| 8 | } |
| 9 | |
| 10 | public static void drawLine(byte[] screen, int width, int x1, int x2, int y) { |
| 11 | int start_offset = x1 % 8; |
| 12 | int first_full_byte = x1 / 8; |
| 13 | if (start_offset != 0) { |
| 14 | first_full_byte++; |
| 15 | } |
| 16 | |
| 17 | int end_offset = x2 % 8; |
| 18 | int last_full_byte = x2 / 8; |
| 19 | if (end_offset != 7) { |
| 20 | last_full_byte--; |
| 21 | } |
| 22 | |
| 23 | // Set full bytes |
| 24 | for (int b = first_full_byte; b <= last_full_byte; b++) { |
| 25 | screen[(width / 8) * y + b] = (byte) 0xFF; |
| 26 | } |
| 27 | |
| 28 | byte start_mask = (byte) (0xFF >> start_offset); |
| 29 | byte end_mask = (byte) ~(0xFF >> (end_offset + 1)); |
| 30 | |
| 31 | // Set start and end of line |
| 32 | if ((x1 / 8) == (x2 / 8)) { // If x1 and x2 are in the same byte |
| 33 | byte mask = (byte) (start_mask & end_mask); |
| 34 | screen[(width / 8) * y + (x1 / 8)] |= mask; |
| 35 | } else { |
| 36 | if (start_offset != 0) { |
| 37 | int byte_number = (width / 8) * y + first_full_byte - 1; |
| 38 | screen[byte_number] |= start_mask; |
| 39 | } |
| 40 | if (end_offset != 7) { |
| 41 | int byte_number = (width / 8) * y + last_full_byte + 1; |
| 42 | screen[byte_number] |= end_mask; |
| 43 | } |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | public static void printByte(byte b) { |
| 48 | for (int i = 7; i >= 0; i--) { |