/// <inheritdoc />
public byte[] GetImage()
{
lock (DocLib.Lock)
{
var width = GetPageWidth();
var height = GetPageHeight();
var bitmap = fpdf_view.FPDFBitmapCreate(width, height, 1);
if (bitmap == null)
{
throw new DocnetException("failed to create a bitmap object");
}
var stride = fpdf_view.FPDFBitmapGetStride(bitmap);
var result = new byte[stride * height];
try
{
// | | a b 0 |
// | matrix = | c d 0 |
// | | e f 1 |
using (var matrix = new FS_MATRIX_())
using (var clipping = new FS_RECTF_())
{
matrix.A = (float)_scaling;
matrix.B = 0;
matrix.C = 0;
matrix.D = (float)_scaling;
matrix.E = 0;
matrix.F = 0;
clipping.Left = 0;
clipping.Right = width;
clipping.Bottom = 0;
clipping.Top = height;
fpdf_view.FPDF_RenderPageBitmapWithMatrix(bitmap, _page, matrix, clipping, 0);
var buffer = fpdf_view.FPDFBitmapGetBuffer(bitmap);
Marshal.Copy(buffer, result, 0, result.Length);
}
}
catch (Exception ex)
{
throw new DocnetException("error rendering page", ex);
}
finally
{
fpdf_view.FPDFBitmapDestroy(bitmap);
}
return(result);
}
}
protected override unsafe PdfBitmap OnExecute(CancellationToken cancellationToken)
{
try
{
cancellationToken.ThrowIfCancellationRequested();
_bitmap = fpdfview.FPDFBitmapCreateEx(
(int)_viewport.Size.Width,
(int)_viewport.Size.Height,
(int)FPDFBitmapFormat.BGRA,
IntPtr.Zero,
0);
if (_bitmap == null)
{
throw new Exception("failed to create a bitmap object");
}
cancellationToken.ThrowIfCancellationRequested();
if (_backgroundColor.HasValue)
{
fpdfview.FPDFBitmapFillRect(
_bitmap,
0,
0,
(int)_viewport.Size.Width,
(int)_viewport.Size.Height,
_backgroundColor.Value.ToPixel <Argb32>().Argb);
cancellationToken.ThrowIfCancellationRequested();
}
using var clipping = new FS_RECTF_
{
Left = 0,
Right = _viewport.Size.Width,
Bottom = 0,
Top = _viewport.Size.Height
};
// | | a b 0 |
// | matrix = | c d 0 |
// | | e f 1 |
using var matrix = new FS_MATRIX_
{
A = _scale,
B = 0,
C = 0,
D = _scale,
E = -_viewport.X,
F = -_viewport.Y
};
fpdfview.FPDF_RenderPageBitmapWithMatrix(_bitmap, _pageInstance, matrix, clipping, (int)_flags);
cancellationToken.ThrowIfCancellationRequested();
var scan0 = fpdfview.FPDFBitmapGetBuffer(_bitmap);
var image = Image.WrapMemory <Bgra32>(
scan0.ToPointer(),
(int)_viewport.Size.Width,
(int)_viewport.Size.Height);
return(new PdfBitmap(_bitmap, image, _dispatcher, _scale, _viewport));
}
catch (OperationCanceledException)
{
if (_bitmap != null)
{
fpdfview.FPDFBitmapDestroy(_bitmap);
}
throw;
}
catch (Exception ex)
{
if (_bitmap != null)
{
fpdfview.FPDFBitmapDestroy(_bitmap);
}
throw new Exception("Error rendering page. Check inner exception.", ex);
}
}
