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lv_draw_shadow fixed

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This commit is contained in:
Gabor Kiss-Vamosi
2018-08-09 07:20:23 +02:00
parent 31ad141f7e
commit 8fbf1267a5
1 changed files with 19 additions and 9 deletions
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28
lv_draw/lv_draw_rect.c
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@@ -1064,6 +1064,17 @@ static void lv_draw_shadow(const lv_area_t * coords, const lv_area_t * mask, con
static void lv_draw_shadow_full(const lv_area_t * coords, const lv_area_t * mask, const lv_style_t * style, lv_opa_t opa_scale)
{
/* KNOWN ISSUE
* The algorithm calculates the shadow only above the middle point of the radius (speaking about the left top corner).
* It causes an error because it doesn't consider how long the straight edge is which effects the value of bottom of the corner shadow.
* In addition the straight shadow is drawn from the middles point of the radius however
* the ends of the straight parts still should be effected by the corner shadow.
* It also causes an issue in opacity. A smaller radius means smaller average shadow opacity.
* The solution should be to start `line` from `- swidth` and handle if the straight part is short (or zero) and the value is taken from
* the other corner. `col` also should start from `- swidth`
*/
lv_coord_t radius = style->body.radius;
lv_coord_t swidth = style->body.shadow.width;
@@ -1322,7 +1333,6 @@ static void lv_draw_shadow_bottom(const lv_area_t * coords, const lv_area_t * ma
static void lv_draw_shadow_full_straight(const lv_area_t * coords, const lv_area_t * mask, const lv_style_t * style, const lv_opa_t * map)
{
return;
lv_coord_t radius = style->body.radius;
lv_coord_t swidth = style->body.shadow.width;// + LV_ANTIALIAS;
lv_coord_t width = lv_area_get_width(coords);
@@ -1333,26 +1343,26 @@ static void lv_draw_shadow_full_straight(const lv_area_t * coords, const lv_area
lv_area_t right_area;
right_area.x1 = coords->x2 + 1 - LV_ANTIALIAS;
right_area.y1 = coords->y1 + radius + 1;
right_area.y1 = coords->y1 + radius + LV_ANTIALIAS;
right_area.x2 = right_area.x1;
right_area.y2 = coords->y2 - radius - 1;
right_area.y2 = coords->y2 - radius - LV_ANTIALIAS;
lv_area_t left_area;
left_area.x1 = coords->x1 - 1 + LV_ANTIALIAS;
left_area.y1 = coords->y1 + radius + 1;
left_area.y1 = coords->y1 + radius + LV_ANTIALIAS;
left_area.x2 = left_area.x1;
left_area.y2 = coords->y2 - radius - 1;
left_area.y2 = coords->y2 - radius - LV_ANTIALIAS;
lv_area_t top_area;
top_area.x1 = coords->x1 + radius;
top_area.x1 = coords->x1 + radius + LV_ANTIALIAS;
top_area.y1 = coords->y1 - 1 + LV_ANTIALIAS;
top_area.x2 = coords->x2 - radius;
top_area.x2 = coords->x2 - radius - LV_ANTIALIAS;
top_area.y2 = top_area.y1;
lv_area_t bottom_area;
bottom_area.x1 = coords->x1 + radius;
bottom_area.x1 = coords->x1 + radius + LV_ANTIALIAS;
bottom_area.y1 = coords->y2 + 1 - LV_ANTIALIAS;
bottom_area.x2 = coords->x2 - radius;
bottom_area.x2 = coords->x2 - radius - LV_ANTIALIAS;
bottom_area.y2 = bottom_area.y1;
printf("shadow: ");