/*

 * Copyright © 2005 Red Hat, Inc.

 *

 * Permission to use, copy, modify, distribute, and sell this software

 * and its documentation for any purpose is hereby granted without

 * fee, provided that the above copyright notice appear in all copies

 * and that both that copyright notice and this permission notice

 * appear in supporting documentation, and that the name of

 * Red Hat, Inc. not be used in advertising or publicity pertaining to

 * distribution of the software without specific, written prior

 * permission. Red Hat, Inc. makes no representations about the

 * suitability of this software for any purpose.  It is provided "as

 * is" without express or implied warranty.

 *

 * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS

 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND

 * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,

 * 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.

 *

 * Author: Carl D. Worth <cworth@cworth.org>

 */

#include "cairo-test.h"

#define STAMP_WIDTH  4

#define STAMP_HEIGHT 4

#define PAD          1

#define STEPS	     10

#define IMAGE_WIDTH  (PAD + STEPS * (STAMP_WIDTH  + PAD) + PAD)

#define IMAGE_HEIGHT (PAD + STEPS * (STAMP_HEIGHT + PAD) + PAD)

static cairo_test_status_t

draw (cairo_t *cr, int width, int height)

{

    cairo_surface_t *surface;

    uint32_t data[STAMP_WIDTH * STAMP_HEIGHT] = {

	0xffffffff, 0xffffffff,		0xffff0000, 0xffff0000,

	0xffffffff, 0xffffffff,		0xffff0000, 0xffff0000,

	0xff00ff00, 0xff00ff00,		0xff0000ff, 0xff0000ff,

	0xff00ff00, 0xff00ff00,		0xff0000ff, 0xff0000ff

    };

    int i, j;

    /* fill with off-white to avoid a separate rgb24 ref image */

    cairo_save (cr);

    cairo_set_source_rgb (cr, .7, .7, .7);

    cairo_paint (cr);

    cairo_restore (cr);

    /* Draw reference lines where the jump should be. */

    cairo_move_to (cr, PAD + STEPS / 2 * (STAMP_WIDTH + PAD), 0);

    cairo_rel_line_to (cr, 0, IMAGE_HEIGHT);

    cairo_move_to (cr, 0, PAD + STEPS / 2 * (STAMP_HEIGHT + PAD));

    cairo_rel_line_to (cr, IMAGE_WIDTH, 0);

    cairo_set_line_width (cr, 2.0);

    cairo_stroke (cr);

    surface = cairo_image_surface_create_for_data ((unsigned char *) data,

						   CAIRO_FORMAT_RGB24,

						   STAMP_WIDTH,

						   STAMP_HEIGHT,

						   STAMP_WIDTH * 4);

    for (j=0; j < STEPS; j++) {

	double j_step;

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

	    double i_step;

#define GENERATE_REFERENCE_IMAGE 0

#if GENERATE_REFERENCE_IMAGE

	    i_step = i >= STEPS / 2 ? 1 : 0;

	    j_step = j >= STEPS / 2 ? 1 : 0;

#else

	    i_step = i * 1.0 / STEPS;

	    j_step = j * 1.0 / STEPS;

#endif

	    cairo_save (cr);

	    cairo_set_source_surface (cr, surface,

				      PAD + i * (STAMP_WIDTH  + PAD) + i_step,

				      PAD + j * (STAMP_HEIGHT + PAD) + j_step);

	    cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_NEAREST);

	    cairo_paint (cr);

	    cairo_restore (cr);

	}

    }

    cairo_surface_finish (surface); /* data goes out of scope */

    cairo_surface_destroy (surface);

    return CAIRO_TEST_SUCCESS;

}

CAIRO_TEST (filter_nearest_offset,

	    "Test sampling offset of CAIRO_FILTER_NEAREST"

	    "\nwrong sampling location for nearest-neighbor filter in libpixman and Render",

	    "filter", /* keywords */

	    NULL, /* requirements */

	    IMAGE_WIDTH, IMAGE_HEIGHT,

	    NULL, draw)