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/*
Copyright (C) 2009 Canonical
Author: Aurélien Gâteau <aurelien.gateau@canonical.com>
This program is free software: you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 2 or 3 of the License.
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 Lesser
General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "imageconverter.h"
#include <QDBusArgument>
#include <QDBusMetaType>
#include <QImage>
namespace ImageConverter
{
/**
* A structure representing an image which can be marshalled to fit the
* notification spec.
*/
struct SpecImage
{
int width, height, rowStride;
bool hasAlpha;
int bitsPerSample, channels;
QByteArray data;
};
QDBusArgument &operator<<(QDBusArgument &argument, const SpecImage &image)
{
argument.beginStructure();
argument << image.width << image.height << image.rowStride << image.hasAlpha;
argument << image.bitsPerSample << image.channels << image.data;
argument.endStructure();
return argument;
}
const QDBusArgument &operator>>(const QDBusArgument &argument, SpecImage &image)
{
argument.beginStructure();
argument >> image.width >> image.height >> image.rowStride >> image.hasAlpha;
argument >> image.bitsPerSample >> image.channels >> image.data;
argument.endStructure();
return argument;
}
} // namespace
// This must be before the QVariant::fromValue below (#211726)
Q_DECLARE_METATYPE(ImageConverter::SpecImage)
namespace ImageConverter
{
QVariant variantForImage(const QImage &_image)
{
qDBusRegisterMetaType<SpecImage>();
QImage image = _image.convertToFormat(QImage::Format_ARGB32);
int rowStride = image.width() * 4;
// Notification spec stores pixels in R,G,B,A order, regardless of
// endianess
// Qt represents pixels as 32 bit unsigned int. So the order depend on
// endianess:
// - In big endian the order is A,R,G,B
// - In little endian the order is B,G,R,A
QByteArray data;
data.resize(rowStride * image.height());
char* dst = data.data();
for (int y=0; y<image.height(); ++y) {
QRgb* src = (QRgb*)image.scanLine(y);
QRgb* end = src + image.width();
for (;src != end; ++src) {
// Probably slow, but free of endianess issues
*dst++ = qRed(*src);
*dst++ = qGreen(*src);
*dst++ = qBlue(*src);
*dst++ = qAlpha(*src);
}
}
SpecImage specImage;
specImage.width = image.width();
specImage.height = image.height();
specImage.rowStride = rowStride;
specImage.hasAlpha = true;
specImage.bitsPerSample = 8;
specImage.channels = 4;
specImage.data = data;
return QVariant::fromValue(specImage);
}
} // namespace
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