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92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
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/*
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* Copyright 2010 Andrea Canciani
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Author: Andrea Canciani <ranma42@gmail.com>
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*/
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#include "cairo-test.h"
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#define SIZE 52
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#define OFFSET 5
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#define DISTANCE 10.25
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/*
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This test checks that boxes not aligned to pixels are drawn
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correctly.
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In particular the corners of the boxes are drawn incorrectly by
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cairo-image in cairo 1.10.0, because overlapping boxes are passed to
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a span converter which assumes disjoint boxes as input.
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This results in corners to be drawn with the wrong shade.
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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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int i;
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cairo_set_source_rgb (cr, 1, 1, 1);
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cairo_paint (cr);
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cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
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cairo_set_source_rgb (cr, 0, 0, 0);
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cairo_set_line_width (cr, 4);
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cairo_translate (cr, 2*OFFSET, 2*OFFSET);
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for (i = 0; i < 4; i++) {
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double x = i * DISTANCE;
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cairo_move_to (cr, x, -OFFSET-0.75);
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cairo_line_to (cr, x, SIZE-3*OFFSET-0.25);
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cairo_move_to (cr, -OFFSET-0.75, x);
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cairo_line_to (cr, SIZE-3*OFFSET-0.25, x);
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}
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cairo_stroke (cr);
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return CAIRO_TEST_SUCCESS;
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}
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static cairo_test_status_t
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aligned (cairo_t *cr, int width, int height)
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{
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cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);
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return draw (cr, width, height);
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}
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CAIRO_TEST (rectilinear_grid,
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"Test rectilinear rasterizer (covering partial pixels)",
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"rectilinear", /* keywords */
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NULL, /* requirements */
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SIZE, SIZE,
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NULL, draw)
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CAIRO_TEST (a1_rectilinear_grid,
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"Test rectilinear rasterizer (covering whole pixels)",
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"rectilinear", /* keywords */
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"target=raster", /* requirements */
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SIZE, SIZE,
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NULL, aligned)
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