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