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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Abstraction of the store/snapshot mechanism.
* Copyright (C) 2022 PBS <pbs3141@gmail.com>
* Released under GNU GPL v2+, read the file 'COPYING' for more information.
*/
#ifndef INKSCAPE_UI_WIDGET_CANVAS_STORES_H
#define INKSCAPE_UI_WIDGET_CANVAS_STORES_H
#include "fragment.h"
#include "util.h"
namespace Inkscape {
namespace UI {
namespace Widget {
struct Fragment;
class Prefs;
class Graphics;
class Stores
{
public:
enum class Mode
{
None, /// Not initialised or just reset; no stores exist yet.
Normal, /// Normal mode consisting of just a backing store.
Decoupled /// Decoupled mode consisting of both a backing store and a snapshot store.
};
enum class Action
{
None, /// The backing store was not changed.
Recreated, /// The backing store was completely recreated.
Shifted /// The backing store was shifted into a new rectangle.
};
struct Store : Fragment
{
/**
* The region of space containing drawn content.
* For the snapshot, this region is transformed to store space and approximated inwards.
*/
Cairo::RefPtr<Cairo::Region> drawn;
};
/// Construct a blank object with no stores.
Stores(Prefs const &prefs)
: _mode(Mode::None)
, _graphics(nullptr)
, _prefs(prefs) {}
/// Set the pointer to the graphics object.
void set_graphics(Graphics *g) { _graphics = g; }
/// Discards all stores. (The actual operation on the graphics is performed on the next update().)
void reset();
/// Respond to a viewport change. (Requires a valid graphics.)
Action update(Fragment const &view);
/// Respond to drawing of the backing store having finished. (Requires a valid graphics.)
Action finished_draw(Fragment const &view);
/// Record a rectangle as being drawn to the store.
void mark_drawn(Geom::IntRect const &rect) { _store.drawn->do_union(geom_to_cairo(rect)); }
// Getters.
Store const &store() const { return _store; }
Store const &snapshot() const { return _snapshot; }
Mode mode() const { return _mode; }
private:
// Internal state.
Mode _mode;
Store _store, _snapshot;
// The graphics object that executes the operations on the stores.
Graphics *_graphics;
// The preferences object we read preferences from.
Prefs const &_prefs;
// Internal actions.
Geom::IntRect centered(Fragment const &view) const;
void recreate_store(Fragment const &view);
void shift_store(Fragment const &view);
void take_snapshot(Fragment const &view);
void snapshot_combine(Fragment const &view);
};
} // namespace Widget
} // namespace UI
} // namespace Inkscape
#endif // INKSCAPE_UI_WIDGET_CANVAS_STORES_H
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
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