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#------------------------------------------------------------------------------
# Copyright (c) 2005, Enthought, Inc.
# 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!
#
# Author: Enthought, Inc.
# Description: <Enthought pyface package component>
#------------------------------------------------------------------------------
""" An image cache. """
# Major package imports.
import wx
class ImageCache:
""" 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 : wx.Image}
# The images in the cache converted to bitmaps.
self._bitmaps = {} # {filename : wx.Bitmap}
return
###########################################################################
# 'ImageCache' interface.
###########################################################################
def get_image(self, filename):
""" Returns the specified image. """
# Try the cache first.
image = self._images.get(filename)
if image 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)
# Add the bitmap to the cache!
self._images[filename] = image
return image
def get_bitmap(self, filename):
""" Returns the specified image as a bitmap. """
# Try the cache first.
bmp = self._bitmaps.get(filename)
if bmp is None:
# Get the image.
image = self.get_image(filename)
# Convert the alpha channel to a mask.
image.ConvertAlphaToMask()
# Convert it to a bitmaps!
bmp = image.ConvertToBitmap()
# Add the bitmap to the cache!
self._bitmaps[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
#### EOF ######################################################################
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