diff options
Diffstat (limited to 'sugar_network/model/context.py')
| -rw-r--r-- | sugar_network/model/context.py | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/sugar_network/model/context.py b/sugar_network/model/context.py index 772a71a..41bf46b 100644 --- a/sugar_network/model/context.py +++ b/sugar_network/model/context.py @@ -13,6 +13,7 @@ # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. +from cStringIO import StringIO from os.path import join from sugar_network import db, model, static @@ -129,3 +130,41 @@ class Context(db.Resource): @db.stored_property(typecast=dict, default={}, acl=ACL.PUBLIC | ACL.LOCAL) def packages(self, value): return value + + @staticmethod + def image_props(svg): + icon = StringIO(svg.read()) + return {'artifact_icon': { + 'blob': icon, + 'mime_type': 'image/svg+xml', + }, + 'icon': { + 'blob': _svg_to_png(icon.getvalue(), 55, 55), + 'mime_type': 'image/png', + }, + 'preview': { + 'blob': _svg_to_png(icon.getvalue(), 160, 120), + 'mime_type': 'image/png', + }, + } + + +def _svg_to_png(data, w, h): + import rsvg + import cairo + + svg = rsvg.Handle(data=data) + surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, w, h) + context = cairo.Context(surface) + + scale = min(float(w) / svg.props.width, float(h) / svg.props.height) + context.translate( + int(w - svg.props.width * scale) / 2, + int(h - svg.props.height * scale) / 2) + context.scale(scale, scale) + svg.render_cairo(context) + + result = StringIO() + surface.write_to_png(result) + result.seek(0) + return result |