#ifndef SEEN_INKSCAPE_DISPLAY_DRAWING_ITEM_H

#define SEEN_INKSCAPE_DISPLAY_DRAWING_ITEM_H

#include <list>

#include <exception>

#include <boost/operators.hpp>

#include <boost/utility.hpp>

#include <boost/intrusive/list.hpp>

#include <2geom/rect.h>

#include <2geom/affine.h>

class SPStyle;

namespace Inkscape {

class Drawing;

class DrawingCache;

class DrawingContext;

class DrawingItem;

namespace Filters {

class Filter;

} // namespace Filters

struct UpdateContext {

Geom::Affine ctm;

};

struct CacheRecord

: boost::totally_ordered<CacheRecord>

{

bool operator<(CacheRecord const &other) const { return score < other.score; }

bool operator==(CacheRecord const &other) const { return score == other.score; }

operator DrawingItem *() const { return item; }

double score;

size_t cache_size;

DrawingItem *item;

};

typedef std::list<CacheRecord> CacheList;

class InvalidItemException : public std::exception {

virtual const char *what() const throw() {

return "Invalid item in drawing";

}

};

class DrawingItem

: boost::noncopyable

{

public:

enum RenderFlags {

RENDER_DEFAULT = 0,

RENDER_CACHE_ONLY = 1,

RENDER_BYPASS_CACHE = 2,

RENDER_FILTER_BACKGROUND = 4

};

enum StateFlags {

STATE_NONE = 0,

STATE_BBOX = (1<<0), // bounding boxes are up-to-date

STATE_CACHE = (1<<1), // cache extents and clean area are up-to-date

STATE_PICK = (1<<2), // can process pick requests

STATE_RENDER = (1<<3), // can be rendered

STATE_BACKGROUND = (1<<4), // filter background data is up to date

STATE_ALL = (1<<5)-1

};

enum PickFlags {

PICK_NORMAL = 0, // normal pick

PICK_STICKY = (1<<0), // sticky pick - ignore visibility and sensitivity

PICK_AS_CLIP = (1<<2) // pick with no stroke and opaque fill regardless of item style

};

DrawingItem(Drawing &drawing);

virtual ~DrawingItem();

Geom::OptIntRect geometricBounds() const { return _bbox; }

Geom::OptIntRect visualBounds() const { return _drawbox; }

Geom::OptRect itemBounds() const { return _item_bbox; }

Geom::Affine ctm() const { return _ctm; }

Geom::Affine transform() const { return _transform ? *_transform : Geom::identity(); }

Drawing &drawing() const { return _drawing; }

DrawingItem *parent() const;

bool isAncestorOf(DrawingItem *item) const;

void appendChild(DrawingItem *item);

void prependChild(DrawingItem *item);

void clearChildren();

bool visible() const { return _visible; }

void setVisible(bool v);

bool sensitive() const { return _sensitive; }

void setSensitive(bool v);

bool cached() const { return _cached; }

void setCached(bool c, bool persistent = false);

void setOpacity(float opacity);

void setAntialiasing(bool a);

void setIsolation(unsigned isolation); // CSS Compositing and Blending

void setBlendMode(unsigned blend_mode);

void setTransform(Geom::Affine const &trans);

void setClip(DrawingItem *item);

void setMask(DrawingItem *item);

void setZOrder(unsigned z);

void setItemBounds(Geom::OptRect const &bounds);

void setFilterBounds(Geom::OptRect const &bounds);

void setKey(unsigned key) { _key = key; }

unsigned key() const { return _key; }

void setData(void *data) { _user_data = data; }

void *data() const { return _user_data; }

void update(Geom::IntRect const &area = Geom::IntRect::infinite(), UpdateContext const &ctx = UpdateContext(), unsigned flags = STATE_ALL, unsigned reset = 0);

unsigned render(DrawingContext &dc, Geom::IntRect const &area, unsigned flags = 0, DrawingItem *stop_at = NULL);

void clip(DrawingContext &dc, Geom::IntRect const &area);

DrawingItem *pick(Geom::Point const &p, double delta, unsigned flags = 0);

protected:

enum ChildType {

CHILD_ORPHAN = 0, // no parent - implies _parent == NULL

CHILD_NORMAL = 1, // contained in _children of parent

CHILD_CLIP = 2, // referenced by _clip member of parent

CHILD_MASK = 3, // referenced by _mask member of parent

CHILD_ROOT = 4, // root item of _drawing

CHILD_FILL_PATTERN = 5, // not yet implemented: referenced by fill pattern of parent

CHILD_STROKE_PATTERN = 6 // not yet implemented: referenced by stroke pattern of parent

};

enum RenderResult {

RENDER_OK = 0,

RENDER_STOP = 1

};

void _renderOutline(DrawingContext &dc, Geom::IntRect const &area, unsigned flags);

void _markForUpdate(unsigned state, bool propagate);

void _markForRendering();

void _invalidateFilterBackground(Geom::IntRect const &area);

void _setStyleCommon(SPStyle *&_style, SPStyle *style);

double _cacheScore();

Geom::OptIntRect _cacheRect();

virtual unsigned _updateItem(Geom::IntRect const &/*area*/, UpdateContext const &/*ctx*/,

unsigned /*flags*/, unsigned /*reset*/) { return 0; }

virtual unsigned _renderItem(DrawingContext &/*dc*/, Geom::IntRect const &/*area*/, unsigned /*flags*/,

DrawingItem * /*stop_at*/) { return RENDER_OK; }

virtual void _clipItem(DrawingContext &/*dc*/, Geom::IntRect const &/*area*/) {}

virtual DrawingItem *_pickItem(Geom::Point const &/*p*/, double /*delta*/, unsigned /*flags*/) { return NULL; }

virtual bool _canClip() { return false; }

// member variables start here

Drawing &_drawing;

DrawingItem *_parent;

typedef boost::intrusive::list_member_hook<> ListHook;

ListHook _child_hook;

typedef boost::intrusive::list<

DrawingItem,

boost::intrusive::member_hook<DrawingItem, ListHook, &DrawingItem::_child_hook>

> ChildrenList;

ChildrenList _children;

unsigned _key; ///< Some SPItems can have more than one DrawingItem;

/// this value is a hack used to distinguish between them

float _opacity;

Geom::Affine *_transform; ///< Incremental transform from parent to this item's coords

Geom::Affine _ctm; ///< Total transform from item coords to display coords

Geom::OptIntRect _bbox; ///< Bounding box in display (pixel) coords including stroke

Geom::OptIntRect _drawbox; ///< Full visual bounding box - enlarged by filters, shrunk by clips and masks

Geom::OptRect _item_bbox; ///< Geometric bounding box in item's user space.

/// This is used to compute the filter effect region and render in

/// objectBoundingBox units.

DrawingItem *_clip;

DrawingItem *_mask;

Inkscape::Filters::Filter *_filter;

void *_user_data; ///< Used to associate DrawingItems with SPItems that created them

DrawingCache *_cache;

CacheList::iterator _cache_iterator;

unsigned _state : 8;

unsigned _propagate_state : 8;

unsigned _child_type : 3; // see ChildType enum

unsigned _background_new : 1; ///< Whether enable-background: new is set for this element

unsigned _background_accumulate : 1; ///< Whether this element accumulates background

/// (has any ancestor with enable-background: new)

unsigned _visible : 1;

unsigned _sensitive : 1; ///< Whether this item responds to events

unsigned _cached : 1; ///< Whether the rendering is stored for reuse

unsigned _cached_persistent : 1; ///< If set, will always be cached regardless of score

unsigned _has_cache_iterator : 1; ///< If set, _cache_iterator is valid

unsigned _propagate : 1; ///< Whether to call update for all children on next update

//unsigned _renders_opacity : 1; ///< Whether object needs temporary surface for opacity

unsigned _pick_children : 1; ///< For groups: if true, children are returned from pick(),

/// otherwise the group is returned

unsigned _antialias : 1; ///< Whether to use antialiasing

unsigned _isolation : 1;

unsigned _mix_blend_mode : 4;

friend class Drawing;

};

struct DeleteDisposer {

void operator()(DrawingItem *item) { delete item; }

};

} // end namespace Inkscape

#endif // !SEEN_INKSCAPE_DISPLAY_DRAWING_ITEM_H