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/*
* Copyright © 2007 Adrian Johnson
*
* 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: Adrian Johnson <ajohnson@redneon.com>
*/
#include "cairo-test.h"
#define SIZE 40
#define PAD 2
#define WIDTH (PAD + SIZE + PAD)
#define HEIGHT WIDTH
/* This test is designed to test that PDF viewers use the correct
* alpha values in an Alpha SMasks. Some viewers use the color values
* instead of the alpha. The test draws a triangle and rectangle in a
* group then draws the group using cairo_mask(). The mask consists of
* a circle with the rgba (0.4, 0.4, 0.4, 0.8) and the background rgba
* (0.8, 0.8, 0.8, 0.4).
*/
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
cairo_pattern_t *pattern;
cairo_translate (cr, PAD, PAD);
/* mask */
cairo_push_group (cr);
cairo_set_source_rgba (cr, 0.8, 0.8, 0.8, 0.4);
cairo_paint (cr);
cairo_arc (cr, SIZE / 2, SIZE / 2, SIZE / 6, 0., 2. * M_PI);
cairo_set_source_rgba (cr, 0.4, 0.4, 0.4, 0.8);
cairo_fill (cr);
pattern = cairo_pop_group (cr);
/* source */
cairo_push_group (cr);
cairo_rectangle (cr, 0.3 * SIZE, 0.2 * SIZE, 0.5 * SIZE, 0.5 * SIZE);
cairo_set_source_rgb (cr, 0, 0, 1);
cairo_fill (cr);
cairo_move_to (cr, 0.0, 0.8 * SIZE);
cairo_rel_line_to (cr, 0.7 * SIZE, 0.0);
cairo_rel_line_to (cr, -0.375 * SIZE, -0.6 * SIZE);
cairo_close_path (cr);
cairo_set_source_rgb (cr, 0, 1, 0);
cairo_fill (cr);
cairo_pop_group_to_source (cr);
cairo_mask (cr, pattern);
cairo_pattern_destroy (pattern);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (mask_alpha,
"A simple test painting a group through a circle mask",
"mask, alpha", /* keywords */
NULL, /* requirements */
WIDTH, HEIGHT,
NULL, draw)
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