git.joshuawise.com / netwatch.git / blame
| Commit | Line | Data |
|---|---|---|
| cdde55f5 JW |
1 | #include <io.h> |
| 2 | #include <text.h> | |
| 3 | #include <paging.h> | |
| 4 | #include <minilib.h> | |
| 5 | #include <stdint.h> | |
| 6 | ||
| 7 | static unsigned char _font[256 * 32]; | |
| 8 | ||
| 9 | /* Must be called from a firstrun context, where we don't care about saving | |
| 10 | * 0x3CE state. */ | |
| 11 | void text_init() | |
| 12 | { | |
| 13 | unsigned char oldread; | |
| 14 | outb(0x3CE, 0x05 /* Mode register */); | |
| 15 | outb(0x3CF, inb(0x3CF) & ~(0x10 /* Odd/even */)); | |
| 16 | outb(0x3CE, 0x04 /* Read register */); | |
| 17 | oldread = inb(0x3CF); | |
| 18 | outb(0x3CF, 0x02 /* Font plane */); | |
| 19 | memcpy(_font, p2v(0xB8000), sizeof(_font)); | |
| 20 | outb(0x3CF, oldread); | |
| 21 | } | |
| 22 | ||
| 23 | void text_render(unsigned char *buf, unsigned int x, unsigned int y, unsigned int w, unsigned int h) | |
| 24 | { | |
| 25 | unsigned char *video = p2v(0xB8000); | |
| 26 | unsigned int textx = x / 9; | |
| 27 | unsigned int texty = y / 14; | |
| 28 | unsigned int cx, cy; | |
| 29 | unsigned char ch, at, font; | |
| 30 | ||
| 31 | for (cy = y; cy < (y + h); cy++) | |
| 32 | { | |
| 33 | texty = cy / 14; | |
| 34 | textx = cx / 9; | |
| 35 | ch = video[texty * 50 + textx * 2]; | |
| 36 | at = video[texty * 50 + textx * 2 + 1]; | |
| 37 | font = _font[ch * 32 + cy % 14]; | |
| 38 | for (cx = x; cx < (x + w); cx++) | |
| 39 | { | |
| 40 | unsigned int pos = cx % 9; | |
| 41 | if (pos == 0) | |
| 42 | { | |
| 43 | textx = cx / 9; | |
| 44 | ch = video[texty * 50 + textx * 2]; | |
| 45 | at = video[texty * 50 + textx * 2 + 1]; | |
| 46 | font = _font[ch * 32 + cy % 14]; | |
| 47 | } | |
| 48 | /* XXX always BGR888 */ | |
| 49 | if (pos == 8) /* 9th pixel is cloned */ | |
| 50 | pos = 7; | |
| 51 | if ((font >> (7 - pos)) & 1) | |
| 52 | { | |
| 53 | *(buf++) = (at & 0x01) ? 0xFF : 0x00; | |
| 54 | *(buf++) = (at & 0x02) ? 0xFF : 0x00; | |
| 55 | *(buf++) = (at & 0x04) ? 0xFF : 0x00; | |
| 56 | } else { | |
| 57 | *(buf++) = (at & 0x10) ? 0xFF : 0x00; | |
| 58 | *(buf++) = (at & 0x20) ? 0xFF : 0x00; | |
| 59 | *(buf++) = (at & 0x40) ? 0xFF : 0x00; | |
| 60 | } | |
| 61 | } | |
| 62 | } | |
| 63 | } | |
| 64 | ||
| 65 | uint32_t text_checksum(int x, int y, int w, int h) | |
| 66 | { | |
| 67 | unsigned char *video = p2v(0xB8000); | |
| 68 | unsigned int textx = x / 9; | |
| 69 | unsigned int texty = y / 14; | |
| 70 | int cx, cy; | |
| 71 | unsigned char ch, at; | |
| 72 | uint32_t cksm = 0; | |
| 73 | ||
| 74 | for (cy = y; cy < (y + h); cy++) | |
| 75 | { | |
| 76 | texty = cy / 14; | |
| 77 | textx = cx / 9; | |
| 78 | ch = video[texty * 50 + textx * 2]; | |
| 79 | at = video[texty * 50 + textx * 2 + 1]; | |
| 80 | for (cx = x; cx < (x + w); cx++) | |
| 81 | { | |
| 82 | unsigned int pos = cx % 9; | |
| 83 | if (pos == 0) | |
| 84 | { | |
| 85 | textx = cx / 9; | |
| 86 | ch = video[texty * 50 + textx * 2]; | |
| 87 | at = video[texty * 50 + textx * 2 + 1]; | |
| 88 | } | |
| 89 | ||
| 90 | cksm += ch + (at << 16); | |
| 91 | } | |
| 92 | } | |
| 93 | ||
| 94 | return cksm; | |
| 95 | } |