Create LGTM image (GIF) with Scrimage

ScrimageLgtmGifGenerator.ipynb

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   "source": [
    "import com.sksamuel.scrimage.graphics.RichGraphics2D\n",
    "import com.sksamuel.scrimage.nio.AnimatedGifReader\n",
    "import com.sksamuel.scrimage.nio.StreamingGifWriter\n",
    "import com.sksamuel.scrimage.nio.ImageSource\n",
    "import java.awt.Color\n",
    "import java.awt.Font\n",
    "import java.awt.RenderingHints\n",
    "import java.awt.geom.Rectangle2D\n",
    "import java.awt.image.BufferedImage"
   ],
   "outputs": [],
   "execution_count": 15
  },
  {
   "metadata": {},
   "cell_type": "code",
   "source": [
    "// Read image\n",
    "val imageFile = File(\"test-image.gif\")\n",
    "val gif = AnimatedGifReader.read(ImageSource.of(imageFile))"
   ],
   "outputs": [],
   "execution_count": null
  },
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   },
   "cell_type": "code",
   "source": [
    "// Prepare text\n",
    "val text = \"LGTM\"\n",
    "val fontSize = gif.frames.first().width / 3\n",
    "val font = Font(\"Arial\", Font.BOLD, fontSize)"
   ],
   "outputs": [],
   "execution_count": 12
  },
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   "cell_type": "code",
   "source": [
    "// Render text on each frame\n",
    "val framesWithText = gif.frames.map { image ->\n",
    "    val g2 = RichGraphics2D(image.awt().createGraphics())\n",
    "    g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON)\n",
    "\n",
    "    g2.font = font\n",
    "    val textBounds = g2.fontMetrics.getStringBounds(text, g2)\n",
    "    val x = (image.width - textBounds.width) / 2\n",
    "    val y = (image.height - textBounds.height) / 2 + g2.fontMetrics.ascent\n",
    "\n",
    "    // Draw outline\n",
    "    val outlineOffset = 3\n",
    "    g2.color = Color.BLACK\n",
    "    for (dx in -outlineOffset..outlineOffset) {\n",
    "        for (dy in -outlineOffset..outlineOffset) {\n",
    "            if (dx != 0 || dy != 0) {\n",
    "                g2.drawString(text, (x + dx).toFloat(), (y + dy).toFloat())\n",
    "            }\n",
    "        }\n",
    "    }\n",
    "\n",
    "    // Draw text\n",
    "    g2.color = Color.WHITE\n",
    "    g2.drawString(text, x.toFloat(), y.toFloat())\n",
    "    g2.dispose()\n",
    "    \n",
    "    image\n",
    "}"
   ],
   "outputs": [],
   "execution_count": 13
  },
  {
   "metadata": {
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   },
   "cell_type": "code",
   "source": [
    "// Save image\n",
    "val writer = StreamingGifWriter()\n",
    "val newGif = writer.prepareStream(\"test-image-lgtm.gif\", BufferedImage.TYPE_INT_ARGB)\n",
    "newGif.use {\n",
    "    framesWithText.forEachIndexed { index, image ->\n",
    "        newGif.writeFrame(image, gif.getDelay(index))\n",
    "    }\n",
    "}"
   ],
   "outputs": [],
   "execution_count": 14
  }
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