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

 *

 * Copyright © 2005 Red Hat, Inc

 * Copyright © 2007 Adrian Johnson

 * Copyright © 2009 Chris Wilson

 *

 * 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):

 *      Chris Wilson 

 */

#include "cairoint.h"

#include "cairo-clip-inline.h"

#include "cairo-error-private.h"

#include "cairo-pattern-private.h"

#include "cairo-surface-offset-private.h"

/* A collection of routines to facilitate drawing to an alternate surface. */

static void

_copy_transformed_pattern (cairo_pattern_t *pattern,

			   const cairo_pattern_t *original,

			   const cairo_matrix_t  *ctm_inverse)

{

    _cairo_pattern_init_static_copy (pattern, original);

    if (! _cairo_matrix_is_identity (ctm_inverse))

	_cairo_pattern_transform (pattern, ctm_inverse);

}

cairo_status_t

_cairo_surface_offset_paint (cairo_surface_t		*target,

			     int x, int y,

			     cairo_operator_t		 op,

			     const cairo_pattern_t	*source,

			     const cairo_clip_t		*clip)

{

    cairo_status_t status;

    cairo_clip_t *dev_clip = (cairo_clip_t *) clip;

    cairo_pattern_union_t source_copy;

    if (unlikely (target->status))

	return target->status;

    if (_cairo_clip_is_all_clipped (clip))

	return CAIRO_STATUS_SUCCESS;

    if (x | y) {

	cairo_matrix_t m;

	dev_clip = _cairo_clip_copy_with_translation (clip, -x, -y);

	cairo_matrix_init_translate (&m, x, y);

	_copy_transformed_pattern (&source_copy.base, source, &m);

	source = &source_copy.base;

    }

    status = _cairo_surface_paint (target, op, source, dev_clip);

    if (dev_clip != clip)

	_cairo_clip_destroy (dev_clip);

    return status;

}

cairo_status_t

_cairo_surface_offset_mask (cairo_surface_t		*target,

			    int x, int y,

			    cairo_operator_t		 op,

			    const cairo_pattern_t	*source,

			    const cairo_pattern_t	*mask,

			    const cairo_clip_t		*clip)

{

    cairo_status_t status;

    cairo_clip_t *dev_clip = (cairo_clip_t *) clip;

    cairo_pattern_union_t source_copy;

    cairo_pattern_union_t mask_copy;

    if (unlikely (target->status))

	return target->status;

    if (_cairo_clip_is_all_clipped (clip))

	return CAIRO_STATUS_SUCCESS;

    if (x | y) {

	cairo_matrix_t m;

	dev_clip = _cairo_clip_copy_with_translation (clip, -x, -y);

	cairo_matrix_init_translate (&m, x, y);

	_copy_transformed_pattern (&source_copy.base, source, &m);

	_copy_transformed_pattern (&mask_copy.base, mask, &m);

	source = &source_copy.base;

	mask = &mask_copy.base;

    }

    status = _cairo_surface_mask (target, op,

				  source, mask,

				  dev_clip);

    if (dev_clip != clip)

	_cairo_clip_destroy (dev_clip);

    return status;

}

cairo_status_t

_cairo_surface_offset_stroke (cairo_surface_t		*surface,

			      int x, int y,

			      cairo_operator_t		 op,

			      const cairo_pattern_t	*source,

			      const cairo_path_fixed_t	*path,

			      const cairo_stroke_style_t*stroke_style,

			      const cairo_matrix_t	*ctm,

			      const cairo_matrix_t	*ctm_inverse,

			      double			 tolerance,

			      cairo_antialias_t		 antialias,

			      const cairo_clip_t		*clip)

{

    cairo_path_fixed_t path_copy, *dev_path = (cairo_path_fixed_t *) path;

    cairo_clip_t *dev_clip = (cairo_clip_t *) clip;

    cairo_matrix_t dev_ctm = *ctm;

    cairo_matrix_t dev_ctm_inverse = *ctm_inverse;

    cairo_pattern_union_t source_copy;

    cairo_status_t status;

    if (unlikely (surface->status))

	return surface->status;

    if (_cairo_clip_is_all_clipped (clip))

	return CAIRO_STATUS_SUCCESS;

    if (x | y) {

	cairo_matrix_t m;

	dev_clip = _cairo_clip_copy_with_translation (clip, -x, -y);

	status = _cairo_path_fixed_init_copy (&path_copy, dev_path);

	if (unlikely (status))

	    goto FINISH;

	_cairo_path_fixed_translate (&path_copy,

				     _cairo_fixed_from_int (-x),

				     _cairo_fixed_from_int (-y));

	dev_path = &path_copy;

	cairo_matrix_init_translate (&m, -x, -y);

	cairo_matrix_multiply (&dev_ctm, &dev_ctm, &m);

	cairo_matrix_init_translate (&m, x, y);

	_copy_transformed_pattern (&source_copy.base, source, &m);

	source = &source_copy.base;

	cairo_matrix_multiply (&dev_ctm_inverse, &m, &dev_ctm_inverse);

    }

    status = _cairo_surface_stroke (surface, op, source,

				    dev_path, stroke_style,

				    &dev_ctm, &dev_ctm_inverse,

				    tolerance, antialias,

				    dev_clip);

FINISH:

    if (dev_path != path)

	_cairo_path_fixed_fini (dev_path);

    if (dev_clip != clip)

	_cairo_clip_destroy (dev_clip);

    return status;

}

cairo_status_t

_cairo_surface_offset_fill (cairo_surface_t	*surface,

			    int x, int y,

			    cairo_operator_t	 op,

			    const cairo_pattern_t*source,

			    const cairo_path_fixed_t	*path,

			    cairo_fill_rule_t	 fill_rule,

			    double		 tolerance,

			    cairo_antialias_t	 antialias,

			    const cairo_clip_t	*clip)

{

    cairo_status_t status;

    cairo_path_fixed_t path_copy, *dev_path = (cairo_path_fixed_t *) path;

    cairo_clip_t *dev_clip = (cairo_clip_t *) clip;

    cairo_pattern_union_t source_copy;

    if (unlikely (surface->status))

	return surface->status;

    if (_cairo_clip_is_all_clipped (clip))

	return CAIRO_STATUS_SUCCESS;

    if (x | y) {

	cairo_matrix_t m;

	dev_clip = _cairo_clip_copy_with_translation (clip, -x, -y);

	status = _cairo_path_fixed_init_copy (&path_copy, dev_path);

	if (unlikely (status))

	    goto FINISH;

	_cairo_path_fixed_translate (&path_copy,

				     _cairo_fixed_from_int (-x),

				     _cairo_fixed_from_int (-y));

	dev_path = &path_copy;

	cairo_matrix_init_translate (&m, x, y);

	_copy_transformed_pattern (&source_copy.base, source, &m);

	source = &source_copy.base;

    }

    status = _cairo_surface_fill (surface, op, source,

				  dev_path, fill_rule,

				  tolerance, antialias,

				  dev_clip);

FINISH:

    if (dev_path != path)

	_cairo_path_fixed_fini (dev_path);

    if (dev_clip != clip)

	_cairo_clip_destroy (dev_clip);

    return status;

}

cairo_status_t

_cairo_surface_offset_glyphs (cairo_surface_t		*surface,

			      int x, int y,

			      cairo_operator_t		 op,

			      const cairo_pattern_t	*source,

			      cairo_scaled_font_t	*scaled_font,

			      cairo_glyph_t		*glyphs,

			      int			 num_glyphs,

			      const cairo_clip_t	*clip)

{

    cairo_status_t status;

    cairo_clip_t *dev_clip = (cairo_clip_t *) clip;

    cairo_pattern_union_t source_copy;

    cairo_glyph_t *dev_glyphs;

    int i;

    if (unlikely (surface->status))

	return surface->status;

    if (_cairo_clip_is_all_clipped (clip))

	return CAIRO_STATUS_SUCCESS;

    dev_glyphs = _cairo_malloc_ab (num_glyphs, sizeof (cairo_glyph_t));

    if (dev_glyphs == NULL)

	return _cairo_error (CAIRO_STATUS_NO_MEMORY);

    memcpy (dev_glyphs, glyphs, sizeof (cairo_glyph_t) * num_glyphs);

    if (x | y) {

	cairo_matrix_t m;

	dev_clip = _cairo_clip_copy_with_translation (clip, -x, -y);

	cairo_matrix_init_translate (&m, x, y);

	_copy_transformed_pattern (&source_copy.base, source, &m);

	source = &source_copy.base;

	for (i = 0; i < num_glyphs; i++) {

	    dev_glyphs[i].x -= x;

	    dev_glyphs[i].y -= y;

	}

    }

    status = _cairo_surface_show_text_glyphs (surface, op, source,

					      NULL, 0,

					      dev_glyphs, num_glyphs,

					      NULL, 0, 0,

					      scaled_font,

					      dev_clip);

    if (dev_clip != clip)

	_cairo_clip_destroy (dev_clip);

    free (dev_glyphs);

    return status;

}