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/*
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 * Copyright © 2005 Red Hat, Inc.
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 *
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 * Permission to use, copy, modify, distribute, and sell this software
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 * and its documentation for any purpose is hereby granted without
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 * fee, provided that the above copyright notice appear in all copies
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 * and that both that copyright notice and this permission notice
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 * appear in supporting documentation, and that the name of
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 * Red Hat, Inc. not be used in advertising or publicity pertaining to
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 * distribution of the software without specific, written prior
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 * permission. Red Hat, Inc. makes no representations about the
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 * suitability of this software for any purpose.  It is provided "as
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 * is" without express or implied warranty.
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 *
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 * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
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 * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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 * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
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 * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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 * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
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 * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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 *
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 * Author: Carl D. Worth <cworth@cworth.org>
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 */
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#include "cairo-test.h"
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#define STAMP_WIDTH  4
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#define STAMP_HEIGHT 4
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#define PAD          1
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#define STEPS	     10
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#define IMAGE_WIDTH  (PAD + STEPS * (STAMP_WIDTH  + PAD) + PAD)
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#define IMAGE_HEIGHT (PAD + STEPS * (STAMP_HEIGHT + PAD) + PAD)
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static cairo_test_status_t
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3
draw (cairo_t *cr, int width, int height)
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{
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    cairo_surface_t *surface;
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3
    uint32_t data[STAMP_WIDTH * STAMP_HEIGHT] = {
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	0xffffffff, 0xffffffff,		0xffff0000, 0xffff0000,
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	0xffffffff, 0xffffffff,		0xffff0000, 0xffff0000,
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	0xff00ff00, 0xff00ff00,		0xff0000ff, 0xff0000ff,
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	0xff00ff00, 0xff00ff00,		0xff0000ff, 0xff0000ff
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    };
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    int i, j;
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    /* fill with off-white to avoid a separate rgb24 ref image */
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3
    cairo_save (cr);
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3
    cairo_set_source_rgb (cr, .7, .7, .7);
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3
    cairo_paint (cr);
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3
    cairo_restore (cr);
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    /* Draw reference lines where the jump should be. */
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3
    cairo_move_to (cr, PAD + STEPS / 2 * (STAMP_WIDTH + PAD), 0);
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    cairo_rel_line_to (cr, 0, IMAGE_HEIGHT);
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    cairo_move_to (cr, 0, PAD + STEPS / 2 * (STAMP_HEIGHT + PAD));
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    cairo_rel_line_to (cr, IMAGE_WIDTH, 0);
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    cairo_set_line_width (cr, 2.0);
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    cairo_stroke (cr);
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3
    surface = cairo_image_surface_create_for_data ((unsigned char *) data,
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						   CAIRO_FORMAT_RGB24,
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						   STAMP_WIDTH,
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						   STAMP_HEIGHT,
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						   STAMP_WIDTH * 4);
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    for (j=0; j < STEPS; j++) {
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	double j_step;
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	for (i=0; i < STEPS; i++) {
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	    double i_step;
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#define GENERATE_REFERENCE_IMAGE 0
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#if GENERATE_REFERENCE_IMAGE
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	    i_step = i >= STEPS / 2 ? 1 : 0;
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	    j_step = j >= STEPS / 2 ? 1 : 0;
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#else
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	    i_step = i * 1.0 / STEPS;
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	    j_step = j * 1.0 / STEPS;
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#endif
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	    cairo_save (cr);
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	    cairo_set_source_surface (cr, surface,
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				      PAD + i * (STAMP_WIDTH  + PAD) + i_step,
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				      PAD + j * (STAMP_HEIGHT + PAD) + j_step);
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	    cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_NEAREST);
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	    cairo_paint (cr);
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	    cairo_restore (cr);
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	}
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    }
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3
    cairo_surface_finish (surface); /* data goes out of scope */
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3
    cairo_surface_destroy (surface);
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3
    return CAIRO_TEST_SUCCESS;
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}
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1
CAIRO_TEST (filter_nearest_offset,
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	    "Test sampling offset of CAIRO_FILTER_NEAREST"
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	    "\nwrong sampling location for nearest-neighbor filter in libpixman and Render",
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	    "filter", /* keywords */
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	    NULL, /* requirements */
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	    IMAGE_WIDTH, IMAGE_HEIGHT,
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	    NULL, draw)