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Diffstat (limited to 'test/test-bezier.c')
| -rw-r--r-- | test/test-bezier.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/test/test-bezier.c b/test/test-bezier.c new file mode 100644 index 0000000..9a6e59e --- /dev/null +++ b/test/test-bezier.c @@ -0,0 +1,206 @@ +/* + * Copyright © 2016 Red Hat, Inc. + * + * Permission to use, copy, modify, distribute, and sell this software + * and its documentation for any purpose is hereby granted without + * fee, provided that the above copyright notice appear in all copies + * and that both that copyright notice and this permission notice + * appear in supporting documentation, and that the name of Red Hat + * not be used in advertising or publicity pertaining to distribution + * of the software without specific, written prior permission. Red + * Hat makes no representations about the suitability of this software + * for any purpose. It is provided "as is" without express or implied + * warranty. + * + * THE AUTHORS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, + * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN + * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS + * OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, + * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN + * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +#include "bezier.h" + +#include <assert.h> +#include <string.h> +#include <stdio.h> + +static inline void +print_curve(int *bezier, size_t size) +{ + /* look at it with gnuplot, "plot 'output-file.txt'" */ + for (int i = 0; i < size; i++) + printf("%d %d\n", i, bezier[i]); +} + +static void +test_linear(void) +{ + const int size = 2048; + int bezier[size]; + + struct bezier_control_point controls[] = { + { 0.0, 0.0 }, + { 0.0, 0.0 }, + { 1.0, 1.0 }, + { 1.0, 1.0 } + }; + + cubic_bezier(controls, bezier, size); + + assert(bezier[0] == 0); + assert(bezier[size - 1] == size - 1); + + for (int x = 1; x < size; x++) + assert(bezier[x] == x); +} + +/* Center point pulled down towards X axis */ +static void +test_flattened(void) +{ + const int size = 2048; + int bezier[size]; + + struct bezier_control_point controls[] = { + { 0.0, 0.0 }, + { 0.1, 0.0 }, + { 1.0, 0.9 }, + { 1.0, 1.0 } + }; + + cubic_bezier(controls, bezier, size); + + assert(bezier[0] == 0); + assert(bezier[size - 1] == size - 1); + + for (int x = 1; x < size - 1; x++) { + assert(bezier[x] < x); + } +} + +/* Center point pulled up from X axis */ +static void +test_raised(void) +{ + const int size = 2048; + int bezier[size]; + + struct bezier_control_point controls[] = { + { 0.0, 0.0 }, + { 0.1, 0.4 }, + { 0.4, 1.0 }, + { 1.0, 1.0 } + }; + + cubic_bezier(controls, bezier, size); + + assert(bezier[0] == 0); + assert(bezier[size - 1] == size - 1); + + for (int x = 1; x < size; x++) + assert(bezier[x] >= x); + + for (int x = 10; x < size - 10; x++) + assert(bezier[x] > x); +} + +static void +test_windy(void) +{ + const int size = 2048; + int bezier[size]; + + struct bezier_control_point controls[] = { + { 0.0, 0.0 }, + { 0.0, 0.3 }, + { 1.0, 0.7 }, + { 1.0, 1.0 } + }; + + cubic_bezier(controls, bezier, size); + + assert(bezier[0] == 0); + assert(bezier[size - 1] == size - 1); + + for (int x = 1; x < size/2 - 20; x++) + assert(bezier[x] > x); + + for (int x = size/2 + 20; x < size - 1; x++) + assert(bezier[x] < x); +} + +static void +test_nonzero_x_linear(void) +{ + const int size = 2048; + int bezier[size]; + int x; + + struct bezier_control_point controls[] = { + { 0.2, 0.0 }, + { 0.2, 0.0 }, + { 0.8, 1.0 }, + { 0.8, 1.0 } + }; + + cubic_bezier(controls, bezier, size); + + x = 0; + do { + assert(bezier[x] == 0); + } while (++x < size * 0.2 - 1); + + /* ppc64le, ppc64, aarch64 have different math results at -O2, + resulting in one extra zero at the beginning of the array. + some other numbers are different too but within the error + margin (#99992) */ + if (bezier[x] == 0) + x++; + + do { + assert(bezier[x] > bezier[x-1]); + } while (++x < size * 0.8 - 1); + + do { + assert(bezier[x] == size - 1); + } while (++x < size); +} + +static void +test_nonzero_y_linear(void) +{ + const int size = 2048; + int bezier[size]; + + struct bezier_control_point controls[] = { + { 0.0, 0.2 }, + { 0.0, 0.2 }, + { 1.0, 0.8 }, + { 1.0, 0.8 } + }; + + cubic_bezier(controls, bezier, size); + + assert(bezier[0] == (int)(size * 0.2)); + + for (int x = 1; x < size; x++) { + assert(bezier[x - 1] <= bezier[x]); + assert(bezier[x] >= (int)(size * 0.2)); + } +} + +int +main(int argc, char **argv) +{ + test_linear(); + test_flattened(); + test_raised(); + test_windy(); + test_nonzero_x_linear(); + test_nonzero_y_linear(); + + return 0; +} |