surfaces/push2/canvas.h

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/*
 * Copyright (C) 2016-2017 Paul Davis <paul@linuxaudiosystems.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#ifndef __ardour_push2_canvas_h__
#define __ardour_push2_canvas_h__
 
#include <cairomm/refptr.h>
 
#include "canvas/canvas.h"
 
namespace Cairo {
        class ImageSurface;
        class Context;
        class Region;
}
 
namespace Pango {
        class Context;
}
 
namespace ArdourSurface {
 
class Push2;
 
/* A canvas which renders to the Push2 display */
 
class Push2Canvas : public ArdourCanvas::Canvas
{
  public:
        Push2Canvas (Push2& p2, int cols, int rows);
        ~Push2Canvas();
 
        void request_redraw ();
        void request_redraw (ArdourCanvas::Rect const &);
        void queue_resize ();
        bool vblank ();
 
        int rows() const { return _rows; }
        int cols() const { return _cols; }
 
        static double inter_button_spacing() { return 120.0; }
 
        ArdourCanvas::Coord width() const { return cols(); }
        ArdourCanvas::Coord height() const { return rows(); }
        void request_size (ArdourCanvas::Duple);
        ArdourCanvas::Rect visible_area () const;
 
        /* API that does nothing since we have no input events */
        void ungrab () {}
        void grab (ArdourCanvas::Item*) {}
        void focus (ArdourCanvas::Item*) {}
        void unfocus (ArdourCanvas::Item*) {}
        void re_enter() {}
        void pick_current_item (int) {}
        void pick_current_item (ArdourCanvas::Duple const &, int) {}
        bool get_mouse_position (ArdourCanvas::Duple&) const { return false; }
 
        Glib::RefPtr<Pango::Context> get_pango_context ();
 
  private:
        Push2& _p2;
        int _cols;
        int _rows;
 
        static const int _pixels_per_row;
 
        int pixel_area () const { return _rows * _pixels_per_row; }
 
        uint8_t   _sample_header[16];
        uint16_t* _device_sample_buffer;
 
        Cairo::RefPtr<Cairo::ImageSurface> _sample_buffer;
        Cairo::RefPtr<Cairo::Context>      _context;
        Cairo::RefPtr<Cairo::Region>       _expose_region;
        Glib::RefPtr<Pango::Context>       _pango_context;
 
        bool expose ();
        int blit_to_device_sample_buffer ();
};
 
} /* namespace ArdourSurface */
 
#endif /* __ardour_push2_canvas_h__ */