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[test] Add a rectilinear-dash test case.

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Exercise dashing on pixel-aligned boundaries to test extending the
rectilinear stroker to handle dashes.
This commit is contained in:
Chris Wilson 2008-11-30 13:48:11 +00:00
parent 1d68ee73f8
commit fe4af195a7
3 changed files with 178 additions and 0 deletions
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2
test/Makefile.am
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@ -138,6 +138,7 @@ test_sources = \
rectangle-rounding-error.c \
rectilinear-fill.c \
rectilinear-miter-limit.c \
rectilinear-dash.c \
rectilinear-stroke.c \
reflected-stroke.c \
rel-path.c \
@ -791,6 +792,7 @@ REFERENCE_IMAGES = \
rectilinear-miter-limit.ref.png \
rectilinear-miter-limit.ps2.ref.png \
rectilinear-miter-limit.ps3.ref.png \
rectilinear-dash.ref.png \
rectilinear-stroke.ref.png \
reflected-stroke.ref.png \
reflected-stroke.ps2.ref.png \

176
test/rectilinear-dash.c Normal file
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@ -0,0 +1,176 @@
/*
* Copyright © 2006 Red Hat, Inc.
* Copyright © 2008 Chris Wilson
*
* 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: Carl D. Worth <cworth@cworth.org>
* Chris Wilson <chris@chris-wilson.co.uk>
*
* Based on the original test/rectilinear-stroke.c by Carl D. Worth.
*/
#include "cairo-test.h"
#define SIZE 50
static void
draw_dashes (cairo_t *cr)
{
const double dash_square[4] = {4, 2, 2, 2};
const double dash_butt[4] = {5, 1, 3, 1};
cairo_save (cr);
cairo_set_dash (cr, dash_square, 4, 0);
cairo_set_line_width (cr, 1.0);
cairo_translate (cr, 1, 1);
/* Draw everything first with square caps. */
cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
/* Draw horizontal and vertical segments, each in both
* directions. */
cairo_move_to (cr, 4.5, 0.5);
cairo_rel_line_to (cr, 2.0, 0.0);
cairo_move_to (cr, 10.5, 4.5);
cairo_rel_line_to (cr, 0.0, 2.0);
cairo_move_to (cr, 6.5, 10.5);
cairo_rel_line_to (cr, -2.0, 0.0);
cairo_move_to (cr, 0.5, 6.5);
cairo_rel_line_to (cr, 0.0, -2.0);
/* Draw right angle turns in four directions. */
cairo_move_to (cr, 0.5, 2.5);
cairo_rel_line_to (cr, 0.0, -2.0);
cairo_rel_line_to (cr, 2.0, 0.0);
cairo_move_to (cr, 8.5, 0.5);
cairo_rel_line_to (cr, 2.0, 0.0);
cairo_rel_line_to (cr, 0.0, 2.0);
cairo_move_to (cr, 10.5, 8.5);
cairo_rel_line_to (cr, 0.0, 2.0);
cairo_rel_line_to (cr, -2.0, 0.0);
cairo_move_to (cr, 2.5, 10.5);
cairo_rel_line_to (cr, -2.0, 0.0);
cairo_rel_line_to (cr, 0.0, -2.0);
cairo_stroke (cr);
/* Draw a closed-path rectangle */
cairo_rectangle (cr, 0.5, 12.5, 10.0, 10.0);
cairo_set_dash (cr, dash_square, 4, 2);
cairo_stroke (cr);
cairo_translate (cr, 12, 0);
/* Now draw the same results, but with butt caps. */
cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
cairo_set_dash (cr, dash_butt, 4, 0.0);
/* Draw horizontal and vertical segments, each in both
* directions. */
cairo_move_to (cr, 4.0, 0.5);
cairo_rel_line_to (cr, 3.0, 0.0);
cairo_move_to (cr, 10.5, 4.0);
cairo_rel_line_to (cr, 0.0, 3.0);
cairo_move_to (cr, 7.0, 10.5);
cairo_rel_line_to (cr, -3.0, 0.0);
cairo_move_to (cr, 0.5, 7.0);
cairo_rel_line_to (cr, 0.0, -3.0);
/* Draw right angle turns in four directions. */
cairo_move_to (cr, 0.5, 3.0);
cairo_rel_line_to (cr, 0.0, -2.5);
cairo_rel_line_to (cr, 2.5, 0.0);
cairo_move_to (cr, 8.0, 0.5);
cairo_rel_line_to (cr, 2.5, 0.0);
cairo_rel_line_to (cr, 0.0, 2.5);
cairo_move_to (cr, 10.5, 8.0);
cairo_rel_line_to (cr, 0.0, 2.5);
cairo_rel_line_to (cr, -2.5, 0.0);
cairo_move_to (cr, 3.0, 10.5);
cairo_rel_line_to (cr, -2.5, 0.0);
cairo_rel_line_to (cr, 0.0, -2.5);
cairo_stroke (cr);
/* Draw a closed-path rectangle */
cairo_set_dash (cr, dash_butt, 4, 2.5);
cairo_rectangle (cr, 0.5, 12.5, 10.0, 10.0);
cairo_stroke (cr);
cairo_restore (cr);
}
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
/* Paint background white, then draw in black. */
cairo_set_source_rgb (cr, 1.0, 1.0, 1.0);
cairo_paint (cr);
cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
draw_dashes (cr);
cairo_save (cr);
cairo_set_source_rgb (cr, 1.0, 0.0, 0.0);
cairo_translate (cr, 0, height);
cairo_scale (cr, 1, -1);
draw_dashes (cr);
cairo_restore (cr);
cairo_save (cr);
cairo_set_source_rgb (cr, 0.0, 1.0, 0.0);
cairo_translate (cr, width, 0);
cairo_scale (cr, -1, 1);
draw_dashes (cr);
cairo_restore (cr);
cairo_save (cr);
cairo_set_source_rgb (cr, 0.0, 0.0, 1.0);
cairo_translate (cr, width, height);
cairo_scale (cr, -1, -1);
draw_dashes (cr);
cairo_restore (cr);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (rectilinear_dash,
"Test dashed rectilinear stroke operations (covering only whole pixels)",
"stroke dash", /* keywords */
NULL, /* requirements */
SIZE, SIZE,
NULL, draw)

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