public static byte[] ResizeImageFile(byte[] imageFile, PhotoSize size)
{
using (System.Drawing.Image original = System.Drawing.Image.FromStream(new MemoryStream(imageFile)))
{
int targetH, targetW;
if (size == PhotoSize.Small || size == PhotoSize.Medium)
{
// regardless of orientation,
// the *height* is constant for thumbnail images (UI constraint)
if (original.Height > original.Width)
{
if (size == PhotoSize.Small)
targetH = DefaultValues.FixedSmallImageHeight;
else
targetH = DefaultValues.FixedMediumImageHeight;
targetW = (int)(original.Width * ((float)targetH / (float)original.Height));
}
else
{
if (size == PhotoSize.Small)
targetW = DefaultValues.FixedSmallImageWidth;
else
targetW = DefaultValues.FixedMediumImageWidth;
targetH = (int)(original.Height * ((float)targetW / (float)original.Width));
}
}
else
{
// for full preview, we scale proportionally according to orienation
if (original.Height > original.Width)
{
targetH = Math.Min(original.Height, DefaultValues.MaxFullImageSize);
targetW = (int)(original.Width * ((float)targetH / (float)original.Height));
}
else
{
targetW = Math.Min(original.Width, DefaultValues.MaxFullImageSize);
targetH = (int)(original.Height * ((float)targetW / (float)original.Width));
}
}
using (System.Drawing.Image imgPhoto = System.Drawing.Image.FromStream(new MemoryStream(imageFile)))
{
// Create a new blank canvas. The resized image will be drawn on this canvas.
using (Bitmap bmPhoto = new Bitmap(targetW, targetH, PixelFormat.Format24bppRgb))
{
bmPhoto.SetResolution(72, 72);
using (Graphics grPhoto = Graphics.FromImage(bmPhoto))
{
grPhoto.SmoothingMode = SmoothingMode.AntiAlias;
grPhoto.InterpolationMode = InterpolationMode.HighQualityBicubic;
grPhoto.PixelOffsetMode = PixelOffsetMode.HighQuality;
grPhoto.DrawImage(imgPhoto, new Rectangle(0, 0, targetW, targetH), 0, 0, original.Width, original.Height, GraphicsUnit.Pixel);
MemoryStream mm = new MemoryStream();
bmPhoto.Save(mm, System.Drawing.Imaging.ImageFormat.Jpeg);
return mm.GetBuffer();
}
}
}
}
}
posted @ 2007-03-16 13:12
Otis 阅读(158)
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