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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()
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