SVG rendering in a PyGame application

Question

In a pyGame application, I would like to render resolution-free GUI widgets described in SVG.

What tool and/or library can I use to reach this goal ?

(I like the OCEMP GUI toolkit but it seems to be bitmap dependent for its rendering)

Answer 1

You can use Cairo (with PyCairo), which has support for rendering SVGs. The PyGame webpage has a HOWTO for rendering into a buffer with a Cairo, and using that buffer directly with PyGame.

Answer 2

I realise this doesn't exactly answer your question, but there's a library called Squirtle that will render SVG files using either Pyglet or PyOpenGL.

Answer 3

Cairo cannot render SVG out of the box. It seems we have to use librsvg.

Just found those two pages:

• Rendering SVG with libRSVG,Python and c-types
• How to use librsvg from Python

Something like this should probably work (render test.svg to test.png):

import cairo
import rsvg

WIDTH, HEIGHT  = 256, 256
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, WIDTH, HEIGHT)

ctx = cairo.Context (surface)

svg = rsvg.Handle(file="test.svg")
svg.render_cairo(ctx)

surface.write_to_png("test.png")

Answer 4

pygamesvg seems to do what you want (though I haven't tried it).

Answer 5

This is a complete example (beware untested) which combines hints by other people here. It should render a file called test.svg from the current directory.

import array
import math

import cairo
import pygame
import rsvg

WIDTH = 512
HEIGHT = 512

data = array.array('c', chr(0) * WIDTH * HEIGHT * 4)
surface = cairo.ImageSurface.create_for_data(
    data, cairo.FORMAT_ARGB32, WIDTH, HEIGHT, WIDTH * 4)

pygame.init()
window = pygame.display.set_mode((WIDTH, HEIGHT))
svg = rsvg.Handle(file="test.svg")
svg.render_cairo(surface)

screen = pygame.display.get_surface()
image = pygame.image.frombuffer(data.tostring(), (WIDTH, HEIGHT),"ARGB")
screen.blit(image, (0, 0)) 
pygame.display.flip() 

clock = pygame.time.Clock()
while True:
    clock.tick(15)
    for event in pygame.event.get():
        if event.type == pygame.locals.QUIT:
            raise SystemExit

Answer 6

The pygamesvg link appears to be broken. I guess Cairo + rsvg is the best bet for now.