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/*
* Copyright © 2008 Red Hat, Inc.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Authors: Carl D. Worth <cworth@cworth.org>
* Owen Taylor <otaylor@redhat.com>
*/
#include "cairo-test.h"
/* This test exercises code that computes the extents of a surface
* pattern with CAIRO_FILTER_BILINEAR, (where the filtering
* effectively increases the extents of the pattern).
*
* The original bug was reported by Owen Taylor here:
*
* bad clipping with EXTEND_NONE
* http://bugs.freedesktop.org/show_bug.cgi?id=15349
*/
#define SCALE 10
#define PAD 3
#define WIDTH (PAD + 3 * SCALE + PAD)
#define HEIGHT WIDTH
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
cairo_surface_t *image;
cairo_t *cr2;
image = cairo_image_surface_create (CAIRO_FORMAT_RGB24, 2, 2);
/* Fill with an opaque background to avoid a separate rgb24 ref image */
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_paint (cr);
/* First check handling of pattern extents > surface extents */
cairo_save (cr);
cairo_scale (cr, width/2., height/2.);
/* Create a solid black source to merge with the background */
cr2 = cairo_create (image);
cairo_set_source_rgb (cr2, 0, 0 ,0);
cairo_paint (cr2);
cairo_set_source_surface (cr, cairo_get_target (cr2), 0, 0);
cairo_destroy (cr2);
cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_BILINEAR);
cairo_paint (cr);
cairo_restore (cr);
/* Then scale to smaller so we can see the full bilinear extents */
cairo_save (cr);
cairo_translate (cr, PAD, PAD);
cairo_scale (cr, SCALE, SCALE);
cairo_translate (cr, 0.5, 0.5);
/* Create a 2x2 blue+red checkerboard source */
cr2 = cairo_create (image);
cairo_set_source_rgb (cr2, 1, 0 ,0); /* red */
cairo_paint (cr2);
cairo_set_source_rgb (cr2, 0, 0, 1); /* blue */
cairo_rectangle (cr2, 0, 1, 1, 1);
cairo_rectangle (cr2, 1, 0, 1, 1);
cairo_fill (cr2);
cairo_set_source_surface (cr, cairo_get_target (cr2), 0, 0);
cairo_destroy (cr2);
cairo_pattern_set_filter (cairo_get_source (cr), CAIRO_FILTER_BILINEAR);
cairo_paint (cr);
cairo_restore (cr);
cairo_surface_destroy (image);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (filter_bilinear_extents,
"Test that pattern extents are properly computed for CAIRO_FILTER_BILINEAR",
"extents", /* keywords */
NULL, /* requirements */
WIDTH, HEIGHT,
NULL, draw)
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