qpixmap_raster.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

#ifndef QT_NO_IMAGE_HEURISTIC_MASK
QBitmap QPixmap::createHeuristicMask(bool clipTight ) const
{
    QBitmap m = fromImage(toImage().createHeuristicMask(clipTight));
    return m;
}
#endif

QBitmap QPixmap::createMaskFromColor(const QColor &maskColor) const
{
    QImage maskImage(size(), QImage::Format_MonoLSB);
    QImage image = toImage();
    QRgb mColor = maskColor.rgba();
    for (int w = 0; w < width(); w++) {
        for (int h = 0; h < height(); h++) {
            if (image.pixel(w, h) == mColor)
                maskImage.setPixel(w, h, Qt::color1);
            else
                maskImage.setPixel(w, h, Qt::color0);
        }
    }
    QBitmap m = fromImage(maskImage);
    return m;
}


QPixmap QPixmap::grabWidget(QWidget *widget, const QRect &rect)
{
    if (!widget)
        return QPixmap();

    QRect r(rect);
    if (r.width() < 0)
        r.setWidth(widget->width() - rect.x());
    if (r.height() < 0)
        r.setHeight(widget->height() - rect.y());

    if (!r.intersects(widget->rect()))
        return QPixmap();

     QPixmap res(r.size());

    widget->d_func()->drawWidget(&res, r, -r.topLeft(), QWidgetPrivate::DrawRecursive | QWidgetPrivate::DrawAsRoot | QWidgetPrivate::DrawPaintOnScreen | QWidgetPrivate::DrawInvisible);
    return res;
}


QPixmap QPixmap::scaled(const QSize &size, Qt::AspectRatioMode aspectMode,
                       Qt::TransformationMode mode ) const
{
    return QPixmap::fromImage(data->image.scaled(size, aspectMode, mode));
}

QPixmap QPixmap::scaledToWidth(int w, Qt::TransformationMode mode) const
{
    return QPixmap::fromImage(data->image.scaledToWidth(w, mode));
}

QPixmap QPixmap::scaledToHeight(int h, Qt::TransformationMode mode) const
{
    return QPixmap::fromImage(data->image.scaledToHeight(h, mode));
}

QPixmap QPixmap::transformed(const QMatrix &matrix, Qt::TransformationMode mode ) const
{
    return QPixmap::fromImage(data->image.transformed(matrix, mode));
}


QMatrix QPixmap::trueMatrix(const QMatrix &m, int w, int h)
{
    return QImage::trueMatrix(m, w, h);
}

QImage QPixmap::toImage() const
{
    return data->image;
}

QPixmap QPixmap::fromImage(const QImage &image, Qt::ImageConversionFlags flags )
{
    Q_UNUSED(flags);
    // ### This will create a temporary image.
    QPixmap pixmap(image.width(), image.height());

    switch (image.format()) {
    case QImage::Format_Mono:
    case QImage::Format_MonoLSB:
        pixmap.data->image = image.convertToFormat(QImage::Format_RGB32);
        break;
    case QImage::Format_RGB32:
    case QImage::Format_ARGB32_Premultiplied:
#ifdef Q_WS_QWS
    case QImage::Format_RGB16:
#endif
        pixmap.data->image = image;
        break;
    default:
        pixmap.data->image = image.convertToFormat(QImage::Format_ARGB32_Premultiplied);
        break;
    }

    return pixmap;
}

bool QPixmap::load(const QString& fileName, const char *format, Qt::ImageConversionFlags flags )
{
    if (fileName.isEmpty())
        return false;

    QFileInfo info(fileName);
    QString key;
    key.append(QLatin1String("qt_pixmap_")).append(info.absoluteFilePath()).append(
               QLatin1Char('_')).append(QString::number(info.lastModified().toTime_t())).append(
               QLatin1Char('_')).append(QString::number(data->type));

    detach();
    if (QPixmapCache::find(key, *this))
            return true;
    QImage image = QImageReader(fileName, format).read();

    if (!image.isNull()) {
        if (data->type == BitmapType)
            *this = QBitmap::fromImage(image, flags);
        else
            *this = fromImage(image, flags);
        if (!isNull()) {
            QPixmapCache::insert(key, *this);
            return true;
        }
    }
    return false;
}

bool QPixmap::loadFromData(const uchar *buf, uint len, const char* format, Qt::ImageConversionFlags flags )
{
    QByteArray a = QByteArray::fromRawData(reinterpret_cast<const char *>(buf), len);
    QBuffer b(&a);
    b.open(QIODevice::ReadOnly);

    detach();
    QImage image = QImageReader(&b, format).read();
    if (!image.isNull()) {
        if (data->type == BitmapType)
            *this = QBitmap::fromImage(image, flags);
        else
            *this = fromImage(image, flags);
    }
    return !isNull();
}

bool QPixmap::save(const QString& fileName, const char* format, int quality ) const
{
    if (isNull())
        return false;                                // nothing to save
    QImageWriter writer(fileName, format);
    return doImageIO(&writer, quality);
}

bool QPixmap::save(QIODevice* device, const char* format, int quality ) const
{
    if (isNull())
        return false;                                // nothing to save
    QImageWriter writer(device, format);
    return doImageIO(&writer, quality);
}

int QPixmap::serialNumber() const
{
    return data->image.serialNumber();
}

bool QPixmap::isDetached() const
{
    return data->count == 1;
}

void QPixmap::detach()
{
    ++data->detach_no;
    if (data->count != 1)
        *this = copy();
}

#ifdef QT3_SUPPORT
static Qt::ImageConversionFlags colorModeToFlags(QPixmap::ColorMode mode)
{
    Qt::ImageConversionFlags flags = Qt::AutoColor;
    switch (mode) {
      case QPixmap::Color:
        flags |= Qt::ColorOnly;
        break;
      case QPixmap::Mono:
        flags |= Qt::MonoOnly;
        break;
      default:
        break;// Nothing.
    }
    return flags;
}

bool QPixmap::load(const QString& fileName, const char *format, ColorMode mode)
{
    return load(fileName, format, colorModeToFlags(mode));
}

bool QPixmap::loadFromData(const uchar *buf, uint len, const char* format, ColorMode mode)
{
    return loadFromData(buf, len, format, colorModeToFlags(mode));
}

bool QPixmap::convertFromImage(const QImage &image, ColorMode mode)
{
    *this = fromImage(image, colorModeToFlags(mode));
    return !isNull();
}
#endif // QT3_SUPPORT

int QPixmap::metric(PaintDeviceMetric metric) const
{
    return data->image.metric(metric);
}

bool QPixmap::doImageIO(QImageWriter *writer, int quality) const
{
    if (quality > 100  || quality < -1)
        qWarning("QPixmap::save: quality out of range [-1,100]");
    if (quality >= 0)
        writer->setQuality(qMin(quality,100));
    return writer->write(toImage());
}

void QPixmap::init(int w, int h, Type type)
{
    if (!qApp) {
        qFatal("QPixmap: Must construct a QApplication before a QPaintDevice");
        return;
    }
    data = new QPixmapData;
    data->type = type;
    data->detach_no = 0;
    if (type == PixmapType) {
        data->image = QImage(w, h, QImage::Format_RGB32);
    } else {
        data->image = data->createBitmapImage(w, h);
    }
}

void QPixmap::deref()
{
    if(data && data->deref()) { // Destroy image if last ref
        delete data;
        data = 0;
    }
}

QPixmap QPixmap::copy(const QRect &rect) const
{
    if (data->type == BitmapType)
        return QBitmap::fromImage(toImage().copy(rect));
    else
        return QPixmap::fromImage(toImage().copy(rect));
}

#ifndef QT_NO_DATASTREAM
QDataStream &operator<<(QDataStream &s, const QPixmap &pixmap)
{
    s << pixmap.toImage();
    return s;
}

QDataStream &operator>>(QDataStream &s, QPixmap &pixmap)
{
    QImage img;
    s >> img;
    if (pixmap.data->type == QPixmap::BitmapType)
        pixmap = QBitmap::fromImage(img);
    else
        pixmap = QPixmap::fromImage(img);
    return s;
}
#endif // QT_NO_DATASTREAM

QPaintEngine *QPixmap::paintEngine() const
{
    return data->image.paintEngine();
}

void QPixmap::setAlphaChannel(const QPixmap &alphaChannel)
{
    detach();
    data->image.setAlphaChannel(alphaChannel.toImage());
}

QPixmap QPixmap::alphaChannel() const
{
    return QPixmap::fromImage(data->image.alphaChannel());
}

QImage QPixmapData::createBitmapImage(int w, int h)
{
    QImage bitmap(w, h, QImage::Format_MonoLSB);
    if (bitmap.isNull())
        return bitmap;
    bitmap.setNumColors(2);
    bitmap.setColor(0, QColor(Qt::color0).rgba());
    bitmap.setColor(1, QColor(Qt::color1).rgba());
    return bitmap;
}

#ifdef QT3_SUPPORT
Q_GUI_EXPORT void copyBlt(QPixmap *dst, int dx, int dy,
                          const QPixmap *src, int sx, int sy, int sw, int sh)
{
    Q_ASSERT_X(dst, "::copyBlt", "Destination pixmap must be non null");
    Q_ASSERT_X(src, "::copyBlt", "Source pixmap must be non null");

    QImage image = dst->toImage();
    QPainter p(&image);
    p.setCompositionMode(QPainter::CompositionMode_Source);
    p.drawImage(dx, dy, src->toImage(), sx, sy, sw, sh);
    *dst = QPixmap::fromImage(image);
}
#endif