51 lines
1.6 KiB
C++
51 lines
1.6 KiB
C++
#pragma once
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#include <stddef.h>
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#include <stdint.h>
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namespace palette {
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constexpr uint16_t rgb565(uint8_t red, uint8_t green, uint8_t blue) {
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return (static_cast<uint16_t>(red & 0xF8) << 8) |
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(static_cast<uint16_t>(green & 0xFC) << 3) | (blue >> 3);
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}
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constexpr uint16_t kOtherGrey = rgb565(176, 176, 176);
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constexpr uint16_t kWhite = rgb565(255, 255, 255);
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constexpr uint16_t kHues[] = {0, 30, 60, 120, 180, 225, 270, 300, 330};
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constexpr uint16_t kColors[] = {
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rgb565(255, 128, 128), rgb565(255, 191, 128), rgb565(255, 255, 128),
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rgb565(128, 255, 128), rgb565(128, 255, 255), rgb565(128, 159, 255),
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rgb565(191, 128, 255), rgb565(255, 128, 255), rgb565(255, 128, 191),
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};
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constexpr const char* kHueNames[] = {
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"Red", "Orange", "Yellow", "Green", "Cyan", "Blue",
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"Violet", "Magenta", "Pink",
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};
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// The color picker includes the two existing neutral choices before the hue
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// palette documented in docs/history/PLAN.md.
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constexpr uint8_t kChoiceCount = 11;
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inline uint16_t colorForChoice(uint8_t choice) {
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if (choice == 0) return kWhite;
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if (choice == 1) return kOtherGrey;
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return choice < kChoiceCount ? kColors[choice - 2] : kWhite;
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}
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inline const char* nameForChoice(uint8_t choice) {
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if (choice == 0) return "White";
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if (choice == 1) return "Gray";
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return choice < kChoiceCount ? kHueNames[choice - 2] : "White";
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}
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inline int indexForHue(uint16_t hue) {
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for (size_t index = 0; index < sizeof(kHues) / sizeof(kHues[0]); ++index) {
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if (kHues[index] == hue) return static_cast<int>(index);
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}
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return -1;
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}
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} // namespace palette
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