DD::Image::ViewerCache Class Reference

Image cache for the viewer. More...

Classes
struct	LineEnds

Public Types
enum	StartType {   START_PAUSED, START_NEVER, START_PLAYBACK, START_IF_NO_IMAGE,   START_CONTEXT }

Public Member Functions
void	preload (DD::Image::Hash viewer_hash)
virtual void	read_from_cache (DD::Image::Hash viewer_hash, StartType what)
virtual void	write_to_cache (DD::Image::Hash hash)
void	deallocateAll ()
bool	lineDone (int y) const
const DD::Image::Box &	get_roi () const

Static Public Member Functions
static DD::Image::Hash	MakeFileHash (DD::Image::Hash hash, int scale, DD::Image::ChannelSet channels)
static void	InitCache ()
static bool	BoxPresent (const DD::Image::Hash &hash, const DD::Image::Box &box, int downrez_y)

Protected Member Functions
void	allocateLine (int y)
void	deallocateLine (int y)
virtual double	pixelAspect () const =0
virtual DD::Image::Box	bbox () const =0
virtual void	updateBBox (DD::Image::Box newBBox)
virtual void	readFromCacheDone (bool failed, bool allDone, bool skippedStuff)
virtual void	updateFrameRange (int first, int last)
void	setFrameRange (int first, int last)

Protected Attributes
AccountedVector< U32 * >	lineBuffers
	Array of line pointers.
AccountedVector< LineEnds >	lineEnds
	Array of left/right ends.
int	alloc_w
int	alloc_h
	Size of image buffer.
int	width
int	height
	Size we are using.
bool	one_block
	Indicates a single allocation of line data.
DD::Image::Box	roi
	BBox of area to calculate.
int	viewer_downrez_y
	Viewer downrez factor (integer of 1/yzoom)
int	processing_downrez_y
	Processing downrez factor. Either the same as viewer_downrez_y or 1, if we're in full frame mode (processing all scanlines regardless of zoom level)
bool	userRoiEnable
	True if user enabled roi.
DD::Image::Box	userRoi
	Roi selected by user.
bool	image_done_
	All visible lines are up to date.
bool	look_in_cache
	False if we know there is nothing useful in cache file.
int	scale_
	Size of each channel of a pixel in image buffer.

Static Protected Attributes
static int	sAllocFudge

Detailed Description

Image cache for the viewer.

Member Function Documentation

void ViewerCache::preload

(

DD::Image::Hash

viewer_hash

)

Read into the memory cache (but don't try and actually load lines out of this file)

References DD::Image::Image_Cache::mainCache().

void ViewerCache::read_from_cache ( DD::Image::Hash  viewer_hash, StartType  what  )

virtual

Update the viewer from the cache file. Turn on image_done_ if all the visible data has been updated.

References DD::Image::ImageCacheReadI::close(), height, image_done_, lineBuffers, lineEnds, look_in_cache, DD::Image::Image_Cache::mainCache(), one_block, DD::Image::Image_Cache::open(), processing_downrez_y, DD::Image::Box::r(), DD::Image::ImageCacheReadI::read(), DD::Image::Image_Cache::remove(), roi, scale_, DD::Image::ImageCacheReadI::seekRelative(), DD::Image::Box::t(), userRoi, userRoiEnable, DD::Image::Box::x(), and DD::Image::Box::y().

bool ViewerCache::BoxPresent ( const DD::Image::Hash &  hash, const DD::Image::Box &  box, int  downrez_y  )

static

Is the given box present in the memory cache for the viewer cache file identified by /hash/

Only lines required for the passed-in downrez will be considered.

References DD::Image::ImageCacheReadI::close(), DD::Image::Image_Cache::mainCache(), DD::Image::Image_Cache::open(), and DD::Image::ImageCacheReadI::uniqueID().