diff options
Diffstat (limited to 'libs/cairo-1.16.0/test/dash-offset.c')
| -rw-r--r-- | libs/cairo-1.16.0/test/dash-offset.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/test/dash-offset.c b/libs/cairo-1.16.0/test/dash-offset.c new file mode 100644 index 0000000..f4269ee --- /dev/null +++ b/libs/cairo-1.16.0/test/dash-offset.c @@ -0,0 +1,83 @@ +/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */ +/* + * Copyright 2009 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" + +/* Lengths of the dashes of the dash patterns */ +static const double dashes[] = { 2, 2, 4, 4 }; +/* Dash offset in userspace units + * They always grow by 2, so the dash pattern is + * should be shifted by the same amount each time */ +static const double frac_offset[] = { 0, 2, 4, 6 }; +/* Dash offset relative to the whole dash pattern + * This corresponds to the non-inverted part only if + * the dash pattern has odd length, so the expected result + * is the same for every int_offset if the pattern has + * even length, and inverted each time (or shifted by half + * period, which is the same) if the pattern has odd length. */ +static const double int_offset[] = { -2, -1, 0, 1, 2 }; + +#define PAD 6 +#define STROKE_LENGTH 32 +#define IMAGE_WIDTH (PAD + (STROKE_LENGTH + PAD) * ARRAY_LENGTH (dashes)) +#define IMAGE_HEIGHT (PAD + PAD * ARRAY_LENGTH (int_offset) + PAD * ARRAY_LENGTH (frac_offset) * ARRAY_LENGTH (int_offset)) + + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + double total; + size_t i, j, k; + + cairo_set_source_rgb (cr, 1, 1, 1); + cairo_paint (cr); + + cairo_set_source_rgb (cr, 0, 0, 0); + cairo_set_line_width (cr, 2); + + total = 0.0; + for (k = 0; k < ARRAY_LENGTH (dashes); ++k) { + total += dashes[k]; + for (i = 0; i < ARRAY_LENGTH (frac_offset); ++i) { + for (j = 0; j < ARRAY_LENGTH (int_offset); ++j) { + cairo_set_dash (cr, dashes, k + 1, frac_offset[i] + total * int_offset[j]); + cairo_move_to (cr, (STROKE_LENGTH + PAD) * k + PAD, PAD * (i + j + ARRAY_LENGTH (frac_offset) * j + 1)); + cairo_line_to (cr, (STROKE_LENGTH + PAD) * (k + 1), PAD * (i + j + ARRAY_LENGTH (frac_offset) * j + 1)); + cairo_stroke (cr); + } + } + } + + return CAIRO_TEST_SUCCESS; +} + +CAIRO_TEST (dash_offset, + "Tests dashes of different length with various offsets", + "stroke, dash", /* keywords */ + NULL, /* requirements */ + IMAGE_WIDTH, IMAGE_HEIGHT, + NULL, draw) |