Get use of CairoSVG for rasterization.

requirements.txt

@@ -1,9 +1,11 @@
+CairoSVG~=2.5.0
 colour~=0.1.5
+logging~=0.4.9.6
 numpy>=1.18.1
 portolan~=1.0.1
 pycairo
-pytest
-pyyaml>=4.2b1
-shapely
+pytest~=6.2.2
+PyYAML>=4.2b1
+Shapely
 svgwrite~=1.4
 urllib3>=1.25.6

roentgen/raster.py

@@ -1,35 +0,0 @@
-"""
-Rasterize vector graphics using Inkscape.
-"""
-import logging
-import os
-import subprocess
-from pathlib import Path
-
-__author__ = "Sergey Vartanov"
-__email__ = "me@enzet.ru"
-
-INKSCAPE_BIN: str = "INKSCAPE_BIN"
-
-
-def rasterize(from_: Path, to_: Path, area: str = "", dpi: float = 90) -> None:
-    """
-    Make PNG image out of SVG using Inkscape.
-
-    See https://inkscape.org/
-    """
-    if "INKSCAPE_BIN" not in os.environ:
-        logging.fatal(
-            f"Environment variable {INKSCAPE_BIN} not set. Please, install "
-            f"Inkscape and set the variable to be able to rasterize SVG files."
-        )
-
-    commands: list[str] = [os.environ[INKSCAPE_BIN]]
-    commands += ["--export-png", to_.absolute()]
-    commands += ["--export-dpi", str(dpi)]
-    if area:
-        commands += ["--export-area", area]
-    commands += [from_.absolute()]
-
-    logging.info(f"Rasterize SVG file to {to_}...")
-    subprocess.run(commands)

roentgen/server.py

@@ -6,7 +6,8 @@ from http.server import BaseHTTPRequestHandler, HTTPServer
 from pathlib import Path
 from typing import Optional
 
-from roentgen.raster import rasterize
+import cairosvg
+
 from roentgen.tile import Tile
 from roentgen.workspace import workspace
 
@@ -42,7 +43,8 @@ class Handler(BaseHTTPRequestHandler):
                 if not svg_path.exists():
                     tile = Tile(x, y, zoom)
                     tile.draw(tile_path, self.cache)
-                rasterize(svg_path, png_path)
+                cairosvg.svg2png(file_obj=svg_path, write_to=str(png_path))
+                logging.info(f"SVG file is rasterized to {png_path}.")
         if zoom != 18:
             return
         if png_path.exists():

roentgen/tile.py

@@ -9,6 +9,7 @@ from dataclasses import dataclass
 from pathlib import Path
 from typing import Optional
 
+import cairosvg
 import numpy as np
 import svgwrite
 
@@ -18,7 +19,6 @@ from roentgen.icon import ShapeExtractor
 from roentgen.mapper import Map
 from roentgen.osm_getter import NetworkError, get_osm
 from roentgen.osm_reader import OSMData, OSMReader
-from roentgen.raster import rasterize
 from roentgen.scheme import Scheme
 from roentgen.ui import BoundaryBox
 from roentgen.util import MinMax
@@ -84,7 +84,8 @@ class Tiles:
 
             output_path: Path = file_path.with_suffix(".png")
             if not output_path.exists():
-                rasterize(file_path, output_path)
+                cairosvg.svg2png(file_obj=file_path, write_to=str(output_path))
+                logging.info(f"SVG file is rasterized to {output_path}.")
             else:
                 logging.info(f"File {output_path} already exists.")
 
@@ -135,7 +136,8 @@ class Tiles:
 
         png_path: Path = cache_path / f"{self.boundary_box.get_format()}.png"
         if not png_path.exists():
-            rasterize(output_path, png_path)
+            cairosvg.svg2png(file_obj=output_path, write_to=str(png_path))
+            logging.info(f"SVG file is rasterized to {png_path}.")
         else:
             logging.info(f"File {png_path} already exists.")