private void ResizeImage()
{
SetProvider();
SetInputData();
// Contains the image bytes
MemoryStream ms = new MemoryStream(1048576);
// Load from provider
if(string.IsNullOrEmpty(page)) {
if(!provider.RetrieveFile(file, ms, false)) {
Response.StatusCode = 404;
Response.Write("File not found.");
return;
}
}
else {
PageInfo info = Pages.FindPage(page);
if(info == null) {
Response.StatusCode = 404;
Response.WriteFile("Page not found.");
return;
}
if(!provider.RetrievePageAttachment(info, file, ms, false)) {
Response.StatusCode = 404;
Response.WriteFile("File not found.");
return;
}
}
// Setup new file name and image format
if(!Page.IsPostBack) {
string ext = Path.GetExtension(file);
txtNewName.Text = Path.GetFileNameWithoutExtension(file) + "-2" + ext;
switch(ext.ToLowerInvariant()) {
case ".jpg":
case ".jpeg":
rdoPng.Checked = false;
rdoJpegHigh.Checked = true;
rdoJpegMedium.Checked = false;
break;
default:
rdoPng.Checked = true;
rdoJpegHigh.Checked = false;
rdoJpegMedium.Checked = false;
break;
}
}
ms.Seek(0, SeekOrigin.Begin);
// Load the source image
System.Drawing.Image source = System.Drawing.Image.FromStream(ms);
lblCurrentSize.Text = string.Format("{0}x{1}", source.Width, source.Height);
if(!Page.IsPostBack) {
txtWidth.Text = source.Width.ToString();
txtHeight.Text = source.Height.ToString();
}
// Put dimension in script
lblDimensions.Text = "<script type=\"text/javascript\"><!--\r\nvar width = " +
source.Width.ToString() +
";\r\nvar height = " + source.Height.ToString() +
";\r\n// -->\r\n</script>";
int resultWidth = source.Width;
int resultHeight = source.Height;
if(rdoPercentage.Checked) {
// Resize by percentage
int dim = 100;
if(string.IsNullOrEmpty(txtPercentage.Text)) dim = 100;
else {
try {
dim = int.Parse(txtPercentage.Text);
}
catch(FormatException) { }
}
// Possible final preview dimensions
resultWidth = source.Width * dim / 100;
resultHeight = source.Height * dim / 100;
}
else {
// Resize by pixel
if(!string.IsNullOrEmpty(txtWidth.Text) && !string.IsNullOrEmpty(txtHeight.Text)) {
try {
resultWidth = int.Parse(txtWidth.Text);
resultHeight = int.Parse(txtHeight.Text);
}
catch(FormatException) { }
}
}
int rotation = GetSelectedRotation();
// Draw preview
if(resultWidth > 290 || resultHeight > 290) {
int previewWidth = resultWidth;
int previewHeight = resultHeight;
// Max preview dimension 290x290
if(resultWidth > resultHeight) {
previewWidth = 290;
previewHeight = (int)((float)290 / (float)resultWidth * (float)resultHeight);
lblScale.Text = string.Format("{0:N0}", (float)290 / (float)resultWidth * 100);
}
else {
previewHeight = 290;
previewWidth = (int)((float)290 / (float)resultHeight * (float)resultWidth);
lblScale.Text = string.Format("{0:N0}", (float)290 / (float)resultHeight * 100);
}
imgPreview.ImageUrl = "Thumb.aspx?File=" + Request["File"] +
@"&Size=imgeditprev&Width=" + previewWidth + @"&Height=" + previewHeight +
@"&Page=" + (string.IsNullOrEmpty(page) ? "" : page) +
(!rdoNoRotation.Checked ? ("&Rot=" + rotation.ToString()) : "");
}
else {
lblScale.Text = "100";
imgPreview.ImageUrl = "Thumb.aspx?File=" + Request["File"] +
@"&Size=imgeditprev&Width=" + resultWidth + @"&Height=" + resultHeight +
@"&Page=" + (string.IsNullOrEmpty(page) ? "" : page) +
(!rdoNoRotation.Checked ? ("&Rot=" + rotation.ToString()) : "");
}
// Destination bitmap
Bitmap result = new Bitmap(
rotation != 90 && rotation != 270 ? resultWidth : resultHeight,
rotation != 90 && rotation != 270 ? resultHeight : resultWidth,
System.Drawing.Imaging.PixelFormat.Format32bppArgb);
// Get Graphics object for destination bitmap
Graphics g = Graphics.FromImage(result);
g.Clear(Color.Transparent);
g.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAlias;
g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBilinear;
g.TranslateTransform(result.Width / 2, result.Height / 2);
g.RotateTransform(rotation);
g.TranslateTransform(-result.Width / 2, -result.Height / 2);
// Draw bitmap
g.DrawImage(source, GetImageRectangle(result.Width, result.Height,
rotation != 90 && rotation != 270 ? source.Width : source.Height,
rotation != 90 && rotation != 270 ? source.Height : source.Width,
rotation == 90 || rotation == 270));
// Prepare encoder parameters
string format = GetCurrentFormat();
resultMemStream = new MemoryStream(1048576);
// Only JPEG and PNG images are editable
if(format == "image/jpeg") {
EncoderParameters encoderParams = new EncoderParameters(1);
encoderParams.Param[0] = new EncoderParameter(Encoder.Quality, rdoJpegHigh.Checked ? 100L : 60L);
result.Save(resultMemStream, GetEncoderInfo(format), encoderParams);
}
else {
result.Save(resultMemStream, ImageFormat.Png);
}
resultMemStream.Seek(0, SeekOrigin.Begin);
// Dispose of source and result bitmaps
source.Dispose();
g.Dispose();
result.Dispose();
}
