qvfbview.cpp

Qt4.5 提供的qvfb,最新版本

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#include "qvfbview.h"
#include "qvfbshmem.h"
#include "qvfbmmap.h"

#include "qanimationwriter.h"
#include <QApplication>
#include <QPainter>
#include <QImage>
#include <QBitmap>
#include <QMatrix>
#include <QPaintEvent>
#include <QScrollArea>
#include <QFile>
#include <QDebug>

#ifdef Q_WS_X11
#include <QX11EmbedContainer>
#include <QHBoxLayout>
#endif

#include <stdlib.h>
#include <unistd.h>
#include <sys/ipc.h>
#include <sys/types.h>
#include <sys/shm.h>
#include <sys/stat.h>
#include <sys/sem.h>
#include <fcntl.h>
#include <errno.h>
#include <math.h>

QT_BEGIN_NAMESPACE

extern int qvfb_protocol;

QVFbAbstractView::QVFbAbstractView( QWidget *parent )
#ifdef QVFB_USE_GLWIDGET
    : QGLWidget( parent )
#else
    : QWidget( parent )
#endif
{
}

QVFbAbstractView::~QVFbAbstractView()
{
}

QVFbView::QVFbView(int id, int w, int h, int d, Rotation r, QWidget *parent)
        : QVFbAbstractView(parent),
          viewdepth(d), viewFormat(DefaultFormat), rsh(0), gsh(0), bsh(0), rmax(15), gmax(15), bmax(15),
        contentsWidth(w), contentsHeight(h), gred(1.0), ggreen(1.0), gblue(1.0),
        gammatable(0), refreshRate(30), animation(0),
        hzm(0.0), vzm(0.0), mView(0),
        emulateTouchscreen(false), emulateLcdScreen(false), rotation(r)
#ifdef Q_WS_X11
        , embedContainer(0)
#endif
{
    switch(qvfb_protocol) {
    default:
    case 0:
        mView = new QShMemViewProtocol(id, QSize(w, h), d, this);
        break;
    case 1:
        mView = new QMMapViewProtocol(id, QSize(w, h), d, this);
        break;
    }

    connect(mView, SIGNAL(displayDataChanged(const QRect &)),
            SLOT(refreshDisplay(const QRect &)));
#ifdef Q_WS_X11
    connect(mView, SIGNAL(displayEmbedRequested(WId)),
            this, SLOT(embedDisplay(WId)));
#endif

    setAttribute(Qt::WA_PaintOnScreen, viewFormat != ARGBFormat);
    setMouseTracking(true);
    setFocusPolicy(Qt::StrongFocus);
    setAttribute(Qt::WA_NoSystemBackground);

    setZoom(1.0,1.0);

    setGamma(1.0,1.0,1.0);
    mView->setRate(30);
}

QVFbView::~QVFbView()
{
    stopAnimation();
    sendKeyboardData(0, 0, 0, true, false); // magic die key
#ifdef Q_WS_X11
    delete embedContainer;
#endif
}

QSize QVFbView::sizeHint() const
{
    return QSize(contentsWidth, contentsHeight);
}

void QVFbView::setRate(int i)
{
    mView->setRate(i);
}

void QVFbView::setGamma(double gr, double gg, double gb)
{
    gred = gr; ggreen = gg; gblue = gb;

    switch (viewdepth) {
    case 12:
	rsh = 12;
	gsh = 7;
	bsh = 1;
	rmax = 15;
	gmax = 15;
	bmax = 15;
	break;
    case 15:
        rsh = 10;
        gsh = 5;
        bsh = 0;
        rmax = 31;
        gmax = 31;
        bmax = 31;
        break;
    case 16:
	rsh = 11;
	gsh = 5;
	bsh = 0;
	rmax = 31;
	gmax = 63;
	bmax = 31;
	break;
    case 18:
        rsh = 12;
        gsh = 6;
        bsh = 0;
        rmax = 63;
        gmax = 63;
        bmax = 63;
        break;
    case 24:
    case 32:
	rsh = 16;
	gsh = 8;
	bsh = 0;
	rmax = 255;
	gmax = 255;
	bmax = 255;
    }
    int mm = qMax(rmax,qMax(gmax,bmax))+1;
    if (gammatable)
	delete [] gammatable;
    gammatable = new QRgb[mm];
    for (int i=0; i<mm; i++) {
	int r = int(pow(i,gr)*255/rmax);
	int g = int(pow(i,gg)*255/gmax);
	int b = int(pow(i,gb)*255/bmax);
	if (r > 255) r = 255;
	if (g > 255) g = 255;
	if (b > 255) b = 255;
	gammatable[i] = qRgb(r,g,b);
//qDebug("%d: %d,%d,%d",i,r,g,b);
    }

    mView->flushChanges();
}

void QVFbView::getGamma(int i, QRgb& rgb)
{
    if (i > 255) i = 255;
    if (i < 0) i = 0;
    rgb = qRgb(qRed(gammatable[i*rmax/255]),
               qGreen(gammatable[i*rmax/255]),
               qBlue(gammatable[i*rmax/255]));
}

int QVFbView::displayId() const
{
    return mView->id();
}

int QVFbView::displayWidth() const
{
    return mView->width();
}

int QVFbView::displayHeight() const
{
    return mView->height();
}

int QVFbView::displayDepth() const
{
    return viewdepth;
}

QVFbView::PixelFormat QVFbView::displayFormat() const
{
    return viewFormat;
}

QVFbView::Rotation QVFbView::displayRotation() const
{
    return rotation;
}

void QVFbView::setZoom(double hz, double vz)
{
    if (hzm != hz || vzm != vz) {
	hzm = hz;
	vzm = vz;
        mView->flushChanges();

        contentsWidth = int(displayWidth()*hz);
        contentsHeight = int(displayHeight()*vz);
        if (rotation & 1)
            qSwap(contentsWidth,contentsHeight);
        resize(contentsWidth, contentsHeight);

        if (isVisible()) {
            updateGeometry();
            qApp->sendPostedEvents();
            topLevelWidget()->adjustSize();
            update();
        }
    }
}

void QVFbView::setRotation(QVFbView::Rotation r)
{
    rotation = r;
    // Force update...
    double ohzm = hzm;
    hzm=0.0;
    setZoom(ohzm,vzm);
}

static QRect mapToDevice(const QRect &r, const QSize &s, QVFbView::Rotation rotation)
{
    int x1 = r.x();
    int y1 = r.y();
    int x2 = r.right();
    int y2 = r.bottom();
    int w = s.width();
    int h = s.height();
    switch (rotation) {
    case QVFbView::Rot90:
        return QRect(
            QPoint(y1, w - x1),
            QPoint(y2, w - x2)).normalized();
    case QVFbView::Rot180:
        return QRect(
            QPoint(w - x1, h - y1),
            QPoint(w - x2, h - y2)).normalized();
    case QVFbView::Rot270:
        return QRect(
            QPoint(h - y1, x1),
            QPoint(h - y2, x2)).normalized();
    default:
        break;
    }
    return r;
}

static QRect mapFromDevice(const QRect &r, const QSize &s, QVFbView::Rotation rotation)
{
    return mapToDevice(r,s,QVFbView::Rotation(4-(int)rotation));
}

void QVFbView::sendMouseData(const QPoint &pos, int buttons, int wheel)
{
    QPoint p = mapToDevice(QRect(pos,QSize(1,1)), QSize(int(width()/hzm), int(height()/vzm)), rotation).topLeft();
    mView->sendMouseData(p, buttons, wheel);
}

void QVFbView::sendKeyboardData(QString unicode, int keycode, int modifiers,
				 bool press, bool repeat)
{
    mView->sendKeyboardData(unicode, keycode, modifiers, press, repeat);
}

void QVFbView::refreshDisplay(const QRect &r)
{
    if (animation) {
        if (r.isEmpty()) {
            animation->appendBlankFrame();
        } else {
            int l;
            QImage img = getBuffer(r, l);
            animation->appendFrame(img,QPoint(r.x(),r.y()));
        }
    }
    if (!r.isNull()) {
        if (hzm == 1.0 && vzm == 1.0) // hw: workaround for 4.3.1
            update(mapFromDevice(r, QSize(displayWidth(), displayHeight()), rotation));
        else
            update();
    }
}

static void dim(QRgb* rgb, int n, int brightness)
{
    uchar* b = (uchar*)rgb;
#if Q_BYTE_ORDER == Q_BIG_ENDIAN
    b++;
#endif
    while (n--) {
        b[0] = (uint)b[0] * brightness / 255;
        b[1] = (uint)b[1] * brightness / 255;
        b[2] = (uint)b[2] * brightness / 255;
        b += 4;
    }
}

QImage QVFbView::getBuffer(const QRect &r, int &leading) const
{
    const int brightness = mView->brightness();
    if ( brightness == 0 ) {
        QImage img(r.size(),QImage::Format_RGB32);
        img.fill(0);
        leading = 0;
        return img;
    }

    static QByteArray buffer;

    const int requiredSize = r.width() * r.height() * 4;

    QImage img;
    leading = 0;

    switch (viewdepth) {
    case 1: {
        if (requiredSize > buffer.size())
            buffer.resize(requiredSize);

        // XXX: hw: replace by drawhelper functionality

        const int pixelsPerByte = 8;
        quint8 *src = reinterpret_cast<quint8*>(mView->data())
                      + r.y() * mView->linestep() + r.x() / pixelsPerByte;
        const int align = qMin(r.width(), (8 - (r.x() & 7)) & 7);
        const int doAlign = (align > 0 ? 1 : 0);
        const int tail = qMin(r.width(), (r.width() - align) & 7);
        const int doTail = (tail > 0 ? 1 : 0);
        const int width8 = (r.width() - align) / pixelsPerByte;
        const int stride = mView->linestep() - (width8 + doAlign);

        uchar *b = reinterpret_cast<uchar*>(buffer.data());
	img = QImage(b, r.width(), r.height(), QImage::Format_RGB32);
	for (int y = 0; y < r.height(); ++y) {
            quint32 *dest = reinterpret_cast<quint32*>(img.scanLine(y));
            quint8 c;

            if (doAlign) {
                switch (align) {
                case 7: c = ((*src & 0x40) >> 6) * 0xff;
                        *dest++ = qRgb(c, c, c);
                case 6: c = ((*src & 0x20) >> 5) * 0xff;
                        *dest++ = qRgb(c, c, c);
                case 5: c = ((*src & 0x10) >> 4) * 0xff;
                        *dest++ = qRgb(c, c, c);
                case 4: c = ((*src & 0x08) >> 3) * 0xff;
                        *dest++ = qRgb(c, c, c);
                case 3: c = ((*src & 0x04) >> 2) * 0xff;
                        *dest++ = qRgb(c, c, c);
                case 2: c = ((*src & 0x02) >> 1) * 0xff;
                        *dest++ = qRgb(c, c, c);
                case 1: c = ((*src & 0x01)) * 0xff;