or 7	90 degree
2 or 3	180 degree
4 or 5	270 degree

Referenced by decode(), encode(), getRotation(), and setRotation().

size_t Celartem::DjVu::PageInfo::gamma

The gamma of the page.

The value should be 10 times of the actual gamma. If you set gamma 2.2, this value is 22.
You had better keep the value to 22.

Referenced by decode(), and encode().

size_t Celartem::DjVu::PageInfo::height

The height of the page.

In pixels. It should be no more than 65535. Note that this is the height of the original and before rotation.

Referenced by decode(), and encode().

size_t Celartem::DjVu::PageInfo::reserved

Reserved. Should be 0.

In the spec, this is described as "Major Version". Currently, this should be 0.

Referenced by decode(), and encode().

size_t Celartem::DjVu::PageInfo::version

The version of the page.

In the spec, this is described as "Minor Version".

DjVu Ver.	Viewer Ver.	Notes
22	?	Add support for page rotation feature.
25	5.X	Wide-spreaded version.
26	6.0	Add support for Line/Text annotation.

Referenced by decode(), encode(), getRotation(), and setRotation().

size_t Celartem::DjVu::PageInfo::width

The width of the page.

In pixels. It should be no more than 65535. Note that this is the width of the original and before rotation.

Referenced by decode(), and encode().

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The documentation for this struct was generated from the following file:

• djv_utils.h