DD::Image::GeoWriter Class Reference

Inherits DD::Image::FileHandler.

Classes
class	Description
	Specialised GeoWriter Description. More...

Public Member Functions
	GeoWriter (WriteGeo *)
virtual	~GeoWriter ()
virtual void	frame (int)
virtual void	execute (Scene &scene)
virtual bool	animation () const
virtual int	split_input (int i) const
virtual void	finish ()
virtual void	knobs (Knob_Callback cb)
virtual int	knob_changed (Knob *knob)

Protected Member Functions
int	frame () const
GeoOp *	input0 ()
const char *	filename () const
void	status (float amount) const
bool	open ()
bool	close ()
bool	write (const void *, FILE_OFFSET)
bool	write (FILE_OFFSET, const void *, FILE_OFFSET)
bool	seek (FILE_OFFSET)
FILE_OFFSET	tell () const

Protected Attributes
WriteGeo *	geo
	Points at the WriteGeo that created this.
void *	file
	Actually a FILE* but I don't want the <stdio.h> header!
FILE_OFFSET	offset
	Current offset into file.

Friends
class	WriteGeo

Detailed Description

Writes data to a geometry file.

The WriteGeo creates one of these for every different filename it writes. Each different file type is a different subclass. Each subclass defines a Writer_Description object, all of these are searched to figure out what subclass to use.

The implementation of the base class is in WriteGeo.C

Constructor & Destructor Documentation

GeoWriter::GeoWriter

(

WriteGeo *

i

)

This does not open the file. Instead a subclass should call open() as the first statement in execute() and then return if open fails.

References file.

GeoWriter::~GeoWriter ( )

virtual

Destruction closes the temporary file if execute() did not call close().

References file.

Member Function Documentation

int DD::Image::GeoWriter::frame ( ) const

inlineprotected

Frame number to write.

GeoOp* DD::Image::GeoWriter::input0 ( )

inlineprotected

The GeoOp whose output should be written.

const char* DD::Image::GeoWriter::filename ( ) const

inlineprotected

The filename to write.

Referenced by close(), and open().

void DD::Image::GeoWriter::status ( float  amount ) const

inlineprotected

Call status to display percentage of the current frame done.

References DD::Image::Op::progressFraction().

bool GeoWriter::open ( )

protected

Open the output file. This file is created with a temporary name so that the original file is not replaced until the write is successful. This returns false and calls geo->error() if it can't open the file.

References file, filename(), geo, DD::Image::WriteGeo::internalError(), offset, and strlcpy().

bool GeoWriter::close ( )

protected

Close the output file. If there have not been any errors this will mv the temporary file to the correct place.

References DD::Image::Op::aborted(), file, filename(), geo, DD::Image::WriteGeo::internalError(), and strlcpy().

bool GeoWriter::write ( const void *  buf, FILE_OFFSET  length  )

protected

Write length bytes to the file. Call geo->error() on any errors and returns false. Returns true on success.

References file, geo, DD::Image::WriteGeo::internalError(), and offset.

Referenced by write().

bool GeoWriter::write ( FILE_OFFSET  off, const void *  buf, FILE_OFFSET  length  )

protected

Same as "seek(off) && write(buf, length)", this writes length bytes to the file at offset and leaves the pointer after that.

References seek(), and write().

bool GeoWriter::seek ( FILE_OFFSET  off )

protected

Move the write pointer to offset. This is done efficiently if the pointer is already at that point. Calls geo->error() on any errors and returns false. Returns true on success.

References file, geo, DD::Image::WriteGeo::internalError(), and offset.

Referenced by write().

FILE_OFFSET DD::Image::GeoWriter::tell ( ) const

inlineprotected

Returns where the pointer currently is.

void GeoWriter::frame ( int  n )

virtual

Set the frame number to n.

void GeoWriter::execute ( Scene &  scene )

virtual

Write the data in geo->input0(). The frame number may be retrieved with frame() and the filename from filename(). This may call geo->error() with any error messages.

References DD::Image::Op::debug(), and geo.

bool GeoWriter::animation ( ) const

virtual

Return true if the destination can have an animation. If this is true then the writer is capable of writing objects with animation, and frame() and execute() may be called multiple times to write different objects. The default version returns false.

Referenced by DD::Image::WriteGeo::_close(), DD::Image::WriteGeo::endExecuting(), and DD::Image::WriteGeo::execFrameMode().

int GeoWriter::split_input ( int  i ) const

virtual

Lets a writer override the Op::split_input() method of the including WriteGeo op. This is used by Writers that can write more than one view.

Referenced by DD::Image::WriteGeo::execViewMode(), and DD::Image::WriteGeo::split_input().

void GeoWriter::finish ( )

virtual

Override if the writer needs to do something to finish a sequence. This is mostly of use by animation writers that don't close out the destination on a frame-by-frame basis.

Referenced by DD::Image::WriteGeo::endExecuting().

void GeoWriter::knobs ( Knob_Callback  cb )

virtual

Like the Op::knobs() method, this allows the Writers to create format-specific knobs for format-specific parameters. At present, the Writers are tasked with adding the knobs themselves after the 'file_type' knob of the parent Write.

int GeoWriter::knob_changed ( Knob *  knob )

virtual

Like the Op::knob_changed() method, this allows the Writers to handle changes in their own parameters.