qbitmap.cpp

Go to the documentation of this file.

/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qbitmap.h"
#include "qpixmapdata_p.h"
#include "qimage.h"
#include "qvariant.h"
#include <qpainter.h>
#include <private/qgraphicssystem_p.h>
#include <private/qapplication_p.h>

QT_BEGIN_NAMESPACE

QBitmap::QBitmap()
    : QPixmap(QSize(0, 0), QPixmapData::BitmapType)
{
}

QBitmap::QBitmap(int w, int h)
    : QPixmap(QSize(w, h), QPixmapData::BitmapType)
{
}

QBitmap::QBitmap(const QSize &size)
    : QPixmap(size, QPixmapData::BitmapType)
{
}

QBitmap::QBitmap(const QPixmap &pixmap)
{
    QBitmap::operator=(pixmap);
}

QBitmap::QBitmap(const QString& fileName, const char *format)
    : QPixmap(QSize(0, 0), QPixmapData::BitmapType)
{
    load(fileName, format, Qt::MonoOnly);
}

QBitmap &QBitmap::operator=(const QPixmap &pixmap)
{
    if (pixmap.isNull()) {                        // a null pixmap
        QBitmap bm(0, 0);
        QBitmap::operator=(bm);
    } else if (pixmap.depth() == 1) {                // 1-bit pixmap
        QPixmap::operator=(pixmap);                // shallow assignment
    } else {                                        // n-bit depth pixmap
        QImage image;
        image = pixmap.toImage();                                // convert pixmap to image
        *this = fromImage(image);                                // will dither image
    }
    return *this;
}


#ifdef QT3_SUPPORT
QBitmap::QBitmap(int w, int h, const uchar *bits, bool isXbitmap)
{
    *this = fromData(QSize(w, h), bits, isXbitmap ? QImage::Format_MonoLSB : QImage::Format_Mono);
}


QBitmap::QBitmap(const QSize &size, const uchar *bits, bool isXbitmap)
{
    *this = fromData(size, bits, isXbitmap ? QImage::Format_MonoLSB : QImage::Format_Mono);
}
#endif

QBitmap::~QBitmap()
{
}

QBitmap::operator QVariant() const
{
    return QVariant(QVariant::Bitmap, this);
}

QBitmap QBitmap::fromImage(const QImage &image, Qt::ImageConversionFlags flags)
{
    if (image.isNull())
        return QBitmap();

    QImage img = image.convertToFormat(QImage::Format_MonoLSB, flags);

    // make sure image.color(0) == Qt::color0 (white)
    // and image.color(1) == Qt::color1 (black)
    const QRgb c0 = QColor(Qt::black).rgb();
    const QRgb c1 = QColor(Qt::white).rgb();
    if (img.color(0) == c0 && img.color(1) == c1) {
        img.invertPixels();
        img.setColor(0, c1);
        img.setColor(1, c0);
    }

    QGraphicsSystem* gs = QApplicationPrivate::graphicsSystem();
    QScopedPointer<QPixmapData> data(gs ? gs->createPixmapData(QPixmapData::BitmapType)
                : QGraphicsSystem::createDefaultPixmapData(QPixmapData::BitmapType));

    data->fromImage(img, flags | Qt::MonoOnly);
    return QPixmap(data.take());
}

QBitmap QBitmap::fromData(const QSize &size, const uchar *bits, QImage::Format monoFormat)
{
    Q_ASSERT(monoFormat == QImage::Format_Mono || monoFormat == QImage::Format_MonoLSB);

    QImage image(size, monoFormat);
    image.setColor(0, QColor(Qt::color0).rgb());
    image.setColor(1, QColor(Qt::color1).rgb());

    // Need to memcpy each line separatly since QImage is 32bit aligned and
    // this data is only byte aligned...
    int bytesPerLine = (size.width() + 7) / 8;
    for (int y = 0; y < size.height(); ++y)
        memcpy(image.scanLine(y), bits + bytesPerLine * y, bytesPerLine);
    return QBitmap::fromImage(image);
}

QBitmap QBitmap::transformed(const QTransform &matrix) const
{
    QBitmap bm = QPixmap::transformed(matrix);
    return bm;
}

QBitmap QBitmap::transformed(const QMatrix &matrix) const
{
    return transformed(QTransform(matrix));
}

#ifdef QT3_SUPPORT

#endif

QT_END_NAMESPACE