private static void PdfToImages()
{
int dpi = 96;
var watch = new Stopwatch();
watch.Start();
using (var doc = PdfDocument.Load($"{_projectDir}\\Samples\\input.pdf"))
{
int pageCount = doc.Pages.Count;
for (int index = 0; index < pageCount; index++)
{
var page = doc.Pages[index];
int width = (int)(page.Width / 72.0 * dpi);
int height = (int)(page.Height / 72.0 * dpi);
using (var bitmap = new PdfBitmap(width, height, true))
{
bitmap.FillRect(0, 0, width, height, FS_COLOR.White);
page.Render(bitmap, 0, 0, width, height, PageRotate.Normal, RenderFlags.FPDF_LCD_TEXT);
bitmap.Image.Save($"{_projectDir}\\Samples\\outputs\\output_{index}.jpg", ImageFormat.Jpeg);
}
}
watch.Stop();
Console.WriteLine($"Converting {pageCount} pages took {watch.Elapsed.TotalSeconds} seconds");
}
}
public static Bitmap PDFRenderBitmap(PdfPage page, decimal dpiX, decimal dpiY)
{
try
{
int width = (int)(page.Width / 72 * Decimal.ToDouble(dpiX));
int height = (int)(page.Height / 72 * Decimal.ToDouble(dpiY));
using (PdfBitmap pdfBitmap = new PdfBitmap(width, height, true))
{
pdfBitmap.FillRect(0, 0, width, height, Patagames.Pdf.FS_COLOR.White);
page.Render(pdfBitmap, 0, 0, width, height, PageRotate.Normal, RenderFlags.FPDF_PRINTING);
if (pdfBitmap.Image == null)
{
AppLogger.Warn("Failed to get image bitmap from PDFium image object.");
return(null);
}
Bitmap newBitmap = new Bitmap(pdfBitmap.Image);
newBitmap.SetResolution((float)dpiX, (float)dpiY);
return(newBitmap);
}
}
catch (Exception ex)
{
ex.Data.Add("p:pdfPage", page);
throw;
}
}
protected Bitmap RenderArea(int pageIndex,
System.Windows.Point lt,
System.Windows.Point rb)
{
try
{
var page = Document.Pages[pageIndex];
var pageRenderRect = GetRenderRect(pageIndex);
int scaledPageWidth = (int)pageRenderRect.Width;
int scaledPageHeight = (int)pageRenderRect.Height;
Bitmap fullRender;
using (var bmp = new PdfBitmap(scaledPageWidth,
scaledPageHeight,
true))
{
bmp.FillRect(0,
0,
scaledPageWidth,
scaledPageHeight,
new FS_COLOR(PageBackColor.A,
PageBackColor.R,
PageBackColor.G,
PageBackColor.B));
//Render part of page into bitmap;
page.Render(bmp,
0,
0,
scaledPageWidth,
scaledPageHeight,
page.Rotation,
RenderFlags.FPDF_LCD_TEXT);
fullRender = new Bitmap(bmp.Image);
}
var pt1 = page.PageToDeviceEx(0,
0,
scaledPageWidth,
scaledPageHeight,
page.Rotation,
(float)lt.X,
(float)lt.Y);
var pt2 = page.PageToDeviceEx(0,
0,
scaledPageWidth,
scaledPageHeight,
page.Rotation,
(float)rb.X,
(float)rb.Y);
if (pt1.X > pt2.X)
{
int tmpX = pt1.X;
pt1.X = pt2.X;
pt2.X = tmpX;
}
if (pt1.Y > pt2.Y)
{
int tmpY = pt1.Y;
pt1.Y = pt2.Y;
pt2.Y = tmpY;
}
return(fullRender.Clone(
new Rectangle(pt1.X,
pt1.Y,
(int)(pt2.X - pt1.X),
(int)(pt2.Y - pt1.Y)),
fullRender.PixelFormat
));
}
catch (OutOfMemoryException ex)
{
LogTo.Warning(ex, $"Ran out of memory while rendering PDF area: page {pageIndex}, {lt}:{rb}");
return(null);
}
catch (Exception ex)
{
LogTo.Error(ex, $"Failed to render PDF area: page {pageIndex}, {lt}:{rb}");
return(null);
}
}