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Author: Mqxx

src/format/render_bit_map.ts

@@ -0,0 +1,35 @@
+const lowerPixelChar = '\u2584';
+const upperPixelChar = '\u2580';
+const fullBlockChar = '\u2588';
+
+export function renderBitMap(
+  bitMap: boolean[],
+  width: number,
+  height: number
+): string {
+  let result = '';
+
+  for (let bitMapY = 0; bitMapY < height; bitMapY += 2) {
+    for (let bitMapX = 0; bitMapX < width; bitMapX++) {
+      const upperPixel = bitMap[bitMapY * width + bitMapX];
+      const lowerPixel = (bitMapY + 1 < height) ? bitMap[(bitMapY + 1) * width + bitMapX] : false;
+
+      if (upperPixel && lowerPixel) {
+        // Both pixels set
+        result += '\x1b[37m' + fullBlockChar + '\x1b[0m';
+      } else if (upperPixel && !lowerPixel) {
+        // Upper pixel set
+        result += '\x1b[37;48;5;16m' + upperPixelChar + '\x1b[0m';
+      } else if (!upperPixel && lowerPixel) {
+        // Lower pixel set
+        result += '\x1b[37;48;5;16m' + lowerPixelChar + '\x1b[0m';
+      } else {
+        // No pixels set
+        result += '\x1b[30m' + fullBlockChar + '\x1b[0m';
+      }
+    }
+    result += '\n';
+  }
+
+  return result;
+}