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osc: xparsecolor: parse 'legacy' colors

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Daniel Eklöf 2019-08-28 17:29:03 +02:00
parent 2d7ca416f0
commit f1e94aef2c
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GPG key ID: 5BBD4992C116573F
1 changed files with 46 additions and 2 deletions
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48
osc.c
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@ -180,6 +180,50 @@ osc_flash(struct terminal *term)
term_flash(term, 50);
}
static bool
parse_legacy_color(const char *string, uint32_t *color)
{
if (string[0] != '#')
return false;
string++;
const size_t len = strlen(string);
if (len % 3 != 0)
return false;
const int digits = len / 3;
int rgb[3];
for (size_t i = 0; i < 3; i++) {
rgb[i] = 0;
for (size_t j = 0; j < digits; j++) {
size_t idx = i * digits + j;
char c = string[idx];
rgb[i] <<= 4;
if (!isxdigit(c))
rgb[i] |= 0;
else
rgb[i] |= c >= '0' && c <= '9' ? c - '0' :
c >= 'a' && c <= 'f' ? c - 'a' + 10 : c - 'A' + 10;
}
/* Values with less than 16 bits represent the *most
* significant bits*. I.e. the values are *not* scaled */
rgb[i] <<= 16 - (4 * digits);
}
/* Re-scale to 8-bit */
uint8_t r = 255 * (rgb[0] / 65535.);
uint8_t g = 255 * (rgb[1] / 65535.);
uint8_t b = 255 * (rgb[2] / 65535.);
LOG_DBG("legacy: %02x%02x%02x", r, g, b);
*color = r << 16 | g << 8 | b;
return true;
}
static bool
parse_rgb(const char *string, uint32_t *color)
{
@ -304,7 +348,7 @@ osc_dispatch(struct terminal *term)
}
uint32_t color;
if (!parse_rgb(string, &color))
if (string[0] == '#' ? !parse_legacy_color(string, &color) : !parse_rgb(string, &color))
break;
LOG_DBG("change color definition for #%u to %06x", idx, color);
@ -338,7 +382,7 @@ osc_dispatch(struct terminal *term)
}
uint32_t color;
if (!parse_rgb(string, &color))
if (string[0] == '#' ? !parse_legacy_color(string, &color) : !parse_rgb(string, &color))
break;
LOG_DBG("change color definition for %s to %06x",