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Implement grayscale DMG palette specs (#1709)

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This commit is contained in:
Rangi
2025-06-30 14:53:05 -04:00
committed by GitHub
parent 5942117ac3
commit 7054d81650
21 changed files with 166 additions and 76 deletions
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31
include/gfx/main.hpp
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@@ -29,8 +29,10 @@ struct Options {
NO_SPEC,
EXPLICIT,
EMBEDDED,
DMG,
} palSpecType = NO_SPEC; // -c
std::vector<std::array<std::optional<Rgba>, 4>> palSpec{};
uint8_t palSpecDmg = 0;
uint8_t bitDepth = 2; // -d
std::string inputTileset{}; // -i
struct {
@@ -65,6 +67,12 @@ struct Options {
mutable bool hasTransparentPixels = false;
uint8_t maxOpaqueColors() const { return nbColorsPerPal - hasTransparentPixels; }
uint8_t dmgColors[4] = {};
uint8_t dmgValue(uint8_t i) const {
assume(i < 4);
return (palSpecDmg >> (2 * i)) & 0b11;
}
};
extern Options options;
@@ -119,27 +127,4 @@ static constexpr auto flipTable = ([]() constexpr {
return table;
})();
// Parsing helpers.
static constexpr uint8_t nibble(char c) {
if (c >= 'a') {
assume(c <= 'f');
return c - 'a' + 10;
} else if (c >= 'A') {
assume(c <= 'F');
return c - 'A' + 10;
} else {
assume(c >= '0' && c <= '9');
return c - '0';
}
}
static constexpr uint8_t toHex(char c1, char c2) {
return nibble(c1) * 16 + nibble(c2);
}
static constexpr uint8_t singleToHex(char c) {
return toHex(c, c);
}
#endif // RGBDS_GFX_MAIN_HPP