internal static async Task <PdfPage> Create(
ThreadDispatcher dispatcher,
FpdfDocumentT documentInstance,
int pageIndex)
{
var loadPageResult = await dispatcher.QueueWithResult(() => fpdfview.FPDF_LoadPage(documentInstance, pageIndex));
if (loadPageResult == null)
{
throw new Exception($"Failed to open page for page index {pageIndex}.");
}
var page = new PdfPage(dispatcher, documentInstance, loadPageResult)
{
InitialIndex = pageIndex
};
var getPageSizeResult = await dispatcher.QueueWithResult(() =>
{
var size = new FS_SIZEF_();
var result = fpdfview.FPDF_GetPageSizeByIndexF(documentInstance, pageIndex, size);
return(result == 0 ? null : size);
});
if (getPageSizeResult == null)
{
throw new Exception($"Could not retrieve page size for page index {pageIndex}.");
}
page.Size = new SizeF(getPageSizeResult.Width, getPageSizeResult.Height);
return(page);
}
public async Task <PdfBitmap> Render(
float scale,
Color?backgroundColor,
RenderFlags flags = RenderFlags.RenderAnnotations,
DispatcherPriority priority = DispatcherPriority.Normal,
CancellationToken cancellationToken = default)
{
if (_isDisposed)
{
throw new ObjectDisposedException(nameof(PdfPage));
}
return(await _dispatcher.QueueWithResult(
new RenderPageAction(
_dispatcher,
_pageInstance,
scale,
new RectangleF(0, 0, Size.Width, Size.Height),
flags,
backgroundColor),
priority, cancellationToken));
}