/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
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 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 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/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include <drawinglayer/tools/converters.hxx>
#include <drawinglayer/geometry/viewinformation2d.hxx>
#include <drawinglayer/processor2d/vclpixelprocessor2d.hxx>
#include <drawinglayer/primitive2d/modifiedcolorprimitive2d.hxx>
#include <basegfx/matrix/b2dhommatrixtools.hxx>
#include <drawinglayer/primitive2d/transformprimitive2d.hxx>
#include <vcl/virdev.hxx>

#ifdef DBG_UTIL
#include <tools/stream.hxx>
#endif

//////////////////////////////////////////////////////////////////////////////

namespace drawinglayer
{
    namespace tools
    {
        BitmapEx DRAWINGLAYER_DLLPUBLIC convertToBitmapEx(
            const drawinglayer::primitive2d::Primitive2DSequence& rSeq,
            const geometry::ViewInformation2D& rViewInformation2D,
            sal_uInt32 nDiscreteWidth,
            sal_uInt32 nDiscreteHeight,
            sal_uInt32 nMaxQuadratPixels)
        {
            BitmapEx aRetval;

            if(rSeq.hasElements() && nDiscreteWidth && nDiscreteHeight)
            {
                // get destination size in pixels
                const MapMode aMapModePixel(MAP_PIXEL);
                const sal_uInt32 nViewVisibleArea(nDiscreteWidth * nDiscreteHeight);
                drawinglayer::primitive2d::Primitive2DSequence aSequence(rSeq);

                if(nViewVisibleArea > nMaxQuadratPixels)
                {
                    // reduce render size
                    double fReduceFactor = sqrt((double)nMaxQuadratPixels / (double)nViewVisibleArea);
                    nDiscreteWidth = basegfx::fround((double)nDiscreteWidth * fReduceFactor);
                    nDiscreteHeight = basegfx::fround((double)nDiscreteHeight * fReduceFactor);

                    const drawinglayer::primitive2d::Primitive2DReference aEmbed(
                        new drawinglayer::primitive2d::TransformPrimitive2D(
                            basegfx::tools::createScaleB2DHomMatrix(fReduceFactor, fReduceFactor),
                            rSeq));

                    aSequence = drawinglayer::primitive2d::Primitive2DSequence(&aEmbed, 1);
                }

                const Point aEmptyPoint;
                const Size aSizePixel(nDiscreteWidth, nDiscreteHeight);
                geometry::ViewInformation2D aViewInformation2D(rViewInformation2D);
                VirtualDevice maContent;

                // prepare vdev
                maContent.SetOutputSizePixel(aSizePixel, false);
                maContent.SetMapMode(aMapModePixel);
                maContent.SetAntialiasing(true);

                // set to all white
                maContent.SetBackground(Wallpaper(Color(COL_WHITE)));
                maContent.Erase();

                // create processor
                processor2d::VclPixelProcessor2D aContentProcessor(aViewInformation2D, maContent);

                // render content
                aContentProcessor.process(aSequence);

                // get content
                maContent.EnableMapMode(false);
                const Bitmap aContent(maContent.GetBitmap(aEmptyPoint, aSizePixel));

                // prepare for mask creation
                maContent.SetMapMode(aMapModePixel);
                maContent.SetAntialiasing(true);

                // set alpha to all white (fully transparent)
                maContent.Erase();

                // embed primitives to paint them black
                const primitive2d::Primitive2DReference xRef(
                    new primitive2d::ModifiedColorPrimitive2D(
                        aSequence,
                        basegfx::BColorModifier(
                            basegfx::BColor(0.0, 0.0, 0.0),
                            0.5,
                            basegfx::BCOLORMODIFYMODE_REPLACE)));
                const primitive2d::Primitive2DSequence xSeq(&xRef, 1);

                // render
                aContentProcessor.process(xSeq);

                // get alpha cahannel from vdev
                maContent.EnableMapMode(false);
                const AlphaMask aAlphaMask(maContent.GetBitmap(aEmptyPoint, aSizePixel));

                // create BitmapEx result
                aRetval = BitmapEx(aContent, aAlphaMask);
            }

#ifdef DBG_UTIL
            static bool bDoSaveForVisualControl(false);
            if(bDoSaveForVisualControl)
            {
                SvFileStream aNew(OUString("c:\\test.png"), STREAM_WRITE|STREAM_TRUNC);
                aNew << aRetval;
            }
#endif

            return aRetval;
        }

    } // end of namespace tools
} // end of namespace drawinglayer

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