/// <summary>
/// Get sprites for image files.
/// </summary>
/// <param name="files">The component images for the sprite.</param>
/// <returns>A list of css sprites</returns>
public virtual List <SpriteElement> ProcessFiles(IEnumerable <ImageFile> files)
{
var spriteElements = new List <SpriteElement>();
foreach (var file in files)
{
var filePath = new Uri(PathProvider.MapPath(file.FilePath)).LocalPath;
var fileInfo = new FileInfo(filePath);
using (var reader = RetryableFileOpener.OpenFileStream(fileInfo, 5, FileMode.Open, FileAccess.Read, FileShare.Read))
{
var spriteElement = new SpriteElement(file.Name, reader);
spriteElements.Add(spriteElement);
}
}
return(spriteElements);
}
/// <summary>
/// Get sprites for image files.
/// </summary>
/// <param name="files">The component images for the sprite.</param>
/// <returns>A list of css sprites</returns>
public virtual List<SpriteElement> ProcessFiles(IEnumerable<ImageFile> files)
{
var spriteElements = new List<SpriteElement>();
foreach (var file in files)
{
var filePath = new Uri(PathProvider.MapPath(file.FilePath)).LocalPath;
var fileInfo = new FileInfo(filePath);
using (var reader = RetryableFileOpener.OpenFileStream(fileInfo, 5, FileMode.Open, FileAccess.Read, FileShare.Read))
{
var spriteElement = new SpriteElement(file.Name, reader);
spriteElements.Add(spriteElement);
}
}
return spriteElements;
}
/// <summary>
/// Combine the images into a sprite image.
/// </summary>
/// <param name="imageOutputPath">Sprite image output path.</param>
/// <param name="spriteImageUrl">Sprite image url.</param>
/// <param name="cssOutputPath">Sprite css output path.</param>
/// <param name="files">The component images for the sprite.</param>
private static void ProcessFiles(string imageOutputPath, string spriteImageUrl, string cssOutputPath, IEnumerable <ImageFile> files)
{
var spriteElements = new List <SpriteElement>();
foreach (var file in files)
{
var fileInfo = new FileInfo(HostingEnvironment.MapPath(file.FilePath));
using (var reader = FileHelper.OpenFileStream(fileInfo, 5, FileMode.Open, FileAccess.Read, FileShare.Read))
{
var spriteElement = new SpriteElement(file.Name, reader);
spriteElements.Add(spriteElement);
}
}
var etag = string.Empty;
using (var image = GetCssSpriteImage(spriteElements))
{
using (var writer = new MemoryStream())
{
image.Save(writer, ImageFormat.Png);
writer.Flush();
etag = HashHelper.CalculateMd5Etag(writer);
var imageFileInfo = new FileInfo(HostingEnvironment.MapPath(imageOutputPath));
//We might be competing with the web server for the output file, so try to overwrite it at regular intervals
using (var outputFile = FileHelper.OpenFileStream(imageFileInfo, 5, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None))
{
var overwrite = true;
if (outputFile.Length > 0)
{
var outputFileHash = HashHelper.CalculateMd5Etag(outputFile);
overwrite = (etag != outputFileHash);
}
if (overwrite)
{
writer.Seek(0, SeekOrigin.Begin);
outputFile.SetLength(writer.Length); //Truncate current file
outputFile.Seek(0, SeekOrigin.Begin);
var bufferSize = Convert.ToInt32(Math.Min(writer.Length, BufferSize));
var buffer = new byte[bufferSize];
int bytesRead;
while ((bytesRead = writer.Read(buffer, 0, bufferSize)) > 0)
{
outputFile.Write(buffer, 0, bytesRead);
}
outputFile.Flush();
}
}
}
}
var cssSpriteImageUrl = string.IsNullOrEmpty(spriteImageUrl) ? VirtualPathUtility.ToAbsolute(imageOutputPath) : spriteImageUrl;
var css = GetCssSpriteCss(spriteElements, etag, cssSpriteImageUrl);
using (var writer = new MemoryStream())
{
var uniEncoding = Encoding.Default;
if (!string.IsNullOrEmpty(css))
{
writer.Write(uniEncoding.GetBytes(css), 0, uniEncoding.GetByteCount(css));
}
var cssFileInfo = new FileInfo(HostingEnvironment.MapPath(cssOutputPath));
using (var outputFile = FileHelper.OpenFileStream(cssFileInfo, 5, FileMode.OpenOrCreate, FileAccess.ReadWrite, FileShare.None))
{
var overwrite = true;
if (outputFile.Length > 0)
{
var newOutputFileHash = HashHelper.CalculateMd5Etag(writer);
var outputFileHash = HashHelper.CalculateMd5Etag(outputFile);
overwrite = (newOutputFileHash != outputFileHash);
}
if (overwrite)
{
writer.Seek(0, SeekOrigin.Begin);
outputFile.SetLength(writer.Length); //Truncate current file
outputFile.Seek(0, SeekOrigin.Begin);
var bufferSize = Convert.ToInt32(Math.Min(writer.Length, BufferSize));
var buffer = new byte[bufferSize];
int bytesRead;
while ((bytesRead = writer.Read(buffer, 0, bufferSize)) > 0)
{
outputFile.Write(buffer, 0, bytesRead);
}
outputFile.Flush();
}
}
}
}
