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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!
""" Enthought pyface package component
"""
import wx
from traits.api import HasTraits, provides
from pyface.i_image_cache import IImageCache, MImageCache
@provides(IImageCache)
class ImageCache(MImageCache, HasTraits):
""" The toolkit specific implementation of an ImageCache. See the
IImageCache interface for the API documentation.
"""
# ------------------------------------------------------------------------
# 'object' interface.
# ------------------------------------------------------------------------
def __init__(self, width, height):
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):
# 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.
if (
image.GetWidth() != self._width
or image.GetHeight() != self._height
):
image.Rescale(self._width, self._height)
# Add the bitmap to the cache!
self._images[filename] = image
return image
def get_bitmap(self, filename):
# 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
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