89 lines
2.5 KiB
JavaScript
89 lines
2.5 KiB
JavaScript
const PNG = require('pngjs').PNG;
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const fs = require('fs');
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const convert = (fileIn, fileOut) => {
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const TILE_WIDTH = 8;
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const TILE_HEIGHT = 8;
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const data = fs.readFileSync(fileIn);
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const png = PNG.sync.read(data);
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const getPixelValue = (pixel) => {
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if(pixel.r === 15) return 3;
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if(pixel.r === 48) return 2;
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if(pixel.r === 0) return 1;
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if(pixel.r === 155) return 0;
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throw new Error();
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}
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// Convert PNG pixels into 0x00-0x03
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const pixels = [];
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for(let x = 0; x < png.width; x++) {
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for(let y = 0; y < png.height; y++) {
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const id = x + (y * png.width);
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const idx = id << 2;
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const r = png.data[idx];
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const g = png.data[idx+1];
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const b = png.data[idx+2];
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const value = getPixelValue({ r, g, b });
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pixels.push(value);
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}
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}
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// Now take these raw pixels and extract the tiles themselves
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let rearranged = [];
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const columns = (png.width / TILE_WIDTH);
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const rows = (png.height / TILE_HEIGHT);
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let n = 0;
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for(let i = 0; i < columns * rows; i++) {
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const tileX = i % columns;
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const tileY = Math.floor(i / columns) % rows;
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for(let x = 0; x < TILE_WIDTH; x++) {
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for(let y = 0; y < TILE_HEIGHT; y++) {
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const px = (tileY * TILE_WIDTH) + x;// NO idea why I need to flipX/Y.
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const py = (tileX * TILE_HEIGHT) + y;// and too lazy to figure out why.
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const pi = px + (py * png.width);
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rearranged[n++] = pixels[pi];
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}
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}
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}
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// Now turn into a tileset
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const bits = [];
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for(let i = 0; i < rearranged.length; i += TILE_WIDTH) {
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let lowBits = 0x00;
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let highBits = 0x00;
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for(let j = 0; j < TILE_WIDTH; j++) {
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const pixel = rearranged[i + j];
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lowBits = lowBits | ((pixel & 0x01) << (7-j));
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highBits = highBits | ((pixel & 0x02) >> 1 << (7-j));
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}
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bits.push(lowBits, highBits);
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}
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const b = bits.map(n => {
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return '0x' + (n.toString(16).padStart(2, '0').toUpperCase());
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});
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let str = '';
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for(let i = 0; i < b.length; i += 16) {
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str += ' ';
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for(let x = i; x < Math.min(i+16, b.length); x++) {
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str += b[x];
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str += ',';
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}
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str += '\n';
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}
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let out = '';
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out += `#include "../libs.h"\n\n`
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out += `#define IMAGE_WIDTH ${png.width}\n`;
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out += `#define IMAGE_HEIGHT ${png.height}\n`;
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out += `#define IMAGE_TILES ${columns * rows}\n`;
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out += `\nconst uint8_t IMAGE[] = {\n${str}};`;
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fs.writeFileSync(fileOut, out);
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require('./../gb2png/')(bits, `${fileOut}.png`);
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}
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convert('images/font.png', 'out.c'); |