Whatevers

scripts/png2gb/index.js

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