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95 lines
2.5 KiB
C++
95 lines
2.5 KiB
C++
#pragma once
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#include <iomanip>
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#include "common.hpp"
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#include "utils/string.hpp"
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#include "x11/xlib.hpp"
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LEMONBUDDY_NS
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namespace color_util {
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template <typename T = uint8_t>
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T alpha_channel(const uint32_t value) {
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uint8_t a = value >> 24;
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if (std::is_same<T, uint8_t>::value)
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return a << 8 / 0xff;
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else if (std::is_same<T, uint16_t>::value)
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return a << 8 | a << 8 / 0xff;
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}
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template <typename T = uint8_t>
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T red_channel(const uint32_t value) {
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uint8_t r = value >> 16;
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if (std::is_same<T, uint8_t>::value)
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return r << 8 / 0xff;
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else if (std::is_same<T, uint16_t>::value)
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return r << 8 | r << 8 / 0xff;
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}
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template <typename T = uint8_t>
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T green_channel(const uint32_t value) {
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uint8_t g = value >> 8;
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if (std::is_same<T, uint8_t>::value)
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return g << 8 / 0xff;
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else if (std::is_same<T, uint16_t>::value)
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return g << 8 | g << 8 / 0xff;
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}
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template <typename T = uint8_t>
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T blue_channel(const uint32_t value) {
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uint8_t b = value;
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if (std::is_same<T, uint8_t>::value)
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return b << 8 / 0xff;
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else if (std::is_same<T, uint16_t>::value)
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return b << 8 | b << 8 / 0xff;
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}
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template <typename T = uint32_t>
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uint32_t premultiply_alpha(const T value) {
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auto a = color_util::alpha_channel(value);
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auto r = color_util::red_channel(value) * a / 255;
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auto g = color_util::green_channel(value) * a / 255;
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auto b = color_util::blue_channel(value) * a / 255;
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return (a << 24) | (r << 16) | (g << 8) | b;
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}
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template <typename T = uint8_t>
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string hex(uint32_t color) {
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char s[12];
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size_t len = 0;
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uint8_t a = alpha_channel<T>(color);
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uint8_t r = red_channel<T>(color);
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uint8_t g = green_channel<T>(color);
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uint8_t b = blue_channel<T>(color);
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if (std::is_same<T, uint16_t>::value) {
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len = snprintf(s, sizeof(s), "#%02x%02x%02x%02x", a, r, g, b);
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} else if (std::is_same<T, uint8_t>::value) {
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len = snprintf(s, sizeof(s), "#%02x%02x%02x", r, g, b);
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}
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return string{s, 0, len};
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}
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inline string parse_hex(string hex) {
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if (hex.substr(0, 1) != "#")
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hex = "#" + hex;
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if (hex.length() == 4)
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hex = {'#', hex[1], hex[1], hex[2], hex[2], hex[3], hex[3]};
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if (hex.length() == 7)
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hex = "#ff" + hex.substr(1);
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if (hex.length() != 9)
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return "";
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return hex;
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}
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inline uint32_t parse(string hex) {
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if ((hex = parse_hex(hex)).empty())
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return 0U;
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return std::strtoul(&hex[1], nullptr, 16);
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}
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}
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LEMONBUDDY_NS_END
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