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# (C) Copyright 2005-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in 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!
""" An image cache. """
import wx
class ImageCache(object):
""" An image cache. """
def __init__(self, width, height):
""" Creates a new image cache. """
self._width = width
self._height = height
# The images in the cache!
self._images = {} # {filename : bitmap}
return
# ------------------------------------------------------------------------
# 'ImageCache' interface.
# ------------------------------------------------------------------------
def get_image(self, filename):
""" Returns the specified image (currently as a bitmap). """
# Try the cache first.
bmp = self._images.get(filename)
if bmp is None:
# Load the image from the file and add it to the list.
#
# N.B 'wx.BITMAP_TYPE_ANY' tells wxPython to attempt to autodetect
# --- the image format.
image = wx.Image(filename, wx.BITMAP_TYPE_ANY)
# We force all images in the cache to be the same size.
self._scale(image)
# We also force them to be bitmaps!
bmp = image.ConvertToBitmap()
# Add the bitmap to the cache!
self._images[filename] = bmp
return bmp
# ------------------------------------------------------------------------
# Private interface.
# ------------------------------------------------------------------------
def _scale(self, image):
""" Scales the specified image (if necessary). """
if (
image.GetWidth() != self._width
or image.GetHeight() != self._height
):
image.Rescale(self._width, self._height)
return image
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