diff options
Diffstat (limited to 'test/filter-bilinear-extents.c')
-rw-r--r-- | test/filter-bilinear-extents.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/test/filter-bilinear-extents.c b/test/filter-bilinear-extents.c new file mode 100644 index 000000000..79d36f6e6 --- /dev/null +++ b/test/filter-bilinear-extents.c @@ -0,0 +1,102 @@ +/* + * 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) |