File: backend_image.py

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#------------------------------------------------------------------------------
# Copyright (c) 2005, Enthought, Inc.
# some parts copyright 2002 by Space Telescope Science Institute
# All rights reserved.
# 
# This software is provided without warranty under the terms of the BSD
# license included in enthought/LICENSE.txt and may be redistributed only
# under the conditions described in the aforementioned license.  The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
# Thanks for using Enthought open source!
#------------------------------------------------------------------------------
""" This backend supports Kiva drawing into memory buffers.  

    Though this can be used to perform drawing in non-GUI applications, 
    the Image backend is also used by many of the GUI backends to draw into 
    the memory space of the graphics contexts.
"""

# Soon the Agg subpackage will be renamed for real.  For now, just
# proxy the imports.
from agg import GraphicsContextArray as GraphicsContext

# FontType will be unified with the Kiva FontType soon.
from agg import AggFontType as FontType

# GraphicsContextSystem wraps up platform- and toolkit- specific low
# level calls with a GraphicsContextArray.  Eventually this low-level code
# will be moved out of the Agg subpackage, and we won't have be importing
# this here.
from agg import GraphicsContextSystem, Image

# CompiledPath is an object that can efficiently store paths to be reused
# multiple times.
from agg import CompiledPath

def font_metrics_provider():
    """ Create an object to be used for querying font metrics.
    """

    return GraphicsContext((1, 1))

# Non-GUI backends don't have Canvases.
Canvas = None
CanvasWindow = None