SoSFImage Class Reference
[Fields]

Field containing a 2D image. More...

#include <Inventor/fields/SoSFImage.h>

Inheritance diagram for SoSFImage:

Public Types
enum	DataType { UNSIGNED_BYTE = SbDataType::UNSIGNED_BYTE, UNSIGNED_SHORT = SbDataType::UNSIGNED_SHORT, UNSIGNED_INT32 = SbDataType::UNSIGNED_INT32, SIGNED_BYTE = SbDataType::SIGNED_BYTE, SIGNED_SHORT = SbDataType::SIGNED_SHORT, SIGNED_INT32 = SbDataType::SIGNED_INT32, FLOAT = SbDataType::FLOAT }
enum	CopyPolicy { COPY = 0, NO_COPY = 1, NO_COPY_AND_DELETE = 2, NO_COPY_AND_FREE = 3 }
Public Member Functions
virtual SoType	getTypeId () const
const SoSFImage &	operator= (const SoSFImage &f)
	SoSFImage ()
virtual	~SoSFImage ()
	SoSFImage (const SoSFImage &obj)
const void *	getValue (SbVec2s &size, int &nc, DataType &dataType) const
const void *	getValue (SbVec2i32 &size, int &nc, DataType &dataType) const
const unsigned char *	getValue (SbVec2s &size, int &nc) const
const unsigned char *	getValue (SbVec2i32 &size, int &nc) const
void	setValue (const SbVec2s &size, int nc, DataType dataType, const void *data, CopyPolicy copy=COPY)
void	setValue (const SbVec2s &size, int nc, DataType dataType, SoBufferObject *bufferObject, CopyPolicy copy=COPY)
void	setValue (const SbVec2i32 &size, int nc, DataType dataType, const void *data, CopyPolicy copy=COPY)
void	setValue (const SbVec2i32 &size, int nc, DataType dataType, SoBufferObject *bufferObject, CopyPolicy copy=COPY)
void	setValue (const SbVec2s &size, int nc, const unsigned char *bytes, CopyPolicy copy=COPY)
void	setValue (const SbVec2i32 &size, int nc, const unsigned char *bytes, CopyPolicy copy=COPY)
void	setSubValue (const SbVec2s &subSize, const SbVec2s &offset, void *data)
void	setSubValue (const SbVec2i32 &subSize, const SbVec2i32 &offset, void *data)
void	setSubValue (const SbVec2s &subSize, const SbVec2s &offset, unsigned char *bytes)
void	setSubValue (const SbVec2i32 &subSize, const SbVec2i32 &offset, unsigned char *bytes)
void	setSubValues (const SbVec2s subSizes, const SbVec2s offsets, int num, void **data)
void	setSubValues (const SbVec2i32 subSizes, const SbVec2i32 offsets, int num, void **data)
void	setSubValues (const SbVec2s subSizes, const SbVec2s offsets, int num, unsigned char **subBytes)
void	setSubValues (const SbVec2i32 subSizes, const SbVec2i32 offsets, int num, unsigned char **subBytes)
int	operator== (const SoSFImage &f) const
int	operator!= (const SoSFImage &f) const
void *	startEditing (SbVec2s &size, int &nc, DataType &dataType)
void *	startEditing (SbVec2i32 &size, int &nc, DataType &dataType)
unsigned char *	startEditing (SbVec2s &size, int &nc)
unsigned char *	startEditing (SbVec2i32 &size, int &nc)
void	finishEditing ()
void *	getSubTexture (int index, SbVec2s &size, SbVec2s &offset, DataType &dataType)
void *	getSubTexture (int index, SbVec2i32 &size, SbVec2i32 &offset, DataType &dataType)
unsigned char *	getSubTexture (int index, SbVec2s &size, SbVec2s &offset)
unsigned char *	getSubTexture (int index, SbVec2i32 &size, SbVec2i32 &offset)
SbBool	hasSubTextures (int &numSubTextures)
void	setNeverWrite (SbBool neverWrite)
SbBool	isNeverWrite ()
SbBool	hasTransparency () const
SbRasterImage *	toRasterImage (bool downSample=true) const
int	getNumComponents () const
Static Public Member Functions
static SoType	getClassTypeId ()

Detailed Description

Field containing a 2D image.

A field containing a two-dimensional image. Images can be grayscale (intensity), grayscale with transparency information, RGB, or RGB with transparency. Each component of the image (intensity, red, green, blue or transparency (alpha)) can have an unsigned one-byte value from 0 to 255.

Values are returned as arrays of unsigned chars. The image is stored in this array starting at the bottom left corner of the image with the intensity or red component of that pixel, followed by either the alpha, the green and blue, or the green, blue and alpha components (depending on the number of components in the image). The next value is the first component of the next pixel to the right.

SoSFImages are written to file as three integers representing the width, height and number of components in the image, followed by width*height hexadecimal values representing the pixels in the image, separated by whitespace. A one-component image will have one-byte hexadecimal values representing the intensity of the image. For example, 0xFF is full intensity, 0x00 is no intensity. A two-component image puts the intensity in the first (high) byte and the transparency in the second (low) byte. Pixels in a three-component image have the red component in the first (high) byte, followed by the green and blue components (so 0xFF0000 is red). Four-component images put the transparency byte after red/green/blue (so 0x0000FF80 is semi-transparent blue). Note: each pixel is actually read as a single unsigned number, so a 3-component pixel with value "0x0000FF" can also be written as "0xFF" or "255" (decimal).

For example,

     1 2 1 0xFF 0x00

is a 1 pixel wide by 2 pixel high grayscale image, with the bottom pixel white and the top pixel black. And:

     2 4 3 0xFF0000 0xFF00 0 0 0 0 0xFFFFFF 0xFFFF00

is a 2 pixel wide by 4 pixel high RGB image, with the bottom left pixel red, the bottom right pixel green, the two middle rows of pixels black, the top left pixel white, and the top right pixel yellow.

Member Enumeration Documentation

enum SoSFImage::CopyPolicy

SoSFImage may be manipulating some large amounts of memory.

It is therefore convienent to be able to set the memory usage policy dynamically. By default, the memory policy is COPY, which is consistent with other OIV fields. The most likely to be efficient is NO_COPY. See also setNeverWrite.

Enumerator:

COPY	Open Inventor will make a copy of the data (default).
NO_COPY	Passed buffer used , user will delete.
NO_COPY_AND_DELETE	Passed buffer used, SoSFImage will delete. Use this if memory is allocated with "new".
NO_COPY_AND_FREE	Passed buffer used, SoSFImage will free. Use this if memory is allocated with "malloc".

enum SoSFImage::DataType

Encoding data type.

UNSIGNED_BYTE by default.

Enumerator:

UNSIGNED_BYTE	UNSIGNED_BYTE.
UNSIGNED_SHORT	UNSIGNED_SHORT.
UNSIGNED_INT32	UNSIGNED_INT32.
SIGNED_BYTE	SIGNED_BYTE.
SIGNED_SHORT	SIGNED_SHORT.
SIGNED_INT32	SIGNED_INT32.
FLOAT	FLOAT.

Constructor & Destructor Documentation

SoSFImage::SoSFImage ( )

Default constructor.

virtual SoSFImage::~SoSFImage ( ) [virtual]

Destructor.

SoSFImage::SoSFImage ( const SoSFImage & obj )

Copy constructor.

Member Function Documentation

void SoSFImage::finishEditing ( )

This method (along with startEditing())can be used to efficiently edit the values in an image field.

Doing a start/finishEditing is the same as doing a call to setSubValues on the whole texture. The getSubTexture will return one more updated regions when called after finishEditing.

static SoType SoSFImage::getClassTypeId ( ) [static]

Returns the type identifier for this class.

Reimplemented from SoSField.

int SoSFImage::getNumComponents ( ) const [inline]

Returns image's number of components.

unsigned char* SoSFImage::getSubTexture	(	int	index,
		SbVec2i32 &	size,
		SbVec2i32 &	offset
	)

unsigned char* SoSFImage::getSubTexture	(	int	index,
		SbVec2s &	size,
		SbVec2s &	offset
	)

Same as above.

Convenience method for the unsigned char datatype.

void* SoSFImage::getSubTexture	(	int	index,
		SbVec2i32 &	size,
		SbVec2i32 &	offset,
		DataType &	dataType
	)

void* SoSFImage::getSubTexture	(	int	index,
		SbVec2s &	size,
		SbVec2s &	offset,
		DataType &	dataType
	)

Returns a buffer of a given subTexture set by setSubValue(), setSubValues() or a startEditing()/finishEditing() pair.

These methods append subTextures to a list. Also returns the size of the subtexture, the offset from the beginning of the image and the data type of the requested subImage.

virtual SoType SoSFImage::getTypeId ( ) const [virtual]

Returns the type identifier for this specific instance.

Implements SoTypedObject.

const unsigned char* SoSFImage::getValue	(	SbVec2i32 &	size,
		int &	nc
	)			const

const unsigned char* SoSFImage::getValue	(	SbVec2s &	size,
		int &	nc
	)			const

Same as above.

Convenience method for the unsigned char datatype.

const void* SoSFImage::getValue	(	SbVec2i32 &	size,
		int &	nc,
		DataType &	dataType
	)			const

const void* SoSFImage::getValue	(	SbVec2s &	size,
		int &	nc,
		DataType &	dataType
	)			const

Returns the pixels in the image as an array of values of type <dataType>.

The size and nc arguments are filled in with the dimensions of the image and the number of components in the image. The number of bytes in the array returned will be size[0]*size[1]*nc*sizeof(<dataType>)*nc.

SbBool SoSFImage::hasSubTextures ( int & numSubTextures )

Returns TRUE if subTextures have been defined or FALSE if none have been defined.

Also returns the number of subTextures defined.

SbBool SoSFImage::hasTransparency ( ) const

Returns TRUE if the image contains any transparent pixels.

Specifically if the image has 2 or 4 components and at least one pixel has an alpha value less then 255.

SbBool SoSFImage::isNeverWrite ( ) [inline]

Queries the "neverWrite" flag.

int SoSFImage::operator!= ( const SoSFImage & f ) const [inline]

Inequality test.

Reimplemented from SoField.

const SoSFImage& SoSFImage::operator= ( const SoSFImage & f )

Copy from another field of same type.

int SoSFImage::operator== ( const SoSFImage & f ) const

Equality test.

Reimplemented from SoField.

void SoSFImage::setNeverWrite ( SbBool neverWrite )

Sets the "neverWrite" flag.

As this field may have to handle large amounts of data and its representation in an .iv file is not very efficient, it is often a good idea not to allow that data to be written out when required by a write action. By default, the "neverWrite" condition is FALSE.

void SoSFImage::setSubValue	(	const SbVec2i32 &	subSize,
		const SbVec2i32 &	offset,
		unsigned char *	bytes
	)

void SoSFImage::setSubValue	(	const SbVec2s &	subSize,
		const SbVec2s &	offset,
		unsigned char *	bytes
	)

Same as above.

Convenience method for the unsigned char datatype.

void SoSFImage::setSubValue	(	const SbVec2i32 &	subSize,
		const SbVec2i32 &	offset,
		void *	data
	)

void SoSFImage::setSubValue	(	const SbVec2s &	subSize,
		const SbVec2s &	offset,
		void *	data
	)

This method can be used for subtexturing.

Instead of replacing the texture in texture memory, only parts of it are replaced. This is much faster and uses less memory. In any case this method affects the texture in processor memory. Note that the sub-image must have the same number of components as the one contained in this object. The texture in texture memory will not actually be modified until the next render traversal. See also startEditing(), finishEditing().

void SoSFImage::setSubValues	(	const SbVec2i32 *	subSizes,
		const SbVec2i32 *	offsets,
		int	num,
		unsigned char **	subBytes
	)

void SoSFImage::setSubValues	(	const SbVec2s *	subSizes,
		const SbVec2s *	offsets,
		int	num,
		unsigned char **	subBytes
	)

Same as above.

Convenience method for the unsigned char datatype.

void SoSFImage::setSubValues	(	const SbVec2i32 *	subSizes,
		const SbVec2i32 *	offsets,
		int	num,
		void **	data
	)

void SoSFImage::setSubValues	(	const SbVec2s *	subSizes,
		const SbVec2s *	offsets,
		int	num,
		void **	data
	)

This method can be used for subtexturing.

Instead of replacing the texture in texture memory, only parts of it are replaced. This is much faster and uses less memory. In any case this method affects the texture in processor memory. Note that the sub-images must have the same number of components as the one contained in this object. The texture in texture memory will not actually be modified until the next render traversal. See also startEditing(), finishEditing().

void SoSFImage::setValue	(	const SbVec2i32 &	size,
		int	nc,
		const unsigned char *	bytes,
		CopyPolicy	copy = `COPY`
	)

void SoSFImage::setValue	(	const SbVec2s &	size,
		int	nc,
		const unsigned char *	bytes,
		CopyPolicy	copy = `COPY`
	)

Same as above.

Convenience method for the unsigned char datatype.

void SoSFImage::setValue	(	const SbVec2i32 &	size,
		int	nc,
		DataType	dataType,
		SoBufferObject *	bufferObject,
		CopyPolicy	copy = `COPY`
	)

void SoSFImage::setValue	(	const SbVec2i32 &	size,
		int	nc,
		DataType	dataType,
		const void *	data,
		CopyPolicy	copy = `COPY`
	)

void SoSFImage::setValue	(	const SbVec2s &	size,
		int	nc,
		DataType	dataType,
		SoBufferObject *	bufferObject,
		CopyPolicy	copy = `COPY`
	)

void SoSFImage::setValue	(	const SbVec2s &	size,
		int	nc,
		DataType	dataType,
		const void *	data,
		CopyPolicy	copy = `COPY`
	)

Sets the value of this field to be an image of the given size, with the given number of components, and with the given pixel values.

size[0]*sizeof(<dataType>)*size[1]*sizeof(<dataType>)*nc bytes from the given array will be copied into internal storage maintained by the SoSFImage field.

At times, SoSFImage may need to manipulate large amounts of memory. Therefore, it is useful to be able to specify the memory usage policy dynamically. By default, the memory policy is COPY, which is consistent with other Open Inventor fields. The most likely to be efficient is NO_COPY. See also setNeverWrite().

unsigned char* SoSFImage::startEditing	(	SbVec2i32 &	size,
		int &	nc
	)

unsigned char* SoSFImage::startEditing	(	SbVec2s &	size,
		int &	nc
	)

Same as above.

Convenience method for the unsigned char datatype.

void* SoSFImage::startEditing	(	SbVec2i32 &	size,
		int &	nc,
		DataType &	dataType
	)

void* SoSFImage::startEditing	(	SbVec2s &	size,
		int &	nc,
		DataType &	dataType
	)

This method (along with finishEditing()) can be used to efficiently edit the values in an image field.

It returns the size of the image in the size and nc arguments; writing past the end of the array returned is a good way to cause hard-to-find core dumps.

Calling this method is the same as doing a call to setSubValues on the whole texture. The getSubTexture will return one more updated regions when called after finishEditing.

SbRasterImage* SoSFImage::toRasterImage ( bool downSample = true ) const

Returns an instance of SbRasterImage filled with the content of this field.

It is useful to save the result of an SoRenderToTexture operation in feedback mode. The caller is responsible of the release of the returned raster image.

When the content is not of type UNSIGNED_BYTE the data is downsampled to UNSIGNED_BYTE unless the downSample parameter is set to false.

Returns NULL if the content cannot be converted to an SbRasterImage.

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

Inventor/fields/SoSFImage.h

SoSFImage Class Reference [Fields]

Public Types

Public Member Functions

Static Public Member Functions

Detailed Description

SEE ALSO

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

SoSFImage Class Reference
[Fields]