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box-drawing: LIGHT/MEDIUM/DARK SHADE

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* U+2591
* U+2592
* U+2593
This commit is contained in:
Daniel Eklöf 2020-12-28 12:50:28 +01:00
parent 17a46378bf
commit 2d4185567c
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GPG key ID: 5BBD4992C116573F
1 changed files with 39 additions and 3 deletions
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42
box-drawing.c
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@ -814,6 +814,42 @@ draw_right_half_block(uint8_t *buf, int width, int height, int stride, int dpi)
rect(round(width / 2.), 0, width, height);
}
static void
draw_light_shade(uint8_t *buf, int width, int height, int stride, int dpi)
{
for (size_t row = 0; row < height; row += 2) {
for (size_t col = 0; col < width; col += 2) {
size_t idx = col / 8;
size_t bit_no = col % 8;
buf[row * stride + idx] |= 1 << bit_no;
}
}
}
static void
draw_medium_shade(uint8_t *buf, int width, int height, int stride, int dpi)
{
for (size_t row = 0; row < height; row++) {
for (size_t col = row % 2; col < width; col += 2) {
size_t idx = col / 8;
size_t bit_no = col % 8;
buf[row * stride + idx] |= 1 << bit_no;
}
}
}
static void
draw_dark_shade(uint8_t *buf, int width, int height, int stride, int dpi)
{
for (size_t row = 0; row < height; row++) {
for (size_t col = 0; col < width; col += 1 + row % 2) {
size_t idx = col / 8;
size_t bit_no = col % 8;
buf[row * stride + idx] |= 1 << bit_no;
}
}
}
static void
draw_upper_one_eighth_block(uint8_t *buf, int width, int height, int stride, int dpi)
{
@ -1067,6 +1103,9 @@ draw_glyph(wchar_t wc, uint8_t *buf, int width, int height, int stride, int dpi)
case 0x258f: draw_left_one_eighth_block(buf, width, height, stride, dpi); break;
case 0x2590: draw_right_half_block(buf, width, height, stride, dpi); break;
case 0x2591: draw_light_shade(buf, width, height, stride, dpi); break;
case 0x2592: draw_medium_shade(buf, width, height, stride, dpi); break;
case 0x2593: draw_dark_shade(buf, width, height, stride, dpi); break;
case 0x2594: draw_upper_one_eighth_block(buf, width, height, stride, dpi); break;
case 0x2595: draw_right_one_eighth_block(buf, width, height, stride, dpi); break;
case 0x2596: draw_quadrant_lower_left(buf, width, height, stride, dpi); break;
@ -1080,9 +1119,6 @@ draw_glyph(wchar_t wc, uint8_t *buf, int width, int height, int stride, int dpi)
case 0x259e: draw_quadrant_upper_right_and_lower_left(buf, width, height, stride, dpi); break;
case 0x259f: draw_quadrant_upper_right_and_lower_left_and_lower_right(buf, width, height, stride, dpi); break;
case 0x2591:
case 0x2592:
case 0x2593:
LOG_WARN("unimplemented: box drawing: wc=%04lx", (long)wc);
break;
}