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Diffstat (limited to 'test/filter-nearest-offset.c')
-rw-r--r-- | test/filter-nearest-offset.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/test/filter-nearest-offset.c b/test/filter-nearest-offset.c new file mode 100644 index 000000000..4df609702 --- /dev/null +++ b/test/filter-nearest-offset.c @@ -0,0 +1,109 @@ +/* + * 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) |