The SoSFImage class is used to store pixel images.The SoSFImage class provides storage for inline 2D image maps. Images in Coin are mainly used for texture mapping support. More...

#include <Inventor/fields/SoSFImage.h>

Inheritance diagram for SoSFImage:

Public Types
enum	CopyPolicy { COPY, NO_COPY, NO_COPY_AND_DELETE, NO_COPY_AND_FREE }

Public Types inherited from SoField
enum	FieldType { NORMAL_FIELD = 0, EVENTIN_FIELD, EVENTOUT_FIELD, EXPOSED_FIELD }

Public Member Functions
virtual SoType	getTypeId (void) const

virtual void	copyFrom (const SoField &field)

const SoSFImage &	operator= (const SoSFImage &field)

virtual SbBool	isSame (const SoField &field) const

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

const SbImage &	getValue () const

void	setValue (const SbVec2s &size, const int nc, const unsigned char *pixels, CopyPolicy copypolicy=COPY)

int	operator== (const SoSFImage &field) const

int	operator!= (const SoSFImage &field) const

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

void	finishEditing (void)

void	setSubValue (const SbVec2s &dims, const SbVec2s &offset, unsigned char *pixels)

void	setSubValues (const SbVec2s dims, const SbVec2s offsets, int num, unsigned char **pixelblocks)

unsigned char *	getSubTexture (int idx, SbVec2s &dims, SbVec2s &offset) const

SbBool	hasSubTextures (int &numsubtextures)

void	setNeverWrite (SbBool flag)

SbBool	isNeverWrite (void) const

SbBool	hasTransparency (void) const

Public Member Functions inherited from SoSField
virtual	~SoSField ()

Public Member Functions inherited from SoField
virtual	~SoField ()

void	setIgnored (SbBool ignore)

SbBool	isIgnored (void) const

void	setDefault (SbBool defaultVal)

SbBool	isDefault (void) const

SbBool	isOfType (const SoType type) const

void	enableConnection (SbBool flag)

SbBool	isConnectionEnabled (void) const

SbBool	connectFrom (SoEngineOutput *master, SbBool notnotify=FALSE, SbBool append=FALSE)

SbBool	appendConnection (SoEngineOutput *master, SbBool notnotify=FALSE)

void	disconnect (SoEngineOutput *engineoutput)

SbBool	isConnectedFromEngine (void) const

SbBool	getConnectedEngine (SoEngineOutput *&master) const

SbBool	connectFrom (SoField *master, SbBool notnotify=FALSE, SbBool append=FALSE)

SbBool	appendConnection (SoField *master, SbBool notnotify=FALSE)

void	disconnect (SoField *field)

SbBool	isConnectedFromField (void) const

SbBool	getConnectedField (SoField *&master) const

int	getNumConnections (void) const

int	getForwardConnections (SoFieldList &slavelist) const

int	getConnections (SoFieldList &masterlist) const

void	disconnect (void)

SbBool	isConnected (void) const

void	setContainer (SoFieldContainer *cont)

SoFieldContainer *	getContainer (void) const

SbBool	set (const char *valuestring)

void	get (SbString &valuestring)

SbBool	shouldWrite (void) const

virtual void	touch (void)

virtual void	startNotify (void)

virtual void	notify (SoNotList *nlist)

SbBool	enableNotify (SbBool on)

SbBool	isNotifyEnabled (void) const

void	addAuditor (void *f, SoNotRec::Type type)

void	removeAuditor (void *f, SoNotRec::Type type)

int	operator== (const SoField &f) const

int	operator!= (const SoField &f) const

virtual void	connectionStatusChanged (int numconnections)

SbBool	isReadOnly (void) const

virtual void	fixCopy (SbBool copyconnections)

virtual SbBool	referencesCopy (void) const

void	copyConnection (const SoField *fromfield)

virtual SbBool	read (SoInput *input, const SbName &name)

virtual void	write (SoOutput *out, const SbName &name) const

virtual void	countWriteRefs (SoOutput *out) const

void	setFieldType (int type)

int	getFieldType (void) const

SbBool	getDirty (void) const

void	setDirty (SbBool dirty)

void	evaluate (void) const

Static Public Member Functions
static void *	createInstance (void)

static SoType	getClassTypeId (void)

static void	initClass (void)

Static Public Member Functions inherited from SoSField
static void	initClass (void)

static SoType	getClassTypeId (void)

static void	atexit_cleanup (void)

Static Public Member Functions inherited from SoField
static void	initClass (void)

static void	initClasses (void)

static void	cleanupClass (void)

static SoType	getClassTypeId (void)

Additional Inherited Members
Protected Member Functions inherited from SoSField
	SoSField (void)

Protected Member Functions inherited from SoField
	SoField (void)

void	valueChanged (SbBool resetdefault=TRUE)

virtual void	evaluateConnection (void) const

virtual SbBool	readConnection (SoInput *in)

virtual void	writeConnection (SoOutput *out) const

SbBool	isDestructing (void) const

virtual SoNotRec	createNotRec (SoBase *cont)

Detailed Description

The SoSFImage class is used to store pixel images.

The SoSFImage class provides storage for inline 2D image maps. Images in Coin are mainly used for texture mapping support.

SoSFImage instances can be exported and imported as any other field class in Coin.

The components of an SoSFImage is: its image dimensions (width and height), the number of bytes used for describing each pixel (number of components) and an associated pixel buffer. The size of the pixel buffer will be width*height*components.

For texture maps, the components / bytes-per-pixel setting translates as follows: use 1 for a grayscale imagemap, 2 for grayscale + opacity (i.e. alpha value), 3 for RGB (1 byte each for red, green and blue) and 4 components means 3 bytes for RGB + 1 byte opacity value (aka RGBA).

This field is serializable into the Inventor / Coin file format in the following manner:

FIELDNAME X Y C 0xRRGGBBAA 0xRRGGBBAA ...

"X" and "Y" are the image dimensions along the given axes, "C" is the number of components in the image. The number of 0xRRGGBBAA pixel color specifications needs to equal the exact number of pixels, which of course is given by X*Y. Each part of the pixel color value is in the range 0x00 to 0xff (hexadecimal, 0 to 255 decimal).

For 3-component images, the pixel-format is 0xXXRRGGBB, where the byte in the pixel color value marked as "XX" is ignored and can be left out.

For 2-component images, the pixel-format is 0xXXXXGGAA, where the bytes in the pixel color values marked as "XX" are ignored and can be left out. "GG" is the part which gives a grayscale value and "AA" is for opacity.

For 1-component images, the pixel-format is 0xXXXXXXGG, where the bytes in the pixel color values marked as "XX" are ignored and can be left out.

The pixels are read as being ordered in rows along X (width) and columns along Y (height, bottom to top).

Here's a simple example of the file format serialization, for a 2x2 RGB-image inside an SoTexture2 node, as mapped onto an SoCube:

Complexity { textureQuality 0.1 }   # set low to avoid smoothing
Texture2 {
   image 2 2 4
   0xffffffff 0x00ff0088   # white   semi-transparent green
   0xff0000ff 0xffff00ff   #  red    yellow
}
Cube { }

The mini-scenegraph above results in the following mapping on the cube:

The cube has only been slightly rotated, so as you can see from the snapshot, the Y-rows are mapped from bottom to top, while the X-column pixels are mapped onto the cube from left to right.

See also: SoTexture2, SoSFImage3

Member Function Documentation

SoType SoSFImage::getTypeId ( void ) const

virtual

Returns the type identification instance which uniquely identifies the Coin field class the object belongs to.

See also: getClassTypeId(), SoType

Implements SoField.

void SoSFImage::copyFrom ( const SoField & f )

virtual

Copy value(s) from f into this field. f must be of the same type as this field.

Implements SoField.

SbBool SoSFImage::isSame ( const SoField & f ) const

virtual

Check for equal type and value(s).

Implements SoField.

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

Return pixel buffer, set size to contain the image dimensions and nc to the number of components in the image.

const SbImage & SoSFImage::getValue ( void ) const

Return values

SbImage contained by this SoSFImage

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

Initialize this field to size and nc.

If pixels is not NULL, the image data is copied from pixels into this field. If pixels is NULL, the image data is cleared by setting all bytes to 0 (note that the behavior on passing a NULL pointer is specific for Coin, Open Inventor will crash if you try it).

The image dimensions is given by the size argument, and the nc argument specifies the number of bytes-pr-pixel. A 24-bit RGB image would for instance have an nc equal to 3.

The copypolicy argument makes it possible to share image data with SoSFImage without the data being copied (thereby using less memory resources). The default is to copy image data from the pixels source into an internal copy.

Important note: if you call this with copypolicy as either NO_COPY_AND_DELETE or NO_COPY_AND_FREE, and your application is running on Mirosoft Windows, be aware that you will get mysterious crashes if your application is not using the same C library run-time as the Coin library.

The cause of this is that a memory block would then be allocated by the application on the memory heap of one C library run-time (say, for instance MSVCRT.LIB), but attempted deallocated in the memory heap of another C library run-time (e.g. MSVCRTD.LIB), which typically leads to hard-to-debug crashes.

Since: The CopyPolicy argument was added in Coin 2.0.; CopyPolicy was added to TGS Inventor 3.0.

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

Compare image of field with the image in this field and return TRUE if they are equal.

int SoSFImage::operator!= ( const SoSFImage & field ) const

inline

Compare image of field with the image in this field and return FALSE if they are equal.

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

Return pixel buffer. Return the image size and components in size and nc.

You can not use this method to set a new image size. Use setValue() to change the size of the image buffer.

The field's container will not be notified about the changes until you call finishEditing().

void SoSFImage::finishEditing ( void )

Notify the field's auditors that the image data has been modified.

void SoSFImage::setSubValue	(	const SbVec2s &	dims,
		const SbVec2s &	offset,
		unsigned char *	pixels
	)

Not yet implemented for Coin. Get in touch if you need this method.

Since: Coin 2.0; TGS Inventor 3.0

void SoSFImage::setSubValues	(	const SbVec2s *	dims,
		const SbVec2s *	offsets,
		int	num,
		unsigned char **	pixelblocks
	)

Not yet implemented for Coin. Get in touch if you need this method.

Since: Coin 2.0; TGS Inventor 3.0

unsigned char * SoSFImage::getSubTexture	(	int	idx,
		SbVec2s &	dims,
		SbVec2s &	offset
	)		const

Not yet implemented for Coin. Get in touch if you need this method.

Since: Coin 2.0; TGS Inventor 3.0

SbBool SoSFImage::hasSubTextures ( int & numsubtextures )

Returns whether or not sub textures was set up for this field.

If TRUE is returned, the numsubtextures argument will be set to the number of sub textures in this image. This number can be used for iterating over all textures with the SoSFImage::getSubTextures() method.

Since: Coin 2.0; TGS Inventor 3.0

void SoSFImage::setNeverWrite ( SbBool flag )

Set this flag to true to avoid writing out the texture to file. This can save a lot on file size.

Default value is FALSE (i.e. write texture data to file.)

(Note: yet unimplemented for Coin.)

Since: Coin 2.0; TGS Inventor ?.?

SbBool SoSFImage::isNeverWrite ( void ) const

Returns value of "never write texture data" flag.

See also: SoSFImage::setNeverWrite()

Since: Coin 2.0; TGS Inventor ?.?

SbBool SoSFImage::hasTransparency ( void ) const

Returns TRUE if at least one pixel of the image in this field is not completely opaque, otherwise FALSE.

Since: Coin 2.0; TGS Inventor ?.?

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

SoSFImage.h
SoSFImage.cpp

Public Types

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation