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box-drawing: wip: LIGHT ARC: U+256d-U+2570

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Daniel Eklöf 2020-12-31 17:22:14 +01:00
parent bd42986a8b
commit c120e0c84f
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GPG key ID: 5BBD4992C116573F
1 changed files with 95 additions and 6 deletions
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101
box-drawing.c
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@ -1037,6 +1037,100 @@ draw_box_drawings_double_vertical_and_horizontal(uint8_t *buf, int width, int he
vline(hmid + 2 * thick, height, vmid + 2 * thick, thick);
}
#define cubic_bezier_x(t) __extension__ \
({ \
double tm1 = 1 - t; \
double tm1_3 = tm1 * tm1 * tm1; \
double t_3 = t * t * t; \
tm1_3 * start_x + 3 * t * tm1 * (tm1 * c1_x + t * c2_x) + t_3 * end_x; \
})
#define cubic_bezier_y(t) __extension__ \
({ \
double tm1 = 1 - t; \
double tm1_3 = tm1 * tm1 * tm1; \
double t_3 = t * t * t; \
tm1_3 * start_y + 3 * t * tm1 * (tm1 * c1_y + t * c2_y) + t_3 * end_y; \
})
static void
draw_box_drawings_light_arc(wchar_t wc, uint8_t *buf, int width, int height, int stride, int dpi)
{
int thick = thickness(LIGHT, dpi);
int delta = thick / 2;
int extra = thick % 2;
int hw = (width - thick) / 2;
int hh = (height - thick) / 2;
int start_x, start_y, end_x, end_y, c1_x, c1_y, c2_x, c2_y;
if (wc == L'╭') {
start_x = hw;
start_y = height - 1;
end_x = width - 1;
end_y = hh;
c1_x = hw;
c1_y = round(3. * height / 4.);
c2_x = hw;
c2_y = hh + 1;
} else if (wc == L'╮') {
start_x = 0;
start_y = hh;
end_x = hw;
end_y = height - 1;
c1_x = hw + 1;
c1_y = hh + 1;
c2_x = hw + 1;
c2_y = round(3. * height / 4.);
} else if (wc == L'╯') {
start_x = 0;
start_y = hh;
end_x = hw;
end_y = 0;
c1_x = hw + 2;
c1_y = hh + 1;
c2_x = hw + 1;
c2_y = round(height / 4.);
} else {
assert(wc == L'╰');
start_x = hw;
start_y = 0;
end_x = width - 1;
end_y = hh;
c1_x = hw;
c1_y = round(height / 4.);
c2_x = hw;
c2_y = hh + 1;
}
LOG_INFO("%f, %f", round(3. * height / 4.), round(height / 4.));
int num_samples = height * 4;
for (size_t i = 0; i < num_samples + 1; i++) {
double t = (double)i / num_samples;
int p_x = cubic_bezier_x(t);
int p_y = cubic_bezier_y(t);
for (int y = max(p_y - delta, 0); y < min(p_y + delta + extra, height); y++) {
for (int x = max(p_x - delta, 0); x < min(p_x + delta + extra, width); x++) {
size_t ofs = x / 8;
size_t bit_no = x % 8;
buf[y * stride + ofs] |= 1 << bit_no;
}
}
}
}
static void
draw_box_drawings_light_left(uint8_t *buf, int width, int height, int stride, int dpi)
{
@ -1586,11 +1680,7 @@ draw_glyph(wchar_t wc, uint8_t *buf, int width, int height, int stride, int dpi)
case 0x256a: draw_box_drawings_vertical_single_and_horizontal_double(buf, width, height, stride, dpi); break;
case 0x256b: draw_box_drawings_vertical_double_and_horizontal_single(buf, width, height, stride, dpi); break;
case 0x256c: draw_box_drawings_double_vertical_and_horizontal(buf, width, height, stride, dpi); break;
case 0x256d:
case 0x256e:
case 0x256f:
LOG_WARN("unimplemented: box drawing: wc=%04lx", (long)wc);
break;
case 0x256d ... 0x2570: draw_box_drawings_light_arc(wc, buf, width, height, stride, dpi); break;
case 0x2574: draw_box_drawings_light_left(buf, width, height, stride, dpi); break;
case 0x2575: draw_box_drawings_light_up(buf, width, height, stride, dpi); break;
@ -1605,7 +1695,6 @@ draw_glyph(wchar_t wc, uint8_t *buf, int width, int height, int stride, int dpi)
case 0x257e: draw_box_drawings_heavy_left_and_light_right(buf, width, height, stride, dpi); break;
case 0x257f: draw_box_drawings_heavy_up_and_light_down(buf, width, height, stride, dpi); break;
case 0x2570:
case 0x2571:
case 0x2572:
case 0x2573: