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draw tri: fix pixel overwrite with oapcity (from #1091)

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Gabor Kiss-Vamosi
2019-06-04 15:20:22 +02:00
parent 33bb0d8004
commit e01577845a
1 changed files with 18 additions and 27 deletions
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45
src/lv_draw/lv_draw_triangle.c
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@@ -27,7 +27,6 @@ static void point_swap(lv_point_t * p1, lv_point_t * p2);
/**********************
* STATIC VARIABLES
**********************/
static uint8_t corr_value;
/**********************
* MACROS
@@ -47,6 +46,7 @@ static uint8_t corr_value;
void lv_draw_triangle(const lv_point_t * points, const lv_area_t * mask, const lv_style_t * style,
lv_opa_t opa_scale)
{
/*Return is the triangle is degenerated*/
if(points[0].x == points[1].x && points[0].y == points[1].y) return;
if(points[1].x == points[2].x && points[1].y == points[2].y) return;
@@ -65,27 +65,19 @@ void lv_draw_triangle(const lv_point_t * points, const lv_area_t * mask, const l
lv_coord_t y_min = LV_MATH_MIN(LV_MATH_MIN(points[0].y, points[1].y), points[2].y);
lv_coord_t y_max = LV_MATH_MAX(LV_MATH_MAX(points[0].y, points[1].y), points[2].y);
if(opa < LV_OPA_MAX) {
/*Simply draw the triangles with opacity */
corr_value = 1;
/* Draw the tall rectangles from vertical lines
* and from the flat triangles from horizontal lines
* to minimize the number of lines.
* Some pixels are overdrawn on the common edges of the triangles
* so use it only if the triangle has no opacity*/
/* Draw from horizontal lines*/
if(x_max - x_min < y_max - y_min) {
tri_draw_tall(points, mask, style, opa);
} else {
/* Draw the tall rectangles from vertical lines
* and from the flat triangles from horizontal lines
* to minimize the number of lines.
* Some pixels are overdrawn on the common edges of the triangles
* so use it only if the triangle has no opacity*/
corr_value = 0;
/* Draw from horizontal lines*/
if(x_max - x_min < y_max - y_min) {
tri_draw_tall(points, mask, style, opa);
}
/*Else flat so draw from vertical lines*/
else {
tri_draw_flat(points, mask, style, opa);
}
}
/*Else flat so draw from vertical lines*/
else {
tri_draw_flat(points, mask, style, opa);
}
}
@@ -114,7 +106,6 @@ void lv_draw_polygon(const lv_point_t * points, uint32_t point_cnt, const lv_are
tri[2].y = points[i+1].y;
lv_draw_triangle(tri, mask, style, opa_scale);
}
}
/**********************
@@ -193,10 +184,10 @@ void tri_draw_flat(const lv_point_t * points, const lv_area_t * mask, const lv_s
/* Get the area of a line.
* Adjust it a little bit to perfectly match (no redrawn pixels) with the adjacent triangles*/
draw_area.x1 = LV_MATH_MIN(act_area.x1, act_area.x2);
draw_area.x2 = LV_MATH_MAX(act_area.x1, act_area.x2) - corr_value;
draw_area.y1 = LV_MATH_MIN(act_area.y1, act_area.y2);
draw_area.y2 = LV_MATH_MAX(act_area.y1, act_area.y2);
draw_area.x1 = LV_MATH_MIN(act_area.x1, act_area.x2) + 1;
draw_area.x2 = LV_MATH_MAX(act_area.x1, act_area.x2);
draw_area.y1 = LV_MATH_MIN(act_area.y1, act_area.y2) - 1;
draw_area.y2 = LV_MATH_MAX(act_area.y1, act_area.y2) - 1;
lv_draw_fill(&draw_area, mask, style->body.main_color, opa);
@@ -298,7 +289,7 @@ void tri_draw_tall(const lv_point_t * points, const lv_area_t * mask, const lv_s
draw_area.x1 = LV_MATH_MIN(act_area.x1, act_area.x2);
draw_area.x2 = LV_MATH_MAX(act_area.x1, act_area.x2);
draw_area.y1 = LV_MATH_MIN(act_area.y1, act_area.y2);
draw_area.y2 = LV_MATH_MAX(act_area.y1, act_area.y2) - corr_value;
draw_area.y2 = LV_MATH_MAX(act_area.y1, act_area.y2) - 1;
lv_draw_fill(&draw_area, mask, style->body.main_color, opa);