/* * 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 10cairo_test_t 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",    2 * SIZE + 4 * PAD, SIZE + 2 * PAD};typedef void (*path_func_t) (cairo_t *cr);static voidrectangle (cairo_t *cr){    cairo_rectangle (cr, PAD, PAD, SIZE, SIZE);}static voidcircle (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 voidfill_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_tdraw (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;}intmain (void){    return cairo_test (&test, draw);}