Apple-2gs-SW
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iigs-game-engine
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Improve transparent / background color handling when generating tiles

This commit is contained in:
Lucas Scharenbroich 2021-11-02 21:59:08 -05:00
parent 3a5d2cb3ad
commit 2f40c79ddf
1 changed files with 75 additions and 70 deletions
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145
tools/png2iigs.js
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@ -4,12 +4,6 @@ const process = require('process');
const { Buffer } = require('buffer');
const StringBuilder = require('string-builder');
// Starting color index
let startIndex = 0;
let transparentColor = 0;
let transparentIndex = -1;
let maxTiles = 511;
main(process.argv.slice(2)).then(
() => process.exit(0),
(e) => {
@ -18,24 +12,24 @@ main(process.argv.slice(2)).then(
}
);
function findColorIndex(png, pixel) {
function findColorIndex(options, png, pixel) {
for (let i = 0; i < png.palette.length; i += 1) {
const color = png.palette[i].slice(0, pixel.length); // Handle RGB or RGBA
if (color.every((c, idx) => c === pixel[idx])) {
return i + startIndex;
return i + options.startIndex;
}
}
return null;
}
function pngToIIgsBuff(png) {
function pngToIIgsBuff(options, png) {
let i = 0;
const buff = Buffer.alloc(png.height * (png.width / 2), 0);
for (let y = 0; y < png.height; y += 1) {
for (let x = 0; x < png.width; x += 1, i += 4) {
const pixel = png.data.slice(i, i + 4);
const index = findColorIndex(png, pixel);
const index = findColorIndex(options, png, pixel);
const j = y * (png.width / 2) + Math.floor(x / 2);
if (index > 15) {
@ -65,13 +59,13 @@ function shiftImage(src) {
return dst;
}
function pngToIIgsBuffRepeat(png) {
function pngToIIgsBuffRepeat(options, png) {
let i = 0;
const buff = Buffer.alloc(png.height * png.width, 0);
for (let y = 0; y < png.height; y += 1) {
for (let x = 0; x < png.width; x += 1, i += 4) {
const pixel = png.data.slice(i, i + 4);
const index = findColorIndex(png, pixel);
const index = findColorIndex(options, png, pixel);
const j = y * png.width + Math.floor(x / 2);
if (index > 15) {
@ -93,6 +87,14 @@ function pngToIIgsBuffRepeat(png) {
return buff;
}
function hexStringToPalette(hex) {
return [
parseInt(hex.slice(0,2), 16),
parseInt(hex.slice(2,4), 16),
parseInt(hex.slice(4,6), 16)
];
}
function paletteToHexString(palette) {
const r = Math.round(palette[0]);
const g = Math.round(palette[1]);
@ -140,20 +142,24 @@ async function readPNG(filename) {
return png;
}
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.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);
options.backgroundColor = getArg(argv, '--background-color', x => x, null);
return options;
}
async function main(argv) {
try {
// try {
const png = await readPNG(argv[0]);
const options = getOptions(argv);
startIndex = getArg(argv, '--start-index', x => parseInt(x, 10), 0);
asTileData = getArg(argv, '--as-tile-data', null, 0);
maxTiles = getArg(argv, '--max-tiles', x => parseInt(x, 10), 511);
transparentColor = getArg(argv, '--transparent-color-index', x => parseInt(x, 10), -1);
if (transparentColor !== -1) {
transparentIndex = transparentColor;
}
console.info(`; startIndex = ${startIndex}`);
console.info(`; startIndex = ${options.startIndex}`);
if (png.colorType !== 3) {
console.warn('; PNG must be in palette color type');
@ -166,53 +172,54 @@ async function main(argv) {
}
// Get the RGB triplets from the palette
const palette = png.palette.map(c => paletteToHexString(c));
transparentColorTriple = getArg(argv, '--transparent-color', x => x, null);
if (transparentColorTriple) {
console.log('; Looking for transparent color', transparentColorTriple);
transparentIndex = palette.findIndex(p => p === transparentColorTriple);
if (transparentIndex !== -1) {
console.log('; found color at palette index', transparentIndex);
const palette = png.palette;
const paletteCSSTripplets = palette.map(c => paletteToHexString(c));
// If there is a transparent color / color index, make sure it gets shuffled
// into index 0
if (options.transparentIndex > 0) {
[palette[0], palette[options.transparentIndex]] = [palette[options.transparentIndex], palette[0]];
options.transparentIndex = 0;
}
if (options.transparentColor !== null) {
const index = paletteCSSTripplets.findIndex(p => p === options.transparentColor);
if (index !== -1) {
options.transparentIndex = 0;
[palette[0], palette[index]] = [palette[index], palette[0]];
} else {
console.warn(`; transparent color defined, ${options.transparentColor}, but not found in image`);
}
}
// Dump the palette in IIgs hex format
console.log('; Palette:');
const hexCodes = png.palette.map(c => '$' + paletteToIIgs(c));
const hexCodes = palette.map(c => '$' + paletteToIIgs(c));
if (options.backgroundColor !== null) {
hexCodes[options.transparentIndex] = '$' + paletteToIIgs(hexStringToPalette(options.backgroundColor));
}
console.log(';', hexCodes.join(','));
// Just convert a paletted PNG to IIgs memory format. We make sure that only a few widths
// are supported
let buff = null;
if (png.width === 512) {
console.log('; Converting to BG1 format...');
buff = pngToIIgsBuff(png);
}
if (png.width === 256) {
console.log('; Converting to BG1 format w/repeat...');
buff = pngToIIgsBuffRepeat(png);
}
if (png.width === 328 || png.width == 320) {
console.log('; Converting to BG0 format...');
buff = pngToIIgsBuff(png);
}
console.log('; Converting to BG0 format...');
buff = pngToIIgsBuff(options, png);
if (buff && argv[1]) {
if (asTileData) {
writeToTileDataSource(buff, png.width / 2, maxTiles);
if (options.asTileData) {
writeToTileDataSource(options, buff, png.width / 2);
}
else {
console.log(`; Writing to output file ${argv[1]}`);
await writeBinayOutput(argv[1], buff);
await writeBinayOutput(options, argv[1], buff);
}
}
} catch (e) {
console.log(`; ${e}`);
process.exit(1);
}
//}
// catch (e) {
// console.log(`; ${e}`);
// process.exit(1);
//}
}
function reverse(str) {
@ -250,7 +257,7 @@ function toMask(hex, transparentIndex) {
/**
* Return all four 32 byte chunks of data for a single 8x8 tile
*/
function buildTile(buff, width, x, y, transparentIndex = -1) {
function buildTile(options, buff, width, x, y) {
const tile = {
isSolid: true,
normal: {
@ -271,7 +278,7 @@ function buildTile(buff, width, x, y, transparentIndex = -1) {
const hex3 = buff[offset + dy * width + 3];
const raw = [hex0, hex1, hex2, hex3];
const mask = raw.map(h => toMask(h, transparentIndex));
const mask = raw.map(h => toMask(h, options.transparentIndex));
const data = raw.map((h, i) => h & ~mask[i]);
tile.normal.data.push(data);
@ -290,7 +297,7 @@ function buildTile(buff, width, x, y, transparentIndex = -1) {
const hex3 = swap(buff[offset + dy * width + 3]);
const raw = [hex3, hex2, hex1, hex0];
const mask = raw.map(h => toMask(h, transparentIndex));
const mask = raw.map(h => toMask(h, options.transparentIndex));
const data = raw.map((h, i) => h & ~mask[i]);
tile.flipped.data.push(data);
@ -300,16 +307,16 @@ function buildTile(buff, width, x, y, transparentIndex = -1) {
return tile;
}
function buildTiles(buff, width, transparentIndex = -1) {
function buildTiles(options, buff, width) {
const tiles = [];
let count = 0;
for (let y = 0; ; y += 8) {
for (let x = 0; x < width; x += 4, count += 1) {
if (count >= maxTiles) {
if (count >= options.maxTiles) {
return tiles;
}
const tile = buildTile(buff, width, x, y, transparentIndex);
const tile = buildTile(options, buff, width, x, y);
// Tiled TileIDs start at 1
tile.tileId = count + 1;
@ -326,15 +333,14 @@ function writeTileToStream(stream, data) {
}
}
function writeTilesToStream(stream, tiles, label='tiledata') {
function writeTilesToStream(options, stream, tiles, label='tiledata') {
stream.write(`${label} ENT\n`);
stream.write('');
stream.write('; Reserved space (tile 0 is special...)\n');
stream.write(' ds 128\n');
const MAX_TILES = 511;
let count = 0;
for (const tile of tiles.slice(0, MAX_TILES)) {
for (const tile of tiles.slice(0, options.maxTiles)) {
console.log(`Writing tile ${count + 1}`);
stream.write(`; Tile ID ${count + 1}, isSolid: ${tile.isSolid}\n`);
writeTileToStream(stream, tile.normal.data);
@ -359,16 +365,15 @@ function buildMerlinCodeForTile(data) {
return sb.toString();
}
function buildMerlinCodeForTiles(tiles, label='tiledata') {
function buildMerlinCodeForTiles(options, tiles, label='tiledata') {
const sb = new StringBuilder();
sb.appendLine(`${label} ENT`);
sb.appendLine();
sb.appendLine('; Reserved space (tile 0 is special...)');
sb.appendLine(' ds 128');
const MAX_TILES = 511;
let count = 0;
for (const tile of tiles.slice(0, MAX_TILES)) {
for (const tile of tiles.slice(0, options.maxTiles)) {
console.log(`Writing tile ${count + 1}`);
sb.appendLine(`; Tile ID ${count + 1}, isSolid: ${tile.isSolid}`);
sb.append(buildMerlinCodeForTile(tile.normal.data));
@ -383,7 +388,7 @@ function buildMerlinCodeForTiles(tiles, label='tiledata') {
return sb.toString();
}
function writeToTileDataSource(buff, width, MAX_TILES = 64) {
function writeToTileDataSource(options, buff, width) {
console.log('tiledata ENT');
console.log();
console.log('; Reserved space (tile 0 is special...');
@ -392,13 +397,13 @@ function writeToTileDataSource(buff, width, MAX_TILES = 64) {
let count = 0;
for (let y = 0; ; y += 8) {
for (let x = 0; x < width; x += 4, count += 1) {
if (count >= MAX_TILES) {
if (count >= options.maxTiles) {
return;
}
console.log('; Tile ID ' + (count + 1));
console.log('; From image coordinates ' + (x * 2) + ', ' + y);
const tile = buildTile(buff, width, x, y, transparentIndex);
const tile = buildTile(options, buff, width, x, y);
// Output the tile data
for (const row of tile.normal.data) {
@ -431,7 +436,7 @@ function writeToTileDataSource(buff, width, MAX_TILES = 64) {
}
}
async function writeBinayOutput(filename, buff) {
async function writeBinayOutput(options, filename, buff) {
// Write a small header. This is useful and avoids triggering a sparse file load
// bug when the first block of the file on the GS/OS drive is sparse.
@ -440,10 +445,10 @@ async function writeBinayOutput(filename, buff) {
header.write('GTERAW', 'latin1');
// Use the special value $A5A5 to identify no transparency
if (typeof transparentColor !== 'number') {
if (options.transparentIndex < 0) {
header.writeUInt16LE(0xA5A5);
} else {
header.writeUInt16LE(0x1111 * transparentColor, 6);
header.writeUInt16LE(0x1111 * options.transparentIndex, 6);
}
await fs.writeFile(filename, Buffer.concat([header, buff]));