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experiemnt with more accurate lv_color_mix

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This commit is contained in:
Gabor Kiss-Vamosi 2020-03-26 08:58:16 +01:00
parent 8fe169981f
commit 23c2d804f0
2 changed files with 8 additions and 3 deletions
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7
src/lv_misc/lv_color.h
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@ -14,6 +14,7 @@ extern "C" {
* INCLUDES
*********************/
#include "../lv_conf_internal.h"
#include "lv_math.h"
/*Error checking*/
#if LV_COLOR_DEPTH == 24
@ -432,9 +433,9 @@ static inline lv_color_t lv_color_mix(lv_color_t c1, lv_color_t c2, uint8_t mix)
lv_color_t ret;
#if LV_COLOR_DEPTH != 1
/*LV_COLOR_DEPTH == 8, 16 or 32*/
LV_COLOR_SET_R(ret, (uint16_t)((uint16_t) LV_COLOR_GET_R(c1) * mix + LV_COLOR_GET_R(c2) * (255 - mix)) >> 8);
LV_COLOR_SET_G(ret, (uint16_t)((uint16_t) LV_COLOR_GET_G(c1) * mix + LV_COLOR_GET_G(c2) * (255 - mix)) >> 8);
LV_COLOR_SET_B(ret, (uint16_t)((uint16_t) LV_COLOR_GET_B(c1) * mix + LV_COLOR_GET_B(c2) * (255 - mix)) >> 8);
LV_COLOR_SET_R(ret, LV_MATH_UDIV255((uint16_t) LV_COLOR_GET_R(c1) * mix + LV_COLOR_GET_R(c2) * (255 - mix)));
LV_COLOR_SET_G(ret, LV_MATH_UDIV255((uint16_t) LV_COLOR_GET_G(c1) * mix + LV_COLOR_GET_G(c2) * (255 - mix)));
LV_COLOR_SET_B(ret, LV_MATH_UDIV255((uint16_t) LV_COLOR_GET_B(c1) * mix + LV_COLOR_GET_B(c2) * (255 - mix)));
LV_COLOR_SET_A(ret, 0xFF);
#else
/*LV_COLOR_DEPTH == 1*/

4
src/lv_misc/lv_math.h
View File

@ -28,6 +28,8 @@ extern "C" {
#define LV_MATH_ABS(x) ((x) > 0 ? (x) : (-(x)))
#define LV_MATH_UDIV255(x) ((uint32_t)((uint32_t) (x) * 0x8081) >> 0x17)
#define LV_IS_SIGNED(t) (((t)(-1)) < ((t) 0))
#define LV_UMAX_OF(t) (((0x1ULL << ((sizeof(t) * 8ULL) - 1ULL)) - 1ULL) | (0xFULL << ((sizeof(t) * 8ULL) - 4ULL)))
#define LV_SMAX_OF(t) (((0x1ULL << ((sizeof(t) * 8ULL) - 1ULL)) - 1ULL) | (0x7ULL << ((sizeof(t) * 8ULL) - 4ULL)))
@ -39,6 +41,8 @@ extern "C" {
#define LV_BEZIER_VAL_MAX 1024 /**< Max time in Bezier functions (not [0..1] to use integers) */
#define LV_BEZIER_VAL_SHIFT 10 /**< log2(LV_BEZIER_VAL_MAX): used to normalize up scaled values*/
/**********************
* TYPEDEFS
**********************/