Apple-2gs-SW/iigs-game-engine
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Fix palette assignment issue

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This commit is contained in:
Lucas Scharenbroich 2022-07-13 09:27:56 -05:00
parent 1b7c2c22b1
commit d2b91cfde6
1 changed files with 28 additions and 2 deletions
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30
tools/png2iigs.js
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@ -124,6 +124,7 @@ function getOptions(argv) {
const options = {};
options.startIndex = getArg(argv, '--start-index', x => parseInt(x, 10), 0);
options.asTileData = getArg(argv, '--as-tile-data', x => true, false);
options.verbose = getArg(argv, '--verbose', x => true, false);
options.maxTiles = getArg(argv, '--max-tiles', x => parseInt(x, 10), 511);
options.transparentIndex = getArg(argv, '--transparent-color-index', x => parseInt(x, 10), -1);
options.transparentColor = getArg(argv, '--transparent-color', x => x, null);
@ -133,16 +134,24 @@ function getOptions(argv) {
return options;
}
// Two steps here.
// First, the transparent color always gets mapped to Index 0 in the target palette
// Second, if a target palette is not explicit, then we create one based on the source
function getPaletteMap(options, png) {
// Get the RGB triplets from the palette
const sourcePalette = png.palette;
const targetPalette = options.targetPalette || sourcePalette;
const paletteCSSTripplets = sourcePalette.map(c => paletteToHexString(c));
if (options.verbose) {
console.warn('Source palette: ', paletteCSSTripplets.join(', '));
}
// Start with an identity map
const paletteMap = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
// If there is a transparent color / color index, make sure it gets mapped to index 0
// If there is a transparent color / color index, make sure it gets swapped to index 0
// If no target palette was passed in, swap the palette from the source copy, too
if (options.transparentIndex > 0) {
paletteMap[options.transparentIndex] = 0;
}
@ -156,8 +165,25 @@ function getPaletteMap(options, png) {
}
}
// If a target palette is not provided, build one from the source and (optional) transparentIndex\
let targetPalette;
if (!options.targetPalette) {
targetPalette = [...sourcePalette];
if (options.transparentIndex > 0) {
const tmp = targetPalette[options.transparentIndex];
targetPalette[options.transparentIndex] = targetPalette[0];
targetPalette[0] = tmp;
}
} else {
targetPalette = options.targetPalette;
}
// Match up the source palette with the target palette
const targetTriplets = targetPalette.map(c => paletteToHexString(c));
if (options.verbose) {
console.warn('Target palette: ', targetTriplets.join(', '));
}
paletteCSSTripplets.forEach((color, i) => {
if (i !== options.transparentIndex) {
const j = targetTriplets.findIndex(p => p === color);