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/*
* 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)
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