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-rw-r--r--toolkit/pixbuf.py116
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diff --git a/toolkit/pixbuf.py b/toolkit/pixbuf.py
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+# Copyright (C) 2009, Aleksey Lim
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+
+"""gtk.gdk.Pixbuf extensions"""
+
+import re
+import cStringIO
+import gtk
+import rsvg
+import cairo
+import logging
+
+from sugar.graphics import style
+from sugar.graphics.xocolor import XoColor, is_valid
+from sugar.util import LRU
+
+
+def to_file(pixbuf):
+ """Convert pixbuf object to file object"""
+
+ def push(pixbuf, buffer):
+ buffer.write(pixbuf)
+
+ buffer = cStringIO.StringIO()
+ pixbuf.save_to_callback(push, 'png', user_data=buffer)
+ buffer.seek(0)
+
+ return buffer
+
+def to_str(pixbuf):
+ """Convert pixbuf object to string"""
+ return to_file(pixbuf).getvalue()
+
+def from_str(str):
+ """Convert string to pixbuf object"""
+
+ loader = gtk.gdk.pixbuf_loader_new_with_mime_type('image/png')
+
+ try:
+ loader.write(str)
+ except Exception, e:
+ logging.error('pixbuf.from_str: %s' % e)
+ return None
+ finally:
+ loader.close()
+
+ return loader.get_pixbuf()
+
+
+def at_size_with_ratio(pixbuf, width, height, type=gtk.gdk.INTERP_BILINEAR):
+ image_width = pixbuf.get_width()
+ image_height = pixbuf.get_height()
+
+ ratio_width = float(width) / image_width
+ ratio_height = float(height) / image_height
+ ratio = min(ratio_width, ratio_height)
+
+ if ratio_width != ratio:
+ ratio_width = ratio
+ width = int(image_width * ratio)
+ elif ratio_height != ratio:
+ ratio_height = ratio
+ height = int(image_height * ratio)
+
+ return pixbuf.scale_simple(width, height, type)
+
+def from_svg_at_size(filename=None, width=None, height=None, handle=None,
+ keep_ratio=True):
+ """Scale and load SVG into pixbuf"""
+
+ if not handle:
+ handle = rsvg.Handle(filename)
+
+ dimensions = handle.get_dimension_data()
+ icon_width = dimensions[0]
+ icon_height = dimensions[1]
+
+ if icon_width != width or icon_height != height:
+ ratio_width = float(width) / icon_width
+ ratio_height = float(height) / icon_height
+
+ if keep_ratio:
+ ratio = min(ratio_width, ratio_height)
+ if ratio_width != ratio:
+ ratio_width = ratio
+ width = int(icon_width * ratio)
+ elif ratio_height != ratio:
+ ratio_height = ratio
+ height = int(icon_height * ratio)
+ else:
+ ratio_width = 1
+ ratio_height = 1
+
+ surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, width, height)
+ context = cairo.Context(surface)
+ context.scale(ratio_width, ratio_height)
+ handle.render_cairo(context)
+
+ loader = gtk.gdk.pixbuf_loader_new_with_mime_type('image/png')
+ surface.write_to_png(loader)
+ loader.close()
+
+ return loader.get_pixbuf()