SoSFImage3.h

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**=======================================================================*/
/*=======================================================================
** Author      : Patrick Vigneras (Nov 1999)
**=======================================================================*/
 
#ifndef  _SO_SF_IMAGE_3_
#define  _SO_SF_IMAGE_3_
 
#include <Inventor/fields/SoSubField.h>
#include <Inventor/SbLinear.h>
#include <Inventor/SbPList.h>
#include <Inventor/devices/SoBufferObject.h>
#include <Inventor/fields/SoSFImage.h>
 
class SoCpuBufferObject;
 
//
//  SoSFImage3 subclass of SoSField. This field handles 3 dimensional images,
// that is a set of same-type (number of components) and same-size images.
// It is basically useful for 3d texturing (see Inventor/nodes/SoTexture3.h).
// This field uses a lot of memory (a simple 256x256x256 image in
// grayscale already takes 16MB of memory). Therefore, as opposed to the
// other fields, this field provides a way to manage memory and avoid
// useless copies of data. This is essentially done through the CopyPolicy
// enumeration and the set/isNeverWrite methods. The CopyPolicy provides
// four types of memory management:
// COPY is the default and is consistent with all other fields: any buffer
// passed is copied and the memory management is done inside the field;
// NO_COPY only uses a pointer given by the application which remains
// responsible for the memory management;
// NO_COPY_AND_DELETE accepts pointers from the application (ie does not
// copy the buffer) but the field takes responsability for the memory
// management. Note that this case is only intended for buffers
// created with the operator 'new';
// NO_COPY_AND_FREE is essentially the same as above but applies the function
// 'free' on the pointer instead of the operator 'delete'.
// Furthermore, two methods, is/setNeverWrite allow to write or not write
// out the data stored in this field. By default, the 'never write' condition
// is TRUE.
//
 
class  SoSFImage3 : public SoSField {
 
  // Uses only some of the standard field stuff (because there is no
  // SbImage type):
  SO_SFIELD_REQUIRED_HEADER(SoSFImage3);
  SO_SFIELD_CONSTRUCTOR_HEADER(SoSFImage3);
  
public:
 
  enum CopyPolicy {
    COPY = 0,
      NO_COPY = 1,
    NO_COPY_AND_DELETE = 2,
    NO_COPY_AND_FREE = 3
  };
 
  const void* getValue( SbVec3i32& size, int& nc, SoSFImage::DataType& dataType ) const;
 
  const unsigned char* getValue( SbVec3s& size, int& nc ) const;
 
  SoBufferObject* getBufferObject( SbVec3i32& size, int& nc, SoSFImage::DataType& dataType ) const;
 
  SoBufferObject* getBufferObject( SbVec3s& size, int& nc ) const;
 
  void setValue( const SbVec3i32& size, int nc,
                 SoSFImage::DataType dataType,
                 const void* data,
                 CopyPolicy copy = COPY );
 
  void setValue( const SbVec3i32& size, int nc,
                 SoSFImage::DataType dataType,
                 SoBufferObject* bufferObject,
                 CopyPolicy copy = COPY );
 
  void setValue( const SbVec3s &size,
                 int nc,
                 unsigned char *bytes,
                 CopyPolicy copy = COPY );
 
  void setValue( const SbVec3s &size,
                 int nc,
                 SoBufferObject* bufferObject,
                 CopyPolicy copy = COPY );
 
  void setSubValue( const SbVec3i32& subSize,
                    const SbVec3i32& offset,
                    void* bytes,
                    CopyPolicy copy = COPY );
 
  void setSubValue( const SbVec3s& subSize,
                    const SbVec3s& offset,
                    unsigned char* bytes,
                    CopyPolicy copy = COPY );
 
  void setSubValues( const SbVec3i32* subSizes,
                     const SbVec3i32* offsets,
                     int num,
                     void** data,
                     CopyPolicy copy = COPY );
 
  void setSubValues( const SbVec3s* subSizes,
                     const SbVec3s* offsets,
                     int num,
                     unsigned char** bytes,
                     CopyPolicy copy = COPY );
 
  int operator==(const SoSFImage3 &f) const;
  int operator!=(const SoSFImage3 &f) const
  { return ! ((*this) == f); }
 
  void* startEditing( SbVec3i32& size, int& nc, SoSFImage::DataType& dataType );
 
  unsigned char* startEditing( SbVec3s& size, int& nc );
 
  void finishEditing();
 
  void* getSubTexture( int index, SbVec3i32& size, SbVec3i32& offset, SoSFImage::DataType& dataType );
 
  unsigned char* getSubTexture( int index, SbVec3s& size, SbVec3s& offset );
 
  SbBool hasSubTextures(int &numSubTextures);
 
  void setNeverWrite(SbBool neverWrite);
  SbBool isNeverWrite()
  { return m_neverWrite; }
 
 
  SoBufferObject* getBufferObject() const;
 
  int getNumComponents() const;
 
 private:
 
  static void initClass();
  static void exitClass();
  void resetSubTextures();
 
  void deleteBytesArray();
 
  SbBool hasTransparency() const;
 
  void setHasTransparency(SoSFImage::HasTransparency status)
  {
    m_hasTransparencyState = status;
  }
 
private:
 
  // Width, height and depth of image
  SbVec3i32 m_size;
 
  // Number of components per pixel
  int m_numComponents;
 
  unsigned char* m_buffer;
 
  // Buffer object which contains the data.
  SoRef<SoBufferObject> m_bufferObject;
 
  SoRef<SoCpuBufferObject> m_cpuBufferObject;
 
  CopyPolicy m_copyPolicy;
 
  // list of [subSize,offset,bytes,copypolicy]
  SbPList m_subTextures;
 
  SbBool m_neverWrite;
  
  SoSFImage::DataType m_dataType;
 
  SoSFImage::HasTransparency m_hasTransparencyState;
 
  size_t getImageValueSize() const;
 
  // Reading and writing
  virtual SbBool readValue(SoInput *in);
  virtual void writeValue(SoOutput *out) const;
};
 
inline SoBufferObject* 
SoSFImage3::getBufferObject() const
{
  return m_bufferObject.ptr();
}
 
inline int 
SoSFImage3::getNumComponents() const
{
  return m_numComponents;
}
 
#endif /* _SO_SF_IMAGE_3_ */