/*

* Copyright (C) 2014 Vabishchevich Nikolay <vabnick@gmail.com>

*

* This file is part of libass.

*

* Permission to use, copy, modify, and distribute this software for any

* purpose with or without fee is hereby granted, provided that the above

* copyright notice and this permission notice appear in all copies.

*

* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

*/

#ifndef LIBASS_RASTERIZER_H

#define LIBASS_RASTERIZER_H

#include <stddef.h>

#include <stdint.h>

#include <stdbool.h>

#include "ass_bitmap.h"

enum {

SEGFLAG_DN = 1,

SEGFLAG_UL_DR = 2,

SEGFLAG_EXACT_LEFT = 4,

SEGFLAG_EXACT_RIGHT = 8,

SEGFLAG_EXACT_TOP = 16,

SEGFLAG_EXACT_BOTTOM = 32,

};

// Polyline segment struct

struct segment {

};

typedef struct {

int outline_error; // acceptable error (in 1/64 pixel units)

// usable after rasterizer_set_outline

int32_t x_min, x_max, y_min, y_max;

// internal buffers

struct segment *linebuf[2];

size_t size[2], capacity[2];

size_t n_first;

uint8_t *tile;

} RasterizerData;

bool rasterizer_init(RasterizerData *rst, int tile_order, int outline_error);

void rasterizer_done(RasterizerData *rst);

/**

* \brief Convert outline to polyline and calculate exact bounds

* \param path in: source outline

* \param extra in: true if path is second border outline

* \return false on error

*/

bool rasterizer_set_outline(RasterizerData *rst,

const ASS_Outline *path, bool extra);

/**

* \brief Polyline rasterization function

* \param x0, y0, width, height in: source window (full pixel units)

* \param buf out: aligned output buffer (size = stride * height)

* \param stride output buffer stride (aligned)

* \return false on error

* Deletes preprocessed polyline after work.

*/

bool rasterizer_fill(const BitmapEngine *engine, RasterizerData *rst,

uint8_t *buf, int x0, int y0,

int width, int height, ptrdiff_t stride);

#endif /* LIBASS_RASTERIZER_H */