| /* |
| * 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 possibly translucent |
| * patterns, fill and stroke the path with the patterns (to an |
| * offscreen group), then blend the result into the destination. |
| */ |
| static void |
| fill_and_stroke (cairo_t *cr, |
| path_func_t path_func, |
| cairo_pattern_t *fill_pattern, |
| cairo_pattern_t *stroke_pattern) |
| { |
| cairo_push_group (cr); |
| { |
| (path_func) (cr); |
| cairo_set_source (cr, fill_pattern); |
| cairo_fill_preserve (cr); |
| |
| /* Use DEST_OUT to subtract stroke from fill. */ |
| cairo_set_source_rgb (cr, 0.0, 0.0, 0.0); |
| cairo_set_operator (cr, CAIRO_OPERATOR_DEST_OUT); |
| cairo_stroke_preserve (cr); |
| |
| /* Then use ADD to draw the stroke without a seam. */ |
| cairo_set_source (cr, stroke_pattern); |
| cairo_set_operator (cr, CAIRO_OPERATOR_ADD); |
| cairo_stroke (cr); |
| } |
| cairo_pop_group_to_source (cr); |
| cairo_paint (cr); |
| } |
| |
| 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_rgba (0.0, 0.0, 1.0, 0.8); |
| red = cairo_pattern_create_rgba (1.0, 0.0, 0.0, 0.2); |
| |
| cairo_test_paint_checkered (cr); |
| |
| fill_and_stroke (cr, rectangle, blue, red); |
| |
| cairo_translate (cr, SIZE + 2 * PAD, 0); |
| |
| fill_and_stroke (cr, circle, red, blue); |
| |
| cairo_pattern_destroy (blue); |
| cairo_pattern_destroy (red); |
| |
| return CAIRO_TEST_SUCCESS; |
| } |
| |
| CAIRO_TEST (fill_and_stroke_alpha_add, |
| "Use a group to fill/stroke a path (each with different alpha) using DEST_OUT and ADD to combine", |
| "fill-and-stroke, fill, stroke", /* keywords */ |
| NULL, /* requirements */ |
| 2 * SIZE + 4 * PAD, SIZE + 2 * PAD, |
| NULL, draw) |