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conspy: document attribute byte format

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-06-24 17:50:00 +02:00
parent a091d45c3b
commit a54985b279
1 changed files with 34 additions and 8 deletions
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42
miscutils/conspy.c
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@ -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")