mirror of
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71 lines
2.4 KiB
Python
71 lines
2.4 KiB
Python
from typing import Dict, Any
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from io import BytesIO
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from PIL import Image, ImageDraw, ImageFont
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from fastapi.responses import Response
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from ..base import BaseProcessor
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class ImageWatermarkProcessor:
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name = "图片水印"
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supported_exts = ["jpg", "jpeg", "png", "bmp"]
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config_schema = [
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{"key": "text", "label": "水印文字", "type": "string", "required": True},
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{
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"key": "position",
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"label": "位置",
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"type": "select",
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"required": False,
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"default": "bottom-right",
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"options": [
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{"value": "top-left", "label": "左上"},
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{"value": "center", "label": "居中"},
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{"value": "bottom-right", "label": "右下"},
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],
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},
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{"key": "font_size", "label": "字体大小", "type": "number", "required": False, "default": 24},
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]
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produces_file = True
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async def process(self, input_bytes: bytes, path: str, config: Dict[str, Any]) -> Response:
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text = config.get("text", "")
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position = config.get("position", "bottom-right")
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font_size = int(config.get("font_size", 24))
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img = Image.open(BytesIO(input_bytes)).convert("RGBA")
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watermark = Image.new("RGBA", img.size)
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draw = ImageDraw.Draw(watermark)
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try:
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font = ImageFont.truetype("arial.ttf", font_size)
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except Exception:
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font = ImageFont.load_default()
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w, h = img.size
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try:
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text_w, text_h = font.getsize(text)
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except AttributeError:
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bbox = draw.textbbox((0, 0), text, font=font)
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text_w, text_h = bbox[2] - bbox[0], bbox[3] - bbox[1]
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if position == "bottom-right":
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xy = (w - text_w - 10, h - text_h - 10)
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elif position == "top-left":
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xy = (10, 10)
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else:
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xy = (w // 2 - text_w // 2, h // 2 - text_h // 2)
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draw.text(xy, text, font=font, fill=(255, 255, 255, 128))
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out = Image.alpha_composite(img, watermark)
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buf = BytesIO()
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out.convert("RGB").save(buf, format="JPEG")
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return Response(content=buf.getvalue(), media_type="image/jpeg")
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PROCESSOR_TYPE = "image_watermark"
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PROCESSOR_NAME = ImageWatermarkProcessor.name
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SUPPORTED_EXTS = ImageWatermarkProcessor.supported_exts
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CONFIG_SCHEMA = ImageWatermarkProcessor.config_schema
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PROCESSOR_FACTORY = lambda: ImageWatermarkProcessor()
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