Ogre::Image Class Reference

Class representing an image file. More...

#include <OgreImage.h>

List of all members.

Public Types

typedef Ogre::Box Box

typedef Ogre::Rect Rect

enum Filter {
FILTER_NEAREST, FILTER_LINEAR, FILTER_BILINEAR, FILTER_BOX,
FILTER_TRIANGLE, FILTER_BICUBIC
}

Public Member Functions

Image ()

Standard constructor.

Image (const Image &img)

Copy-constructor - copies all the data from the target image.

virtual ~Image ()

Standard destructor.

Image & operator= (const Image &img)

Assignment operator - copies all the data from the target image.

Image & flipAroundY ()

Flips (mirrors) the image around the Y-axis.

Image & flipAroundX ()

Flips (mirrors) the image around the X-axis.

Image & Image::loadDynamicImage (uchar *pData, size_t uWidth, size_t uHeight, size_t depth, PixelFormat eFormat, bool autoDelete=false, size_t numFaces=1, size_t numMipMaps=0)

Stores a pointer to raw data in memory.

Image & loadDynamicImage (uchar *pData, size_t uWidth, size_t uHeight, PixelFormat eFormat)

Stores a pointer to raw data in memory.

Image & loadRawData (DataStreamPtr &stream, size_t uWidth, size_t uHeight, size_t uDepth, PixelFormat eFormat, size_t numFaces=1, size_t numMipMaps=0)

Loads raw data from a stream.

Image & loadRawData (DataStreamPtr &stream, size_t uWidth, size_t uHeight, PixelFormat eFormat)

Loads raw data from a stream.

Image & load (const String &strFileName, const String &groupName)

Loads an image file.

Image & load (DataStreamPtr &stream, const String &type)

Loads an image file from a stream.

void save (const String &filename)

Save the image as a file.

uchar * getData (void)

Returns a pointer to the internal image buffer.

const uchar * getData () const

Returns a const pointer to the internal image buffer.

size_t getSize () const

Returns the size of the data buffer.

size_t getNumMipmaps () const

Returns the number of mipmaps contained in the image.

bool hasFlag (const ImageFlags imgFlag) const

Returns true if the image has the appropriate flag set.

size_t getWidth (void) const

Gets the width of the image in pixels.

size_t getHeight (void) const

Gets the height of the image in pixels.

size_t getDepth (void) const

Gets the depth of the image.

size_t getNumFaces (void) const

Get the numer of faces of the image.

size_t getRowSpan (void) const

Gets the physical width in bytes of each row of pixels.

PixelFormat getFormat () const

Returns the image format.

uchar getBPP () const

Returns the number of bits per pixel.

bool getHasAlpha () const

Returns true if the image has an alpha component.

ColourValue getColourAt (int x, int y, int z)

Get colour value from a certain location in the image.

PixelBox getPixelBox (size_t face=0, size_t mipmap=0) const

Get a PixelBox encapsulating the image data of a mipmap.

void resize (ushort width, ushort height, Filter filter=FILTER_BILINEAR)

Resize a 2D image, applying the appropriate filter.

Static Public Member Functions

void applyGamma (uchar *buffer, Real gamma, size_t size, uchar bpp)

Does gamma adjustment.

void scale (const PixelBox &src, const PixelBox &dst, Filter filter=FILTER_BILINEAR)

Scale a 1D, 2D or 3D image volume.

size_t calculateSize (size_t mipmaps, size_t faces, size_t width, size_t height, size_t depth, PixelFormat format)

Private Attributes

size_t m_uWidth

size_t m_uHeight

size_t m_uDepth

size_t m_uSize

size_t m_uNumMipmaps

int m_uFlags

PixelFormat m_eFormat

uchar m_ucPixelSize

uchar * m_pBuffer

bool m_bAutoDelete

Detailed Description

Class representing an image file.

Remarks:: The Image class usually holds uncompressed image data and is the only object that can be loaded in a texture. Image objects handle image data decoding themselves by the means of locating the correct Codec object for each data type.

: Typically, you would want to use an Image object to load a texture when extra processing needs to be done on an image before it is loaded or when you want to blit to an existing texture.

Definition at line 52 of file OgreImage.h.

Member Typedef Documentation

typedef Ogre::Box Ogre::Image::Box

Definition at line 55 of file OgreImage.h.

typedef Ogre::Rect Ogre::Image::Rect

Definition at line 56 of file OgreImage.h.

Member Enumeration Documentation

enum Ogre::Image::Filter

Enumeration values:

FILTER_NEAREST

FILTER_LINEAR

FILTER_BILINEAR

FILTER_BOX

FILTER_TRIANGLE

FILTER_BICUBIC

Definition at line 300 of file OgreImage.h.

Constructor & Destructor Documentation

Ogre::Image::Image ( )

Standard constructor.

Ogre::Image::Image ( const Image & img )

Copy-constructor - copies all the data from the target image.

virtual Ogre::Image::~Image ( ) [virtual]

Standard destructor.

Member Function Documentation

void Ogre::Image::applyGamma ( uchar * buffer,

Real gamma,

size_t size,

uchar bpp

) [static]

Does gamma adjustment.

Note:
Basic algo taken from Titan Engine, copyright (c) 2000 Ignacio Castano Iguado

size_t Ogre::Image::calculateSize ( size_t mipmaps,

size_t faces,

size_t width,

size_t height,

size_t depth,

PixelFormat format

) [static]

Image& Ogre::Image::flipAroundX ( )

Flips (mirrors) the image around the X-axis.

Remarks:
An example of an original and flipped image:
flip axis | originalimg|gmilanigiro 00000000000|00000000000 00000000000|00000000000 00000000000|00000000000 00000000000|00000000000 00000000000|00000000000

Image& Ogre::Image::flipAroundY ( )

Flips (mirrors) the image around the Y-axis.

Remarks:
An example of an original and flipped image:
originalimg 00000000000 00000000000 00000000000 00000000000 00000000000 ------------> flip axis 00000000000 00000000000 00000000000 00000000000 00000000000 originalimg

uchar Ogre::Image::getBPP ( ) const

Returns the number of bits per pixel.

ColourValue Ogre::Image::getColourAt ( int x,

int y,

int z

)

Get colour value from a certain location in the image.
The z coordinate is only valid for cubemaps and volume textures. This uses the first (largest) mipmap.

const uchar* Ogre::Image::getData ( ) const

Returns a const pointer to the internal image buffer.

uchar* Ogre::Image::getData ( void )

Returns a pointer to the internal image buffer.

size_t Ogre::Image::getDepth ( void ) const

Gets the depth of the image.

PixelFormat Ogre::Image::getFormat ( ) const

Returns the image format.

bool Ogre::Image::getHasAlpha ( ) const

Returns true if the image has an alpha component.

size_t Ogre::Image::getHeight ( void ) const

Gets the height of the image in pixels.

size_t Ogre::Image::getNumFaces ( void ) const

Get the numer of faces of the image.
This is usually 6 for a cubemap, and 1 for a normal image.

size_t Ogre::Image::getNumMipmaps ( ) const

Returns the number of mipmaps contained in the image.

PixelBox Ogre::Image::getPixelBox ( size_t face = 0,

size_t mipmap = 0

) const

Get a PixelBox encapsulating the image data of a mipmap.

size_t Ogre::Image::getRowSpan ( void ) const

Gets the physical width in bytes of each row of pixels.

size_t Ogre::Image::getSize ( ) const

Returns the size of the data buffer.

size_t Ogre::Image::getWidth ( void ) const

Gets the width of the image in pixels.

bool Ogre::Image::hasFlag ( const ImageFlags imgFlag ) const

Returns true if the image has the appropriate flag set.

Image& Ogre::Image::Image::loadDynamicImage ( uchar * pData,

size_t uWidth,

size_t uHeight,

size_t depth,

PixelFormat eFormat,

bool autoDelete = false,

size_t numFaces = 1,

size_t numMipMaps = 0

)

Stores a pointer to raw data in memory.
The pixel format has to be specified.
Remarks:
This method loads an image into memory held in the object. The pixel format will be either greyscale or RGB with an optional Alpha component. The type can be determined by calling getFormat().

Parameters:

The data pointer

Width of image

Height of image

Image Depth (in 3d images, numbers of layers, otherwhise 1)

Pixel Format

if memory associated with this buffer is to be destroyed with the Image object.

the number of faces the image data has inside (6 for cubemaps, 1 otherwise)

the number of mipmaps the image data has inside

Note:
The memory associated with this buffer is NOT destroyed with the Image object, unless autoDelete is set to true.

Remarks:
The size of the buffer must be numFaces*PixelUtil::getMemorySize(width, height, depth, format)

Image& Ogre::Image::load ( DataStreamPtr & stream,

const String & type

)

Loads an image file from a stream.

Remarks:
This method works in the same way as the filename-based load method except it loads the image from a DataStream object. This DataStream is expected to contain the encoded data as it would be held in a file.

Parameters:

stream The source data.

type The type of the image. Used to decide what decompression codec to use.

See also:
Image::load( const String& strFileName )

Image& Ogre::Image::load ( const String & strFileName,

const String & groupName

)

Loads an image file.

Remarks:
This method loads an image into memory held in the object. The pixel format will be either greyscale or RGB with an optional Alpha component. The type can be determined by calling getFormat().

Parameters:

strFileName Name of a file file to load.

groupName Name of the resource group to search for the image

Note:
The memory associated with this buffer is destroyed with the Image object.

Image& Ogre::Image::loadDynamicImage ( uchar * pData,

size_t uWidth,

size_t uHeight,

PixelFormat eFormat

)

Stores a pointer to raw data in memory.
The pixel format has to be specified.
Remarks:
This method loads an image into memory held in the object. The pixel format will be either greyscale or RGB with an optional Alpha component. The type can be determined by calling getFormat().

Parameters:

The data pointer

Width of image

Height of image

Pixel Format

Note:
The memory associated with this buffer is NOT destroyed with the Image object.

Remarks:
This function is deprecated; one should really use the Image::loadDynamicImage(pData, width, height, depth, format, ...) to be compatible with future Ogre versions.

Definition at line 165 of file OgreImage.h.
References Ogre::uchar.

Image& Ogre::Image::loadRawData ( DataStreamPtr & stream,

size_t uWidth,

size_t uHeight,

PixelFormat eFormat

)

Loads raw data from a stream.
The pixel format has to be specified.
Remarks:
This function is deprecated; one should really use the Image::loadRawData(stream, width, height, depth, format, ...) to be compatible with future Ogre versions.

Definition at line 185 of file OgreImage.h.
References Ogre::DataStreamPtr.

Image& Ogre::Image::loadRawData ( DataStreamPtr & stream,

size_t uWidth,

size_t uHeight,

size_t uDepth,

PixelFormat eFormat,

size_t numFaces = 1,

size_t numMipMaps = 0

)

Loads raw data from a stream.
See the function loadDynamicImage for a description of the parameters.
Remarks:
The size of the buffer must be numFaces*PixelUtil::getMemorySize(width, height, depth, format)

Image& Ogre::Image::operator= ( const Image & img )

Assignment operator - copies all the data from the target image.

void Ogre::Image::resize ( ushort width,

ushort height,

Filter filter = FILTER_BILINEAR

)

Resize a 2D image, applying the appropriate filter.

void Ogre::Image::save ( const String & filename )

Save the image as a file.

void Ogre::Image::scale ( const PixelBox & src,

const PixelBox & dst,

Filter filter = FILTER_BILINEAR

) [static]

Scale a 1D, 2D or 3D image volume.

Parameters:

src PixelBox containing the source pointer, dimensions and format

dst PixelBox containing the destination pointer, dimensions and format

filter Which filter to use

Remarks:
This function can do pixel format conversion in the process.

Note:
dst and src can point to the same PixelBox object without any problem

Member Data Documentation

bool Ogre::Image::m_bAutoDelete [private]

Definition at line 345 of file OgreImage.h.

PixelFormat Ogre::Image::m_eFormat [private]

Definition at line 338 of file OgreImage.h.

uchar* Ogre::Image::m_pBuffer [private]

Definition at line 342 of file OgreImage.h.

uchar Ogre::Image::m_ucPixelSize [private]

Definition at line 341 of file OgreImage.h.

size_t Ogre::Image::m_uDepth [private]

Definition at line 329 of file OgreImage.h.

int Ogre::Image::m_uFlags [private]

Definition at line 335 of file OgreImage.h.

size_t Ogre::Image::m_uHeight [private]

Definition at line 327 of file OgreImage.h.

size_t Ogre::Image::m_uNumMipmaps [private]

Definition at line 333 of file OgreImage.h.

size_t Ogre::Image::m_uSize [private]

Definition at line 331 of file OgreImage.h.

size_t Ogre::Image::m_uWidth [private]

Definition at line 325 of file OgreImage.h.

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

OgreImage.h


Public Types
typedef Ogre::Box	Box
typedef Ogre::Rect	Rect
enum	Filter { FILTER_NEAREST, FILTER_LINEAR, FILTER_BILINEAR, FILTER_BOX, FILTER_TRIANGLE, FILTER_BICUBIC }
Public Member Functions
	Image ()
	Standard constructor.
	Image (const Image &img)
	Copy-constructor - copies all the data from the target image.
virtual	~Image ()
	Standard destructor.
Image &	operator= (const Image &img)
	Assignment operator - copies all the data from the target image.
Image &	flipAroundY ()
	Flips (mirrors) the image around the Y-axis.
Image &	flipAroundX ()
	Flips (mirrors) the image around the X-axis.
Image &	Image::loadDynamicImage (uchar *pData, size_t uWidth, size_t uHeight, size_t depth, PixelFormat eFormat, bool autoDelete=false, size_t numFaces=1, size_t numMipMaps=0)
	Stores a pointer to raw data in memory.
Image &	loadDynamicImage (uchar *pData, size_t uWidth, size_t uHeight, PixelFormat eFormat)
	Stores a pointer to raw data in memory.
Image &	loadRawData (DataStreamPtr &stream, size_t uWidth, size_t uHeight, size_t uDepth, PixelFormat eFormat, size_t numFaces=1, size_t numMipMaps=0)
	Loads raw data from a stream.
Image &	loadRawData (DataStreamPtr &stream, size_t uWidth, size_t uHeight, PixelFormat eFormat)
	Loads raw data from a stream.
Image &	load (const String &strFileName, const String &groupName)
	Loads an image file.
Image &	load (DataStreamPtr &stream, const String &type)
	Loads an image file from a stream.
void	save (const String &filename)
	Save the image as a file.
uchar *	getData (void)
	Returns a pointer to the internal image buffer.
const uchar *	getData () const
	Returns a const pointer to the internal image buffer.
size_t	getSize () const
	Returns the size of the data buffer.
size_t	getNumMipmaps () const
	Returns the number of mipmaps contained in the image.
bool	hasFlag (const ImageFlags imgFlag) const
	Returns true if the image has the appropriate flag set.
size_t	getWidth (void) const
	Gets the width of the image in pixels.
size_t	getHeight (void) const
	Gets the height of the image in pixels.
size_t	getDepth (void) const
	Gets the depth of the image.
size_t	getNumFaces (void) const
	Get the numer of faces of the image.
size_t	getRowSpan (void) const
	Gets the physical width in bytes of each row of pixels.
PixelFormat	getFormat () const
	Returns the image format.
uchar	getBPP () const
	Returns the number of bits per pixel.
bool	getHasAlpha () const
	Returns true if the image has an alpha component.
ColourValue	getColourAt (int x, int y, int z)
	Get colour value from a certain location in the image.
PixelBox	getPixelBox (size_t face=0, size_t mipmap=0) const
	Get a PixelBox encapsulating the image data of a mipmap.
void	resize (ushort width, ushort height, Filter filter=FILTER_BILINEAR)
	Resize a 2D image, applying the appropriate filter.
Static Public Member Functions
void	applyGamma (uchar *buffer, Real gamma, size_t size, uchar bpp)
	Does gamma adjustment.
void	scale (const PixelBox &src, const PixelBox &dst, Filter filter=FILTER_BILINEAR)
	Scale a 1D, 2D or 3D image volume.
size_t	calculateSize (size_t mipmaps, size_t faces, size_t width, size_t height, size_t depth, PixelFormat format)
Private Attributes
size_t	m_uWidth
size_t	m_uHeight
size_t	m_uDepth
size_t	m_uSize
size_t	m_uNumMipmaps
int	m_uFlags
PixelFormat	m_eFormat
uchar	m_ucPixelSize
uchar *	m_pBuffer
bool	m_bAutoDelete