mayhem-firmware/firmware/common/ui.hpp

/*
 * Copyright (C) 2014 Jared Boone, ShareBrained Technology, Inc.
 *
 * This file is part of PortaPack.
 *
 * 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, 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; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#ifndef __UI_H__
#define __UI_H__

#include <cstdint>

namespace ui {

using Coord = int16_t;
using Dim = int16_t;

struct Color {
	uint16_t v;

	constexpr Color(
	) : v { 0 }
	{
	}
/*
	explicit constexpr Color(
		const uint32_t value
	) : v { static_cast<uint16_t>(value) }
	{
	}
*/
	constexpr Color(
		uint8_t r,
		uint8_t g,
		uint8_t b
	) : v {
		static_cast<uint16_t>(
			  ((r & 0xf8) << 8)
			| ((g & 0xfc) << 3)
			| ((b & 0xf8) >> 3)
		)}
	{
	}

	static constexpr Color black() {
		return {   0,   0,   0 };
	}

	static constexpr Color red() {
		return { 255,   0,   0 };
	}

	static constexpr Color yellow() {
		return { 255, 255,   0 };
	}

	static constexpr Color green() {
		return {   0, 255,   0 };
	}

	static constexpr Color blue() {
		return {   0,   0, 255 };
	}

	static constexpr Color white() {
		return { 255, 255, 255 };
	}
};
#if 0
enum class CardinalDirection : uint8_t {
	West,
	South,
	North,
	East,
};
#endif
struct Point {
	Coord x;
	Coord y;

	constexpr Point(
	) : x { 0 },
		y { 0 }
	{
	}

	constexpr Point(
		Coord x,
		Coord y
	) : x { x },
		y { y }
	{
	}

	Point operator-() const {
		return { static_cast<Coord>(-x), static_cast<Coord>(-y) };
	}

	Point operator+(const Point& p) const {
		return { static_cast<Coord>(x + p.x), static_cast<Coord>(y + p.y) };
	}

	Point operator-(const Point& p) const {
		return { static_cast<Coord>(x - p.x), static_cast<Coord>(y - p.y) };
	}

	Point& operator+=(const Point& p) {
		x += p.x;
		y += p.y;
		return *this;
	}
#if 0
	uint32_t magnitude_squared() const {
		return (x * x) + (y * y);
	}

	CardinalDirection cardinal_direction() const {
		/* TODO: Doesn't handle 0,0 */

		const auto rotated = sloppy_rotate_by_45_degrees();

		if( rotated.x > 0 ) {
			if( rotated.y > 0 ) {
				return CardinalDirection::East;
			} else {
				// y<=0
				return CardinalDirection::North;
			}
		} else {
			// x<=0
			if( rotated.y > 0 ) {
				return CardinalDirection::South;
			} else {
				return CardinalDirection::West;
			}
		}
	}

private:
	Point sloppy_rotate_by_45_degrees() const {
		/* Clockwise rotate (in screen coordinates), with a gain in
		 * magnitude of sqrt(2).
		 */
		return {
			static_cast<Coord>(x - y),
			static_cast<Coord>(x + y)
		};
	}
#endif
};

struct Size {
	Dim w;
	Dim h;

	constexpr Size(
	) : w { 0 },
		h { 0 }
	{
	}

	constexpr Size(
		Dim w,
		Dim h
	) : w { w },
		h { h }
	{
	}

	bool is_empty() const {
		return (w < 1) || (h < 1);
	}
};

struct Rect {
	Point pos;
	Size size;

	constexpr Rect(
	) : pos { },
		size { }
	{
	}

	constexpr Rect(
		Coord x, Coord y,
		Dim w, Dim h
	) : pos { x, y },
		size { w, h }
	{
	}

	constexpr Rect(
		Point pos,
		Size size
	) : pos(pos),
		size(size)
	{
	}

	Coord top() const {
		return pos.y;
	}

	Coord bottom() const {
		return pos.y + size.h;
	}

	Coord left() const {
		return pos.x;
	}

	Coord right() const {
		return pos.x + size.w;
	}

	Dim width() const {
		return size.w;
	}

	Dim height() const {
		return size.h;
	}

	Point center() const {
		return {
			static_cast<Coord>(pos.x + size.w / 2),
			static_cast<Coord>(pos.y + size.h / 2)
		};
	}

	bool is_empty() const {
		return size.is_empty();
	}

	bool contains(const Point p) const;

	Rect intersect(const Rect& o) const;

	Rect operator+(const Point& p) const {
		return { pos + p, size };
	}

	Rect& operator+=(const Rect& p);

	operator bool() const {
		return !size.is_empty();
	}
};

enum class KeyEvent {
	/* Ordinals map to bit positions reported by CPLD */
	Right = 0,
	Left = 1,
	Down = 2,
	Up = 3,
	Select = 4,
};

using EncoderEvent = int32_t;

struct TouchEvent {
	enum class Type : uint32_t {
		Start = 0,
		Move = 1,
		End = 2,
	};

	Point point;
	Type type;
};

} /* namespace ui */

#endif/*__UI_H__*/