/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * 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 <tools/poly.hxx>

#include <vcl/salbtype.hxx>
#include <vcl/bitmap.hxx>
#include <vcl/region.hxx>
#include <vcl/bitmapaccess.hxx>

#include <bmpfast.hxx>

void BitmapWriteAccess::SetLineColor( const Color& rColor )
{
    if (rColor.GetTransparency() == 255)
    {
        mpLineColor.reset();
    }
    else
    {
        if (HasPalette())
        {
            mpLineColor.reset(new BitmapColor(static_cast<sal_uInt8>(GetBestPaletteIndex(rColor))));
        }
        else
        {
            mpLineColor.reset(new BitmapColor(rColor));
        }
    }
}

void BitmapWriteAccess::SetFillColor()
{
    mpFillColor.reset();
}

void BitmapWriteAccess::SetFillColor( const Color& rColor )
{
    if (rColor.GetTransparency() == 255)
    {
        mpFillColor.reset();
    }
    else
    {
        if (HasPalette())
        {
            mpFillColor.reset(new BitmapColor(static_cast<sal_uInt8>(GetBestPaletteIndex(rColor))));
        }
        else
        {
            mpFillColor.reset(new BitmapColor(rColor));
        }
    }
}

void BitmapWriteAccess::Erase( const Color& rColor )
{
    // convert the color format from RGB to palette index if needed
    // TODO: provide and use Erase( BitmapColor& method)
    BitmapColor aColor = rColor;
    if (HasPalette())
    {
        aColor = BitmapColor(static_cast<sal_uInt8>(GetBestPaletteIndex(rColor)));
    }
    // try fast bitmap method first
    if (ImplFastEraseBitmap(*mpBuffer, aColor))
        return;

    // use the canonical method to clear the bitmap
    BitmapColor* pOldFillColor = mpFillColor ? new BitmapColor(*mpFillColor) : nullptr;
    const Point aPoint;
    const Rectangle aRect(aPoint, maBitmap.GetSizePixel());

    SetFillColor(rColor);
    FillRect(aRect);

    mpFillColor.reset(pOldFillColor);
}

void BitmapWriteAccess::DrawLine( const Point& rStart, const Point& rEnd )
{
    if (mpLineColor)
    {
        const BitmapColor& rLineColor = *mpLineColor.get();
        long nX, nY;

        if (rStart.X() == rEnd.X())
        {
            // Vertical Line
            const long nEndY = rEnd.Y();

            nX = rStart.X();
            nY = rStart.Y();

            if (nEndY > nY)
            {
                for (; nY <= nEndY; nY++ )
                    SetPixel( nY, nX, rLineColor );
            }
            else
            {
                for (; nY >= nEndY; nY-- )
                    SetPixel( nY, nX, rLineColor );
            }
        }
        else if (rStart.Y() == rEnd.Y())
        {
            // Horizontal Line
            const long nEndX = rEnd.X();

            nX = rStart.X();
            nY = rStart.Y();

            if (nEndX > nX)
            {
                for (; nX <= nEndX; nX++)
                    SetPixel(nY, nX, rLineColor);
            }
            else
            {
                for (; nX >= nEndX; nX--)
                    SetPixel(nY, nX, rLineColor);
            }
        }
        else
        {
            const long  nDX = labs( rEnd.X() - rStart.X() );
            const long  nDY = labs( rEnd.Y() - rStart.Y() );
            long nX1;
            long nY1;
            long nX2;
            long nY2;

            if (nDX >= nDY)
            {
                if (rStart.X() < rEnd.X())
                {
                    nX1 = rStart.X();
                    nY1 = rStart.Y();
                    nX2 = rEnd.X();
                    nY2 = rEnd.Y();
                }
                else
                {
                    nX1 = rEnd.X();
                    nY1 = rEnd.Y();
                    nX2 = rStart.X();
                    nY2 = rStart.Y();
                }

                const long nDYX = (nDY - nDX) << 1;
                const long nDY2 = nDY << 1;
                long nD = nDY2 - nDX;
                bool bPos = nY1 < nY2;

                for (nX = nX1, nY = nY1; nX <= nX2; nX++)
                {
                    SetPixel(nY, nX, rLineColor);

                    if (nD < 0)
                        nD += nDY2;
                    else
                    {
                        nD += nDYX;

                        if (bPos)
                            nY++;
                        else
                            nY--;
                    }
                }
            }
            else
            {
                if (rStart.Y() < rEnd.Y())
                {
                    nX1 = rStart.X();
                    nY1 = rStart.Y();
                    nX2 = rEnd.X();
                    nY2 = rEnd.Y();
                }
                else
                {
                    nX1 = rEnd.X();
                    nY1 = rEnd.Y();
                    nX2 = rStart.X();
                    nY2 = rStart.Y();
                }

                const long  nDYX = (nDX - nDY) << 1;
                const long  nDY2 = nDX << 1;
                long nD = nDY2 - nDY;
                bool bPos = nX1 < nX2;

                for (nX = nX1, nY = nY1; nY <= nY2; nY++)
                {
                    SetPixel(nY, nX, rLineColor);

                    if (nD < 0)
                        nD += nDY2;
                    else
                    {
                        nD += nDYX;

                        if (bPos)
                            nX++;
                        else
                            nX--;
                    }
                }
            }
        }
    }
}

void BitmapWriteAccess::FillRect( const Rectangle& rRect )
{
    if (mpFillColor)
    {
        const BitmapColor& rFillColor = *mpFillColor.get();
        Point aPoint;
        Rectangle aRect(aPoint, maBitmap.GetSizePixel());

        aRect.Intersection(rRect);

        if (!aRect.IsEmpty())
        {
            const long nStartX = rRect.Left();
            const long nStartY = rRect.Top();
            const long nEndX = rRect.Right();
            const long nEndY = rRect.Bottom();

            for (long nY = nStartY; nY <= nEndY; nY++)
            {
                for (long nX = nStartX; nX <= nEndX; nX++)
                {
                    SetPixel(nY, nX, rFillColor);
                }
            }
        }
    }
}

void BitmapWriteAccess::DrawRect( const Rectangle& rRect )
{
    if (mpFillColor)
        FillRect(rRect);

    if (mpLineColor && (!mpFillColor || ( *mpFillColor.get() != *mpLineColor.get())))
    {
        DrawLine(rRect.TopLeft(), rRect.TopRight());
        DrawLine(rRect.TopRight(), rRect.BottomRight());
        DrawLine(rRect.BottomRight(), rRect.BottomLeft());
        DrawLine(rRect.BottomLeft(), rRect.TopLeft());
    }
}

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