Improving compiler.

scripts/png2gb.js

@@ -0,0 +1,85 @@
+const PNG = require('pngjs').PNG;
+const fs = require('fs');
+const { arrayToString } = require('./util');
+const {
+  TILE_WIDTH,
+  TILE_HEIGHT
+} = require('./common');
+
+
+const getPixelValue = (pixel) => {
+  if(pixel.g === 188) return 0;
+  if(pixel.g === 172) return 1;
+  if(pixel.g === 98) return 2;
+  if(pixel.g === 56) return 3;
+  throw new Error();
+}
+
+const png2gb = (fileIn, fileOut, name) => {
+
+  const data = fs.readFileSync(fileIn);
+  const png = PNG.sync.read(data);
+
+  // Convert PNG pixels into 0x00-0x03
+  const pixels = [];
+  for(let y = 0; y < png.height; y++) {
+    for(let x = 0; x < png.width; x++) {
+      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 y = 0; y < TILE_HEIGHT; y++) {
+      for(let x = 0; x < TILE_WIDTH; x++) {
+        const px = (tileX * TILE_WIDTH) + x;
+        const py = (tileY * TILE_HEIGHT) + y;
+        const pi = (py * png.width) + px;
+        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);
+  }
+
+  let out = '';
+  out += `#include "libs.h"\n\n`
+  out += `#define ${name}_IMAGE_WIDTH ${png.width}\n`;
+  out += `#define ${name}_IMAGE_HEIGHT ${png.height}\n`;
+  out += `#define ${name}_IMAGE_COLUMNS ${png.width / TILE_WIDTH}\n`;
+  out += `#define ${name}_IMAGE_ROWS ${png.height / TILE_HEIGHT}\n`;
+  out += `#define ${name}_IMAGE_TILES ${columns * rows}\n`;
+  out += `\nconst uint8_t ${name}_IMAGE[] = {\n${arrayToSTring(bits)}};`;
+
+  fs.writeFileSync(fileOut, out);
+}
+
+module.exports = {
+  png2gb
+}
+
+// convert('images/sm.png', 'out.c', 'PENNY');