98 lines
3.5 KiB
C
98 lines
3.5 KiB
C
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/**
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* @file lv_draw_sw_gradient.h
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*
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*/
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#ifndef LV_DRAW_SW_GRADIENT_H
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#define LV_DRAW_SW_GRADIENT_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*********************
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* INCLUDES
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*********************/
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#include "../../misc/lv_color.h"
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#include "../../misc/lv_style.h"
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#include "lv_draw_sw_dither.h"
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/*********************
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* DEFINES
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*********************/
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#if LV_GRADIENT_MAX_STOPS < 2
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#error LVGL needs at least 2 stops for gradients. Please increase the LV_GRADIENT_MAX_STOPS
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#endif
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/**********************
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* TYPEDEFS
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**********************/
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#if _DITHER_GRADIENT
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typedef lv_color32_t lv_grad_color_t;
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#else
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typedef lv_color_t lv_grad_color_t;
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#endif
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/** To avoid recomputing gradient for each draw operation,
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* it's possible to cache the computation in this structure instance.
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* Whenever possible, this structure is reused instead of recomputing the gradient map */
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typedef struct _lv_gradient_cache_t {
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uint32_t key; /**< A discriminating key that's built from the drawing operation.
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* If the key does not match, the cache item is not used */
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uint32_t life : 30; /**< A life counter that's incremented on usage. Higher counter is
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* less likely to be evicted from the cache */
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uint32_t filled : 1; /**< Used to skip dithering in it if already done */
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uint32_t not_cached: 1; /**< The cache was too small so this item is not managed by the cache*/
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lv_color_t * map; /**< The computed gradient low bitdepth color map, points into the
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* cache's buffer, no free needed */
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lv_coord_t alloc_size; /**< The map allocated size in colors */
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lv_coord_t size; /**< The computed gradient color map size, in colors */
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#if _DITHER_GRADIENT
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lv_color32_t * hmap; /**< If dithering, we need to store the current, high bitdepth gradient
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* map too, points to the cache's buffer, no free needed */
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#if LV_DITHER_ERROR_DIFFUSION == 1
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lv_scolor24_t * error_acc; /**< Error diffusion dithering algorithm requires storing the last error
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* drawn, points to the cache's buffer, no free needed */
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lv_coord_t w; /**< The error array width in pixels */
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#endif
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#endif
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} lv_grad_t;
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/**********************
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* PROTOTYPES
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**********************/
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/** Compute the color in the given gradient and fraction
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* Gradient are specified in a virtual [0-255] range, so this function scales the virtual range to the given range
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* @param dsc The gradient descriptor to use
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* @param range The range to use in computation.
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* @param frac The current part used in the range. frac is in [0; range]
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*/
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LV_ATTRIBUTE_FAST_MEM lv_grad_color_t lv_gradient_calculate(const lv_grad_dsc_t * dsc, lv_coord_t range,
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lv_coord_t frac);
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/**
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* Set the gradient cache size
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* @param max_bytes Max cahce size
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*/
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void lv_gradient_set_cache_size(size_t max_bytes);
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/** Free the gradient cache */
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void lv_gradient_free_cache(void);
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/** Get a gradient cache from the given parameters */
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lv_grad_t * lv_gradient_get(const lv_grad_dsc_t * gradient, lv_coord_t w, lv_coord_t h);
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/**
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* Clean up the gradient item after it was get with `lv_grad_get_from_cache`.
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* @param grad pointer to a gradient
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*/
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void lv_gradient_cleanup(lv_grad_t * grad);
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#ifdef __cplusplus
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} /*extern "C"*/
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#endif
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#endif /*LV_DRAW_GRADIENT_H*/
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