kde-playground/kdepim/messagecomposer/imagescaling/imagescalingjob.cpp

/*
  Copyright (c) 2012-2013 Montel Laurent <montel@kde.org>

  This program is free software; you can redistribute it and/or modify it
  under the terms of the GNU General Public License, version 2, as
  published by the Free Software Foundation.

  This program is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License along
  with this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/
#include "imagescalingjob.h"
#include "settings/messagecomposersettings.h"

#include <QBuffer>
#include <QImage>

using namespace MessageComposer;

ImageScalingJob::ImageScalingJob(QObject *parent)
    :QObject(parent)
{
}

ImageScalingJob::~ImageScalingJob()
{
}

bool ImageScalingJob::loadImageFromData(const QByteArray& data)
{
    if (!mImage.loadFromData(data)) {
        return false;
    }
    return true;
}

bool ImageScalingJob::resizeImage()
{
    if (mImage.isNull())
        return false;
    const int width = mImage.width();
    const int height = mImage.height();
    int newWidth = -1;
    int newHeight = -1;
    if (MessageComposer::MessageComposerSettings::self()->reduceImageToMaximum()) {

        int maximumWidth = MessageComposer::MessageComposerSettings::self()->maximumWidth();
        if (maximumWidth == -1) {
            maximumWidth =  MessageComposer::MessageComposerSettings::self()->customMaximumWidth();
        }
        int maximumHeight = MessageComposer::MessageComposerSettings::self()->maximumHeight();
        if (maximumHeight == -1) {
            maximumHeight = MessageComposer::MessageComposerSettings::self()->customMaximumHeight();
        }
        if ( width > maximumWidth ) {
            newWidth = maximumWidth;
        } else {
            newWidth = width;
        }
        if (height > maximumHeight) {
            newHeight = maximumHeight;
        } else {
            newHeight = height;
        }
    } else {
        newHeight = height;
        newWidth = width;
    }

    if (MessageComposer::MessageComposerSettings::self()->enlargeImageToMinimum()) {

        int minimumWidth = MessageComposer::MessageComposerSettings::self()->minimumWidth();
        if (minimumWidth == -1) {
            minimumWidth =  MessageComposer::MessageComposerSettings::self()->customMinimumWidth();
        }

        int minimumHeight = MessageComposer::MessageComposerSettings::self()->minimumHeight();
        if (minimumHeight == -1) {
            minimumHeight = MessageComposer::MessageComposerSettings::self()->customMinimumHeight();
        }
        if (newWidth < minimumWidth) {
            newWidth = minimumWidth;
        }
        if (newHeight < minimumHeight) {
            newHeight = minimumHeight;
        }
    }
    if ((newHeight != height) || (newWidth != width)) {
        mBuffer.open(QIODevice::WriteOnly);
        mImage = mImage.scaled(newWidth,newHeight, MessageComposer::MessageComposerSettings::self()->keepImageRatio() ? Qt::KeepAspectRatio : Qt::IgnoreAspectRatio);
        const bool result = mImage.save(&mBuffer,MessageComposer::MessageComposerSettings::self()->writeFormat().toLocal8Bit());
        mBuffer.close();
        return result;
    } else {
        return false;
    }
    return true;

}

QByteArray ImageScalingJob::mimetype() const
{
    //Add more mimetype if a day we add more saving format.
    const QString type = MessageComposer::MessageComposerSettings::self()->writeFormat();
    if (type == QLatin1String("JPG")) {
        return "image/jpeg";
    } else if (type == QLatin1String("PNG")) {
        return "image/png";
    }
    return QByteArray();
}

QByteArray ImageScalingJob::imageArray() const
{
    return mBuffer.data();
}