/* * 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)