diff options
Diffstat (limited to 'libs/cairo-1.16.0/test/fill-and-stroke-alpha.c')
| -rw-r--r-- | libs/cairo-1.16.0/test/fill-and-stroke-alpha.c | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/test/fill-and-stroke-alpha.c b/libs/cairo-1.16.0/test/fill-and-stroke-alpha.c new file mode 100644 index 0000000..c6d7c00 --- /dev/null +++ b/libs/cairo-1.16.0/test/fill-and-stroke-alpha.c @@ -0,0 +1,101 @@ +/* + * Copyright © 2005 Red Hat, Inc. + * Copyright © 2006 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 PAD 2 +#define SIZE 10 + +typedef void (*path_func_t) (cairo_t *cr); + +static void +rectangle (cairo_t *cr) +{ + cairo_rectangle (cr, PAD, PAD, SIZE, SIZE); +} + +static void +circle (cairo_t *cr) +{ + cairo_arc (cr, + PAD + SIZE / 2, PAD + SIZE / 2, + SIZE / 2, + 0, 2 * M_PI); +} + +/* Given a path-generating function and two opaque patterns, fill and + * stroke the path with the patterns (to an offscreen group), then + * blend the result into the destination with the given alpha + * value. + */ +static void +fill_and_stroke_alpha (cairo_t *cr, + path_func_t path_func, + cairo_pattern_t *fill_pattern, + cairo_pattern_t *stroke_pattern, + double alpha) +{ + cairo_push_group (cr); + { + (path_func) (cr); + cairo_set_source (cr, fill_pattern); + cairo_fill_preserve (cr); + cairo_set_source (cr, stroke_pattern); + cairo_stroke (cr); + } + cairo_pop_group_to_source (cr); + cairo_paint_with_alpha (cr, alpha); +} + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + cairo_pattern_t *blue; + cairo_pattern_t *red; + + blue = cairo_pattern_create_rgb (0.0, 0.0, 1.0); + red = cairo_pattern_create_rgb (1.0, 0.0, 0.0); + + cairo_test_paint_checkered (cr); + + fill_and_stroke_alpha (cr, rectangle, blue, red, 0.5); + + cairo_translate (cr, SIZE + 2 * PAD, 0); + + fill_and_stroke_alpha (cr, circle, red, blue, 0.5); + + cairo_pattern_destroy (blue); + cairo_pattern_destroy (red); + + return CAIRO_TEST_SUCCESS; +} + +CAIRO_TEST (fill_and_stroke_alpha, + "Use a group to fill/stroke a path then blend the result with alpha onto the destination", + "fill-and-stroke, fill, stroke", /* keywords */ + NULL, /* requirements */ + 2 * SIZE + 4 * PAD, SIZE + 2 * PAD, + NULL, draw) |