vnc

kvmd/apps/vnc/render.py

@@ -0,0 +1,53 @@
+# ========================================================================== #
+#                                                                            #
+#    KVMD - The main Pi-KVM daemon.                                          #
+#                                                                            #
+#    Copyright (C) 2020  Maxim Devaev <mdevaev@gmail.com>                    #
+#                                                                            #
+#    This program is free software: you can redistribute it and/or modify    #
+#    it under the terms of the GNU General Public License as published by    #
+#    the Free Software Foundation, either version 3 of the License, or       #
+#    (at your option) any later version.                                     #
+#                                                                            #
+#    This program is distributed in the hope that it will be useful,         #
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of          #
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           #
+#    GNU General Public License for more details.                            #
+#                                                                            #
+#    You should have received a copy of the GNU General Public License       #
+#    along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
+#                                                                            #
+# ========================================================================== #
+
+
+import sys
+import os
+import io
+import functools
+
+from PIL import Image
+from PIL import ImageDraw
+from PIL import ImageFont
+
+from ... import aiotools
+
+
+# =====
+async def make_text_jpeg(width: int, height: int, quality: int, text: str) -> bytes:
+    return (await aiotools.run_async(_inner_make_text_jpeg, width, height, quality, text))
+
+
+@functools.lru_cache(maxsize=10)
+def _inner_make_text_jpeg(width: int, height: int, quality: int, text: str) -> bytes:
+    image = Image.new("RGB", (width, height), color=(0, 0, 0))
+    draw = ImageDraw.Draw(image)
+    draw.multiline_text((20, 20), text, font=_get_font(), fill=(255, 255, 255))
+    bio = io.BytesIO()
+    image.save(bio, format="jpeg", quality=quality)
+    return bio.getvalue()
+
+
+@functools.lru_cache()
+def _get_font() -> ImageFont.FreeTypeFont:
+    path = os.path.join(os.path.dirname(sys.modules[__name__].__file__), "fonts", "Azbuka04.ttf")
+    return ImageFont.truetype(path, size=20)