private void CalcSize(IntPtr currentPage, double dpiX, double dpiY, RectangleF printableArea, bool isLandscape, out double width, out double height, out double x, out double y)
{
x = y = 0;
width = Pdfium.FPDF_GetPageWidth(currentPage) / 72 * dpiX;
height = Pdfium.FPDF_GetPageHeight(currentPage) / 72 * dpiY;
if (_useDP)
{
return;
}
//Calculate the size of the printable area in pixels
var fitSize = new SizeF(
(float)dpiX * printableArea.Width / 100.0f,
(float)dpiY * printableArea.Height / 100.0f
);
var pageSize = new SizeF(
(float)width,
(float)height
);
var rot = Pdfium.FPDFPage_GetRotation(currentPage);
bool isRotated = (rot == PageRotate.Rotate270 || rot == PageRotate.Rotate90) || (width > height);
if (AutoRotate && isRotated)
{
fitSize = new SizeF(fitSize.Height, fitSize.Width);
}
else if (!AutoRotate && isLandscape)
{
fitSize = new SizeF(fitSize.Height, fitSize.Width);
}
switch (PrintSizeMode)
{
case PrintSizeMode.Fit:
var sz = GetRenderSize(pageSize, fitSize);
width = sz.Width;
height = sz.Height;
break;
case PrintSizeMode.CustomScale:
width *= (double)Scale / 100.0;
height *= (double)Scale / 100.0;
break;
case PrintSizeMode.ActualSize:
default:
break;
}
if (AutoCenter)
{
x = (fitSize.Width - width) / 2;
y = (fitSize.Height - height) / 2;
}
}
/// <summary>
/// Raises the System.Drawing.Printing.PrintDocument.QueryPageSettings event. It
/// is called immediately before each System.Drawing.Printing.PrintDocument.PrintPage event.
/// </summary>
/// <param name="e">A System.Drawing.Printing.QueryPageSettingsEventArgs that contains the event data.</param>
protected override void OnQueryPageSettings(QueryPageSettingsEventArgs e)
{
if (AutoRotate)
{
IntPtr currentPage = Pdfium.FPDF_StartLoadPage(_docForPrint, _pageForPrint);
if (currentPage == IntPtr.Zero)
{
e.Cancel = true;
return;
}
double width = Pdfium.FPDF_GetPageWidth(currentPage);
double height = Pdfium.FPDF_GetPageHeight(currentPage);
var rotation = Pdfium.FPDFPage_GetRotation(currentPage);
bool isRotated = (/*rotation == PageRotate.Rotate270 || rotation == PageRotate.Rotate90 ||*/ width > height);
e.PageSettings.Landscape = isRotated;
if (currentPage != IntPtr.Zero)
{
Pdfium.FPDF_ClosePage(currentPage);
}
}
base.OnQueryPageSettings(e);
}
/// <summary>
/// Raises the System.Drawing.Printing.PrintDocument.PrintPage event. It is called
/// before a page prints.
/// </summary>
/// <param name="e"> A System.Drawing.Printing.PrintPageEventArgs that contains the event data.</param>
/// <seealso href="https://pdfium.patagames.com/c-pdf-library/">C# Print PDF</seealso>
protected override void OnPrintPage(PrintPageEventArgs e)
{
base.OnPrintPage(e);
if (_pdfDoc == null)
{
throw new ArgumentNullException("Document");
}
IntPtr hdc = IntPtr.Zero;
IntPtr currentPage = IntPtr.Zero;
try
{
if (e.Cancel)
{
return;
}
currentPage = Pdfium.FPDF_LoadPage(_docForPrint, _pageForPrint);
if (currentPage == IntPtr.Zero)
{
e.Cancel = true;
return;
}
double dpiX = e.Graphics.DpiX;
double dpiY = e.Graphics.DpiY;
double width = Pdfium.FPDF_GetPageWidth(currentPage) / 72 * dpiX;
double height = Pdfium.FPDF_GetPageHeight(currentPage) / 72 * dpiY;
double x, y;
Rectangle clipRect;
CalcSize(dpiX, dpiY, e.PageSettings.PrintableArea, e.MarginBounds, new PointF(e.PageSettings.HardMarginX, e.PageSettings.HardMarginY), e.PageSettings.Landscape, ref width, ref height, out x, out y, out clipRect);
int ix = (int)x;
int iy = (int)y;
int iw = (int)width;
int ih = (int)height;
using (var page = PdfPage.FromHandle(_pdfDoc, currentPage, _pageForPrint, true))
OnBeforeRenderPage(e.Graphics, page, ref ix, ref iy, ref iw, ref ih, PageRotate.Normal);
hdc = e.Graphics.GetHdc();
if (OriginAtMargins)
{
Pdfium.IntersectClipRect(hdc, clipRect.Left, clipRect.Top, clipRect.Right, clipRect.Bottom);
}
Pdfium.FPDF_RenderPage(hdc, currentPage, ix, iy, iw, ih, PageRotate.Normal, RenderFlags);
if (hdc != IntPtr.Zero)
{
e.Graphics.ReleaseHdc(hdc);
}
hdc = IntPtr.Zero;
using (var page = PdfPage.FromHandle(_pdfDoc, currentPage, _pageForPrint, true))
OnAfterRenderPage(e.Graphics, page, ix, iy, iw, ih, PageRotate.Normal);
//Print next page
if (_pageForPrint < PrinterSettings.ToPage - (_useDP ? PrinterSettings.FromPage : 1))
{
_pageForPrint++;
e.HasMorePages = true;
}
}
finally
{
if (hdc != IntPtr.Zero)
{
e.Graphics.ReleaseHdc(hdc);
}
if (currentPage != IntPtr.Zero)
{
Pdfium.FPDF_ClosePage(currentPage);
}
}
}