Grcov report - dash-offset.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 2009 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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/* Lengths of the dashes of the dash patterns */

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static const double dashes[] = { 2, 2, 4, 4 };

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/* Dash offset in userspace units

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 * They always grow by 2, so the dash pattern is

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 * should be shifted by the same amount each time */

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static const double frac_offset[] = { 0, 2, 4, 6 };

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/* Dash offset relative to the whole dash pattern

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 * This corresponds to the non-inverted part only if

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 * the dash pattern has odd length, so the expected result

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 * is the same for every int_offset if the pattern has

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 * even length, and inverted each time (or shifted by half

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 * period, which is the same) if the pattern has odd length. */

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static const double int_offset[] = { -2, -1, 0, 1, 2 };

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#define PAD 6

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#define STROKE_LENGTH 32

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#define IMAGE_WIDTH (PAD + (STROKE_LENGTH + PAD) * ARRAY_LENGTH (dashes))

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#define IMAGE_HEIGHT (PAD + PAD * ARRAY_LENGTH (int_offset) + PAD * ARRAY_LENGTH (frac_offset) * ARRAY_LENGTH (int_offset))

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static cairo_test_status_t

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3

draw (cairo_t *cr, int width, int height)

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    double total;

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    size_t i, j, k;

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3

    cairo_set_source_rgb (cr, 1, 1, 1);

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3

    cairo_paint (cr);

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3

    cairo_set_source_rgb (cr, 0, 0, 0);

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3

    cairo_set_line_width (cr, 2);

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3

    total = 0.0;

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    for (k = 0; k < ARRAY_LENGTH (dashes); ++k) {

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	total += dashes[k];

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	for (i = 0; i < ARRAY_LENGTH (frac_offset); ++i) {

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	    for (j = 0; j < ARRAY_LENGTH (int_offset); ++j) {

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		cairo_set_dash (cr, dashes, k + 1, frac_offset[i] + total * int_offset[j]);

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		cairo_move_to (cr, (STROKE_LENGTH + PAD) * k + PAD, PAD * (i + j + ARRAY_LENGTH (frac_offset) * j + 1));

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		cairo_line_to (cr, (STROKE_LENGTH + PAD) * (k + 1), PAD * (i + j + ARRAY_LENGTH (frac_offset) * j + 1));

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		cairo_stroke (cr);

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3

    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (dash_offset,

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	    "Tests dashes of different length with various offsets",

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	    "stroke, dash", /* keywords */

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	    NULL, /* requirements */

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	    IMAGE_WIDTH, IMAGE_HEIGHT,

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	    NULL, draw)