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font info

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This commit is contained in:
Maxim Devaev 2024-03-07 04:58:00 +02:00
parent 897ad4951b
commit a75d6487e3
2 changed files with 30 additions and 0 deletions
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28
src/libs/frametext.c
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@ -52,6 +52,34 @@ void us_frametext_destroy(us_frametext_s *ft) {
free(ft);
}
/*
Every character in the font is encoded row-wise in 8 bytes.
The least significant bit of each byte corresponds to the first pixel in a row.
The character 'A' (0x41 / 65) is encoded as { 0x0C, 0x1E, 0x33, 0x33, 0x3F, 0x33, 0x33, 0x00}
0x0C => 0000 1100 => ..XX....
0X1E => 0001 1110 => .XXXX...
0x33 => 0011 0011 => XX..XX..
0x33 => 0011 0011 => XX..XX..
0x3F => 0011 1111 => xxxxxx..
0x33 => 0011 0011 => XX..XX..
0x33 => 0011 0011 => XX..XX..
0x00 => 0000 0000 => ........
To access the nth pixel in a row, right-shift by n.
. . X X . . . .
| | | | | | | |
(0x0C >> 0) & 1 == 0-+ | | | | | | |
(0x0C >> 1) & 1 == 0---+ | | | | | |
(0x0C >> 2) & 1 == 1-----+ | | | | |
(0x0C >> 3) & 1 == 1-------+ | | | |
(0x0C >> 4) & 1 == 0---------+ | | |
(0x0C >> 5) & 1 == 0-----------+ | |
(0x0C >> 6) & 1 == 0-------------+ |
(0x0C >> 7) & 1 == 0---------------+
*/
void us_frametext_draw(us_frametext_s *ft, const char *text, uint width, uint height) {
assert(width > 0);
assert(height > 0);

2
src/libs/frametext_font.c
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@ -27,6 +27,8 @@
const u8 US_FRAMETEXT_FONT[128][8] = {
// https://github.com/dhepper/font8x8/blob/master/font8x8_basic.h
// Author: Daniel Hepper <daniel@hepper.net>
// License: Public Domain
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0000 (nul)
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0001
{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}, // U+0002