fix: mac输出png透明度问题.

utils/io.py

@@ -4,6 +4,7 @@ from lxml import etree
 from svglib.svglib import svg2rlg
 from reportlab.graphics import renderPM
 from utils.platform import *
+from settings import *
 
 def svg2png(dwg, content_width, content_height, svg_file_path, png_file_path):
     dwg.save()
@@ -30,7 +31,12 @@ def svg2png(dwg, content_width, content_height, svg_file_path, png_file_path):
         cairosvg.svg2png(url=svg_file_path, write_to=png_file_path)
     elif is_darwin():
         drawing = svg2rlg(svg_file_path)
-        renderPM.drawToFile(drawing, png_file_path, fmt='PNG')
+        image = renderPM.drawToPIL(d=drawing, bg=0xff00ff)
+        image = image.convert('RGBA')
+        data = image.getdata()
+        new_data = [(255, 255, 255, 0) if item[:3] == (255, 0, 255) else item for item in data]
+        image.putdata(new_data)
+        image.save(png_file_path, fmt='PNG')
     else:
         exit(-1)