// -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-

// Copyright 2012 LibreOffice contributors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef org_libreoffice_touch_XDocumentRenderCallback_idl
#define org_libreoffice_touch_XDocumentRenderCallback_idl

#include <com/sun/star/uno/XInterface.idl>

module org { module libreoffice { module touch {

interface XDocument;

interface XDocumentRenderCallback: com::sun::star::uno::XInterface
{

    // Return false from any of the callbacks if the render result isn't
    // wanted after all and the rendering should stop

    // pageWidth and pageHeight are in [1..squareSide] where squareSide is
    // the side of the render target square implied by the size of the
    // buffer passed to render().

    // This always called at the start of rendering one page

    boolean start( [in] long pageWidth,
                   [in] long pageHeight );

  // Called with unspecified frequency during the rendering, possibly
  // even not at all, but the intent is to call this with "reasonable"
  // frquency if the rendering takes a "long" time. Maybe around ten
  // times a second?

  // There is no guarantee in which order the bitmap is being rendered

  // fraction is in [0..1] and is an approximation of unknown exactness
  // If the rendering code doesn't even bother guessing, it can pass
  // zero all the time. The fraction in subsequent calls never
  // decreases.

  boolean progress( [in] float fraction );

  // There is no callback when the rendering finishes; render() just
  // returns.
};

}; }; };

#endif

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