public void EmptyPolicy()
{
var policy = new PagePrefetchAndRetainPolicy();
var key = new PageKey(Guid.Empty, 1, ScreenWidth);
var context = new PageCacheContext(ScreenWidth, GetLibrary(0));
Assert.IsFalse(policy.MustRetain(key, context), "not retain with empty library");
var dict = GetCacheDict(0);
CollectionAssert.IsEmpty(policy.KeysToRemove(dict, context), "no keys exist");
dict = GetCacheDict(5);
CollectionAssert.AreEquivalent(dict.Keys, policy.KeysToRemove(dict, context), "return all keys");
CollectionAssert.IsEmpty(policy.PrefetchKeyOrder(context), "prefetch list empty");
}
protected PageImage CreatePageImage(PageKey key, int pageWidth)
{
if (pageWidth == 0)
{
var layout = GetPageLayout(key.PageNum, key.ScreenWidth);
pageWidth = ((float)key.ScreenWidth / layout.UnitBounds.Width).Round();
}
_lastPageWidth = pageWidth;
Bitmap b = BookProvider.o.RenderPageImage(key.PageNum, new Size(pageWidth, int.MaxValue), RenderQuality.Optimal);
return new PageImage(key, b);
}
public PageImage GetPageImage(int pageNum, int screenWidth)
{
var layout = GetPageLayout(pageNum, screenWidth);
var bmp = BookProvider.o.RenderPageImage(pageNum, new Size(screenWidth, int.MaxValue));
var key = new PageKey(Book.Id, pageNum, screenWidth);
return new PageImage(key, bmp);
}
PageImage GetPageImage(int pageNum, int screenWidth, int pageWidth)
{
// TODO: revise locking
lock (this)
{
PageKey key = new PageKey(Book.Id, pageNum, screenWidth);
PageImage image;
// Try to get from cache
if (ImageCache != null)
{
image = ImageCache.o.Get(key);
if (image != null) { return image; }
}
// Create
image = CreatePageImage(key, pageWidth);
// Save to cache
if (ImageCache != null)
{
image.DisposeOnReturn = false;
ImageCache.o.Add(key, image);
}
return image;
}
}
