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Frame internal radius

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This commit is contained in:
Nikita Zlobin 2020-05-06 22:26:30 +05:00
parent dcf060effa
commit 5fd090e618
1 changed files with 19 additions and 1 deletions
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20
src/draw.c
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@ -454,6 +454,7 @@ static cairo_surface_t *render_background(cairo_surface_t *srf,
int *ret_width)
{
int x = 0;
int radius_int = corner_radius;
cairo_t *c = cairo_create(srf);
@ -483,10 +484,27 @@ static cairo_surface_t *render_background(cairo_surface_t *srf,
height -= settings.frame_width;
else
height -= settings.separator_height;
/* Attempt to make internal radius more organic.
* Simple r-w is not enough for too small r/w ratio.
* simplifications: r/2 == r - w + w*w / (r * 2) with (w == r)
**/
{ const int s = 2 << (sizeof(int) * 8 / 4); // Integer precision scaler
int h, w, r, r1, r2;
h = s * height;
r = s * corner_radius;
w = s * settings.frame_width;
r1 = r - w + w * w / (r * 2); // w < r;
r2 = r * h / (h + (w - r) * 2); // w >= r
radius_int = (r > w) ? r1 : (r / 2 < r2) ? r / 2 : r2;
radius_int /= s;
}
}
cairo_set_source_rgb(c, cl->bg.r, cl->bg.g, cl->bg.b);
draw_rounded_rect(c, x, y, width, height, corner_radius, first, last);
draw_rounded_rect(c, x, y, width, height, radius_int, first, last);
cairo_fill(c);
if ( settings.sep_color.type != SEP_FRAME