/// <summary>
/// Handles the request for an image.
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
private bool ServeImage(OwinContext context)
{
var handled = false;
var imageRequest = ExtractImageRequest(context);
var result = imageRequest != null;
if (result)
{
Image stockImage = null;
Image tempImage = null;
try {
result = BuildInitialImage(context, imageRequest, ref stockImage, ref tempImage);
if (result)
{
var configuration = _SharedConfiguration.Get();
if (imageRequest.IsHighDpi)
{
tempImage = _Graphics.UseImage(tempImage, _Graphics.ResizeForHiDpi(tempImage ?? stockImage));
}
if (imageRequest.RotateDegrees > 0.0)
{
tempImage = _Graphics.UseImage(tempImage, _Graphics.RotateImage(tempImage ?? stockImage, imageRequest.RotateDegrees.Value));
}
if (imageRequest.Width != null)
{
tempImage = _Graphics.UseImage(tempImage, _Graphics.WidenImage(tempImage ?? stockImage, imageRequest.Width.Value, imageRequest.CentreImageHorizontally));
}
if (imageRequest.ShowAltitudeStalk)
{
tempImage = _Graphics.UseImage(tempImage, _Graphics.AddAltitudeStalk(tempImage ?? stockImage, imageRequest.Height.GetValueOrDefault(), imageRequest.CentreX.GetValueOrDefault()));
}
else if (imageRequest.Height != null)
{
tempImage = _Graphics.UseImage(tempImage, _Graphics.HeightenImage(tempImage ?? stockImage, imageRequest.Height.Value, imageRequest.CentreImageVertically));
}
var addTextLines = imageRequest.HasTextLines && (!context.IsInternet || configuration.InternetClientSettings.CanShowPinText);
if (addTextLines)
{
tempImage = _Graphics.UseImage(tempImage, _Graphics.AddTextLines(tempImage ?? stockImage, imageRequest.TextLines, centreText: true, isHighDpi: imageRequest.IsHighDpi));
}
}
if (result)
{
var image = tempImage ?? stockImage;
if (image != null)
{
using (var stream = new MemoryStream()) {
using (var copy = (Image)image.Clone()) {
copy.Save(stream, imageRequest.ImageFormat);
var bytes = stream.ToArray();
context.ResponseHttpStatusCode = HttpStatusCode.OK;
context.ReturnBytes(
ImageMimeType(imageRequest.ImageFormat),
bytes
);
handled = true;
}
}
}
}
} finally {
if (stockImage != null)
{
stockImage.Dispose(); // clones are now made of all stock images
}
if (tempImage != null)
{
tempImage.Dispose();
}
}
}
return(handled);
}
/// <summary>
/// See base class.
/// </summary>
/// <param name="server"></param>
/// <param name="args"></param>
/// <returns></returns>
protected override bool DoHandleRequest(IWebServer server, RequestReceivedEventArgs args)
{
bool result = false;
if (args.PathAndFile.StartsWith("/Images/", StringComparison.OrdinalIgnoreCase))
{
var imageRequest = ExtractImageRequest(args);
result = imageRequest != null;
// Stock image is an image from the resource file. We don't need to dispose of it, it can be reused
// Temp image is an image we have either built from scratch or built by modifying a stock image. It is only
// good for this request and needs to be disposed of when we're done with it.
Image stockImage = null;
Image tempImage = null;
if (result)
{
try {
result = BuildInitialImage(imageRequest, args, ref stockImage, ref tempImage);
if (result)
{
if (imageRequest.IsHighDpi)
{
tempImage = _Graphics.UseImage(tempImage, _Graphics.ResizeForHiDpi(tempImage ?? stockImage));
}
var addTextLines = imageRequest.HasTextLines && (!args.IsInternetRequest || _InternetClientCanShowText);
if (imageRequest.RotateDegrees > 0.0)
{
tempImage = _Graphics.UseImage(tempImage, _Graphics.RotateImage(tempImage ?? stockImage, imageRequest.RotateDegrees.Value));
}
if (imageRequest.Width != null)
{
tempImage = _Graphics.UseImage(tempImage, _Graphics.WidenImage(tempImage ?? stockImage, imageRequest.Width.Value, imageRequest.CentreImageHorizontally));
}
if (imageRequest.ShowAltitudeStalk)
{
tempImage = _Graphics.UseImage(tempImage, _Graphics.AddAltitudeStalk(tempImage ?? stockImage, imageRequest.Height.GetValueOrDefault(), imageRequest.CentreX.GetValueOrDefault()));
}
else if (imageRequest.Height != null)
{
tempImage = _Graphics.UseImage(tempImage, _Graphics.HeightenImage(tempImage ?? stockImage, imageRequest.Height.Value, imageRequest.CentreImageVertically));
}
if (addTextLines)
{
tempImage = _Graphics.UseImage(tempImage, _Graphics.AddTextLines(tempImage ?? stockImage, imageRequest.TextLines, centreText: true, isHighDpi: imageRequest.IsHighDpi));
}
}
if (result)
{
Responder.SendImage(args.Request, args.Response, tempImage ?? stockImage, imageRequest.ImageFormat);
args.Classification = ContentClassification.Image;
}
} finally {
if (stockImage != null)
{
stockImage.Dispose(); // clones are now made of all stock images
}
if (tempImage != null)
{
tempImage.Dispose();
}
}
}
}
return(result);
}
