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"""Image-load from svg files to Pygame images
Dependent on RSVG and Cairo libraries
"""
from olpcgames import _cairoimage
def load( file, (width, height)=(None,None) ):
"""pygame.load like interface for loading SVG graphics
file -- object with read() method (file-like object) or a string
filename for a file to be read off the local system
See render function for details of width and height
arguments
returns Pygame image instance
"""
try:
data = file.read()
except AttributeError, err:
data = open( file, 'r').read()
return render( data, (width,height) )
def render( data, (width, height)=(None,None) ):
"""Render SVG graphic/data to a Pygame image object
data -- SVG file for loading into the image, must be properly formed
and valid SVG to allow the rendering to complete
(width,height) -- size of the resulting image in pixels, the graphic will
be scaled to fit into the image.
If one dimension is left as None, then the graphic will be scaled to
fit the given dimension, with the other dimension provided by the
proportions of the graphic.
If both dimensions are left as None, then they will both be provided
by the "natural" dimensions of the SVG at the natural (GTK-defined)
resolution of the screen.
returns Pygame image instance
"""
import rsvg
handle = rsvg.Handle( data = data )
originalSize = (width,height)
scale = 1.0
hw,hh = handle.get_dimension_data()[:2]
if hw and hh:
if not width:
if not height:
width,height = hw,hh
else:
scale = float(height)/hh
width = hh/float(hw) * height
elif not height:
scale = float(width)/hw
height = hw/float(hh) * width
else:
# scale only, only rendering as large as it is...
if width/height > hw/hh:
# want it taller than it is...
width = hh/float(hw) * height
else:
height = hw/float(hh) * width
scale = float(height)/hh
csrf, ctx = _cairoimage.newContext( int(width), int(height) )
ctx.scale( scale, scale )
handle.render_cairo( ctx )
return _cairoimage.asImage( csrf )
return None
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