internal static void OptimisedImageResponse(HttpContext context)
{
var size = GetRequiredSize(context);
if (size.Width == 0 && size.Height == 0)
{
var match = WebProvider.GetMatch(context.Request);
// Get the screen width and height.
int value;
if (match["ScreenPixelsWidth"] != null &&
match["ScreenPixelsWidth"].Count > 0 &&
int.TryParse(match["ScreenPixelsWidth"][0].ToString(), out value))
{
size.Width = value;
}
if (match["ScreenPixelsHeight"] != null &&
match["ScreenPixelsHeight"].Count > 0 &&
int.TryParse(match["ScreenPixelsHeight"][0].ToString(), out value))
{
size.Height = value;
}
// Use the larger of the two values as the width as there is no
// way of knowing if the device is in landscape or portrait
// orientation.
size.Width = Math.Max(size.Width, size.Height);
size.Height = 0;
}
// Ensure the size is not larger than the maximum parameters.
ResolveSize(ref size);
if (size.Width > 0 || size.Height > 0)
{
// Get the files and paths involved in the caching.
var cachedFileVirtualPath = Image.Support.GetCachedResponseFile(context.Request, size);
var cachedFilePhysicalPath = context.Server.MapPath(cachedFileVirtualPath);
var cachedFile = new FileInfo(cachedFilePhysicalPath);
var sourceFile = context.Server.MapPath(context.Request.AppRelativeCurrentExecutionFilePath);
EventLog.Debug(String.Format(
"Image processor is responding with image '{0}' of width '{1}' and height '{2}'",
sourceFile,
size.Width,
size.Height));
// If the cached file doesn't exist or is out of date
// then create a new cached file and serve this in response
// to the request by rewriting the requested URL to the
// static file.
if (cachedFile.Exists == false ||
cachedFile.LastWriteTimeUtc < File.GetLastWriteTimeUtc(sourceFile))
{
// Check the directory exists?
if (cachedFile.Directory.Exists == false)
{
Directory.CreateDirectory(cachedFile.DirectoryName);
}
// Shrink the image to the cache file path. Use a bit depth of 32 pixels
// as the image cache is not aware of the specific devices bit depth, only
// the requested screen size.
var processor = new Image.Processor(32);
var source = new FileInfo(sourceFile);
processor.Width = size.Width;
processor.Height = size.Height;
using (var cachedStream = new MemoryStream())
{
try
{
// Make sure the source stream is closed when the shrinking
// process has been completed.
using (var sourceStream = source.OpenRead())
{
processor.Shrink(
sourceStream,
cachedStream);
}
// Some times the GDI can produce larger files than the original.
// Check for this to ensure the image is smaller.
if (cachedStream.Length < source.Length)
{
// Use the cache stream for the new file.
using (var fileStream = File.Create(cachedFilePhysicalPath))
{
cachedStream.Position = 0;
cachedStream.CopyTo(fileStream);
}
}
else
{
// Copy the original file into the cache to avoid doing
// this again in the future.
source.CopyTo(cachedFilePhysicalPath);
}
}
catch (Exception ex)
{
EventLog.Warn(String.Format(
"Source file '{0}' generated exception '{1}' shrinking to '{2}' by '{3}'.",
sourceFile,
ex,
processor.Width,
processor.Height));
}
}
}
if (File.Exists(cachedFilePhysicalPath))
{
context.RewritePath(cachedFileVirtualPath, true);
}
else
{
context.RewritePath(context.Request.AppRelativeCurrentExecutionFilePath);
}
}
}
internal static void OptimisedImageResponse(HttpContext context)
{
var size = GetRequiredSize(context);
if (size.Width == 0 && size.Height == 0)
{
var match = WebProvider.GetMatch(context.Request);
// Get the screen width and height.
int value;
if (match["ScreenPixelsWidth"] != null &&
match["ScreenPixelsWidth"].Count > 0 &&
int.TryParse(match["ScreenPixelsWidth"][0].ToString(), out value))
size.Width = value;
if (match["ScreenPixelsHeight"] != null &&
match["ScreenPixelsHeight"].Count > 0 &&
int.TryParse(match["ScreenPixelsHeight"][0].ToString(), out value))
size.Height = value;
// Use the larger of the two values as the width as there is no
// way of knowing if the device is in landscape or portrait
// orientation.
size.Width = Math.Max(size.Width, size.Height);
size.Height = 0;
}
// Ensure the size is not larger than the maximum parameters.
ResolveSize(ref size);
if (size.Width > 0 || size.Height > 0)
{
// Get the files and paths involved in the caching.
var cachedFileVirtualPath = Image.Support.GetCachedResponseFile(context.Request, size);
var cachedFilePhysicalPath = context.Server.MapPath(cachedFileVirtualPath);
var cachedFile = new FileInfo(cachedFilePhysicalPath);
var sourceFile = context.Server.MapPath(context.Request.AppRelativeCurrentExecutionFilePath);
EventLog.Debug(String.Format(
"Image processor is responding with image '{0}' of width '{1}' and height '{2}'",
sourceFile,
size.Width,
size.Height));
// If the cached file doesn't exist or is out of date
// then create a new cached file and serve this in response
// to the request by rewriting the requested URL to the
// static file.
if (cachedFile.Exists == false ||
cachedFile.LastWriteTimeUtc < File.GetLastWriteTimeUtc(sourceFile))
{
// Check the directory exists?
if (cachedFile.Directory.Exists == false)
Directory.CreateDirectory(cachedFile.DirectoryName);
// Shrink the image to the cache file path. Use a bit depth of 32 pixels
// as the image cache is not aware of the specific devices bit depth, only
// the requested screen size.
var processor = new Image.Processor(32);
var source = new FileInfo(sourceFile);
processor.Width = size.Width;
processor.Height = size.Height;
using (var cachedStream = new MemoryStream())
{
try
{
// Make sure the source stream is closed when the shrinking
// process has been completed.
using (var sourceStream = source.OpenRead())
{
processor.Shrink(
sourceStream,
cachedStream);
}
// Some times the GDI can produce larger files than the original.
// Check for this to ensure the image is smaller.
if (cachedStream.Length < source.Length)
{
// Use the cache stream for the new file.
using (var fileStream = File.Create(cachedFilePhysicalPath))
{
cachedStream.Position = 0;
cachedStream.CopyTo(fileStream);
}
}
else
{
// Copy the original file into the cache to avoid doing
// this again in the future.
source.CopyTo(cachedFilePhysicalPath);
}
}
catch (Exception ex)
{
EventLog.Warn(String.Format(
"Source file '{0}' generated exception '{1}' shrinking to '{2}' by '{3}'.",
sourceFile,
ex,
processor.Width,
processor.Height));
}
}
}
if (File.Exists(cachedFilePhysicalPath))
context.RewritePath(cachedFileVirtualPath, true);
else
context.RewritePath(context.Request.AppRelativeCurrentExecutionFilePath);
}
}
