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/* Translate a group of 8 pixels (2x8 vertical rectangle) to the corresponding
* braille character. The byte should correspond to the pixels arranged as
* follows, where 0 is the least significant bit, and 7 the most significant
* bit:
*
* 0 3
* 1 4
* 2 5
* 6 7
*
* The corresponding utf8 encoded character is set into the three bytes
* pointed by 'output'.
*/
#include <stdio.h>
void lwEmitPixelsGroup(int byte, char *output) {
int code = 0x2800 + byte;
/* Convert to unicode. This is in the U0800-UFFFF range, so we need to
* emit it like this in three bytes:
* 1110xxxx 10xxxxxx 10xxxxxx. */
output[1] = 0xE0 | (code >> 12); /* 1110-xxxx */
output[2] = 0x80 | ((code >> 6) & 0x3F); /* 10-xxxxxx */
output[3] = 0x80 | (code & 0x3F); /* 10-xxxxxx */
}
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