84 lines
1.8 KiB
JavaScript
Executable File
84 lines
1.8 KiB
JavaScript
Executable File
#!/usr/bin/env node
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var fs = require('fs'),
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PNG = require('pngjs').PNG,
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RgbQuant = require('rgbquant');
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var data = fs.readFileSync(process.argv[2]);
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var png = PNG.sync.read(data);
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q = new RgbQuant();
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q.colors = 4;
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q.sample(png.data);
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pal = q.palette(false, true);
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//console.log(q);
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function readfonttxt(s) {
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var lines = s.split(/\r?\n/);// TODO
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}
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function remapBits(x, arr) {
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if (!arr) return x;
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var y = 0;
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for (var i=0; i<arr.length; i++) {
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var s = arr[i];
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if (s < 0) {
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s = -s-1;
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y ^= 1 << s;
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}
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if (x & (1 << i)) {
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y ^= 1 << s;
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}
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}
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return y;
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}
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function reorder(arrin, remap) {
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var out = [];
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for (var i=0; i<arrin.length; i++) {
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var j = remapBits(i, remap);
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//console.log(i,j);
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if (j >= arrin.length) throw i+" -> "+j+" >= "+arrin.length;
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out.push(arrin[j] | 0);
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}
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return out;
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}
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function packbits(arrin, bpp, brev) {
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var out = new Uint8Array((arrin.length * bpp) >> 3);
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for (var i=0; i<arrin.length; i++) {
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var j = (i * bpp) >> 3;
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var s = (i * bpp) & 7;
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if (brev) s = 8-bpp-s;
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out[j] |= arrin[i] << s;
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}
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return out;
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}
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function hex(n) {
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return (n < 16 ? "0" : "") + n.toString(16);
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}
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function dump(arr, bpl) {
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var s = '';
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for (var i=0; i<arr.length; i++) {
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if (i % bpl == 0) {
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s += '\n.byte ';
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} else {
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s += ',';
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}
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s += '$' + hex(arr[i]);
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}
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s += '\n';
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return s;
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}
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idximg = q.reduce(png.data, 2);
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//idximg = idximg.slice(0, 8*16*128);
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//idximg = idximg.slice(8*16*64);
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idx2 = reorder(idximg, [0,1,2,3,4,5,6,11,12,13,-8,-9,-10,-11]); // 8x16 font
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//idx2 = reorder(idximg, [0,1,2,3,5,6,11,12,13,99,-8,-9,-10,-5]); // 8x16 CHR tileset
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idx3 = packbits(idx2, 2, true);
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//console.log(idximg.length, idx2.length, idx3.length);
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console.log(dump(idx3, 8));
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console.log(";;",idx3.length,"bytes,",pal.length/4,'colors');
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