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Merge pull request #61 from heyzec/svg2png
Partial solution to remove ImageMagick dependency (#46)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| #!/usr/bin/env python3 | ||
|
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||
| import os | ||
| import re | ||
| import subprocess | ||
| import xml.etree.ElementTree as ET | ||
| import xml.dom.minidom | ||
|
|
||
| def inkscape_convert_svg2png(color, src_path, dst_path): | ||
| SVG_URI = 'http://www.w3.org/2000/svg' | ||
| FRAC = 0.7 | ||
| TEMPFILE = 'temp.svg' | ||
|
|
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| def parse_with_map(source): | ||
| """Parses file, returns a tuple containing the parsed ElementTree and a namespace map (dict). | ||
| The ElementTree object returned is the same as if parsed using xml.etree.ElementTree.parse. For | ||
| some reason, ElementTree objects by the xml package will not provide a namespace map, unlike the | ||
| lxml package. | ||
| """ | ||
|
|
||
| root = None | ||
| ns_map = [] | ||
| for event, node in ET.iterparse(source, events=['start-ns', 'start']): | ||
| if event == 'start-ns': | ||
| ns_map.append(node) | ||
| elif event == 'start': | ||
| if root is None: | ||
| root = node | ||
| return (ET.ElementTree(root), dict(ns_map)) | ||
|
|
||
| def int_ignore_units(s): | ||
| return int(''.join(ch for ch in s if ch.isdigit())) | ||
|
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| def prettify(xml_string): | ||
| return '\n'.join(line for line in xml.dom.minidom.parseString(xml_string).toprettyxml( | ||
| indent=' ').splitlines() if not line.isspace() and line != '') | ||
|
|
||
| # Fixes undefined namespace tags in output xml (not a big issue) | ||
| dom, ns_map = parse_with_map(src_path) | ||
| for key, value in ns_map.items(): | ||
| ET.register_namespace(key, value) | ||
|
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||
| root = dom.getroot() | ||
| width, height = int_ignore_units(root.attrib['width']), int_ignore_units(root.attrib['height']) | ||
| width_gap, height_gap = (1-FRAC)*width/2, (1-FRAC)*height/2 | ||
|
|
||
| # Group all elements that are children of <svg> while changing their 'style' attributes | ||
| elements = root.findall('svg:*', namespaces={'svg': SVG_URI}) | ||
| group = ET.SubElement(root, 'g') | ||
| for element in elements: | ||
| if any(map(element.tag.endswith, ['defs', 'metadata'])): # Don't group these special tags | ||
| continue | ||
| root.remove(element) | ||
| for child in element.iter(): # Changes all decendents (.iter will also include itself) | ||
| if 'style' in child.attrib: | ||
| child.attrib['style'] = re.sub(r'(?<=fill:)\S+?(?=;)', color, child.attrib['style']) | ||
| else: | ||
| child.attrib['style'] = f'fill:{color};' | ||
| group.append(element) | ||
| # Shrink the svg by a factor of FRAC for padding around icon | ||
| group.attrib['transform'] = f"matrix({FRAC},0,0,{FRAC},{width_gap},{height_gap})" | ||
|
|
||
| xml_string = ET.tostring(root).decode() | ||
| xml_string = prettify(xml_string) | ||
| with open(TEMPFILE, 'w') as f: | ||
| f.write(xml_string) | ||
|
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||
|
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||
| # Check inkscape version | ||
| version_string = subprocess.run('inkscape --version 2>/dev/null', | ||
| shell=True, capture_output=True).stdout.decode() | ||
| version = re.findall(r'(?<=Inkscape )[.\d]+', version_string)[0] | ||
| if version[0] == '1': | ||
| arguments = [f'--export-filename={dst_path}'] | ||
| elif version[0] == '0': | ||
| arguments = ['--without-gui', f'--export-png={dst_path}'] | ||
| arguments.extend([TEMPFILE, '-w', '72']) | ||
|
|
||
| inkscape_proc = subprocess.Popen(['inkscape', *arguments], | ||
| stdout=subprocess.PIPE, stderr=subprocess.STDOUT) | ||
| subprocess.run(['sed', 's/^/inkscape: /'], stdin=inkscape_proc.stdout) | ||
| inkscape_proc.wait() | ||
| exit_code = inkscape_proc.returncode | ||
| # Alternative - Using bash to pipe | ||
| # cmd = f"""/bin/bash -c 'inkscape {' '.join(arguments)} 2>&1 | sed "s/^/inkscape: /"; exit ${{PIPESTATUS[0]}}'""" | ||
| # exit_code = os.system(cmd) | ||
|
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||
| os.remove(TEMPFILE) | ||
| return exit_code | ||
|
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||
| def magick_convert_svg2png(color, src_path, dst_path): | ||
| cmd = ( | ||
| r"convert -trim -scale 36x36 -extent 72x72 -gravity center " | ||
| r"-define png:color-type=6 -background none -colorspace sRGB -channel RGB " | ||
| rf"-threshold -1 -density 300 -fill \{color} +opaque none " | ||
| rf"{src_path} {dst_path}" | ||
| ) | ||
| return os.system(cmd) | ||
|
|
||
| # For demostration purposes | ||
| if __name__ == '__main__': | ||
| svg2png = inkscape_convert_svg2png | ||
| # svg2png = magick_convert_svg2png | ||
| for file in os.listdir('./icons'): | ||
| basename, ext = os.path.splitext(file) | ||
| if ext == '.svg': | ||
| svg2png('#FFFFFF', f'icons/{basename}.svg', f'icons/{basename}.png') |
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