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Diffstat (limited to 'libs/cairo-1.16.0/test/in-fill-empty-trapezoid.c')
| -rw-r--r-- | libs/cairo-1.16.0/test/in-fill-empty-trapezoid.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/test/in-fill-empty-trapezoid.c b/libs/cairo-1.16.0/test/in-fill-empty-trapezoid.c new file mode 100644 index 0000000..0797399 --- /dev/null +++ b/libs/cairo-1.16.0/test/in-fill-empty-trapezoid.c @@ -0,0 +1,109 @@ +/* + * Copyright © 2006 M Joonas Pihlaja + * + * 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. + * + * Author: M Joonas Pihlaja <jpihlaja@cc.helsinki.fi> + */ + +/* Bug history + * + * 2006-12-05 M Joonas Pihlaja <jpihlaja@cc.helsinki.fi> + * + * The cairo_in_fill () function can sometimes produce false + * positives when the tessellator produces empty trapezoids + * and the query point lands exactly on a trapezoid edge. + */ + +#include "cairo-test.h" + +static cairo_test_status_t +preamble (cairo_test_context_t *ctx) +{ + int x,y; + int width = 10; + int height = 10; + cairo_surface_t *surf; + cairo_t *cr; + int false_positive_count = 0; + cairo_status_t status; + cairo_test_status_t ret; + + surf = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height); + cr = cairo_create (surf); + cairo_surface_destroy (surf); + + /* Empty horizontal trapezoid. */ + cairo_move_to (cr, 0, height/3); + cairo_line_to (cr, width, height/3); + cairo_close_path (cr); + + /* Empty non-horizontal trapezoid #1. */ + cairo_move_to (cr, 0, 0); + cairo_line_to (cr, width, height/2); + cairo_close_path (cr); + + /* Empty non-horizontal trapezoid #2 intersecting #1. */ + cairo_move_to (cr, 0, height/2); + cairo_line_to (cr, width, 0); + cairo_close_path (cr); + + status = cairo_status (cr); + + /* Point sample the tessellated path. */ + for (y = 0; y < height; y++) { + for (x = 0; x < width; x++) { + if (cairo_in_fill (cr, x, y)) { + false_positive_count++; + } + } + } + cairo_destroy (cr); + + /* Check that everything went well. */ + ret = CAIRO_TEST_SUCCESS; + if (CAIRO_STATUS_SUCCESS != status) { + cairo_test_log (ctx, "Failed to create a test surface and path: %s\n", + cairo_status_to_string (status)); + ret = CAIRO_TEST_XFAILURE; + } + + if (0 != false_positive_count) { + cairo_test_log (ctx, "Point sampling found %d false positives " + "from cairo_in_fill()\n", + false_positive_count); + ret = CAIRO_TEST_XFAILURE; + } + + return ret; +} + +/* + * XFAIL: The cairo_in_fill () function can sometimes produce false positives + * when the tessellator produces empty trapezoids and the query point lands + * exactly on a trapezoid edge. + */ +CAIRO_TEST (in_fill_empty_trapezoid, + "Test that the tessellator isn't producing obviously empty trapezoids", + "in, trap", /* keywords */ + NULL, /* requirements */ + 0, 0, + preamble, NULL) |