DD::Image::IopInfo Class Reference

Inheritance diagram for DD::Image::IopInfo:

Public Types
enum	AccessPreference { eAccessPreferNone, eAccessPreferLinear }
Public Types inherited from DD::Image::Box
typedef iterator	const_iterator

Public Member Functions
ChannelSet &	channels ()
ChannelMask	channels () const
void	channels (ChannelSetInit v)
void	channels (ChannelMask v)
void	channels (Channel v)
void	setAccessPreference (AccessPreference ap)
const AccessPreference &	accessPreference () const
int	ydirection () const
void	ydirection (int v)
bool	black_outside () const
void	black_outside (bool v)
void	turn_on (ChannelSetInit m)
void	turn_on (ChannelMask m)
void	turn_on (Channel c)
void	turn_off (ChannelSetInit m)
void	turn_off (ChannelMask m)
void	turn_off (Channel c)
bool	is_constant () const
void	clipmove (int dx, int dy, int dr, int dt)
void	operator= (const DeepInfo &deepInfo)
	copy over the subset of DeepInfo and IopInfo onto this
Public Member Functions inherited from DD::Image::Info2D
	Info2D ()
void	setFormats (const FormatPair &formats)
FormatPair	formats () const
const Format &	format () const
void	format (const Format &v)
const Format &	full_size_format () const
void	full_size_format (const Format &v)
const DD::Image::Box &	box () const
DD::Image::Box &	box ()
void	setBox (const DD::Image::Box &box)
Public Member Functions inherited from DD::Image::GeneralInfo
int	firstFrame () const
	get the first frame in the range
int	first_frame () const
	get the first frame in the range More...
int	lastFrame () const
	get the last frame in the range
int	last_frame () const
	get the last frame in the range More...
void	setFirstFrame (int v)
	set the first frame in the range
void	setLastFrame (int v)
	set the last frame in the range
void	first_frame (int v)
	set the first frame in the range
void	last_frame (int v)
	set the last frame in the range
void	setFrameRange (FrameRange frameRange)
Public Member Functions inherited from DD::Image::Box
iterator	begin () const
iterator	end () const
	Box (int x, int y, int r, int t)
	Box (const Box &b)
int	x () const
void	x (int v)
int	y () const
void	y (int v)
int	r () const
void	r (int v)
int	t () const
void	t (int v)
int	w () const
void	w (int v)
int	h () const
void	h (int v)
float	center_x () const
float	center_y () const
void	set (int x, int y, int r, int t)
void	set (const Box &b)
bool	is_constant () const
void	clear ()
void	move (int dx, int dy)
void	pad (int dx, int dy, int dr, int dt)
void	pad (int dx, int dy)
void	pad (int d)
int	clampx (int x) const
int	clampy (int y) const
void	merge (const Box &)
void	merge (int x, int y)
void	merge (int x, int y, int r, int t)
void	expand (int amount)
void	expand (int widthAmount, int heightAmount)
void	scale (float scaleAmount)
void	intersect (const Box &)
void	intersect (int x, int y, int r, int t)
bool	intersects (const Box &other) const
bool	intersects (int x, int y, int r, int t) const
bool	contains (const Box &other) const
int	area () const

Detailed Description

This structure contains information that Iop::_validate() must calculate. Because this information is often copied unchanged or with tiny variations from the input operator, it is put into this structure so that it can be copied with a single assignment.

This is a subclass of Box and that provides x,y,r,t values that describe the bounding box around all the interesting pixels (that is, the region of definition). It also provides a merge and intersect operators that are useful when _validate is combining the info from two inputs.

Member Function Documentation

ChannelMask DD::Image::IopInfo::channels ( ) const

inline

Which channels exist in the output of this Iop.

AccessPreference & DD::Image::IopInfo::accessPreference ( ) const

inline

Indicates a preferred access pattern to ask for the lines in. Some operators operate full frame and prefer to be asked for lines from the very top of the request area rather than in the middle.

Operators can call IopInfo::setAccessPreference to set their access preference. eAccessPreferLinear will cause the viewer to ask for lines always from the top or bottom of the request area first, ignoring any user mouse click.

The default is eAccessPreferNone, indicating this operator has no access preference.

Referenced by DD::Image::Iop::merge_info().

int DD::Image::IopInfo::ydirection ( ) const

inline

Indicates a preferred direction to ask for the lines in. Some operators (ie file readers) can produce the lines in one direction much faster, usually because reading line N requires reading all lines from 0..N-1 first. Thus if you go by increasing N the first line is returned immediately, but if you go backwards there is a long delay before the first line is produced. Notice that positive means "up" as line 0 is at the bottom.

Larger numbers indicate how "bad" it is. For sgi files it uses +/- 1 because reading in the wrong direction just means it will do seek() between each line. For jpeg it is -100 because it has to decode all lines above line N.

If your operator flips the picture upsidedown it should negate the y direction, otherwise leave it unchanged. If it reads from several inputs it should add all the ydirections together.

Referenced by DD::Image::Transform::_validate(), DD::Image::Iop::copy_info(), DD::Image::Iop::merge_info(), and DD::Image::Reader::Reader().

bool DD::Image::IopInfo::black_outside ( ) const

inline

True indicates that a 1-pixel border all around the edge of the bounding box is zero in all channels. Operators are expected to set this correctly to match their output.

Many operators can take advantage of this to avoid adding their own black edge and thus avoid increasing the bounding box size.

Referenced by DD::Image::RenderScene::_validate(), DD::Image::DrawIop::_validate(), DD::Image::Transform::_validate(), DD::Image::Black::Black(), DD::Image::Iop::copy_info(), DD::Image::Transform::degenerate(), DD::Image::Iop::merge_info(), DD::Image::Reader::Reader(), and DD::Image::Reader::set_info().

void DD::Image::IopInfo::turn_on ( ChannelMask  m )

inline

Same as channels(turn_on(channels(), m)).

void DD::Image::IopInfo::turn_on ( Channel  c )

inline

Same as channels(turn_on(channels(), c)).

void DD::Image::IopInfo::turn_off ( ChannelMask  m )

inline

Same as channels(turn_off(channels(), m)).

void DD::Image::IopInfo::turn_off ( Channel  c )

inline

Same as channels(turn_off(channels(), c)).

void DD::Image::IopInfo::clipmove	(	int	dx,
		int	dy,
		int	dr,
		int	dt
	)

Expand the bounding box by dx,dy,dr,dt but do not expand it outside the box determined by 0,0,format().width(),format().height() if it is at or inside this. This is used by filter operations, and stops them from expanding their data outside the current format. This clipping is usually what is expected and avoids keeping unnecessary data in the cache buffers, and avoids random-sized caches which fragment memory.

If bounding box is 1 pixel wide in either direction it leaves it unchanged, since this indicates a constant value.