Okular::TileNode Class Reference

#include <tilesmanager_p.h>

Public Member Functions
	TileNode ()
bool	isValid () const

Public Attributes
bool	dirty
double	distance
int	nTiles
TileNode *	parent
QPixmap *	pixmap
NormalizedRect	rect
Rotation	rotation
TileNode *	tiles

Detailed Description

Node in the quadtree structure used by the tiles manager to store tiles.

Except for the first level, the tiles manager stores tiles in a quadtree structure. Each node stores the pixmap of a tile and its location on the page. There's a limit on the size of the pixmaps (TILES_MAXSIZE, defined in tilesmanager.cpp), and tiles that are bigger than that value are split into four children tiles, which are stored as children of the original tile. If children tiles are still too big, they are recursively split again. If the zoom level changes and a big tile goes below the limit, it is merged back into a leaf tile.

Definition at line 34 of file tilesmanager_p.h.

Constructor & Destructor Documentation

TileNode::TileNode

(

)

Definition at line 631 of file tilesmanager.cpp.

Member Function Documentation

bool TileNode::isValid

(

)

const

Definition at line 642 of file tilesmanager.cpp.

Member Data Documentation

bool Okular::TileNode::dirty

Whether the tile needs to be repainted (after a zoom or rotation) If a tile doesn't have a pixmap but all its children are updated (dirty = false), the parent tile is also considered updated.

Definition at line 70 of file tilesmanager_p.h.

double Okular::TileNode::distance

Distance between the tile and the viewport.

This is used by the evicting algorithm.

Definition at line 76 of file tilesmanager_p.h.

int Okular::TileNode::nTiles

Definition at line 84 of file tilesmanager_p.h.

TileNode* Okular::TileNode::parent

Definition at line 85 of file tilesmanager_p.h.

QPixmap* Okular::TileNode::pixmap

Associated pixmap or NULL if not present.

For each node, it is guaranteed that there's no more than one pixmap along the path from the root to the node itself. In fact, it is very frequent that a leaf node has no pixmap and one of its ancestors has. Such a situation shows, for example, when the parent tile still has a dirty tile from a previous lower zoom level.

Definition at line 55 of file tilesmanager_p.h.

NormalizedRect Okular::TileNode::rect

Location on the page in normalized coords.

Definition at line 44 of file tilesmanager_p.h.

Rotation Okular::TileNode::rotation

Rotation of this individual tile.

A rotation to the page does not immediately rotates the pixmaps in cache. This operation happens when pixmaps are going to be used.

Definition at line 63 of file tilesmanager_p.h.

TileNode* Okular::TileNode::tiles

Children tiles When a tile is split into multiple tiles, they're added as children.

nTiles can be either 0 (in leaf tiles) or 4 (in split tiles).

Definition at line 83 of file tilesmanager_p.h.

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The documentation for this class was generated from the following files:

• tilesmanager_p.h
• tilesmanager.cpp