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-rw-r--r--test/filter-nearest-offset.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/test/filter-nearest-offset.c b/test/filter-nearest-offset.c
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+++ b/test/filter-nearest-offset.c
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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)