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1affc3192b
A slight variation on the simple fill-alpha theme is that if Company is truly seeing a regression where we dither, the error on a constant background will be small and might be missed by the test suite.
94 lines
3 KiB
C
94 lines
3 KiB
C
/*
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* Copyright © 2008 Chris Wilson
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*
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* Permission to use, copy, modify, distribute, and sell this software
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* and its documentation for any purpose is hereby granted without
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* fee, provided that the above copyright notice appear in all copies
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* and that both that copyright notice and this permission notice
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* appear in supporting documentation, and that the name of
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* Chris Wilson not be used in advertising or publicity pertaining to
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* distribution of the software without specific, written prior
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* permission. Chris Wilson makes no representations about the
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* suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL CHRIS WILSON BE LIABLE FOR ANY SPECIAL,
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* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
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* IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Author: Chris Wilson <chris@chris-wilson.co.uk>
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*/
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#include "cairo-test.h"
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#define SIZE 60 /* needs to be big to check large area effects (dithering) */
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#define PAD 2
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static cairo_test_draw_function_t draw;
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static const cairo_test_t test = {
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"fill-alpha-pattern",
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"Tests using set_rgba();fill() over a linear gradient",
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2*SIZE + 4*PAD, 2*SIZE + 4*PAD,
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draw
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};
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static cairo_test_status_t
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draw (cairo_t *cr, int width, int height)
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{
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cairo_pattern_t *pattern;
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int n;
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/* draw a simple pattern behind */
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pattern = cairo_pattern_create_linear (0, 0, width, height);
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cairo_pattern_add_color_stop_rgb (pattern, 0, 1, 1, 0);
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cairo_pattern_add_color_stop_rgb (pattern, 1, 1, 1, 1);
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cairo_set_source (cr, pattern);
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cairo_pattern_destroy (pattern);
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cairo_paint (cr);
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/* square */
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cairo_rectangle (cr, PAD, PAD, SIZE, SIZE);
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cairo_set_source_rgba (cr, 1, 0, 0, .5);
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cairo_fill (cr);
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/* circle */
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cairo_translate (cr, SIZE + 2 * PAD, 0);
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cairo_arc (cr, PAD + SIZE / 2., PAD + SIZE / 2., SIZE / 2., 0, 2 * M_PI);
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cairo_set_source_rgba (cr, 0, 1, 0, .5);
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cairo_fill (cr);
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/* triangle */
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cairo_translate (cr, 0, SIZE + 2 * PAD);
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cairo_move_to (cr, PAD + SIZE / 2, PAD);
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cairo_line_to (cr, PAD + SIZE, PAD + SIZE);
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cairo_line_to (cr, PAD, PAD + SIZE);
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cairo_set_source_rgba (cr, 0, 0, 1, .5);
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cairo_fill (cr);
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/* star */
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cairo_translate (cr, -(SIZE + 2 * PAD) + SIZE/2., SIZE/2.);
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for (n = 0; n < 5; n++) {
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cairo_line_to (cr,
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SIZE/2 * cos (2*n * 2*M_PI / 10),
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SIZE/2 * sin (2*n * 2*M_PI / 10));
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cairo_line_to (cr,
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SIZE/4 * cos ((2*n+1)*2*M_PI / 10),
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SIZE/4 * sin ((2*n+1)*2*M_PI / 10));
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}
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cairo_set_source_rgba (cr, 0, 0, 0, .5);
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cairo_fill (cr);
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return CAIRO_TEST_SUCCESS;
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}
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int
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main (void)
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{
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return cairo_test (&test);
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}
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