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#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "util.h"
char *color_to_string(color_t *color)
{
unsigned int r = color->r * 255,
g = color->g * 255,
b = color->b * 255,
a = color->a * 255;
char buffer[32];
int n = snprintf(buffer, 32, "#%02x%02x%02x%02x", r, g, b, a);
return strslice(buffer, 0, n);
}
void color_print(FILE *stream, color_t *color)
{
unsigned int r = color->r * 255,
g = color->g * 255,
b = color->b * 255,
a = color->a * 255;
fprintf(stream, "#%02x%02x%02x%02x", r, g, b, a);
}
struct timespec timespec_diff(struct timespec a, struct timespec b)
{
bool over = (b.tv_nsec - a.tv_nsec) < 0;
struct timespec diff = {
.tv_sec = b.tv_sec - a.tv_sec - over,
.tv_nsec = b.tv_nsec - a.tv_nsec + over * 1000000000ul,
};
return diff;
}
bool timespec_greater(struct timespec a, struct timespec b)
{
return a.tv_sec > b.tv_sec
|| (a.tv_sec == b.tv_sec && a.tv_nsec > b.tv_nsec);
}
void timespec_print(FILE *stream, struct timespec *ts)
{
fprintf(stream, "%ld.%.9ld", ts->tv_sec, ts->tv_nsec);
}
bool check_rect(int px, int py, int x, int y, int w, int h)
{
return px >= x && px <= x + w && py >= y && py <= y + h;
}
bool check_circle(int px, int py, int x, int y, int r)
{
int dx = x - px;
int dy = y - py;
return (dx * dx + dy * dy) <= r * r;
}
bool check_capsule(int px, int py, int x, int y, int w, int h)
{
assert(w >= h);
int radius = h / 2;
// Trivial case
if (w == h)
return check_circle(px, py, x + radius, y + radius, radius);
// General case
return check_circle(px, py, x + radius, y + radius, radius)
|| check_circle(px, py, x + w - radius, y + radius, radius)
|| check_rect(px, py, x + radius, y, w - 2 * radius, h);
}
char *strslice(const char *string, size_t start, size_t end)
{
if (string == NULL)
return NULL;
char *result = malloc(end - start + 1);
memcpy(result, string + start, end - start);
result[end - start] = '\0';
return result;
}
char *strcopy(const char *string)
{
if (string == NULL)
return NULL;
return strslice(string, 0, strlen(string));
}
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