/* -*- 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 <vcl/GraphicNativeTransform.hxx>
 
#include <vcl/gfxlink.hxx>
#include <vcl/graphicfilter.hxx>
#include <com/sun/star/beans/PropertyValue.hpp>
#include <com/sun/star/uno/Sequence.hxx>
#include <tools/stream.hxx>
#include <comphelper/propertyvalue.hxx>
 
#include "jpeg/Exif.hxx"
#include "jpeg/JpegTransform.hxx"
 
GraphicNativeTransform::GraphicNativeTransform(Graphic& rGraphic)
    : mrGraphic(rGraphic)
{
}
 
void GraphicNativeTransform::rotate(Degree10 aInputRotation)
{
    // Rotation can be between 0 and 3600
    Degree10 aRotation = aInputRotation % 3600_deg10;
 
    if (aRotation == 0_deg10)
    {
        return; // No rotation is needed
    }
    else if (aRotation != 900_deg10 && aRotation != 1800_deg10 && aRotation != 2700_deg10)
    {
        return;
    }
 
    GfxLink aLink = mrGraphic.GetGfxLink();
    if (aLink.GetType() == GfxLinkType::NativeJpg)
    {
        rotateJPEG(aRotation);
    }
    else if (aLink.GetType() == GfxLinkType::NativePng)
    {
        rotateGeneric(aRotation, u"png");
    }
    else if (aLink.GetType() == GfxLinkType::NativeGif)
    {
        rotateGeneric(aRotation, u"gif");
    }
    else if (aLink.GetType() == GfxLinkType::NONE)
    {
        rotateBitmapOnly(aRotation);
    }
}
 
bool GraphicNativeTransform::rotateBitmapOnly(Degree10 aRotation)
{
    if (mrGraphic.IsAnimated())
    {
        return false;
    }
 
    BitmapEx aBitmap = mrGraphic.GetBitmapEx();
    aBitmap.Rotate(aRotation, COL_BLACK);
    mrGraphic = aBitmap;
 
    return true;
}
 
bool GraphicNativeTransform::rotateGeneric(Degree10 aRotation, std::u16string_view aType)
{
    // Can't rotate animations yet
    if (mrGraphic.IsAnimated())
    {
        return false;
    }
 
    SvMemoryStream aStream;
 
    GraphicFilter& rFilter = GraphicFilter::GetGraphicFilter();
 
    css::uno::Sequence<css::beans::PropertyValue> aFilterData{
        comphelper::makePropertyValue(u"Interlaced"_ustr, sal_Int32(0)),
        comphelper::makePropertyValue(u"Compression"_ustr, sal_Int32(9)),
        comphelper::makePropertyValue(u"Quality"_ustr, sal_Int32(90))
    };
 
    sal_uInt16 nFilterFormat = rFilter.GetExportFormatNumberForShortName(aType);
 
    BitmapEx aBitmap = mrGraphic.GetBitmapEx();
    aBitmap.Rotate(aRotation, COL_BLACK);
    rFilter.ExportGraphic(aBitmap, u"none", aStream, nFilterFormat, &aFilterData);
 
    aStream.Seek(STREAM_SEEK_TO_BEGIN);
 
    Graphic aGraphic;
    rFilter.ImportGraphic(aGraphic, u"import", aStream);
 
    mrGraphic = std::move(aGraphic);
    return true;
}
 
void GraphicNativeTransform::rotateJPEG(Degree10 aRotation)
{
    BitmapEx aBitmap = mrGraphic.GetBitmapEx();
 
    if (aBitmap.GetSizePixel().Width() % 16 != 0 || aBitmap.GetSizePixel().Height() % 16 != 0)
    {
        rotateGeneric(aRotation, u"png");
    }
    else
    {
        GfxLink aLink = mrGraphic.GetGfxLink();
 
        SvMemoryStream aSourceStream;
        aSourceStream.WriteBytes(aLink.GetData(), aLink.GetDataSize());
        aSourceStream.Seek(STREAM_SEEK_TO_BEGIN);
 
        exif::Orientation aOrientation = exif::TOP_LEFT;
 
        Exif exif;
        if (exif.read(aSourceStream))
        {
            aOrientation = exif.getOrientation();
        }
 
        SvMemoryStream aTargetStream;
        JpegTransform transform(aSourceStream, aTargetStream);
        transform.setRotate(aRotation);
        transform.perform();
 
        aTargetStream.Seek(STREAM_SEEK_TO_BEGIN);
 
        // Reset orientation in exif if needed
        if (exif.hasExif() && aOrientation != exif::TOP_LEFT)
        {
            exif.setOrientation(exif::TOP_LEFT);
            exif.write(aTargetStream);
        }
 
        aTargetStream.Seek(STREAM_SEEK_TO_BEGIN);
 
        Graphic aGraphic;
        GraphicFilter& rFilter = GraphicFilter::GetGraphicFilter();
        rFilter.ImportGraphic(aGraphic, u"import", aTargetStream);
        mrGraphic = std::move(aGraphic);
    }
}
 
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

↑ V530 The return value of function 'ExportGraphic' is required to be utilized.

↑ V530 The return value of function 'ImportGraphic' is required to be utilized.

↑ V530 The return value of function 'ImportGraphic' is required to be utilized.