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improve circle anti-alaisins

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This commit is contained in:
Gabor Kiss-Vamosi
2019-03-27 08:36:55 +01:00
parent 881d6c060f
commit ed9a1f3df5
1 changed files with 22 additions and 8 deletions
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30
src/lv_draw/lv_draw_rect.c
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@@ -13,7 +13,7 @@
/*********************
* DEFINES
*********************/
#define CIRCLE_AA_NON_LINEAR_OPA_THRESHOLD 5 /*Circle segment greater then this value will be anti-aliased by a non-linear (cos) opacity mapping*/
#define CIRCLE_AA_NON_LINEAR_OPA_THRESHOLD 1 /*Circle segment greater then this value will be anti-aliased by a non-linear (cos) opacity mapping*/
#define SHADOW_OPA_EXTRA_PRECISION 8 /*Calculate with 2^x bigger shadow opacity values to avoid rounding errors*/
#define SHADOW_BOTTOM_AA_EXTRA_RADIUS 3 /*Add extra radius with LV_SHADOW_BOTTOM to cover anti-aliased corners*/
@@ -1419,16 +1419,30 @@ static uint16_t lv_draw_cont_radius_corr(uint16_t r, lv_coord_t w, lv_coord_t h)
*/
static lv_opa_t antialias_get_opa_circ(lv_coord_t seg, lv_coord_t px_id, lv_opa_t opa)
{
static const lv_opa_t opa_map[8] = {250, 242, 221, 196, 163, 122, 74, 18};
/*Empirical non-linear values anti-aliasing values*/
static const lv_opa_t opa_map2[2] = {210, 80};
static const lv_opa_t opa_map3[3] = {230, 150, 60};
static const lv_opa_t opa_map4[4] = {235, 185, 125, 50};
static const lv_opa_t opa_map8[8] = {250, 242, 219, 191, 158, 117, 76, 40};
if(seg == 0) return LV_OPA_TRANSP;
else if(seg == 1) return LV_OPA_80;
else {
#if CIRCLE_AA_NON_LINEAR_OPA_THRESHOLD < 1
if(seg == 1) return 170;
#endif
uint8_t id = (uint32_t)((uint32_t)px_id * (sizeof(opa_map) - 1)) / (seg - 1);
return (uint32_t)((uint32_t) opa_map[id] * opa) >> 8;
#if CIRCLE_AA_NON_LINEAR_OPA_THRESHOLD < 2
if(seg == 2) return (opa_map2[px_id] * opa) >> 8;
#endif
}
#if CIRCLE_AA_NON_LINEAR_OPA_THRESHOLD < 3
if(seg == 3) return (opa_map3[px_id] * opa) >> 8;
#endif
#if CIRCLE_AA_NON_LINEAR_OPA_THRESHOLD < 4
if(seg == 4) return (opa_map4[px_id] * opa) >> 8;
#endif
uint8_t id = (uint32_t)((uint32_t)px_id * (sizeof(opa_map8) - 1)) / (seg - 1);
return (uint32_t)((uint32_t) opa_map8[id] * opa) >> 8;
}