lv_draw_sw_gradient.h

Go to the documentation of this file.

 
#ifndef LV_DRAW_SW_GRADIENT_H
#define LV_DRAW_SW_GRADIENT_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
/*********************
 *      INCLUDES
 *********************/
#include "../../misc/lv_color.h"
#include "../../misc/lv_style.h"
#include "lv_draw_sw_dither.h"
 
/*********************
 *      DEFINES
 *********************/
#if LV_GRADIENT_MAX_STOPS < 2
#error LVGL needs at least 2 stops for gradients. Please increase the LV_GRADIENT_MAX_STOPS
#endif
 
 
/**********************
 *      TYPEDEFS
 **********************/
#if _DITHER_GRADIENT
typedef lv_color32_t lv_grad_color_t;
#else
typedef lv_color_t lv_grad_color_t;
#endif
 
typedef struct _lv_gradient_cache_t {
    uint32_t        key;          
    uint32_t        life : 30;    
    uint32_t        filled : 1;   
    uint32_t        not_cached: 1; 
    lv_color_t   *  map;          
    lv_coord_t      alloc_size;   
    lv_coord_t      size;         
#if _DITHER_GRADIENT
    lv_color32_t  * hmap;         
#if LV_DITHER_ERROR_DIFFUSION == 1
    lv_scolor24_t * error_acc;    
    lv_coord_t      w;            
#endif
#endif
} lv_grad_t;
 
 
/**********************
 *      PROTOTYPES
 **********************/
LV_ATTRIBUTE_FAST_MEM lv_grad_color_t lv_gradient_calculate(const lv_grad_dsc_t * dsc, lv_coord_t range,
                                                            lv_coord_t frac);
 
void lv_gradient_set_cache_size(size_t max_bytes);
 
void lv_gradient_free_cache(void);
 
lv_grad_t * lv_gradient_get(const lv_grad_dsc_t * gradient, lv_coord_t w, lv_coord_t h);
 
void lv_gradient_cleanup(lv_grad_t * grad);
 
#ifdef __cplusplus
} /*extern "C"*/
#endif
 
#endif /*LV_DRAW_GRADIENT_H*/