public static Stream CompressImage(Image original, ImageCrompressOpts o)
{
Stream compressedStream = new MemoryStream();
//-- Get first codec match for image format
ImageCodecInfo encoder = GetEncoder(o.Format);
EncoderParameters encoderParams = new EncoderParameters(1);
encoderParams.Param[0] = new EncoderParameter(Encoder.Quality, o.CompressionWeight);
new Bitmap(original).Save(compressedStream, encoder, encoderParams);
return(compressedStream);
}
/// <summary>
///
/// </summary>
/// <param name="stream"></param>
/// <param name="destFilePath"></param>
/// <param name="destFileName"></param>
/// <param name="cropOptions"></param>
/// <param name="resizeOptions"></param>
/// <param name="compressOptions"></param>
public void ProcessAndSaveImageFromStream(Stream stream, string destFilePath, string destFileName,
ImageCropOpts cropOptions, ImageResizeOpts resizeOptions, ImageCrompressOpts compressOptions, ImageCropOpts maxDimensionsAftersize)
{
stream.Seek(0, SeekOrigin.Begin);
using (var image = Image.FromStream(stream))
{
//-- Set the processed image to the original image incase we don't apply any cropping or resizing we'll save the image as is.
Image processedImg = image;
if (cropOptions != null)
{
processedImg = ImageCropper.Crop(processedImg, cropOptions);
}
if (resizeOptions != null)
{
processedImg = ImageResizer.ResizeImage(processedImg, resizeOptions);
}
//-- Clip the width or height if it's still too large after resized
if (maxDimensionsAftersize != null)
{
if ((maxDimensionsAftersize.W != 0) && (processedImg.Width > maxDimensionsAftersize.W))
{
var widthCropOptions = new ImageCropOpts(0, 0, maxDimensionsAftersize.W, processedImg.Height);
processedImg = ImageCropper.Crop(processedImg, widthCropOptions);
}
if ((maxDimensionsAftersize.H != 0) && (processedImg.Height > maxDimensionsAftersize.H))
{
var heightCropOptions = new ImageCropOpts(0, 0, processedImg.Width, maxDimensionsAftersize.H);
processedImg = ImageCropper.Crop(processedImg, heightCropOptions);
}
}
//-- TODO: think about putting in a max dimensions crop, where if an image is resized by exact width or height, we clip
//-- the corresponding height or width
//if (maxDimensionsAftersize != null) { }
using (var compressedImgStream = ImageCompressor.CompressImage(processedImg, compressOptions))
{
//-- If there's been no cropping or resizing & the original image size is small enough
//-- then we're going to save the original stream to avoid image quality degradation
if (processedImg.Height == image.Height && processedImg.Width == processedImg.Width)
{
bool originalImageSizeUnderThreshold = (stream.Length < compressOptions.OriginalByteLengthThreshold);
//-- If it's under the threshold then we just use the original image would compounding the compression
if (originalImageSizeUnderThreshold)
{
stream.CopyTo(compressedImgStream); //http://stackoverflow.com/questions/230128/best-way-to-copy-between-two-stream-instances-c-sharp
stream.Position = compressedImgStream.Position = 0;
ImagePersister.SaveImage(compressedImgStream, destFilePath, destFileName);
return;
}
}
ImagePersister.SaveImage(compressedImgStream, destFilePath, destFileName);
}
}
}
/// <summary>
/// Take an existing image somewhere on the internet and save it using the destination path/name, crop and resize options.
/// </summary>
/// <param name="originalImgUrl"></param>
/// <param name="destFilePath"></param>
/// <param name="destFileName"></param>
/// <param name="cropOptions"></param>
/// <param name="resizeOptions"></param>
/// <remarks>
/// This method is useful when saving images from "web" (external sites). It is also useful during the upload / cropping process
/// </remarks>
public void ProcessAndSaveImageFromWebUrl(string originalImgUrl, string destFilePath, string destFileName,
ImageCropOpts cropOptions, ImageResizeOpts resizeOptions, ImageCrompressOpts compressOptions)
{
using (Stream imageStream = new ImageDownloader().DownloadImageAsStream(originalImgUrl))
{
ProcessAndSaveImageFromStream(imageStream, destFilePath, destFileName, cropOptions, resizeOptions, compressOptions, null);
}
}
/// <summary>
/// Save a thumbnail of an image with x/y dimensions specified by thumbW & thumbH
/// </summary>
/// <param name="stream"></param>
/// <param name="destFilePath"></param>
/// <param name="destFileName"></param>
/// <param name="thumbW"></param>
/// <param name="thumbH"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <param name="compressOptions"></param>
private void SaveThumbImageWithResizeThenCrop(Stream stream, string destFilePath, string destFileName, int thumbW, int thumbH,
ImageCropOpts cropOpts, ImageCrompressOpts compressOptions)
{
var thumbPixelBuffer = 0;
ImageResizeOpts resizeOpts = new ImageResizeOpts()
{
Mode = ResizeMode.ShrinkOnly, Height = thumbW + thumbPixelBuffer, Width = thumbH + thumbPixelBuffer
};
stream.Seek(0, SeekOrigin.Begin);
using (var image = Image.FromStream(stream))
{
//-- Set the processed image to the original image incase we don't apply any cropping or resizing we'll save the image as is.
Image processedImg = image;
//-- Do the initial crop
if (cropOpts != null)
{
processedImg = ImageCropper.Crop(image, cropOpts);
}
//-- If our cropped image dimensions are bigger than the Thumb buffer dimensions
if (processedImg.Width > resizeOpts.Width && processedImg.Height > resizeOpts.Height)
{
processedImg = ImageResizer.ResizeImage(processedImg, resizeOpts);
}
//-- In case the image width is smaller than the desired thumb width, we enlarge it
if (processedImg.Width < thumbW)
{
//-- If the image is smaller we first enlarge the image based of width, if the height is still to small we enlarge it again
var enlargeWidthOptions = new ImageResizeOpts()
{
Mode = ResizeMode.ExactWidth, Height = 0, Width = thumbH
};
//-- First try the width
processedImg = ImageResizer.ResizeImage(processedImg, enlargeWidthOptions);
}
//-- In case the image height is smaller than the desired Thumb height, we enlarge it
if (processedImg.Height < thumbH)
{
ImageResizeOpts enlargeHeightOptions = new ImageResizeOpts()
{
Mode = ResizeMode.ExactHeight, Height = thumbW, Width = 0
};
processedImg = ImageResizer.ResizeImage(processedImg, enlargeHeightOptions);
}
//-- If needed, crop the width to be exact
if (processedImg.Width > thumbW)
{
var widthCropOptions = new ImageCropOpts(0, 0, thumbW, processedImg.Height);
processedImg = ImageCropper.Crop(processedImg, widthCropOptions);
}
//-- If needed, crop the height to be exact
if (processedImg.Height > thumbH)
{
var heightCropOptions = new ImageCropOpts(0, 0, processedImg.Width, thumbH);
processedImg = ImageCropper.Crop(processedImg, heightCropOptions);
}
//-- Save the thumb compressed heavily
using (var compressedImage = ImageCompressor.CompressImage(processedImg, compressOptions))
{
ImagePersister.SaveImage(compressedImage, destFilePath, destFileName);
}
}
}
/// <summary>
///
/// </summary>
/// <param name="stream"></param>
/// <param name="destFilePath"></param>
/// <param name="destFileName"></param>
/// <remarks>
/// Used for media thumbs
/// </remarks>
public void SaveThumb75x75_MediumCompressed(Stream stream, string destFilePath, string destFileName)
{
var compressOptions = new ImageCrompressOpts(45, ImageConstants.Kb05);
SaveThumbImageWithResizeThenCrop(stream, destFilePath, destFileName, 75, 75, null, compressOptions);
}
/// <summary>
///
/// </summary>
/// <param name="stream"></param>
/// <param name="destFilePath"></param>
/// <param name="destFileName"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <remarks>
/// Used for profile Avatar thumbs
/// </remarks>
public void SaveThumb40x40_HighCompressed(Stream stream, string destFilePath, string destFileName, ImageCropOpts cropOpts)
{
var compressOptions = new ImageCrompressOpts(90, ImageConstants.Kb05);
SaveThumbImageWithResizeThenCrop(stream, destFilePath, destFileName, 40, 40, cropOpts, compressOptions);
}