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Use union instead of rgb for storing terminal color.

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This commit is contained in:
Nicolas Lesser 2018-12-12 16:57:04 +01:00
parent d87404b23b
commit 8f980b0ac7
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GPG Key ID: 55F9BC675F85A2DF
1 changed files with 71 additions and 55 deletions
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126
include/fmt/color.h
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@ -217,28 +217,45 @@ enum class emphasis : uint8_t {
strikethrough = 1 << 3
}; // enum class emphasis
// rgb is a struct for red, green and blue colors plus an extra byte to store
// a terminal color.
// rgb is a struct for red, green and blue colors.
// We use rgb as name because some editors will show it as color direct in the
// editor.
struct rgb {
FMT_CONSTEXPR_DECL rgb() : t(0), r(0), g(0), b(0) {}
FMT_CONSTEXPR_DECL rgb() : r(0), g(0), b(0) {}
FMT_CONSTEXPR_DECL rgb(uint8_t r_, uint8_t g_, uint8_t b_)
: t(0), r(r_), g(g_), b(b_) {}
: r(r_), g(g_), b(b_) {}
FMT_CONSTEXPR_DECL rgb(uint32_t hex)
: t((hex >> 24) & 0xFF), r((hex >> 16) & 0xFF), g((hex >> 8) & 0xFF),
b((hex)&0xFF) {}
: r((hex >> 16) & 0xFF), g((hex >> 8) & 0xFF), b((hex)&0xFF) {}
FMT_CONSTEXPR_DECL rgb(color hex)
: t(0), r((uint32_t(hex) >> 16) & 0xFF), g((uint32_t(hex) >> 8) & 0xFF),
: r((uint32_t(hex) >> 16) & 0xFF), g((uint32_t(hex) >> 8) & 0xFF),
b(uint32_t(hex) & 0xFF) {}
FMT_CONSTEXPR_DECL rgb(terminal_color hex) FMT_NOEXCEPT
: t(uint8_t(hex)), r(0), g(0), b(0) {}
uint8_t t; // terminal color
uint8_t r;
uint8_t g;
uint8_t b;
};
// color is a struct of either a rgb color or a terminal color.
struct color_type {
FMT_CONSTEXPR_DECL color_type() FMT_NOEXCEPT {}
FMT_CONSTEXPR_DECL color_type(color rgb_color) FMT_NOEXCEPT
:is_rgb(true) {
value.rgb_color = rgb_color;
}
FMT_CONSTEXPR_DECL color_type(rgb rgb_color) FMT_NOEXCEPT
: is_rgb(true) {
value.rgb_color = rgb_color;
}
FMT_CONSTEXPR_DECL color_type(terminal_color term_color) FMT_NOEXCEPT
: is_rgb() {
value.term_color = term_color;
}
union {
rgb rgb_color = color::black;
terminal_color term_color;
} value;
bool is_rgb = false;
};
// Experimental text formatting support.
class text_style {
public:
@ -251,18 +268,22 @@ class text_style {
set_foreground_color = rhs.set_foreground_color;
foreground_color = rhs.foreground_color;
} else if (rhs.set_foreground_color) {
foreground_color.r |= rhs.foreground_color.r;
foreground_color.g |= rhs.foreground_color.g;
foreground_color.b |= rhs.foreground_color.b;
assert(foreground_color.is_rgb && rhs.foreground_color.is_rgb &&
"can't OR a terminal color");
foreground_color.value.rgb_color.r |= rhs.foreground_color.value.rgb_color.r;
foreground_color.value.rgb_color.g |= rhs.foreground_color.value.rgb_color.g;
foreground_color.value.rgb_color.b |= rhs.foreground_color.value.rgb_color.b;
}
if (!set_background_color) {
set_background_color = rhs.set_background_color;
background_color = rhs.background_color;
} else if (rhs.set_background_color) {
background_color.r |= rhs.background_color.r;
background_color.g |= rhs.background_color.g;
background_color.b |= rhs.background_color.b;
assert(background_color.is_rgb && rhs.background_color.is_rgb &&
"can't OR a terminal color");
background_color.value.rgb_color.r |= rhs.background_color.value.rgb_color.r;
background_color.value.rgb_color.g |= rhs.background_color.value.rgb_color.g;
background_color.value.rgb_color.b |= rhs.background_color.value.rgb_color.b;
}
ems = static_cast<emphasis>(static_cast<uint8_t>(ems) |
@ -280,18 +301,22 @@ class text_style {
set_foreground_color = rhs.set_foreground_color;
foreground_color = rhs.foreground_color;
} else if (rhs.set_foreground_color) {
foreground_color.r &= rhs.foreground_color.r;
foreground_color.g &= rhs.foreground_color.g;
foreground_color.b &= rhs.foreground_color.b;
assert(foreground_color.is_rgb && rhs.foreground_color.is_rgb &&
"can't AND a terminal color");
foreground_color.value.rgb_color.r &= rhs.foreground_color.value.rgb_color.r;
foreground_color.value.rgb_color.g &= rhs.foreground_color.value.rgb_color.g;
foreground_color.value.rgb_color.b &= rhs.foreground_color.value.rgb_color.b;
}
if (!set_background_color) {
set_background_color = rhs.set_background_color;
background_color = rhs.background_color;
} else if (rhs.set_background_color) {
background_color.r &= rhs.background_color.r;
background_color.g &= rhs.background_color.g;
background_color.b &= rhs.background_color.b;
assert(background_color.is_rgb && rhs.background_color.is_rgb &&
"can't AND a terminal color");
background_color.value.rgb_color.r &= rhs.background_color.value.rgb_color.r;
background_color.value.rgb_color.g &= rhs.background_color.value.rgb_color.g;
background_color.value.rgb_color.b &= rhs.background_color.value.rgb_color.b;
}
ems = static_cast<emphasis>(static_cast<uint8_t>(ems) &
@ -313,11 +338,11 @@ class text_style {
FMT_CONSTEXPR bool has_emphasis() const FMT_NOEXCEPT {
return static_cast<uint8_t>(ems) != 0;
}
FMT_CONSTEXPR rgb get_foreground() const FMT_NOEXCEPT {
FMT_CONSTEXPR color_type get_foreground() const FMT_NOEXCEPT {
assert(has_foreground() && "no foreground specified for this style");
return foreground_color;
}
FMT_CONSTEXPR rgb get_background() const FMT_NOEXCEPT {
FMT_CONSTEXPR color_type get_background() const FMT_NOEXCEPT {
assert(has_background() && "no background specified for this style");
return background_color;
}
@ -327,7 +352,7 @@ class text_style {
}
private:
FMT_CONSTEXPR text_style(bool is_foreground, rgb text_color) FMT_NOEXCEPT
FMT_CONSTEXPR text_style(bool is_foreground, color_type text_color) FMT_NOEXCEPT
: set_foreground_color(), set_background_color(), ems() {
if (is_foreground) {
foreground_color = text_color;
@ -338,33 +363,23 @@ private:
}
}
friend FMT_CONSTEXPR_DECL text_style fg(rgb foreground) FMT_NOEXCEPT;
friend FMT_CONSTEXPR_DECL text_style fg(terminal_color foreground)
friend FMT_CONSTEXPR_DECL text_style fg(color_type foreground) FMT_NOEXCEPT;
FMT_NOEXCEPT;
friend FMT_CONSTEXPR_DECL text_style bg(rgb background) FMT_NOEXCEPT;
friend FMT_CONSTEXPR_DECL text_style bg(terminal_color background)
friend FMT_CONSTEXPR_DECL text_style bg(color_type background) FMT_NOEXCEPT;
FMT_NOEXCEPT;
rgb foreground_color;
rgb background_color;
color_type foreground_color;
color_type background_color;
bool set_foreground_color;
bool set_background_color;
emphasis ems;
};
FMT_CONSTEXPR text_style fg(rgb foreground) FMT_NOEXCEPT {
FMT_CONSTEXPR text_style fg(color_type foreground) FMT_NOEXCEPT {
return text_style(/*is_foreground=*/true, foreground);
}
FMT_CONSTEXPR_DECL text_style fg(terminal_color foreground) FMT_NOEXCEPT {
return text_style(/*is_foreground=*/true, foreground);
}
FMT_CONSTEXPR text_style bg(rgb background) FMT_NOEXCEPT {
return text_style(/*is_foreground=*/false, background);
}
FMT_CONSTEXPR_DECL text_style bg(terminal_color background) FMT_NOEXCEPT {
FMT_CONSTEXPR text_style bg(color_type background) FMT_NOEXCEPT {
return text_style(/*is_foreground=*/false, background);
}
@ -376,26 +391,27 @@ namespace internal {
template <typename Char>
struct ansi_color_escape {
FMT_CONSTEXPR ansi_color_escape(rgb color, const char * esc) FMT_NOEXCEPT {
FMT_CONSTEXPR ansi_color_escape(color_type text_color, const char * esc) FMT_NOEXCEPT {
// If we have a terminal color, we need to output another escape code
// sequence.
if (color.t) {
if (!text_color.is_rgb) {
bool is_background = esc == internal::data::BACKGROUND_COLOR;
uint8_t value = (uint8_t)text_color.value.term_color;
// Background ASCII codes are the same as the foreground ones but with
// 10 more.
if (is_background)
color.t += 10;
value += 10;
std::size_t index = 0;
buffer[index++] = static_cast<Char>('\x1b');
buffer[index++] = static_cast<Char>('[');
if (color.t >= 100) {
if (value >= 100) {
buffer[index++] = static_cast<Char>('1');
color.t %= 100;
value %= 100;
}
buffer[index++] = static_cast<Char>('0' + color.t / 10);
buffer[index++] = static_cast<Char>('0' + color.t % 10);
buffer[index++] = static_cast<Char>('0' + value / 10);
buffer[index++] = static_cast<Char>('0' + value % 10);
buffer[index++] = static_cast<Char>('m');
buffer[index++] = static_cast<Char>('\0');
@ -405,9 +421,9 @@ struct ansi_color_escape {
for (int i = 0; i < 7; i++) {
buffer[i] = static_cast<Char>(esc[i]);
}
to_esc(color.r, buffer + 7, ';');
to_esc(color.g, buffer + 11, ';');
to_esc(color.b, buffer + 15, 'm');
to_esc(text_color.value.rgb_color.r, buffer + 7, ';');
to_esc(text_color.value.rgb_color.g, buffer + 11, ';');
to_esc(text_color.value.rgb_color.b, buffer + 15, 'm');
buffer[19] = static_cast<Char>(0);
}
FMT_CONSTEXPR ansi_color_escape(emphasis em) FMT_NOEXCEPT {
@ -449,14 +465,14 @@ private:
template <typename Char>
FMT_CONSTEXPR ansi_color_escape<Char>
make_foreground_color(rgb color) FMT_NOEXCEPT {
return ansi_color_escape<Char>(color, internal::data::FOREGROUND_COLOR);
make_foreground_color(color_type foreground) FMT_NOEXCEPT {
return ansi_color_escape<Char>(foreground, internal::data::FOREGROUND_COLOR);
}
template <typename Char>
FMT_CONSTEXPR ansi_color_escape<Char>
make_background_color(rgb color) FMT_NOEXCEPT {
return ansi_color_escape<Char>(color, internal::data::BACKGROUND_COLOR);
make_background_color(color_type background) FMT_NOEXCEPT {
return ansi_color_escape<Char>(background, internal::data::BACKGROUND_COLOR);
}
template <typename Char>