qscreenlinuxfb_qws.cpp

奇趣公司比较新的qt/emd版本

    \sa uncache(), clearCache(), deleteEntry()
*/

uchar * QLinuxFbScreen::cache(int amount)
{
    if(!canaccel || entryp==0) {
        return 0;
    }

    qt_fbdpy->grab();

    int startp = cacheStart + (*entryp+1) * sizeof(QPoolEntry);
    if (startp >= (int)*lowest) {
        // We don't have room for another cache QPoolEntry.
#ifdef DEBUG_CACHE
        qDebug("No room for pool entry in VRAM");
#endif
        qt_fbdpy->ungrab();
        return 0;
    }

    int align=pixmapOffsetAlignment();

    if (*entryp > 1) {
        // Try to find a gap in the allocated blocks.
        for (int loopc = 0; loopc < *entryp-1; loopc++) {
            int freestart = entries[loopc+1].end;
            int freeend = entries[loopc].start;
            if (freestart != freeend) {
                while (freestart % align) {
                    freestart++;
                }
                int len=freeend-freestart;
                if (len >= amount) {
                    insert_entry(loopc+1, freestart, freestart+amount);
                    qt_fbdpy->ungrab();
                    return data+freestart;
                }
            }
        }
    }

    // No free blocks in already-taken memory; get some more
    // if we can
    int newlowest = (*lowest)-amount;
    if (newlowest % align) {
        newlowest -= align;
        while (newlowest % align) {
            newlowest++;
        }
    }
    if (startp >= newlowest) {
        qt_fbdpy->ungrab();
#ifdef DEBUG_CACHE
        qDebug("No VRAM available for %d bytes", amount);
#endif
        return 0;
    }
    insert_entry(*entryp,newlowest,*lowest);
    qt_fbdpy->ungrab();
    return data+newlowest;
}

/*!
    \fn void QLinuxFbScreen::uncache(uchar * memoryBlock)

    Deletes the specified \a memoryBlock allocated from the graphics
    card memory.

    Note that the display is locked while memory is unallocated in
    order to preserve the memory pool's integrity.

    This 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. It is possible to speed up a driver by overriding this
    function to avoid syncing. For example, the driver might delay
    deleting the memory until it detects that all commands dealing
    with the memory are no longer in the queue. Note that it will then
    be up to the driver to ensure that the specified \a memoryBlock no
    longer is being used.

    \sa cache(), deleteEntry(), clearCache()
 */
void QLinuxFbScreen::uncache(uchar * c)
{
    // need to sync graphics card

    deleteEntry(c);
}

/*!
    \fn void QLinuxFbScreen::deleteEntry(uchar * memoryBlock)

    Deletes the specified \a memoryBlock allocated from the graphics
    card memory.

    \sa uncache(), cache(), clearCache()
*/
void QLinuxFbScreen::deleteEntry(uchar * c)
{
    qt_fbdpy->grab();
    unsigned long pos=(unsigned long)c;
    pos-=((unsigned long)data);
    unsigned int hold=(*entryp);
    for(unsigned int loopc=1;loopc<hold;loopc++) {
        if(entries[loopc].start==pos) {
            if (entries[loopc].clientId == qws_client_id)
                delete_entry(loopc);
            else
                qDebug("Attempt to delete client id %d cache entry", entries[loopc].clientId);
            qt_fbdpy->ungrab();
            return;
        }
    }
    qt_fbdpy->ungrab();
    qDebug("Attempt to delete unknown offset %ld",pos);
}

/*!
    Removes all entries from the cache for the specified screen \a
    instance and client identified by the given \a clientId.

    Calling this function should only be necessary if a client exits
    abnormally.

    \sa cache(), uncache(), deleteEntry()
*/
void QLinuxFbScreen::clearCache(QScreen *instance, int clientId)
{
    QLinuxFbScreen *screen = (QLinuxFbScreen *)instance;
    if (!screen->canaccel || !screen->entryp)
        return;
    qt_fbdpy->grab();
    for (int loopc = 0; loopc < *(screen->entryp); loopc++) {
        if (screen->entries[loopc].clientId == clientId) {
            screen->delete_entry(loopc);
            loopc--;
        }
    }
    qt_fbdpy->ungrab();
}


void QLinuxFbScreen::setupOffScreen()
{
    // Figure out position of offscreen memory
    // Set up pool entries pointer table and 64-bit align it
    int psize = size;
    psize += 4096;  // cursor data
    psize += 8;     // for alignment
    psize &= ~0x7;  // align

    unsigned long pos=(unsigned long)data;
    pos += psize;
    entryp = ((int *)pos);
    lowest = ((unsigned int *)pos)+1;
    pos += (sizeof(int))*4;
    entries = (QPoolEntry *)pos;

    // beginning of offscreen memory available for pixmaps.
    cacheStart = psize + sizeof(int)*4 + sizeof(QPoolEntry);
}

/*!
    \reimp

    This is called by the \l {Qtopia Core} server when it shuts down, and
    should be inherited if you need to do any card-specific cleanup.
    The default version hides the screen cursor and reenables the
    blinking cursor and screen blanking.
*/

void QLinuxFbScreen::shutdownDevice()
{
    // Causing crashes. Not needed.
    //setMode(startupw,startuph,startupd);
/*
    if (startupd == 8) {
        ioctl(fd,FBIOPUTCMAP,startcmap);
        free(startcmap->red);
        free(startcmap->green);
        free(startcmap->blue);
        free(startcmap->transp);
        delete startcmap;
        startcmap = 0;
    }
*/
    d_ptr->closeTty();
}

/*!
    \fn void QLinuxFbScreen::set(unsigned int index,unsigned int red,unsigned int green,unsigned int blue)

    Sets the specified color \a index to the specified RGB value, (\a
    red, \a green, \a blue), when in paletted graphics modes.
*/

void QLinuxFbScreen::set(unsigned int i,unsigned int r,unsigned int g,unsigned int b)
{
    if (d_ptr->fd != -1) {
        fb_cmap cmap;
        cmap.start=i;
        cmap.len=1;
        cmap.red=(unsigned short int *)
                 malloc(sizeof(unsigned short int)*256);
        cmap.green=(unsigned short int *)
                   malloc(sizeof(unsigned short int)*256);
        cmap.blue=(unsigned short int *)
                  malloc(sizeof(unsigned short int)*256);
        cmap.transp=(unsigned short int *)
                    malloc(sizeof(unsigned short int)*256);
        cmap.red[0]=r << 8;
        cmap.green[0]=g << 8;
        cmap.blue[0]=b << 8;
        cmap.transp[0]=0;
        ioctl(d_ptr->fd, FBIOPUTCMAP, &cmap);
        free(cmap.red);
        free(cmap.green);
        free(cmap.blue);
        free(cmap.transp);
    }
    screenclut[i] = qRgb(r, g, b);
}

/*!
    \reimp

    Sets the framebuffer to a new resolution and bit depth. The width is
    in \a nw, the height is in \a nh, and the depth is in \a nd. After
    doing this any currently-existing paint engines will be invalid and the
    screen should be completely redrawn. In a multiple-process
    Embedded Qt situation you must signal all other applications to
    call setMode() to the same mode and redraw.
*/

void QLinuxFbScreen::setMode(int nw,int nh,int nd)
{
    if (d_ptr->fd == -1)
        return;

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

    if (ioctl(d_ptr->fd, FBIOGET_VSCREENINFO, &vinfo)) {
        perror("QLinuxFbScreen::setMode");
        qFatal("Error reading variable information in mode change");
    }

    vinfo.xres=nw;
    vinfo.yres=nh;
    vinfo.bits_per_pixel=nd;

    if (ioctl(d_ptr->fd, FBIOPUT_VSCREENINFO, &vinfo)) {
        perror("QLinuxFbScreen::setMode");
        qCritical("Error writing variable information in mode change");
    }

    if (ioctl(d_ptr->fd, FBIOGET_VSCREENINFO, &vinfo)) {
        perror("QLinuxFbScreen::setMode");
        qFatal("Error reading changed variable information in mode change");
    }

    if (ioctl(d_ptr->fd, FBIOGET_FSCREENINFO, &finfo)) {
        perror("QLinuxFbScreen::setMode");
        qFatal("Error reading fixed information");
    }

    disconnect();
    connect(d_ptr->displaySpec);
    exposeRegion(region(), 0);
}

// save the state of the graphics card
// This is needed so that e.g. we can restore the palette when switching
// between linux virtual consoles.

/*!
    \reimp

    This doesn't do anything; accelerated drivers may wish to reimplement
    it to save graphics cards registers. It's called by the \l {Qtopia Core} server
    when the virtual console is switched.
*/

void QLinuxFbScreen::save()
{
    // nothing to do.
}


// restore the state of the graphics card.
/*!
    \reimp

    This is called when the virtual console is switched back to
    \l {Qtopia Core} and restores the palette.
*/
void QLinuxFbScreen::restore()
{
    if (d_ptr->fd == -1)
        return;

    if ((d == 8) || (d == 4)) {
        fb_cmap cmap;
        cmap.start=0;
        cmap.len=screencols;
        cmap.red=(unsigned short int *)
                 malloc(sizeof(unsigned short int)*256);
        cmap.green=(unsigned short int *)
                   malloc(sizeof(unsigned short int)*256);
        cmap.blue=(unsigned short int *)
                  malloc(sizeof(unsigned short int)*256);
        cmap.transp=(unsigned short int *)
                    malloc(sizeof(unsigned short int)*256);
        for (int loopc = 0; loopc < screencols; loopc++) {
            cmap.red[loopc] = qRed(screenclut[loopc]) << 8;
            cmap.green[loopc] = qGreen(screenclut[loopc]) << 8;
            cmap.blue[loopc] = qBlue(screenclut[loopc]) << 8;
            cmap.transp[loopc] = 0;
        }
        ioctl(d_ptr->fd, FBIOPUTCMAP, &cmap);
        free(cmap.red);
        free(cmap.green);
        free(cmap.blue);
        free(cmap.transp);
    }
}

/*!
    \fn int QLinuxFbScreen::sharedRamSize(void * end)
    \internal
*/

// This works like the QScreenCursor code. end points to the end
// of our shared structure, we return the amount of memory we reserved
int QLinuxFbScreen::sharedRamSize(void * end)
{
    shared=(QLinuxFb_Shared *)end;
    shared--;
    return sizeof(QLinuxFb_Shared);
}

/*!
    \reimp
*/
void QLinuxFbScreen::blank(bool on)
{
#if defined(QT_QWS_IPAQ)
    if (on)
        system("apm -suspend");
#else
    if (d_ptr->fd == -1)
        return;
// Some old kernel versions don't have this.  These defines should go
// away eventually
#if defined(FBIOBLANK)
#if defined(VESA_POWERDOWN) && defined(VESA_NO_BLANKING)
    ioctl(d_ptr->fd, FBIOBLANK, on ? VESA_POWERDOWN : VESA_NO_BLANKING);
#else
    ioctl(d_ptr->fd, FBIOBLANK, on ? 1 : 0);
#endif
#endif
#endif
}

void QLinuxFbScreen::setPixelFormat(struct fb_var_screeninfo info)
{
    const fb_bitfield rgba[4] = { info.red, info.green,
                                  info.blue, info.transp };

    QImage::Format format = QImage::Format_Invalid;


    // TODO: big endian

    switch (d) {
    case 32: {
        const fb_bitfield argb8888[4] = {{16, 8, 0}, {8, 8, 0},
                                         {0, 8, 0}, {24, 8, 0}};
        if (memcmp(rgba, argb8888, 4 * sizeof(fb_bitfield)) == 0)
            format = QImage::Format_ARGB32;
        else if (memcmp(rgba, argb8888, 3 * sizeof(fb_bitfield)) == 0)
            format = QImage::Format_RGB32;
        break;
    }
    case 16: {
        const fb_bitfield rgb565[4] = {{11, 5, 0}, {5, 6, 0},
                                       {0, 5, 0}, {0, 0, 0}};
        if (memcmp(rgba, rgb565, 3 * sizeof(fb_bitfield)) == 0)
            format = QImage::Format_RGB16;
        break;
    }
    case 8:
        break;
    case 1:
        format = QImage::Format_Mono; //###: LSB???
        break;
    default:
        break;
    }

    QScreen::setPixelFormat(format);
}

#endif // QT_NO_QWS_LINUXFB