a54985b27
Denys Vlasenko
2010-06-24
Subject
conspy: document attribute byte format
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miscutils/conspy.c+34 -8
| @@ -62,7 +62,7 @@ struct globals { | |
| int kbd_fd; | |
| unsigned width; | |
| unsigned height; | |
| - | char last_attr; |
| + | uint8_t last_attr; |
| int ioerror_count; | |
| int key_count; | |
| int escape_count; | |
| @@ -112,17 +112,43 @@ static void screen_read_close(void) | |
| static void screen_char(char *data) | |
| { | |
| - | if (!BW && G.last_attr != ATTR(data)) { |
| - | // BLGCRMOW |
| + | uint8_t attr = ATTR(data); |
| + | |
| + | if (!BW && G.last_attr != attr) { |
| + | // Attribute layout for VGA compatible text videobuffer: |
| + | // blinking text |
| + | // |red bkgd |
| + | // ||green bkgd |
| + | // |||blue bkgd |
| + | // vvvv |
| + | // 00000000 <- lsb bit on the right |
| + | // bold text / text 8th bit |
| + | // red text |
| + | // green text |
| + | // blue text |
| + | // TODO: apparently framebuffer-based console uses different layout |
| + | // (bug? attempt to get 8th text bit in better position?) |
| + | // red bkgd |
| + | // |green bkgd |
| + | // ||blue bkgd |
| + | // vvv |
| + | // 00000000 <- lsb bit on the right |
| + | // bold text |
| + | // red text |
| + | // green text |
| + | // blue text |
| + | // text 8th bit |
| + | // converting RGB color bit triad to BGR: |
| static const char color[8] = "04261537"; | |
| + | G.last_attr = attr; |
| printf("\033[%c;4%c;3%cm", | |
| - | (ATTR(data) & 8) ? '1' // bold |
| - | : '0', // defaults |
| - | color[(ATTR(data) >> 4) & 7], color[ATTR(data) & 7]); |
| - | G.last_attr = ATTR(data); |
| + | (attr & 8) ? '1' : '0', // bold text / reset all |
| + | color[(attr >> 4) & 7], // bkgd color |
| + | color[attr & 7] // text color |
| + | ); |
| } | |
| - | bb_putchar(CHAR(data)); |
| + | putchar(CHAR(data)); |
| } | |
| #define clrscr() printf("\033[1;1H" "\033[0J") | |