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/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
/*
* Copyright 2010 Andrea Canciani
*
* 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: Andrea Canciani <ranma42@gmail.com>
*/
#include "cairo-test.h"
#define SIZE 52
#define OFFSET 5
#define DISTANCE 10.25
/*
This test checks that boxes not aligned to pixels are drawn
correctly.
In particular the corners of the boxes are drawn incorrectly by
cairo-image in cairo 1.10.0, because overlapping boxes are passed to
a span converter which assumes disjoint boxes as input.
This results in corners to be drawn with the wrong shade.
*/
static cairo_test_status_t
draw (cairo_t *cr, int width, int height)
{
int i;
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_set_line_width (cr, 4);
cairo_translate (cr, 2*OFFSET, 2*OFFSET);
for (i = 0; i < 4; i++) {
double x = i * DISTANCE;
cairo_move_to (cr, x, -OFFSET-0.75);
cairo_line_to (cr, x, SIZE-3*OFFSET-0.25);
cairo_move_to (cr, -OFFSET-0.75, x);
cairo_line_to (cr, SIZE-3*OFFSET-0.25, x);
}
cairo_stroke (cr);
return CAIRO_TEST_SUCCESS;
}
static cairo_test_status_t
aligned (cairo_t *cr, int width, int height)
{
cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
return draw (cr, width, height);
}
CAIRO_TEST (rectilinear_grid,
"Test rectilinear rasterizer (covering partial pixels)",
"rectilinear", /* keywords */
NULL, /* requirements */
SIZE, SIZE,
NULL, draw)
CAIRO_TEST (a1_rectilinear_grid,
"Test rectilinear rasterizer (covering whole pixels)",
"rectilinear", /* keywords */
"target=raster", /* requirements */
SIZE, SIZE,
NULL, aligned)
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