/* -*- 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 <sal/config.h>

#include <algorithm>

#include "PresenterUIPainter.hxx"

#include "PresenterGeometryHelper.hxx"
#include <com/sun/star/rendering/CompositeOperation.hpp>

using namespace ::com::sun::star;
using namespace ::com::sun::star::uno;

namespace sdext::presenter {

void PresenterUIPainter::PaintHorizontalBitmapComposite (
    const css::uno::Reference<css::rendering::XCanvas>& rxCanvas,
    const css::awt::Rectangle& rRepaintBox,
    const css::awt::Rectangle& rBoundingBox,
    const css::uno::Reference<css::rendering::XBitmap>& rxLeftBitmap,
    const css::uno::Reference<css::rendering::XBitmap>& rxRepeatableCenterBitmap,
    const css::uno::Reference<css::rendering::XBitmap>& rxRightBitmap)
{
    if (PresenterGeometryHelper::AreRectanglesDisjoint(rRepaintBox, rBoundingBox))
    {
        // The bounding box lies completely outside the repaint area.
        // Nothing has to be repainted.
        return;
    }

    // Get bitmap sizes.
    geometry::IntegerSize2D aLeftBitmapSize;
    if (rxLeftBitmap.is())
        aLeftBitmapSize = rxLeftBitmap->getSize();
    geometry::IntegerSize2D aCenterBitmapSize;
    if (rxRepeatableCenterBitmap.is())
        aCenterBitmapSize = rxRepeatableCenterBitmap->getSize();
    geometry::IntegerSize2D aRightBitmapSize;
    if (rxRightBitmap.is())
        aRightBitmapSize = rxRightBitmap->getSize();

    // Prepare painting.
    rendering::ViewState aViewState (
        geometry::AffineMatrix2D(1,0,0, 0,1,0),
        nullptr);

    rendering::RenderState aRenderState (
        geometry::AffineMatrix2D(1,0,0, 0,1,0),
        nullptr,
        Sequence<double>(4),
        rendering::CompositeOperation::SOURCE);

    // Paint the left bitmap once.
    if (rxLeftBitmap.is())
    {
        const awt::Rectangle aLeftBoundingBox (
            rBoundingBox.X,
            rBoundingBox.Y,
            ::std::min(aLeftBitmapSize.Width, rBoundingBox.Width),
            rBoundingBox.Height);
        aViewState.Clip.set(
            PresenterGeometryHelper::CreatePolygon(
                PresenterGeometryHelper::Intersection(rRepaintBox, aLeftBoundingBox),
                rxCanvas->getDevice()));
        aRenderState.AffineTransform.m02 = aLeftBoundingBox.X;
        aRenderState.AffineTransform.m12
            = aLeftBoundingBox.Y + (aLeftBoundingBox.Height - aLeftBitmapSize.Height) / 2;
        rxCanvas->drawBitmap(rxLeftBitmap, aViewState, aRenderState);
    }

    // Paint the right bitmap once.
    if (rxRightBitmap.is())
    {
        const awt::Rectangle aRightBoundingBox (
            rBoundingBox.X + rBoundingBox.Width - aRightBitmapSize.Width,
            rBoundingBox.Y,
            ::std::min(aRightBitmapSize.Width, rBoundingBox.Width),
            rBoundingBox.Height);
        aViewState.Clip.set(
            PresenterGeometryHelper::CreatePolygon(
                PresenterGeometryHelper::Intersection(rRepaintBox, aRightBoundingBox),
                rxCanvas->getDevice()));
        aRenderState.AffineTransform.m02
            = aRightBoundingBox.X + aRightBoundingBox.Width - aRightBitmapSize.Width;
        aRenderState.AffineTransform.m12
            = aRightBoundingBox.Y + (aRightBoundingBox.Height - aRightBitmapSize.Height) / 2;
        rxCanvas->drawBitmap(rxRightBitmap, aViewState, aRenderState);
    }

    // Paint the center bitmap to fill the remaining space.
    if (!rxRepeatableCenterBitmap.is())
        return;

    const awt::Rectangle aCenterBoundingBox (
        rBoundingBox.X + aLeftBitmapSize.Width,
        rBoundingBox.Y,
        rBoundingBox.Width - aLeftBitmapSize.Width - aRightBitmapSize.Width,
        rBoundingBox.Height);
    if (aCenterBoundingBox.Width <= 0)
        return;

    aViewState.Clip.set(
        PresenterGeometryHelper::CreatePolygon(
            PresenterGeometryHelper::Intersection(rRepaintBox, aCenterBoundingBox),
            rxCanvas->getDevice()));
    sal_Int32 nX (aCenterBoundingBox.X);
    const sal_Int32 nRight (aCenterBoundingBox.X + aCenterBoundingBox.Width - 1);
    aRenderState.AffineTransform.m12
        = aCenterBoundingBox.Y + (aCenterBoundingBox.Height-aCenterBitmapSize.Height) / 2;
    while(nX <= nRight)
    {
        aRenderState.AffineTransform.m02 = nX;
        rxCanvas->drawBitmap(rxRepeatableCenterBitmap, aViewState, aRenderState);
        nX += aCenterBitmapSize.Width;
    }
}

void PresenterUIPainter::PaintVerticalBitmapComposite (
    const css::uno::Reference<css::rendering::XCanvas>& rxCanvas,
    const css::awt::Rectangle& rRepaintBox,
    const css::awt::Rectangle& rBoundingBox,
    const css::uno::Reference<css::rendering::XBitmap>& rxTopBitmap,
    const css::uno::Reference<css::rendering::XBitmap>& rxRepeatableCenterBitmap,
    const css::uno::Reference<css::rendering::XBitmap>& rxBottomBitmap)
{
    if (PresenterGeometryHelper::AreRectanglesDisjoint(rRepaintBox, rBoundingBox))
    {
        // The bounding box lies completely outside the repaint area.
        // Nothing has to be repainted.
        return;
    }

    // Get bitmap sizes.
    geometry::IntegerSize2D aTopBitmapSize;
    if (rxTopBitmap.is())
        aTopBitmapSize = rxTopBitmap->getSize();
    geometry::IntegerSize2D aCenterBitmapSize;
    if (rxRepeatableCenterBitmap.is())
        aCenterBitmapSize = rxRepeatableCenterBitmap->getSize();
    geometry::IntegerSize2D aBottomBitmapSize;
    if (rxBottomBitmap.is())
        aBottomBitmapSize = rxBottomBitmap->getSize();

    // Prepare painting.
    rendering::ViewState aViewState (
        geometry::AffineMatrix2D(1,0,0, 0,1,0),
        nullptr);

    rendering::RenderState aRenderState (
        geometry::AffineMatrix2D(1,0,0, 0,1,0),
        nullptr,
        Sequence<double>(4),
        rendering::CompositeOperation::SOURCE);

    // Paint the top bitmap once.
    if (rxTopBitmap.is())
    {
        const awt::Rectangle aTopBoundingBox (
            rBoundingBox.X,
            rBoundingBox.Y,
            rBoundingBox.Width,
            ::std::min(aTopBitmapSize.Height, rBoundingBox.Height));
        aViewState.Clip.set(
            PresenterGeometryHelper::CreatePolygon(
                PresenterGeometryHelper::Intersection(rRepaintBox, aTopBoundingBox),
                rxCanvas->getDevice()));
        aRenderState.AffineTransform.m02
            = aTopBoundingBox.X + (aTopBoundingBox.Width - aTopBitmapSize.Width) / 2;
        aRenderState.AffineTransform.m12 = aTopBoundingBox.Y;
        rxCanvas->drawBitmap(rxTopBitmap, aViewState, aRenderState);
    }

    // Paint the bottom bitmap once.
    if (rxBottomBitmap.is())
    {
        const sal_Int32 nBBoxHeight (::std::min(aBottomBitmapSize.Height, rBoundingBox.Height));
        const awt::Rectangle aBottomBoundingBox (
            rBoundingBox.X,
            rBoundingBox.Y  + rBoundingBox.Height - nBBoxHeight,
            rBoundingBox.Width,
            nBBoxHeight);
        aViewState.Clip.set(
            PresenterGeometryHelper::CreatePolygon(
                PresenterGeometryHelper::Intersection(rRepaintBox, aBottomBoundingBox),
                rxCanvas->getDevice()));
        aRenderState.AffineTransform.m02
            = aBottomBoundingBox.X + (aBottomBoundingBox.Width - aBottomBitmapSize.Width) / 2;
        aRenderState.AffineTransform.m12
            = aBottomBoundingBox.Y + aBottomBoundingBox.Height - aBottomBitmapSize.Height;
        rxCanvas->drawBitmap(rxBottomBitmap, aViewState, aRenderState);
    }

    // Paint the center bitmap to fill the remaining space.
    if (!rxRepeatableCenterBitmap.is())
        return;

    const awt::Rectangle aCenterBoundingBox (
        rBoundingBox.X,
        rBoundingBox.Y + aTopBitmapSize.Height,
        rBoundingBox.Width,
        rBoundingBox.Height - aTopBitmapSize.Height - aBottomBitmapSize.Height);
    if (aCenterBoundingBox.Height <= 0)
        return;

    aViewState.Clip.set(
        PresenterGeometryHelper::CreatePolygon(
            PresenterGeometryHelper::Intersection(rRepaintBox, aCenterBoundingBox),
            rxCanvas->getDevice()));
    sal_Int32 nY (aCenterBoundingBox.Y);
    const sal_Int32 nBottom (aCenterBoundingBox.Y + aCenterBoundingBox.Height - 1);
    aRenderState.AffineTransform.m02
        = aCenterBoundingBox.X + (aCenterBoundingBox.Width-aCenterBitmapSize.Width) / 2;
    while(nY <= nBottom)
    {
        aRenderState.AffineTransform.m12 = nY;
        rxCanvas->drawBitmap(rxRepeatableCenterBitmap, aViewState, aRenderState);
        nY += aCenterBitmapSize.Height;
    }
}

} // end of namespace sdext::presenter

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
