public int FetchCount()
{
if (count == -1)
{
count = MuPDF.CountPages(source, password);
}
return(count);
}
private void LoadPdf(IPDFSource source, string password = null)
{
pageBounds = CalcPageBounds(MuPDF.GetPageBounds(source, PageRotation), ViewType);
PageCount = pageBounds.Length;
pdf.Load(source);
}
public IList <IEnumerable <PDFImage> > FetchRange(int startIndex, int count)
{
int perRow = Settings.ImagesPerRow;
ViewType type = Settings.ViewType;
startIndex = (startIndex * perRow) + 1;
count = preFetch ? count * perRow : count;
if (type == ViewType.BOOK)
{
if (startIndex == 1)
{
count = Math.Min(total, preFetch ? (1 + perRow) : 0);
}
else
{
startIndex--;
}
}
int end = Math.Min(FetchCount(), startIndex + count - 1);
List <IEnumerable <PDFImage> > content = new List <IEnumerable <PDFImage> >();
List <PDFImage> rows = new List <PDFImage>(perRow);
int offset = type == ViewType.BOOK ? 1 : 0;
for (int i = Math.Min(FetchCount(), startIndex); i <= Math.Min(FetchCount(), Math.Max(startIndex, end)); i++)
{
Thickness margin = new Thickness(0, 0, Settings.HOffsetPage, 0);
using (Bitmap bitmap = MuPDF.ExtractPage(source, i, Settings.ZoomFactor, password)) {
RotateFlipType flip = Settings.Rotation == ImageRotation.ROTATE_180 ? RotateFlipType.Rotate180FlipNone
: Settings.Rotation == ImageRotation.ROTATE_270 ? RotateFlipType.Rotate270FlipNone
: Settings.Rotation == ImageRotation.ROTATE_90 ? RotateFlipType.Rotate90FlipNone
: RotateFlipType.RotateNoneFlipNone;
bitmap.RotateFlip(flip);
BitmapSource bitmapSource = bitmap.ToBitmapSource();
bitmapSource.Freeze();
margin.Right = (i == 0 && type == ViewType.BOOK) || ((i + offset) % 2 == 0) ? 0 : margin.Right;
PDFImage image = new PDFImage()
{
ImageSource = bitmapSource, Margin = margin
};
if (type == ViewType.BOOK && i == 1)
{
content.Add(new[] { image });
continue;
}
rows.Add(image);
}
if (rows.Count % perRow == 0 || i == end)
{
content.Add(rows);
if (i == end && rows.Count % perRow != 0)
{
PDFImage last = rows.Last();
last.Margin = new Thickness(0);
}
if (i < end)
{
rows = new List <PDFImage>(perRow);
}
}
}
return(content);
}