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/* cairo - a vector graphics library with display and print output

 *

 * Copyright © 2005 Red Hat, Inc.

 *

 * This library is free software; you can redistribute it and/or

 * modify it either under the terms of the GNU Lesser General Public

 * License version 2.1 as published by the Free Software Foundation

 * (the "LGPL") or, at your option, under the terms of the Mozilla

 * Public License Version 1.1 (the "MPL"). If you do not alter this

 * notice, a recipient may use your version of this file under either

 * the MPL or the LGPL.

 *

 * You should have received a copy of the LGPL along with this library

 * in the file COPYING-LGPL-2.1; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA

 * You should have received a copy of the MPL along with this library

 * in the file COPYING-MPL-1.1

 *

 * The contents of this file are subject to the Mozilla Public License

 * Version 1.1 (the "License"); you may not use this file except in

 * compliance with the License. You may obtain a copy of the License at

 * http://www.mozilla.org/MPL/

 *

 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY

 * OF ANY KIND, either express or implied. See the LGPL or the MPL for

 * the specific language governing rights and limitations.

 *

 * The Original Code is the cairo graphics library.

 *

 * The Initial Developer of the Original Code is Red Hat, Inc.

 *

 * Contributor(s):

 *	Carl D. Worth 

 */

#ifndef CAIRO_PATTERN_PRIVATE_H

#define CAIRO_PATTERN_PRIVATE_H

#include "cairo-error-private.h"

#include "cairo-types-private.h"

#include "cairo-list-private.h"

#include "cairo-surface-private.h"

#include  /* FILE* */

CAIRO_BEGIN_DECLS

typedef struct _cairo_pattern_observer cairo_pattern_observer_t;

enum {

    CAIRO_PATTERN_NOTIFY_MATRIX = 0x1,

    CAIRO_PATTERN_NOTIFY_FILTER = 0x2,

    CAIRO_PATTERN_NOTIFY_EXTEND = 0x4,

    CAIRO_PATTERN_NOTIFY_OPACITY = 0x9,

};

struct _cairo_pattern_observer {

    void (*notify) (cairo_pattern_observer_t *,

		    cairo_pattern_t *pattern,

		    unsigned int flags);

    cairo_list_t link;

};

struct _cairo_pattern {

    cairo_reference_count_t	ref_count;

    cairo_status_t		status;

    cairo_user_data_array_t	user_data;

    cairo_list_t		observers;

    cairo_pattern_type_t	type;

    cairo_filter_t		filter;

    cairo_extend_t		extend;

    cairo_bool_t		has_component_alpha;

    cairo_matrix_t		matrix;

    double			opacity;

};

struct _cairo_solid_pattern {

    cairo_pattern_t base;

    cairo_color_t color;

};

typedef struct _cairo_surface_pattern {

    cairo_pattern_t base;

    cairo_surface_t *surface;

} cairo_surface_pattern_t;

typedef struct _cairo_gradient_stop {

    double offset;

    cairo_color_stop_t color;

} cairo_gradient_stop_t;

typedef struct _cairo_gradient_pattern {

    cairo_pattern_t base;

    unsigned int	    n_stops;

    unsigned int	    stops_size;

    cairo_gradient_stop_t  *stops;

    cairo_gradient_stop_t   stops_embedded[2];

} cairo_gradient_pattern_t;

typedef struct _cairo_linear_pattern {

    cairo_gradient_pattern_t base;

    cairo_point_double_t pd1;

    cairo_point_double_t pd2;

} cairo_linear_pattern_t;

typedef struct _cairo_radial_pattern {

    cairo_gradient_pattern_t base;

    cairo_circle_double_t cd1;

    cairo_circle_double_t cd2;

} cairo_radial_pattern_t;

typedef union {

    cairo_gradient_pattern_t base;

    cairo_linear_pattern_t linear;

    cairo_radial_pattern_t radial;

} cairo_gradient_pattern_union_t;

/*

 * A mesh patch is a tensor-product patch (bicubic Bezier surface

 * patch). It has 16 control points. Each set of 4 points along the

 * sides of the 4x4 grid of control points is a Bezier curve that

 * defines one side of the patch. A color is assigned to each

 * corner. The inner 4 points provide additional control over the

 * shape and the color mapping.

 *

 * Cairo uses the same convention as the PDF Reference for numbering

 * the points and side of the patch.

 *

 *

 *                      Side 1

 *

 *          p[0][3] p[1][3] p[2][3] p[3][3]

 * Side 0   p[0][2] p[1][2] p[2][2] p[3][2]  Side 2

 *          p[0][1] p[1][1] p[2][1] p[3][1]

 *          p[0][0] p[1][0] p[2][0] p[3][0]

 *

 *                      Side 3

 *

 *

 *   Point            Color

 *  -------------------------

 *  points[0][0]    colors[0]

 *  points[0][3]    colors[1]

 *  points[3][3]    colors[2]

 *  points[3][0]    colors[3]

 */

typedef struct _cairo_mesh_patch {

    cairo_point_double_t points[4][4];

    cairo_color_t colors[4];

} cairo_mesh_patch_t;

typedef struct _cairo_mesh_pattern {

    cairo_pattern_t base;

    cairo_array_t patches;

    cairo_mesh_patch_t *current_patch;

    int current_side;

    cairo_bool_t has_control_point[4];

    cairo_bool_t has_color[4];

} cairo_mesh_pattern_t;

typedef struct _cairo_raster_source_pattern {

    cairo_pattern_t base;

    cairo_content_t content;

    cairo_rectangle_int_t extents;

    cairo_raster_source_acquire_func_t acquire;

    cairo_raster_source_release_func_t release;

    cairo_raster_source_snapshot_func_t snapshot;

    cairo_raster_source_copy_func_t copy;

    cairo_raster_source_finish_func_t finish;

    /* an explicit pre-allocated member in preference to the general user-data */

    void *user_data;

} cairo_raster_source_pattern_t;

typedef union {

    cairo_pattern_t		    base;

    cairo_solid_pattern_t	    solid;

    cairo_surface_pattern_t	    surface;

    cairo_gradient_pattern_union_t  gradient;

    cairo_mesh_pattern_t	    mesh;

    cairo_raster_source_pattern_t   raster_source;

} cairo_pattern_union_t;

/* cairo-pattern.c */

cairo_private cairo_pattern_t *

_cairo_pattern_create_in_error (cairo_status_t status);

cairo_private cairo_status_t

_cairo_pattern_create_copy (cairo_pattern_t	  **pattern,

			    const cairo_pattern_t  *other);

cairo_private void

_cairo_pattern_init (cairo_pattern_t *pattern,

		     cairo_pattern_type_t type);

cairo_private cairo_status_t

_cairo_pattern_init_copy (cairo_pattern_t	*pattern,

			  const cairo_pattern_t *other);

cairo_private void

_cairo_pattern_init_static_copy (cairo_pattern_t	*pattern,

				 const cairo_pattern_t *other);

cairo_private cairo_status_t

_cairo_pattern_init_snapshot (cairo_pattern_t       *pattern,

			      const cairo_pattern_t *other);

cairo_private void

_cairo_pattern_init_solid (cairo_solid_pattern_t	*pattern,

			   const cairo_color_t		*color);

cairo_private void

_cairo_pattern_init_for_surface (cairo_surface_pattern_t *pattern,

				 cairo_surface_t *surface);

cairo_private void

_cairo_pattern_fini (cairo_pattern_t *pattern);

cairo_private cairo_pattern_t *

_cairo_pattern_create_solid (const cairo_color_t	*color);

cairo_private void

_cairo_pattern_transform (cairo_pattern_t      *pattern,

			  const cairo_matrix_t *ctm_inverse);

cairo_private cairo_bool_t

_cairo_pattern_is_opaque_solid (const cairo_pattern_t *pattern);

cairo_private cairo_bool_t

_cairo_pattern_is_opaque (const cairo_pattern_t *pattern,

			  const cairo_rectangle_int_t *extents);

cairo_private cairo_bool_t

_cairo_pattern_is_clear (const cairo_pattern_t *pattern);

cairo_private cairo_bool_t

_cairo_gradient_pattern_is_solid (const cairo_gradient_pattern_t *gradient,

				  const cairo_rectangle_int_t *extents,

				  cairo_color_t *color);

cairo_private void

_cairo_gradient_pattern_fit_to_range (const cairo_gradient_pattern_t *gradient,

				      double			      max_value,

				      cairo_matrix_t                 *out_matrix,

				      cairo_circle_double_t	      out_circle[2]);

cairo_private cairo_bool_t

_cairo_radial_pattern_focus_is_inside (const cairo_radial_pattern_t *radial);

cairo_private void

_cairo_gradient_pattern_box_to_parameter (const cairo_gradient_pattern_t *gradient,

					  double x0, double y0,

					  double x1, double y1,

					  double tolerance,

					  double out_range[2]);

cairo_private void

_cairo_gradient_pattern_interpolate (const cairo_gradient_pattern_t *gradient,

				     double			     t,

				     cairo_circle_double_t	    *out_circle);

cairo_private void

_cairo_pattern_alpha_range (const cairo_pattern_t *pattern,

			    double                *out_min,

			    double                *out_max);

cairo_private cairo_bool_t

_cairo_mesh_pattern_coord_box (const cairo_mesh_pattern_t *mesh,

			       double                     *out_xmin,

			       double                     *out_ymin,

			       double                     *out_xmax,

			       double                     *out_ymax);

cairo_private_no_warn cairo_filter_t

_cairo_pattern_sampled_area (const cairo_pattern_t *pattern,

			     const cairo_rectangle_int_t *extents,

			     cairo_rectangle_int_t *sample);

cairo_private void

_cairo_pattern_get_extents (const cairo_pattern_t	    *pattern,

			    cairo_rectangle_int_t           *extents);

cairo_private cairo_int_status_t

_cairo_pattern_get_ink_extents (const cairo_pattern_t	    *pattern,

				cairo_rectangle_int_t       *extents);

cairo_private unsigned long

_cairo_pattern_hash (const cairo_pattern_t *pattern);

cairo_private unsigned long

_cairo_linear_pattern_hash (unsigned long hash,

			    const cairo_linear_pattern_t *linear);

cairo_private unsigned long

_cairo_radial_pattern_hash (unsigned long hash,

			    const cairo_radial_pattern_t *radial);

cairo_private cairo_bool_t

_cairo_linear_pattern_equal (const cairo_linear_pattern_t *a,

			     const cairo_linear_pattern_t *b);

cairo_private unsigned long

_cairo_pattern_size (const cairo_pattern_t *pattern);

cairo_private cairo_bool_t

_cairo_radial_pattern_equal (const cairo_radial_pattern_t *a,

			     const cairo_radial_pattern_t *b);

cairo_private cairo_bool_t

_cairo_pattern_equal (const cairo_pattern_t *a,

		      const cairo_pattern_t *b);

/* cairo-mesh-pattern-rasterizer.c */

cairo_private void

_cairo_mesh_pattern_rasterize (const cairo_mesh_pattern_t *mesh,

			       void                       *data,

			       int                         width,

			       int                         height,

			       int                         stride,

			       double                      x_offset,

			       double                      y_offset);

cairo_private cairo_surface_t *

_cairo_raster_source_pattern_acquire (const cairo_pattern_t *abstract_pattern,

				      cairo_surface_t *target,

				      const cairo_rectangle_int_t *extents);

cairo_private void

_cairo_raster_source_pattern_release (const cairo_pattern_t *abstract_pattern,

				      cairo_surface_t *surface);

cairo_private cairo_status_t

_cairo_raster_source_pattern_snapshot (cairo_pattern_t *abstract_pattern);

cairo_private cairo_status_t

_cairo_raster_source_pattern_init_copy (cairo_pattern_t *pattern,

					const cairo_pattern_t *other);

cairo_private void

_cairo_raster_source_pattern_finish (cairo_pattern_t *abstract_pattern);

cairo_private void

_cairo_debug_print_pattern (FILE *file, const cairo_pattern_t *pattern);

CAIRO_END_DECLS

#endif /* CAIRO_PATTERN_PRIVATE */