SoSFImage(3) Coin SoSFImage(3) NAME SoSFImage - The SoSFImage class is used to store pixel images. SYNOPSIS #include Inherits SoSField. 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 ... 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-scene graph 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 void * SoSFImage::createInstance (void) [static] This API member is considered internal to the library, as it is not likely to be of interest to the application programmer. Creates a new instance of the class type corresponding to the SoType object. SoType SoSFImage::getClassTypeId (void) [static] This static method returns the SoType object associated with objects of this class. SoType SoSFImage::getTypeId (void) const [virtual] Returns the type identification of an object derived from a class inheriting SoField. This is used for runtime type checking and 'downward' casting. 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. void SoSFImage::initClass (void) [static] Internal method called upon initialization of the library (from SoDB::init()) to set up the type system. 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 () 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 Microsoft Windows, be aware that you will get mysterious crashes if your application is not using the same C library runtime 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 runtime (say, for instance MSVCRT.LIB), but attempted deallocated in the memory heap of another C library runtime (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 cannot 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 have 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 ?.? Author Generated automatically by Doxygen for Coin from the source code. Version 4.0.2 Tue Dec 26 2023 17:59:22 SoSFImage(3)