private static LEADDocument AddDocumentToCache(LEADDocument largestDocument, IOcrEngine ocrEngine, Uri documentUri, LoadDocumentOptions loadOptions, DocumentCacheOptions cacheOptions)
{
// Adds the document to the cache. Note that a new cache entry is created for each different maximumImagePixelSize.
var document = DocumentFactory.LoadFromUri(documentUri, loadOptions);
try
{
if (document == null)
{
throw new InvalidOperationException("Failed to load URI: " + documentUri);
}
// We will modify this document...
bool wasReadOnly = document.IsReadOnly;
document.IsReadOnly = false;
if (document.Text.TextExtractionMode != DocumentTextExtractionMode.OcrOnly && !document.Images.IsSvgSupported && ocrEngine != null)
{
document.Text.OcrEngine = ocrEngine;
}
// Set in the cache options that we want
document.CacheOptions = cacheOptions;
// prepare the document, caching as much as possible.
if (document.IsStructureSupported && !document.Structure.IsParsed)
{
document.Structure.Parse();
}
// Need to cache the SVG with and without getting the back image
var loadSvgOptions = new CodecsLoadSvgOptions();
foreach (var page in document.Pages)
{
// If we have a previous largest document, use the same
// SVG and text instead of recreating them (they do not change based on image size)
DocumentPage largestDocumentPage = null;
if (largestDocument != null)
{
largestDocumentPage = largestDocument.Pages[page.PageNumber - 1];
}
if (cacheOptions == DocumentCacheOptions.None)
{
// We are done, do not cache the images, svg or text
continue;
}
if ((cacheOptions & DocumentCacheOptions.PageSvg) == DocumentCacheOptions.PageSvg)
{
// SVG, this does not depend on the image size
using (var svg = page.GetSvg(null))
{
}
using (var svg = page.GetSvg(loadSvgOptions))
{
}
}
if ((cacheOptions & DocumentCacheOptions.PageSvgBackImage) == DocumentCacheOptions.PageSvgBackImage)
{
// SVG back image, this is different based on the image size
using (var svgBack = page.GetSvgBackImage(RasterColor.FromKnownColor(RasterKnownColor.White)))
{
}
}
if ((cacheOptions & DocumentCacheOptions.PageImage) == DocumentCacheOptions.PageImage)
{
// Image, this is different based on the image size
using (var image = page.GetImage())
{
}
}
if ((cacheOptions & DocumentCacheOptions.PageThumbnailImage) == DocumentCacheOptions.PageThumbnailImage)
{
// Thumbnail, this does not depend on the image size but there is no set thumbnail method
using (var thumbnailImage = page.GetThumbnailImage())
{
}
}
if ((cacheOptions & DocumentCacheOptions.PageText) == DocumentCacheOptions.PageText)
{
// Text, this does not depend on the image size
if (largestDocumentPage == null)
{
page.GetText();
}
else
{
var pageText = largestDocumentPage.GetText();
page.SetText(pageText);
}
}
}
document.AutoDeleteFromCache = false;
document.AutoDisposeDocuments = true;
document.AutoSaveToCache = false;
// Stop caching
document.CacheOptions = DocumentCacheOptions.None;
document.IsReadOnly = wasReadOnly;
// save it to the regular cache
document.SaveToCache();
return(document);
}
catch (Exception)
{
if (document != null)
{
document.Dispose();
}
throw;
}
}