1 files changed, 95 insertions, 0 deletions
diff --git a/libs/surfaces/push2/canvas.h b/libs/surfaces/push2/canvas.h
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+/*
+    Copyright (C) 2016 Paul Davis
+
+    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifndef __ardour_push2_canvas_h__
+#define __ardour_push2_canvas_h__
+
+#include <cairomm/refptr.h>
+#include <glibmm/threads.h>
+
+#include "canvas/canvas.h"
+
+namespace Cairo {
+	class ImageSurface;
+	class Context;
+	class Region;
+}
+
+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 &);
+	bool vblank ();
+
+	void splash ();
+
+	Cairo::RefPtr<Cairo::Context> image_context() { return context; }
+
+	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; }
+
+  private:
+	Push2& p2;
+	int _cols;
+	int _rows;
+
+	static const int pixels_per_row;
+	int pixel_area () const { return _rows * pixels_per_row; }
+
+	uint8_t   frame_header[16];
+	uint16_t* device_frame_buffer;
+
+	Cairo::RefPtr<Cairo::ImageSurface> frame_buffer;
+	Cairo::RefPtr<Cairo::Context> context;
+	Cairo::RefPtr<Cairo::Region> expose_region;
+
+	bool expose ();
+	int blit_to_device_frame_buffer ();
+};
+
+} /* namespace ArdourSurface */
+
+#endif /* __ardour_push2_canvas_h__ */