Grcov report - rectilinear-grid.c

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/* -*- 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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 * 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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 * 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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 * 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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 * 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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    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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    cairo_stroke (cr);

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    return CAIRO_TEST_SUCCESS;

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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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    cairo_set_antialias (cr, CAIRO_ANTIALIAS_NONE);

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    return draw (cr, width, height);

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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)