2018-01-27 11:12:32 -08:00
|
|
|
#include <SDL2/SDL.h>
|
2018-04-29 06:49:25 -07:00
|
|
|
#include <string.h>
|
2018-01-27 11:12:32 -08:00
|
|
|
|
2018-04-29 06:58:09 -07:00
|
|
|
#include "color.h"
|
2018-01-27 11:12:32 -08:00
|
|
|
|
2018-11-12 04:08:57 -08:00
|
|
|
Color rgba(float r, float g, float b, float a)
|
2018-01-27 11:12:32 -08:00
|
|
|
{
|
2018-08-18 10:03:01 -07:00
|
|
|
const Color result = {
|
2018-01-27 11:12:32 -08:00
|
|
|
.r = r,
|
|
|
|
.g = g,
|
|
|
|
.b = b,
|
|
|
|
.a = a
|
|
|
|
};
|
|
|
|
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
2018-02-02 09:29:59 -08:00
|
|
|
static Uint8 hex2dec_digit(char c)
|
|
|
|
{
|
|
|
|
if (c >= '0' && c <= '9') {
|
|
|
|
return (Uint8) (c - '0');
|
|
|
|
}
|
|
|
|
|
|
|
|
if (c >= 'A' && c <= 'F') {
|
|
|
|
return (Uint8) (10 + c - 'A');
|
|
|
|
}
|
|
|
|
|
|
|
|
if (c >= 'a' && c <= 'f') {
|
|
|
|
return (Uint8) (10 + c - 'a');
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static Uint8 parse_color_component(const char *component)
|
|
|
|
{
|
|
|
|
return (Uint8) (hex2dec_digit(component[0]) * 16 + hex2dec_digit(component[1]));
|
|
|
|
}
|
|
|
|
|
2018-11-12 04:12:17 -08:00
|
|
|
Color hexstr(const char *hexstr)
|
2018-02-02 09:29:59 -08:00
|
|
|
{
|
|
|
|
if (strlen(hexstr) != 6) {
|
2018-11-12 04:08:57 -08:00
|
|
|
return rgba(0.0f, 0.0f, 0.0f, 1.0f);
|
2018-02-02 09:29:59 -08:00
|
|
|
}
|
|
|
|
|
2018-11-12 04:11:13 -08:00
|
|
|
return rgba(
|
|
|
|
parse_color_component(hexstr) / 255.0f,
|
|
|
|
parse_color_component(hexstr + 2) / 255.0f,
|
|
|
|
parse_color_component(hexstr + 4) / 255.0f,
|
|
|
|
1.0f);
|
2018-02-02 09:29:59 -08:00
|
|
|
}
|
|
|
|
|
2018-08-18 10:03:01 -07:00
|
|
|
SDL_Color color_for_sdl(Color color)
|
2018-01-27 11:12:32 -08:00
|
|
|
{
|
|
|
|
const SDL_Color result = {
|
|
|
|
.r = (Uint8)roundf(color.r * 255.0f),
|
|
|
|
.g = (Uint8)roundf(color.g * 255.0f),
|
|
|
|
.b = (Uint8)roundf(color.b * 255.0f),
|
|
|
|
.a = (Uint8)roundf(color.a * 255.0f)
|
|
|
|
};
|
|
|
|
|
|
|
|
return result;
|
|
|
|
}
|
2018-01-27 11:35:15 -08:00
|
|
|
|
2018-08-18 10:03:01 -07:00
|
|
|
Color color_desaturate(Color c)
|
2018-01-27 11:35:15 -08:00
|
|
|
{
|
|
|
|
const float k = (c.r + c.g + c.b) / 3.0f;
|
2018-11-12 04:08:57 -08:00
|
|
|
return rgba(k, k, k, c.a);
|
2018-01-27 11:35:15 -08:00
|
|
|
}
|
2018-04-29 13:57:42 -07:00
|
|
|
|
2018-08-18 10:03:01 -07:00
|
|
|
Color color_darker(Color c, float d)
|
2018-04-29 13:57:42 -07:00
|
|
|
{
|
2018-11-12 04:08:57 -08:00
|
|
|
return rgba(fmaxf(c.r - d, 0.0f),
|
|
|
|
fmaxf(c.g - d, 0.0f),
|
|
|
|
fmaxf(c.b - d, 0.0f),
|
|
|
|
c.a);
|
2018-04-29 13:57:42 -07:00
|
|
|
}
|