keyframe_fade.h

#ifndef KEYFRAME_FADE_H
#define KEYFRAME_FADE_H
 
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
 
#include "color.h"
#include "keyframes.h"
 
#define KEYFRAME_FADE_COLORS_INPUT_MAX_LENGTH (15)
 
#define KEYFRAME_FADE_COLORS_MAX_LENGTH  (KEYFRAME_FADE_COLORS_INPUT_MAX_LENGTH + 1)
 
 
typedef enum e_fade_type
{
    FADE_TYPE_STEP,  
    FADE_TYPE_CUBIC  
} fade_type_t;
 
typedef enum e_fade_axis
{
    FADE_AXIS_NONE = 0,         
    FADE_AXIS_HUE = (1U << 0),  
    FADE_AXIS_SAT = (1U << 1),  
    FADE_AXIS_VAL = (1U << 2)   
} fade_axis_t;
 
typedef struct st_point
{
    float x; 
    float y; 
} point_t;
 
typedef struct st_cubic_bezier
{
    point_t p1; 
    point_t p2; 
} cubic_bezier_t;
 
typedef struct st_keyframe_fade
{
    keyframe_base_t base;
    struct
    {
        float          period;       
        fade_type_t    fade_type;    
        cubic_bezier_t curve;        
        bool           push_current; 
        uint8_t        colors_len;   
        color_hsv_t    colors[KEYFRAME_FADE_COLORS_MAX_LENGTH]; 
    } args;
    struct
    {
        fade_axis_t fade_axis;   
        timestep_t  pair_period; 
        timestep_t  finish_time; 
        uint8_t     pair_index;  
        point_t     curr_b_info; 
        framerate_t framerate;   
    } state;
} keyframe_fade_t;
 
extern const cubic_bezier_t cb_linear;
extern const cubic_bezier_t cb_ease;
extern const cubic_bezier_t cb_ease_in;
extern const cubic_bezier_t cb_ease_out;
extern const cubic_bezier_t cb_ease_in_out; 
 
#endif