source: trunk/src/gui/image/qpixmapdata.cpp@ 569

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#include "qpixmapdata_p.h"
#include <QtCore/qbuffer.h>
#include <QtGui/qbitmap.h>
#include <QtGui/qimagereader.h>
#include <private/qgraphicssystem_p.h>
#include <private/qapplication_p.h>

QT_BEGIN_NAMESPACE

const uchar qt_pixmap_bit_mask[] = { 0x01, 0x02, 0x04, 0x08,
                                     0x10, 0x20, 0x40, 0x80 };

QPixmapData *QPixmapData::create(int w, int h, PixelType type)
{
    QPixmapData *data;
    QGraphicsSystem* gs = QApplicationPrivate::graphicsSystem();
    if (gs)
        data = gs->createPixmapData(static_cast<QPixmapData::PixelType>(type));
    else
        data = QGraphicsSystem::createDefaultPixmapData(static_cast<QPixmapData::PixelType>(type));
    data->resize(w, h);
    return data;
}


QPixmapData::QPixmapData(PixelType pixelType, int objectId)
    : w(0),
      h(0),
      d(0),
      is_null(true),
      ref(0),
      detach_no(0),
      type(pixelType),
      id(objectId),
      ser_no(0),
      is_cached(false)
{
}

QPixmapData::~QPixmapData()
{
}

QPixmapData *QPixmapData::createCompatiblePixmapData() const
{
    QPixmapData *d;
    QGraphicsSystem *gs = QApplicationPrivate::graphicsSystem();
    if (gs)
        d = gs->createPixmapData(pixelType());
    else
        d = QGraphicsSystem::createDefaultPixmapData(pixelType());
    return d;
}

static QImage makeBitmapCompliantIfNeeded(QPixmapData *d, const QImage &image, Qt::ImageConversionFlags flags)
{
    if (d->pixelType() == QPixmapData::BitmapType) {
        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);
        }
        return img;
    }

    return image;
}

bool QPixmapData::fromFile(const QString &fileName, const char *format,
                           Qt::ImageConversionFlags flags)
{
    QImage image = QImageReader(fileName, format).read();
    if (image.isNull())
        return false;
    fromImage(makeBitmapCompliantIfNeeded(this, image, flags), flags);
    return !isNull();
}

bool QPixmapData::fromData(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);
    QImage image = QImageReader(&b, format).read();
    fromImage(makeBitmapCompliantIfNeeded(this, image, flags), flags);
    return !isNull();
}

void QPixmapData::copy(const QPixmapData *data, const QRect &rect)
{
    fromImage(data->toImage().copy(rect), Qt::AutoColor);
}

bool QPixmapData::scroll(int dx, int dy, const QRect &rect)
{
    Q_UNUSED(dx);
    Q_UNUSED(dy);
    Q_UNUSED(rect);
    return false;
}