/* -*- 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 <headless/BitmapHelper.hxx>

#include <vcl/cairo.hxx>

#include <vcl/CairoFormats.hxx>

#include <vcl/svapp.hxx>

#include <utility>

BitmapHelper::BitmapHelper(const SalBitmap& rSourceBitmap, const bool bForceARGB32)

#ifdef HAVE_CAIRO_FORMAT_RGB24_888

    : m_bForceARGB32(bForceARGB32)

#endif

{

    const SvpSalBitmap& rSrcBmp = static_cast<const SvpSalBitmap&>(rSourceBitmap);

#ifdef HAVE_CAIRO_FORMAT_RGB24_888

    if ((rSrcBmp.GetBitCount() != 32 && rSrcBmp.GetBitCount() != 24) || bForceARGB32)

#else

    (void)bForceARGB32;

    if (rSrcBmp.GetBitCount() != 32)

#endif

    {

        //big stupid copy here

        const BitmapBuffer* pSrc = rSrcBmp.GetBuffer();

        const SalTwoRect aTwoRect

            = { 0, 0, pSrc->mnWidth, pSrc->mnHeight, 0, 0, pSrc->mnWidth, pSrc->mnHeight };

        std::optional<BitmapBuffer> pTmp

            = (pSrc->meFormat == SVP_24BIT_FORMAT

               && pSrc->meDirection == ScanlineDirection::TopDown)

                  ? FastConvert24BitRgbTo32BitCairo(pSrc)

                  : StretchAndConvert(*pSrc, aTwoRect, SVP_CAIRO_FORMAT);

        aTmpBmp.Create(std::move(pTmp));

        assert(aTmpBmp.GetBitCount() == 32);

        implSetSurface(CairoCommon::createCairoSurface(aTmpBmp.GetBuffer()));

    }

    else

    {

        implSetSurface(CairoCommon::createCairoSurface(rSrcBmp.GetBuffer()));

    }

}

void BitmapHelper::mark_dirty() { cairo_surface_mark_dirty(implGetSurface()); }

unsigned char* BitmapHelper::getBits(sal_Int32& rStride)

{

    cairo_surface_flush(implGetSurface());

    unsigned char* mask_data = cairo_image_surface_get_data(implGetSurface());

    const cairo_format_t nFormat = cairo_image_surface_get_format(implGetSurface());

#ifdef HAVE_CAIRO_FORMAT_RGB24_888

    if (!m_bForceARGB32)

        assert(nFormat == CAIRO_FORMAT_RGB24_888 && "Expected RGB24_888 image");

    else

#endif

    {

        assert(nFormat == CAIRO_FORMAT_ARGB32

               && "need to implement CAIRO_FORMAT_A1 after all here");

    }

    rStride

        = cairo_format_stride_for_width(nFormat, cairo_image_surface_get_width(implGetSurface()));

    return mask_data;

}

namespace

{

// check for env var that decides for using downscale pattern

const char* pDisableDownScale(getenv("SAL_DISABLE_CAIRO_DOWNSCALE"));

bool bDisableDownScale(nullptr != pDisableDownScale);

sal_Int64 estimateUsageInBytesForSurfaceHelper(const SurfaceHelper* pHelper)

{

    sal_Int64 nRetval(0);

    if (nullptr != pHelper)

    {

        cairo_surface_t* pSurface(pHelper->getSurface());

        if (pSurface)

        {

            const tools::Long nStride(cairo_image_surface_get_stride(pSurface));

            const tools::Long nHeight(cairo_image_surface_get_height(pSurface));

            nRetval = nStride * nHeight;

            // if we do downscale, size will grow by 1/4 + 1/16 + 1/32 + ...,

            // rough estimation just multiplies by 1.25, should be good enough

            // for estimation of buffer survival time

            if (!bDisableDownScale)

            {

                nRetval = (nRetval * 5) / 4;

            }

        }

    }

    return nRetval;

}

} // end anonymous namespace

SystemDependentData_BitmapHelper::SystemDependentData_BitmapHelper(

    std::shared_ptr<BitmapHelper> xBitmapHelper)

    : basegfx::SystemDependentData(Application::GetSystemDependentDataManager(),

                                   basegfx::SDD_Type::SDDType_BitmapHelper)

    , maBitmapHelper(std::move(xBitmapHelper))

{

}

sal_Int64 SystemDependentData_BitmapHelper::estimateUsageInBytes() const

{

    return estimateUsageInBytesForSurfaceHelper(maBitmapHelper.get());

}

namespace

{

// MM02 decide to use buffers or not

const char* pDisableMM02Goodies(getenv("SAL_DISABLE_MM02_GOODIES"));

bool bUseBuffer(nullptr == pDisableMM02Goodies);

const tools::Long nMinimalSquareSizeToBuffer(64 * 64);

}

void tryToUseSourceBuffer(const SalBitmap& rSourceBitmap, std::shared_ptr<BitmapHelper>& rSurface)

{

    // MM02 try to access buffered BitmapHelper

    std::shared_ptr<SystemDependentData_BitmapHelper> pSystemDependentData_BitmapHelper;

    const bool bBufferSource(bUseBuffer

                             && rSourceBitmap.GetSize().Width() * rSourceBitmap.GetSize().Height()

                                    > nMinimalSquareSizeToBuffer);

    if (bBufferSource)

    {

        pSystemDependentData_BitmapHelper

            = rSourceBitmap.getSystemDependentData<SystemDependentData_BitmapHelper>(

                basegfx::SDD_Type::SDDType_BitmapHelper);

        if (pSystemDependentData_BitmapHelper)

        {

            // reuse buffered data

            rSurface = pSystemDependentData_BitmapHelper->getBitmapHelper();

        }

    }

    if (rSurface)

        return;

    // create data on-demand

    rSurface = std::make_shared<BitmapHelper>(rSourceBitmap);

    if (bBufferSource)

    {

        // add to buffering mechanism to potentially reuse next time

        rSourceBitmap.addOrReplaceSystemDependentData<SystemDependentData_BitmapHelper>(rSurface);

    }

}

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