/*

    ......... 2015 Ivan Mahonin

    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 3 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, see <http://www.gnu.org/licenses/>.

*/

#ifndef _SWRENDER_H_

#define _SWRENDER_H_

#include <cstring>

#include "polyspan.h"

class Color {

public:

	typedef float type;

	union {

		struct { type r, g, b, a; };

		struct { type channels[4]; };

	};

	Color(): r(), g(), b(), a() { }

	Color(type r, type g, type b, type a): r(r), g(g), b(b), a(a) { }

	Color(const Color &color, type a): r(color.r), g(color.g), b(color.b), a(color.a*a) { }

};

class Surface {

public:

	const int width, height;

	Color * const data;

	Surface(int width, int height):

		width(width), height(height), data(new Color[width*height])

		{ clear(); }

	~Surface()

		{ delete[] data; }

	void clear() { memset(data, 0, count()*sizeof(Color)); }

	int count() const { return width*height; }

	int data_size() const { return count()*sizeof(Color); }

	Color* operator[] (int row) { return data + row*width; }

	const Color* operator[] (int row) const { return data + row*width; }

};

class SwRender {

public:

	static void fill(

		Surface &target,

		const Color &color );

	static void fill(

		Surface &target,

		const Color &color,

		int left,

		int top,

		int width,

		int height );

	static void row(

		Surface &target,

		const Color &color,

		int left,

		int top,

		int length );

	static void row_alpha(

		Surface &target,

		const Color &color,

		Color::type alpha,

		int left,

		int top,

		int length );

	static void polyspan(

		Surface &target,

		const Polyspan &polyspan,

		const Color &color,

		bool evenodd,

		bool invert );

};

#endif