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tui: support rgba background detection (#10205)

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Fixes https://github.com/neovim/neovim/issues/10159.
This commit is contained in:
Harm te Hennepe
2019-06-13 14:14:41 +02:00
committed by Daniel Hahler
parent 6f27f5ef91
commit 424ddd01f5
2 changed files with 106 additions and 80 deletions
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97
src/nvim/tui/input.c
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@@ -388,17 +388,20 @@ static void set_bg_deferred(void **argv)
// During startup, tui.c requests the background color (see `ext.get_bg`).
//
// Here in input.c, we watch for the terminal response `\e]11;COLOR\a`. If
// COLOR matches `rgb:RRRR/GGGG/BBBB` where R, G, and B are hex digits, then
// compute the luminance[1] of the RGB color and classify it as light/dark
// COLOR matches `rgb:RRRR/GGGG/BBBB/AAAA` where R, G, B, and A are hex digits,
// then compute the luminance[1] of the RGB color and classify it as light/dark
// accordingly. Note that the color components may have anywhere from one to
// four hex digits, and require scaling accordingly as values out of 4, 8, 12,
// or 16 bits.
// or 16 bits. Also note the A(lpha) component is optional, and is parsed but
// ignored in the calculations.
//
// [1] https://en.wikipedia.org/wiki/Luma_%28video%29
static bool handle_background_color(TermInput *input)
{
size_t count = 0;
size_t component = 0;
size_t header_size = 0;
size_t num_components = 0;
uint16_t rgb[] = { 0, 0, 0 };
uint16_t rgb_max[] = { 0, 0, 0 };
bool eat_backslash = false;
@@ -406,48 +409,54 @@ static bool handle_background_color(TermInput *input)
bool bad = false;
if (rbuffer_size(input->read_stream.buffer) >= 9
&& !rbuffer_cmp(input->read_stream.buffer, "\x1b]11;rgb:", 9)) {
rbuffer_consumed(input->read_stream.buffer, 9);
RBUFFER_EACH(input->read_stream.buffer, c, i) {
count = i + 1;
if (eat_backslash) {
done = true;
break;
} else if (c == '\x07') {
done = true;
break;
} else if (c == '\x1b') {
eat_backslash = true;
} else if (bad) {
// ignore
} else if (c == '/') {
if (component < 3) {
component++;
}
} else if (ascii_isxdigit(c)) {
if (component < 3 && rgb_max[component] != 0xffff) {
rgb_max[component] = (uint16_t)((rgb_max[component] << 4) | 0xf);
rgb[component] = (uint16_t)((rgb[component] << 4) | hex2nr(c));
}
} else {
bad = true;
}
}
rbuffer_consumed(input->read_stream.buffer, count);
if (done && !bad && rgb_max[0] && rgb_max[1] && rgb_max[2]) {
double r = (double)rgb[0] / (double)rgb_max[0];
double g = (double)rgb[1] / (double)rgb_max[1];
double b = (double)rgb[2] / (double)rgb_max[2];
double luminance = (0.299 * r) + (0.587 * g) + (0.114 * b); // CCIR 601
char *bgvalue = luminance < 0.5 ? "dark" : "light";
DLOG("bg response: %s", bgvalue);
loop_schedule_deferred(&main_loop,
event_create(set_bg_deferred, 1, bgvalue));
} else {
DLOG("failed to parse bg response");
}
return true;
header_size = 9;
num_components = 3;
} else if (rbuffer_size(input->read_stream.buffer) >= 10
&& !rbuffer_cmp(input->read_stream.buffer, "\x1b]11;rgba:", 10)) {
header_size = 10;
num_components = 4;
} else {
return false;
}
return false;
rbuffer_consumed(input->read_stream.buffer, header_size);
RBUFFER_EACH(input->read_stream.buffer, c, i) {
count = i + 1;
if (eat_backslash) {
done = true;
break;
} else if (c == '\x07') {
done = true;
break;
} else if (c == '\x1b') {
eat_backslash = true;
} else if (bad) {
// ignore
} else if ((c == '/') && (++component < num_components)) {
// work done in condition
} else if (ascii_isxdigit(c)) {
if (component < 3 && rgb_max[component] != 0xffff) {
rgb_max[component] = (uint16_t)((rgb_max[component] << 4) | 0xf);
rgb[component] = (uint16_t)((rgb[component] << 4) | hex2nr(c));
}
} else {
bad = true;
}
}
rbuffer_consumed(input->read_stream.buffer, count);
if (done && !bad && rgb_max[0] && rgb_max[1] && rgb_max[2]) {
double r = (double)rgb[0] / (double)rgb_max[0];
double g = (double)rgb[1] / (double)rgb_max[1];
double b = (double)rgb[2] / (double)rgb_max[2];
double luminance = (0.299 * r) + (0.587 * g) + (0.114 * b); // CCIR 601
char *bgvalue = luminance < 0.5 ? "dark" : "light";
DLOG("bg response: %s", bgvalue);
loop_schedule_deferred(&main_loop,
event_create(set_bg_deferred, 1, bgvalue));
} else {
DLOG("failed to parse bg response");
return false;
}
return true;
}
static void tinput_read_cb(Stream *stream, RBuffer *buf, size_t count_,