/*
 * This file is part of Libsvgtiny
 * Licensed under the MIT License,
 *                http://opensource.org/licenses/mit-license.php
 * Copyright 2008 James Bursa <james@semichrome.net>
 */

#ifndef SVGTINY_INTERNAL_H
#define SVGTINY_INTERNAL_H

#include <stdbool.h>

#include <dom/dom.h>
#include <libcss/libcss.h>

#ifndef UNUSED
#define UNUSED(x) ((void) (x))
#endif

struct svgtiny_gradient_stop {
	float offset;
	svgtiny_colour color;
};

#define svgtiny_MAX_STOPS 10
#define svgtiny_LINEAR_GRADIENT 0x2000000

struct svgtiny_parse_state_gradient {
	unsigned int linear_gradient_stop_count;
	dom_string *gradient_x1, *gradient_y1, *gradient_x2, *gradient_y2;
	struct svgtiny_gradient_stop gradient_stop[svgtiny_MAX_STOPS];
	bool gradient_user_space_on_use;
	struct {
		float a, b, c, d, e, f;
	} gradient_transform;
};

struct svgtiny_parse_state {
	struct svgtiny_diagram *diagram;
	dom_document *document;

	float viewport_width;
	float viewport_height;

	/* current transformation matrix */
	struct {
		float a, b, c, d, e, f;
	} ctm;

	/* A libcss context to hold any stylesheets that are present
	 * in the SVG document. This should be pre-populated rather
	 * than on-the-fly, because, for example, a <style> sheet at
	 * the end of the document should affect the SVG elements that
	 * precede it. */
	css_select_ctx *select_ctx;

	/* paint attributes */
	svgtiny_colour fill;
	svgtiny_colour stroke;
	int stroke_width;

	/* gradients */
	struct svgtiny_parse_state_gradient fill_grad;
	struct svgtiny_parse_state_gradient stroke_grad;

	/* Interned strings */
#define SVGTINY_STRING_ACTION2(n,nn) dom_string *interned_##n;
#include "svgtiny_strings.h"
#undef SVGTINY_STRING_ACTION2

	/* Where we store the interned copy of the SVG XML namespace,
	 *
	 *   http://www.w3.org/2000/svg
	 *
	 * We handle it separately it has a different type
	 * (lwc_string) than those above (dom_string).
	 */
	lwc_string *interned_svg_xmlns;
};

struct svgtiny_list;

/* svgtiny.c */
float svgtiny_parse_length(dom_string *s, int viewport_size,
		const struct svgtiny_parse_state state);
void svgtiny_parse_color(dom_string *s, svgtiny_colour *c,
		struct svgtiny_parse_state_gradient *grad,
		struct svgtiny_parse_state *state);
void svgtiny_parse_transform(char *s, float *ma, float *mb,
		float *mc, float *md, float *me, float *mf);
struct svgtiny_shape *svgtiny_add_shape(struct svgtiny_parse_state *state);
void svgtiny_transform_path(float *p, unsigned int n,
		struct svgtiny_parse_state *state);
#if (defined(_GNU_SOURCE) && !defined(__APPLE__) || defined(__amigaos4__) || defined(__HAIKU__) || (defined(_POSIX_C_SOURCE) && ((_POSIX_C_SOURCE - 0) >= 200809L)))
#define HAVE_STRNDUP
#else
#undef HAVE_STRNDUP
char *svgtiny_strndup(const char *s, size_t n);
#define strndup svgtiny_strndup
#endif

/* svgtiny_css.c */
css_error svgtiny_create_stylesheet(css_stylesheet **sheet,
		bool inline_style);

/* svgtiny_gradient.c */
void svgtiny_find_gradient(const char *id,
		struct svgtiny_parse_state_gradient *grad,
		struct svgtiny_parse_state *state);
svgtiny_code svgtiny_add_path_linear_gradient(float *p, unsigned int n,
		struct svgtiny_parse_state *state);

/* svgtiny_list.c */
struct svgtiny_list *svgtiny_list_create(size_t item_size);
unsigned int svgtiny_list_size(struct svgtiny_list *list);
svgtiny_code svgtiny_list_resize(struct svgtiny_list *list,
		unsigned int new_size);
void *svgtiny_list_get(struct svgtiny_list *list,
		unsigned int i);
void *svgtiny_list_push(struct svgtiny_list *list);
void svgtiny_list_free(struct svgtiny_list *list);

#endif