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box-drawing: LIGHT DIAGONALs

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* U+2571
* U+2572
* U+2573
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Daniel Eklöf 2021-01-01 21:01:02 +01:00
parent ca423bcb01
commit 81ac95995a
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GPG key ID: 5BBD4992C116573F
1 changed files with 50 additions and 6 deletions
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56
box-drawing.c
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@ -1349,6 +1349,53 @@ draw_box_drawings_light_arc(wchar_t wc, uint8_t *buf, int width, int height, int
}
}
static void
draw_box_drawings_light_diagonal(uint8_t *buf, int width, int height, int stride, int dpi, double k, double c)
{
#define linear_equation(x) (k * (x) + c)
int num_samples = width * 16;
for (int i = 0; i < num_samples; i++) {
double x = i / 16.;
int col = round(x);
int row = round(linear_equation(x));
if (row >= 0 && row < height) {
size_t ofs = col / 8;
size_t bit_no = col % 8;
buf[row * stride + ofs] |= 1 << bit_no;
}
}
#undef linear_equation
}
static void
draw_box_drawings_light_diagonal_upper_right_to_lower_left(uint8_t *buf, int width, int height, int stride, int dpi)
{
/* y = k * x + c */
double c = height - 1;
double k = (0 - (height - 1)) / (double)(width - 1 - 0);
draw_box_drawings_light_diagonal(buf, width, height, stride, dpi, k, c);
}
static void
draw_box_drawings_light_diagonal_upper_left_to_lower_right(uint8_t *buf, int width, int height, int stride, int dpi)
{
/* y = k * x + c */
double c = 0;
double k = (height - 1 - 0) / (double)(width - 1 - 0);
draw_box_drawings_light_diagonal(buf, width, height, stride, dpi, k, c);
}
static void
draw_box_drawings_light_diagonal_cross(uint8_t *buf, int width, int height, int stride, int dpi)
{
draw_box_drawings_light_diagonal_upper_right_to_lower_left(buf, width, height, stride, dpi);
draw_box_drawings_light_diagonal_upper_left_to_lower_right(buf, width, height, stride, dpi);
}
static void
draw_box_drawings_light_left(uint8_t *buf, int width, int height, int stride, int dpi)
{
@ -1894,6 +1941,9 @@ draw_glyph(wchar_t wc, uint8_t *buf, int width, int height, int stride, int dpi)
case 0x256c: draw_box_drawings_double_vertical_and_horizontal(buf, width, height, stride, dpi); break;
case 0x256d ... 0x2570: draw_box_drawings_light_arc(wc, buf, width, height, stride, dpi); break;
case 0x2571: draw_box_drawings_light_diagonal_upper_right_to_lower_left(buf, width, height, stride, dpi); break;
case 0x2572: draw_box_drawings_light_diagonal_upper_left_to_lower_right(buf, width, height, stride, dpi); break;
case 0x2573: draw_box_drawings_light_diagonal_cross(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;
case 0x2576: draw_box_drawings_light_right(buf, width, height, stride, dpi); break;
@ -1907,12 +1957,6 @@ 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 0x2571:
case 0x2572:
case 0x2573:
LOG_WARN("unimplemented: box drawing: wc=%04lx", (long)wc);
break;
case 0x2580: draw_upper_half_block(buf, width, height, stride, dpi); break;
case 0x2581: draw_lower_one_eighth_block(buf, width, height, stride, dpi); break;
case 0x2582: draw_lower_one_quarter_block(buf, width, height, stride, dpi); break;