diff options
Diffstat (limited to 'libs/cairo-1.16.0/test/drunkard-tails.c')
| -rw-r--r-- | libs/cairo-1.16.0/test/drunkard-tails.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/test/drunkard-tails.c b/libs/cairo-1.16.0/test/drunkard-tails.c new file mode 100644 index 0000000..f55c7be --- /dev/null +++ b/libs/cairo-1.16.0/test/drunkard-tails.c @@ -0,0 +1,135 @@ +/* + * Copyright © 2011 Intel Corporation + * + * 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: Chris Wilson <chris@chris-wilson.co.uk> + */ + +#include "cairo-test.h" + +#define LINE_WIDTH 10. +#define SIZE (5 * LINE_WIDTH) +#define PAD (3 * LINE_WIDTH) + +static uint32_t state; + +static double +uniform_random (double minval, double maxval) +{ + static uint32_t const poly = 0x9a795537U; + uint32_t n = 32; + while (n-->0) + state = 2*state < state ? (2*state ^ poly) : 2*state; + return minval + state * (maxval - minval) / 4294967296.0; +} + +static void +make_path (cairo_t *cr) +{ + int i; + + state = 0xdeadbeef; + + cairo_move_to (cr, SIZE/2, SIZE/2); + for (i = 0; i < 200; i++) { + double theta = uniform_random (-M_PI, M_PI); + cairo_rel_line_to (cr, + cos (theta) * LINE_WIDTH / 4, + sin (theta) * LINE_WIDTH / 4); + } +} + +static void +draw_caps_joins (cairo_t *cr) +{ + cairo_save (cr); + + cairo_translate (cr, PAD, PAD); + + cairo_reset_clip (cr); + cairo_rectangle (cr, 0, 0, SIZE, SIZE); + cairo_clip (cr); + + make_path (cr); + cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT); + cairo_set_line_join (cr, CAIRO_LINE_JOIN_BEVEL); + cairo_stroke (cr); + + cairo_translate (cr, SIZE + PAD, 0.); + + cairo_reset_clip (cr); + cairo_rectangle (cr, 0, 0, SIZE, SIZE); + cairo_clip (cr); + + make_path (cr); + cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND); + cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND); + cairo_stroke (cr); + + cairo_translate (cr, SIZE + PAD, 0.); + + cairo_reset_clip (cr); + cairo_rectangle (cr, 0, 0, SIZE, SIZE); + cairo_clip (cr); + + make_path (cr); + cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE); + cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER); + cairo_stroke (cr); + + cairo_restore (cr); +} + +static cairo_test_status_t +draw (cairo_t *cr, int width, int height) +{ + /* We draw in the default black, so paint white first. */ + cairo_save (cr); + cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */ + cairo_paint (cr); + cairo_restore (cr); + + cairo_set_line_width (cr, LINE_WIDTH); + + draw_caps_joins (cr); + + cairo_save (cr); + /* and reflect to generate the opposite vertex ordering */ + cairo_translate (cr, 0, height); + cairo_scale (cr, 1, -1); + + draw_caps_joins (cr); + cairo_restore (cr); + + cairo_translate (cr, 0, SIZE + PAD); + + return CAIRO_TEST_SUCCESS; +} + +CAIRO_TEST (drunkard_tails, + "Test caps and joins on short tail segments", + "stroke, cap, join", /* keywords */ + NULL, /* requirements */ + 3 * (PAD + SIZE) + PAD, + 2 * (PAD + SIZE) + PAD, + NULL, draw) + |