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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
View File

@ -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_,

89
test/functional/terminal/tui_spec.lua
View File

@ -871,9 +871,9 @@ describe('TUI background color', function()
screen:expect{any='did OptionSet, yay!'}
end)
local function assert_bg(color, bg)
local function assert_bg(colorspace, color, bg)
it('handles '..color..' as '..bg, function()
feed_data('\027]11;rgb:'..color..'\007')
feed_data('\027]11;'..colorspace..':'..color..'\007')
-- Retry until the terminal response is handled.
retry(100, nil, function()
feed_data(':echo &background\n')
@ -893,42 +893,59 @@ describe('TUI background color', function()
end)
end
assert_bg('0000/0000/0000', 'dark')
assert_bg('ffff/ffff/ffff', 'light')
assert_bg('000/000/000', 'dark')
assert_bg('fff/fff/fff', 'light')
assert_bg('00/00/00', 'dark')
assert_bg('ff/ff/ff', 'light')
assert_bg('0/0/0', 'dark')
assert_bg('f/f/f', 'light')
assert_bg('rgb', '0000/0000/0000', 'dark')
assert_bg('rgb', 'ffff/ffff/ffff', 'light')
assert_bg('rgb', '000/000/000', 'dark')
assert_bg('rgb', 'fff/fff/fff', 'light')
assert_bg('rgb', '00/00/00', 'dark')
assert_bg('rgb', 'ff/ff/ff', 'light')
assert_bg('rgb', '0/0/0', 'dark')
assert_bg('rgb', 'f/f/f', 'light')
assert_bg('f/0/0', 'dark')
assert_bg('0/f/0', 'light')
assert_bg('0/0/f', 'dark')
assert_bg('rgb', 'f/0/0', 'dark')
assert_bg('rgb', '0/f/0', 'light')
assert_bg('rgb', '0/0/f', 'dark')
assert_bg('1/1/1', 'dark')
assert_bg('2/2/2', 'dark')
assert_bg('3/3/3', 'dark')
assert_bg('4/4/4', 'dark')
assert_bg('5/5/5', 'dark')
assert_bg('6/6/6', 'dark')
assert_bg('7/7/7', 'dark')
assert_bg('8/8/8', 'light')
assert_bg('9/9/9', 'light')
assert_bg('a/a/a', 'light')
assert_bg('b/b/b', 'light')
assert_bg('c/c/c', 'light')
assert_bg('d/d/d', 'light')
assert_bg('e/e/e', 'light')
assert_bg('rgb', '1/1/1', 'dark')
assert_bg('rgb', '2/2/2', 'dark')
assert_bg('rgb', '3/3/3', 'dark')
assert_bg('rgb', '4/4/4', 'dark')
assert_bg('rgb', '5/5/5', 'dark')
assert_bg('rgb', '6/6/6', 'dark')
assert_bg('rgb', '7/7/7', 'dark')
assert_bg('rgb', '8/8/8', 'light')
assert_bg('rgb', '9/9/9', 'light')
assert_bg('rgb', 'a/a/a', 'light')
assert_bg('rgb', 'b/b/b', 'light')
assert_bg('rgb', 'c/c/c', 'light')
assert_bg('rgb', 'd/d/d', 'light')
assert_bg('rgb', 'e/e/e', 'light')
assert_bg('0/e/0', 'light')
assert_bg('0/d/0', 'light')
assert_bg('0/c/0', 'dark')
assert_bg('0/b/0', 'dark')
assert_bg('rgb', '0/e/0', 'light')
assert_bg('rgb', '0/d/0', 'light')
assert_bg('rgb', '0/c/0', 'dark')
assert_bg('rgb', '0/b/0', 'dark')
assert_bg('f/0/f', 'dark')
assert_bg('f/1/f', 'dark')
assert_bg('f/2/f', 'dark')
assert_bg('f/3/f', 'light')
assert_bg('f/4/f', 'light')
assert_bg('rgb', 'f/0/f', 'dark')
assert_bg('rgb', 'f/1/f', 'dark')
assert_bg('rgb', 'f/2/f', 'dark')
assert_bg('rgb', 'f/3/f', 'light')
assert_bg('rgb', 'f/4/f', 'light')
assert_bg('rgba', '0000/0000/0000/0000', 'dark')
assert_bg('rgba', '0000/0000/0000/ffff', 'dark')
assert_bg('rgba', 'ffff/ffff/ffff/0000', 'light')
assert_bg('rgba', 'ffff/ffff/ffff/ffff', 'light')
assert_bg('rgba', '000/000/000/000', 'dark')
assert_bg('rgba', '000/000/000/fff', 'dark')
assert_bg('rgba', 'fff/fff/fff/000', 'light')
assert_bg('rgba', 'fff/fff/fff/fff', 'light')
assert_bg('rgba', '00/00/00/00', 'dark')
assert_bg('rgba', '00/00/00/ff', 'dark')
assert_bg('rgba', 'ff/ff/ff/00', 'light')
assert_bg('rgba', 'ff/ff/ff/ff', 'light')
assert_bg('rgba', '0/0/0/0', 'dark')
assert_bg('rgba', '0/0/0/f', 'dark')
assert_bg('rgba', 'f/f/f/0', 'light')
assert_bg('rgba', 'f/f/f/f', 'light')
end)