resvg-py

resvg-py provides a Python interface to the resvg library, an open-source Rust-based SVG rendering library that can be used to convert SVG images to various other formats such as PNG, PDF, and SVGZ.

The purpose of resvg-py is to provide a convenient way to use resvg from within Python code, without the need for external dependencies. By using resvg-py, developers can incorporate SVG rendering functionality directly into their Python applications, making it easier to work with SVG images and to create high-quality, scalable graphics for their projects.

With resvg-py, developers can:

• Load SVG files and render them to various output formats
• Control the output size, resolution, and quality of the rendered images
• Work with SVG images directly within their Python code, without the need for external tools or libraries

Overall, resvg-py provides a simple and powerful way to work with SVG images in Python, and can be a useful tool for developers who need to work with vector graphics in their projects.

Usage

from pathlib import Path

import resvg_py

options = resvg_py.SVGOptions()
r = resvg_py.Resvg(options)

with Path("resources/examples/svg/octocat.svg").open("r") as f:
    rendered = r.render(f.read(), 400, 400)

    with open("image.png", "wb") as f:
        f.write(rendered.as_png())

Options

The Options class within the resvg-py library is responsible for providing customization and configuration options for rendering SVG files. This class contains properties that define different aspects of the rendering process, such as dimensions, background color, and language. The following documentation will cover each property within the Options class, their purpose, and the allowed range of values.

Properties

Name	Purpose	Type	Allowed Values	Example
width	Defines the width of the output image in pixels	Integer	Positive integers (1 and above)	options.width = 300
height	Defines the height of the output image in pixels	Integer	Positive integers (1 and above)	options.height = 200
fit_to	Controls how the SVG should be scaled to fit the output	String or Tuple	"original", ("width", value), ("height", value), ("zoom", factor)	options.fit_to = ("width", 300)
background	Sets the background color of the output image	String or None	6 or 8-digit hex color codes or None	options.background = "#FFAABB"
dpi	Specifies the DPI value used for rendering	Float	Positive float values (greater than 0)	options.dpi = 96.0
languages	Sets the list of languages for systemLanguage attribute	List of strings	Valid BCP 47 language codes	options.languages = ["en", "fr", "es"]
shape_rendering	Controls the rendering mode for shapes	String	optimizeSpeed", "crispEdges", "geometricPrecision	options.shape_rendering = "optimizeSpeed"
text_rendering	Controls the rendering mode for text	String	optimizeSpeed", "optimizeLegibility", "geometricPrecision	options.text_rendering = "optimizeLegibility"
image_rendering	Controls the rendering mode for images	String	optimizeQuality", "optimizeSpeed", "pixelated	options.image_rendering = "optimizeQuality"
skip_system_fonts	Skip loading system fonts when rendering text	Boolean	True or False	options.skip_system_fonts = True
font_size	Specifies the default font size for text elements	Float	Positive float values (greater than 0)	options.font_size = 14.0
font_family	Specifies the default font family for text elements	String	Valid font family names	options.font_family = "Arial"
font_path	Path to a custom font file	String	Valid file path	options.font_path = "path/to/font.ttf"

Example Usage

from resvg import Options, render_from_file

options = Options()
options.width = 300
options.height = 200
options.background = "#FFAABB"
options.dpi = 96.0
options.languages = ["en", "fr", "es"]
options.shape_rendering = "optimizeSpeed"
options.text_rendering = "optimizeLegibility"
options.image_rendering = "optimizeQuality"

output_image = render_from_file("input.svg", options)

How To Build

Install Rust, Set up Python Dev Requirements

Windows

choco install rust

Set up Virtual Environemt

python -m venv venv
.\venv\Scripts\Activate.bat

Install Maturin and Pytest

pip install -r requirements-dev.txt

Build Python Wheel

maturin develop

Run Tests

pytest

To update the snapshots:

pytest --snapshot-update