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/*
* Created by SharpDevelop.
* User: jeroen
* Date: 3/18/2013
* Time: 10:48 PM
*
* To change this template use Tools | Options | Coding | Edit Standard Headers.
*/
using System;
using System.IO;
namespace BCR
{
public sealed class ImageCache //: GlobalSettings
{
private const string DIRECTORY = "ComicRack BCR";
private static string folder;
private static string cache_folder;
private static string thumbnail_folder;
public int cache_size { get; set; }
// Image conversion settings
// If use_progressive_jpeg is enabled, images are recompressed to progressive jpeg format.
// This is done, because the iPad (IOS 5 and lower) have a limit of 2 megapixels on images in normal jpeg format.
// All normal jpeg images larger than 2 MP are subsampled to abominable quality.
// Subsampling doesn't occur for progressive jpeg and for png file.
// IOS 6 should have a larger limit of 5 MP, which will still be too small for HD comics.
// As the images will be recompressed, some quality loss may occur, but it's way better than subsampling.
public bool use_progressive_jpeg { get; set; }
public int progressive_jpeg_quality { get; set; }
public int progressive_jpeg_size_threshold { get; set; }
// Maximum image dimensions
public int maximum_imagesize { get; set; }
public bool use_max_dimension { get; set; }
public int max_dimension_long { get; set; }
public int max_dimension_short { get; set; }
//private static int max_image_dimension = 3072; // max ipad image size is 4096x3072 ?
private static ImageCache instance = new ImageCache();
public static ImageCache Instance
{
get { return instance; }
}
private ImageCache()
{
cache_size = 1024; // MB
// TODO: make this a user setting?
// Maximum image dimensions for images.
// If you never zoom in, then set this to the size of your tablet screen, e.g. 2048x1536 for ipad 3
use_max_dimension = false;
max_dimension_long = 4096;
max_dimension_short = 3072;
maximum_imagesize = 5*1024*1024; // IOS5 : 5 megapixels
use_progressive_jpeg = true;
progressive_jpeg_size_threshold = 2*1024*1024; // 2 megapixels
progressive_jpeg_quality = 90; // 10..100 %
folder = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), DIRECTORY);
if (!Directory.Exists(folder))
{
Directory.CreateDirectory(folder);
}
cache_folder = folder + "\\cache\\";
if (!Directory.Exists(cache_folder))
{
Directory.CreateDirectory(cache_folder);
}
thumbnail_folder = folder + "\\cache\\thumbnails\\";
if (!Directory.Exists(thumbnail_folder))
{
Directory.CreateDirectory(thumbnail_folder);
}
}
public MemoryStream LoadFromCache(string filename, bool thumbnail)
{
if (cache_size <= 0)
return null;
try
{
byte[] content = File.ReadAllBytes((thumbnail ? thumbnail_folder : cache_folder) + filename);
MemoryStream stream = new MemoryStream(content);
return stream;
}
catch
{
return null;
}
}
public void SaveToCache(string filename, MemoryStream image, bool thumbnail)
{
if (cache_size <= 0)
return;
try
{
CheckCache();
using (FileStream file = new FileStream((thumbnail ? thumbnail_folder : cache_folder) + filename, FileMode.Create, FileAccess.Write))
{
image.WriteTo(file);
}
}
catch//(Exception e)
{
// ignore....
}
}
public void ClearPageCache()
{
DirectoryInfo d = new DirectoryInfo(cache_folder);
FileInfo[] fis = d.GetFiles();
foreach (FileInfo fi in fis)
{
File.Delete(fi.FullName);
}
}
public void ClearThumbnailsCache()
{
DirectoryInfo d = new DirectoryInfo(thumbnail_folder);
FileInfo[] fis = d.GetFiles();
foreach (FileInfo fi in fis)
{
File.Delete(fi.FullName);
}
}
private static int CompareFileDate(FileInfo x, FileInfo y)
{
if (x.CreationTimeUtc == y.CreationTimeUtc)
return 0;
return (x.CreationTimeUtc < y.CreationTimeUtc) ? -1 : 1;
}
public void CheckCache()
{
// If cache is larger than allowed, delete oldest files first
DirectoryInfo d = new DirectoryInfo(cache_folder);
long Size = 0;
// Add file sizes.
FileInfo[] fis = d.GetFiles();
foreach (FileInfo fi in fis)
{
Size += fi.Length;
}
long maxsize = (long)cache_size * 1024*1024;
if (Size > maxsize)
{
Array.Sort(fis, CompareFileDate);
foreach (FileInfo fi in fis)
{
File.Delete(fi.FullName);
Size -= fi.Length;
if (Size < maxsize)
break;
}
}
}
public long GetPageCacheSize()
{
DirectoryInfo d = new DirectoryInfo(cache_folder);
long Size = 0;
// Add file sizes.
FileInfo[] fis = d.GetFiles();
foreach (FileInfo fi in fis)
{
Size += fi.Length;
}
return Size;
}
public long GetThumbnailsCacheSize()
{
DirectoryInfo d = new DirectoryInfo(thumbnail_folder);
long Size = 0;
// Add file sizes.
FileInfo[] fis = d.GetFiles();
foreach (FileInfo fi in fis)
{
Size += fi.Length;
}
return Size;
}
}
}
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