qscreenlinuxfb_qws.cpp

奇趣公司比较新的qt/emd版本

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#include "qscreenlinuxfb_qws.h"

#ifndef QT_NO_QWS_LINUXFB
//#include "qmemorymanager_qws.h"
#include "qwsdisplay_qws.h"
#include "qpixmap.h"
#include <private/qwssignalhandler_p.h>

#include <unistd.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/kd.h>
#include <fcntl.h>
#include <errno.h>
#include <stdio.h>
#include <limits.h>
#include <signal.h>

#include <qdebug.h>

#include "qwindowsystem_qws.h"

#if !defined(Q_OS_DARWIN) && !defined(Q_OS_FREEBSD)
#include <linux/fb.h>

#ifdef __i386__
#include <asm/mtrr.h>
#endif
#endif

extern int qws_client_id;

//#define DEBUG_CACHE

class QLinuxFbScreenPrivate : public QObject
{
public:
    QLinuxFbScreenPrivate();
    ~QLinuxFbScreenPrivate();

    void openTty();
    void closeTty();

    int fd;
    int startupw;
    int startuph;
    int startupd;

    bool doGraphicsMode;
#ifdef QT_QWS_DEPTH_GENERIC
    bool doGenericColors;
#endif
    int ttyfd;
    long oldKdMode;
    QString ttyDevice;
    QString displaySpec;
};

QLinuxFbScreenPrivate::QLinuxFbScreenPrivate()
    : fd(-1), doGraphicsMode(true),
#ifdef QT_QWS_DEPTH_GENERIC
      doGenericColors(false),
#endif
      ttyfd(-1), oldKdMode(KD_TEXT)
{
    QWSSignalHandler::instance()->addObject(this);
}

QLinuxFbScreenPrivate::~QLinuxFbScreenPrivate()
{
    closeTty();
}

void QLinuxFbScreenPrivate::openTty()
{
    const char *const devs[] = {"/dev/tty0", "/dev/tty", "/dev/console", 0};

    if (ttyDevice.isEmpty()) {
        for (const char * const *dev = devs; *dev; ++dev) {
            ttyfd = ::open(*dev, O_RDWR);
            if (ttyfd != -1)
                break;
        }
    } else {
        ttyfd = ::open(ttyDevice.toAscii().constData(), O_RDWR);
    }

    if (ttyfd == -1)
        return;

    if (doGraphicsMode) {
        ioctl(ttyfd, KDGETMODE, &oldKdMode);
        if (oldKdMode != KD_GRAPHICS) {
            int ret = ioctl(ttyfd, KDSETMODE, KD_GRAPHICS);
            if (ret == -1)
                doGraphicsMode = false;
        }
    }
    if (!doGraphicsMode) {
        // No blankin' screen, no blinkin' cursor!, no cursor!
        const char termctl[] = "\033[9;0]\033[?33l\033[?25l\033[?1c";
        ::write(ttyfd, termctl, sizeof(termctl));
    }
}

void QLinuxFbScreenPrivate::closeTty()
{
    if (ttyfd == -1)
        return;

    if (doGraphicsMode) {
        ioctl(ttyfd, KDSETMODE, oldKdMode);
    } else {
        // Blankin' screen, blinkin' cursor!
        const char termctl[] = "\033[9;15]\033[?33h\033[?25h\033[?0c";
        ::write(ttyfd, termctl, sizeof(termctl));
    }

    ::close(ttyfd);
    ttyfd = -1;
}

/*!
    \internal

    \class QLinuxFbScreen
    \ingroup qws

    \brief The QLinuxFbScreen class implements a screen driver for the
    Linux framebuffer.

    Note that this class is only available in \l {Qtopia Core}.
    Custom screen drivers can be added by subclassing the
    QScreenDriverPlugin class, using the QScreenDriverFactory class to
    dynamically load the driver into the application, but there should
    only be one screen object per application.

    The QLinuxFbScreen class provides the cache() function allocating
    off-screen graphics memory, and the complementary uncache()
    function releasing the allocated memory. The latter function will
    first sync the graphics card to ensure the memory isn't still
    being used by a command in the graphics card FIFO queue. The
    deleteEntry() function deletes the given memory block without such
    synchronization.  Given the screen instance and client id, the
    memory can also be released using the clearCache() function, but
    this should only be necessary if a client exits abnormally.

    In addition, when in paletted graphics modes, the set() function
    provides the possibility of setting a specified color index to a
    given RGB value.

    The QLinuxFbScreen class also acts as a factory for the
    unaccelerated screen cursor and the unaccelerated raster-based
    implementation of QPaintEngine (\c QRasterPaintEngine);
    accelerated drivers for Linux should derive from this class.

    \sa QScreen, QScreenDriverPlugin, {Running Applications}
*/

/*!
    \fn bool QLinuxFbScreen::useOffscreen()
    \internal
*/

// Unaccelerated screen/driver setup. Can be overridden by accelerated
// drivers

/*!
    \fn QLinuxFbScreen::QLinuxFbScreen(int displayId)

    Constructs a QLinuxFbScreen object. The \a displayId argument
    identifies the Qtopia Core server to connect to.
*/

QLinuxFbScreen::QLinuxFbScreen(int display_id)
    : QScreen(display_id), d_ptr(new QLinuxFbScreenPrivate)
{
    canaccel=false;
    clearCacheFunc = &clearCache;
}

/*!
    Destroys this QLinuxFbScreen object.
*/

QLinuxFbScreen::~QLinuxFbScreen()
{
}

/*!
    \reimp

    This is called by \l {Qtopia Core} clients to map in the framebuffer.
    It should be reimplemented by accelerated drivers to map in
    graphics card registers; those drivers should then call this
    function in order to set up offscreen memory management. The
    device is specified in \a displaySpec, e.g. "/dev/fb".

    \sa disconnect()
*/

bool QLinuxFbScreen::connect(const QString &displaySpec)
{
    d_ptr->displaySpec = displaySpec;

    const QStringList args = displaySpec.split(QLatin1Char(':'));

    if (args.contains(QLatin1String("nographicsmodeswitch")))
        d_ptr->doGraphicsMode = false;

#ifdef QT_QWS_DEPTH_GENERIC
    if (args.contains(QLatin1String("genericcolors")))
        d_ptr->doGenericColors = true;
#endif

    QRegExp ttyRegExp(QLatin1String("tty=(.*)"));
    if (args.indexOf(ttyRegExp) != -1)
        d_ptr->ttyDevice = ttyRegExp.cap(1);

#if Q_BYTE_ORDER == Q_BIG_ENDIAN
#ifndef QT_QWS_FRAMEBUFFER_LITTLE_ENDIAN
    if (args.contains(QLatin1String("littleendian")))
#endif
        QScreen::setFrameBufferLittleEndian(true);
#endif

    // Check for explicitly specified device
    const int len = 8; // "/dev/fbx"
    int m = displaySpec.indexOf(QLatin1String("/dev/fb"));

    QString dev;
    if (m > 0)
        dev = displaySpec.mid(m, len);
    else
        dev = QLatin1String("/dev/fb0");

    if (access(dev.toLatin1().constData(), R_OK|W_OK) == 0)
        d_ptr->fd = open(dev.toLatin1().constData(), O_RDWR);
    if (d_ptr->fd == -1) {
        if (QApplication::type() == QApplication::GuiServer) {
            perror("QScreenLinuxFb::connect");
            qCritical("Error opening framebuffer device %s", qPrintable(dev));
            return false;
        }
        if (access(dev.toLatin1().constData(), R_OK) == 0)
            d_ptr->fd = open(dev.toLatin1().constData(), O_RDONLY);
    }

    fb_fix_screeninfo finfo;
    fb_var_screeninfo vinfo;
    //#######################
    // Shut up Valgrind
    memset(&vinfo, 0, sizeof(vinfo));
    memset(&finfo, 0, sizeof(finfo));
    //#######################

    /* Get fixed screen information */
    if (d_ptr->fd != -1 && ioctl(d_ptr->fd, FBIOGET_FSCREENINFO, &finfo)) {
        perror("QLinuxFbScreen::connect");
        qWarning("Error reading fixed information");
        return false;
    }

    /* Get variable screen information */
    if (d_ptr->fd != -1 && ioctl(d_ptr->fd, FBIOGET_VSCREENINFO, &vinfo)) {
        perror("QLinuxFbScreen::connect");
        qWarning("Error reading variable information");
        return false;
    }

    grayscale = vinfo.grayscale;
    d = vinfo.bits_per_pixel;
    if (d == 24)
        d = vinfo.red.length + vinfo.green.length + vinfo.blue.length;
    lstep=finfo.line_length;
    int xoff = vinfo.xoffset;
    int yoff = vinfo.yoffset;
    const char* qwssize;
    if((qwssize=::getenv("QWS_SIZE")) && sscanf(qwssize,"%dx%d",&w,&h)==2) {
        if (d_ptr->fd != -1) {
            if ((uint)w > vinfo.xres) w = vinfo.xres;
            if ((uint)h > vinfo.yres) h = vinfo.yres;
        }
        dw=w;
        dh=h;
        xoff += (vinfo.xres - w)/2;
        yoff += (vinfo.yres - h)/2;
    } else {
        dw=w=vinfo.xres;
        dh=h=vinfo.yres;
    }

    if (w == 0 || h == 0) {
        qWarning("QScreenLinuxFb::connect(): Unable to find screen geometry, "
                 "will use 320x240.");
        dw = w = 320;
        dh = h = 240;
    }

    setPixelFormat(vinfo);

    // Handle display physical size spec.
    QStringList displayArgs = displaySpec.split(QLatin1Char(':'));
    QRegExp mmWidthRx(QLatin1String("mmWidth=?(\\d+)"));
    int dimIdxW = displayArgs.indexOf(mmWidthRx);
    QRegExp mmHeightRx(QLatin1String("mmHeight=?(\\d+)"));
    int dimIdxH = displayArgs.indexOf(mmHeightRx);
    if (dimIdxW >= 0) {
        mmWidthRx.exactMatch(displayArgs.at(dimIdxW));
        physWidth = mmWidthRx.cap(1).toInt();
        if (dimIdxH < 0)
            physHeight = dh*physWidth/dw;
    }
    if (dimIdxH >= 0) {
        mmHeightRx.exactMatch(displayArgs.at(dimIdxH));
        physHeight = mmHeightRx.cap(1).toInt();
        if (dimIdxW < 0)
            physWidth = dw*physHeight/dh;
    }
    if (dimIdxW < 0 && dimIdxH < 0) {
        if (vinfo.width != 0 && vinfo.height != 0
            && vinfo.width != UINT_MAX && vinfo.height != UINT_MAX) {
            physWidth = vinfo.width;
            physHeight = vinfo.height;
        } else {
            const int dpi = 72;
            physWidth = qRound(dw * 25.4 / dpi);
            physHeight = qRound(dh * 25.4 / dpi);
        }
    }

    dataoffset = yoff * lstep + xoff * d / 8;
    //qDebug("Using %dx%dx%d screen",w,h,d);

    /* Figure out the size of the screen in bytes */
    size = h * lstep;

    //    qDebug("Framebuffer base at %lx",finfo.smem_start);
    //    qDebug("Registers base %lx",finfo.mmio_start);

    mapsize=finfo.smem_len;

    data = (unsigned char *)-1;
    if (d_ptr->fd != -1)
        data = (unsigned char *)mmap(0, mapsize, PROT_READ | PROT_WRITE,
                                     MAP_SHARED, d_ptr->fd, 0);

    if ((long)data == -1) {
        if (QApplication::type() == QApplication::GuiServer) {
            perror("QLinuxFbScreen::connect");
            qWarning("Error: failed to map framebuffer device to memory.");
            return false;
        }
        data = 0;
    } else {
        data += dataoffset;
    }

    canaccel=useOffscreen();

    if(mapsize-size<16384) {
        canaccel=false;
    }

    if(canaccel) {
        setupOffScreen();
    }

    // Now read in palette
    if((vinfo.bits_per_pixel==8) || (vinfo.bits_per_pixel==4)) {
        screencols= (vinfo.bits_per_pixel==8) ? 256 : 16;
        int loopc;
        fb_cmap startcmap;
        startcmap.start=0;
        startcmap.len=screencols;
        startcmap.red=(unsigned short int *)