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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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13
src/gfx/reverse.cpp
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@@ -195,10 +195,13 @@ void reverse() {
Options::VERB_INTERM, "Reversed image dimensions: %zux%zu tiles\n", width, height
);
std::vector<std::array<std::optional<Rgba>, 4>> palettes{
{Rgba(0xFFFFFFFF), Rgba(0xAAAAAAFF), Rgba(0x555555FF), Rgba(0x000000FF)}
Rgba const grayColors[4] = {
Rgba(0xFFFFFFFF), Rgba(0xAAAAAAFF), Rgba(0x555555FF), Rgba(0x000000FF)
};
// If a palette file is used as input, it overrides the default colors.
std::vector<std::array<std::optional<Rgba>, 4>> palettes{
{grayColors[0], grayColors[1], grayColors[2], grayColors[3]}
};
// If a palette file or palette spec is used as input, it overrides the default colors.
if (!options.palettes.empty()) {
File file;
if (!file.open(options.palettes, std::ios::in | std::ios::binary)) {
@@ -255,6 +258,10 @@ void reverse() {
putc('\n', stderr);
}
}
} else if (options.palSpecType == Options::DMG) {
for (size_t i = 0; i < palettes[0].size(); ++i) {
palettes[0][i] = grayColors[options.dmgValue(i)];
}
} else if (options.palSpecType == Options::EMBEDDED) {
warning("An embedded palette was requested, but no palette file was specified; ignoring "
"request.");