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/*
* 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);
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;
}
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