/// <summary>
/// Create a new <see cref="MuPDFPage"/> object from the specified document.
/// </summary>
/// <param name="context">The context that owns the document.</param>
/// <param name="document">The document from which the page should be extracted.</param>
/// <param name="number">The number of the page that should be extracted (starting at 0).</param>
internal MuPDFPage(MuPDFContext context, MuPDFDocument document, int number)
{
this.OwnerContext = context;
this.OwnerDocument = document;
this.PageNumber = number;
float x = 0;
float y = 0;
float w = 0;
float h = 0;
ExitCodes result = (ExitCodes)NativeMethods.LoadPage(context.NativeContext, document.NativeDocument, number, ref NativePage, ref x, ref y, ref w, ref h);
this.Bounds = new Rectangle(Math.Round(x * document.ImageXRes / 72.0 * 1000) / 1000, Math.Round(y * document.ImageYRes / 72.0 * 1000) / 1000, Math.Round(w * document.ImageXRes / 72.0 * 1000) / 1000, Math.Round(h * document.ImageYRes / 72.0 * 1000) / 1000);
this.OriginalBounds = new Rectangle(x, y, w, h);
switch (result)
{
case ExitCodes.EXIT_SUCCESS:
break;
case ExitCodes.ERR_CANNOT_LOAD_PAGE:
throw new MuPDFException("Cannot load page", result);
case ExitCodes.ERR_CANNOT_COMPUTE_BOUNDS:
throw new MuPDFException("Cannot compute bounds", result);
default:
throw new MuPDFException("Unknown error", result);
}
}
/// <summary>
/// Render (part of) a page to an array of bytes.
/// </summary>
/// <param name="pageNumber">The number of the page to render (starting at 0).</param>
/// <param name="region">The region of the page to render in page units.</param>
/// <param name="zoom">The scale at which the page will be rendered. This will determine the size in pixel of the image.</param>
/// <param name="pixelFormat">The format of the pixel data.</param>
/// <param name="includeAnnotations">If this is <see langword="true" />, annotations (e.g. signatures) are included in the display list that is generated. Otherwise, only the page contents are included.</param>
/// <returns>A byte array containing the raw values for the pixels of the rendered image.</returns>
public byte[] Render(int pageNumber, Rectangle region, double zoom, PixelFormats pixelFormat, bool includeAnnotations = true)
{
int bufferSize = MuPDFDocument.GetRenderedSize(region, zoom, pixelFormat);
byte[] buffer = new byte[bufferSize];
GCHandle bufferHandle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
IntPtr bufferPointer = bufferHandle.AddrOfPinnedObject();
try
{
Render(pageNumber, region, zoom, pixelFormat, bufferPointer, includeAnnotations);
}
finally
{
bufferHandle.Free();
}
return(buffer);
}
/// <summary>
/// Create a new <see cref="MuPDFPageCollection"/> from the specified document, containing the specified number of pages.
/// </summary>
/// <param name="context">The context that owns the document.</param>
/// <param name="document">The document from which the pages should be extracted.</param>
/// <param name="length">The number of pages in the document.</param>
internal MuPDFPageCollection(MuPDFContext context, MuPDFDocument document, int length)
{
Pages = new MuPDFPage[length];
OwnerContext = context;
OwnerDocument = document;
}
