} // proc Render
/// <summary>Render the whole page to an bitmap.</summary>
/// <param name="width">Width of the result bitmap.</param>
/// <param name="height">Height of the result bitmap</param>
/// <param name="keepAspect">Should the page keep is aspect.</param>
/// <param name="flags">Render flags</param>
/// <returns>Bitmap of the page.</returns>
public ImageSource Render(int width, int height, bool keepAspect = true, PdfPageRenderFlag flags = PdfPageRenderFlag.None)
{
if (keepAspect)
{
var aspect = Width / Height;
if (width > height) // calc height
{
height = (int)(width / aspect);
}
else
{
width = (int)(height * aspect);
}
}
if (width <= 0)
{
throw new ArgumentOutOfRangeException(nameof(width), width, "Must be positiv.");
}
if (height <= 0)
{
throw new ArgumentOutOfRangeException(nameof(height), height, "Must be positiv.");
}
// create target bitmap
lock (FPDF_LibraryLock)
{
var hBitmap = CreatePdfBitmap(width, height);
try
{
// render page
lock (FPDF_LibraryLock)
FPDF_RenderPageBitmap(hBitmap, pageHandle.DangerousGetHandle(), 0, 0, width, height, 0, (int)flags);
// copy bitmap
return(CreateImageSource(hBitmap, width, height));
}
finally
{
FPDFBitmap_Destroy(hBitmap);
}
}
} // proc Render
} // proc Render
/// <summary>Render the page to an device context (e.g. for printing)</summary>
/// <param name="hdc">GDI+ device context.</param>
/// <param name="x">x-offset in the device context.</param>
/// <param name="y">y-offset in the device context.</param>
/// <param name="w">width in the device context.</param>
/// <param name="h">height in the device context.</param>
/// <param name="r">rotation of the page (0,90,180,270 are possible).</param>
/// <param name="flags">Render flags</param>
public void Render(IntPtr hdc, int x, int y, int w, int h, int r = 0, PdfPageRenderFlag flags = PdfPageRenderFlag.None)
{
lock (FPDF_LibraryLock)
FPDF_RenderPage(hdc, pageHandle.DangerousGetHandle(), x, y, w, h, (r / 90) % 4, (int)flags);
} // proc Render
} // func CreateImageSource
/// <summary>Renders a Part of a Page</summary>
/// <param name="pageClipping">Clipping area of the page in pixels.</param>
/// <param name="scaleX">Scale factor from page units to pixels.</param>
/// <param name="scaleY">Scale factor from page units to pixels.</param>
/// <param name="rotation">Rotation of the page (only 0,90,180,270 are usefull)</param>
/// <param name="flags">Render flags</param>
/// <returns></returns>
public ImageSource Render(Rect pageClipping, double scaleX, double scaleY, double rotation = 0, PdfPageRenderFlag flags = PdfPageRenderFlag.None)
{
lock (FPDF_LibraryLock)
{ // create target bitmap
var width = (int)pageClipping.Width;
var height = (int)pageClipping.Height;
var hBitmap = CreatePdfBitmap(width, height);
try
{
var clipping = default(FS_RECTF);
var matrix = default(FS_MATRIX);
clipping.left = 0.0f;
clipping.top = 0.0f;
clipping.right = (float)pageClipping.Width;
clipping.bottom = (float)pageClipping.Height;
var m = new Matrix(1.0, 0.0, 0.0, 1.0, 0.0, 0.0);
if (rotation != 0)
{
m.RotateAt(rotation, Width / 2, Height / 2);
}
m.Scale(scaleX, scaleY);
m.Translate(-(float)pageClipping.X, -(float)pageClipping.Y);
matrix.a = (float)m.M11;
matrix.b = (float)m.M12;
matrix.c = (float)m.M21;
matrix.d = (float)m.M22;
matrix.e = (float)m.OffsetX;
matrix.f = (float)m.OffsetY;
FPDF_RenderPageBitmapWithMatrix(hBitmap, pageHandle.DangerousGetHandle(), ref matrix, ref clipping, (int)flags);
return(CreateImageSource(hBitmap, width, height));
}
finally
{
FPDFBitmap_Destroy(hBitmap);
}
}
} // proc Render
