/*
    Copyright (C) 2012-2016 Carl Hetherington <cth@carlh.net>

    This file is part of DCP-o-matic.

    DCP-o-matic 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.

    DCP-o-matic 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 DCP-o-matic.  If not, see <http://www.gnu.org/licenses/>.

*/

/** @file src/image.h
 *  @brief A set of classes to describe video images.
 */

#ifndef DCPOMATIC_IMAGE_H
#define DCPOMATIC_IMAGE_H


#include "crop.h"
#include "position.h"
#include "position_image.h"
#include "video_range.h"
extern "C" {
#include <libavutil/pixfmt.h>
}
#include <dcp/array_data.h>
#include <dcp/colour_conversion.h>


struct AVFrame;
class Socket;


class Image : public std::enable_shared_from_this<Image>
{
public:
	enum class Alignment {
		COMPACT,
		PADDED
	};

	Image(AVPixelFormat p, dcp::Size s, Alignment alignment);
	explicit Image(AVFrame const *, Alignment alignment);
	explicit Image(Image const &);
	Image(std::shared_ptr<const Image>, Alignment alignment);
	Image& operator=(Image const &);
	~Image();

	uint8_t * const * data() const;
	/** @return array of sizes of the data in each line, in bytes (not including any alignment padding) */
	int const * line_size() const;
	/** @return array of sizes of the data in each line, in bytes (including any alignment padding) */
	int const * stride() const;
	dcp::Size size() const;
	Alignment alignment() const;

	int planes() const;
	int vertical_factor(int) const;
	int horizontal_factor(int) const;
	dcp::Size sample_size(int) const;
	float bytes_per_pixel(int component) const;

	std::shared_ptr<Image> convert_pixel_format(dcp::YUVToRGB yuv_to_rgb, AVPixelFormat out_format, Alignment alignment, bool fast) const;
	std::shared_ptr<Image> scale(dcp::Size out_size, dcp::YUVToRGB yuv_to_rgb, AVPixelFormat out_format, Alignment alignment, bool fast) const;
	std::shared_ptr<Image> crop_scale_window(
		Crop crop,
		dcp::Size inter_size,
		dcp::Size out_size,
		dcp::YUVToRGB yuv_to_rgb,
		VideoRange video_range,
		AVPixelFormat out_format,
		VideoRange out_video_range,
		Alignment alignment,
		bool fast
		) const;

	std::shared_ptr<Image> crop(Crop crop) const;

	void make_black();
	void make_transparent();
	void alpha_blend(std::shared_ptr<const Image> image, Position<int> pos);
	void copy(std::shared_ptr<const Image> image, Position<int> pos);
	void fade(float);

	void read_from_socket(std::shared_ptr<Socket>);
	void write_to_socket(std::shared_ptr<Socket>) const;

	AVPixelFormat pixel_format() const {
		return _pixel_format;
	}

	bool has_alpha() const;

	size_t memory_used() const;

	static std::shared_ptr<const Image> ensure_alignment(std::shared_ptr<const Image> image, Alignment alignment);

private:
	friend struct pixel_formats_test;
	friend struct make_part_black_test;

	void allocate();
	void swap(Image &);
	void make_part_black(int x, int w);
	void yuv_16_black(uint16_t, bool);
	static uint16_t swap_16(uint16_t);
	void video_range_to_full_range();
	std::pair<std::vector<uint8_t*>, dcp::Size> crop_source_pointers(Crop crop) const;

	dcp::Size _size;
	AVPixelFormat _pixel_format; ///< FFmpeg's way of describing the pixel format of this Image
	uint8_t** _data; ///< array of pointers to components
	int* _line_size; ///< array of sizes of the data in each line, in bytes (without any alignment padding bytes)
	int* _stride; ///< array of strides for each line, in bytes (including any alignment padding bytes)
	Alignment _alignment;
};

extern PositionImage merge(std::list<PositionImage> images, Image::Alignment alignment);
extern bool operator==(Image const & a, Image const & b);

#endif