v2.8 May 27, 2011 (Upgrade notes from V2.6 to v2.8)

• Fixed serious limitation of ImageResizerMaxWidth/Height settings.
  These settings only control the size of the photo portion of the image. They do not limit the dimensions of the resulting bitmap.

  New behavior: When the final dimensions of an image would exceed 2x the configured max width and height, the request will be ignored with the following message: "The specified image will be more than 2x the permitted size. Request terminated."

• Fixed bug: Mime-type: image/x-png was being sent instead of image/png. Causes Chrome to download images instead of displaying them.
• Fixed bug in disk caching system: Cached files modified by just one day or one hour don't get updated.
• Fixed bug where specifying both width and maxheight would cause width to be ignored.
• Fixed bug: Two simultaneous ImageManager.getBestInstance() calls at app startup could return two different instances.
• Fixed bug causing Dictionary exception on the first request after the app was restarted. Only occurred if two simultaneous requests occurred. Only would happen once per app lifetime.
• Fixed potential bug: Extremely rare Access Denied message occurring on one of 2 simultaneous requests for a newly added source image. No reported occurrences.
• Removed System.Data and System.Xml dependencies.

• Fixed bug where a NullReference exception would occur if the Authentication module didn't process the request. All requests appear anonymous now in that situation.
• Fixed rounding bug and added regression test. New behavior is to round ALL values before performing drawing, but AFTER math is done. Was previously trimming a line of pixels off certain images.
• Fixed border bug where border was drawn over top of padding.
• Fixed threading bug with creating the web.config file. Two concurrent requests would cause an exception.
• Fixed bug where no URL Authorization was occurring UNLESS DisableImageURLAuthorization=TRUE in web.config (This bug did not exist in v2.1b, only in custom versions sent to customers between Mar. 19 and Nov. 11)
• Fixed SecurityException errors occurring on GoDaddy and in other low-trust environments: changed the Animation plugin to use static methods instead of reflection. Users of the animation plugin, contact me for an updated version.
• Added support for splitting the image cache into subfolders, allowing scalability to millions of images:
• Set "ImageCacheSubfolders" to the number of required folders.
• Added support for resizing images from VirtualPathProviders. Set either ImageResizerUseVirtualPathProvider or ImageResizerUseVirtualPathProviderAsFallback to true to enable the functionality. In Fallback mode, the virtual path provider is only called if no physical file exists.
• Added support for implementing cache-friendly database-driven image resizing using a VirtualPathProvider.
• Added IVirtualFileWithModified and IVirtualBitmapFile. Allow custom virtual path providers to be cache-friendly and even send bitmaps directly to the image resizer. Great for implementing new image formats.
• Added &scale=UpscaleCanvas mode. Instead of upscaling the image, the canvas expands to the specified Width and Height.
• Added DisableImageURLAuthorization setting. Set to TRUE to disable additional URL authorization checking within the resizer (imagecache is still protected).
• Added BuildImage overloads with VirtualFile support
• Added static event hooks for URL rewriting on images (replaces CustomFolders.cs, although CustomFolders.cs still works).
• CustomFolders.cs will be removed in the next major revision.
• Added the ability to specify custom extension/ImageFormat mappings, in case your jpegs are named .cow or .pig for some strange reason.
• Added TranslatePoint methods to allow simulation of a resize (useful for image map generation).
• Added Size GetFinalSize() methods to ImageManager.cs for determining the resulting size of an image.
• Performance boost: modified DiskUtil.UpdateCachedVersionIfNeeded to use 'cachedFile' instead of 'sourceFile' as lock/sync key.

• Fixed: Fixed elusive performance bug in DiskCache that caused directory listings to run every image request.
• Added: GIF/PNG dithering support!
• Added: Zero-IIS-configuration installation mode! No wildcard mapping needed. Syntax: "image.jpg.axd?width=500"
• Fixed: All requests are forced to pass through the UrlAuthorizationModule now. Previously, any URL rewriting (like customfolders.cs) caused URL auth rules to be circumvented. This was documented behavior, but a secure solution has now been found.
• Added: DisableCustomQuantization setting to allow GIFs to be generated on servers where the Marshal class is prohibited.
• Added: PerfTests project to run benchmarks on the image resizing and encoding code.
• Added: ImageManager.BuildImage now accepts an HttpPostedFile instance for resizing, making upload and resize simple. Sample project included.

• Fixed: Extremely rare bug where rounding causes Bitmap to be initialized with a dimension of 0, and causes a Parameter exception. Occurred when resizing an image to < 2px in height or width (usually happens with 2x1000 size images, etc). Added regression test for 500x2 image resized to 100px wide.
• Fixed: Typo (missing else) in SaveToNonSeekableStream. This method is for extensibility, and is not used by the Resizer directly. This method is now tested and part of the Regression tests (HandlerTest.ashx).

• Fixed: Transparency is preserved more reliably with GIF files. Certain GIF files were losing transparency because the way the color palette was constructed.
• Fixed: .tif is now a supported input extension… previously only .tiff and .tff were allowed.
• Added WatermarkSettings.cs class for watermarking. Easy to extend for your own use.
• Converted ImageManager from a Static class to a normal class with a getBestInstance() static method. Allows easy plugin creation for ImageManager.
• Added support for ?frame=1-x and ?page=1-x. You can now select frames from GIF images and pages from TIFF files. Removed ?time
• Hashes are now SHA-256 instead of .NET 32-bit. They are base-16 encoded. This results in longer file names, but astronomically low chances of hash collisions.
• Fixed upgrade notes link in upgrade notes.txt

• Fixed: Incorrect aspect ratio issue if both maxwidth, width, and height are specified.<
• Fixed: UNC hosted websites are now supported.
• Added DisableCacheCleanup command, and made MaxCachedImages < 0 behave the same as DisableCacheCleanup=true
• Fixed: rounding error that could cause a pixel line on the right and/or bottom sides of the image. Rare floating point rounding error in GDI native code. Added code to force rounding to be consistent.

• Fixed: Cleanup routine can cause bottleneck on GetFiles() - fix so that Directory.GetFiles() only happens at startup and when items are added. Only affects sites with slow filesystems (or without filesystem caching), and with thousands of images.
• Fixed: imagecache/ is not protected when AllowURLRewriting is enabled http://localhost/resize(40,40)/imagecache/1639776677.jpg bypasses it. Added protection in the HttpModule.
• Fixed: Potential issue in Quantizer.cs that may cause lines in GIF output.
• Fixed Maxwidth/maxheight not getting picked up.
• Fixed: Custom crop coordinates at 0 were being applied in the negative coordinate zone. Fixed so x1,y1 weren't affected, but setting x2 and y2 to 0 is bottom-right relative.
• Changed flip to be after all operations, and added sourceFlip to replace its behavior.
• Added -ignoreicc parameter and made ICC reading the default. ICC profiles are not written out - browser does not support them.