drawing-surface.h

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// SPDX-License-Identifier: GPL-2.0-or-later
 * Authors:
 *   Krzysztof Kosiński <tweenk.pl@gmail.com>
 *
 * Copyright (C) 2011 Authors
 * Released under GNU GPL v2+, read the file 'COPYING' for more information.
 */
 
#ifndef INKSCAPE_DISPLAY_DRAWING_SURFACE_H
#define INKSCAPE_DISPLAY_DRAWING_SURFACE_H
 
#include <cairo.h>
#include <2geom/affine.h>
#include <2geom/rect.h>
#include <2geom/transforms.h>
 
extern "C" {
typedef struct _cairo cairo_t;
typedef struct _cairo_surface cairo_surface_t;
typedef struct _cairo_region cairo_region_t;
}
 
namespace Inkscape {
class DrawingContext;
 
class DrawingSurface
{
public:
    explicit DrawingSurface(Geom::IntRect const &area, int device_scale = 1);
    DrawingSurface(Geom::Rect const &logbox, Geom::IntPoint const &pixdims, int device_scale = 1);
    DrawingSurface(cairo_surface_t *surface, Geom::Point const &origin);
    virtual ~DrawingSurface();
 
    Geom::Rect area() const { return Geom::Rect::from_xywh(_origin, dimensions()); } 
    Geom::IntPoint pixels() const { return _pixels; } 
    Geom::Point dimensions() const { return _pixels / _scale.vector(); } 
    Geom::Point origin() const { return _origin; }
    Geom::Scale scale() const { return _scale; }
    int device_scale() const { return _device_scale; }
    Geom::Affine drawingTransform() const { return Geom::Translate(-_origin) * _scale; } 
    void dropContents();
 
    cairo_surface_t *raw() { return _surface; }
    cairo_t *createRawContext();
 
protected:
    Geom::IntRect pixelArea() const;
 
    cairo_surface_t *_surface;
    Geom::Point _origin;
    Geom::Scale _scale;
    Geom::IntPoint _pixels;
    int _device_scale;
    bool _has_context;
 
    friend class DrawingContext;
};
 
class DrawingCache
    : public DrawingSurface
{
public:
    explicit DrawingCache(Geom::IntRect const &area, int device_scale = 1);
    ~DrawingCache() override;
 
    void markDirty(Geom::IntRect const &area = Geom::IntRect::infinite());
    void markClean(Geom::IntRect const &area = Geom::IntRect::infinite());
    void scheduleTransform(Geom::IntRect const &new_area, Geom::Affine const &trans);
    void prepare();
    void paintFromCache(DrawingContext &dc, Geom::OptIntRect &area, bool is_filter);
 
protected:
    cairo_region_t *_clean_region;
    Geom::IntRect _pending_area;
    Geom::Affine _pending_transform;
 
private:
    void _dumpCache(Geom::OptIntRect const &area);
};
 
} // namespace Inkscape
 
#endif // INKSCAPE_DISPLAY_DRAWING_SURFACE_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:fileencoding=utf-8:textwidth=99 :