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Support for color fallback. (#66)

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On terminal not supporting some color palette, fallback toward the
closest one.
This commit is contained in:
Arthur Sonzogni
2020-12-23 14:45:57 +01:00
committed by GitHub
parent 305346542a
commit 92ec5ab4ca
1 changed files with 35 additions and 3 deletions
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38
src/ftxui/screen/color.cpp
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@@ -2,7 +2,9 @@
#include <algorithm>
#include "ftxui/screen/color_info.hpp"
#include "ftxui/screen/string.hpp"
#include "ftxui/screen/terminal.hpp"
namespace ftxui {
@@ -36,7 +38,7 @@ std::wstring Color::Print(bool is_background_color) const {
return palette16code[index_][is_background_color];
case ColorType::Palette256:
return (is_background_color ? L"48;5;" : L"38;5") + to_wstring(index_);
return (is_background_color ? L"48;5;" : L"38;5;") + to_wstring(index_);
case ColorType::TrueColor:
return (is_background_color ? L"48;2;" : L"38;2;") //
@@ -61,7 +63,12 @@ Color::Color(Palette16 index) : type_(ColorType::Palette16), index_(index) {}
/// @brief Build a transparent using Palette256 colors.
/// @ingroup screen
Color::Color(Palette256 index) : type_(ColorType::Palette256), index_(index) {}
Color::Color(Palette256 index) : type_(ColorType::Palette256), index_(index) {
if (Terminal::ColorSupport() >= Terminal::Color::Palette256)
return;
type_ = ColorType::Palette16;
index_ = GetColorInfo(Color::Palette256(index_)).index_16;
}
/// @brief Build a Color from its RGB representation.
/// https://en.wikipedia.org/wiki/RGB_color_model
@@ -71,7 +78,32 @@ Color::Color(Palette256 index) : type_(ColorType::Palette256), index_(index) {}
/// @param blue The quantity of blue [0,255]
/// @ingroup screen
Color::Color(uint8_t red, uint8_t green, uint8_t blue)
: type_(ColorType::TrueColor), red_(red), green_(green), blue_(blue) {}
: type_(ColorType::TrueColor), red_(red), green_(green), blue_(blue) {
if (Terminal::ColorSupport() == Terminal::Color::TrueColor)
return;
int closest = 256 * 256 * 3;
int best = 0;
for (int i = 16; i < 256; ++i) {
ColorInfo color_info = GetColorInfo(Color::Palette256(i));
int dr = color_info.red - red;
int dg = color_info.green - green;
int db = color_info.blue - blue;
int dist = dr * dr + dg * dg + db * db;
if (closest > dist) {
closest = dist;
best = i;
}
}
if (Terminal::ColorSupport() == Terminal::Color::Palette256) {
type_ = ColorType::Palette256;
index_ = best;
} else {
type_ = ColorType::Palette16;
index_ = GetColorInfo(Color::Palette256(best)).index_16;
}
}
/// @brief Build a Color from its RGB representation.
/// https://en.wikipedia.org/wiki/RGB_color_model